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drm/msm: Handle fence rollover

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Add some helpers for fence comparision, which handle rollover properly,
and stop open coding fence seqno comparisions.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Akhil P Oommen <akhilpo@codeaurora.org>
Link: https://lore.kernel.org/r/20211109181117.591148-5-robdclark@gmail.com
Signed-off-by: Rob Clark <robdclark@chromium.org>
This commit is contained in:
Rob Clark 2021-11-09 10:11:04 -08:00
parent c28e2f2b41
commit 5f3aee4ceb
4 changed files with 17 additions and 5 deletions
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2
drivers/gpu/drm/msm/msm_drv.c
View file

@ -967,7 +967,7 @@ static int wait_fence(struct msm_gpu_submitqueue *queue, uint32_t fence_id,
struct dma_fence *fence;
int ret;
if (fence_id > queue->last_fence) {
if (fence_after(fence_id, queue->last_fence)) {
DRM_ERROR_RATELIMITED("waiting on invalid fence: %u (of %u)\n",
fence_id, queue->last_fence);
return -EINVAL;

12
drivers/gpu/drm/msm/msm_fence.h
View file

@ -60,4 +60,16 @@ void msm_update_fence(struct msm_fence_context *fctx, uint32_t fence);
struct dma_fence * msm_fence_alloc(struct msm_fence_context *fctx);
static inline bool
fence_before(uint32_t a, uint32_t b)
{
return (int32_t)(a - b) < 0;
}
static inline bool
fence_after(uint32_t a, uint32_t b)
{
return (int32_t)(a - b) > 0;
}
#endif

6
drivers/gpu/drm/msm/msm_gpu.c
View file

@ -172,7 +172,7 @@ static void update_fences(struct msm_gpu *gpu, struct msm_ringbuffer *ring,
spin_lock_irqsave(&ring->submit_lock, flags);
list_for_each_entry(submit, &ring->submits, node) {
if (submit->seqno > fence)
if (fence_after(submit->seqno, fence))
break;
msm_update_fence(submit->ring->fctx,
@ -509,7 +509,7 @@ static void hangcheck_handler(struct timer_list *t)
if (fence != ring->hangcheck_fence) {
/* some progress has been made.. ya! */
ring->hangcheck_fence = fence;
} else if (fence < ring->seqno) {
} else if (fence_before(fence, ring->seqno)) {
/* no progress and not done.. hung! */
ring->hangcheck_fence = fence;
DRM_DEV_ERROR(dev->dev, "%s: hangcheck detected gpu lockup rb %d!\n",
@ -523,7 +523,7 @@ static void hangcheck_handler(struct timer_list *t)
}
/* if still more pending work, reset the hangcheck timer: */
if (ring->seqno > ring->hangcheck_fence)
if (fence_after(ring->seqno, ring->hangcheck_fence))
hangcheck_timer_reset(gpu);
/* workaround for missing irq: */

2
drivers/gpu/drm/msm/msm_gpu.h
View file

@ -262,7 +262,7 @@ static inline bool msm_gpu_active(struct msm_gpu *gpu)
for (i = 0; i < gpu->nr_rings; i++) {
struct msm_ringbuffer *ring = gpu->rb[i];
if (ring->seqno > ring->memptrs->fence)
if (fence_after(ring->seqno, ring->memptrs->fence))
return true;
}