From: Rob Clark robdclark@chromium.org
Before adding another lock, give ring->lock a more descriptive name.
Signed-off-by: Rob Clark robdclark@chromium.org Reviewed-by: Jordan Crouse jcrouse@codeaurora.org --- drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 4 ++-- drivers/gpu/drm/msm/adreno/a5xx_preempt.c | 12 ++++++------ drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 4 ++-- drivers/gpu/drm/msm/msm_ringbuffer.c | 2 +- drivers/gpu/drm/msm/msm_ringbuffer.h | 7 ++++++- 5 files changed, 17 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c index b2593c6bd2ac..2befaf304f04 100644 --- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c +++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c @@ -36,7 +36,7 @@ void a5xx_flush(struct msm_gpu *gpu, struct msm_ringbuffer *ring, OUT_RING(ring, upper_32_bits(shadowptr(a5xx_gpu, ring))); }
- spin_lock_irqsave(&ring->lock, flags); + spin_lock_irqsave(&ring->preempt_lock, flags);
/* Copy the shadow to the actual register */ ring->cur = ring->next; @@ -44,7 +44,7 @@ void a5xx_flush(struct msm_gpu *gpu, struct msm_ringbuffer *ring, /* Make sure to wrap wptr if we need to */ wptr = get_wptr(ring);
- spin_unlock_irqrestore(&ring->lock, flags); + spin_unlock_irqrestore(&ring->preempt_lock, flags);
/* Make sure everything is posted before making a decision */ mb(); diff --git a/drivers/gpu/drm/msm/adreno/a5xx_preempt.c b/drivers/gpu/drm/msm/adreno/a5xx_preempt.c index 7e04509c4e1f..183de1139eeb 100644 --- a/drivers/gpu/drm/msm/adreno/a5xx_preempt.c +++ b/drivers/gpu/drm/msm/adreno/a5xx_preempt.c @@ -45,9 +45,9 @@ static inline void update_wptr(struct msm_gpu *gpu, struct msm_ringbuffer *ring) if (!ring) return;
- spin_lock_irqsave(&ring->lock, flags); + spin_lock_irqsave(&ring->preempt_lock, flags); wptr = get_wptr(ring); - spin_unlock_irqrestore(&ring->lock, flags); + spin_unlock_irqrestore(&ring->preempt_lock, flags);
gpu_write(gpu, REG_A5XX_CP_RB_WPTR, wptr); } @@ -62,9 +62,9 @@ static struct msm_ringbuffer *get_next_ring(struct msm_gpu *gpu) bool empty; struct msm_ringbuffer *ring = gpu->rb[i];
- spin_lock_irqsave(&ring->lock, flags); + spin_lock_irqsave(&ring->preempt_lock, flags); empty = (get_wptr(ring) == ring->memptrs->rptr); - spin_unlock_irqrestore(&ring->lock, flags); + spin_unlock_irqrestore(&ring->preempt_lock, flags);
if (!empty) return ring; @@ -132,9 +132,9 @@ void a5xx_preempt_trigger(struct msm_gpu *gpu) }
/* Make sure the wptr doesn't update while we're in motion */ - spin_lock_irqsave(&ring->lock, flags); + spin_lock_irqsave(&ring->preempt_lock, flags); a5xx_gpu->preempt[ring->id]->wptr = get_wptr(ring); - spin_unlock_irqrestore(&ring->lock, flags); + spin_unlock_irqrestore(&ring->preempt_lock, flags);
/* Set the address of the incoming preemption record */ gpu_write64(gpu, REG_A5XX_CP_CONTEXT_SWITCH_RESTORE_ADDR_LO, diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c index 0894703a742e..5dddb9163bd3 100644 --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c @@ -65,7 +65,7 @@ static void a6xx_flush(struct msm_gpu *gpu, struct msm_ringbuffer *ring) OUT_RING(ring, upper_32_bits(shadowptr(a6xx_gpu, ring))); }
- spin_lock_irqsave(&ring->lock, flags); + spin_lock_irqsave(&ring->preempt_lock, flags);
/* Copy the shadow to the actual register */ ring->cur = ring->next; @@ -73,7 +73,7 @@ static void a6xx_flush(struct msm_gpu *gpu, struct msm_ringbuffer *ring) /* Make sure to wrap wptr if we need to */ wptr = get_wptr(ring);
- spin_unlock_irqrestore(&ring->lock, flags); + spin_unlock_irqrestore(&ring->preempt_lock, flags);
/* Make sure everything is posted before making a decision */ mb(); diff --git a/drivers/gpu/drm/msm/msm_ringbuffer.c b/drivers/gpu/drm/msm/msm_ringbuffer.c index 935bf9b1d941..1b6958e908dc 100644 --- a/drivers/gpu/drm/msm/msm_ringbuffer.c +++ b/drivers/gpu/drm/msm/msm_ringbuffer.c @@ -46,7 +46,7 @@ struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int id, ring->memptrs_iova = memptrs_iova;
INIT_LIST_HEAD(&ring->submits); - spin_lock_init(&ring->lock); + spin_lock_init(&ring->preempt_lock);
snprintf(name, sizeof(name), "gpu-ring-%d", ring->id);
diff --git a/drivers/gpu/drm/msm/msm_ringbuffer.h b/drivers/gpu/drm/msm/msm_ringbuffer.h index 0987d6bf848c..4956d1bc5d0e 100644 --- a/drivers/gpu/drm/msm/msm_ringbuffer.h +++ b/drivers/gpu/drm/msm/msm_ringbuffer.h @@ -46,7 +46,12 @@ struct msm_ringbuffer { struct msm_rbmemptrs *memptrs; uint64_t memptrs_iova; struct msm_fence_context *fctx; - spinlock_t lock; + + /* + * preempt_lock protects preemption and serializes wptr updates against + * preemption. Can be aquired from irq context. + */ + spinlock_t preempt_lock; };
struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int id,