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bcm2708_fb: report number of dma copies

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Add a counter (exported via debugfs) reporting the
number of dma copies that the framebuffer driver
has done, in order to help evaluate different
optimization strategies.

Signed-off-by: Luke Diamand <luked@broadcom.com>
This commit is contained in:
Luke Diamand
2013-12-31 23:07:36 +00:00
parent c43739885d
commit 19b51d3db5
1 changed files with 55 additions and 0 deletions
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55
drivers/video/bcm2708_fb.c
View File

@@ -27,6 +27,7 @@
#include <linux/clk.h>
#include <linux/printk.h>
#include <linux/console.h>
#include <linux/debugfs.h>
#include <mach/dma.h>
#include <mach/platform.h>
@@ -58,6 +59,12 @@ struct fbinfo_s {
u16 cmap[256];
};
struct bcm2708_fb_stats {
struct debugfs_regset32 regset;
u32 dma_copies;
u32 dma_irqs;
};
struct bcm2708_fb {
struct fb_info fb;
struct platform_device *dev;
@@ -69,10 +76,51 @@ struct bcm2708_fb {
void __iomem *dma_chan_base;
void *cb_base; /* DMA control blocks */
dma_addr_t cb_handle;
struct dentry *debugfs_dir;
struct bcm2708_fb_stats stats;
};
#define to_bcm2708(info) container_of(info, struct bcm2708_fb, fb)
static void bcm2708_fb_debugfs_deinit(struct bcm2708_fb *fb)
{
debugfs_remove_recursive(fb->debugfs_dir);
fb->debugfs_dir = NULL;
}
static int bcm2708_fb_debugfs_init(struct bcm2708_fb *fb)
{
static struct debugfs_reg32 stats_registers[] = {
{
"dma_copies",
offsetof(struct bcm2708_fb_stats, dma_copies)
},
};
fb->debugfs_dir = debugfs_create_dir(DRIVER_NAME, NULL);
if (!fb->debugfs_dir) {
pr_warn("%s: could not create debugfs entry\n",
__func__);
return -EFAULT;
}
fb->stats.regset.regs = stats_registers;
fb->stats.regset.nregs = ARRAY_SIZE(stats_registers);
fb->stats.regset.base = &fb->stats;
if (!debugfs_create_regset32(
"stats", 0444, fb->debugfs_dir, &fb->stats.regset)) {
pr_warn("%s: could not create statistics registers\n",
__func__);
goto fail;
}
return 0;
fail:
bcm2708_fb_debugfs_deinit(fb);
return -EFAULT;
}
static int bcm2708_fb_set_bitfields(struct fb_var_screeninfo *var)
{
int ret = 0;
@@ -443,8 +491,10 @@ static void bcm2708_fb_copyarea(struct fb_info *info,
/* end of dma control blocks chain */
cb->next = 0;
bcm_dma_start(fb->dma_chan_base, fb->cb_handle);
bcm_dma_wait_idle(fb->dma_chan_base);
fb->stats.dma_copies++;
}
static void bcm2708_fb_imageblit(struct fb_info *info,
@@ -552,6 +602,9 @@ static int bcm2708_fb_probe(struct platform_device *dev)
}
memset(fb, 0, sizeof(struct bcm2708_fb));
bcm2708_fb_debugfs_init(fb);
fb->cb_base = dma_alloc_writecombine(&dev->dev, SZ_64K,
&fb->cb_handle, GFP_KERNEL);
if (!fb->cb_base) {
@@ -607,6 +660,8 @@ static int bcm2708_fb_remove(struct platform_device *dev)
dma_free_coherent(NULL, PAGE_ALIGN(sizeof(*fb->info)), (void *)fb->info,
fb->dma);
bcm2708_fb_debugfs_deinit(fb);
kfree(fb);
return 0;