Re: [Linaro-mm-sig] [PATCH 2/3] dma-buf: nuke DMA_FENCE_TRACE macros

Am 29.07.21 um 09:22 schrieb Daniel Vetter:

On Thu, Jul 29, 2021 at 09:03:29AM +0200, Christian König wrote:

...

Only the DRM GPU scheduler, radeon and amdgpu where using them and they depend on a non existing config option to actually emit some code.

Nuke them and clean up the dma_fence_signal* return value.

Signed-off-by: Christian König christian.koenig@amd.com

So i915 is very much become a horror show of wheel reinventing (and we're trying to fix that), but there's some legit hand-rolled use-cases for having the return value of dma_fence_signal. We're not using that right now because hand-rollled nonsense, but can you perhaps keep that part?

I was considering that for the unit tests as well, but then though "nah, not if no drivers uses it".

But can I make that a bool while at it? E.g. true for was signaled and false for already signaled like we have for the callbacks?

Thanks, Christian.

Other pieces lgtm. -Daniel

...

---

drivers/dma-buf/dma-fence.c | 44 +++++------------------ drivers/dma-buf/st-dma-fence.c | 12 ++----- drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c | 10 +----- drivers/gpu/drm/radeon/radeon_fence.c | 24 +++---------- drivers/gpu/drm/scheduler/sched_fence.c | 18 ++-------- include/linux/dma-fence.h | 32 +++-------------- 6 files changed, 23 insertions(+), 117 deletions(-)

diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c index ce0f5eff575d..21cba0f74e69 100644 --- a/drivers/dma-buf/dma-fence.c +++ b/drivers/dma-buf/dma-fence.c @@ -350,12 +350,9 @@ void __dma_fence_might_wait(void)

• Unlike dma_fence_signal_timestamp(), this function must be called with
• &dma_fence.lock held.

• • Returns 0 on success and a negative error value when @fence has been
• • signalled already.
  */

-int dma_fence_signal_timestamp_locked(struct dma_fence *fence,

• 		      ktime_t timestamp)
  

+void dma_fence_signal_timestamp_locked(struct dma_fence *fence,

• 		       ktime_t timestamp)
  

  { struct dma_fence_cb *cur, *tmp; struct list_head cb_list;

@@ -364,7 +361,7 @@ int dma_fence_signal_timestamp_locked(struct dma_fence *fence, if (unlikely(test_and_set_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)))

• return -EINVAL;
  

• return;
  

/* Stash the cb_list before replacing it with the timestamp */ list_replace(&fence->cb_list, &cb_list); @@ -377,8 +374,6 @@ int dma_fence_signal_timestamp_locked(struct dma_fence *fence, INIT_LIST_HEAD(&cur->node); cur->func(fence, cur); }

• return 0; } EXPORT_SYMBOL(dma_fence_signal_timestamp_locked);

@@ -393,23 +388,14 @@ EXPORT_SYMBOL(dma_fence_signal_timestamp_locked);

• can only go from the unsignaled to the signaled state and not back, it will
• only be effective the first time. Set the timestamp provided as the fence
• signal timestamp.

• • Returns 0 on success and a negative error value when @fence has been
• • signalled already.
  */

-int dma_fence_signal_timestamp(struct dma_fence *fence, ktime_t timestamp) +void dma_fence_signal_timestamp(struct dma_fence *fence, ktime_t timestamp) { unsigned long flags;

• int ret;
• if (!fence)

• return -EINVAL;
  

spin_lock_irqsave(fence->lock, flags);

• ret = dma_fence_signal_timestamp_locked(fence, timestamp);

• dma_fence_signal_timestamp_locked(fence, timestamp); spin_unlock_irqrestore(fence->lock, flags);

• return ret; } EXPORT_SYMBOL(dma_fence_signal_timestamp);

@@ -425,13 +411,10 @@ EXPORT_SYMBOL(dma_fence_signal_timestamp);

• Unlike dma_fence_signal(), this function must be called with &dma_fence.lock
• held.

• • Returns 0 on success and a negative error value when @fence has been
• • signalled already.
  */

-int dma_fence_signal_locked(struct dma_fence *fence) +void dma_fence_signal_locked(struct dma_fence *fence) {

• return dma_fence_signal_timestamp_locked(fence, ktime_get());

• dma_fence_signal_timestamp_locked(fence, ktime_get()); } EXPORT_SYMBOL(dma_fence_signal_locked);

@@ -444,28 +427,19 @@ EXPORT_SYMBOL(dma_fence_signal_locked);

• dma_fence_add_callback(). Can be called multiple times, but since a fence
• can only go from the unsignaled to the signaled state and not back, it will
• only be effective the first time.

• • Returns 0 on success and a negative error value when @fence has been
• • signalled already.
  */

-int dma_fence_signal(struct dma_fence *fence) +void dma_fence_signal(struct dma_fence *fence) { unsigned long flags;

• int ret; bool tmp;

• if (!fence)

• return -EINVAL;
  

• tmp = dma_fence_begin_signalling();

spin_lock_irqsave(fence->lock, flags);

• ret = dma_fence_signal_timestamp_locked(fence, ktime_get());

• dma_fence_signal_timestamp_locked(fence, ktime_get()); spin_unlock_irqrestore(fence->lock, flags);

dma_fence_end_signalling(tmp);

• return ret; } EXPORT_SYMBOL(dma_fence_signal);

diff --git a/drivers/dma-buf/st-dma-fence.c b/drivers/dma-buf/st-dma-fence.c index c8a12d7ad71a..e89001d8873f 100644 --- a/drivers/dma-buf/st-dma-fence.c +++ b/drivers/dma-buf/st-dma-fence.c @@ -122,21 +122,13 @@ static int test_signaling(void *arg) goto err_free; }

• if (dma_fence_signal(f)) {

• pr_err("Fence reported being already signaled\n");
  

• goto err_free;
  

• }

• dma_fence_signal(f); if (!dma_fence_is_signaled(f)) { pr_err("Fence not reporting signaled\n"); goto err_free; }

• if (!dma_fence_signal(f)) {

• pr_err("Fence reported not being already signaled\n");
  

• goto err_free;
  

• }

• dma_fence_signal(f); err = 0; err_free: dma_fence_put(f);

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c index d4547d195173..397872779c31 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c @@ -246,7 +246,6 @@ bool amdgpu_fence_process(struct amdgpu_ring *ring) struct amdgpu_fence_driver *drv = &ring->fence_drv; struct amdgpu_device *adev = ring->adev; uint32_t seq, last_seq;

• int r;

do { last_seq = atomic_read(&ring->fence_drv.last_seq); @@ -278,12 +277,7 @@ bool amdgpu_fence_process(struct amdgpu_ring *ring) if (!fence) continue;

• r = dma_fence_signal(fence);
  

• if (!r)
  

• 	DMA_FENCE_TRACE(fence, "signaled from irq context\n");
  

• else
  

• 	BUG();
  

• dma_fence_signal(fence);
  

  dma_fence_put(fence); pm_runtime_mark_last_busy(adev_to_drm(adev)->dev); pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);

@@ -673,8 +667,6 @@ static bool amdgpu_fence_enable_signaling(struct dma_fence *f) 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; }

diff --git a/drivers/gpu/drm/radeon/radeon_fence.c b/drivers/gpu/drm/radeon/radeon_fence.c index 18f2c2e0dfb3..3f351d222cbb 100644 --- a/drivers/gpu/drm/radeon/radeon_fence.c +++ b/drivers/gpu/drm/radeon/radeon_fence.c @@ -176,18 +176,11 @@ static int radeon_fence_check_signaled(wait_queue_entry_t *wait, unsigned mode, */ seq = atomic64_read(&fence->rdev->fence_drv[fence->ring].last_seq); if (seq >= fence->seq) {

• int ret = dma_fence_signal_locked(&fence->base);
  

• if (!ret)
  

• 	DMA_FENCE_TRACE(&fence->base, "signaled from irq context\n");
  

• else
  

• 	DMA_FENCE_TRACE(&fence->base, "was already signaled\n");
  

• dma_fence_signal_locked(&fence->base);
  

  radeon_irq_kms_sw_irq_put(fence->rdev, fence->ring); __remove_wait_queue(&fence->rdev->fence_queue, &fence->fence_wake); dma_fence_put(&fence->base);

• } else

• DMA_FENCE_TRACE(&fence->base, "pending\n");
  

• } return 0; }

@@ -422,8 +415,6 @@ static bool radeon_fence_enable_signaling(struct dma_fence *f) fence->fence_wake.func = radeon_fence_check_signaled; __add_wait_queue(&rdev->fence_queue, &fence->fence_wake); dma_fence_get(f);

• DMA_FENCE_TRACE(&fence->base, "armed on ring %i!\n", fence->ring); return true; }

@@ -441,11 +432,7 @@ bool radeon_fence_signaled(struct radeon_fence *fence) return true; if (radeon_fence_seq_signaled(fence->rdev, fence->seq, fence->ring)) {

• int ret;
  

• ret = dma_fence_signal(&fence->base);
  

• if (!ret)
  

• 	DMA_FENCE_TRACE(&fence->base, "signaled from radeon_fence_signaled\n");
  

• dma_fence_signal(&fence->base);
  

  return true; } return false;

@@ -550,7 +537,6 @@ long radeon_fence_wait_timeout(struct radeon_fence *fence, bool intr, long timeo { uint64_t seq[RADEON_NUM_RINGS] = {}; long r;

• int r_sig;

/* * This function should not be called on !radeon fences. @@ -567,9 +553,7 @@ long radeon_fence_wait_timeout(struct radeon_fence *fence, bool intr, long timeo return r; }

• r_sig = dma_fence_signal(&fence->base);
• if (!r_sig)

• DMA_FENCE_TRACE(&fence->base, "signaled from fence_wait\n");
  

• dma_fence_signal(&fence->base); return r; }

diff --git a/drivers/gpu/drm/scheduler/sched_fence.c b/drivers/gpu/drm/scheduler/sched_fence.c index 69de2c76731f..3736746c47bd 100644 --- a/drivers/gpu/drm/scheduler/sched_fence.c +++ b/drivers/gpu/drm/scheduler/sched_fence.c @@ -50,26 +50,12 @@ static void __exit drm_sched_fence_slab_fini(void) void drm_sched_fence_scheduled(struct drm_sched_fence *fence) {

• int ret = dma_fence_signal(&fence->scheduled);
• if (!ret)

• DMA_FENCE_TRACE(&fence->scheduled,
  

• 		"signaled from irq context\n");
  

• else

• DMA_FENCE_TRACE(&fence->scheduled,
  

• 		"was already signaled\n");
  

• dma_fence_signal(&fence->scheduled); }

void drm_sched_fence_finished(struct drm_sched_fence *fence) {

• int ret = dma_fence_signal(&fence->finished);
• if (!ret)

• DMA_FENCE_TRACE(&fence->finished,
  

• 		"signaled from irq context\n");
  

• else

• DMA_FENCE_TRACE(&fence->finished,
  

• 		"was already signaled\n");
  

• dma_fence_signal(&fence->finished); }

static const char *drm_sched_fence_get_driver_name(struct dma_fence *fence) diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h index 6ffb4b2c6371..027db23fd4e3 100644 --- a/include/linux/dma-fence.h +++ b/include/linux/dma-fence.h @@ -370,11 +370,11 @@ static inline void dma_fence_end_signalling(bool cookie) {} static inline void __dma_fence_might_wait(void) {} #endif -int dma_fence_signal(struct dma_fence *fence); -int dma_fence_signal_locked(struct dma_fence *fence); -int dma_fence_signal_timestamp(struct dma_fence *fence, ktime_t timestamp); -int dma_fence_signal_timestamp_locked(struct dma_fence *fence,

• 		      ktime_t timestamp);
  

+void dma_fence_signal(struct dma_fence *fence); +void dma_fence_signal_locked(struct dma_fence *fence); +void dma_fence_signal_timestamp(struct dma_fence *fence, ktime_t timestamp); +void dma_fence_signal_timestamp_locked(struct dma_fence *fence,

• 		       ktime_t timestamp);
  

  signed long dma_fence_default_wait(struct dma_fence *fence, bool intr, signed long timeout); int dma_fence_add_callback(struct dma_fence *fence,

@@ -590,26 +590,4 @@ struct dma_fence *dma_fence_get_stub(void); struct dma_fence *dma_fence_allocate_private_stub(void); u64 dma_fence_context_alloc(unsigned num); -#define DMA_FENCE_TRACE(f, fmt, args...) \

• do { \

• struct dma_fence *__ff = (f);				\
  

• if (IS_ENABLED(CONFIG_DMA_FENCE_TRACE))			\
  

• 	pr_info("f %llu#%llu: " fmt,			\
  

• 		__ff->context, __ff->seqno, ##args);	\
  

• } while (0)

-#define DMA_FENCE_WARN(f, fmt, args...) \

• do { \

• struct dma_fence *__ff = (f);				\
  

• pr_warn("f %llu#%llu: " fmt, __ff->context, __ff->seqno,\
  

• 	 ##args);					\
  

• } while (0)

-#define DMA_FENCE_ERR(f, fmt, args...) \

• do { \

• struct dma_fence *__ff = (f);				\
  

• pr_err("f %llu#%llu: " fmt, __ff->context, __ff->seqno,	\
  

• 	##args);					\
  

• } while (0)
• #endif /* __LINUX_DMA_FENCE_H */

-- 2.25.1