drm/vc4: Add suport for 3D rendering using the V3D engine.

This is a squash of the out-of-tree development series.  Since that
series contained code from the first "get a demo triangle rendered
using a hacked up driver using binary shader code" to "plug the last
known security hole", it's hard to reconstruct a different series of
incremental development that's mergeable without security holes
throughout it.

Signed-off-by: Eric Anholt <eric@anholt.net>

drivers/gpu/drm/vc4/Makefile

@@ -8,10 +8,19 @@ vc4-y := \
 	vc4_crtc.o \
 	vc4_drv.o \
 	vc4_kms.o \
+	vc4_gem.o \
 	vc4_hdmi.o \
 	vc4_hvs.o \
-	vc4_plane.o
+	vc4_irq.o \
+	vc4_plane.o \
+	vc4_render_cl.o \
+	vc4_trace_points.o \
+	vc4_v3d.o \
+	vc4_validate.o \
+	vc4_validate_shaders.o
 
 vc4-$(CONFIG_DEBUG_FS) += vc4_debugfs.o
 
 obj-$(CONFIG_DRM_VC4)  += vc4.o
+
+CFLAGS_vc4_trace_points.o := -I$(src)

drivers/gpu/drm/vc4/vc4_bo.c

@@ -15,15 +15,173 @@
  */
 
 #include "vc4_drv.h"
+#include "uapi/drm/vc4_drm.h"
 
-struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t size)
+static void vc4_bo_stats_dump(struct vc4_dev *vc4)
 {
-	struct drm_gem_cma_object *cma_obj;
+	DRM_INFO("num bos allocated: %d\n",
+		 vc4->bo_stats.num_allocated);
+	DRM_INFO("size bos allocated: %dkb\n",
+		 vc4->bo_stats.size_allocated / 1024);
+	DRM_INFO("num bos used: %d\n",
+		 vc4->bo_stats.num_allocated - vc4->bo_stats.num_cached);
+	DRM_INFO("size bos used: %dkb\n",
+		 (vc4->bo_stats.size_allocated -
+		  vc4->bo_stats.size_cached) / 1024);
+	DRM_INFO("num bos cached: %d\n",
+		 vc4->bo_stats.num_cached);
+	DRM_INFO("size bos cached: %dkb\n",
+		 vc4->bo_stats.size_cached / 1024);
+}
 
-	cma_obj = drm_gem_cma_create(dev, size);
+static uint32_t bo_page_index(size_t size)
-	if (IS_ERR(cma_obj))
+{
+	return (size / PAGE_SIZE) - 1;
+}
+
+/* Must be called with bo_lock held. */
+static void vc4_bo_destroy(struct vc4_bo *bo)
+{
+	struct drm_gem_object *obj = &bo->base.base;
+	struct vc4_dev *vc4 = to_vc4_dev(obj->dev);
+
+	if (bo->validated_shader) {
+		kfree(bo->validated_shader->texture_samples);
+		kfree(bo->validated_shader);
+		bo->validated_shader = NULL;
+	}
+
+	vc4->bo_stats.num_allocated--;
+	vc4->bo_stats.size_allocated -= obj->size;
+	drm_gem_cma_free_object(obj);
+}
+
+/* Must be called with bo_lock held. */
+static void vc4_bo_remove_from_cache(struct vc4_bo *bo)
+{
+	struct drm_gem_object *obj = &bo->base.base;
+	struct vc4_dev *vc4 = to_vc4_dev(obj->dev);
+
+	vc4->bo_stats.num_cached--;
+	vc4->bo_stats.size_cached -= obj->size;
+
+	list_del(&bo->unref_head);
+	list_del(&bo->size_head);
+}
+
+static struct list_head *vc4_get_cache_list_for_size(struct drm_device *dev,
+						     size_t size)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	uint32_t page_index = bo_page_index(size);
+
+	if (vc4->bo_cache.size_list_size <= page_index) {
+		uint32_t new_size = max(vc4->bo_cache.size_list_size * 2,
+					page_index + 1);
+		struct list_head *new_list;
+		uint32_t i;
+
+		new_list = kmalloc(new_size * sizeof(struct list_head),
+				   GFP_KERNEL);
+		if (!new_list)
 			return NULL;
+
+		/* Rebase the old cached BO lists to their new list
+		 * head locations.
+		 */
+		for (i = 0; i < vc4->bo_cache.size_list_size; i++) {
+			struct list_head *old_list = &vc4->bo_cache.size_list[i];
+			if (list_empty(old_list))
+				INIT_LIST_HEAD(&new_list[i]);
 			else
+				list_replace(old_list, &new_list[i]);
+		}
+		/* And initialize the brand new BO list heads. */
+		for (i = vc4->bo_cache.size_list_size; i < new_size; i++)
+			INIT_LIST_HEAD(&new_list[i]);
+
+		kfree(vc4->bo_cache.size_list);
+		vc4->bo_cache.size_list = new_list;
+		vc4->bo_cache.size_list_size = new_size;
+	}
+
+	return &vc4->bo_cache.size_list[page_index];
+}
+
+void vc4_bo_cache_purge(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	spin_lock(&vc4->bo_lock);
+	while (!list_empty(&vc4->bo_cache.time_list)) {
+		struct vc4_bo *bo = list_last_entry(&vc4->bo_cache.time_list,
+						    struct vc4_bo, unref_head);
+		vc4_bo_remove_from_cache(bo);
+		vc4_bo_destroy(bo);
+	}
+	spin_unlock(&vc4->bo_lock);
+}
+
+struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t unaligned_size)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	uint32_t size = roundup(unaligned_size, PAGE_SIZE);
+	uint32_t page_index = bo_page_index(size);
+	struct drm_gem_cma_object *cma_obj;
+	int pass;
+
+	if (size == 0)
+		return NULL;
+
+	/* First, try to get a vc4_bo from the kernel BO cache. */
+	spin_lock(&vc4->bo_lock);
+	if (page_index < vc4->bo_cache.size_list_size &&
+	    !list_empty(&vc4->bo_cache.size_list[page_index])) {
+		struct vc4_bo *bo =
+			list_first_entry(&vc4->bo_cache.size_list[page_index],
+					 struct vc4_bo, size_head);
+		vc4_bo_remove_from_cache(bo);
+		spin_unlock(&vc4->bo_lock);
+		kref_init(&bo->base.base.refcount);
+		return bo;
+	}
+	spin_unlock(&vc4->bo_lock);
+
+	/* Otherwise, make a new BO. */
+	for (pass = 0; ; pass++) {
+		cma_obj = drm_gem_cma_create(dev, size);
+		if (!IS_ERR(cma_obj))
+			break;
+
+		switch (pass) {
+		case 0:
+			/*
+			 * If we've run out of CMA memory, kill the cache of
+			 * CMA allocations we've got laying around and try again.
+			 */
+			vc4_bo_cache_purge(dev);
+			break;
+		case 1:
+			/*
+			 * Getting desperate, so try to wait for any
+			 * previous rendering to finish, free its
+			 * unreferenced BOs to the cache, and then
+			 * free the cache.
+			 */
+			vc4_wait_for_seqno(dev, vc4->emit_seqno, ~0ull, true);
+			vc4_job_handle_completed(vc4);
+			vc4_bo_cache_purge(dev);
+			break;
+		case 3:
+			DRM_ERROR("Failed to allocate from CMA:\n");
+			vc4_bo_stats_dump(vc4);
+			return NULL;
+		}
+	}
+
+	vc4->bo_stats.num_allocated++;
+	vc4->bo_stats.size_allocated += size;
+
 	return to_vc4_bo(&cma_obj->base);
 }
 
@@ -41,7 +199,7 @@ int vc4_dumb_create(struct drm_file *file_priv,
 	if (args->size < args->pitch * args->height)
 		args->size = args->pitch * args->height;
 
-	bo = vc4_bo_create(dev, roundup(args->size, PAGE_SIZE));
+	bo = vc4_bo_create(dev, args->size);
 	if (!bo)
 		return -ENOMEM;
 
@@ -50,3 +208,309 @@ int vc4_dumb_create(struct drm_file *file_priv,
 
 	return ret;
 }
+
+static void
+vc4_bo_cache_free_old(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	unsigned long expire_time = jiffies - msecs_to_jiffies(1000);
+
+	spin_lock(&vc4->bo_lock);
+	while (!list_empty(&vc4->bo_cache.time_list)) {
+		struct vc4_bo *bo = list_last_entry(&vc4->bo_cache.time_list,
+						    struct vc4_bo, unref_head);
+		if (time_before(expire_time, bo->free_time)) {
+			mod_timer(&vc4->bo_cache.time_timer,
+				  round_jiffies_up(jiffies +
+						   msecs_to_jiffies(1000)));
+			spin_unlock(&vc4->bo_lock);
+			return;
+		}
+
+		vc4_bo_remove_from_cache(bo);
+		vc4_bo_destroy(bo);
+	}
+	spin_unlock(&vc4->bo_lock);
+}
+
+/* Called on the last userspace/kernel unreference of the BO.  Returns
+ * it to the BO cache if possible, otherwise frees it.
+ *
+ * Note that this is called with the struct_mutex held.
+ */
+void vc4_free_object(struct drm_gem_object *gem_bo)
+{
+	struct drm_device *dev = gem_bo->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	struct vc4_bo *bo = to_vc4_bo(gem_bo);
+	struct list_head *cache_list;
+
+	/* If the object references someone else's memory, we can't cache it.
+	 */
+	if (gem_bo->import_attach) {
+		vc4_bo_destroy(bo);
+		return;
+	}
+
+	/* Don't cache if it was publicly named. */
+	if (gem_bo->name) {
+		vc4_bo_destroy(bo);
+		return;
+	}
+
+	spin_lock(&vc4->bo_lock);
+	cache_list = vc4_get_cache_list_for_size(dev, gem_bo->size);
+	if (!cache_list) {
+		vc4_bo_destroy(bo);
+		spin_unlock(&vc4->bo_lock);
+		return;
+	}
+
+	if (bo->validated_shader) {
+		kfree(bo->validated_shader->texture_samples);
+		kfree(bo->validated_shader);
+		bo->validated_shader = NULL;
+	}
+
+	bo->free_time = jiffies;
+	list_add(&bo->size_head, cache_list);
+	list_add(&bo->unref_head, &vc4->bo_cache.time_list);
+
+	vc4->bo_stats.num_cached++;
+	vc4->bo_stats.size_cached += gem_bo->size;
+	spin_unlock(&vc4->bo_lock);
+
+	vc4_bo_cache_free_old(dev);
+}
+
+static void vc4_bo_cache_time_work(struct work_struct *work)
+{
+	struct vc4_dev *vc4 =
+		container_of(work, struct vc4_dev, bo_cache.time_work);
+	struct drm_device *dev = vc4->dev;
+
+	vc4_bo_cache_free_old(dev);
+}
+
+static void vc4_bo_cache_time_timer(unsigned long data)
+{
+	struct drm_device *dev = (struct drm_device *)data;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	schedule_work(&vc4->bo_cache.time_work);
+}
+
+struct dma_buf *
+vc4_prime_export(struct drm_device *dev, struct drm_gem_object *obj, int flags)
+{
+	struct vc4_bo *bo = to_vc4_bo(obj);
+
+	if (bo->validated_shader) {
+		DRM_ERROR("Attempting to export shader BO\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	return drm_gem_prime_export(dev, obj, flags);
+}
+
+int
+vc4_create_bo_ioctl(struct drm_device *dev, void *data,
+		    struct drm_file *file_priv)
+{
+	struct drm_vc4_create_bo *args = data;
+	struct vc4_bo *bo = NULL;
+	int ret;
+
+	bo = vc4_bo_create(dev, args->size);
+	if (!bo)
+		return -ENOMEM;
+
+	ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
+	drm_gem_object_unreference_unlocked(&bo->base.base);
+
+	return ret;
+}
+
+int
+vc4_create_shader_bo_ioctl(struct drm_device *dev, void *data,
+			   struct drm_file *file_priv)
+{
+	struct drm_vc4_create_shader_bo *args = data;
+	struct vc4_bo *bo = NULL;
+	int ret;
+
+	if (args->size == 0)
+		return -EINVAL;
+
+	if (args->size % sizeof(u64) != 0)
+		return -EINVAL;
+
+	if (args->flags != 0) {
+		DRM_INFO("Unknown flags set: 0x%08x\n", args->flags);
+		return -EINVAL;
+	}
+
+	if (args->pad != 0) {
+		DRM_INFO("Pad set: 0x%08x\n", args->pad);
+		return -EINVAL;
+	}
+
+	bo = vc4_bo_create(dev, args->size);
+	if (!bo)
+		return -ENOMEM;
+
+	ret = copy_from_user(bo->base.vaddr,
+			     (void __user *)(uintptr_t)args->data,
+			     args->size);
+	if (ret != 0)
+		goto fail;
+
+	bo->validated_shader = vc4_validate_shader(&bo->base);
+	if (!bo->validated_shader) {
+		ret = -EINVAL;
+		goto fail;
+	}
+
+	/* We have to create the handle after validation, to avoid
+	 * races for users to do doing things like mmap the shader BO.
+	 */
+	ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
+
+ fail:
+	drm_gem_object_unreference_unlocked(&bo->base.base);
+
+	return ret;
+}
+
+int
+vc4_mmap_bo_ioctl(struct drm_device *dev, void *data,
+		  struct drm_file *file_priv)
+{
+	struct drm_vc4_mmap_bo *args = data;
+	struct drm_gem_object *gem_obj;
+
+	gem_obj = drm_gem_object_lookup(dev, file_priv, args->handle);
+	if (!gem_obj) {
+		DRM_ERROR("Failed to look up GEM BO %d\n", args->handle);
+		return -EINVAL;
+	}
+
+	/* The mmap offset was set up at BO allocation time. */
+	args->offset = drm_vma_node_offset_addr(&gem_obj->vma_node);
+
+	drm_gem_object_unreference(gem_obj);
+	return 0;
+}
+
+int vc4_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+	struct drm_gem_object *gem_obj;
+	struct vc4_bo *bo;
+	int ret;
+
+	ret = drm_gem_mmap(filp, vma);
+	if (ret)
+		return ret;
+
+	gem_obj = vma->vm_private_data;
+	bo = to_vc4_bo(gem_obj);
+
+	if (bo->validated_shader) {
+		DRM_ERROR("mmaping of shader BOs not allowed.\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(), and set the
+	 * vm_pgoff (used as a fake buffer offset by DRM) to 0 as we want to map
+	 * the whole buffer.
+	 */
+	vma->vm_flags &= ~VM_PFNMAP;
+	vma->vm_pgoff = 0;
+
+	ret = dma_mmap_writecombine(bo->base.base.dev->dev, vma,
+				    bo->base.vaddr, bo->base.paddr,
+				    vma->vm_end - vma->vm_start);
+	if (ret)
+		drm_gem_vm_close(vma);
+
+	return ret;
+}
+
+int vc4_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
+{
+	struct vc4_bo *bo = to_vc4_bo(obj);
+
+	if (bo->validated_shader) {
+		DRM_ERROR("mmaping of shader BOs not allowed.\n");
+		return -EINVAL;
+	}
+
+	return drm_gem_cma_prime_mmap(obj, vma);
+}
+
+void *vc4_prime_vmap(struct drm_gem_object *obj)
+{
+	struct vc4_bo *bo = to_vc4_bo(obj);
+
+	if (bo->validated_shader) {
+		DRM_ERROR("mmaping of shader BOs not allowed.\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	return drm_gem_cma_prime_vmap(obj);
+}
+
+void vc4_bo_cache_init(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	spin_lock_init(&vc4->bo_lock);
+
+	INIT_LIST_HEAD(&vc4->bo_cache.time_list);
+
+	INIT_WORK(&vc4->bo_cache.time_work, vc4_bo_cache_time_work);
+	setup_timer(&vc4->bo_cache.time_timer,
+		    vc4_bo_cache_time_timer,
+		    (unsigned long) dev);
+}
+
+void vc4_bo_cache_destroy(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	del_timer(&vc4->bo_cache.time_timer);
+	cancel_work_sync(&vc4->bo_cache.time_work);
+
+	vc4_bo_cache_purge(dev);
+
+	if (vc4->bo_stats.num_allocated) {
+		DRM_ERROR("Destroying BO cache while BOs still allocated:\n");
+		vc4_bo_stats_dump(vc4);
+	}
+}
+
+#ifdef CONFIG_DEBUG_FS
+int vc4_bo_stats_debugfs(struct seq_file *m, void *unused)
+{
+	struct drm_info_node *node = (struct drm_info_node *) m->private;
+	struct drm_device *dev = node->minor->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	struct vc4_bo_stats stats;
+
+	spin_lock(&vc4->bo_lock);
+	stats = vc4->bo_stats;
+	spin_unlock(&vc4->bo_lock);
+
+	seq_printf(m, "num bos allocated: %d\n", stats.num_allocated);
+	seq_printf(m, "size bos allocated: %dkb\n", stats.size_allocated / 1024);
+	seq_printf(m, "num bos used: %d\n", (stats.num_allocated -
+					     stats.num_cached));
+	seq_printf(m, "size bos used: %dkb\n", (stats.size_allocated -
+						stats.size_cached) / 1024);
+	seq_printf(m, "num bos cached: %d\n", stats.num_cached);
+	seq_printf(m, "size bos cached: %dkb\n", stats.size_cached / 1024);
+
+	return 0;
+}
+#endif

drivers/gpu/drm/vc4/vc4_crtc.c

@@ -35,6 +35,7 @@
 #include "drm_atomic_helper.h"
 #include "drm_crtc_helper.h"
 #include "linux/clk.h"
+#include "drm_fb_cma_helper.h"
 #include "linux/component.h"
 #include "linux/of_device.h"
 #include "vc4_drv.h"
@@ -476,10 +477,105 @@ static irqreturn_t vc4_crtc_irq_handler(int irq, void *data)
 	return ret;
 }
 
+struct vc4_async_flip_state {
+	struct drm_crtc *crtc;
+	struct drm_framebuffer *fb;
+	struct drm_pending_vblank_event *event;
+
+	struct vc4_seqno_cb cb;
+};
+
+/* Called when the V3D execution for the BO being flipped to is done, so that
+ * we can actually update the plane's address to point to it.
+ */
+static void
+vc4_async_page_flip_complete(struct vc4_seqno_cb *cb)
+{
+	struct vc4_async_flip_state *flip_state =
+		container_of(cb, struct vc4_async_flip_state, cb);
+	struct drm_crtc *crtc = flip_state->crtc;
+	struct drm_device *dev = crtc->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	struct drm_plane *plane = crtc->primary;
+
+	vc4_plane_async_set_fb(plane, flip_state->fb);
+	if (flip_state->event) {
+		unsigned long flags;
+		spin_lock_irqsave(&dev->event_lock, flags);
+		drm_crtc_send_vblank_event(crtc, flip_state->event);
+		spin_unlock_irqrestore(&dev->event_lock, flags);
+	}
+
+	drm_framebuffer_unreference(flip_state->fb);
+	kfree(flip_state);
+
+	up(&vc4->async_modeset);
+}
+
+/* Implements async (non-vblank-synced) page flips.
+ *
+ * The page flip ioctl needs to return immediately, so we grab the
+ * modeset semaphore on the pipe, and queue the address update for
+ * when V3D is done with the BO being flipped to.
+ */
+static int vc4_async_page_flip(struct drm_crtc *crtc,
+			       struct drm_framebuffer *fb,
+			       struct drm_pending_vblank_event *event,
+			       uint32_t flags)
+{
+	struct drm_device *dev = crtc->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	struct drm_plane *plane = crtc->primary;
+	int ret = 0;
+	struct vc4_async_flip_state *flip_state;
+	struct drm_gem_cma_object *cma_bo = drm_fb_cma_get_gem_obj(fb, 0);
+	struct vc4_bo *bo = to_vc4_bo(&cma_bo->base);
+
+	flip_state = kzalloc(sizeof(*flip_state), GFP_KERNEL);
+	if (!flip_state)
+		return -ENOMEM;
+
+	drm_framebuffer_reference(fb);
+	flip_state->fb = fb;
+	flip_state->crtc = crtc;
+	flip_state->event = event;
+
+	/* Make sure all other async modesetes have landed. */
+	ret = down_interruptible(&vc4->async_modeset);
+	if (ret) {
+		kfree(flip_state);
+		return ret;
+	}
+
+	/* Immediately update the plane's legacy fb pointer, so that later
+	 * modeset prep sees the state that will be present when the semaphore
+	 * is released.
+	 */
+	drm_atomic_set_fb_for_plane(plane->state, fb);
+	plane->fb = fb;
+
+	vc4_queue_seqno_cb(dev, &flip_state->cb, bo->seqno,
+			   vc4_async_page_flip_complete);
+
+	/* Driver takes ownership of state on successful async commit. */
+	return 0;
+}
+
+static int vc4_page_flip(struct drm_crtc *crtc,
+		  struct drm_framebuffer *fb,
+		  struct drm_pending_vblank_event *event,
+		  uint32_t flags)
+{
+	if (flags & DRM_MODE_PAGE_FLIP_ASYNC)
+		return vc4_async_page_flip(crtc, fb, event, flags);
+	else
+		return drm_atomic_helper_page_flip(crtc, fb, event, flags);
+}
+
 static const struct drm_crtc_funcs vc4_crtc_funcs = {
 	.set_config = drm_atomic_helper_set_config,
 	.destroy = vc4_crtc_destroy,
-	.page_flip = drm_atomic_helper_page_flip,
+	.page_flip = vc4_page_flip,
 	.set_property = NULL,
 	.cursor_set = NULL, /* handled by drm_mode_cursor_universal */
 	.cursor_move = NULL, /* handled by drm_mode_cursor_universal */

drivers/gpu/drm/vc4/vc4_debugfs.c

@@ -16,11 +16,14 @@
 #include "vc4_regs.h"
 
 static const struct drm_info_list vc4_debugfs_list[] = {
+	{"bo_stats", vc4_bo_stats_debugfs, 0},
 	{"hdmi_regs", vc4_hdmi_debugfs_regs, 0},
 	{"hvs_regs", vc4_hvs_debugfs_regs, 0},
 	{"crtc0_regs", vc4_crtc_debugfs_regs, 0, (void *)(uintptr_t)0},
 	{"crtc1_regs", vc4_crtc_debugfs_regs, 0, (void *)(uintptr_t)1},
 	{"crtc2_regs", vc4_crtc_debugfs_regs, 0, (void *)(uintptr_t)2},
+	{"v3d_ident", vc4_v3d_debugfs_ident, 0},
+	{"v3d_regs", vc4_v3d_debugfs_regs, 0},
 };
 
 #define VC4_DEBUGFS_ENTRIES ARRAY_SIZE(vc4_debugfs_list)

drivers/gpu/drm/vc4/vc4_drv.c

@@ -14,8 +14,10 @@
 #include <linux/module.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
+#include <soc/bcm2835/raspberrypi-firmware.h>
 #include "drm_fb_cma_helper.h"
 
+#include "uapi/drm/vc4_drm.h"
 #include "vc4_drv.h"
 #include "vc4_regs.h"
 
@@ -63,7 +65,7 @@ static const struct file_operations vc4_drm_fops = {
 	.open = drm_open,
 	.release = drm_release,
 	.unlocked_ioctl = drm_ioctl,
-	.mmap = drm_gem_cma_mmap,
+	.mmap = vc4_mmap,
 	.poll = drm_poll,
 	.read = drm_read,
 #ifdef CONFIG_COMPAT
@@ -73,16 +75,28 @@ static const struct file_operations vc4_drm_fops = {
 };
 
 static const struct drm_ioctl_desc vc4_drm_ioctls[] = {
+	DRM_IOCTL_DEF_DRV(VC4_SUBMIT_CL, vc4_submit_cl_ioctl, 0),
+	DRM_IOCTL_DEF_DRV(VC4_WAIT_SEQNO, vc4_wait_seqno_ioctl, 0),
+	DRM_IOCTL_DEF_DRV(VC4_WAIT_BO, vc4_wait_bo_ioctl, 0),
+	DRM_IOCTL_DEF_DRV(VC4_CREATE_BO, vc4_create_bo_ioctl, 0),
+	DRM_IOCTL_DEF_DRV(VC4_MMAP_BO, vc4_mmap_bo_ioctl, 0),
+	DRM_IOCTL_DEF_DRV(VC4_CREATE_SHADER_BO, vc4_create_shader_bo_ioctl, 0),
 };
 
 static struct drm_driver vc4_drm_driver = {
 	.driver_features = (DRIVER_MODESET |
 			    DRIVER_ATOMIC |
 			    DRIVER_GEM |
+			    DRIVER_HAVE_IRQ |
 			    DRIVER_PRIME),
 	.lastclose = vc4_lastclose,
 	.preclose = vc4_drm_preclose,
 
+	.irq_handler = vc4_irq,
+	.irq_preinstall = vc4_irq_preinstall,
+	.irq_postinstall = vc4_irq_postinstall,
+	.irq_uninstall = vc4_irq_uninstall,
+
 	.enable_vblank = vc4_enable_vblank,
 	.disable_vblank = vc4_disable_vblank,
 	.get_vblank_counter = drm_vblank_count,
@@ -92,18 +106,18 @@ static struct drm_driver vc4_drm_driver = {
 	.debugfs_cleanup = vc4_debugfs_cleanup,
 #endif
 
-	.gem_free_object = drm_gem_cma_free_object,
+	.gem_free_object = vc4_free_object,
 	.gem_vm_ops = &drm_gem_cma_vm_ops,
 
 	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 	.gem_prime_import = drm_gem_prime_import,
-	.gem_prime_export = drm_gem_prime_export,
+	.gem_prime_export = vc4_prime_export,
 	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
 	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
-	.gem_prime_vmap = drm_gem_cma_prime_vmap,
+	.gem_prime_vmap = vc4_prime_vmap,
 	.gem_prime_vunmap = drm_gem_cma_prime_vunmap,
-	.gem_prime_mmap = drm_gem_cma_prime_mmap,
+	.gem_prime_mmap = vc4_prime_mmap,
 
 	.dumb_create = vc4_dumb_create,
 	.dumb_map_offset = drm_gem_cma_dumb_map_offset,
@@ -113,6 +127,8 @@ static struct drm_driver vc4_drm_driver = {
 	.num_ioctls = ARRAY_SIZE(vc4_drm_ioctls),
 	.fops = &vc4_drm_fops,
 
+	.gem_obj_size = sizeof(struct vc4_bo),
+
 	.name = DRIVER_NAME,
 	.desc = DRIVER_DESC,
 	.date = DRIVER_DATE,
@@ -153,6 +169,7 @@ static int vc4_drm_bind(struct device *dev)
 	struct drm_device *drm;
 	struct drm_connector *connector;
 	struct vc4_dev *vc4;
+	struct device_node *firmware_node;
 	int ret = 0;
 
 	dev->coherent_dma_mask = DMA_BIT_MASK(32);
@@ -161,6 +178,14 @@ static int vc4_drm_bind(struct device *dev)
 	if (!vc4)
 		return -ENOMEM;
 
+	firmware_node = of_parse_phandle(dev->of_node, "firmware", 0);
+	vc4->firmware = rpi_firmware_get(firmware_node);
+	if (!vc4->firmware) {
+		DRM_DEBUG("Failed to get Raspberry Pi firmware reference.\n");
+		return -EPROBE_DEFER;
+	}
+	of_node_put(firmware_node);
+
 	drm = drm_dev_alloc(&vc4_drm_driver, dev);
 	if (!drm)
 		return -ENOMEM;
@@ -170,13 +195,17 @@ static int vc4_drm_bind(struct device *dev)
 
 	drm_dev_set_unique(drm, dev_name(dev));
 
+	vc4_bo_cache_init(drm);
+
 	drm_mode_config_init(drm);
 	if (ret)
 		goto unref;
 
+	vc4_gem_init(drm);
+
 	ret = component_bind_all(dev, drm);
 	if (ret)
-		goto unref;
+		goto gem_destroy;
 
 	ret = drm_dev_register(drm, 0);
 	if (ret < 0)
@@ -200,8 +229,11 @@ unregister:
 	drm_dev_unregister(drm);
 unbind_all:
 	component_unbind_all(dev, drm);
+gem_destroy:
+	vc4_gem_destroy(drm);
 unref:
 	drm_dev_unref(drm);
+	vc4_bo_cache_destroy(drm);
 	return ret;
 }
 
@@ -228,6 +260,7 @@ static struct platform_driver *const component_drivers[] = {
 	&vc4_hdmi_driver,
 	&vc4_crtc_driver,
 	&vc4_hvs_driver,
+	&vc4_v3d_driver,
 };
 
 static int vc4_platform_drm_probe(struct platform_device *pdev)

drivers/gpu/drm/vc4/vc4_drv.h

@@ -15,8 +15,85 @@ struct vc4_dev {
 	struct vc4_hdmi *hdmi;
 	struct vc4_hvs *hvs;
 	struct vc4_crtc *crtc[3];
+	struct vc4_v3d *v3d;
 
 	struct drm_fbdev_cma *fbdev;
+	struct rpi_firmware *firmware;
+
+	/* The kernel-space BO cache.  Tracks buffers that have been
+	 * unreferenced by all other users (refcounts of 0!) but not
+	 * yet freed, so we can do cheap allocations.
+	 */
+	struct vc4_bo_cache {
+		/* Array of list heads for entries in the BO cache,
+		 * based on number of pages, so we can do O(1) lookups
+		 * in the cache when allocating.
+		 */
+		struct list_head *size_list;
+		uint32_t size_list_size;
+
+		/* List of all BOs in the cache, ordered by age, so we
+		 * can do O(1) lookups when trying to free old
+		 * buffers.
+		 */
+		struct list_head time_list;
+		struct work_struct time_work;
+		struct timer_list time_timer;
+	} bo_cache;
+
+	struct vc4_bo_stats {
+		u32 num_allocated;
+		u32 size_allocated;
+		u32 num_cached;
+		u32 size_cached;
+	} bo_stats;
+
+	/* Protects bo_cache and the BO stats. */
+	spinlock_t bo_lock;
+
+	/* Sequence number for the last job queued in job_list.
+	 * Starts at 0 (no jobs emitted).
+	 */
+	uint64_t emit_seqno;
+
+	/* Sequence number for the last completed job on the GPU.
+	 * Starts at 0 (no jobs completed).
+	 */
+	uint64_t finished_seqno;
+
+	/* List of all struct vc4_exec_info for jobs to be executed.
+	 * The first job in the list is the one currently programmed
+	 * into ct0ca/ct1ca for execution.
+	 */
+	struct list_head job_list;
+	/* List of the finished vc4_exec_infos waiting to be freed by
+	 * job_done_work.
+	 */
+	struct list_head job_done_list;
+	spinlock_t job_lock;
+	wait_queue_head_t job_wait_queue;
+	struct work_struct job_done_work;
+
+	/* List of struct vc4_seqno_cb for callbacks to be made from a
+	 * workqueue when the given seqno is passed.
+	 */
+	struct list_head seqno_cb_list;
+
+	/* The binner overflow memory that's currently set up in
+	 * BPOA/BPOS registers.  When overflow occurs and a new one is
+	 * allocated, the previous one will be moved to
+	 * vc4->current_exec's free list.
+	 */
+	struct vc4_bo *overflow_mem;
+	struct work_struct overflow_mem_work;
+
+	struct {
+		uint32_t last_ct0ca, last_ct1ca;
+		struct timer_list timer;
+		struct work_struct reset_work;
+	} hangcheck;
+
+	struct semaphore async_modeset;
 };
 
 static inline struct vc4_dev *
@@ -27,6 +104,25 @@ to_vc4_dev(struct drm_device *dev)
 
 struct vc4_bo {
 	struct drm_gem_cma_object base;
+
+	/* seqno of the last job to render to this BO. */
+	uint64_t seqno;
+
+	/* List entry for the BO's position in either
+	 * vc4_exec_info->unref_list or vc4_dev->bo_cache.time_list
+	 */
+	struct list_head unref_head;
+
+	/* Time in jiffies when the BO was put in vc4->bo_cache. */
+	unsigned long free_time;
+
+	/* List entry for the BO's position in vc4_dev->bo_cache.size_list */
+	struct list_head size_head;
+
+	/* Struct for shader validation state, if created by
+	 * DRM_IOCTL_VC4_CREATE_SHADER_BO.
+	 */
+	struct vc4_validated_shader_info *validated_shader;
 };
 
 static inline struct vc4_bo *
@@ -35,6 +131,17 @@ to_vc4_bo(struct drm_gem_object *bo)
 	return (struct vc4_bo *)bo;
 }
 
+struct vc4_seqno_cb {
+	struct work_struct work;
+	uint64_t seqno;
+	void (*func)(struct vc4_seqno_cb *cb);
+};
+
+struct vc4_v3d {
+	struct platform_device *pdev;
+	void __iomem *regs;
+};
+
 struct vc4_hvs {
 	struct platform_device *pdev;
 	void __iomem *regs;
@@ -72,9 +179,151 @@ to_vc4_encoder(struct drm_encoder *encoder)
 	return container_of(encoder, struct vc4_encoder, base);
 }
 
+#define V3D_READ(offset) readl(vc4->v3d->regs + offset)
+#define V3D_WRITE(offset, val) writel(val, vc4->v3d->regs + offset)
 #define HVS_READ(offset) readl(vc4->hvs->regs + offset)
 #define HVS_WRITE(offset, val) writel(val, vc4->hvs->regs + offset)
 
+enum vc4_bo_mode {
+	VC4_MODE_UNDECIDED,
+	VC4_MODE_RENDER,
+	VC4_MODE_SHADER,
+};
+
+struct vc4_bo_exec_state {
+	struct drm_gem_cma_object *bo;
+	enum vc4_bo_mode mode;
+};
+
+struct vc4_exec_info {
+	/* Sequence number for this bin/render job. */
+	uint64_t seqno;
+
+	/* Kernel-space copy of the ioctl arguments */
+	struct drm_vc4_submit_cl *args;
+
+	/* This is the array of BOs that were looked up at the start of exec.
+	 * Command validation will use indices into this array.
+	 */
+	struct vc4_bo_exec_state *bo;
+	uint32_t bo_count;
+
+	/* Pointers for our position in vc4->job_list */
+	struct list_head head;
+
+	/* List of other BOs used in the job that need to be released
+	 * once the job is complete.
+	 */
+	struct list_head unref_list;
+
+	/* Current unvalidated indices into @bo loaded by the non-hardware
+	 * VC4_PACKET_GEM_HANDLES.
+	 */
+	uint32_t bo_index[2];
+
+	/* This is the BO where we store the validated command lists, shader
+	 * records, and uniforms.
+	 */
+	struct drm_gem_cma_object *exec_bo;
+
+	/**
+	 * This tracks the per-shader-record state (packet 64) that
+	 * determines the length of the shader record and the offset
+	 * it's expected to be found at.  It gets read in from the
+	 * command lists.
+	 */
+	struct vc4_shader_state {
+		uint8_t packet;
+		uint32_t addr;
+		/* Maximum vertex index referenced by any primitive using this
+		 * shader state.
+		 */
+		uint32_t max_index;
+	} *shader_state;
+
+	/** How many shader states the user declared they were using. */
+	uint32_t shader_state_size;
+	/** How many shader state records the validator has seen. */
+	uint32_t shader_state_count;
+
+	bool found_tile_binning_mode_config_packet;
+	bool found_start_tile_binning_packet;
+	bool found_increment_semaphore_packet;
+	uint8_t bin_tiles_x, bin_tiles_y;
+	struct drm_gem_cma_object *tile_bo;
+	uint32_t tile_alloc_offset;
+
+	/**
+	 * Computed addresses pointing into exec_bo where we start the
+	 * bin thread (ct0) and render thread (ct1).
+	 */
+	uint32_t ct0ca, ct0ea;
+	uint32_t ct1ca, ct1ea;
+
+	/* Pointers to the shader recs.  These paddr gets incremented as CL
+	 * packets are relocated in validate_gl_shader_state, and the vaddrs
+	 * (u and v) get incremented and size decremented as the shader recs
+	 * themselves are validated.
+	 */
+	void *shader_rec_u;
+	void *shader_rec_v;
+	uint32_t shader_rec_p;
+	uint32_t shader_rec_size;
+
+	/* Pointers to the uniform data.  These pointers are incremented, and
+	 * size decremented, as each batch of uniforms is uploaded.
+	 */
+	void *uniforms_u;
+	void *uniforms_v;
+	uint32_t uniforms_p;
+	uint32_t uniforms_size;
+};
+
+static inline struct vc4_exec_info *
+vc4_first_job(struct vc4_dev *vc4)
+{
+	if (list_empty(&vc4->job_list))
+		return NULL;
+	return list_first_entry(&vc4->job_list, struct vc4_exec_info, head);
+}
+
+/**
+ * struct vc4_texture_sample_info - saves the offsets into the UBO for texture
+ * setup parameters.
+ *
+ * This will be used at draw time to relocate the reference to the texture
+ * contents in p0, and validate that the offset combined with
+ * width/height/stride/etc. from p1 and p2/p3 doesn't sample outside the BO.
+ * Note that the hardware treats unprovided config parameters as 0, so not all
+ * of them need to be set up for every texure sample, and we'll store ~0 as
+ * the offset to mark the unused ones.
+ *
+ * See the VC4 3D architecture guide page 41 ("Texture and Memory Lookup Unit
+ * Setup") for definitions of the texture parameters.
+ */
+struct vc4_texture_sample_info {
+	bool is_direct;
+	uint32_t p_offset[4];
+};
+
+/**
+ * struct vc4_validated_shader_info - information about validated shaders that
+ * needs to be used from command list validation.
+ *
+ * For a given shader, each time a shader state record references it, we need
+ * to verify that the shader doesn't read more uniforms than the shader state
+ * record's uniform BO pointer can provide, and we need to apply relocations
+ * and validate the shader state record's uniforms that define the texture
+ * samples.
+ */
+struct vc4_validated_shader_info
+{
+	uint32_t uniforms_size;
+	uint32_t uniforms_src_size;
+	uint32_t num_texture_samples;
+	struct vc4_texture_sample_info *texture_samples;
+};
+
 /**
  * _wait_for - magic (register) wait macro
  *
@@ -111,6 +360,18 @@ int vc4_dumb_create(struct drm_file *file_priv,
 		    struct drm_mode_create_dumb *args);
 struct dma_buf *vc4_prime_export(struct drm_device *dev,
 				 struct drm_gem_object *obj, int flags);
+int vc4_create_bo_ioctl(struct drm_device *dev, void *data,
+			struct drm_file *file_priv);
+int vc4_create_shader_bo_ioctl(struct drm_device *dev, void *data,
+			       struct drm_file *file_priv);
+int vc4_mmap_bo_ioctl(struct drm_device *dev, void *data,
+		      struct drm_file *file_priv);
+int vc4_mmap(struct file *filp, struct vm_area_struct *vma);
+int vc4_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma);
+void *vc4_prime_vmap(struct drm_gem_object *obj);
+void vc4_bo_cache_init(struct drm_device *dev);
+void vc4_bo_cache_destroy(struct drm_device *dev);
+int vc4_bo_stats_debugfs(struct seq_file *m, void *arg);
 
 /* vc4_crtc.c */
 extern struct platform_driver vc4_crtc_driver;
@@ -126,10 +387,34 @@ void vc4_debugfs_cleanup(struct drm_minor *minor);
 /* vc4_drv.c */
 void __iomem *vc4_ioremap_regs(struct platform_device *dev, int index);
 
+/* vc4_gem.c */
+void vc4_gem_init(struct drm_device *dev);
+void vc4_gem_destroy(struct drm_device *dev);
+int vc4_submit_cl_ioctl(struct drm_device *dev, void *data,
+			struct drm_file *file_priv);
+int vc4_wait_seqno_ioctl(struct drm_device *dev, void *data,
+			 struct drm_file *file_priv);
+int vc4_wait_bo_ioctl(struct drm_device *dev, void *data,
+		      struct drm_file *file_priv);
+void vc4_submit_next_job(struct drm_device *dev);
+int vc4_wait_for_seqno(struct drm_device *dev, uint64_t seqno,
+		       uint64_t timeout_ns, bool interruptible);
+void vc4_job_handle_completed(struct vc4_dev *vc4);
+int vc4_queue_seqno_cb(struct drm_device *dev,
+		       struct vc4_seqno_cb *cb, uint64_t seqno,
+		       void (*func)(struct vc4_seqno_cb *cb));
+
 /* vc4_hdmi.c */
 extern struct platform_driver vc4_hdmi_driver;
 int vc4_hdmi_debugfs_regs(struct seq_file *m, void *unused);
 
+/* vc4_irq.c */
+irqreturn_t vc4_irq(int irq, void *arg);
+void vc4_irq_preinstall(struct drm_device *dev);
+int vc4_irq_postinstall(struct drm_device *dev);
+void vc4_irq_uninstall(struct drm_device *dev);
+void vc4_irq_reset(struct drm_device *dev);
+
 /* vc4_hvs.c */
 extern struct platform_driver vc4_hvs_driver;
 void vc4_hvs_dump_state(struct drm_device *dev);
@@ -143,3 +428,35 @@ struct drm_plane *vc4_plane_init(struct drm_device *dev,
 				 enum drm_plane_type type);
 u32 vc4_plane_write_dlist(struct drm_plane *plane, u32 __iomem *dlist);
 u32 vc4_plane_dlist_size(struct drm_plane_state *state);
+void vc4_plane_async_set_fb(struct drm_plane *plane, struct drm_framebuffer *fb);
+
+/* vc4_v3d.c */
+extern struct platform_driver vc4_v3d_driver;
+int vc4_v3d_debugfs_ident(struct seq_file *m, void *unused);
+int vc4_v3d_debugfs_regs(struct seq_file *m, void *unused);
+int vc4_v3d_set_power(struct vc4_dev *vc4, bool on);
+
+/* vc4_validate.c */
+int
+vc4_validate_bin_cl(struct drm_device *dev,
+		    void *validated,
+		    void *unvalidated,
+		    struct vc4_exec_info *exec);
+
+int
+vc4_validate_shader_recs(struct drm_device *dev, struct vc4_exec_info *exec);
+
+struct vc4_validated_shader_info *
+vc4_validate_shader(struct drm_gem_cma_object *shader_obj);
+
+bool vc4_use_bo(struct vc4_exec_info *exec,
+		uint32_t hindex,
+		enum vc4_bo_mode mode,
+		struct drm_gem_cma_object **obj);
+
+int vc4_get_rcl(struct drm_device *dev, struct vc4_exec_info *exec);
+
+bool vc4_check_tex_size(struct vc4_exec_info *exec,
+			struct drm_gem_cma_object *fbo,
+			uint32_t offset, uint8_t tiling_format,
+			uint32_t width, uint32_t height, uint8_t cpp);

drivers/gpu/drm/vc4/vc4_gem.c

@@ -0,0 +1,686 @@
+/*
+ * Copyright © 2014 Broadcom
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/device.h>
+#include <linux/io.h>
+
+#include "uapi/drm/vc4_drm.h"
+#include "vc4_drv.h"
+#include "vc4_regs.h"
+#include "vc4_trace.h"
+
+static void
+vc4_queue_hangcheck(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	mod_timer(&vc4->hangcheck.timer,
+		  round_jiffies_up(jiffies + msecs_to_jiffies(100)));
+}
+
+static void
+vc4_reset(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	DRM_INFO("Resetting GPU.\n");
+	vc4_v3d_set_power(vc4, false);
+	vc4_v3d_set_power(vc4, true);
+
+	vc4_irq_reset(dev);
+
+	/* Rearm the hangcheck -- another job might have been waiting
+	 * for our hung one to get kicked off, and vc4_irq_reset()
+	 * would have started it.
+	 */
+	vc4_queue_hangcheck(dev);
+}
+
+static void
+vc4_reset_work(struct work_struct *work)
+{
+	struct vc4_dev *vc4 =
+		container_of(work, struct vc4_dev, hangcheck.reset_work);
+
+	vc4_reset(vc4->dev);
+}
+
+static void
+vc4_hangcheck_elapsed(unsigned long data)
+{
+	struct drm_device *dev = (struct drm_device *)data;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	uint32_t ct0ca, ct1ca;
+
+	/* If idle, we can stop watching for hangs. */
+	if (list_empty(&vc4->job_list))
+		return;
+
+	ct0ca = V3D_READ(V3D_CTNCA(0));
+	ct1ca = V3D_READ(V3D_CTNCA(1));
+
+	/* If we've made any progress in execution, rearm the timer
+	 * and wait.
+	 */
+	if (ct0ca != vc4->hangcheck.last_ct0ca ||
+	    ct1ca != vc4->hangcheck.last_ct1ca) {
+		vc4->hangcheck.last_ct0ca = ct0ca;
+		vc4->hangcheck.last_ct1ca = ct1ca;
+		vc4_queue_hangcheck(dev);
+		return;
+	}
+
+	/* We've gone too long with no progress, reset.  This has to
+	 * be done from a work struct, since resetting can sleep and
+	 * this timer hook isn't allowed to.
+	 */
+	schedule_work(&vc4->hangcheck.reset_work);
+}
+
+static void
+submit_cl(struct drm_device *dev, uint32_t thread, uint32_t start, uint32_t end)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	/* Stop any existing thread and set state to "stopped at halt" */
+	V3D_WRITE(V3D_CTNCS(thread), V3D_CTRUN);
+	barrier();
+
+	V3D_WRITE(V3D_CTNCA(thread), start);
+	barrier();
+
+	/* Set the end address of the control list.  Writing this
+	 * register is what starts the job.
+	 */
+	V3D_WRITE(V3D_CTNEA(thread), end);
+	barrier();
+}
+
+int
+vc4_wait_for_seqno(struct drm_device *dev, uint64_t seqno, uint64_t timeout_ns,
+		   bool interruptible)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	int ret = 0;
+	unsigned long timeout_expire;
+	DEFINE_WAIT(wait);
+
+	if (vc4->finished_seqno >= seqno)
+		return 0;
+
+	if (timeout_ns == 0)
+		return -ETIME;
+
+	timeout_expire = jiffies + nsecs_to_jiffies(timeout_ns);
+
+	trace_vc4_wait_for_seqno_begin(dev, seqno, timeout_ns);
+	for (;;) {
+		prepare_to_wait(&vc4->job_wait_queue, &wait,
+				interruptible ? TASK_INTERRUPTIBLE :
+				TASK_UNINTERRUPTIBLE);
+
+		if (interruptible && signal_pending(current)) {
+			ret = -ERESTARTSYS;
+			break;
+		}
+
+		if (vc4->finished_seqno >= seqno)
+			break;
+
+		if (timeout_ns != ~0ull) {
+			if (time_after_eq(jiffies, timeout_expire)) {
+				ret = -ETIME;
+				break;
+			}
+			schedule_timeout(timeout_expire - jiffies);
+		} else {
+			schedule();
+		}
+	}
+
+	finish_wait(&vc4->job_wait_queue, &wait);
+	trace_vc4_wait_for_seqno_end(dev, seqno);
+
+	if (ret && ret != -ERESTARTSYS) {
+		DRM_ERROR("timeout waiting for render thread idle\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static void
+vc4_flush_caches(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	/* Flush the GPU L2 caches.  These caches sit on top of system
+	 * L3 (the 128kb or so shared with the CPU), and are
+	 * non-allocating in the L3.
+	 */
+	V3D_WRITE(V3D_L2CACTL,
+		  V3D_L2CACTL_L2CCLR);
+
+	V3D_WRITE(V3D_SLCACTL,
+		  VC4_SET_FIELD(0xf, V3D_SLCACTL_T1CC) |
+		  VC4_SET_FIELD(0xf, V3D_SLCACTL_T0CC) |
+		  VC4_SET_FIELD(0xf, V3D_SLCACTL_UCC) |
+		  VC4_SET_FIELD(0xf, V3D_SLCACTL_ICC));
+}
+
+/* Sets the registers for the next job to be actually be executed in
+ * the hardware.
+ *
+ * The job_lock should be held during this.
+ */
+void
+vc4_submit_next_job(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	struct vc4_exec_info *exec = vc4_first_job(vc4);
+
+	if (!exec)
+		return;
+
+	vc4_flush_caches(dev);
+
+	/* Disable the binner's pre-loaded overflow memory address */
+	V3D_WRITE(V3D_BPOA, 0);
+	V3D_WRITE(V3D_BPOS, 0);
+
+	if (exec->ct0ca != exec->ct0ea)
+		submit_cl(dev, 0, exec->ct0ca, exec->ct0ea);
+	submit_cl(dev, 1, exec->ct1ca, exec->ct1ea);
+}
+
+static void
+vc4_update_bo_seqnos(struct vc4_exec_info *exec, uint64_t seqno)
+{
+	struct vc4_bo *bo;
+	unsigned i;
+
+	for (i = 0; i < exec->bo_count; i++) {
+		bo = to_vc4_bo(&exec->bo[i].bo->base);
+		bo->seqno = seqno;
+	}
+
+	list_for_each_entry(bo, &exec->unref_list, unref_head) {
+		bo->seqno = seqno;
+	}
+}
+
+/* Queues a struct vc4_exec_info for execution.  If no job is
+ * currently executing, then submits it.
+ *
+ * Unlike most GPUs, our hardware only handles one command list at a
+ * time.  To queue multiple jobs at once, we'd need to edit the
+ * previous command list to have a jump to the new one at the end, and
+ * then bump the end address.  That's a change for a later date,
+ * though.
+ */
+static void
+vc4_queue_submit(struct drm_device *dev, struct vc4_exec_info *exec)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	uint64_t seqno = ++vc4->emit_seqno;
+	unsigned long irqflags;
+
+	exec->seqno = seqno;
+	vc4_update_bo_seqnos(exec, seqno);
+
+	spin_lock_irqsave(&vc4->job_lock, irqflags);
+	list_add_tail(&exec->head, &vc4->job_list);
+
+	/* If no job was executing, kick ours off.  Otherwise, it'll
+	 * get started when the previous job's frame done interrupt
+	 * occurs.
+	 */
+	if (vc4_first_job(vc4) == exec) {
+		vc4_submit_next_job(dev);
+		vc4_queue_hangcheck(dev);
+	}
+
+	spin_unlock_irqrestore(&vc4->job_lock, irqflags);
+}
+
+/**
+ * Looks up a bunch of GEM handles for BOs and stores the array for
+ * use in the command validator that actually writes relocated
+ * addresses pointing to them.
+ */
+static int
+vc4_cl_lookup_bos(struct drm_device *dev,
+		  struct drm_file *file_priv,
+		  struct vc4_exec_info *exec)
+{
+	struct drm_vc4_submit_cl *args = exec->args;
+	uint32_t *handles;
+	int ret = 0;
+	int i;
+
+	exec->bo_count = args->bo_handle_count;
+
+	if (!exec->bo_count) {
+		/* See comment on bo_index for why we have to check
+		 * this.
+		 */
+		DRM_ERROR("Rendering requires BOs to validate\n");
+		return -EINVAL;
+	}
+
+	exec->bo = kcalloc(exec->bo_count, sizeof(struct vc4_bo_exec_state),
+			   GFP_KERNEL);
+	if (!exec->bo) {
+		DRM_ERROR("Failed to allocate validated BO pointers\n");
+		return -ENOMEM;
+	}
+
+	handles = drm_malloc_ab(exec->bo_count, sizeof(uint32_t));
+	if (!handles) {
+		DRM_ERROR("Failed to allocate incoming GEM handles\n");
+		goto fail;
+	}
+
+	ret = copy_from_user(handles,
+			     (void __user *)(uintptr_t)args->bo_handles,
+			     exec->bo_count * sizeof(uint32_t));
+	if (ret) {
+		DRM_ERROR("Failed to copy in GEM handles\n");
+		goto fail;
+	}
+
+	spin_lock(&file_priv->table_lock);
+	for (i = 0; i < exec->bo_count; i++) {
+		struct drm_gem_object *bo = idr_find(&file_priv->object_idr,
+						     handles[i]);
+		if (!bo) {
+			DRM_ERROR("Failed to look up GEM BO %d: %d\n",
+				  i, handles[i]);
+			ret = -EINVAL;
+			spin_unlock(&file_priv->table_lock);
+			goto fail;
+		}
+		drm_gem_object_reference(bo);
+		exec->bo[i].bo = (struct drm_gem_cma_object *)bo;
+	}
+	spin_unlock(&file_priv->table_lock);
+
+fail:
+	kfree(handles);
+	return 0;
+}
+
+static int
+vc4_get_bcl(struct drm_device *dev, struct vc4_exec_info *exec)
+{
+	struct drm_vc4_submit_cl *args = exec->args;
+	void *temp = NULL;
+	void *bin;
+	int ret = 0;
+	uint32_t bin_offset = 0;
+	uint32_t shader_rec_offset = roundup(bin_offset + args->bin_cl_size,
+					     16);
+	uint32_t uniforms_offset = shader_rec_offset + args->shader_rec_size;
+	uint32_t exec_size = uniforms_offset + args->uniforms_size;
+	uint32_t temp_size = exec_size + (sizeof(struct vc4_shader_state) *
+					  args->shader_rec_count);
+	struct vc4_bo *bo;
+
+	if (uniforms_offset < shader_rec_offset ||
+	    exec_size < uniforms_offset ||
+	    args->shader_rec_count >= (UINT_MAX /
+					  sizeof(struct vc4_shader_state)) ||
+	    temp_size < exec_size) {
+		DRM_ERROR("overflow in exec arguments\n");
+		goto fail;
+	}
+
+	/* Allocate space where we'll store the copied in user command lists
+	 * and shader records.
+	 *
+	 * We don't just copy directly into the BOs because we need to
+	 * read the contents back for validation, and I think the
+	 * bo->vaddr is uncached access.
+	 */
+	temp = kmalloc(temp_size, GFP_KERNEL);
+	if (!temp) {
+		DRM_ERROR("Failed to allocate storage for copying "
+			  "in bin/render CLs.\n");
+		ret = -ENOMEM;
+		goto fail;
+	}
+	bin = temp + bin_offset;
+	exec->shader_rec_u = temp + shader_rec_offset;
+	exec->uniforms_u = temp + uniforms_offset;
+	exec->shader_state = temp + exec_size;
+	exec->shader_state_size = args->shader_rec_count;
+
+	ret = copy_from_user(bin,
+			     (void __user *)(uintptr_t)args->bin_cl,
+			     args->bin_cl_size);
+	if (ret) {
+		DRM_ERROR("Failed to copy in bin cl\n");
+		goto fail;
+	}
+
+	ret = copy_from_user(exec->shader_rec_u,
+			     (void __user *)(uintptr_t)args->shader_rec,
+			     args->shader_rec_size);
+	if (ret) {
+		DRM_ERROR("Failed to copy in shader recs\n");
+		goto fail;
+	}
+
+	ret = copy_from_user(exec->uniforms_u,
+			     (void __user *)(uintptr_t)args->uniforms,
+			     args->uniforms_size);
+	if (ret) {
+		DRM_ERROR("Failed to copy in uniforms cl\n");
+		goto fail;
+	}
+
+	bo = vc4_bo_create(dev, exec_size);
+	if (!bo) {
+		DRM_ERROR("Couldn't allocate BO for binning\n");
+		ret = PTR_ERR(exec->exec_bo);
+		goto fail;
+	}
+	exec->exec_bo = &bo->base;
+
+	list_add_tail(&to_vc4_bo(&exec->exec_bo->base)->unref_head,
+		      &exec->unref_list);
+
+	exec->ct0ca = exec->exec_bo->paddr + bin_offset;
+
+	exec->shader_rec_v = exec->exec_bo->vaddr + shader_rec_offset;
+	exec->shader_rec_p = exec->exec_bo->paddr + shader_rec_offset;
+	exec->shader_rec_size = args->shader_rec_size;
+
+	exec->uniforms_v = exec->exec_bo->vaddr + uniforms_offset;
+	exec->uniforms_p = exec->exec_bo->paddr + uniforms_offset;
+	exec->uniforms_size = args->uniforms_size;
+
+	ret = vc4_validate_bin_cl(dev,
+				  exec->exec_bo->vaddr + bin_offset,
+				  bin,
+				  exec);
+	if (ret)
+		goto fail;
+
+	ret = vc4_validate_shader_recs(dev, exec);
+
+fail:
+	kfree(temp);
+	return ret;
+}
+
+static void
+vc4_complete_exec(struct vc4_exec_info *exec)
+{
+	unsigned i;
+
+	if (exec->bo) {
+		for (i = 0; i < exec->bo_count; i++)
+			drm_gem_object_unreference(&exec->bo[i].bo->base);
+		kfree(exec->bo);
+	}
+
+	while (!list_empty(&exec->unref_list)) {
+		struct vc4_bo *bo = list_first_entry(&exec->unref_list,
+						     struct vc4_bo, unref_head);
+		list_del(&bo->unref_head);
+		drm_gem_object_unreference(&bo->base.base);
+	}
+
+	kfree(exec);
+}
+
+void
+vc4_job_handle_completed(struct vc4_dev *vc4)
+{
+	unsigned long irqflags;
+	struct vc4_seqno_cb *cb, *cb_temp;
+
+	spin_lock_irqsave(&vc4->job_lock, irqflags);
+	while (!list_empty(&vc4->job_done_list)) {
+		struct vc4_exec_info *exec =
+			list_first_entry(&vc4->job_done_list,
+					 struct vc4_exec_info, head);
+		list_del(&exec->head);
+
+		spin_unlock_irqrestore(&vc4->job_lock, irqflags);
+		vc4_complete_exec(exec);
+		spin_lock_irqsave(&vc4->job_lock, irqflags);
+	}
+	spin_unlock_irqrestore(&vc4->job_lock, irqflags);
+
+	list_for_each_entry_safe(cb, cb_temp, &vc4->seqno_cb_list, work.entry) {
+		if (cb->seqno <= vc4->finished_seqno) {
+			list_del_init(&cb->work.entry);
+			schedule_work(&cb->work);
+		}
+	}
+}
+
+static void vc4_seqno_cb_work(struct work_struct *work)
+{
+	struct vc4_seqno_cb *cb = container_of(work, struct vc4_seqno_cb, work);
+	cb->func(cb);
+}
+
+int vc4_queue_seqno_cb(struct drm_device *dev,
+		       struct vc4_seqno_cb *cb, uint64_t seqno,
+		       void (*func)(struct vc4_seqno_cb *cb))
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	int ret = 0;
+
+	cb->func = func;
+	INIT_WORK(&cb->work, vc4_seqno_cb_work);
+
+	mutex_lock(&dev->struct_mutex);
+	if (seqno > vc4->finished_seqno) {
+		cb->seqno = seqno;
+		list_add_tail(&cb->work.entry, &vc4->seqno_cb_list);
+	} else {
+		schedule_work(&cb->work);
+	}
+	mutex_unlock(&dev->struct_mutex);
+
+	return ret;
+}
+
+/* Scheduled when any job has been completed, this walks the list of
+ * jobs that had completed and unrefs their BOs and frees their exec
+ * structs.
+ */
+static void
+vc4_job_done_work(struct work_struct *work)
+{
+	struct vc4_dev *vc4 =
+		container_of(work, struct vc4_dev, job_done_work);
+	struct drm_device *dev = vc4->dev;
+
+	/* Need the struct lock for drm_gem_object_unreference(). */
+	mutex_lock(&dev->struct_mutex);
+	vc4_job_handle_completed(vc4);
+	mutex_unlock(&dev->struct_mutex);
+}
+
+static int
+vc4_wait_for_seqno_ioctl_helper(struct drm_device *dev,
+				uint64_t seqno,
+				uint64_t *timeout_ns)
+{
+	unsigned long start = jiffies;
+	int ret = vc4_wait_for_seqno(dev, seqno, *timeout_ns, true);
+
+	if ((ret == -EINTR || ret == -ERESTARTSYS) && *timeout_ns != ~0ull) {
+		uint64_t delta = jiffies_to_nsecs(jiffies - start);
+		if (*timeout_ns >= delta)
+			*timeout_ns -= delta;
+	}
+
+	return ret;
+}
+
+int
+vc4_wait_seqno_ioctl(struct drm_device *dev, void *data,
+		     struct drm_file *file_priv)
+{
+	struct drm_vc4_wait_seqno *args = data;
+
+	return vc4_wait_for_seqno_ioctl_helper(dev, args->seqno,
+					       &args->timeout_ns);
+}
+
+int
+vc4_wait_bo_ioctl(struct drm_device *dev, void *data,
+		  struct drm_file *file_priv)
+{
+	int ret;
+	struct drm_vc4_wait_bo *args = data;
+	struct drm_gem_object *gem_obj;
+	struct vc4_bo *bo;
+
+	gem_obj = drm_gem_object_lookup(dev, file_priv, args->handle);
+	if (!gem_obj) {
+		DRM_ERROR("Failed to look up GEM BO %d\n", args->handle);
+		return -EINVAL;
+	}
+	bo = to_vc4_bo(gem_obj);
+
+	ret = vc4_wait_for_seqno_ioctl_helper(dev, bo->seqno, &args->timeout_ns);
+
+	drm_gem_object_unreference(gem_obj);
+	return ret;
+}
+
+/**
+ * Submits a command list to the VC4.
+ *
+ * This is what is called batchbuffer emitting on other hardware.
+ */
+int
+vc4_submit_cl_ioctl(struct drm_device *dev, void *data,
+		    struct drm_file *file_priv)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	struct drm_vc4_submit_cl *args = data;
+	struct vc4_exec_info *exec;
+	int ret;
+
+	if ((args->flags & ~VC4_SUBMIT_CL_USE_CLEAR_COLOR) != 0) {
+		DRM_ERROR("Unknown flags: 0x%02x\n", args->flags);
+		return -EINVAL;
+	}
+
+	exec = kcalloc(1, sizeof(*exec), GFP_KERNEL);
+	if (!exec) {
+		DRM_ERROR("malloc failure on exec struct\n");
+		return -ENOMEM;
+	}
+
+	exec->args = args;
+	INIT_LIST_HEAD(&exec->unref_list);
+
+	mutex_lock(&dev->struct_mutex);
+
+	ret = vc4_cl_lookup_bos(dev, file_priv, exec);
+	if (ret)
+		goto fail;
+
+	if (exec->args->bin_cl_size != 0) {
+		ret = vc4_get_bcl(dev, exec);
+		if (ret)
+			goto fail;
+	} else {
+		exec->ct0ca = exec->ct0ea = 0;
+	}
+
+	ret = vc4_get_rcl(dev, exec);
+	if (ret)
+		goto fail;
+
+	/* Clear this out of the struct we'll be putting in the queue,
+	 * since it's part of our stack.
+	 */
+	exec->args = NULL;
+
+	vc4_queue_submit(dev, exec);
+
+	/* Return the seqno for our job. */
+	args->seqno = vc4->emit_seqno;
+
+	mutex_unlock(&dev->struct_mutex);
+
+	return 0;
+
+fail:
+	vc4_complete_exec(exec);
+
+	mutex_unlock(&dev->struct_mutex);
+
+	return ret;
+}
+
+void
+vc4_gem_init(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	INIT_LIST_HEAD(&vc4->job_list);
+	INIT_LIST_HEAD(&vc4->job_done_list);
+	INIT_LIST_HEAD(&vc4->seqno_cb_list);
+	spin_lock_init(&vc4->job_lock);
+
+	INIT_WORK(&vc4->hangcheck.reset_work, vc4_reset_work);
+	setup_timer(&vc4->hangcheck.timer,
+		    vc4_hangcheck_elapsed,
+		    (unsigned long) dev);
+
+	INIT_WORK(&vc4->job_done_work, vc4_job_done_work);
+}
+
+void
+vc4_gem_destroy(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	/* Waiting for exec to finish would need to be done before
+	 * unregistering V3D.
+	 */
+	WARN_ON(vc4->emit_seqno != vc4->finished_seqno);
+
+	/* V3D should already have disabled its interrupt and cleared
+	 * the overflow allocation registers.  Now free the object.
+	 */
+	if (vc4->overflow_mem) {
+		drm_gem_object_unreference_unlocked(&vc4->overflow_mem->base.base);
+		vc4->overflow_mem = NULL;
+	}
+
+	vc4_bo_cache_destroy(dev);
+}

drivers/gpu/drm/vc4/vc4_irq.c

@@ -0,0 +1,211 @@
+/*
+ * Copyright © 2014 Broadcom
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/** DOC: Interrupt management for the V3D engine.
+ *
+ * We have an interrupt status register (V3D_INTCTL) which reports
+ * interrupts, and where writing 1 bits clears those interrupts.
+ * There are also a pair of interrupt registers
+ * (V3D_INTENA/V3D_INTDIS) where writing a 1 to their bits enables or
+ * disables that specific interrupt, and 0s written are ignored
+ * (reading either one returns the set of enabled interrupts).
+ *
+ * When we take a render frame interrupt, we need to wake the
+ * processes waiting for some frame to be done, and get the next frame
+ * submitted ASAP (so the hardware doesn't sit idle when there's work
+ * to do).
+ *
+ * When we take the binner out of memory interrupt, we need to
+ * allocate some new memory and pass it to the binner so that the
+ * current job can make progress.
+ */
+
+#include "vc4_drv.h"
+#include "vc4_regs.h"
+
+#define V3D_DRIVER_IRQS (V3D_INT_OUTOMEM | \
+			 V3D_INT_FRDONE)
+
+DECLARE_WAIT_QUEUE_HEAD(render_wait);
+
+static void
+vc4_overflow_mem_work(struct work_struct *work)
+{
+	struct vc4_dev *vc4 =
+		container_of(work, struct vc4_dev, overflow_mem_work);
+	struct drm_device *dev = vc4->dev;
+	struct vc4_bo *bo;
+
+	bo = vc4_bo_create(dev, 256 * 1024);
+	if (!bo) {
+		DRM_ERROR("Couldn't allocate binner overflow mem\n");
+		return;
+	}
+
+	/* If there's a job executing currently, then our previous
+	 * overflow allocation is getting used in that job and we need
+	 * to queue it to be released when the job is done.  But if no
+	 * job is executing at all, then we can free the old overflow
+	 * object direcctly.
+	 *
+	 * No lock necessary for this pointer since we're the only
+	 * ones that update the pointer, and our workqueue won't
+	 * reenter.
+	 */
+	if (vc4->overflow_mem) {
+		struct vc4_exec_info *current_exec;
+		unsigned long irqflags;
+
+		spin_lock_irqsave(&vc4->job_lock, irqflags);
+		current_exec = vc4_first_job(vc4);
+		if (current_exec) {
+			vc4->overflow_mem->seqno = vc4->finished_seqno + 1;
+			list_add_tail(&vc4->overflow_mem->unref_head,
+				      &current_exec->unref_list);
+			vc4->overflow_mem = NULL;
+		}
+		spin_unlock_irqrestore(&vc4->job_lock, irqflags);
+	}
+
+	if (vc4->overflow_mem) {
+		drm_gem_object_unreference_unlocked(&vc4->overflow_mem->base.base);
+	}
+	vc4->overflow_mem = bo;
+
+	V3D_WRITE(V3D_BPOA, bo->base.paddr);
+	V3D_WRITE(V3D_BPOS, bo->base.base.size);
+	V3D_WRITE(V3D_INTCTL, V3D_INT_OUTOMEM);
+	V3D_WRITE(V3D_INTENA, V3D_INT_OUTOMEM);
+}
+
+static void
+vc4_irq_finish_job(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	struct vc4_exec_info *exec = vc4_first_job(vc4);
+
+	if (!exec)
+		return;
+
+	vc4->finished_seqno++;
+	list_move_tail(&exec->head, &vc4->job_done_list);
+	vc4_submit_next_job(dev);
+
+	wake_up_all(&vc4->job_wait_queue);
+	schedule_work(&vc4->job_done_work);
+}
+
+irqreturn_t
+vc4_irq(int irq, void *arg)
+{
+	struct drm_device *dev = arg;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	uint32_t intctl;
+	irqreturn_t status = IRQ_NONE;
+
+	barrier();
+	intctl = V3D_READ(V3D_INTCTL);
+
+	/* Acknowledge the interrupts we're handling here. The render
+	 * frame done interrupt will be cleared, while OUTOMEM will
+	 * stay high until the underlying cause is cleared.
+	 */
+	V3D_WRITE(V3D_INTCTL, intctl);
+
+	if (intctl & V3D_INT_OUTOMEM) {
+		/* Disable OUTOMEM until the work is done. */
+		V3D_WRITE(V3D_INTDIS, V3D_INT_OUTOMEM);
+		schedule_work(&vc4->overflow_mem_work);
+		status = IRQ_HANDLED;
+	}
+
+	if (intctl & V3D_INT_FRDONE) {
+		spin_lock(&vc4->job_lock);
+		vc4_irq_finish_job(dev);
+		spin_unlock(&vc4->job_lock);
+		status = IRQ_HANDLED;
+	}
+
+	return status;
+}
+
+void
+vc4_irq_preinstall(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	init_waitqueue_head(&vc4->job_wait_queue);
+	INIT_WORK(&vc4->overflow_mem_work, vc4_overflow_mem_work);
+
+	/* Clear any pending interrupts someone might have left around
+	 * for us.
+	 */
+	V3D_WRITE(V3D_INTCTL, V3D_DRIVER_IRQS);
+}
+
+int
+vc4_irq_postinstall(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	/* Enable both the render done and out of memory interrupts. */
+	V3D_WRITE(V3D_INTENA, V3D_DRIVER_IRQS);
+
+	return 0;
+}
+
+void
+vc4_irq_uninstall(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	/* Disable sending interrupts for our driver's IRQs. */
+	V3D_WRITE(V3D_INTDIS, V3D_DRIVER_IRQS);
+
+	/* Clear any pending interrupts we might have left. */
+	V3D_WRITE(V3D_INTCTL, V3D_DRIVER_IRQS);
+
+	cancel_work_sync(&vc4->overflow_mem_work);
+}
+
+/** Reinitializes interrupt registers when a GPU reset is performed. */
+void vc4_irq_reset(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	unsigned long irqflags;
+
+	/* Acknowledge any stale IRQs. */
+	V3D_WRITE(V3D_INTCTL, V3D_DRIVER_IRQS);
+
+	/*
+	 * Turn all our interrupts on.  Binner out of memory is the
+	 * only one we expect to trigger at this point, since we've
+	 * just come from poweron and haven't supplied any overflow
+	 * memory yet.
+	 */
+	V3D_WRITE(V3D_INTENA, V3D_DRIVER_IRQS);
+
+	spin_lock_irqsave(&vc4->job_lock, irqflags);
+	vc4_irq_finish_job(dev);
+	spin_unlock_irqrestore(&vc4->job_lock, irqflags);
+}

drivers/gpu/drm/vc4/vc4_kms.c

@@ -15,6 +15,7 @@
  */
 
 #include "drm_crtc.h"
+#include "drm_atomic.h"
 #include "drm_atomic_helper.h"
 #include "drm_crtc_helper.h"
 #include "drm_plane_helper.h"
@@ -29,10 +30,151 @@ static void vc4_output_poll_changed(struct drm_device *dev)
 		drm_fbdev_cma_hotplug_event(vc4->fbdev);
 }
 
+struct vc4_commit {
+	struct drm_device *dev;
+	struct drm_atomic_state *state;
+	struct vc4_seqno_cb cb;
+};
+
+static void
+vc4_atomic_complete_commit(struct vc4_commit *c)
+{
+	struct drm_atomic_state *state = c->state;
+	struct drm_device *dev = state->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	drm_atomic_helper_commit_modeset_disables(dev, state);
+
+	drm_atomic_helper_commit_planes(dev, state);
+
+	drm_atomic_helper_commit_modeset_enables(dev, state);
+
+	drm_atomic_helper_wait_for_vblanks(dev, state);
+
+	drm_atomic_helper_cleanup_planes(dev, state);
+
+	drm_atomic_state_free(state);
+
+	up(&vc4->async_modeset);
+
+	kfree(c);
+}
+
+static void
+vc4_atomic_complete_commit_seqno_cb(struct vc4_seqno_cb *cb)
+{
+	struct vc4_commit *c = container_of(cb, struct vc4_commit, cb);
+
+	vc4_atomic_complete_commit(c);
+}
+
+static struct vc4_commit *commit_init(struct drm_atomic_state *state)
+{
+	struct vc4_commit *c = kzalloc(sizeof(*c), GFP_KERNEL);
+
+	if (!c)
+		return NULL;
+	c->dev = state->dev;
+	c->state = state;
+
+	return c;
+}
+
+/**
+ * vc4_atomic_commit - commit validated state object
+ * @dev: DRM device
+ * @state: the driver state object
+ * @async: asynchronous commit
+ *
+ * This function commits a with drm_atomic_helper_check() pre-validated state
+ * object. This can still fail when e.g. the framebuffer reservation fails. For
+ * now this doesn't implement asynchronous commits.
+ *
+ * RETURNS
+ * Zero for success or -errno.
+ */
+static int vc4_atomic_commit(struct drm_device *dev,
+			     struct drm_atomic_state *state,
+			     bool async)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	int ret;
+	int i;
+	uint64_t wait_seqno = 0;
+	struct vc4_commit *c;
+
+	c = commit_init(state);
+	if (!c)
+		return -ENOMEM;
+
+	/* Make sure that any outstanding modesets have finished. */
+	ret = down_interruptible(&vc4->async_modeset);
+	if (ret) {
+		kfree(c);
+		return ret;
+	}
+
+	ret = drm_atomic_helper_prepare_planes(dev, state);
+	if (ret) {
+		kfree(c);
+		up(&vc4->async_modeset);
+		return ret;
+	}
+
+	for (i = 0; i < dev->mode_config.num_total_plane; i++) {
+		struct drm_plane *plane = state->planes[i];
+		struct drm_plane_state *new_state = state->plane_states[i];
+
+		if (!plane)
+			continue;
+
+		if ((plane->state->fb != new_state->fb) && new_state->fb) {
+			struct drm_gem_cma_object *cma_bo =
+				drm_fb_cma_get_gem_obj(new_state->fb, 0);
+			struct vc4_bo *bo = to_vc4_bo(&cma_bo->base);
+			wait_seqno = max(bo->seqno, wait_seqno);
+		}
+	}
+
+	/*
+	 * This is the point of no return - everything below never fails except
+	 * when the hw goes bonghits. Which means we can commit the new state on
+	 * the software side now.
+	 */
+
+	drm_atomic_helper_swap_state(dev, state);
+
+	/*
+	 * Everything below can be run asynchronously without the need to grab
+	 * any modeset locks at all under one condition: It must be guaranteed
+	 * that the asynchronous work has either been cancelled (if the driver
+	 * supports it, which at least requires that the framebuffers get
+	 * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
+	 * before the new state gets committed on the software side with
+	 * drm_atomic_helper_swap_state().
+	 *
+	 * This scheme allows new atomic state updates to be prepared and
+	 * checked in parallel to the asynchronous completion of the previous
+	 * update. Which is important since compositors need to figure out the
+	 * composition of the next frame right after having submitted the
+	 * current layout.
+	 */
+
+	if (async) {
+		vc4_queue_seqno_cb(dev, &c->cb, wait_seqno,
+				   vc4_atomic_complete_commit_seqno_cb);
+	} else {
+		vc4_wait_for_seqno(dev, wait_seqno, ~0ull, false);
+		vc4_atomic_complete_commit(c);
+	}
+
+	return 0;
+}
+
 static const struct drm_mode_config_funcs vc4_mode_funcs = {
 	.output_poll_changed = vc4_output_poll_changed,
 	.atomic_check = drm_atomic_helper_check,
-	.atomic_commit = drm_atomic_helper_commit,
+	.atomic_commit = vc4_atomic_commit,
 	.fb_create = drm_fb_cma_create,
 };
 
@@ -41,6 +183,8 @@ int vc4_kms_load(struct drm_device *dev)
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	int ret;
 
+	sema_init(&vc4->async_modeset, 1);
+
 	ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
 	if (ret < 0) {
 		dev_err(dev->dev, "failed to initialize vblank\n");
@@ -51,6 +195,8 @@ int vc4_kms_load(struct drm_device *dev)
 	dev->mode_config.max_height = 2048;
 	dev->mode_config.funcs = &vc4_mode_funcs;
 	dev->mode_config.preferred_depth = 24;
+	dev->mode_config.async_page_flip = true;
+
 	dev->vblank_disable_allowed = true;
 
 	drm_mode_config_reset(dev);

drivers/gpu/drm/vc4/vc4_packet.h

@@ -0,0 +1,384 @@
+/*
+ * Copyright © 2014 Broadcom
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef VC4_PACKET_H
+#define VC4_PACKET_H
+
+#include "vc4_regs.h" /* for VC4_MASK, VC4_GET_FIELD, VC4_SET_FIELD */
+
+enum vc4_packet {
+        VC4_PACKET_HALT = 0,
+        VC4_PACKET_NOP = 1,
+
+        VC4_PACKET_FLUSH = 4,
+        VC4_PACKET_FLUSH_ALL = 5,
+        VC4_PACKET_START_TILE_BINNING = 6,
+        VC4_PACKET_INCREMENT_SEMAPHORE = 7,
+        VC4_PACKET_WAIT_ON_SEMAPHORE = 8,
+
+        VC4_PACKET_BRANCH = 16,
+        VC4_PACKET_BRANCH_TO_SUB_LIST = 17,
+
+        VC4_PACKET_STORE_MS_TILE_BUFFER = 24,
+        VC4_PACKET_STORE_MS_TILE_BUFFER_AND_EOF = 25,
+        VC4_PACKET_STORE_FULL_RES_TILE_BUFFER = 26,
+        VC4_PACKET_LOAD_FULL_RES_TILE_BUFFER = 27,
+        VC4_PACKET_STORE_TILE_BUFFER_GENERAL = 28,
+        VC4_PACKET_LOAD_TILE_BUFFER_GENERAL = 29,
+
+        VC4_PACKET_GL_INDEXED_PRIMITIVE = 32,
+        VC4_PACKET_GL_ARRAY_PRIMITIVE = 33,
+
+        VC4_PACKET_COMPRESSED_PRIMITIVE = 48,
+        VC4_PACKET_CLIPPED_COMPRESSED_PRIMITIVE = 49,
+
+        VC4_PACKET_PRIMITIVE_LIST_FORMAT = 56,
+
+        VC4_PACKET_GL_SHADER_STATE = 64,
+        VC4_PACKET_NV_SHADER_STATE = 65,
+        VC4_PACKET_VG_SHADER_STATE = 66,
+
+        VC4_PACKET_CONFIGURATION_BITS = 96,
+        VC4_PACKET_FLAT_SHADE_FLAGS = 97,
+        VC4_PACKET_POINT_SIZE = 98,
+        VC4_PACKET_LINE_WIDTH = 99,
+        VC4_PACKET_RHT_X_BOUNDARY = 100,
+        VC4_PACKET_DEPTH_OFFSET = 101,
+        VC4_PACKET_CLIP_WINDOW = 102,
+        VC4_PACKET_VIEWPORT_OFFSET = 103,
+        VC4_PACKET_Z_CLIPPING = 104,
+        VC4_PACKET_CLIPPER_XY_SCALING = 105,
+        VC4_PACKET_CLIPPER_Z_SCALING = 106,
+
+        VC4_PACKET_TILE_BINNING_MODE_CONFIG = 112,
+        VC4_PACKET_TILE_RENDERING_MODE_CONFIG = 113,
+        VC4_PACKET_CLEAR_COLORS = 114,
+        VC4_PACKET_TILE_COORDINATES = 115,
+
+        /* Not an actual hardware packet -- this is what we use to put
+         * references to GEM bos in the command stream, since we need the u32
+         * int the actual address packet in order to store the offset from the
+         * start of the BO.
+         */
+        VC4_PACKET_GEM_HANDLES = 254,
+} __attribute__ ((__packed__));
+
+#define VC4_PACKET_HALT_SIZE						1
+#define VC4_PACKET_NOP_SIZE						1
+#define VC4_PACKET_FLUSH_SIZE						1
+#define VC4_PACKET_FLUSH_ALL_SIZE					1
+#define VC4_PACKET_START_TILE_BINNING_SIZE				1
+#define VC4_PACKET_INCREMENT_SEMAPHORE_SIZE				1
+#define VC4_PACKET_WAIT_ON_SEMAPHORE_SIZE				1
+#define VC4_PACKET_BRANCH_SIZE						5
+#define VC4_PACKET_BRANCH_TO_SUB_LIST_SIZE				5
+#define VC4_PACKET_STORE_MS_TILE_BUFFER_SIZE				1
+#define VC4_PACKET_STORE_MS_TILE_BUFFER_AND_EOF_SIZE			1
+#define VC4_PACKET_STORE_FULL_RES_TILE_BUFFER_SIZE			5
+#define VC4_PACKET_LOAD_FULL_RES_TILE_BUFFER_SIZE			5
+#define VC4_PACKET_STORE_TILE_BUFFER_GENERAL_SIZE			7
+#define VC4_PACKET_LOAD_TILE_BUFFER_GENERAL_SIZE			7
+#define VC4_PACKET_GL_INDEXED_PRIMITIVE_SIZE				14
+#define VC4_PACKET_GL_ARRAY_PRIMITIVE_SIZE				10
+#define VC4_PACKET_COMPRESSED_PRIMITIVE_SIZE				1
+#define VC4_PACKET_CLIPPED_COMPRESSED_PRIMITIVE_SIZE			1
+#define VC4_PACKET_PRIMITIVE_LIST_FORMAT_SIZE				2
+#define VC4_PACKET_GL_SHADER_STATE_SIZE					5
+#define VC4_PACKET_NV_SHADER_STATE_SIZE					5
+#define VC4_PACKET_VG_SHADER_STATE_SIZE					5
+#define VC4_PACKET_CONFIGURATION_BITS_SIZE				4
+#define VC4_PACKET_FLAT_SHADE_FLAGS_SIZE				5
+#define VC4_PACKET_POINT_SIZE_SIZE					5
+#define VC4_PACKET_LINE_WIDTH_SIZE					5
+#define VC4_PACKET_RHT_X_BOUNDARY_SIZE					3
+#define VC4_PACKET_DEPTH_OFFSET_SIZE					5
+#define VC4_PACKET_CLIP_WINDOW_SIZE					9
+#define VC4_PACKET_VIEWPORT_OFFSET_SIZE					5
+#define VC4_PACKET_Z_CLIPPING_SIZE					9
+#define VC4_PACKET_CLIPPER_XY_SCALING_SIZE				9
+#define VC4_PACKET_CLIPPER_Z_SCALING_SIZE				9
+#define VC4_PACKET_TILE_BINNING_MODE_CONFIG_SIZE			16
+#define VC4_PACKET_TILE_RENDERING_MODE_CONFIG_SIZE			11
+#define VC4_PACKET_CLEAR_COLORS_SIZE					14
+#define VC4_PACKET_TILE_COORDINATES_SIZE				3
+#define VC4_PACKET_GEM_HANDLES_SIZE					9
+
+/** @{
+ * Bits used by packets like VC4_PACKET_STORE_TILE_BUFFER_GENERAL and
+ * VC4_PACKET_TILE_RENDERING_MODE_CONFIG.
+*/
+#define VC4_TILING_FORMAT_LINEAR    0
+#define VC4_TILING_FORMAT_T         1
+#define VC4_TILING_FORMAT_LT        2
+/** @} */
+
+/** @{
+ *
+ * low bits of VC4_PACKET_STORE_FULL_RES_TILE_BUFFER and
+ * VC4_PACKET_LOAD_FULL_RES_TILE_BUFFER.
+ */
+#define VC4_LOADSTORE_FULL_RES_EOF                     (1 << 3)
+#define VC4_LOADSTORE_FULL_RES_DISABLE_CLEAR_ALL       (1 << 2)
+#define VC4_LOADSTORE_FULL_RES_DISABLE_ZS              (1 << 1)
+#define VC4_LOADSTORE_FULL_RES_DISABLE_COLOR           (1 << 0)
+
+/** @{
+ *
+ * byte 2 of VC4_PACKET_STORE_TILE_BUFFER_GENERAL and
+ * VC4_PACKET_LOAD_TILE_BUFFER_GENERAL (low bits of the address)
+ */
+
+#define VC4_LOADSTORE_TILE_BUFFER_EOF                  (1 << 3)
+#define VC4_LOADSTORE_TILE_BUFFER_DISABLE_FULL_VG_MASK (1 << 2)
+#define VC4_LOADSTORE_TILE_BUFFER_DISABLE_FULL_ZS      (1 << 1)
+#define VC4_LOADSTORE_TILE_BUFFER_DISABLE_FULL_COLOR   (1 << 0)
+
+/** @} */
+
+/** @{
+ *
+ * byte 0-1 of VC4_PACKET_STORE_TILE_BUFFER_GENERAL and
+ * VC4_PACKET_LOAD_TILE_BUFFER_GENERAL
+ */
+#define VC4_STORE_TILE_BUFFER_DISABLE_VG_MASK_CLEAR (1 << 15)
+#define VC4_STORE_TILE_BUFFER_DISABLE_ZS_CLEAR     (1 << 14)
+#define VC4_STORE_TILE_BUFFER_DISABLE_COLOR_CLEAR  (1 << 13)
+#define VC4_STORE_TILE_BUFFER_DISABLE_SWAP         (1 << 12)
+
+#define VC4_LOADSTORE_TILE_BUFFER_FORMAT_MASK      VC4_MASK(9, 8)
+#define VC4_LOADSTORE_TILE_BUFFER_FORMAT_SHIFT     8
+#define VC4_LOADSTORE_TILE_BUFFER_RGBA8888         0
+#define VC4_LOADSTORE_TILE_BUFFER_BGR565_DITHER    1
+#define VC4_LOADSTORE_TILE_BUFFER_BGR565           2
+/** @} */
+
+/** @{
+ *
+ * byte 0 of VC4_PACKET_STORE_TILE_BUFFER_GENERAL and
+ * VC4_PACKET_LOAD_TILE_BUFFER_GENERAL
+ */
+#define VC4_STORE_TILE_BUFFER_MODE_MASK            VC4_MASK(7, 6)
+#define VC4_STORE_TILE_BUFFER_MODE_SHIFT           6
+#define VC4_STORE_TILE_BUFFER_MODE_SAMPLE0         (0 << 6)
+#define VC4_STORE_TILE_BUFFER_MODE_DECIMATE_X4     (1 << 6)
+#define VC4_STORE_TILE_BUFFER_MODE_DECIMATE_X16    (2 << 6)
+
+/** The values of the field are VC4_TILING_FORMAT_* */
+#define VC4_LOADSTORE_TILE_BUFFER_TILING_MASK      VC4_MASK(5, 4)
+#define VC4_LOADSTORE_TILE_BUFFER_TILING_SHIFT     4
+
+#define VC4_LOADSTORE_TILE_BUFFER_BUFFER_MASK      VC4_MASK(2, 0)
+#define VC4_LOADSTORE_TILE_BUFFER_BUFFER_SHIFT     0
+#define VC4_LOADSTORE_TILE_BUFFER_NONE             0
+#define VC4_LOADSTORE_TILE_BUFFER_COLOR            1
+#define VC4_LOADSTORE_TILE_BUFFER_ZS               2
+#define VC4_LOADSTORE_TILE_BUFFER_Z                3
+#define VC4_LOADSTORE_TILE_BUFFER_VG_MASK          4
+#define VC4_LOADSTORE_TILE_BUFFER_FULL             5
+/** @} */
+
+#define VC4_INDEX_BUFFER_U8                        (0 << 4)
+#define VC4_INDEX_BUFFER_U16                       (1 << 4)
+
+/* This flag is only present in NV shader state. */
+#define VC4_SHADER_FLAG_SHADED_CLIP_COORDS         (1 << 3)
+#define VC4_SHADER_FLAG_ENABLE_CLIPPING            (1 << 2)
+#define VC4_SHADER_FLAG_VS_POINT_SIZE              (1 << 1)
+#define VC4_SHADER_FLAG_FS_SINGLE_THREAD           (1 << 0)
+
+/** @{ byte 2 of config bits. */
+#define VC4_CONFIG_BITS_EARLY_Z_UPDATE             (1 << 1)
+#define VC4_CONFIG_BITS_EARLY_Z                    (1 << 0)
+/** @} */
+
+/** @{ byte 1 of config bits. */
+#define VC4_CONFIG_BITS_Z_UPDATE                   (1 << 7)
+/** same values in this 3-bit field as PIPE_FUNC_* */
+#define VC4_CONFIG_BITS_DEPTH_FUNC_SHIFT           4
+#define VC4_CONFIG_BITS_COVERAGE_READ_LEAVE        (1 << 3)
+
+#define VC4_CONFIG_BITS_COVERAGE_UPDATE_NONZERO    (0 << 1)
+#define VC4_CONFIG_BITS_COVERAGE_UPDATE_ODD        (1 << 1)
+#define VC4_CONFIG_BITS_COVERAGE_UPDATE_OR         (2 << 1)
+#define VC4_CONFIG_BITS_COVERAGE_UPDATE_ZERO       (3 << 1)
+
+#define VC4_CONFIG_BITS_COVERAGE_PIPE_SELECT       (1 << 0)
+/** @} */
+
+/** @{ byte 0 of config bits. */
+#define VC4_CONFIG_BITS_RASTERIZER_OVERSAMPLE_NONE (0 << 6)
+#define VC4_CONFIG_BITS_RASTERIZER_OVERSAMPLE_4X   (1 << 6)
+#define VC4_CONFIG_BITS_RASTERIZER_OVERSAMPLE_16X  (2 << 6)
+
+#define VC4_CONFIG_BITS_AA_POINTS_AND_LINES        (1 << 4)
+#define VC4_CONFIG_BITS_ENABLE_DEPTH_OFFSET        (1 << 3)
+#define VC4_CONFIG_BITS_CW_PRIMITIVES              (1 << 2)
+#define VC4_CONFIG_BITS_ENABLE_PRIM_BACK           (1 << 1)
+#define VC4_CONFIG_BITS_ENABLE_PRIM_FRONT          (1 << 0)
+/** @} */
+
+/** @{ bits in the last u8 of VC4_PACKET_TILE_BINNING_MODE_CONFIG */
+#define VC4_BIN_CONFIG_DB_NON_MS                   (1 << 7)
+
+#define VC4_BIN_CONFIG_ALLOC_BLOCK_SIZE_MASK       VC4_MASK(6, 5)
+#define VC4_BIN_CONFIG_ALLOC_BLOCK_SIZE_SHIFT      5
+#define VC4_BIN_CONFIG_ALLOC_BLOCK_SIZE_32         0
+#define VC4_BIN_CONFIG_ALLOC_BLOCK_SIZE_64         1
+#define VC4_BIN_CONFIG_ALLOC_BLOCK_SIZE_128        2
+#define VC4_BIN_CONFIG_ALLOC_BLOCK_SIZE_256        3
+
+#define VC4_BIN_CONFIG_ALLOC_INIT_BLOCK_SIZE_MASK  VC4_MASK(4, 3)
+#define VC4_BIN_CONFIG_ALLOC_INIT_BLOCK_SIZE_SHIFT 3
+#define VC4_BIN_CONFIG_ALLOC_INIT_BLOCK_SIZE_32    0
+#define VC4_BIN_CONFIG_ALLOC_INIT_BLOCK_SIZE_64    1
+#define VC4_BIN_CONFIG_ALLOC_INIT_BLOCK_SIZE_128   2
+#define VC4_BIN_CONFIG_ALLOC_INIT_BLOCK_SIZE_256   3
+
+#define VC4_BIN_CONFIG_AUTO_INIT_TSDA              (1 << 2)
+#define VC4_BIN_CONFIG_TILE_BUFFER_64BIT           (1 << 1)
+#define VC4_BIN_CONFIG_MS_MODE_4X                  (1 << 0)
+/** @} */
+
+/** @{ bits in the last u16 of VC4_PACKET_TILE_RENDERING_MODE_CONFIG */
+#define VC4_RENDER_CONFIG_DB_NON_MS                (1 << 12)
+#define VC4_RENDER_CONFIG_EARLY_Z_COVERAGE_DISABLE (1 << 11)
+#define VC4_RENDER_CONFIG_EARLY_Z_DIRECTION_G      (1 << 10)
+#define VC4_RENDER_CONFIG_COVERAGE_MODE            (1 << 9)
+#define VC4_RENDER_CONFIG_ENABLE_VG_MASK           (1 << 8)
+
+/** The values of the field are VC4_TILING_FORMAT_* */
+#define VC4_RENDER_CONFIG_MEMORY_FORMAT_MASK       VC4_MASK(7, 6)
+#define VC4_RENDER_CONFIG_MEMORY_FORMAT_SHIFT      6
+
+#define VC4_RENDER_CONFIG_DECIMATE_MODE_1X         (0 << 4)
+#define VC4_RENDER_CONFIG_DECIMATE_MODE_4X         (1 << 4)
+#define VC4_RENDER_CONFIG_DECIMATE_MODE_16X        (2 << 4)
+
+#define VC4_RENDER_CONFIG_FORMAT_MASK              VC4_MASK(3, 2)
+#define VC4_RENDER_CONFIG_FORMAT_SHIFT             2
+#define VC4_RENDER_CONFIG_FORMAT_BGR565_DITHERED   0
+#define VC4_RENDER_CONFIG_FORMAT_RGBA8888          1
+#define VC4_RENDER_CONFIG_FORMAT_BGR565            2
+
+#define VC4_RENDER_CONFIG_TILE_BUFFER_64BIT        (1 << 1)
+#define VC4_RENDER_CONFIG_MS_MODE_4X               (1 << 0)
+
+#define VC4_PRIMITIVE_LIST_FORMAT_16_INDEX         (1 << 4)
+#define VC4_PRIMITIVE_LIST_FORMAT_32_XY            (3 << 4)
+#define VC4_PRIMITIVE_LIST_FORMAT_TYPE_POINTS      (0 << 0)
+#define VC4_PRIMITIVE_LIST_FORMAT_TYPE_LINES       (1 << 0)
+#define VC4_PRIMITIVE_LIST_FORMAT_TYPE_TRIANGLES   (2 << 0)
+#define VC4_PRIMITIVE_LIST_FORMAT_TYPE_RHT         (3 << 0)
+
+enum vc4_texture_data_type {
+        VC4_TEXTURE_TYPE_RGBA8888 = 0,
+        VC4_TEXTURE_TYPE_RGBX8888 = 1,
+        VC4_TEXTURE_TYPE_RGBA4444 = 2,
+        VC4_TEXTURE_TYPE_RGBA5551 = 3,
+        VC4_TEXTURE_TYPE_RGB565 = 4,
+        VC4_TEXTURE_TYPE_LUMINANCE = 5,
+        VC4_TEXTURE_TYPE_ALPHA = 6,
+        VC4_TEXTURE_TYPE_LUMALPHA = 7,
+        VC4_TEXTURE_TYPE_ETC1 = 8,
+        VC4_TEXTURE_TYPE_S16F = 9,
+        VC4_TEXTURE_TYPE_S8 = 10,
+        VC4_TEXTURE_TYPE_S16 = 11,
+        VC4_TEXTURE_TYPE_BW1 = 12,
+        VC4_TEXTURE_TYPE_A4 = 13,
+        VC4_TEXTURE_TYPE_A1 = 14,
+        VC4_TEXTURE_TYPE_RGBA64 = 15,
+        VC4_TEXTURE_TYPE_RGBA32R = 16,
+        VC4_TEXTURE_TYPE_YUV422R = 17,
+};
+
+#define VC4_TEX_P0_OFFSET_MASK                     VC4_MASK(31, 12)
+#define VC4_TEX_P0_OFFSET_SHIFT                    12
+#define VC4_TEX_P0_CSWIZ_MASK                      VC4_MASK(11, 10)
+#define VC4_TEX_P0_CSWIZ_SHIFT                     10
+#define VC4_TEX_P0_CMMODE_MASK                     VC4_MASK(9, 9)
+#define VC4_TEX_P0_CMMODE_SHIFT                    9
+#define VC4_TEX_P0_FLIPY_MASK                      VC4_MASK(8, 8)
+#define VC4_TEX_P0_FLIPY_SHIFT                     8
+#define VC4_TEX_P0_TYPE_MASK                       VC4_MASK(7, 4)
+#define VC4_TEX_P0_TYPE_SHIFT                      4
+#define VC4_TEX_P0_MIPLVLS_MASK                    VC4_MASK(3, 0)
+#define VC4_TEX_P0_MIPLVLS_SHIFT                   0
+
+#define VC4_TEX_P1_TYPE4_MASK                      VC4_MASK(31, 31)
+#define VC4_TEX_P1_TYPE4_SHIFT                     31
+#define VC4_TEX_P1_HEIGHT_MASK                     VC4_MASK(30, 20)
+#define VC4_TEX_P1_HEIGHT_SHIFT                    20
+#define VC4_TEX_P1_ETCFLIP_MASK                    VC4_MASK(19, 19)
+#define VC4_TEX_P1_ETCFLIP_SHIFT                   19
+#define VC4_TEX_P1_WIDTH_MASK                      VC4_MASK(18, 8)
+#define VC4_TEX_P1_WIDTH_SHIFT                     8
+
+#define VC4_TEX_P1_MAGFILT_MASK                    VC4_MASK(7, 7)
+#define VC4_TEX_P1_MAGFILT_SHIFT                   7
+# define VC4_TEX_P1_MAGFILT_LINEAR                 0
+# define VC4_TEX_P1_MAGFILT_NEAREST                1
+
+#define VC4_TEX_P1_MINFILT_MASK                    VC4_MASK(6, 4)
+#define VC4_TEX_P1_MINFILT_SHIFT                   4
+# define VC4_TEX_P1_MINFILT_LINEAR                 0
+# define VC4_TEX_P1_MINFILT_NEAREST                1
+# define VC4_TEX_P1_MINFILT_NEAR_MIP_NEAR          2
+# define VC4_TEX_P1_MINFILT_NEAR_MIP_LIN           3
+# define VC4_TEX_P1_MINFILT_LIN_MIP_NEAR           4
+# define VC4_TEX_P1_MINFILT_LIN_MIP_LIN            5
+
+#define VC4_TEX_P1_WRAP_T_MASK                     VC4_MASK(3, 2)
+#define VC4_TEX_P1_WRAP_T_SHIFT                    2
+#define VC4_TEX_P1_WRAP_S_MASK                     VC4_MASK(1, 0)
+#define VC4_TEX_P1_WRAP_S_SHIFT                    0
+# define VC4_TEX_P1_WRAP_REPEAT                    0
+# define VC4_TEX_P1_WRAP_CLAMP                     1
+# define VC4_TEX_P1_WRAP_MIRROR                    2
+# define VC4_TEX_P1_WRAP_BORDER                    3
+
+#define VC4_TEX_P2_PTYPE_MASK                      VC4_MASK(31, 30)
+#define VC4_TEX_P2_PTYPE_SHIFT                     30
+# define VC4_TEX_P2_PTYPE_IGNORED                  0
+# define VC4_TEX_P2_PTYPE_CUBE_MAP_STRIDE          1
+# define VC4_TEX_P2_PTYPE_CHILD_IMAGE_DIMENSIONS   2
+# define VC4_TEX_P2_PTYPE_CHILD_IMAGE_OFFSETS      3
+
+/* VC4_TEX_P2_PTYPE_CUBE_MAP_STRIDE bits */
+#define VC4_TEX_P2_CMST_MASK                       VC4_MASK(29, 12)
+#define VC4_TEX_P2_CMST_SHIFT                      12
+#define VC4_TEX_P2_BSLOD_MASK                      VC4_MASK(0, 0)
+#define VC4_TEX_P2_BSLOD_SHIFT                     0
+
+/* VC4_TEX_P2_PTYPE_CHILD_IMAGE_DIMENSIONS */
+#define VC4_TEX_P2_CHEIGHT_MASK                    VC4_MASK(22, 12)
+#define VC4_TEX_P2_CHEIGHT_SHIFT                   12
+#define VC4_TEX_P2_CWIDTH_MASK                     VC4_MASK(10, 0)
+#define VC4_TEX_P2_CWIDTH_SHIFT                    0
+
+/* VC4_TEX_P2_PTYPE_CHILD_IMAGE_OFFSETS */
+#define VC4_TEX_P2_CYOFF_MASK                      VC4_MASK(22, 12)
+#define VC4_TEX_P2_CYOFF_SHIFT                     12
+#define VC4_TEX_P2_CXOFF_MASK                      VC4_MASK(10, 0)
+#define VC4_TEX_P2_CXOFF_SHIFT                     0
+
+#endif /* VC4_PACKET_H */

drivers/gpu/drm/vc4/vc4_plane.c

@@ -29,6 +29,14 @@ struct vc4_plane_state {
 	u32 *dlist;
 	u32 dlist_size; /* Number of dwords in allocated for the display list */
 	u32 dlist_count; /* Number of used dwords in the display list. */
+
+	/* Offset in the dlist to pointer word 0. */
+	u32 pw0_offset;
+
+	/* Offset where the plane's dlist was last stored in the
+	   hardware at vc4_crtc_atomic_flush() time.
+	*/
+	u32 *hw_dlist;
 };
 
 static inline struct vc4_plane_state *
@@ -207,6 +215,8 @@ static int vc4_plane_mode_set(struct drm_plane *plane,
 	/* Position Word 3: Context.  Written by the HVS. */
 	vc4_dlist_write(vc4_state, 0xc0c0c0c0);
 
+	vc4_state->pw0_offset = vc4_state->dlist_count;
+
 	/* Pointer Word 0: RGB / Y Pointer */
 	vc4_dlist_write(vc4_state, bo->paddr + offset);
 
@@ -258,6 +268,8 @@ u32 vc4_plane_write_dlist(struct drm_plane *plane, u32 __iomem *dlist)
 	struct vc4_plane_state *vc4_state = to_vc4_plane_state(plane->state);
 	int i;
 
+	vc4_state->hw_dlist = dlist;
+
 	/* Can't memcpy_toio() because it needs to be 32-bit writes. */
 	for (i = 0; i < vc4_state->dlist_count; i++)
 		writel(vc4_state->dlist[i], &dlist[i]);
@@ -272,6 +284,34 @@ u32 vc4_plane_dlist_size(struct drm_plane_state *state)
 	return vc4_state->dlist_count;
 }
 
+/* Updates the plane to immediately (well, once the FIFO needs
+ * refilling) scan out from at a new framebuffer.
+ */
+void vc4_plane_async_set_fb(struct drm_plane *plane, struct drm_framebuffer *fb)
+{
+	struct vc4_plane_state *vc4_state = to_vc4_plane_state(plane->state);
+	struct drm_gem_cma_object *bo = drm_fb_cma_get_gem_obj(fb, 0);
+	uint32_t addr;
+
+	/* We're skipping the address adjustment for negative origin,
+	 * because this is only called on the primary plane.
+	 */
+	WARN_ON_ONCE(plane->state->crtc_x < 0 || plane->state->crtc_y < 0);
+	addr = bo->paddr + fb->offsets[0];
+
+	/* Write the new address into the hardware immediately.  The
+	 * scanout will start from this address as soon as the FIFO
+	 * needs to refill with pixels.
+	 */
+	writel(addr, &vc4_state->hw_dlist[vc4_state->pw0_offset]);
+
+	/* Also update the CPU-side dlist copy, so that any later
+	 * atomic updates that don't do a new modeset on our plane
+	 * also use our updated address.
+	 */
+	vc4_state->dlist[vc4_state->pw0_offset] = addr;
+}
+
 static const struct drm_plane_helper_funcs vc4_plane_helper_funcs = {
 	.prepare_fb = NULL,
 	.cleanup_fb = NULL,

drivers/gpu/drm/vc4/vc4_qpu_defines.h

@@ -0,0 +1,268 @@
+/*
+ * Copyright © 2014 Broadcom
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef VC4_QPU_DEFINES_H
+#define VC4_QPU_DEFINES_H
+
+enum qpu_op_add {
+        QPU_A_NOP,
+        QPU_A_FADD,
+        QPU_A_FSUB,
+        QPU_A_FMIN,
+        QPU_A_FMAX,
+        QPU_A_FMINABS,
+        QPU_A_FMAXABS,
+        QPU_A_FTOI,
+        QPU_A_ITOF,
+        QPU_A_ADD = 12,
+        QPU_A_SUB,
+        QPU_A_SHR,
+        QPU_A_ASR,
+        QPU_A_ROR,
+        QPU_A_SHL,
+        QPU_A_MIN,
+        QPU_A_MAX,
+        QPU_A_AND,
+        QPU_A_OR,
+        QPU_A_XOR,
+        QPU_A_NOT,
+        QPU_A_CLZ,
+        QPU_A_V8ADDS = 30,
+        QPU_A_V8SUBS = 31,
+};
+
+enum qpu_op_mul {
+        QPU_M_NOP,
+        QPU_M_FMUL,
+        QPU_M_MUL24,
+        QPU_M_V8MULD,
+        QPU_M_V8MIN,
+        QPU_M_V8MAX,
+        QPU_M_V8ADDS,
+        QPU_M_V8SUBS,
+};
+
+enum qpu_raddr {
+        QPU_R_FRAG_PAYLOAD_ZW = 15, /* W for A file, Z for B file */
+        /* 0-31 are the plain regfile a or b fields */
+        QPU_R_UNIF = 32,
+        QPU_R_VARY = 35,
+        QPU_R_ELEM_QPU = 38,
+        QPU_R_NOP,
+        QPU_R_XY_PIXEL_COORD = 41,
+        QPU_R_MS_REV_FLAGS = 41,
+        QPU_R_VPM = 48,
+        QPU_R_VPM_LD_BUSY,
+        QPU_R_VPM_LD_WAIT,
+        QPU_R_MUTEX_ACQUIRE,
+};
+
+enum qpu_waddr {
+        /* 0-31 are the plain regfile a or b fields */
+        QPU_W_ACC0 = 32, /* aka r0 */
+        QPU_W_ACC1,
+        QPU_W_ACC2,
+        QPU_W_ACC3,
+        QPU_W_TMU_NOSWAP,
+        QPU_W_ACC5,
+        QPU_W_HOST_INT,
+        QPU_W_NOP,
+        QPU_W_UNIFORMS_ADDRESS,
+        QPU_W_QUAD_XY, /* X for regfile a, Y for regfile b */
+        QPU_W_MS_FLAGS = 42,
+        QPU_W_REV_FLAG = 42,
+        QPU_W_TLB_STENCIL_SETUP = 43,
+        QPU_W_TLB_Z,
+        QPU_W_TLB_COLOR_MS,
+        QPU_W_TLB_COLOR_ALL,
+        QPU_W_TLB_ALPHA_MASK,
+        QPU_W_VPM,
+        QPU_W_VPMVCD_SETUP, /* LD for regfile a, ST for regfile b */
+        QPU_W_VPM_ADDR, /* LD for regfile a, ST for regfile b */
+        QPU_W_MUTEX_RELEASE,
+        QPU_W_SFU_RECIP,
+        QPU_W_SFU_RECIPSQRT,
+        QPU_W_SFU_EXP,
+        QPU_W_SFU_LOG,
+        QPU_W_TMU0_S,
+        QPU_W_TMU0_T,
+        QPU_W_TMU0_R,
+        QPU_W_TMU0_B,
+        QPU_W_TMU1_S,
+        QPU_W_TMU1_T,
+        QPU_W_TMU1_R,
+        QPU_W_TMU1_B,
+};
+
+enum qpu_sig_bits {
+        QPU_SIG_SW_BREAKPOINT,
+        QPU_SIG_NONE,
+        QPU_SIG_THREAD_SWITCH,
+        QPU_SIG_PROG_END,
+        QPU_SIG_WAIT_FOR_SCOREBOARD,
+        QPU_SIG_SCOREBOARD_UNLOCK,
+        QPU_SIG_LAST_THREAD_SWITCH,
+        QPU_SIG_COVERAGE_LOAD,
+        QPU_SIG_COLOR_LOAD,
+        QPU_SIG_COLOR_LOAD_END,
+        QPU_SIG_LOAD_TMU0,
+        QPU_SIG_LOAD_TMU1,
+        QPU_SIG_ALPHA_MASK_LOAD,
+        QPU_SIG_SMALL_IMM,
+        QPU_SIG_LOAD_IMM,
+        QPU_SIG_BRANCH
+};
+
+enum qpu_mux {
+        /* hardware mux values */
+        QPU_MUX_R0,
+        QPU_MUX_R1,
+        QPU_MUX_R2,
+        QPU_MUX_R3,
+        QPU_MUX_R4,
+        QPU_MUX_R5,
+        QPU_MUX_A,
+        QPU_MUX_B,
+
+        /* non-hardware mux values */
+        QPU_MUX_IMM,
+};
+
+enum qpu_cond {
+        QPU_COND_NEVER,
+        QPU_COND_ALWAYS,
+        QPU_COND_ZS,
+        QPU_COND_ZC,
+        QPU_COND_NS,
+        QPU_COND_NC,
+        QPU_COND_CS,
+        QPU_COND_CC,
+};
+
+enum qpu_pack_mul {
+        QPU_PACK_MUL_NOP,
+        QPU_PACK_MUL_8888 = 3, /* replicated to each 8 bits of the 32-bit dst. */
+        QPU_PACK_MUL_8A,
+        QPU_PACK_MUL_8B,
+        QPU_PACK_MUL_8C,
+        QPU_PACK_MUL_8D,
+};
+
+enum qpu_pack_a {
+        QPU_PACK_A_NOP,
+        /* convert to 16 bit float if float input, or to int16. */
+        QPU_PACK_A_16A,
+        QPU_PACK_A_16B,
+        /* replicated to each 8 bits of the 32-bit dst. */
+        QPU_PACK_A_8888,
+        /* Convert to 8-bit unsigned int. */
+        QPU_PACK_A_8A,
+        QPU_PACK_A_8B,
+        QPU_PACK_A_8C,
+        QPU_PACK_A_8D,
+
+        /* Saturating variants of the previous instructions. */
+        QPU_PACK_A_32_SAT, /* int-only */
+        QPU_PACK_A_16A_SAT, /* int or float */
+        QPU_PACK_A_16B_SAT,
+        QPU_PACK_A_8888_SAT,
+        QPU_PACK_A_8A_SAT,
+        QPU_PACK_A_8B_SAT,
+        QPU_PACK_A_8C_SAT,
+        QPU_PACK_A_8D_SAT,
+};
+
+enum qpu_unpack_r4 {
+        QPU_UNPACK_R4_NOP,
+        QPU_UNPACK_R4_F16A_TO_F32,
+        QPU_UNPACK_R4_F16B_TO_F32,
+        QPU_UNPACK_R4_8D_REP,
+        QPU_UNPACK_R4_8A,
+        QPU_UNPACK_R4_8B,
+        QPU_UNPACK_R4_8C,
+        QPU_UNPACK_R4_8D,
+};
+
+#define QPU_MASK(high, low) ((((uint64_t)1<<((high)-(low)+1))-1)<<(low))
+/* Using the GNU statement expression extension */
+#define QPU_SET_FIELD(value, field)                                       \
+        ({                                                                \
+                uint64_t fieldval = (uint64_t)(value) << field ## _SHIFT; \
+                assert((fieldval & ~ field ## _MASK) == 0);               \
+                fieldval & field ## _MASK;                                \
+         })
+
+#define QPU_GET_FIELD(word, field) ((uint32_t)(((word)  & field ## _MASK) >> field ## _SHIFT))
+
+#define QPU_SIG_SHIFT                   60
+#define QPU_SIG_MASK                    QPU_MASK(63, 60)
+
+#define QPU_UNPACK_SHIFT                57
+#define QPU_UNPACK_MASK                 QPU_MASK(59, 57)
+
+/**
+ * If set, the pack field means PACK_MUL or R4 packing, instead of normal
+ * regfile a packing.
+ */
+#define QPU_PM                          ((uint64_t)1 << 56)
+
+#define QPU_PACK_SHIFT                  52
+#define QPU_PACK_MASK                   QPU_MASK(55, 52)
+
+#define QPU_COND_ADD_SHIFT              49
+#define QPU_COND_ADD_MASK               QPU_MASK(51, 49)
+#define QPU_COND_MUL_SHIFT              46
+#define QPU_COND_MUL_MASK               QPU_MASK(48, 46)
+
+#define QPU_SF                          ((uint64_t)1 << 45)
+
+#define QPU_WADDR_ADD_SHIFT             38
+#define QPU_WADDR_ADD_MASK              QPU_MASK(43, 38)
+#define QPU_WADDR_MUL_SHIFT             32
+#define QPU_WADDR_MUL_MASK              QPU_MASK(37, 32)
+
+#define QPU_OP_MUL_SHIFT                29
+#define QPU_OP_MUL_MASK                 QPU_MASK(31, 29)
+
+#define QPU_RADDR_A_SHIFT               18
+#define QPU_RADDR_A_MASK                QPU_MASK(23, 18)
+#define QPU_RADDR_B_SHIFT               12
+#define QPU_RADDR_B_MASK                QPU_MASK(17, 12)
+#define QPU_SMALL_IMM_SHIFT             12
+#define QPU_SMALL_IMM_MASK              QPU_MASK(17, 12)
+
+#define QPU_ADD_A_SHIFT                 9
+#define QPU_ADD_A_MASK                  QPU_MASK(11, 9)
+#define QPU_ADD_B_SHIFT                 6
+#define QPU_ADD_B_MASK                  QPU_MASK(8, 6)
+#define QPU_MUL_A_SHIFT                 3
+#define QPU_MUL_A_MASK                  QPU_MASK(5, 3)
+#define QPU_MUL_B_SHIFT                 0
+#define QPU_MUL_B_MASK                  QPU_MASK(2, 0)
+
+#define QPU_WS                          ((uint64_t)1 << 44)
+
+#define QPU_OP_ADD_SHIFT                24
+#define QPU_OP_ADD_MASK                 QPU_MASK(28, 24)
+
+#endif /* VC4_QPU_DEFINES_H */

drivers/gpu/drm/vc4/vc4_render_cl.c

@@ -0,0 +1,448 @@
+/*
+ * Copyright © 2014-2015 Broadcom
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/**
+ * DOC: Render command list generation
+ *
+ * In the VC4 driver, render command list generation is performed by the
+ * kernel instead of userspace.  We do this because validating a
+ * user-submitted command list is hard to get right and has high CPU overhead,
+ * while the number of valid configurations for render command lists is
+ * actually fairly low.
+ */
+
+#include "uapi/drm/vc4_drm.h"
+#include "vc4_drv.h"
+#include "vc4_packet.h"
+
+struct vc4_rcl_setup {
+	struct drm_gem_cma_object *color_read;
+	struct drm_gem_cma_object *color_ms_write;
+	struct drm_gem_cma_object *zs_read;
+	struct drm_gem_cma_object *zs_write;
+
+	struct drm_gem_cma_object *rcl;
+	u32 next_offset;
+};
+
+static inline void rcl_u8(struct vc4_rcl_setup *setup, u8 val)
+{
+	*(u8 *)(setup->rcl->vaddr + setup->next_offset) = val;
+	setup->next_offset += 1;
+}
+
+static inline void rcl_u16(struct vc4_rcl_setup *setup, u16 val)
+{
+	*(u16 *)(setup->rcl->vaddr + setup->next_offset) = val;
+	setup->next_offset += 2;
+}
+
+static inline void rcl_u32(struct vc4_rcl_setup *setup, u32 val)
+{
+	*(u32 *)(setup->rcl->vaddr + setup->next_offset) = val;
+	setup->next_offset += 4;
+}
+
+
+/*
+ * Emits a no-op STORE_TILE_BUFFER_GENERAL.
+ *
+ * If we emit a PACKET_TILE_COORDINATES, it must be followed by a store of
+ * some sort before another load is triggered.
+ */
+static void vc4_store_before_load(struct vc4_rcl_setup *setup)
+{
+	rcl_u8(setup, VC4_PACKET_STORE_TILE_BUFFER_GENERAL);
+	rcl_u16(setup,
+		VC4_SET_FIELD(VC4_LOADSTORE_TILE_BUFFER_NONE,
+			      VC4_LOADSTORE_TILE_BUFFER_BUFFER) |
+		VC4_STORE_TILE_BUFFER_DISABLE_COLOR_CLEAR |
+		VC4_STORE_TILE_BUFFER_DISABLE_ZS_CLEAR |
+		VC4_STORE_TILE_BUFFER_DISABLE_VG_MASK_CLEAR);
+	rcl_u32(setup, 0); /* no address, since we're in None mode */
+}
+
+/*
+ * Emits a PACKET_TILE_COORDINATES if one isn't already pending.
+ *
+ * The tile coordinates packet triggers a pending load if there is one, are
+ * used for clipping during rendering, and determine where loads/stores happen
+ * relative to their base address.
+ */
+static void vc4_tile_coordinates(struct vc4_rcl_setup *setup,
+				 uint32_t x, uint32_t y)
+{
+	rcl_u8(setup, VC4_PACKET_TILE_COORDINATES);
+	rcl_u8(setup, x);
+	rcl_u8(setup, y);
+}
+
+static void emit_tile(struct vc4_exec_info *exec,
+		      struct vc4_rcl_setup *setup,
+		      uint8_t x, uint8_t y, bool first, bool last)
+{
+	struct drm_vc4_submit_cl *args = exec->args;
+	bool has_bin = args->bin_cl_size != 0;
+
+	/* Note that the load doesn't actually occur until the
+	 * tile coords packet is processed, and only one load
+	 * may be outstanding at a time.
+	 */
+	if (setup->color_read) {
+		rcl_u8(setup, VC4_PACKET_LOAD_TILE_BUFFER_GENERAL);
+		rcl_u16(setup, args->color_read.bits);
+		rcl_u32(setup,
+			setup->color_read->paddr + args->color_read.offset);
+	}
+
+	if (setup->zs_read) {
+		if (setup->color_read) {
+			/* Exec previous load. */
+			vc4_tile_coordinates(setup, x, y);
+			vc4_store_before_load(setup);
+		}
+
+		rcl_u8(setup, VC4_PACKET_LOAD_TILE_BUFFER_GENERAL);
+		rcl_u16(setup, args->zs_read.bits);
+		rcl_u32(setup, setup->zs_read->paddr + args->zs_read.offset);
+	}
+
+	/* Clipping depends on tile coordinates having been
+	 * emitted, so we always need one here.
+	 */
+	vc4_tile_coordinates(setup, x, y);
+
+	/* Wait for the binner before jumping to the first
+	 * tile's lists.
+	 */
+	if (first && has_bin)
+		rcl_u8(setup, VC4_PACKET_WAIT_ON_SEMAPHORE);
+
+	if (has_bin) {
+		rcl_u8(setup, VC4_PACKET_BRANCH_TO_SUB_LIST);
+		rcl_u32(setup, (exec->tile_bo->paddr +
+				exec->tile_alloc_offset +
+				(y * exec->bin_tiles_x + x) * 32));
+	}
+
+	if (setup->zs_write) {
+		rcl_u8(setup, VC4_PACKET_STORE_TILE_BUFFER_GENERAL);
+		rcl_u16(setup, args->zs_write.bits |
+			(setup->color_ms_write ?
+			 VC4_STORE_TILE_BUFFER_DISABLE_COLOR_CLEAR : 0));
+		rcl_u32(setup,
+			(setup->zs_write->paddr + args->zs_write.offset) |
+			((last && !setup->color_ms_write) ?
+			 VC4_LOADSTORE_TILE_BUFFER_EOF : 0));
+	}
+
+	if (setup->color_ms_write) {
+		if (setup->zs_write) {
+			/* Reset after previous store */
+			vc4_tile_coordinates(setup, x, y);
+		}
+
+		if (last)
+			rcl_u8(setup, VC4_PACKET_STORE_MS_TILE_BUFFER_AND_EOF);
+		else
+			rcl_u8(setup, VC4_PACKET_STORE_MS_TILE_BUFFER);
+	}
+}
+
+static int vc4_create_rcl_bo(struct drm_device *dev, struct vc4_exec_info *exec,
+			     struct vc4_rcl_setup *setup)
+{
+	struct drm_vc4_submit_cl *args = exec->args;
+	bool has_bin = args->bin_cl_size != 0;
+	uint8_t min_x_tile = args->min_x_tile;
+	uint8_t min_y_tile = args->min_y_tile;
+	uint8_t max_x_tile = args->max_x_tile;
+	uint8_t max_y_tile = args->max_y_tile;
+	uint8_t xtiles = max_x_tile - min_x_tile + 1;
+	uint8_t ytiles = max_y_tile - min_y_tile + 1;
+	uint8_t x, y;
+	uint32_t size, loop_body_size;
+
+	size = VC4_PACKET_TILE_RENDERING_MODE_CONFIG_SIZE;
+	loop_body_size = VC4_PACKET_TILE_COORDINATES_SIZE;
+
+	if (args->flags & VC4_SUBMIT_CL_USE_CLEAR_COLOR) {
+		size += VC4_PACKET_CLEAR_COLORS_SIZE +
+			VC4_PACKET_TILE_COORDINATES_SIZE +
+			VC4_PACKET_STORE_TILE_BUFFER_GENERAL_SIZE;
+	}
+
+	if (setup->color_read) {
+		loop_body_size += (VC4_PACKET_LOAD_TILE_BUFFER_GENERAL_SIZE);
+	}
+	if (setup->zs_read) {
+		if (setup->color_read) {
+			loop_body_size += VC4_PACKET_TILE_COORDINATES_SIZE;
+			loop_body_size += VC4_PACKET_STORE_TILE_BUFFER_GENERAL_SIZE;
+		}
+		loop_body_size += VC4_PACKET_LOAD_TILE_BUFFER_GENERAL_SIZE;
+	}
+
+	if (has_bin) {
+		size += VC4_PACKET_WAIT_ON_SEMAPHORE_SIZE;
+		loop_body_size += VC4_PACKET_BRANCH_TO_SUB_LIST_SIZE;
+	}
+
+	if (setup->zs_write)
+		loop_body_size += VC4_PACKET_STORE_TILE_BUFFER_GENERAL_SIZE;
+	if (setup->color_ms_write) {
+		if (setup->zs_write)
+			loop_body_size += VC4_PACKET_TILE_COORDINATES_SIZE;
+		loop_body_size += VC4_PACKET_STORE_MS_TILE_BUFFER_SIZE;
+	}
+	size += xtiles * ytiles * loop_body_size;
+
+	setup->rcl = &vc4_bo_create(dev, size)->base;
+	if (!setup->rcl)
+		return -ENOMEM;
+	list_add_tail(&to_vc4_bo(&setup->rcl->base)->unref_head,
+		      &exec->unref_list);
+
+	rcl_u8(setup, VC4_PACKET_TILE_RENDERING_MODE_CONFIG);
+	rcl_u32(setup,
+		(setup->color_ms_write ?
+		 (setup->color_ms_write->paddr +
+		  args->color_ms_write.offset) :
+		 0));
+	rcl_u16(setup, args->width);
+	rcl_u16(setup, args->height);
+	rcl_u16(setup, args->color_ms_write.bits);
+
+	/* The tile buffer gets cleared when the previous tile is stored.  If
+	 * the clear values changed between frames, then the tile buffer has
+	 * stale clear values in it, so we have to do a store in None mode (no
+	 * writes) so that we trigger the tile buffer clear.
+	 */
+	if (args->flags & VC4_SUBMIT_CL_USE_CLEAR_COLOR) {
+		rcl_u8(setup, VC4_PACKET_CLEAR_COLORS);
+		rcl_u32(setup, args->clear_color[0]);
+		rcl_u32(setup, args->clear_color[1]);
+		rcl_u32(setup, args->clear_z);
+		rcl_u8(setup, args->clear_s);
+
+		vc4_tile_coordinates(setup, 0, 0);
+
+		rcl_u8(setup, VC4_PACKET_STORE_TILE_BUFFER_GENERAL);
+		rcl_u16(setup, VC4_LOADSTORE_TILE_BUFFER_NONE);
+		rcl_u32(setup, 0); /* no address, since we're in None mode */
+	}
+
+	for (y = min_y_tile; y <= max_y_tile; y++) {
+		for (x = min_x_tile; x <= max_x_tile; x++) {
+			bool first = (x == min_x_tile && y == min_y_tile);
+			bool last = (x == max_x_tile && y == max_y_tile);
+			emit_tile(exec, setup, x, y, first, last);
+		}
+	}
+
+	BUG_ON(setup->next_offset != size);
+	exec->ct1ca = setup->rcl->paddr;
+	exec->ct1ea = setup->rcl->paddr + setup->next_offset;
+
+	return 0;
+}
+
+static int vc4_rcl_surface_setup(struct vc4_exec_info *exec,
+				 struct drm_gem_cma_object **obj,
+				 struct drm_vc4_submit_rcl_surface *surf)
+{
+	uint8_t tiling = VC4_GET_FIELD(surf->bits,
+				       VC4_LOADSTORE_TILE_BUFFER_TILING);
+	uint8_t buffer = VC4_GET_FIELD(surf->bits,
+				       VC4_LOADSTORE_TILE_BUFFER_BUFFER);
+	uint8_t format = VC4_GET_FIELD(surf->bits,
+				       VC4_LOADSTORE_TILE_BUFFER_FORMAT);
+	int cpp;
+
+	if (surf->pad != 0) {
+		DRM_ERROR("Padding unset\n");
+		return -EINVAL;
+	}
+
+	if (surf->hindex == ~0)
+		return 0;
+
+	if (!vc4_use_bo(exec, surf->hindex, VC4_MODE_RENDER, obj))
+		return -EINVAL;
+
+	if (surf->bits & ~(VC4_LOADSTORE_TILE_BUFFER_TILING_MASK |
+			   VC4_LOADSTORE_TILE_BUFFER_BUFFER_MASK |
+			   VC4_LOADSTORE_TILE_BUFFER_FORMAT_MASK)) {
+		DRM_ERROR("Unknown bits in load/store: 0x%04x\n",
+			  surf->bits);
+		return -EINVAL;
+	}
+
+	if (tiling > VC4_TILING_FORMAT_LT) {
+		DRM_ERROR("Bad tiling format\n");
+		return -EINVAL;
+	}
+
+	if (buffer == VC4_LOADSTORE_TILE_BUFFER_ZS) {
+		if (format != 0) {
+			DRM_ERROR("No color format should be set for ZS\n");
+			return -EINVAL;
+		}
+		cpp = 4;
+	} else if (buffer == VC4_LOADSTORE_TILE_BUFFER_COLOR) {
+		switch (format) {
+		case VC4_LOADSTORE_TILE_BUFFER_BGR565:
+		case VC4_LOADSTORE_TILE_BUFFER_BGR565_DITHER:
+			cpp = 2;
+			break;
+		case VC4_LOADSTORE_TILE_BUFFER_RGBA8888:
+			cpp = 4;
+			break;
+		default:
+			DRM_ERROR("Bad tile buffer format\n");
+			return -EINVAL;
+		}
+	} else {
+		DRM_ERROR("Bad load/store buffer %d.\n", buffer);
+		return -EINVAL;
+	}
+
+	if (surf->offset & 0xf) {
+		DRM_ERROR("load/store buffer must be 16b aligned.\n");
+		return -EINVAL;
+	}
+
+	if (!vc4_check_tex_size(exec, *obj, surf->offset, tiling,
+				exec->args->width, exec->args->height, cpp)) {
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int
+vc4_rcl_ms_surface_setup(struct vc4_exec_info *exec,
+			 struct drm_gem_cma_object **obj,
+			 struct drm_vc4_submit_rcl_surface *surf)
+{
+	uint8_t tiling = VC4_GET_FIELD(surf->bits,
+				       VC4_RENDER_CONFIG_MEMORY_FORMAT);
+	uint8_t format = VC4_GET_FIELD(surf->bits,
+				       VC4_RENDER_CONFIG_FORMAT);
+	int cpp;
+
+	if (surf->pad != 0) {
+		DRM_ERROR("Padding unset\n");
+		return -EINVAL;
+	}
+
+	if (surf->bits & ~(VC4_RENDER_CONFIG_MEMORY_FORMAT_MASK |
+			   VC4_RENDER_CONFIG_FORMAT_MASK)) {
+		DRM_ERROR("Unknown bits in render config: 0x%04x\n",
+			  surf->bits);
+		return -EINVAL;
+	}
+
+	if (surf->hindex == ~0)
+		return 0;
+
+	if (!vc4_use_bo(exec, surf->hindex, VC4_MODE_RENDER, obj))
+		return -EINVAL;
+
+	if (tiling > VC4_TILING_FORMAT_LT) {
+		DRM_ERROR("Bad tiling format\n");
+		return -EINVAL;
+	}
+
+	switch (format) {
+	case VC4_RENDER_CONFIG_FORMAT_BGR565_DITHERED:
+	case VC4_RENDER_CONFIG_FORMAT_BGR565:
+		cpp = 2;
+		break;
+	case VC4_RENDER_CONFIG_FORMAT_RGBA8888:
+		cpp = 4;
+		break;
+	default:
+		DRM_ERROR("Bad tile buffer format\n");
+		return -EINVAL;
+	}
+
+	if (!vc4_check_tex_size(exec, *obj, surf->offset, tiling,
+				exec->args->width, exec->args->height, cpp)) {
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+int vc4_get_rcl(struct drm_device *dev, struct vc4_exec_info *exec)
+{
+	struct vc4_rcl_setup setup = {0};
+	struct drm_vc4_submit_cl *args = exec->args;
+	bool has_bin = args->bin_cl_size != 0;
+	int ret;
+
+	if (args->min_x_tile > args->max_x_tile ||
+	    args->min_y_tile > args->max_y_tile) {
+		DRM_ERROR("Bad render tile set (%d,%d)-(%d,%d)\n",
+			  args->min_x_tile, args->min_y_tile,
+			  args->max_x_tile, args->max_y_tile);
+		return -EINVAL;
+	}
+
+	if (has_bin &&
+	    (args->max_x_tile > exec->bin_tiles_x ||
+	     args->max_y_tile > exec->bin_tiles_y)) {
+		DRM_ERROR("Render tiles (%d,%d) outside of bin config (%d,%d)\n",
+			  args->max_x_tile, args->max_y_tile,
+			  exec->bin_tiles_x, exec->bin_tiles_y);
+		return -EINVAL;
+	}
+
+	ret = vc4_rcl_surface_setup(exec, &setup.color_read, &args->color_read);
+	if (ret)
+		return ret;
+
+	ret = vc4_rcl_ms_surface_setup(exec, &setup.color_ms_write,
+				       &args->color_ms_write);
+	if (ret)
+		return ret;
+
+	ret = vc4_rcl_surface_setup(exec, &setup.zs_read, &args->zs_read);
+	if (ret)
+		return ret;
+
+	ret = vc4_rcl_surface_setup(exec, &setup.zs_write, &args->zs_write);
+	if (ret)
+		return ret;
+
+	/* We shouldn't even have the job submitted to us if there's no
+	 * surface to write out.
+	 */
+	if (!setup.color_ms_write && !setup.zs_write) {
+		DRM_ERROR("RCL requires color or Z/S write\n");
+		return -EINVAL;
+	}
+
+	return vc4_create_rcl_bo(dev, exec, &setup);
+}

drivers/gpu/drm/vc4/vc4_trace.h

@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2015 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#if !defined(_VC4_TRACE_H_) || defined(TRACE_HEADER_MULTI_READ)
+#define _VC4_TRACE_H_
+
+#include <linux/stringify.h>
+#include <linux/types.h>
+#include <linux/tracepoint.h>
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM vc4
+#define TRACE_INCLUDE_FILE vc4_trace
+
+TRACE_EVENT(vc4_wait_for_seqno_begin,
+	    TP_PROTO(struct drm_device *dev, uint64_t seqno, uint64_t timeout),
+	    TP_ARGS(dev, seqno, timeout),
+
+	    TP_STRUCT__entry(
+			     __field(u32, dev)
+			     __field(u64, seqno)
+			     __field(u64, timeout)
+			     ),
+
+	    TP_fast_assign(
+			   __entry->dev = dev->primary->index;
+			   __entry->seqno = seqno;
+			   __entry->timeout = timeout;
+			   ),
+
+	    TP_printk("dev=%u, seqno=%llu, timeout=%llu",
+		      __entry->dev, __entry->seqno, __entry->timeout)
+);
+
+TRACE_EVENT(vc4_wait_for_seqno_end,
+	    TP_PROTO(struct drm_device *dev, uint64_t seqno),
+	    TP_ARGS(dev, seqno),
+
+	    TP_STRUCT__entry(
+			     __field(u32, dev)
+			     __field(u64, seqno)
+			     ),
+
+	    TP_fast_assign(
+			   __entry->dev = dev->primary->index;
+			   __entry->seqno = seqno;
+			   ),
+
+	    TP_printk("dev=%u, seqno=%llu",
+		      __entry->dev, __entry->seqno)
+);
+
+#endif /* _VC4_TRACE_H_ */
+
+/* This part must be outside protection */
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#include <trace/define_trace.h>

drivers/gpu/drm/vc4/vc4_trace_points.c

@@ -0,0 +1,14 @@
+/*
+ * Copyright (C) 2015 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "vc4_drv.h"
+
+#ifndef __CHECKER__
+#define CREATE_TRACE_POINTS
+#include "vc4_trace.h"
+#endif

drivers/gpu/drm/vc4/vc4_v3d.c

@@ -0,0 +1,268 @@
+/*
+ * Copyright (c) 2014 The Linux Foundation. All rights reserved.
+ * Copyright (C) 2013 Red Hat
+ * Author: Rob Clark <robdclark@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "linux/component.h"
+#include "soc/bcm2835/raspberrypi-firmware.h"
+#include "vc4_drv.h"
+#include "vc4_regs.h"
+
+#ifdef CONFIG_DEBUG_FS
+#define REGDEF(reg) { reg, #reg }
+static const struct {
+	uint32_t reg;
+	const char *name;
+} vc4_reg_defs[] = {
+	REGDEF(V3D_IDENT0),
+	REGDEF(V3D_IDENT1),
+	REGDEF(V3D_IDENT2),
+	REGDEF(V3D_SCRATCH),
+	REGDEF(V3D_L2CACTL),
+	REGDEF(V3D_SLCACTL),
+	REGDEF(V3D_INTCTL),
+	REGDEF(V3D_INTENA),
+	REGDEF(V3D_INTDIS),
+	REGDEF(V3D_CT0CS),
+	REGDEF(V3D_CT1CS),
+	REGDEF(V3D_CT0EA),
+	REGDEF(V3D_CT1EA),
+	REGDEF(V3D_CT0CA),
+	REGDEF(V3D_CT1CA),
+	REGDEF(V3D_CT00RA0),
+	REGDEF(V3D_CT01RA0),
+	REGDEF(V3D_CT0LC),
+	REGDEF(V3D_CT1LC),
+	REGDEF(V3D_CT0PC),
+	REGDEF(V3D_CT1PC),
+	REGDEF(V3D_PCS),
+	REGDEF(V3D_BFC),
+	REGDEF(V3D_RFC),
+	REGDEF(V3D_BPCA),
+	REGDEF(V3D_BPCS),
+	REGDEF(V3D_BPOA),
+	REGDEF(V3D_BPOS),
+	REGDEF(V3D_BXCF),
+	REGDEF(V3D_SQRSV0),
+	REGDEF(V3D_SQRSV1),
+	REGDEF(V3D_SQCNTL),
+	REGDEF(V3D_SRQPC),
+	REGDEF(V3D_SRQUA),
+	REGDEF(V3D_SRQUL),
+	REGDEF(V3D_SRQCS),
+	REGDEF(V3D_VPACNTL),
+	REGDEF(V3D_VPMBASE),
+	REGDEF(V3D_PCTRC),
+	REGDEF(V3D_PCTRE),
+	REGDEF(V3D_PCTR0),
+	REGDEF(V3D_PCTRS0),
+	REGDEF(V3D_PCTR1),
+	REGDEF(V3D_PCTRS1),
+	REGDEF(V3D_PCTR2),
+	REGDEF(V3D_PCTRS2),
+	REGDEF(V3D_PCTR3),
+	REGDEF(V3D_PCTRS3),
+	REGDEF(V3D_PCTR4),
+	REGDEF(V3D_PCTRS4),
+	REGDEF(V3D_PCTR5),
+	REGDEF(V3D_PCTRS5),
+	REGDEF(V3D_PCTR6),
+	REGDEF(V3D_PCTRS6),
+	REGDEF(V3D_PCTR7),
+	REGDEF(V3D_PCTRS7),
+	REGDEF(V3D_PCTR8),
+	REGDEF(V3D_PCTRS8),
+	REGDEF(V3D_PCTR9),
+	REGDEF(V3D_PCTRS9),
+	REGDEF(V3D_PCTR10),
+	REGDEF(V3D_PCTRS10),
+	REGDEF(V3D_PCTR11),
+	REGDEF(V3D_PCTRS11),
+	REGDEF(V3D_PCTR12),
+	REGDEF(V3D_PCTRS12),
+	REGDEF(V3D_PCTR13),
+	REGDEF(V3D_PCTRS13),
+	REGDEF(V3D_PCTR14),
+	REGDEF(V3D_PCTRS14),
+	REGDEF(V3D_PCTR15),
+	REGDEF(V3D_PCTRS15),
+	REGDEF(V3D_BGE),
+	REGDEF(V3D_FDBGO),
+	REGDEF(V3D_FDBGB),
+	REGDEF(V3D_FDBGR),
+	REGDEF(V3D_FDBGS),
+	REGDEF(V3D_ERRSTAT),
+};
+
+int vc4_v3d_debugfs_regs(struct seq_file *m, void *unused)
+{
+	struct drm_info_node *node = (struct drm_info_node *) m->private;
+	struct drm_device *dev = node->minor->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(vc4_reg_defs); i++) {
+		seq_printf(m, "%s (0x%04x): 0x%08x\n",
+			   vc4_reg_defs[i].name, vc4_reg_defs[i].reg,
+			   V3D_READ(vc4_reg_defs[i].reg));
+	}
+
+	return 0;
+}
+
+int vc4_v3d_debugfs_ident(struct seq_file *m, void *unused)
+{
+	struct drm_info_node *node = (struct drm_info_node *) m->private;
+	struct drm_device *dev = node->minor->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	uint32_t ident1 = V3D_READ(V3D_IDENT1);
+	uint32_t nslc = VC4_GET_FIELD(ident1, V3D_IDENT1_NSLC);
+	uint32_t tups = VC4_GET_FIELD(ident1, V3D_IDENT1_TUPS);
+	uint32_t qups = VC4_GET_FIELD(ident1, V3D_IDENT1_QUPS);
+
+	seq_printf(m, "Revision:   %d\n", VC4_GET_FIELD(ident1, V3D_IDENT1_REV));
+	seq_printf(m, "Slices:     %d\n", nslc);
+	seq_printf(m, "TMUs:       %d\n", nslc * tups);
+	seq_printf(m, "QPUs:       %d\n", nslc * qups);
+	seq_printf(m, "Semaphores: %d\n", VC4_GET_FIELD(ident1, V3D_IDENT1_NSEM));
+
+	return 0;
+}
+#endif /* CONFIG_DEBUG_FS */
+
+/*
+ * Asks the firmware to turn on power to the V3D engine.
+ *
+ * This may be doable with just the clocks interface, though this
+ * packet does some other register setup from the firmware, too.
+ */
+int
+vc4_v3d_set_power(struct vc4_dev *vc4, bool on)
+{
+	u32 packet = on;
+
+	return rpi_firmware_property(vc4->firmware,
+				     RPI_FIRMWARE_SET_ENABLE_QPU,
+				     &packet, sizeof(packet));
+}
+
+static void vc4_v3d_init_hw(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	/* Take all the memory that would have been reserved for user
+	 * QPU programs, since we don't have an interface for running
+	 * them, anyway.
+	 */
+	V3D_WRITE(V3D_VPMBASE, 0);
+}
+
+static int vc4_v3d_bind(struct device *dev, struct device *master, void *data)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct drm_device *drm = dev_get_drvdata(master);
+	struct vc4_dev *vc4 = to_vc4_dev(drm);
+	struct vc4_v3d *v3d = NULL;
+	int ret;
+
+	v3d = devm_kzalloc(&pdev->dev, sizeof(*v3d), GFP_KERNEL);
+	if (!v3d)
+		return -ENOMEM;
+
+	v3d->pdev = pdev;
+
+	v3d->regs = vc4_ioremap_regs(pdev, 0);
+	if (IS_ERR(v3d->regs))
+		return PTR_ERR(v3d->regs);
+
+	vc4->v3d = v3d;
+
+	ret = vc4_v3d_set_power(vc4, true);
+	if (ret)
+		return ret;
+
+	if (V3D_READ(V3D_IDENT0) != V3D_EXPECTED_IDENT0) {
+		DRM_ERROR("V3D_IDENT0 read 0x%08x instead of 0x%08x\n",
+			  V3D_READ(V3D_IDENT0), V3D_EXPECTED_IDENT0);
+		return -EINVAL;
+	}
+
+	/* Reset the binner overflow address/size at setup, to be sure
+	 * we don't reuse an old one.
+	 */
+	V3D_WRITE(V3D_BPOA, 0);
+	V3D_WRITE(V3D_BPOS, 0);
+
+	vc4_v3d_init_hw(drm);
+
+	ret = drm_irq_install(drm, platform_get_irq(pdev, 0));
+	if (ret) {
+		DRM_ERROR("Failed to install IRQ handler\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static void vc4_v3d_unbind(struct device *dev, struct device *master,
+			    void *data)
+{
+	struct drm_device *drm = dev_get_drvdata(master);
+	struct vc4_dev *vc4 = to_vc4_dev(drm);
+
+	drm_irq_uninstall(drm);
+
+	/* Disable the binner's overflow memory address, so the next
+	 * driver probe (if any) doesn't try to reuse our old
+	 * allocation.
+	 */
+	V3D_WRITE(V3D_BPOA, 0);
+	V3D_WRITE(V3D_BPOS, 0);
+
+	vc4_v3d_set_power(vc4, false);
+
+	vc4->v3d = NULL;
+}
+
+static const struct component_ops vc4_v3d_ops = {
+	.bind   = vc4_v3d_bind,
+	.unbind = vc4_v3d_unbind,
+};
+
+static int vc4_v3d_dev_probe(struct platform_device *pdev)
+{
+	return component_add(&pdev->dev, &vc4_v3d_ops);
+}
+
+static int vc4_v3d_dev_remove(struct platform_device *pdev)
+{
+	component_del(&pdev->dev, &vc4_v3d_ops);
+	return 0;
+}
+
+static const struct of_device_id vc4_v3d_dt_match[] = {
+	{ .compatible = "brcm,vc4-v3d" },
+	{}
+};
+
+struct platform_driver vc4_v3d_driver = {
+	.probe = vc4_v3d_dev_probe,
+	.remove = vc4_v3d_dev_remove,
+	.driver = {
+		.name = "vc4_v3d",
+		.of_match_table = vc4_v3d_dt_match,
+	},
+};

drivers/gpu/drm/vc4/vc4_validate.c

@@ -0,0 +1,958 @@
+/*
+ * Copyright © 2014 Broadcom
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/**
+ * Command list validator for VC4.
+ *
+ * The VC4 has no IOMMU between it and system memory.  So, a user with
+ * access to execute command lists could escalate privilege by
+ * overwriting system memory (drawing to it as a framebuffer) or
+ * reading system memory it shouldn't (reading it as a texture, or
+ * uniform data, or vertex data).
+ *
+ * This validates command lists to ensure that all accesses are within
+ * the bounds of the GEM objects referenced.  It explicitly whitelists
+ * packets, and looks at the offsets in any address fields to make
+ * sure they're constrained within the BOs they reference.
+ *
+ * Note that because of the validation that's happening anyway, this
+ * is where GEM relocation processing happens.
+ */
+
+#include "uapi/drm/vc4_drm.h"
+#include "vc4_drv.h"
+#include "vc4_packet.h"
+
+#define VALIDATE_ARGS \
+	struct vc4_exec_info *exec,			\
+	void *validated,				\
+	void *untrusted
+
+
+/** Return the width in pixels of a 64-byte microtile. */
+static uint32_t
+utile_width(int cpp)
+{
+	switch (cpp) {
+	case 1:
+	case 2:
+		return 8;
+	case 4:
+		return 4;
+	case 8:
+		return 2;
+	default:
+		DRM_ERROR("unknown cpp: %d\n", cpp);
+		return 1;
+	}
+}
+
+/** Return the height in pixels of a 64-byte microtile. */
+static uint32_t
+utile_height(int cpp)
+{
+	switch (cpp) {
+	case 1:
+		return 8;
+	case 2:
+	case 4:
+	case 8:
+		return 4;
+	default:
+		DRM_ERROR("unknown cpp: %d\n", cpp);
+		return 1;
+	}
+}
+
+/**
+ * The texture unit decides what tiling format a particular miplevel is using
+ * this function, so we lay out our miptrees accordingly.
+ */
+static bool
+size_is_lt(uint32_t width, uint32_t height, int cpp)
+{
+	return (width <= 4 * utile_width(cpp) ||
+		height <= 4 * utile_height(cpp));
+}
+
+bool
+vc4_use_bo(struct vc4_exec_info *exec,
+	   uint32_t hindex,
+	   enum vc4_bo_mode mode,
+	   struct drm_gem_cma_object **obj)
+{
+	*obj = NULL;
+
+	if (hindex >= exec->bo_count) {
+		DRM_ERROR("BO index %d greater than BO count %d\n",
+			  hindex, exec->bo_count);
+		return false;
+	}
+
+	if (exec->bo[hindex].mode != mode) {
+		if (exec->bo[hindex].mode == VC4_MODE_UNDECIDED) {
+			exec->bo[hindex].mode = mode;
+		} else {
+			DRM_ERROR("BO index %d reused with mode %d vs %d\n",
+				  hindex, exec->bo[hindex].mode, mode);
+			return false;
+		}
+	}
+
+	*obj = exec->bo[hindex].bo;
+	return true;
+}
+
+static bool
+vc4_use_handle(struct vc4_exec_info *exec,
+	       uint32_t gem_handles_packet_index,
+	       enum vc4_bo_mode mode,
+	       struct drm_gem_cma_object **obj)
+{
+	return vc4_use_bo(exec, exec->bo_index[gem_handles_packet_index],
+			  mode, obj);
+}
+
+static uint32_t
+gl_shader_rec_size(uint32_t pointer_bits)
+{
+	uint32_t attribute_count = pointer_bits & 7;
+	bool extended = pointer_bits & 8;
+
+	if (attribute_count == 0)
+		attribute_count = 8;
+
+	if (extended)
+		return 100 + attribute_count * 4;
+	else
+		return 36 + attribute_count * 8;
+}
+
+bool
+vc4_check_tex_size(struct vc4_exec_info *exec, struct drm_gem_cma_object *fbo,
+		   uint32_t offset, uint8_t tiling_format,
+		   uint32_t width, uint32_t height, uint8_t cpp)
+{
+	uint32_t aligned_width, aligned_height, stride, size;
+	uint32_t utile_w = utile_width(cpp);
+	uint32_t utile_h = utile_height(cpp);
+
+	/* The shaded vertex format stores signed 12.4 fixed point
+	 * (-2048,2047) offsets from the viewport center, so we should
+	 * never have a render target larger than 4096.  The texture
+	 * unit can only sample from 2048x2048, so it's even more
+	 * restricted.  This lets us avoid worrying about overflow in
+	 * our math.
+	 */
+	if (width > 4096 || height > 4096) {
+		DRM_ERROR("Surface dimesions (%d,%d) too large", width, height);
+		return false;
+	}
+
+	switch (tiling_format) {
+	case VC4_TILING_FORMAT_LINEAR:
+		aligned_width = round_up(width, utile_w);
+		aligned_height = height;
+		break;
+	case VC4_TILING_FORMAT_T:
+		aligned_width = round_up(width, utile_w * 8);
+		aligned_height = round_up(height, utile_h * 8);
+		break;
+	case VC4_TILING_FORMAT_LT:
+		aligned_width = round_up(width, utile_w);
+		aligned_height = round_up(height, utile_h);
+		break;
+	default:
+		DRM_ERROR("buffer tiling %d unsupported\n", tiling_format);
+		return false;
+	}
+
+	stride = aligned_width * cpp;
+	size = stride * aligned_height;
+
+	if (size + offset < size ||
+	    size + offset > fbo->base.size) {
+		DRM_ERROR("Overflow in %dx%d (%dx%d) fbo size (%d + %d > %d)\n",
+			  width, height,
+			  aligned_width, aligned_height,
+			  size, offset, fbo->base.size);
+		return false;
+	}
+
+	return true;
+}
+
+static int
+validate_flush_all(VALIDATE_ARGS)
+{
+	if (exec->found_increment_semaphore_packet) {
+		DRM_ERROR("VC4_PACKET_FLUSH_ALL after "
+			  "VC4_PACKET_INCREMENT_SEMAPHORE\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int
+validate_start_tile_binning(VALIDATE_ARGS)
+{
+	if (exec->found_start_tile_binning_packet) {
+		DRM_ERROR("Duplicate VC4_PACKET_START_TILE_BINNING\n");
+		return -EINVAL;
+	}
+	exec->found_start_tile_binning_packet = true;
+
+	if (!exec->found_tile_binning_mode_config_packet) {
+		DRM_ERROR("missing VC4_PACKET_TILE_BINNING_MODE_CONFIG\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int
+validate_increment_semaphore(VALIDATE_ARGS)
+{
+	if (exec->found_increment_semaphore_packet) {
+		DRM_ERROR("Duplicate VC4_PACKET_INCREMENT_SEMAPHORE\n");
+		return -EINVAL;
+	}
+	exec->found_increment_semaphore_packet = true;
+
+	/* Once we've found the semaphore increment, there should be one FLUSH
+	 * then the end of the command list.  The FLUSH actually triggers the
+	 * increment, so we only need to make sure there
+	 */
+
+	return 0;
+}
+
+static int
+validate_indexed_prim_list(VALIDATE_ARGS)
+{
+	struct drm_gem_cma_object *ib;
+	uint32_t length = *(uint32_t *)(untrusted + 1);
+	uint32_t offset = *(uint32_t *)(untrusted + 5);
+	uint32_t max_index = *(uint32_t *)(untrusted + 9);
+	uint32_t index_size = (*(uint8_t *)(untrusted + 0) >> 4) ? 2 : 1;
+	struct vc4_shader_state *shader_state;
+
+	if (exec->found_increment_semaphore_packet) {
+		DRM_ERROR("Drawing after VC4_PACKET_INCREMENT_SEMAPHORE\n");
+		return -EINVAL;
+	}
+
+	/* Check overflow condition */
+	if (exec->shader_state_count == 0) {
+		DRM_ERROR("shader state must precede primitives\n");
+		return -EINVAL;
+	}
+	shader_state = &exec->shader_state[exec->shader_state_count - 1];
+
+	if (max_index > shader_state->max_index)
+		shader_state->max_index = max_index;
+
+	if (!vc4_use_handle(exec, 0, VC4_MODE_RENDER, &ib))
+		return -EINVAL;
+
+	if (offset > ib->base.size ||
+	    (ib->base.size - offset) / index_size < length) {
+		DRM_ERROR("IB access overflow (%d + %d*%d > %d)\n",
+			  offset, length, index_size, ib->base.size);
+		return -EINVAL;
+	}
+
+	*(uint32_t *)(validated + 5) = ib->paddr + offset;
+
+	return 0;
+}
+
+static int
+validate_gl_array_primitive(VALIDATE_ARGS)
+{
+	uint32_t length = *(uint32_t *)(untrusted + 1);
+	uint32_t base_index = *(uint32_t *)(untrusted + 5);
+	uint32_t max_index;
+	struct vc4_shader_state *shader_state;
+
+	if (exec->found_increment_semaphore_packet) {
+		DRM_ERROR("Drawing after VC4_PACKET_INCREMENT_SEMAPHORE\n");
+		return -EINVAL;
+	}
+
+	/* Check overflow condition */
+	if (exec->shader_state_count == 0) {
+		DRM_ERROR("shader state must precede primitives\n");
+		return -EINVAL;
+	}
+	shader_state = &exec->shader_state[exec->shader_state_count - 1];
+
+	if (length + base_index < length) {
+		DRM_ERROR("primitive vertex count overflow\n");
+		return -EINVAL;
+	}
+	max_index = length + base_index - 1;
+
+	if (max_index > shader_state->max_index)
+		shader_state->max_index = max_index;
+
+	return 0;
+}
+
+static int
+validate_gl_shader_state(VALIDATE_ARGS)
+{
+	uint32_t i = exec->shader_state_count++;
+
+	if (i >= exec->shader_state_size) {
+		DRM_ERROR("More requests for shader states than declared\n");
+		return -EINVAL;
+	}
+
+	exec->shader_state[i].packet = VC4_PACKET_GL_SHADER_STATE;
+	exec->shader_state[i].addr = *(uint32_t *)untrusted;
+	exec->shader_state[i].max_index = 0;
+
+	if (exec->shader_state[i].addr & ~0xf) {
+		DRM_ERROR("high bits set in GL shader rec reference\n");
+		return -EINVAL;
+	}
+
+	*(uint32_t *)validated = (exec->shader_rec_p +
+				  exec->shader_state[i].addr);
+
+	exec->shader_rec_p +=
+		roundup(gl_shader_rec_size(exec->shader_state[i].addr), 16);
+
+	return 0;
+}
+
+static int
+validate_nv_shader_state(VALIDATE_ARGS)
+{
+	uint32_t i = exec->shader_state_count++;
+
+	if (i >= exec->shader_state_size) {
+		DRM_ERROR("More requests for shader states than declared\n");
+		return -EINVAL;
+	}
+
+	exec->shader_state[i].packet = VC4_PACKET_NV_SHADER_STATE;
+	exec->shader_state[i].addr = *(uint32_t *)untrusted;
+
+	if (exec->shader_state[i].addr & 15) {
+		DRM_ERROR("NV shader state address 0x%08x misaligned\n",
+			  exec->shader_state[i].addr);
+		return -EINVAL;
+	}
+
+	*(uint32_t *)validated = (exec->shader_state[i].addr +
+				  exec->shader_rec_p);
+
+	return 0;
+}
+
+static int
+validate_tile_binning_config(VALIDATE_ARGS)
+{
+	struct drm_device *dev = exec->exec_bo->base.dev;
+	uint8_t flags;
+	uint32_t tile_state_size, tile_alloc_size;
+	uint32_t tile_count;
+
+	if (exec->found_tile_binning_mode_config_packet) {
+		DRM_ERROR("Duplicate VC4_PACKET_TILE_BINNING_MODE_CONFIG\n");
+		return -EINVAL;
+	}
+	exec->found_tile_binning_mode_config_packet = true;
+
+	exec->bin_tiles_x = *(uint8_t *)(untrusted + 12);
+	exec->bin_tiles_y = *(uint8_t *)(untrusted + 13);
+	tile_count = exec->bin_tiles_x * exec->bin_tiles_y;
+	flags = *(uint8_t *)(untrusted + 14);
+
+	if (exec->bin_tiles_x == 0 ||
+	    exec->bin_tiles_y == 0) {
+		DRM_ERROR("Tile binning config of %dx%d too small\n",
+			  exec->bin_tiles_x, exec->bin_tiles_y);
+		return -EINVAL;
+	}
+
+	if (flags & (VC4_BIN_CONFIG_DB_NON_MS |
+		     VC4_BIN_CONFIG_TILE_BUFFER_64BIT |
+		     VC4_BIN_CONFIG_MS_MODE_4X)) {
+		DRM_ERROR("unsupported bining config flags 0x%02x\n", flags);
+		return -EINVAL;
+	}
+
+	/* The tile state data array is 48 bytes per tile, and we put it at
+	 * the start of a BO containing both it and the tile alloc.
+	 */
+	tile_state_size = 48 * tile_count;
+
+	/* Since the tile alloc array will follow us, align. */
+	exec->tile_alloc_offset = roundup(tile_state_size, 4096);
+
+	*(uint8_t *)(validated + 14) =
+		((flags & ~(VC4_BIN_CONFIG_ALLOC_INIT_BLOCK_SIZE_MASK |
+			    VC4_BIN_CONFIG_ALLOC_BLOCK_SIZE_MASK)) |
+		 VC4_BIN_CONFIG_AUTO_INIT_TSDA |
+		 VC4_SET_FIELD(VC4_BIN_CONFIG_ALLOC_INIT_BLOCK_SIZE_32,
+			       VC4_BIN_CONFIG_ALLOC_INIT_BLOCK_SIZE) |
+		 VC4_SET_FIELD(VC4_BIN_CONFIG_ALLOC_BLOCK_SIZE_128,
+			       VC4_BIN_CONFIG_ALLOC_BLOCK_SIZE));
+
+	/* Initial block size. */
+	tile_alloc_size = 32 * tile_count;
+
+	/*
+	 * The initial allocation gets rounded to the next 256 bytes before
+	 * the hardware starts fulfilling further allocations.
+	 */
+	tile_alloc_size = roundup(tile_alloc_size, 256);
+
+	/* Add space for the extra allocations.  This is what gets used first,
+	 * before overflow memory.  It must have at least 4096 bytes, but we
+	 * want to avoid overflow memory usage if possible.
+	 */
+	tile_alloc_size += 1024 * 1024;
+
+	exec->tile_bo = &vc4_bo_create(dev, exec->tile_alloc_offset +
+				       tile_alloc_size)->base;
+	if (!exec->tile_bo)
+		return -ENOMEM;
+	list_add_tail(&to_vc4_bo(&exec->tile_bo->base)->unref_head,
+		     &exec->unref_list);
+
+	/* tile alloc address. */
+	*(uint32_t *)(validated + 0) = (exec->tile_bo->paddr +
+					exec->tile_alloc_offset);
+	/* tile alloc size. */
+	*(uint32_t *)(validated + 4) = tile_alloc_size;
+	/* tile state address. */
+	*(uint32_t *)(validated + 8) = exec->tile_bo->paddr;
+
+	return 0;
+}
+
+static int
+validate_gem_handles(VALIDATE_ARGS)
+{
+	memcpy(exec->bo_index, untrusted, sizeof(exec->bo_index));
+	return 0;
+}
+
+#define VC4_DEFINE_PACKET(packet, name, func) \
+	[packet] = { packet ## _SIZE, name, func }
+
+static const struct cmd_info {
+	uint16_t len;
+	const char *name;
+	int (*func)(struct vc4_exec_info *exec, void *validated,
+		    void *untrusted);
+} cmd_info[] = {
+	VC4_DEFINE_PACKET(VC4_PACKET_HALT, "halt", NULL),
+	VC4_DEFINE_PACKET(VC4_PACKET_NOP, "nop", NULL),
+	VC4_DEFINE_PACKET(VC4_PACKET_FLUSH, "flush", NULL),
+	VC4_DEFINE_PACKET(VC4_PACKET_FLUSH_ALL, "flush all state", validate_flush_all),
+	VC4_DEFINE_PACKET(VC4_PACKET_START_TILE_BINNING, "start tile binning", validate_start_tile_binning),
+	VC4_DEFINE_PACKET(VC4_PACKET_INCREMENT_SEMAPHORE, "increment semaphore", validate_increment_semaphore),
+
+	VC4_DEFINE_PACKET(VC4_PACKET_GL_INDEXED_PRIMITIVE, "Indexed Primitive List", validate_indexed_prim_list),
+
+	VC4_DEFINE_PACKET(VC4_PACKET_GL_ARRAY_PRIMITIVE, "Vertex Array Primitives", validate_gl_array_primitive),
+
+	/* This is only used by clipped primitives (packets 48 and 49), which
+	 * we don't support parsing yet.
+	 */
+	VC4_DEFINE_PACKET(VC4_PACKET_PRIMITIVE_LIST_FORMAT, "primitive list format", NULL),
+
+	VC4_DEFINE_PACKET(VC4_PACKET_GL_SHADER_STATE, "GL Shader State", validate_gl_shader_state),
+	VC4_DEFINE_PACKET(VC4_PACKET_NV_SHADER_STATE, "NV Shader State", validate_nv_shader_state),
+
+	VC4_DEFINE_PACKET(VC4_PACKET_CONFIGURATION_BITS, "configuration bits", NULL),
+	VC4_DEFINE_PACKET(VC4_PACKET_FLAT_SHADE_FLAGS, "flat shade flags", NULL),
+	VC4_DEFINE_PACKET(VC4_PACKET_POINT_SIZE, "point size", NULL),
+	VC4_DEFINE_PACKET(VC4_PACKET_LINE_WIDTH, "line width", NULL),
+	VC4_DEFINE_PACKET(VC4_PACKET_RHT_X_BOUNDARY, "RHT X boundary", NULL),
+	VC4_DEFINE_PACKET(VC4_PACKET_DEPTH_OFFSET, "Depth Offset", NULL),
+	VC4_DEFINE_PACKET(VC4_PACKET_CLIP_WINDOW, "Clip Window", NULL),
+	VC4_DEFINE_PACKET(VC4_PACKET_VIEWPORT_OFFSET, "Viewport Offset", NULL),
+	VC4_DEFINE_PACKET(VC4_PACKET_CLIPPER_XY_SCALING, "Clipper XY Scaling", NULL),
+	/* Note: The docs say this was also 105, but it was 106 in the
+	 * initial userland code drop.
+	 */
+	VC4_DEFINE_PACKET(VC4_PACKET_CLIPPER_Z_SCALING, "Clipper Z Scale and Offset", NULL),
+
+	VC4_DEFINE_PACKET(VC4_PACKET_TILE_BINNING_MODE_CONFIG, "tile binning configuration", validate_tile_binning_config),
+
+	VC4_DEFINE_PACKET(VC4_PACKET_GEM_HANDLES, "GEM handles", validate_gem_handles),
+};
+
+int
+vc4_validate_bin_cl(struct drm_device *dev,
+		    void *validated,
+		    void *unvalidated,
+		    struct vc4_exec_info *exec)
+{
+	uint32_t len = exec->args->bin_cl_size;
+	uint32_t dst_offset = 0;
+	uint32_t src_offset = 0;
+
+	while (src_offset < len) {
+		void *dst_pkt = validated + dst_offset;
+		void *src_pkt = unvalidated + src_offset;
+		u8 cmd = *(uint8_t *)src_pkt;
+		const struct cmd_info *info;
+
+		if (cmd > ARRAY_SIZE(cmd_info)) {
+			DRM_ERROR("0x%08x: packet %d out of bounds\n",
+				  src_offset, cmd);
+			return -EINVAL;
+		}
+
+		info = &cmd_info[cmd];
+		if (!info->name) {
+			DRM_ERROR("0x%08x: packet %d invalid\n",
+				  src_offset, cmd);
+			return -EINVAL;
+		}
+
+#if 0
+		DRM_INFO("0x%08x: packet %d (%s) size %d processing...\n",
+			 src_offset, cmd, info->name, info->len);
+#endif
+
+		if (src_offset + info->len > len) {
+			DRM_ERROR("0x%08x: packet %d (%s) length 0x%08x "
+				  "exceeds bounds (0x%08x)\n",
+				  src_offset, cmd, info->name, info->len,
+				  src_offset + len);
+			return -EINVAL;
+		}
+
+		if (cmd != VC4_PACKET_GEM_HANDLES)
+			memcpy(dst_pkt, src_pkt, info->len);
+
+		if (info->func && info->func(exec,
+					     dst_pkt + 1,
+					     src_pkt + 1)) {
+			DRM_ERROR("0x%08x: packet %d (%s) failed to "
+				  "validate\n",
+				  src_offset, cmd, info->name);
+			return -EINVAL;
+		}
+
+		src_offset += info->len;
+		/* GEM handle loading doesn't produce HW packets. */
+		if (cmd != VC4_PACKET_GEM_HANDLES)
+			dst_offset += info->len;
+
+		/* When the CL hits halt, it'll stop reading anything else. */
+		if (cmd == VC4_PACKET_HALT)
+			break;
+	}
+
+	exec->ct0ea = exec->ct0ca + dst_offset;
+
+	if (!exec->found_start_tile_binning_packet) {
+		DRM_ERROR("Bin CL missing VC4_PACKET_START_TILE_BINNING\n");
+		return -EINVAL;
+	}
+
+	if (!exec->found_increment_semaphore_packet) {
+		DRM_ERROR("Bin CL missing VC4_PACKET_INCREMENT_SEMAPHORE\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static bool
+reloc_tex(struct vc4_exec_info *exec,
+	  void *uniform_data_u,
+	  struct vc4_texture_sample_info *sample,
+	  uint32_t texture_handle_index)
+
+{
+	struct drm_gem_cma_object *tex;
+	uint32_t p0 = *(uint32_t *)(uniform_data_u + sample->p_offset[0]);
+	uint32_t p1 = *(uint32_t *)(uniform_data_u + sample->p_offset[1]);
+	uint32_t p2 = (sample->p_offset[2] != ~0 ?
+		       *(uint32_t *)(uniform_data_u + sample->p_offset[2]) : 0);
+	uint32_t p3 = (sample->p_offset[3] != ~0 ?
+		       *(uint32_t *)(uniform_data_u + sample->p_offset[3]) : 0);
+	uint32_t *validated_p0 = exec->uniforms_v + sample->p_offset[0];
+	uint32_t offset = p0 & VC4_TEX_P0_OFFSET_MASK;
+	uint32_t miplevels = VC4_GET_FIELD(p0, VC4_TEX_P0_MIPLVLS);
+	uint32_t width = VC4_GET_FIELD(p1, VC4_TEX_P1_WIDTH);
+	uint32_t height = VC4_GET_FIELD(p1, VC4_TEX_P1_HEIGHT);
+	uint32_t cpp, tiling_format, utile_w, utile_h;
+	uint32_t i;
+	uint32_t cube_map_stride = 0;
+	enum vc4_texture_data_type type;
+
+	if (!vc4_use_bo(exec, texture_handle_index, VC4_MODE_RENDER, &tex))
+		return false;
+
+	if (sample->is_direct) {
+		uint32_t remaining_size = tex->base.size - p0;
+		if (p0 > tex->base.size - 4) {
+			DRM_ERROR("UBO offset greater than UBO size\n");
+			goto fail;
+		}
+		if (p1 > remaining_size - 4) {
+			DRM_ERROR("UBO clamp would allow reads outside of UBO\n");
+			goto fail;
+		}
+		*validated_p0 = tex->paddr + p0;
+		return true;
+	}
+
+	if (width == 0)
+		width = 2048;
+	if (height == 0)
+		height = 2048;
+
+	if (p0 & VC4_TEX_P0_CMMODE_MASK) {
+		if (VC4_GET_FIELD(p2, VC4_TEX_P2_PTYPE) ==
+		    VC4_TEX_P2_PTYPE_CUBE_MAP_STRIDE)
+			cube_map_stride = p2 & VC4_TEX_P2_CMST_MASK;
+		if (VC4_GET_FIELD(p3, VC4_TEX_P2_PTYPE) ==
+		    VC4_TEX_P2_PTYPE_CUBE_MAP_STRIDE) {
+			if (cube_map_stride) {
+				DRM_ERROR("Cube map stride set twice\n");
+				goto fail;
+			}
+
+			cube_map_stride = p3 & VC4_TEX_P2_CMST_MASK;
+		}
+		if (!cube_map_stride) {
+			DRM_ERROR("Cube map stride not set\n");
+			goto fail;
+		}
+	}
+
+	type = (VC4_GET_FIELD(p0, VC4_TEX_P0_TYPE) |
+		(VC4_GET_FIELD(p1, VC4_TEX_P1_TYPE4) << 4));
+
+	switch (type) {
+	case VC4_TEXTURE_TYPE_RGBA8888:
+	case VC4_TEXTURE_TYPE_RGBX8888:
+	case VC4_TEXTURE_TYPE_RGBA32R:
+		cpp = 4;
+		break;
+	case VC4_TEXTURE_TYPE_RGBA4444:
+	case VC4_TEXTURE_TYPE_RGBA5551:
+	case VC4_TEXTURE_TYPE_RGB565:
+	case VC4_TEXTURE_TYPE_LUMALPHA:
+	case VC4_TEXTURE_TYPE_S16F:
+	case VC4_TEXTURE_TYPE_S16:
+		cpp = 2;
+		break;
+	case VC4_TEXTURE_TYPE_LUMINANCE:
+	case VC4_TEXTURE_TYPE_ALPHA:
+	case VC4_TEXTURE_TYPE_S8:
+		cpp = 1;
+		break;
+	case VC4_TEXTURE_TYPE_ETC1:
+	case VC4_TEXTURE_TYPE_BW1:
+	case VC4_TEXTURE_TYPE_A4:
+	case VC4_TEXTURE_TYPE_A1:
+	case VC4_TEXTURE_TYPE_RGBA64:
+	case VC4_TEXTURE_TYPE_YUV422R:
+	default:
+		DRM_ERROR("Texture format %d unsupported\n", type);
+		goto fail;
+	}
+	utile_w = utile_width(cpp);
+	utile_h = utile_height(cpp);
+
+	if (type == VC4_TEXTURE_TYPE_RGBA32R) {
+		tiling_format = VC4_TILING_FORMAT_LINEAR;
+	} else {
+		if (size_is_lt(width, height, cpp))
+			tiling_format = VC4_TILING_FORMAT_LT;
+		else
+			tiling_format = VC4_TILING_FORMAT_T;
+	}
+
+	if (!vc4_check_tex_size(exec, tex, offset + cube_map_stride * 5,
+				tiling_format, width, height, cpp)) {
+		goto fail;
+	}
+
+	/* The mipmap levels are stored before the base of the texture.  Make
+	 * sure there is actually space in the BO.
+	 */
+	for (i = 1; i <= miplevels; i++) {
+		uint32_t level_width = max(width >> i, 1u);
+		uint32_t level_height = max(height >> i, 1u);
+		uint32_t aligned_width, aligned_height;
+		uint32_t level_size;
+
+		/* Once the levels get small enough, they drop from T to LT. */
+		if (tiling_format == VC4_TILING_FORMAT_T &&
+		    size_is_lt(level_width, level_height, cpp)) {
+			tiling_format = VC4_TILING_FORMAT_LT;
+		}
+
+		switch (tiling_format) {
+		case VC4_TILING_FORMAT_T:
+			aligned_width = round_up(level_width, utile_w * 8);
+			aligned_height = round_up(level_height, utile_h * 8);
+			break;
+		case VC4_TILING_FORMAT_LT:
+			aligned_width = round_up(level_width, utile_w);
+			aligned_height = round_up(level_height, utile_h);
+			break;
+		default:
+			aligned_width = round_up(level_width, utile_w);
+			aligned_height = level_height;
+			break;
+		}
+
+		level_size = aligned_width * cpp * aligned_height;
+
+		if (offset < level_size) {
+			DRM_ERROR("Level %d (%dx%d -> %dx%d) size %db "
+				  "overflowed buffer bounds (offset %d)\n",
+				  i, level_width, level_height,
+				  aligned_width, aligned_height,
+				  level_size, offset);
+			goto fail;
+		}
+
+		offset -= level_size;
+	}
+
+	*validated_p0 = tex->paddr + p0;
+
+	return true;
+ fail:
+	DRM_INFO("Texture p0 at %d: 0x%08x\n", sample->p_offset[0], p0);
+	DRM_INFO("Texture p1 at %d: 0x%08x\n", sample->p_offset[1], p1);
+	DRM_INFO("Texture p2 at %d: 0x%08x\n", sample->p_offset[2], p2);
+	DRM_INFO("Texture p3 at %d: 0x%08x\n", sample->p_offset[3], p3);
+	return false;
+}
+
+static int
+validate_shader_rec(struct drm_device *dev,
+		    struct vc4_exec_info *exec,
+		    struct vc4_shader_state *state)
+{
+	uint32_t *src_handles;
+	void *pkt_u, *pkt_v;
+	enum shader_rec_reloc_type {
+		RELOC_CODE,
+		RELOC_VBO,
+	};
+	struct shader_rec_reloc {
+		enum shader_rec_reloc_type type;
+		uint32_t offset;
+	};
+	static const struct shader_rec_reloc gl_relocs[] = {
+		{ RELOC_CODE, 4 },  /* fs */
+		{ RELOC_CODE, 16 }, /* vs */
+		{ RELOC_CODE, 28 }, /* cs */
+	};
+	static const struct shader_rec_reloc nv_relocs[] = {
+		{ RELOC_CODE, 4 }, /* fs */
+		{ RELOC_VBO, 12 }
+	};
+	const struct shader_rec_reloc *relocs;
+	struct drm_gem_cma_object *bo[ARRAY_SIZE(gl_relocs) + 8];
+	uint32_t nr_attributes = 0, nr_fixed_relocs, nr_relocs, packet_size;
+	int i;
+	struct vc4_validated_shader_info *validated_shader;
+
+	if (state->packet == VC4_PACKET_NV_SHADER_STATE) {
+		relocs = nv_relocs;
+		nr_fixed_relocs = ARRAY_SIZE(nv_relocs);
+
+		packet_size = 16;
+	} else {
+		relocs = gl_relocs;
+		nr_fixed_relocs = ARRAY_SIZE(gl_relocs);
+
+		nr_attributes = state->addr & 0x7;
+		if (nr_attributes == 0)
+			nr_attributes = 8;
+		packet_size = gl_shader_rec_size(state->addr);
+	}
+	nr_relocs = nr_fixed_relocs + nr_attributes;
+
+	if (nr_relocs * 4 > exec->shader_rec_size) {
+		DRM_ERROR("overflowed shader recs reading %d handles "
+			  "from %d bytes left\n",
+			  nr_relocs, exec->shader_rec_size);
+		return -EINVAL;
+	}
+	src_handles = exec->shader_rec_u;
+	exec->shader_rec_u += nr_relocs * 4;
+	exec->shader_rec_size -= nr_relocs * 4;
+
+	if (packet_size > exec->shader_rec_size) {
+		DRM_ERROR("overflowed shader recs copying %db packet "
+			  "from %d bytes left\n",
+			  packet_size, exec->shader_rec_size);
+		return -EINVAL;
+	}
+	pkt_u = exec->shader_rec_u;
+	pkt_v = exec->shader_rec_v;
+	memcpy(pkt_v, pkt_u, packet_size);
+	exec->shader_rec_u += packet_size;
+	/* Shader recs have to be aligned to 16 bytes (due to the attribute
+	 * flags being in the low bytes), so round the next validated shader
+	 * rec address up.  This should be safe, since we've got so many
+	 * relocations in a shader rec packet.
+	 */
+	BUG_ON(roundup(packet_size, 16) - packet_size > nr_relocs * 4);
+	exec->shader_rec_v += roundup(packet_size, 16);
+	exec->shader_rec_size -= packet_size;
+
+	for (i = 0; i < nr_relocs; i++) {
+		enum vc4_bo_mode mode;
+
+		if (i < nr_fixed_relocs && relocs[i].type == RELOC_CODE)
+			mode = VC4_MODE_SHADER;
+		else
+			mode = VC4_MODE_RENDER;
+
+		if (!vc4_use_bo(exec, src_handles[i], mode, &bo[i])) {
+			return false;
+		}
+	}
+
+	for (i = 0; i < nr_fixed_relocs; i++) {
+		uint32_t o = relocs[i].offset;
+		uint32_t src_offset = *(uint32_t *)(pkt_u + o);
+		uint32_t *texture_handles_u;
+		void *uniform_data_u;
+		uint32_t tex;
+
+		*(uint32_t *)(pkt_v + o) = bo[i]->paddr + src_offset;
+
+		switch (relocs[i].type) {
+		case RELOC_CODE:
+			if (src_offset != 0) {
+				DRM_ERROR("Shaders must be at offset 0 of "
+					  "the BO.\n");
+				goto fail;
+			}
+
+			validated_shader = to_vc4_bo(&bo[i]->base)->validated_shader;
+			if (!validated_shader)
+				goto fail;
+
+			if (validated_shader->uniforms_src_size >
+			    exec->uniforms_size) {
+				DRM_ERROR("Uniforms src buffer overflow\n");
+				goto fail;
+			}
+
+			texture_handles_u = exec->uniforms_u;
+			uniform_data_u = (texture_handles_u +
+					  validated_shader->num_texture_samples);
+
+			memcpy(exec->uniforms_v, uniform_data_u,
+			       validated_shader->uniforms_size);
+
+			for (tex = 0;
+			     tex < validated_shader->num_texture_samples;
+			     tex++) {
+				if (!reloc_tex(exec,
+					       uniform_data_u,
+					       &validated_shader->texture_samples[tex],
+					       texture_handles_u[tex])) {
+					goto fail;
+				}
+			}
+
+			*(uint32_t *)(pkt_v + o + 4) = exec->uniforms_p;
+
+			exec->uniforms_u += validated_shader->uniforms_src_size;
+			exec->uniforms_v += validated_shader->uniforms_size;
+			exec->uniforms_p += validated_shader->uniforms_size;
+
+			break;
+
+		case RELOC_VBO:
+			break;
+		}
+	}
+
+	for (i = 0; i < nr_attributes; i++) {
+		struct drm_gem_cma_object *vbo = bo[nr_fixed_relocs + i];
+		uint32_t o = 36 + i * 8;
+		uint32_t offset = *(uint32_t *)(pkt_u + o + 0);
+		uint32_t attr_size = *(uint8_t *)(pkt_u + o + 4) + 1;
+		uint32_t stride = *(uint8_t *)(pkt_u + o + 5);
+		uint32_t max_index;
+
+		if (state->addr & 0x8)
+			stride |= (*(uint32_t *)(pkt_u + 100 + i * 4)) & ~0xff;
+
+		if (vbo->base.size < offset ||
+		    vbo->base.size - offset < attr_size) {
+			DRM_ERROR("BO offset overflow (%d + %d > %d)\n",
+				  offset, attr_size, vbo->base.size);
+			return -EINVAL;
+		}
+
+		if (stride != 0) {
+			max_index = ((vbo->base.size - offset - attr_size) /
+				     stride);
+			if (state->max_index > max_index) {
+				DRM_ERROR("primitives use index %d out of supplied %d\n",
+					  state->max_index, max_index);
+				return -EINVAL;
+			}
+		}
+
+		*(uint32_t *)(pkt_v + o) = vbo->paddr + offset;
+	}
+
+	return 0;
+
+fail:
+	return -EINVAL;
+}
+
+int
+vc4_validate_shader_recs(struct drm_device *dev,
+			 struct vc4_exec_info *exec)
+{
+	uint32_t i;
+	int ret = 0;
+
+	for (i = 0; i < exec->shader_state_count; i++) {
+		ret = validate_shader_rec(dev, exec, &exec->shader_state[i]);
+		if (ret)
+			return ret;
+	}
+
+	return ret;
+}

drivers/gpu/drm/vc4/vc4_validate_shaders.c

@@ -0,0 +1,521 @@
+/*
+ * Copyright © 2014 Broadcom
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/**
+ * DOC: Shader validator for VC4.
+ *
+ * The VC4 has no IOMMU between it and system memory.  So, a user with access
+ * to execute shaders could escalate privilege by overwriting system memory
+ * (using the VPM write address register in the general-purpose DMA mode) or
+ * reading system memory it shouldn't (reading it as a texture, or uniform
+ * data, or vertex data).
+ *
+ * This walks over a shader starting from some offset within a BO, ensuring
+ * that its accesses are appropriately bounded, and recording how many texture
+ * accesses are made and where so that we can do relocations for them in the
+ * uniform stream.
+ *
+ * The kernel API has shaders stored in user-mapped BOs.  The BOs will be
+ * forcibly unmapped from the process before validation, and any cache of
+ * validated state will be flushed if the mapping is faulted back in.
+ *
+ * Storing the shaders in BOs means that the validation process will be slow
+ * due to uncached reads, but since shaders are long-lived and shader BOs are
+ * never actually modified, this shouldn't be a problem.
+ */
+
+#include "vc4_drv.h"
+#include "vc4_qpu_defines.h"
+
+struct vc4_shader_validation_state {
+	struct vc4_texture_sample_info tmu_setup[2];
+	int tmu_write_count[2];
+
+	/* For registers that were last written to by a MIN instruction with
+	 * one argument being a uniform, the address of the uniform.
+	 * Otherwise, ~0.
+	 *
+	 * This is used for the validation of direct address memory reads.
+	 */
+	uint32_t live_min_clamp_offsets[32 + 32 + 4];
+	bool live_max_clamp_regs[32 + 32 + 4];
+};
+
+static uint32_t
+waddr_to_live_reg_index(uint32_t waddr, bool is_b)
+{
+	if (waddr < 32) {
+		if (is_b)
+			return 32 + waddr;
+		else
+			return waddr;
+	} else if (waddr <= QPU_W_ACC3) {
+
+		return 64 + waddr - QPU_W_ACC0;
+	} else {
+		return ~0;
+	}
+}
+
+static uint32_t
+raddr_add_a_to_live_reg_index(uint64_t inst)
+{
+	uint32_t sig = QPU_GET_FIELD(inst, QPU_SIG);
+	uint32_t add_a = QPU_GET_FIELD(inst, QPU_ADD_A);
+	uint32_t raddr_a = QPU_GET_FIELD(inst, QPU_RADDR_A);
+	uint32_t raddr_b = QPU_GET_FIELD(inst, QPU_RADDR_B);
+
+	if (add_a == QPU_MUX_A) {
+		return raddr_a;
+	} else if (add_a == QPU_MUX_B && sig != QPU_SIG_SMALL_IMM) {
+		return 32 + raddr_b;
+	} else if (add_a <= QPU_MUX_R3) {
+		return 64 + add_a;
+	} else {
+		return ~0;
+	}
+}
+
+static bool
+is_tmu_submit(uint32_t waddr)
+{
+	return (waddr == QPU_W_TMU0_S ||
+		waddr == QPU_W_TMU1_S);
+}
+
+static bool
+is_tmu_write(uint32_t waddr)
+{
+	return (waddr >= QPU_W_TMU0_S &&
+		waddr <= QPU_W_TMU1_B);
+}
+
+static bool
+record_validated_texture_sample(struct vc4_validated_shader_info *validated_shader,
+				struct vc4_shader_validation_state *validation_state,
+				int tmu)
+{
+	uint32_t s = validated_shader->num_texture_samples;
+	int i;
+	struct vc4_texture_sample_info *temp_samples;
+
+	temp_samples = krealloc(validated_shader->texture_samples,
+				(s + 1) * sizeof(*temp_samples),
+				GFP_KERNEL);
+	if (!temp_samples)
+		return false;
+
+	memcpy(&temp_samples[s],
+	       &validation_state->tmu_setup[tmu],
+	       sizeof(*temp_samples));
+
+	validated_shader->num_texture_samples = s + 1;
+	validated_shader->texture_samples = temp_samples;
+
+	for (i = 0; i < 4; i++)
+		validation_state->tmu_setup[tmu].p_offset[i] = ~0;
+
+	return true;
+}
+
+static bool
+check_tmu_write(uint64_t inst,
+		struct vc4_validated_shader_info *validated_shader,
+		struct vc4_shader_validation_state *validation_state,
+		bool is_mul)
+{
+	uint32_t waddr = (is_mul ?
+			  QPU_GET_FIELD(inst, QPU_WADDR_MUL) :
+			  QPU_GET_FIELD(inst, QPU_WADDR_ADD));
+	uint32_t raddr_a = QPU_GET_FIELD(inst, QPU_RADDR_A);
+	uint32_t raddr_b = QPU_GET_FIELD(inst, QPU_RADDR_B);
+	int tmu = waddr > QPU_W_TMU0_B;
+	bool submit = is_tmu_submit(waddr);
+	bool is_direct = submit && validation_state->tmu_write_count[tmu] == 0;
+	uint32_t sig = QPU_GET_FIELD(inst, QPU_SIG);
+
+	if (is_direct) {
+		uint32_t add_b = QPU_GET_FIELD(inst, QPU_ADD_B);
+		uint32_t clamp_reg, clamp_offset;
+
+		if (sig == QPU_SIG_SMALL_IMM) {
+			DRM_ERROR("direct TMU read used small immediate\n");
+			return false;
+		}
+
+		/* Make sure that this texture load is an add of the base
+		 * address of the UBO to a clamped offset within the UBO.
+		 */
+		if (is_mul ||
+		    QPU_GET_FIELD(inst, QPU_OP_ADD) != QPU_A_ADD) {
+			DRM_ERROR("direct TMU load wasn't an add\n");
+			return false;
+		}
+
+		/* We assert that the the clamped address is the first
+		 * argument, and the UBO base address is the second argument.
+		 * This is arbitrary, but simpler than supporting flipping the
+		 * two either way.
+		 */
+		clamp_reg = raddr_add_a_to_live_reg_index(inst);
+		if (clamp_reg == ~0) {
+			DRM_ERROR("direct TMU load wasn't clamped\n");
+			return false;
+		}
+
+		clamp_offset = validation_state->live_min_clamp_offsets[clamp_reg];
+		if (clamp_offset == ~0) {
+			DRM_ERROR("direct TMU load wasn't clamped\n");
+			return false;
+		}
+
+		/* Store the clamp value's offset in p1 (see reloc_tex() in
+		 * vc4_validate.c).
+		 */
+		validation_state->tmu_setup[tmu].p_offset[1] =
+			clamp_offset;
+
+		if (!(add_b == QPU_MUX_A && raddr_a == QPU_R_UNIF) &&
+		    !(add_b == QPU_MUX_B && raddr_b == QPU_R_UNIF)) {
+			DRM_ERROR("direct TMU load didn't add to a uniform\n");
+			return false;
+		}
+
+		validation_state->tmu_setup[tmu].is_direct = true;
+	} else {
+		if (raddr_a == QPU_R_UNIF || (sig != QPU_SIG_SMALL_IMM &&
+					      raddr_b == QPU_R_UNIF)) {
+			DRM_ERROR("uniform read in the same instruction as "
+				  "texture setup.\n");
+			return false;
+		}
+	}
+
+	if (validation_state->tmu_write_count[tmu] >= 4) {
+		DRM_ERROR("TMU%d got too many parameters before dispatch\n",
+			  tmu);
+		return false;
+	}
+	validation_state->tmu_setup[tmu].p_offset[validation_state->tmu_write_count[tmu]] =
+		validated_shader->uniforms_size;
+	validation_state->tmu_write_count[tmu]++;
+	/* Since direct uses a RADDR uniform reference, it will get counted in
+	 * check_instruction_reads()
+	 */
+	if (!is_direct)
+		validated_shader->uniforms_size += 4;
+
+	if (submit) {
+		if (!record_validated_texture_sample(validated_shader,
+						     validation_state, tmu)) {
+			return false;
+		}
+
+		validation_state->tmu_write_count[tmu] = 0;
+	}
+
+	return true;
+}
+
+static bool
+check_register_write(uint64_t inst,
+		     struct vc4_validated_shader_info *validated_shader,
+		     struct vc4_shader_validation_state *validation_state,
+		     bool is_mul)
+{
+	uint32_t waddr = (is_mul ?
+			  QPU_GET_FIELD(inst, QPU_WADDR_MUL) :
+			  QPU_GET_FIELD(inst, QPU_WADDR_ADD));
+
+	switch (waddr) {
+	case QPU_W_UNIFORMS_ADDRESS:
+		/* XXX: We'll probably need to support this for reladdr, but
+		 * it's definitely a security-related one.
+		 */
+		DRM_ERROR("uniforms address load unsupported\n");
+		return false;
+
+	case QPU_W_TLB_COLOR_MS:
+	case QPU_W_TLB_COLOR_ALL:
+	case QPU_W_TLB_Z:
+		/* These only interact with the tile buffer, not main memory,
+		 * so they're safe.
+		 */
+		return true;
+
+	case QPU_W_TMU0_S:
+	case QPU_W_TMU0_T:
+	case QPU_W_TMU0_R:
+	case QPU_W_TMU0_B:
+	case QPU_W_TMU1_S:
+	case QPU_W_TMU1_T:
+	case QPU_W_TMU1_R:
+	case QPU_W_TMU1_B:
+		return check_tmu_write(inst, validated_shader, validation_state,
+				       is_mul);
+
+	case QPU_W_HOST_INT:
+	case QPU_W_TMU_NOSWAP:
+	case QPU_W_TLB_ALPHA_MASK:
+	case QPU_W_MUTEX_RELEASE:
+		/* XXX: I haven't thought about these, so don't support them
+		 * for now.
+		 */
+		DRM_ERROR("Unsupported waddr %d\n", waddr);
+		return false;
+
+	case QPU_W_VPM_ADDR:
+		DRM_ERROR("General VPM DMA unsupported\n");
+		return false;
+
+	case QPU_W_VPM:
+	case QPU_W_VPMVCD_SETUP:
+		/* We allow VPM setup in general, even including VPM DMA
+		 * configuration setup, because the (unsafe) DMA can only be
+		 * triggered by QPU_W_VPM_ADDR writes.
+		 */
+		return true;
+
+	case QPU_W_TLB_STENCIL_SETUP:
+                return true;
+	}
+
+	return true;
+}
+
+static void
+track_live_clamps(uint64_t inst,
+		  struct vc4_validated_shader_info *validated_shader,
+		  struct vc4_shader_validation_state *validation_state)
+{
+	uint32_t op_add = QPU_GET_FIELD(inst, QPU_OP_ADD);
+	uint32_t waddr_add = QPU_GET_FIELD(inst, QPU_WADDR_ADD);
+	uint32_t waddr_mul = QPU_GET_FIELD(inst, QPU_WADDR_MUL);
+	uint32_t cond_add = QPU_GET_FIELD(inst, QPU_COND_ADD);
+	uint32_t add_a = QPU_GET_FIELD(inst, QPU_ADD_A);
+	uint32_t add_b = QPU_GET_FIELD(inst, QPU_ADD_B);
+	uint32_t raddr_a = QPU_GET_FIELD(inst, QPU_RADDR_A);
+	uint32_t raddr_b = QPU_GET_FIELD(inst, QPU_RADDR_B);
+	uint32_t sig = QPU_GET_FIELD(inst, QPU_SIG);
+	bool ws = inst & QPU_WS;
+	uint32_t lri_add_a, lri_add, lri_mul;
+	bool add_a_is_min_0;
+
+	/* Check whether OP_ADD's A argumennt comes from a live MAX(x, 0),
+	 * before we clear previous live state.
+	 */
+	lri_add_a = raddr_add_a_to_live_reg_index(inst);
+	add_a_is_min_0 = (lri_add_a != ~0 &&
+			  validation_state->live_max_clamp_regs[lri_add_a]);
+
+	/* Clear live state for registers written by our instruction. */
+	lri_add = waddr_to_live_reg_index(waddr_add, ws);
+	lri_mul = waddr_to_live_reg_index(waddr_mul, !ws);
+	if (lri_mul != ~0) {
+		validation_state->live_max_clamp_regs[lri_mul] = false;
+		validation_state->live_min_clamp_offsets[lri_mul] = ~0;
+	}
+	if (lri_add != ~0) {
+		validation_state->live_max_clamp_regs[lri_add] = false;
+		validation_state->live_min_clamp_offsets[lri_add] = ~0;
+	} else {
+		/* Nothing further to do for live tracking, since only ADDs
+		 * generate new live clamp registers.
+		 */
+		return;
+	}
+
+	/* Now, handle remaining live clamp tracking for the ADD operation. */
+
+	if (cond_add != QPU_COND_ALWAYS)
+		return;
+
+	if (op_add == QPU_A_MAX) {
+		/* Track live clamps of a value to a minimum of 0 (in either
+		 * arg).
+		 */
+		if (sig != QPU_SIG_SMALL_IMM || raddr_b != 0 ||
+		    (add_a != QPU_MUX_B && add_b != QPU_MUX_B)) {
+			return;
+		}
+
+		validation_state->live_max_clamp_regs[lri_add] = true;
+	} if (op_add == QPU_A_MIN) {
+		/* Track live clamps of a value clamped to a minimum of 0 and
+		 * a maximum of some uniform's offset.
+		 */
+		if (!add_a_is_min_0)
+			return;
+
+		if (!(add_b == QPU_MUX_A && raddr_a == QPU_R_UNIF) &&
+		    !(add_b == QPU_MUX_B && raddr_b == QPU_R_UNIF &&
+		      sig != QPU_SIG_SMALL_IMM)) {
+			return;
+		}
+
+		validation_state->live_min_clamp_offsets[lri_add] =
+			validated_shader->uniforms_size;
+	}
+}
+
+static bool
+check_instruction_writes(uint64_t inst,
+			 struct vc4_validated_shader_info *validated_shader,
+			 struct vc4_shader_validation_state *validation_state)
+{
+	uint32_t waddr_add = QPU_GET_FIELD(inst, QPU_WADDR_ADD);
+	uint32_t waddr_mul = QPU_GET_FIELD(inst, QPU_WADDR_MUL);
+	bool ok;
+
+	if (is_tmu_write(waddr_add) && is_tmu_write(waddr_mul)) {
+		DRM_ERROR("ADD and MUL both set up textures\n");
+		return false;
+	}
+
+	ok = (check_register_write(inst, validated_shader, validation_state, false) &&
+	      check_register_write(inst, validated_shader, validation_state, true));
+
+	track_live_clamps(inst, validated_shader, validation_state);
+
+	return ok;
+}
+
+static bool
+check_instruction_reads(uint64_t inst,
+			struct vc4_validated_shader_info *validated_shader)
+{
+	uint32_t raddr_a = QPU_GET_FIELD(inst, QPU_RADDR_A);
+	uint32_t raddr_b = QPU_GET_FIELD(inst, QPU_RADDR_B);
+	uint32_t sig = QPU_GET_FIELD(inst, QPU_SIG);
+
+	if (raddr_a == QPU_R_UNIF ||
+	    (raddr_b == QPU_R_UNIF && sig != QPU_SIG_SMALL_IMM)) {
+		/* This can't overflow the uint32_t, because we're reading 8
+		 * bytes of instruction to increment by 4 here, so we'd
+		 * already be OOM.
+		 */
+		validated_shader->uniforms_size += 4;
+	}
+
+	return true;
+}
+
+struct vc4_validated_shader_info *
+vc4_validate_shader(struct drm_gem_cma_object *shader_obj)
+{
+	bool found_shader_end = false;
+	int shader_end_ip = 0;
+	uint32_t ip, max_ip;
+	uint64_t *shader;
+	struct vc4_validated_shader_info *validated_shader;
+	struct vc4_shader_validation_state validation_state;
+	int i;
+
+	memset(&validation_state, 0, sizeof(validation_state));
+
+	for (i = 0; i < 8; i++)
+		validation_state.tmu_setup[i / 4].p_offset[i % 4] = ~0;
+	for (i = 0; i < ARRAY_SIZE(validation_state.live_min_clamp_offsets); i++)
+		validation_state.live_min_clamp_offsets[i] = ~0;
+
+	shader = shader_obj->vaddr;
+	max_ip = shader_obj->base.size / sizeof(uint64_t);
+
+	validated_shader = kcalloc(sizeof(*validated_shader), 1, GFP_KERNEL);
+	if (!validated_shader)
+		return NULL;
+
+	for (ip = 0; ip < max_ip; ip++) {
+		uint64_t inst = shader[ip];
+		uint32_t sig = QPU_GET_FIELD(inst, QPU_SIG);
+
+		switch (sig) {
+		case QPU_SIG_NONE:
+		case QPU_SIG_WAIT_FOR_SCOREBOARD:
+		case QPU_SIG_SCOREBOARD_UNLOCK:
+		case QPU_SIG_COLOR_LOAD:
+		case QPU_SIG_LOAD_TMU0:
+		case QPU_SIG_LOAD_TMU1:
+		case QPU_SIG_PROG_END:
+		case QPU_SIG_SMALL_IMM:
+			if (!check_instruction_writes(inst, validated_shader,
+						      &validation_state)) {
+				DRM_ERROR("Bad write at ip %d\n", ip);
+				goto fail;
+			}
+
+			if (!check_instruction_reads(inst, validated_shader))
+				goto fail;
+
+			if (sig == QPU_SIG_PROG_END) {
+				found_shader_end = true;
+				shader_end_ip = ip;
+			}
+
+			break;
+
+		case QPU_SIG_LOAD_IMM:
+			if (!check_instruction_writes(inst, validated_shader,
+						      &validation_state)) {
+				DRM_ERROR("Bad LOAD_IMM write at ip %d\n", ip);
+				goto fail;
+			}
+			break;
+
+		default:
+			DRM_ERROR("Unsupported QPU signal %d at "
+				  "instruction %d\n", sig, ip);
+			goto fail;
+		}
+
+		/* There are two delay slots after program end is signaled
+		 * that are still executed, then we're finished.
+		 */
+		if (found_shader_end && ip == shader_end_ip + 2)
+			break;
+	}
+
+	if (ip == max_ip) {
+		DRM_ERROR("shader failed to terminate before "
+			  "shader BO end at %d\n",
+			  shader_obj->base.size);
+		goto fail;
+	}
+
+	/* Again, no chance of integer overflow here because the worst case
+	 * scenario is 8 bytes of uniforms plus handles per 8-byte
+	 * instruction.
+	 */
+	validated_shader->uniforms_src_size =
+		(validated_shader->uniforms_size +
+		 4 * validated_shader->num_texture_samples);
+
+	return validated_shader;
+
+fail:
+	if (validated_shader) {
+		kfree(validated_shader->texture_samples);
+		kfree(validated_shader);
+	}
+	return NULL;
+}

include/uapi/drm/vc4_drm.h

@@ -0,0 +1,229 @@
+/*
+ * Copyright © 2014-2015 Broadcom
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef _UAPI_VC4_DRM_H_
+#define _UAPI_VC4_DRM_H_
+
+#include <drm/drm.h>
+
+#define DRM_VC4_SUBMIT_CL                         0x00
+#define DRM_VC4_WAIT_SEQNO                        0x01
+#define DRM_VC4_WAIT_BO                           0x02
+#define DRM_VC4_CREATE_BO                         0x03
+#define DRM_VC4_MMAP_BO                           0x04
+#define DRM_VC4_CREATE_SHADER_BO                  0x05
+
+#define DRM_IOCTL_VC4_SUBMIT_CL           DRM_IOWR( DRM_COMMAND_BASE + DRM_VC4_SUBMIT_CL, struct drm_vc4_submit_cl)
+#define DRM_IOCTL_VC4_WAIT_SEQNO          DRM_IOWR( DRM_COMMAND_BASE + DRM_VC4_WAIT_SEQNO, struct drm_vc4_wait_seqno)
+#define DRM_IOCTL_VC4_WAIT_BO             DRM_IOWR( DRM_COMMAND_BASE + DRM_VC4_WAIT_BO, struct drm_vc4_wait_bo)
+#define DRM_IOCTL_VC4_CREATE_BO           DRM_IOWR( DRM_COMMAND_BASE + DRM_VC4_CREATE_BO, struct drm_vc4_create_bo)
+#define DRM_IOCTL_VC4_MMAP_BO             DRM_IOWR( DRM_COMMAND_BASE + DRM_VC4_MMAP_BO, struct drm_vc4_mmap_bo)
+#define DRM_IOCTL_VC4_CREATE_SHADER_BO    DRM_IOWR( DRM_COMMAND_BASE + DRM_VC4_CREATE_SHADER_BO, struct drm_vc4_create_shader_bo)
+
+struct drm_vc4_submit_rcl_surface {
+	uint32_t hindex; /* Handle index, or ~0 if not present. */
+	uint32_t offset; /* Offset to start of buffer. */
+	/*
+         * Bits for either render config (color_ms_write) or load/store packet.
+	 */
+	uint16_t bits;
+	uint16_t pad;
+};
+
+/**
+ * struct drm_vc4_submit_cl - ioctl argument for submitting commands to the 3D
+ * engine.
+ *
+ * Drivers typically use GPU BOs to store batchbuffers / command lists and
+ * their associated state.  However, because the VC4 lacks an MMU, we have to
+ * do validation of memory accesses by the GPU commands.  If we were to store
+ * our commands in BOs, we'd need to do uncached readback from them to do the
+ * validation process, which is too expensive.  Instead, userspace accumulates
+ * commands and associated state in plain memory, then the kernel copies the
+ * data to its own address space, and then validates and stores it in a GPU
+ * BO.
+ */
+struct drm_vc4_submit_cl {
+	/* Pointer to the binner command list.
+	 *
+	 * This is the first set of commands executed, which runs the
+	 * coordinate shader to determine where primitives land on the screen,
+	 * then writes out the state updates and draw calls necessary per tile
+	 * to the tile allocation BO.
+	 */
+	uint64_t bin_cl;
+
+	/* Pointer to the shader records.
+	 *
+	 * Shader records are the structures read by the hardware that contain
+	 * pointers to uniforms, shaders, and vertex attributes.  The
+	 * reference to the shader record has enough information to determine
+	 * how many pointers are necessary (fixed number for shaders/uniforms,
+	 * and an attribute count), so those BO indices into bo_handles are
+	 * just stored as uint32_ts before each shader record passed in.
+	 */
+	uint64_t shader_rec;
+
+	/* Pointer to uniform data and texture handles for the textures
+	 * referenced by the shader.
+	 *
+	 * For each shader state record, there is a set of uniform data in the
+	 * order referenced by the record (FS, VS, then CS).  Each set of
+	 * uniform data has a uint32_t index into bo_handles per texture
+	 * sample operation, in the order the QPU_W_TMUn_S writes appear in
+	 * the program.  Following the texture BO handle indices is the actual
+	 * uniform data.
+	 *
+	 * The individual uniform state blocks don't have sizes passed in,
+	 * because the kernel has to determine the sizes anyway during shader
+	 * code validation.
+	 */
+	uint64_t uniforms;
+	uint64_t bo_handles;
+
+	/* Size in bytes of the binner command list. */
+	uint32_t bin_cl_size;
+	/* Size in bytes of the set of shader records. */
+	uint32_t shader_rec_size;
+	/* Number of shader records.
+	 *
+	 * This could just be computed from the contents of shader_records and
+	 * the address bits of references to them from the bin CL, but it
+	 * keeps the kernel from having to resize some allocations it makes.
+	 */
+	uint32_t shader_rec_count;
+	/* Size in bytes of the uniform state. */
+	uint32_t uniforms_size;
+
+	/* Number of BO handles passed in (size is that times 4). */
+	uint32_t bo_handle_count;
+
+	/* RCL setup: */
+	uint16_t width;
+	uint16_t height;
+	uint8_t min_x_tile;
+	uint8_t min_y_tile;
+	uint8_t max_x_tile;
+	uint8_t max_y_tile;
+	struct drm_vc4_submit_rcl_surface color_read;
+	struct drm_vc4_submit_rcl_surface color_ms_write;
+	struct drm_vc4_submit_rcl_surface zs_read;
+	struct drm_vc4_submit_rcl_surface zs_write;
+	uint32_t clear_color[2];
+	uint32_t clear_z;
+	uint8_t clear_s;
+
+	uint32_t pad:24;
+
+#define VC4_SUBMIT_CL_USE_CLEAR_COLOR			(1 << 0)
+	uint32_t flags;
+
+	/* Returned value of the seqno of this render job (for the
+	 * wait ioctl).
+	 */
+	uint64_t seqno;
+};
+
+/**
+ * struct drm_vc4_wait_seqno - ioctl argument for waiting for
+ * DRM_VC4_SUBMIT_CL completion using its returned seqno.
+ *
+ * timeout_ns is the timeout in nanoseconds, where "0" means "don't
+ * block, just return the status."
+ */
+struct drm_vc4_wait_seqno {
+	uint64_t seqno;
+	uint64_t timeout_ns;
+};
+
+/**
+ * struct drm_vc4_wait_bo - ioctl argument for waiting for
+ * completion of the last DRM_VC4_SUBMIT_CL on a BO.
+ *
+ * This is useful for cases where multiple processes might be
+ * rendering to a BO and you want to wait for all rendering to be
+ * completed.
+ */
+struct drm_vc4_wait_bo {
+	uint32_t handle;
+	uint32_t pad;
+	uint64_t timeout_ns;
+};
+
+/**
+ * struct drm_vc4_create_bo - ioctl argument for creating VC4 BOs.
+ *
+ * There are currently no values for the flags argument, but it may be
+ * used in a future extension.
+ */
+struct drm_vc4_create_bo {
+	uint32_t size;
+	uint32_t flags;
+	/** Returned GEM handle for the BO. */
+	uint32_t handle;
+	uint32_t pad;
+};
+
+/**
+ * struct drm_vc4_create_shader_bo - ioctl argument for creating VC4
+ * shader BOs.
+ *
+ * Since allowing a shader to be overwritten while it's also being
+ * executed from would allow privlege escalation, shaders must be
+ * created using this ioctl, and they can't be mmapped later.
+ */
+struct drm_vc4_create_shader_bo {
+	/* Size of the data argument. */
+	uint32_t size;
+	/* Flags, currently must be 0. */
+	uint32_t flags;
+
+	/* Pointer to the data. */
+	uint64_t data;
+
+	/** Returned GEM handle for the BO. */
+	uint32_t handle;
+	/* Pad, must be 0. */
+	uint32_t pad;
+};
+
+/**
+ * struct drm_vc4_mmap_bo - ioctl argument for mapping VC4 BOs.
+ *
+ * This doesn't actually perform an mmap.  Instead, it returns the
+ * offset you need to use in an mmap on the DRM device node.  This
+ * means that tools like valgrind end up knowing about the mapped
+ * memory.
+ *
+ * There are currently no values for the flags argument, but it may be
+ * used in a future extension.
+ */
+struct drm_vc4_mmap_bo {
+	/** Handle for the object being mapped. */
+	uint32_t handle;
+	uint32_t flags;
+	/** offset into the drm node to use for subsequent mmap call. */
+	uint64_t offset;
+};
+
+#endif /* _UAPI_VC4_DRM_H_ */