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linux/drivers/gpu/drm/i915
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Chris Wilson 22b7a426bb drm/i915/execlists: Preempt-to-busy 
When using a global seqno, we required a precise stop-the-workd event to
handle preemption and unwind the global seqno counter. To accomplish
this, we would preempt to a special out-of-band context and wait for the
machine to report that it was idle. Given an idle machine, we could very
precisely see which requests had completed and which we needed to feed
back into the run queue.

However, now that we have scrapped the global seqno, we no longer need
to precisely unwind the global counter and only track requests by their
per-context seqno. This allows us to loosely unwind inflight requests
while scheduling a preemption, with the enormous caveat that the
requests we put back on the run queue are still _inflight_ (until the
preemption request is complete). This makes request tracking much more
messy, as at any point then we can see a completed request that we
believe is not currently scheduled for execution. We also have to be
careful not to rewind RING_TAIL past RING_HEAD on preempting to the
running context, and for this we use a semaphore to prevent completion
of the request before continuing.

To accomplish this feat, we change how we track requests scheduled to
the HW. Instead of appending our requests onto a single list as we
submit, we track each submission to ELSP as its own block. Then upon
receiving the CS preemption event, we promote the pending block to the
inflight block (discarding what was previously being tracked). As normal
CS completion events arrive, we then remove stale entries from the
inflight tracker.

v2: Be a tinge paranoid and ensure we flush the write into the HWS page
for the GPU semaphore to pick in a timely fashion.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190620142052.19311-1-chris@chris-wilson.co.uk
2019-06-20 16:52:36 +01:00
..
display drm/i915/ehl: Allow combo PHY A to drive a third external display 2019-06-19 11:28:02 -07:00
gem drm/i915/execlists: Preempt-to-busy 2019-06-20 16:52:36 +01:00
gt drm/i915/execlists: Preempt-to-busy 2019-06-20 16:52:36 +01:00
gvt drm/i915/gtt: Use a common type for page directories 2019-06-17 16:30:54 +03:00
selftests drm/i915/execlists: Preempt-to-busy 2019-06-20 16:52:36 +01:00
.gitignore drm/i915: add Makefile magic for testing headers are self-contained 2019-04-04 19:49:42 +03:00
i915_active.c drm/i915: Keep engine alive as we retire the context 2019-06-18 15:14:22 +01:00
i915_active.h drm/i915: Stop passing I915_WAIT_LOCKED to i915_request_wait() 2019-06-19 12:58:38 +01:00
i915_active_types.h drm/i915: Keep contexts pinned until after the next kernel context switch 2019-06-14 19:03:32 +01:00
i915_cmd_parser.c drm/i915: Move GEM object domain management from struct_mutex to local 2019-05-28 12:45:29 +01:00
i915_debugfs.c drm/i915: no need to check return value of debugfs_create functions 2019-06-17 15:53:08 +03:00
i915_debugfs.h drm/i915: extract i915_debugfs.h from i915_drv.h 2019-05-03 10:06:40 +03:00
i915_drv.c drm/i915/gvt: decouple check_vgpu() from uncore_init() 2019-06-20 16:34:57 +01:00
i915_drv.h drm/i915: kill uncore_to_i915 2019-06-20 16:34:54 +01:00
i915_fixed.h drm/i915: Use mul_u32_u32() more 2019-05-03 20:09:51 +03:00
i915_gem.c drm/i915: move modesetting core code under display/ 2019-06-17 11:48:32 +03:00
i915_gem.h drm/i915: Load balancing across a virtual engine 2019-05-22 08:40:38 +01:00
i915_gem_batch_pool.c drm/i915: Use drm_gem_object.resv 2019-06-18 15:30:32 +01:00
i915_gem_batch_pool.h drm/i915: Split GEM object type definition to its own header 2019-05-28 12:45:29 +01:00
i915_gem_evict.c drm/i915: Move more GEM objects under gem/ 2019-05-28 12:45:29 +01:00
i915_gem_fence_reg.c drm/i915: make intel_wakeref work on the rpm struct 2019-06-14 15:58:33 +01:00
i915_gem_fence_reg.h drm/i915: Move fence register tracking from i915->mm to ggtt 2019-06-13 09:37:39 +01:00
i915_gem_gtt.c drm/i915/gtt: Serialise both updates to PDE and our shadow 2019-06-17 20:53:03 +01:00
i915_gem_gtt.h drm/i915/gtt: Use a common type for page directories 2019-06-17 16:30:54 +03:00
i915_gem_render_state.c drm/i915: Drop the deferred active reference 2019-05-28 12:45:29 +01:00
i915_gem_render_state.h
i915_globals.c drm/i915: Move more GEM objects under gem/ 2019-05-28 12:45:29 +01:00
i915_globals.h drm/i915: Move over to intel_context_lookup() 2019-03-08 13:59:52 +00:00
i915_gpu_error.c drm/i915/execlists: Preempt-to-busy 2019-06-20 16:52:36 +01:00
i915_gpu_error.h drm/i915: Invert the GEM wakeref hierarchy 2019-04-24 22:26:49 +01:00
i915_ioc32.c
i915_irq.c drm/i915/ehl: Introduce Mule Creek Canyon PCH 2019-06-17 13:40:20 -07:00
i915_irq.h drm/i915/guc: Correctly handle GuC interrupts on Gen11 2019-05-28 10:07:17 +01:00
i915_memcpy.c
i915_mm.c
i915_oa_bdw.c
i915_oa_bdw.h
i915_oa_bxt.c
i915_oa_bxt.h
i915_oa_cflgt2.c
i915_oa_cflgt2.h
i915_oa_cflgt3.c
i915_oa_cflgt3.h
i915_oa_chv.c
i915_oa_chv.h
i915_oa_cnl.c
i915_oa_cnl.h
i915_oa_glk.c
i915_oa_glk.h
i915_oa_hsw.c
i915_oa_hsw.h
i915_oa_icl.c
i915_oa_icl.h
i915_oa_kblgt2.c
i915_oa_kblgt2.h
i915_oa_kblgt3.c
i915_oa_kblgt3.h
i915_oa_sklgt2.c
i915_oa_sklgt2.h
i915_oa_sklgt3.c
i915_oa_sklgt3.h
i915_oa_sklgt4.c
i915_oa_sklgt4.h
i915_params.c drm/i915: add force_probe module parameter to replace alpha_support 2019-05-31 16:20:30 +03:00
i915_params.h drm/i915: add force_probe module parameter to replace alpha_support 2019-05-31 16:20:30 +03:00
i915_pci.c drm/i915: move modesetting core code under display/ 2019-06-17 11:48:32 +03:00
i915_perf.c drm/i915: update rpm_get/put to use the rpm structure 2019-06-14 15:58:33 +01:00
i915_pmu.c drm/i915: update with_intel_runtime_pm to use the rpm structure 2019-06-14 15:58:33 +01:00
i915_pmu.h
i915_priolist_types.h drm/i915: Downgrade NEWCLIENT to non-preemptive 2019-05-20 18:28:22 +03:00
i915_pvinfo.h drm/i915/gvt: decouple check_vgpu() from uncore_init() 2019-06-20 16:34:57 +01:00
i915_query.c Revert "drm/i915: Expand subslice mask" 2019-05-29 17:18:18 +03:00
i915_query.h
i915_reg.h drm/i915/ehl: Allow combo PHY A to drive a third external display 2019-06-19 11:28:02 -07:00
i915_request.c drm/i915/execlists: Preempt-to-busy 2019-06-20 16:52:36 +01:00
i915_request.h drm/i915/execlists: Preempt-to-busy 2019-06-20 16:52:36 +01:00
i915_scatterlist.c drm/i915: Pull scatterlist utils out of i915_gem.h 2019-05-28 12:45:29 +01:00
i915_scatterlist.h drm/i915: Pull scatterlist utils out of i915_gem.h 2019-05-28 12:45:29 +01:00
i915_scheduler.c drm/i915/execlists: Preempt-to-busy 2019-06-20 16:52:36 +01:00
i915_scheduler.h drm/i915: Only reschedule the submission tasklet if preemption is possible 2019-05-07 17:40:20 +01:00
i915_scheduler_types.h drm/i915: Bump signaler priority on adding a waiter 2019-05-20 18:28:04 +03:00
i915_selftest.h
i915_suspend.c drm/i915: move modesetting core code under display/ 2019-06-17 11:48:32 +03:00
i915_sw_fence.c drm/i915: Allow contexts to share a single timeline across all engines 2019-03-22 13:12:38 +00:00
i915_sw_fence.h drm/i915: Allow contexts to share a single timeline across all engines 2019-03-22 13:12:38 +00:00
i915_syncmap.c
i915_syncmap.h
i915_sysfs.c drm/i915: update with_intel_runtime_pm to use the rpm structure 2019-06-14 15:58:33 +01:00
i915_timeline.c drm/i915: Replace engine->timeline with a plain list 2019-06-14 19:03:40 +01:00
i915_timeline.h drm/i915: Replace engine->timeline with a plain list 2019-06-14 19:03:40 +01:00
i915_timeline_types.h drm/i915: Replace engine->timeline with a plain list 2019-06-14 19:03:40 +01:00
i915_trace.h drm/i915: Stop passing I915_WAIT_LOCKED to i915_request_wait() 2019-06-19 12:58:38 +01:00
i915_trace_points.c
i915_user_extensions.c drm/i915: Introduce the i915_user_extension_method 2019-03-22 13:12:30 +00:00
i915_user_extensions.h drm/i915: Introduce the i915_user_extension_method 2019-03-22 13:12:30 +00:00
i915_utils.h drm/i915/execlists: Preempt-to-busy 2019-06-20 16:52:36 +01:00
i915_vgpu.c drm/i915/gvt: decouple check_vgpu() from uncore_init() 2019-06-20 16:34:57 +01:00
i915_vgpu.h drm/i915/gvt: decouple check_vgpu() from uncore_init() 2019-06-20 16:34:57 +01:00
i915_vma.c drm/i915: Use drm_gem_object.resv 2019-06-18 15:30:32 +01:00
i915_vma.h drm/i915: Move fence register tracking from i915->mm to ggtt 2019-06-13 09:37:39 +01:00
intel_csr.c drm/i915/dmc: protect against loading wrong firmware 2019-06-17 12:32:34 -07:00
intel_csr.h drm/i915/csr: move CSR version macros to intel_csr.h 2019-05-03 10:06:25 +03:00
intel_device_info.c drm/i915: Kill INTEL_SUBPLATFORM_AML 2019-06-12 14:51:26 +03:00
intel_device_info.h drm/i915: move modesetting core code under display/ 2019-06-17 11:48:32 +03:00
intel_drv.h drm/i915: move and rename i915_runtime_pm 2019-06-14 15:58:33 +01:00
intel_guc.c drm/i915: Make GuC GGTT reservation work on ggtt 2019-06-11 14:40:15 +01:00
intel_guc.h drm/i915: Make GuC GGTT reservation work on ggtt 2019-06-11 14:40:15 +01:00
intel_guc_ads.c drm/i915/guc: Reset GuC ADS during sanitize 2019-05-28 10:07:05 +01:00
intel_guc_ads.h drm/i915/guc: Reset GuC ADS during sanitize 2019-05-28 10:07:05 +01:00
intel_guc_ct.c drm/i915/guc: always use Command Transport Buffers 2019-06-09 11:21:33 +01:00
intel_guc_ct.h drm/i915/uc: Stop talking with GuC when resetting 2019-05-23 21:58:36 +01:00
intel_guc_fw.c drm/i915/guc: Define GuC firmware version for Icelake 2019-05-28 10:07:22 +01:00
intel_guc_fw.h
intel_guc_fwif.h drm/i915: fix documentation build warnings 2019-06-06 11:13:20 +03:00
intel_guc_log.c drm/i915/guc: Reduce verbosity on log overflows 2019-06-18 11:35:19 +01:00
intel_guc_log.h
intel_guc_reg.h drm/i915/guc: Correctly handle GuC interrupts on Gen11 2019-05-28 10:07:17 +01:00
intel_guc_submission.c drm/i915/execlists: Preempt-to-busy 2019-06-20 16:52:36 +01:00
intel_guc_submission.h drm/i915: Move GraphicsTechnology files under gt/ 2019-04-24 21:01:46 +01:00
intel_gvt.c
intel_gvt.h
intel_huc.c drm/i915: update with_intel_runtime_pm to use the rpm structure 2019-06-14 15:58:33 +01:00
intel_huc.h drm/i915/huc: New HuC status register for Gen11 2019-05-28 10:07:13 +01:00
intel_huc_fw.c drm/i915/huc: Define HuC firmware version for Icelake 2019-05-28 10:07:23 +01:00
intel_huc_fw.h
intel_pm.c drm/i915: move modesetting core code under display/ 2019-06-17 11:48:32 +03:00
intel_pm.h drm/i915: move pm related declarations to intel_pm.h 2019-06-10 10:29:17 +03:00
intel_renderstate.h
intel_renderstate_gen6.c
intel_renderstate_gen7.c
intel_renderstate_gen8.c
intel_renderstate_gen9.c
intel_runtime_pm.c drm/i915: update rpm_get/put to use the rpm structure 2019-06-14 15:58:33 +01:00
intel_runtime_pm.h drm/i915: move modesetting core code under display/ 2019-06-17 11:48:32 +03:00
intel_sideband.c drm/i915: Make sandybridge_pcode_read() deal with the second data register 2019-05-27 20:51:48 +03:00
intel_sideband.h drm/i915: Make sandybridge_pcode_read() deal with the second data register 2019-05-27 20:51:48 +03:00
intel_uc.c drm/i915: update with_intel_runtime_pm to use the rpm structure 2019-06-14 15:58:33 +01:00
intel_uc.h drm/i915/guc: Fix runtime suspend 2019-05-03 08:38:37 +01:00
intel_uc_fw.c drm/i915: Move GEM object domain management from struct_mutex to local 2019-05-28 12:45:29 +01:00
intel_uc_fw.h drm/i915/uc: Place uC firmware in upper range of GGTT 2019-04-20 08:19:32 +01:00
intel_uncore.c drm/i915/gvt: decouple check_vgpu() from uncore_init() 2019-06-20 16:34:57 +01:00
intel_uncore.h drm/i915: dynamically allocate forcewake domains 2019-06-20 16:34:56 +01:00
intel_wakeref.c drm/i915: make intel_wakeref work on the rpm struct 2019-06-14 15:58:33 +01:00
intel_wakeref.h drm/i915: make intel_wakeref work on the rpm struct 2019-06-14 15:58:33 +01:00
intel_wopcm.c drm/i915/wopcm: update default size for gen11+ 2019-06-09 11:28:32 +01:00
intel_wopcm.h drm/i915/guc: Move intel_guc_reserved_gtt_size to intel_wopcm_guc_size 2019-06-11 14:40:14 +01:00
Kconfig drm/i915: add force_probe module parameter to replace alpha_support 2019-05-31 16:20:30 +03:00
Kconfig.debug drm/i915: Enable refcount debugging for default debug levels 2019-06-14 12:16:08 +01:00
Kconfig.profile drm/i915: Add a label for config DRM_I915_SPIN_REQUEST 2019-06-12 11:18:55 +01:00
Makefile drm/i915: move modesetting core code under display/ 2019-06-17 11:48:32 +03:00
Makefile.header-test drm/i915: move modesetting core code under display/ 2019-06-17 11:48:32 +03:00