diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c | 66 |
1 files changed, 64 insertions, 2 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c index 176f28777f5e..5448cf27654e 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c @@ -196,6 +196,19 @@ int amdgpu_fence_emit_polling(struct amdgpu_ring *ring, uint32_t *s) } /** + * amdgpu_fence_schedule_fallback - schedule fallback check + * + * @ring: pointer to struct amdgpu_ring + * + * Start a timer as fallback to our interrupts. + */ +static void amdgpu_fence_schedule_fallback(struct amdgpu_ring *ring) +{ + mod_timer(&ring->fence_drv.fallback_timer, + jiffies + AMDGPU_FENCE_JIFFIES_TIMEOUT); +} + +/** * amdgpu_fence_process - check for fence activity * * @ring: pointer to struct amdgpu_ring @@ -203,8 +216,10 @@ int amdgpu_fence_emit_polling(struct amdgpu_ring *ring, uint32_t *s) * Checks the current fence value and calculates the last * signalled fence value. Wakes the fence queue if the * sequence number has increased. + * + * Returns true if fence was processed */ -void amdgpu_fence_process(struct amdgpu_ring *ring) +bool amdgpu_fence_process(struct amdgpu_ring *ring) { struct amdgpu_fence_driver *drv = &ring->fence_drv; uint32_t seq, last_seq; @@ -216,8 +231,12 @@ void amdgpu_fence_process(struct amdgpu_ring *ring) } while (atomic_cmpxchg(&drv->last_seq, last_seq, seq) != last_seq); + if (del_timer(&ring->fence_drv.fallback_timer) && + seq != ring->fence_drv.sync_seq) + amdgpu_fence_schedule_fallback(ring); + if (unlikely(seq == last_seq)) - return; + return false; last_seq &= drv->num_fences_mask; seq &= drv->num_fences_mask; @@ -244,6 +263,24 @@ void amdgpu_fence_process(struct amdgpu_ring *ring) dma_fence_put(fence); } while (last_seq != seq); + + return true; +} + +/** + * amdgpu_fence_fallback - fallback for hardware interrupts + * + * @work: delayed work item + * + * Checks for fence activity. + */ +static void amdgpu_fence_fallback(struct timer_list *t) +{ + struct amdgpu_ring *ring = from_timer(ring, t, + fence_drv.fallback_timer); + + if (amdgpu_fence_process(ring)) + DRM_WARN("Fence fallback timer expired on ring %s\n", ring->name); } /** @@ -393,6 +430,8 @@ int amdgpu_fence_driver_init_ring(struct amdgpu_ring *ring, atomic_set(&ring->fence_drv.last_seq, 0); ring->fence_drv.initialized = false; + timer_setup(&ring->fence_drv.fallback_timer, amdgpu_fence_fallback, 0); + ring->fence_drv.num_fences_mask = num_hw_submission * 2 - 1; spin_lock_init(&ring->fence_drv.lock); ring->fence_drv.fences = kcalloc(num_hw_submission * 2, sizeof(void *), @@ -468,6 +507,7 @@ void amdgpu_fence_driver_fini(struct amdgpu_device *adev) amdgpu_irq_put(adev, ring->fence_drv.irq_src, ring->fence_drv.irq_type); drm_sched_fini(&ring->sched); + del_timer_sync(&ring->fence_drv.fallback_timer); for (j = 0; j <= ring->fence_drv.num_fences_mask; ++j) dma_fence_put(ring->fence_drv.fences[j]); kfree(ring->fence_drv.fences); @@ -561,6 +601,27 @@ static const char *amdgpu_fence_get_timeline_name(struct dma_fence *f) } /** + * amdgpu_fence_enable_signaling - enable signalling on fence + * @fence: fence + * + * This function is called with fence_queue lock held, and adds a callback + * to fence_queue that checks if this fence is signaled, and if so it + * signals the fence and removes itself. + */ +static bool amdgpu_fence_enable_signaling(struct dma_fence *f) +{ + struct amdgpu_fence *fence = to_amdgpu_fence(f); + struct amdgpu_ring *ring = fence->ring; + + if (!timer_pending(&ring->fence_drv.fallback_timer)) + amdgpu_fence_schedule_fallback(ring); + + DMA_FENCE_TRACE(&fence->base, "armed on ring %i!\n", ring->idx); + + return true; +} + +/** * amdgpu_fence_free - free up the fence memory * * @rcu: RCU callback head @@ -590,6 +651,7 @@ static void amdgpu_fence_release(struct dma_fence *f) static const struct dma_fence_ops amdgpu_fence_ops = { .get_driver_name = amdgpu_fence_get_driver_name, .get_timeline_name = amdgpu_fence_get_timeline_name, + .enable_signaling = amdgpu_fence_enable_signaling, .release = amdgpu_fence_release, }; |