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@xxxxxxx>
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?
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
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
