Chris Wilson 2e4c6c1a9d drm/i915: Remove i915_request.lock requirement for execution callbacks ... To implement preempt-to-busy (and so efficient timeslicing and best utilization of the hardware submission ports) we let the GPU run asynchronously in respect to the ELSP submission queue. This created challenges in keeping and accessing the driver state mirroring the asynchronous GPU execution. Previous fix 1d9221e9d3 ("drm/i915: Skip signaling a signaled request") however did not correctly serialize request retirement with the execution callbacks. We were using the i915_request.lock to serialise adding an execution callback with __i915_request_submit. However, if we use an atomic llist_add to serialise multiple waiters and then check to see if the request is already executing, we can remove the irq-spinlock and fix serialization between retirement and execution callbacks in one go. v2: Avoid using the irq_work when outside of the irq-spinlocks, where we can execute the callbacks immediately. v3: Pay close attention to the order of setting ACTIVE on retirement, we need to ensure the request is signaled and breadcrumbs detached before we finish removing the request from the engine. v4: Expanded commit message. Fixes: 1d9221e9d3 ("drm/i915: Skip signaling a signaled request") Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200716142207.13003-2-chris@chris-wilson.co.uk Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com> [Joonas: Rebased and reordered into drm-intel-gt-next branch] [Joonas: Added expanded commit message from Tvrtko and Chris] Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>		2020-09-07 15:08:06 +03:00
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drm	drm/i915: Remove i915_request.lock requirement for execution callbacks	2020-09-07 15:08:06 +03:00
host1x	gpu: host1x: debug: Dump push buffer state	2020-07-17 16:06:14 +02:00
ipu-v3	gpu: ipu-v3: image-convert: Wait for all EOFs before completing a tile	2020-07-20 15:16:05 +02:00
trace
vga	vgaarb: mark vga_tryget static	2020-08-01 11:28:17 +02:00
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