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drm/panthor: Serialize GPU cache flush operations

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In certain scenarios, it is possible for multiple cache flushes to be
requested before the previous one completes. This patch introduces the
cache_flush_lock mutex to serialize these operations and ensure that
any requested cache flushes are completed instead of dropped.

Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Co-developed-by: Dennis Tsiang <dennis.tsiang@arm.com>
Signed-off-by: Dennis Tsiang <dennis.tsiang@arm.com>
Signed-off-by: Karunika Choo <karunika.choo@arm.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Link: https://lore.kernel.org/r/20250807162633.3666310-6-karunika.choo@arm.com
This commit is contained in:
Karunika Choo
2025-08-07 17:26:31 +01:00
committed by Steven Price
parent 3b1dc21d6d
commit e322a48448
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/panthor/panthor_gpu.c
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@@ -35,6 +35,9 @@ struct panthor_gpu {
/** @reqs_acked: GPU request wait queue. */
wait_queue_head_t reqs_acked;
/** @cache_flush_lock: Lock to serialize cache flushes */
struct mutex cache_flush_lock;
};
#define GPU_INTERRUPTS_MASK \
@@ -110,6 +113,7 @@ int panthor_gpu_init(struct panthor_device *ptdev)
spin_lock_init(&gpu->reqs_lock);
init_waitqueue_head(&gpu->reqs_acked);
mutex_init(&gpu->cache_flush_lock);
ptdev->gpu = gpu;
dma_set_max_seg_size(ptdev->base.dev, UINT_MAX);
@@ -258,6 +262,9 @@ int panthor_gpu_flush_caches(struct panthor_device *ptdev,
bool timedout = false;
unsigned long flags;
/* Serialize cache flush operations. */
guard(mutex)(&ptdev->gpu->cache_flush_lock);
spin_lock_irqsave(&ptdev->gpu->reqs_lock, flags);
if (!drm_WARN_ON(&ptdev->base,
ptdev->gpu->pending_reqs & GPU_IRQ_CLEAN_CACHES_COMPLETED)) {