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linux/drivers/gpu/drm/i915
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Chris Wilson e36ba817fa drm/i915/gt: Incrementally check for rewinding 
In commit 5ba32c7be8 ("drm/i915/execlists: Always force a context
reload when rewinding RING_TAIL"), we placed the check for rewinding a
context on actually submitting the next request in that context. This
was so that we only had to check once, and could do so with precision
avoiding as many forced restores as possible. For example, to ensure
that we can resubmit the same request a couple of times, we include a
small wa_tail such that on the next submission, the ring->tail will
appear to move forwards when resubmitting the same request. This is very
common as it will happen for every lite-restore to fill the second port
after a context switch.

However, intel_ring_direction() is limited in precision to movements of
upto half the ring size. The consequence being that if we tried to
unwind many requests, we could exceed half the ring and flip the sense
of the direction, so missing a force restore. As no request can be
greater than half the ring (i.e. 2048 bytes in the smallest case), we
can check for rollback incrementally. As we check against the tail that
would be submitted, we do not lose any sensitivity and allow lite
restores for the simple case. We still need to double check upon
submitting the context, to allow for multiple preemptions and
resubmissions.

Fixes: 5ba32c7be8 ("drm/i915/execlists: Always force a context reload when rewinding RING_TAIL")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: <stable@vger.kernel.org> # v5.4+
Reviewed-by: Bruce Chang <yu.bruce.chang@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200609151723.12971-1-chris@chris-wilson.co.uk
2020-06-10 15:42:47 +01:00
..
display drm/i915/tc: fix the reset of ln0 2020-06-10 14:17:28 +03:00
gem drm/i915/gem: Delete unused code 2020-06-05 21:46:31 +01:00
gt drm/i915/gt: Incrementally check for rewinding 2020-06-10 15:42:47 +01:00
gvt drm/i915: Drop i915_request.i915 backpointer 2020-06-03 13:53:39 +01:00
selftests drm/i915/gt: Incrementally check for rewinding 2020-06-10 15:42:47 +01:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
i915_active.c drm/i915: Allow asynchronous waits on the i915_active barriers 2020-04-06 19:48:06 +01:00
i915_active.h drm/i915: Allow asynchronous waits on the i915_active barriers 2020-04-06 19:48:06 +01:00
i915_active_types.h
i915_buddy.c drm/i915/buddy: avoid double list_add 2020-03-06 14:33:08 +00:00
i915_buddy.h
i915_cmd_parser.c drm/i915: Whitelist context-local timestamp in the gen9 cmdparser 2020-06-01 20:14:25 +01:00
i915_config.c drm/i915: Replace the hardcoded I915_FENCE_TIMEOUT 2020-05-09 12:57:57 +01:00
i915_debugfs.c drm/i915: Extract i915_cs_timestamp_{ns_to_ticks,tick_to_ns}() 2020-05-14 20:04:02 +03:00
i915_debugfs.h drm/i915: split out display debugfs to a separate file 2020-02-14 13:26:51 +02:00
i915_debugfs_params.c drm/i915: Include the debugfs params header for its own definition 2020-01-17 13:00:16 +00:00
i915_debugfs_params.h drm/i915/params: add i915 parameters to debugfs 2020-01-15 15:10:16 +02:00
i915_drv.c drm/i915: Refactor setting dma info to a common helper 2020-04-18 07:49:11 +01:00
i915_drv.h drm/i915/rkl: Disable PSR2 2020-06-04 14:04:43 -07:00
i915_fixed.h
i915_gem.c drm/i915: Correct discard i915_vma_compare assertion 2020-06-05 20:22:31 +01:00
i915_gem.h i915 features for v5.6: 2019-12-27 15:25:04 +10:00
i915_gem_evict.c drm/i915: Handle idling during i915_gem_evict_something busy loops 2020-05-12 13:02:03 +01:00
i915_gem_gtt.c drm/i915: significantly reduce the use of <drm/i915_drm.h> 2020-02-27 08:35:09 +02:00
i915_gem_gtt.h drm/i915: Remove PIN_UPDATE for i915_vma_pin 2020-05-21 17:33:51 +01:00
i915_getparam.c drm/i915: Store CS timestamp frequency in Hz 2020-05-14 19:59:53 +03:00
i915_globals.c drm/i915: Ratelimit i915_globals_park 2019-12-18 17:38:56 +00:00
i915_globals.h
i915_gpu_error.c drm/i915/gt: Keep a no-frills swappable copy of the default context state 2020-04-29 19:02:37 +01:00
i915_gpu_error.h drm/i915: Replace zero-length array with flexible-array 2020-05-09 12:59:23 +01:00
i915_ioc32.c drm/i915: add i915_ioc32.h for compat 2020-03-02 13:32:37 +02:00
i915_ioc32.h drm/i915: add i915_ioc32.h for compat 2020-03-02 13:32:37 +02:00
i915_irq.c drm/i915/rkl: Don't try to access transcoder D 2020-06-04 14:00:23 -07:00
i915_irq.h drm/i915: Convert to CRTC VBLANK callbacks 2020-02-13 13:08:13 +01:00
i915_memcpy.c drm/i915: remove always-defined CONFIG_AS_MOVNTDQA 2020-04-09 00:01:59 +09:00
i915_memcpy.h
i915_mm.c drm/i915/gem: Extend mmap support for lmem 2020-01-04 17:57:46 +00:00
i915_params.c drm/i915: Add psr_safest_params 2020-06-04 19:36:48 -07:00
i915_params.h drm/i915: Add psr_safest_params 2020-06-04 19:36:48 -07:00
i915_pci.c drm/i915/rkl: RKL uses ABOX0 for pixel transfers 2020-06-09 10:25:19 -07:00
i915_perf.c drm/i915: Extract i915_cs_timestamp_{ns_to_ticks,tick_to_ns}() 2020-05-14 20:04:02 +03:00
i915_perf.h drm/i915/perf: Register sysctl path globally 2019-12-13 20:16:23 +00:00
i915_perf_types.h drm/i915/perf: Schedule oa_config after modifying the contexts 2020-03-30 18:20:34 +01:00
i915_pmu.c drm/i915/pmu: avoid an maybe-uninitialized warning 2020-05-27 17:07:24 +01:00
i915_pmu.h drm/i915: significantly reduce the use of <drm/i915_drm.h> 2020-02-27 08:35:09 +02:00
i915_priolist_types.h drm/i915/gt: Prevent timeslicing into unpreemptable requests 2020-05-28 09:59:27 +01:00
i915_pvinfo.h
i915_query.c
i915_query.h
i915_reg.h drm/i915/rkl: RKL uses ABOX0 for pixel transfers 2020-06-09 10:25:19 -07:00
i915_request.c drm/i915: Drop i915_request.i915 backpointer 2020-06-03 13:53:39 +01:00
i915_request.h drm/i915: Drop i915_request.i915 backpointer 2020-06-03 13:53:39 +01:00
i915_scatterlist.c
i915_scatterlist.h
i915_scheduler.c drm/i915: Don't set queue-priority hint when supressing the reschedule 2020-05-19 15:28:26 +01:00
i915_scheduler.h drm/i915: Mark concurrent submissions with a weak-dependency 2020-05-07 19:49:21 +01:00
i915_scheduler_types.h drm/i915: Drop no-semaphore boosting 2020-05-14 06:14:33 +01:00
i915_selftest.h drm/i915/gem: Implement legacy MI_STORE_DATA_IMM 2020-05-04 15:15:04 +01:00
i915_suspend.c drm/i915: significantly reduce the use of <drm/i915_drm.h> 2020-02-27 08:35:09 +02:00
i915_suspend.h
i915_sw_fence.c drm/i915: Tidy awaiting on dma-fences 2020-05-11 12:56:45 +01:00
i915_sw_fence.h drm/i915/gem: Don't leak non-persistent requests on changing engines 2020-02-11 21:58:39 +00:00
i915_sw_fence_work.c drm/i915: Immediately execute the fenced work 2020-03-25 13:05:04 +00:00
i915_sw_fence_work.h drm/i915: Immediately execute the fenced work 2020-03-25 13:05:04 +00:00
i915_switcheroo.c drm/i915/switcheroo: use struct drm_device based logging 2020-04-08 13:49:35 +03:00
i915_switcheroo.h
i915_syncmap.c
i915_syncmap.h
i915_sysfs.c drm/i915/gt: Expose engine properties via sysfs 2020-02-28 22:03:19 +00:00
i915_sysfs.h
i915_trace.h drm/i915: Drop i915_request.i915 backpointer 2020-06-03 13:53:39 +01:00
i915_trace_points.c
i915_user_extensions.c
i915_user_extensions.h
i915_utils.c drm/i915: Trim set_timer_ms() intervals 2020-06-04 16:34:00 +01:00
i915_utils.h drm/i915: be more solid in checking the alignment 2020-03-11 23:12:39 +02:00
i915_vgpu.c drm/i915/vgpu: improve vgpu abstractions 2020-03-03 17:46:54 +02:00
i915_vgpu.h drm/i915/vgpu: improve vgpu abstractions 2020-03-03 17:46:54 +02:00
i915_vma.c drm/i915/gt: Remove local entries from GGTT on suspend 2020-05-28 16:55:15 +01:00
i915_vma.h drm/i915/gt: Remove local entries from GGTT on suspend 2020-05-28 16:55:15 +01:00
i915_vma_types.h drm/i915/gem: Extract transient execbuf flags from i915_vma 2020-03-03 21:52:51 +00:00
intel_device_info.c drm/i915: Identify Cometlake platform 2020-06-02 23:15:34 +01:00
intel_device_info.h drm/i915/rkl: RKL uses ABOX0 for pixel transfers 2020-06-09 10:25:19 -07:00
intel_dram.c drm/i915/dram: prefer struct drm_device based logging 2020-04-08 13:49:35 +03:00
intel_dram.h drm/i915: split out intel_dram.[ch] from i915_drv.c 2020-02-27 09:16:01 +02:00
intel_gvt.c drm/i915: Identify Cometlake platform 2020-06-02 23:15:34 +01:00
intel_gvt.h
intel_memory_region.c drm/i915: convert to new logging macros in i915/intel_memory_region.c 2020-01-17 17:44:19 +02:00
intel_memory_region.h drm/i915: lookup for mem_region of a mem_type 2020-01-05 01:08:09 +00:00
intel_pch.c drm/i915: Identify Cometlake platform 2020-06-02 23:15:34 +01:00
intel_pch.h
intel_pm.c drm/i915: Identify Cometlake platform 2020-06-02 23:15:34 +01:00
intel_pm.h drm/i915: Fix includes and local vars order 2020-05-22 14:40:35 +01:00
intel_region_lmem.c drm/i915/lmem: use new struct drm_device based logging macros. 2020-01-10 16:11:04 +02:00
intel_region_lmem.h
intel_runtime_pm.c drm/i915/runtime_pm: Prefer drm_WARN* over WARN* 2020-05-19 16:01:40 +03:00
intel_runtime_pm.h
intel_sideband.c drm/i915: Added required new PCode commands 2020-05-05 13:59:55 +03:00
intel_sideband.h
intel_uncore.c drm/i915: Relinquish forcewake immediately after manual grouping 2020-06-01 13:29:05 +01:00
intel_uncore.h drm/i915/selftests: Measure the energy consumed while in RC6 2020-03-25 11:33:05 +00:00
intel_wakeref.c drm/i915: Extend intel_wakeref to support delayed puts 2020-03-23 12:51:05 +00:00
intel_wakeref.h drm/i915: Extend intel_wakeref to support delayed puts 2020-03-23 12:51:05 +00:00
intel_wopcm.c drm/i915: Remove cnl pre-prod workarounds 2020-05-04 18:44:52 +03:00
intel_wopcm.h
Kconfig drm/i915: Update drm/i915 bug filing URL 2020-02-17 21:16:45 +02:00
Kconfig.debug
Kconfig.profile drm/i915: Replace the hardcoded I915_FENCE_TIMEOUT 2020-05-09 12:57:57 +01:00
Kconfig.unstable
Makefile drm/i915/gt: Split low level gen2-7 CS emitters 2020-06-02 10:42:00 +01:00
vlv_suspend.c drm/i915: switch vlv_suspend to use intel uncore register accessors 2020-02-17 11:29:51 +02:00
vlv_suspend.h drm/i915: split out vlv/chv specific suspend/resume code 2020-02-17 11:29:35 +02:00