On Tue, Dec 01, 2015 at 11:05:33AM +0000, Chris Wilson wrote:
> This is just a little bit of syntatic sugar to hide the atomic_reads()
> throughout the code to retrieve the current reset_counter. It also
> provides the other utility functions to check the reset state on the
> already read reset_counter, so that we can read it once and do multiple
> tests rather than risk the value changing between tests.
This patch also changes the meaning of reset_in_progress to not include
WEDGED afaict. I agree with that change, but it needs to be mentioned in
the commit message.
Also with that change there's some cleanup potential since a bunch of
callers that explicitly checked for reset_in_progress &&
!terminally_wedged now can drop the 2nd part of the condition. That
simplification is why I've done this change in my patch.
-Daniel
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_debugfs.c | 2 +-
> drivers/gpu/drm/i915/i915_drv.h | 32 ++++++++++++++++++++++++++++----
> drivers/gpu/drm/i915/i915_gem.c | 12 ++++++------
> drivers/gpu/drm/i915/intel_display.c | 16 ++++++++++------
> drivers/gpu/drm/i915/intel_ringbuffer.c | 2 +-
> 5 files changed, 46 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index bfd57fb597dc..864b3ae9419c 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -4656,7 +4656,7 @@ i915_wedged_get(void *data, u64 *val)
> struct drm_device *dev = data;
> struct drm_i915_private *dev_priv = dev->dev_private;
>
> - *val = atomic_read(&dev_priv->gpu_error.reset_counter);
> + *val = i915_reset_counter(&dev_priv->gpu_error);
>
> return 0;
> }
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index d07041c1729d..2a4cfa06c28d 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -2979,20 +2979,44 @@ void i915_gem_retire_requests_ring(struct intel_engine_cs *ring);
> int __must_check i915_gem_check_wedge(struct i915_gpu_error *error,
> bool interruptible);
>
> +static inline u32 i915_reset_counter(struct i915_gpu_error *error)
> +{
> + return atomic_read(&error->reset_counter);
> +}
> +
> +static inline bool __i915_reset_in_progress(u32 reset)
> +{
> + return unlikely(reset & I915_RESET_IN_PROGRESS_FLAG);
> +}
> +
> +static inline bool __i915_reset_in_progress_or_wedged(u32 reset)
> +{
> + return unlikely(reset & (I915_RESET_IN_PROGRESS_FLAG | I915_WEDGED));
> +}
> +
> +static inline bool __i915_terminally_wedged(u32 reset)
> +{
> + return unlikely(reset & I915_WEDGED);
> +}
> +
> static inline bool i915_reset_in_progress(struct i915_gpu_error *error)
> {
> - return unlikely(atomic_read(&error->reset_counter)
> - & (I915_RESET_IN_PROGRESS_FLAG | I915_WEDGED));
> + return __i915_reset_in_progress(i915_reset_counter(error));
> +}
> +
> +static inline bool i915_reset_in_progress_or_wedged(struct i915_gpu_error *error)
> +{
> + return __i915_reset_in_progress_or_wedged(i915_reset_counter(error));
> }
>
> static inline bool i915_terminally_wedged(struct i915_gpu_error *error)
> {
> - return atomic_read(&error->reset_counter) & I915_WEDGED;
> + return __i915_terminally_wedged(i915_reset_counter(error));
> }
>
> static inline u32 i915_reset_count(struct i915_gpu_error *error)
> {
> - return ((atomic_read(&error->reset_counter) & ~I915_WEDGED) + 1) / 2;
> + return ((i915_reset_counter(error) & ~I915_WEDGED) + 1) / 2;
> }
>
> static inline bool i915_stop_ring_allow_ban(struct drm_i915_private *dev_priv)
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index cccfe5bfe5bf..bff245de8ade 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -1297,7 +1297,7 @@ int __i915_wait_request(struct drm_i915_gem_request *req,
>
> /* We need to check whether any gpu reset happened in between
> * the caller grabbing the seqno and now ... */
> - if (reset_counter != atomic_read(&dev_priv->gpu_error.reset_counter)) {
> + if (reset_counter != i915_reset_counter(&dev_priv->gpu_error)) {
> /* ... but upgrade the -EAGAIN to an -EIO if the gpu
> * is truely gone. */
> ret = i915_gem_check_wedge(&dev_priv->gpu_error, interruptible);
> @@ -1475,7 +1475,7 @@ i915_wait_request(struct drm_i915_gem_request *req)
> return ret;
>
> ret = __i915_wait_request(req,
> - atomic_read(&dev_priv->gpu_error.reset_counter),
> + i915_reset_counter(&dev_priv->gpu_error),
> interruptible, NULL, NULL);
> if (ret)
> return ret;
> @@ -1564,7 +1564,7 @@ i915_gem_object_wait_rendering__nonblocking(struct drm_i915_gem_object *obj,
> if (ret)
> return ret;
>
> - reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);
> + reset_counter = i915_reset_counter(&dev_priv->gpu_error);
>
> if (readonly) {
> struct drm_i915_gem_request *req;
> @@ -3110,7 +3110,7 @@ i915_gem_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
> }
>
> drm_gem_object_unreference(&obj->base);
> - reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);
> + reset_counter = i915_reset_counter(&dev_priv->gpu_error);
>
> for (i = 0; i < I915_NUM_RINGS; i++) {
> if (obj->last_read_req[i] == NULL)
> @@ -3155,7 +3155,7 @@ __i915_gem_object_sync(struct drm_i915_gem_object *obj,
> if (!i915_semaphore_is_enabled(obj->base.dev)) {
> struct drm_i915_private *i915 = to_i915(obj->base.dev);
> ret = __i915_wait_request(from_req,
> - atomic_read(&i915->gpu_error.reset_counter),
> + i915_reset_counter(&i915->gpu_error),
> i915->mm.interruptible,
> NULL,
> &i915->rps.semaphores);
> @@ -4109,7 +4109,7 @@ i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file)
>
> target = request;
> }
> - reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);
> + reset_counter = i915_reset_counter(&dev_priv->gpu_error);
> if (target)
> i915_gem_request_reference(target);
> spin_unlock(&file_priv->mm.lock);
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 4ae490dfe2c4..511ead08ccd8 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -3287,10 +3287,12 @@ static bool intel_crtc_has_pending_flip(struct drm_crtc *crtc)
> struct drm_device *dev = crtc->dev;
> struct drm_i915_private *dev_priv = dev->dev_private;
> struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> + unsigned reset_counter;
> bool pending;
>
> - if (i915_reset_in_progress(&dev_priv->gpu_error) ||
> - intel_crtc->reset_counter != atomic_read(&dev_priv->gpu_error.reset_counter))
> + reset_counter = i915_reset_counter(&dev_priv->gpu_error);
> + if (intel_crtc->reset_counter != reset_counter ||
> + __i915_reset_in_progress(reset_counter))
> return false;
>
> spin_lock_irq(&dev->event_lock);
> @@ -10865,9 +10867,11 @@ static bool page_flip_finished(struct intel_crtc *crtc)
> {
> struct drm_device *dev = crtc->base.dev;
> struct drm_i915_private *dev_priv = dev->dev_private;
> + unsigned reset_counter;
>
> - if (i915_reset_in_progress(&dev_priv->gpu_error) ||
> - crtc->reset_counter != atomic_read(&dev_priv->gpu_error.reset_counter))
> + reset_counter = i915_reset_counter(&dev_priv->gpu_error);
> + if (crtc->reset_counter != reset_counter ||
> + __i915_reset_in_progress(reset_counter))
> return true;
>
> /*
> @@ -11511,7 +11515,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
> goto cleanup;
>
> atomic_inc(&intel_crtc->unpin_work_count);
> - intel_crtc->reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);
> + intel_crtc->reset_counter = i915_reset_counter(&dev_priv->gpu_error);
>
> if (INTEL_INFO(dev)->gen >= 5 || IS_G4X(dev))
> work->flip_count = I915_READ(PIPE_FLIPCOUNT_G4X(pipe)) + 1;
> @@ -13303,7 +13307,7 @@ static int intel_atomic_prepare_commit(struct drm_device *dev,
> if (!ret && !async && !i915_reset_in_progress(&dev_priv->gpu_error)) {
> u32 reset_counter;
>
> - reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);
> + reset_counter = i915_reset_counter(&dev_priv->gpu_error);
> mutex_unlock(&dev->struct_mutex);
>
> for_each_plane_in_state(state, plane, plane_state, i) {
> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
> index 57d78f264b53..8970267d27bb 100644
> --- a/drivers/gpu/drm/i915/intel_ringbuffer.c
> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
> @@ -2286,7 +2286,7 @@ int intel_ring_idle(struct intel_engine_cs *ring)
>
> /* Make sure we do not trigger any retires */
> return __i915_wait_request(req,
> - atomic_read(&to_i915(ring->dev)->gpu_error.reset_counter),
> + i915_reset_counter(&to_i915(ring->dev)->gpu_error),
> to_i915(ring->dev)->mm.interruptible,
> NULL, NULL);
> }
> --
> 2.6.2
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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