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linux_dsm_epyc7002/drivers/gpu/drm/i915/gt
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Chris Wilson 220dcfc148 drm/i915/gt: Yield the timeslice if caught waiting on a user semaphore 
If we find ourselves waiting on a MI_SEMAPHORE_WAIT, either within the
user batch or in our own preamble, the engine raises a
GT_WAIT_ON_SEMAPHORE interrupt. We can unmask that interrupt and so
respond to a semaphore wait by yielding the timeslice, if we have
another context to yield to!

The only real complication is that the interrupt is only generated for
the start of the semaphore wait, and is asynchronous to our
process_csb() -- that is, we may not have registered the timeslice before
we see the interrupt. To ensure we don't miss a potential semaphore
blocking forward progress (e.g. selftests/live_timeslice_preempt) we mark
the interrupt and apply it to the next timeslice regardless of whether it
was active at the time.

v2: We use semaphores in preempt-to-busy, within the timeslicing
implementation itself! Ergo, when we do insert a preemption due to an
expired timeslice, the new context may start with the missed semaphore
flagged by the retired context and be yielded, ad infinitum. To avoid
this, read the context id at the time of the semaphore interrupt and
only yield if that context is still active.

Fixes: 8ee36e048c ("drm/i915/execlists: Minimalistic timeslicing")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200407130811.17321-1-chris@chris-wilson.co.uk
(cherry picked from commit c4e8ba7390)
(cherry picked from commit cd60e4ac4738a6921592c4f7baf87f9a3499f0e2)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
2020-05-06 15:37:09 -07:00
..
selftests
uc drm/i915: Apply i915_request_skip() on submission 2020-03-04 14:29:50 +00:00
debugfs_engines.c drm/i915/gt: Move pm debug files into a gt aware debugfs 2019-12-22 15:25:10 +00:00
debugfs_engines.h drm/i915/gt: Move pm debug files into a gt aware debugfs 2019-12-22 15:25:10 +00:00
debugfs_gt_pm.c drm/i915/gt: Move pm debug files into a gt aware debugfs 2019-12-22 15:25:10 +00:00
debugfs_gt_pm.h drm/i915/gt: Move pm debug files into a gt aware debugfs 2019-12-22 15:25:10 +00:00
debugfs_gt.c drm/i915/gt: Move pm debug files into a gt aware debugfs 2019-12-22 15:25:10 +00:00
debugfs_gt.h drm/i915/gt: Move pm debug files into a gt aware debugfs 2019-12-22 15:25:10 +00:00
gen6_ppgtt.c drm pull for 5.6-rc1 2020-01-30 08:04:01 -08:00
gen6_ppgtt.h drm/i915/gtt: split up i915_gem_gtt 2020-01-07 19:27:36 +00:00
gen6_renderstate.c
gen7_renderclear.c drm/i915/gen7: Clear all EU/L3 residual contexts 2020-03-06 08:59:06 +00:00
gen7_renderclear.h drm/i915/gen7: Clear all EU/L3 residual contexts 2020-03-06 08:59:06 +00:00
gen7_renderstate.c
gen8_ppgtt.c drm/i915/vgpu: improve vgpu abstractions 2020-03-03 17:46:54 +02:00
gen8_ppgtt.h drm/i915/gtt: split up i915_gem_gtt 2020-01-07 19:27:36 +00:00
gen8_renderstate.c
gen9_renderstate.c
hsw_clear_kernel.c drm/i915/gen7: Clear all EU/L3 residual contexts 2020-03-06 08:59:06 +00:00
intel_breadcrumbs.c drm/i915/gt: Prevent queuing retire workers on the virtual engine 2020-02-07 10:54:49 +00:00
intel_context_param.c drm/i915: Allow userspace to specify ringsize on construction 2020-02-25 19:23:19 +00:00
intel_context_param.h drm/i915: Allow userspace to specify ringsize on construction 2020-02-25 19:23:19 +00:00
intel_context_sseu.c drm/i915/gt: Pull sseu context updates under gt 2020-02-04 10:14:03 +00:00
intel_context_types.h drm/i915: Use explicit flag to mark unreachable intel_context 2020-03-26 10:21:04 -07:00
intel_context.c drm/i915: Use explicit flag to mark unreachable intel_context 2020-03-26 10:21:04 -07:00
intel_context.h drm/i915: Use explicit flag to mark unreachable intel_context 2020-03-26 10:21:04 -07:00
intel_engine_cs.c drm/i915/gt: Yield the timeslice if caught waiting on a user semaphore 2020-05-06 15:37:09 -07:00
intel_engine_heartbeat.c drm/i915/gt: Fix up missing error propagation for heartbeat pulses 2020-02-18 20:32:21 +00:00
intel_engine_heartbeat.h
intel_engine_pm.c drm/i915/gt: Include a tell-tale for engine parking 2020-01-22 17:10:15 +00:00
intel_engine_pm.h
intel_engine_pool_types.h
intel_engine_pool.c
intel_engine_pool.h
intel_engine_types.h drm/i915/gt: Yield the timeslice if caught waiting on a user semaphore 2020-05-06 15:37:09 -07:00
intel_engine_user.c drm/i915/gt: Make WARN* drm specific where drm_priv ptr is available 2020-01-22 17:53:37 +02:00
intel_engine_user.h
intel_engine.h drm/i915/gt: Make timeslicing an explicit engine property 2020-05-04 10:35:55 -07:00
intel_ggtt.c drm/i915/gt: Fill all the unused space in the GGTT 2020-04-06 10:31:19 -07:00
intel_gpu_commands.h drm/i915/gen7: Clear all EU/L3 residual contexts 2020-03-06 08:59:06 +00:00
intel_gt_irq.c drm/i915/gt: Yield the timeslice if caught waiting on a user semaphore 2020-05-06 15:37:09 -07:00
intel_gt_irq.h drm/i915/gt: Reorganise gen8+ interrupt handler 2020-01-28 12:30:00 +00:00
intel_gt_pm_irq.c
intel_gt_pm_irq.h
intel_gt_pm.c drm/i915: extract engine WA programming to common resume function 2020-01-31 23:54:12 +00:00
intel_gt_pm.h drm/i915/gt: Apply sanitiization just before resume 2019-12-26 12:37:30 +00:00
intel_gt_requests.c drm/i915/gt: Drop the timeline->mutex as we wait for retirement 2020-03-03 17:30:20 +00:00
intel_gt_requests.h
intel_gt_types.h drm/i915: Remove i915->kernel_context 2019-12-21 16:37:10 +00:00
intel_gt.c drm/i915/gt: Wait for RCUs frees before asserting idle on unload 2020-03-12 20:47:24 +00:00
intel_gt.h drm/i915/gt: Drop rogue space in the middle of GT_TRACE 2020-01-16 15:41:34 +00:00
intel_gtt.c drm/i915/gt: Pull marking vm as closed underneath the vm->mutex 2020-02-28 12:33:07 +00:00
intel_gtt.h drm/i915/gt: Pull marking vm as closed underneath the vm->mutex 2020-02-28 12:33:07 +00:00
intel_llc_types.h
intel_llc.c drm/i915/gt: Do not attempt to reprogram IA/ring frequencies for dgfx 2020-02-19 22:27:10 +00:00
intel_llc.h
intel_lrc_reg.h drm/i915: Track hw reported context runtime 2020-02-16 15:16:22 +00:00
intel_lrc.c drm/i915/gt: Yield the timeslice if caught waiting on a user semaphore 2020-05-06 15:37:09 -07:00
intel_lrc.h drm/i915/gt: Merge engine init/setup loops 2019-12-22 15:18:05 +00:00
intel_mocs.c drm/i915/gt: Refactor l3cc/mocs availability 2020-02-19 14:09:18 +00:00
intel_mocs.h
intel_ppgtt.c drm/i915/gtt: split up i915_gem_gtt 2020-01-07 19:27:36 +00:00
intel_rc6_types.h drm/i915/gt: Only ignore rc6 parking for PCU on byt/bsw 2019-12-12 08:35:48 +00:00
intel_rc6.c drm/i915/gt: Select the deepest available parking mode for rc6 2020-03-26 10:21:30 -07:00
intel_rc6.h drm/i915/gt: Simplify rc6 w/a application 2019-12-02 21:57:22 +00:00
intel_renderstate.c drm/i915: Lift i915_vma_pin() out of intel_renderstate_emit() 2019-12-03 13:23:00 +00:00
intel_renderstate.h drm/i915: Lift i915_vma_pin() out of intel_renderstate_emit() 2019-12-03 13:23:00 +00:00
intel_reset_types.h
intel_reset.c drm/i915/gt: Cancel a hung context if already closed 2020-03-26 10:21:30 -07:00
intel_reset.h
intel_ring_submission.c drm/i915/gt: Restrict gen7 w/a batch to Haswell 2020-03-20 07:04:38 -07:00
intel_ring_types.h drm/i915/gt: Avoid resetting ring->head outside of its timeline mutex 2020-02-11 12:03:22 +00:00
intel_ring.c drm/i915/execlists: Always force a context reload when rewinding RING_TAIL 2020-02-07 21:41:46 +00:00
intel_ring.h drm/i915/execlists: Always force a context reload when rewinding RING_TAIL 2020-02-07 21:41:46 +00:00
intel_rps_types.h
intel_rps.c drm/i915/gt: Update PMINTRMSK holding fw 2020-04-20 10:12:36 -07:00
intel_rps.h drm/i915/rps: Add frequency translation helpers 2019-12-13 22:22:05 +00:00
intel_sseu.c
intel_sseu.h
intel_timeline_types.h drm/i915/gt: Pull GT initialisation under intel_gt_init() 2019-12-22 12:51:32 +00:00
intel_timeline.c drm/i915/gt: Check cacheline is valid before acquiring 2020-04-27 09:47:40 -07:00
intel_timeline.h
intel_workarounds_types.h drm/i915/gt: Skip rmw for masked registers 2020-02-01 09:21:57 +00:00
intel_workarounds.c drm/i915: Add Wa_1605460711 / Wa_1408767742 to ICL and EHL 2020-03-13 09:03:17 -07:00
intel_workarounds.h
ivb_clear_kernel.c drm/i915/gen7: Clear all EU/L3 residual contexts 2020-03-06 08:59:06 +00:00
mock_engine.c drm/i915: Apply i915_request_skip() on submission 2020-03-04 14:29:50 +00:00
mock_engine.h
selftest_context.c drm/i915: Remove i915->kernel_context 2019-12-21 16:37:10 +00:00
selftest_engine_cs.c drm/i915/selftests: fix uninitialized variable sum when summing up values 2019-12-10 14:35:24 +00:00
selftest_engine_heartbeat.c drm/i915/selftests: Disable heartbeat around manual pulse tests 2020-02-28 09:25:41 +00:00
selftest_engine_pm.c
selftest_engine.c
selftest_engine.h
selftest_gt_pm.c
selftest_hangcheck.c drm/i915: Apply i915_request_skip() on submission 2020-03-04 14:29:50 +00:00
selftest_llc.c drm/i915/gt: Do not attempt to reprogram IA/ring frequencies for dgfx 2020-02-19 22:27:10 +00:00
selftest_llc.h
selftest_lrc.c drm/i915/gt: Yield the timeslice if caught waiting on a user semaphore 2020-05-06 15:37:09 -07:00
selftest_mocs.c drm/i915/gt: Refactor l3cc/mocs availability 2020-02-19 14:09:18 +00:00
selftest_rc6.c drm/i915/gt: Select the deepest available parking mode for rc6 2020-03-26 10:21:30 -07:00
selftest_rc6.h
selftest_reset.c drm/i915/guc: Kill USES_GUC_SUBMISSION macro 2020-02-20 17:48:03 +00:00
selftest_ring_submission.c drm/i915/gt: Wait for the wa batch to be pinned 2020-03-07 17:10:35 +00:00
selftest_timeline.c drm/i915/selftests: Remove erroneous intel_engine_pm_put 2020-02-09 13:47:26 +00:00
selftest_workarounds.c drm/i915/selftests: Also wait for the scratch buffer to be bound 2020-01-31 15:10:02 +00:00
sysfs_engines.c drm/i915/gt: Expose heartbeat interval via sysfs 2020-02-28 22:03:49 +00:00
sysfs_engines.h drm/i915/gt: Expose engine properties via sysfs 2020-02-28 22:03:19 +00:00