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bianbu-linux-6.6/drivers/gpu/drm/i915
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Umesh Nerlige Ramappa 7d73c60215 drm/i915/pmu: Fix KMD and GuC race on accessing busyness 
GuC updates shared memory and KMD reads it. Since this is not
synchronized, we run into a race where the value read is inconsistent.
Sometimes the inconsistency is in reading the upper MSB bytes of the
last_switch_in value. 2 types of cases are seen - upper 8 bits are zero
and upper 24 bits are zero. Since these are non-zero values, it is
not trivial to determine validity of these values. Instead we read the
values multiple times until they are consistent. In test runs, 3
attempts results in consistent values. The upper bound is set to 6
attempts and may need to be tuned as per any new occurences.

Since the duration that gt is parked can vary, the patch also updates
the gt timestamp on unpark before starting the worker.

v2:
- Initialize i
- Use READ_ONCE to access engine record

Fixes: 77cdd054dd ("drm/i915/pmu: Connect engine busyness stats from GuC to pmu")
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Reviewed-by: Alan Previn <alan.previn.teres.alexis@intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220125020124.788679-2-umesh.nerlige.ramappa@intel.com
(cherry picked from commit 512712a824)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
2022-02-01 08:59:25 +00:00
..
display drm/i915/adlp: Fix TypeC PHY-ready status readout 2022-01-31 09:35:11 +00:00
gem drm/i915: Lock timeline mutex directly in error path of eb_pin_timeline 2022-01-31 09:34:54 +00:00
gt drm/i915/pmu: Fix KMD and GuC race on accessing busyness 2022-02-01 08:59:25 +00:00
gvt Merge tag 'drm-intel-gt-next-2021-12-23' of git://anongit.freedesktop.org/drm/drm-intel into drm-next 2021-12-24 06:14:51 +10:00
pxp drm/i915/pxp: Hold RPM wakelock during PXP unbind 2022-01-10 13:54:53 +00:00
selftests drm/i915: Ensure i915_vma tests do not get -ENOSPC with the locking changes. 2021-12-20 16:34:20 +01:00
.gitignore
i915_active.c drm/i915: Remove unused bits of i915_vma/active api 2021-12-20 16:26:09 +01:00
i915_active.h drm/i915: Remove unused bits of i915_vma/active api 2021-12-20 16:26:09 +01:00
i915_active_types.h drm/i915/active: remove useless i915_utils.h include 2021-12-13 12:04:44 +02:00
i915_buddy.c drm/i915/buddy: add some pretty printing 2021-08-20 09:40:22 +01:00
i915_buddy.h drm/i915/buddy: add some pretty printing 2021-08-20 09:40:22 +01:00
i915_cmd_parser.c drm/i915: Correct the docs for intel_engine_cmd_parser 2021-07-21 11:49:36 -04:00
i915_config.c drm/i915: remove IS_ACTIVE 2021-10-07 11:04:05 -07:00
i915_debugfs.c Merge tag 'drm-intel-gt-next-2021-12-23' of git://anongit.freedesktop.org/drm/drm-intel into drm-next 2021-12-24 06:14:51 +10:00
i915_debugfs.h
i915_debugfs_params.c drm/i915: Use to_gt() helper 2021-12-17 21:51:59 -08:00
i915_debugfs_params.h
i915_deps.c drm/i915: Break out the i915_deps utility 2021-12-22 08:52:57 +01:00
i915_deps.h drm/i915: Break out the i915_deps utility 2021-12-22 08:52:57 +01:00
i915_driver.c Merge tag 'drm-intel-gt-next-2021-12-23' of git://anongit.freedesktop.org/drm/drm-intel into drm-next 2021-12-24 06:14:51 +10:00
i915_driver.h drm/i915/driver: add i915_driver_ prefix to functions 2021-11-17 11:47:55 +02:00
i915_drv.h Merge tag 'drm-intel-gt-next-2021-12-23' of git://anongit.freedesktop.org/drm/drm-intel into drm-next 2021-12-24 06:14:51 +10:00
i915_fixed.h
i915_gem.c drm/i915: Force ww lock for i915_gem_object_ggtt_pin_ww, v2. 2021-12-20 16:33:03 +01:00
i915_gem.h
i915_gem_evict.c drm/i915/guc: Update intel_gt_wait_for_idle to work with GuC 2021-07-22 10:07:23 -07:00
i915_gem_gtt.c drm/i915: Use direction definition DMA_BIDIRECTIONAL instead of PCI_DMA_BIDIRECTIONAL 2021-09-30 16:19:45 +02:00
i915_gem_gtt.h
i915_gem_ww.c
i915_gem_ww.h drm/i915: Ditch the i915_gem_ww_ctx loop member 2021-08-20 09:39:41 +01:00
i915_getparam.c drm/i915: Use to_gt() helper 2021-12-17 21:51:59 -08:00
i915_gpu_error.c drm/i915: Allocate intel_engine_coredump_alloc with ALLOW_FAIL 2022-01-31 09:34:50 +00:00
i915_gpu_error.h drm/i915: Avoid allocating a page array for the gpu coredump 2021-11-26 08:26:08 +01:00
i915_ioc32.c
i915_ioc32.h
i915_iosf_mbi.h drm/i915: abstraction for iosf to compile on all archs 2021-10-27 00:32:01 -07:00
i915_irq.c Merge tag 'drm-intel-gt-next-2021-12-23' of git://anongit.freedesktop.org/drm/drm-intel into drm-next 2021-12-24 06:14:51 +10:00
i915_irq.h drm/i915/irq: reduce inlines to reduce header dependencies 2021-08-20 10:28:31 +03:00
i915_memcpy.c
i915_memcpy.h
i915_mitigations.c
i915_mitigations.h
i915_mm.c drm/i915: Skip remap_io_mapping() for non-x86 platforms 2021-12-08 13:26:14 -08:00
i915_mm.h drm/i915: Skip remap_io_mapping() for non-x86 platforms 2021-12-08 13:26:14 -08:00
i915_module.c drm-misc-next for 5.17: 2021-12-09 09:31:45 +01:00
i915_params.c drm/i915: Test all device memory on probing 2021-12-14 15:08:20 +05:30
i915_params.h drm/i915: Test all device memory on probing 2021-12-14 15:08:20 +05:30
i915_pci.c Merge tag 'drm-intel-gt-next-2021-12-23' of git://anongit.freedesktop.org/drm/drm-intel into drm-next 2021-12-24 06:14:51 +10:00
i915_pci.h drm/i915/pci: rename functions to have i915_pci prefix 2021-08-26 10:50:19 +03:00
i915_perf.c i915: simplify subdirectory registration with register_sysctl() 2022-01-22 08:33:34 +02:00
i915_perf.h drm/i915: Use a table for i915_init/exit (v2) 2021-07-22 12:05:17 +02:00
i915_perf_types.h
i915_pmu.c drm/i915: Use to_gt() helper 2021-12-17 21:51:59 -08:00
i915_pmu.h drm/i915: Use a table for i915_init/exit (v2) 2021-07-22 12:05:17 +02:00
i915_priolist_types.h
i915_pvinfo.h
i915_query.c drm/i915: Use to_gt() helper 2021-12-17 21:51:59 -08:00
i915_query.h
i915_reg.h drm/i915/pmu: Use PM timestamp instead of RING TIMESTAMP for reference 2022-01-31 09:35:05 +00:00
i915_request.c Merge tag 'drm-intel-gt-next-2021-12-23' of git://anongit.freedesktop.org/drm/drm-intel into drm-next 2021-12-24 06:14:51 +10:00
i915_request.h drm/i915: Avoid using the i915_fence_array when collecting dependencies 2021-12-22 08:14:30 +01:00
i915_scatterlist.c drm/i915: Introduce refcounted sg-tables 2021-11-01 18:10:49 +01:00
i915_scatterlist.h drm/i915: Introduce refcounted sg-tables 2021-11-01 18:10:49 +01:00
i915_scheduler.c drm/i915: move scheduler slabs to direct module init/exit 2021-07-28 17:18:56 +02:00
i915_scheduler.h drm/i915: move scheduler slabs to direct module init/exit 2021-07-28 17:18:56 +02:00
i915_scheduler_types.h drm/i915/guc: Implement GuC priority management 2021-07-27 17:32:27 -07:00
i915_selftest.h
i915_suspend.c
i915_suspend.h
i915_sw_fence.c drm/i915: Drop stealing of bits from i915_sw_fence function pointer 2021-11-30 17:52:15 -08:00
i915_sw_fence.h drm/i915: Drop stealing of bits from i915_sw_fence function pointer 2021-11-30 17:52:15 -08:00
i915_sw_fence_work.c drm/i915: Drop stealing of bits from i915_sw_fence function pointer 2021-11-30 17:52:15 -08:00
i915_sw_fence_work.h drm/i915: Drop error handling from dma_fence_work 2021-07-16 21:47:39 +02:00
i915_switcheroo.c drm/i915/driver: add i915_driver_ prefix to functions 2021-11-17 11:47:55 +02:00
i915_switcheroo.h
i915_syncmap.c
i915_syncmap.h
i915_sysfs.c drm/i915: Use to_gt() helper 2021-12-17 21:51:59 -08:00
i915_sysfs.h
i915_trace.h drm/i915/trace: split out display trace to a separate file 2021-12-09 11:21:46 +02:00
i915_trace_points.c
i915_ttm_buddy_manager.c drm/i915/buddy: add some pretty printing 2021-08-20 09:40:22 +01:00
i915_ttm_buddy_manager.h drm/i915: support forcing the page size with lmem 2021-06-30 13:24:29 +01:00
i915_user_extensions.c
i915_user_extensions.h
i915_utils.c
i915_utils.h drm for 5.16-rc1 2021-11-02 16:47:49 -07:00
i915_vgpu.c
i915_vgpu.h
i915_vma.c drm/i915: Flush TLBs before releasing backing store 2022-01-25 20:06:06 +02:00
i915_vma.h drm/i915: Remove pages_mutex and intel_gtt->vma_ops.set/clear_pages members, v3. 2021-12-20 16:31:02 +01:00
i915_vma_snapshot.c drm/i915: Update error capture code to avoid using the current vma state 2021-12-01 16:53:22 +01:00
i915_vma_snapshot.h drm/i915: Update error capture code to avoid using the current vma state 2021-12-01 16:53:22 +01:00
i915_vma_types.h Merge tag 'drm-intel-gt-next-2021-12-23' of git://anongit.freedesktop.org/drm/drm-intel into drm-next 2021-12-24 06:14:51 +10:00
intel_device_info.c Merge tag 'drm-intel-next-2021-12-14' of ssh://git.freedesktop.org/git/drm/drm-intel into drm-next 2021-12-17 15:23:49 +10:00
intel_device_info.h Merge tag 'drm-intel-gt-next-2021-12-23' of git://anongit.freedesktop.org/drm/drm-intel into drm-next 2021-12-24 06:14:51 +10:00
intel_dram.c drm/i915: Remove memory frequency calculation 2021-10-19 10:45:52 +03:00
intel_dram.h
intel_gvt.c drm/i915: Use to_gt() helper 2021-12-17 21:51:59 -08:00
intel_gvt.h
intel_memory_region.c drm/i915: Test all device memory on probing 2021-12-14 15:08:20 +05:30
intel_memory_region.h drm/i915/ttm: Drop region reference counting 2021-11-25 09:36:16 +01:00
intel_pch.c drm/i915/rpl-s: Add PCH Support for Raptor Lake S 2021-12-08 13:03:04 -08:00
intel_pch.h drm/i915/rpl-s: Add PCH Support for Raptor Lake S 2021-12-08 13:03:04 -08:00
intel_pcode.c drm/i915: split out intel_pcode.[ch] to separate file 2021-10-14 18:04:17 +03:00
intel_pcode.h drm/i915: split out intel_pcode.[ch] to separate file 2021-10-14 18:04:17 +03:00
intel_pm.c Merge tag 'drm-intel-next-2021-12-14' of ssh://git.freedesktop.org/git/drm/drm-intel into drm-next 2021-12-17 15:23:49 +10:00
intel_pm.h drm/i915/wm: provide wrappers around watermark vfuncs calls (v3) 2021-09-29 08:53:57 +03:00
intel_pm_types.h drm/i915: split out intel_pm_types.h 2021-12-03 11:28:12 +02:00
intel_region_ttm.c drm/i915/ttm: Drop region reference counting 2021-11-25 09:36:16 +01:00
intel_region_ttm.h drm/i915/ttm: Drop region reference counting 2021-11-25 09:36:16 +01:00
intel_runtime_pm.c lib/stackdepot: allow optional init and stack_table allocation by kvmalloc() 2022-01-22 08:33:37 +02:00
intel_runtime_pm.h drm/i915: intel_runtime_pm.h does not actually need intel_display.h 2021-08-20 10:28:49 +03:00
intel_sbi.c drm/i915: rename intel_sideband.[ch] to intel_sbi.[ch] 2021-10-14 18:05:04 +03:00
intel_sbi.h drm/i915: rename intel_sideband.[ch] to intel_sbi.[ch] 2021-10-14 18:05:04 +03:00
intel_step.c drm/i915: Rename GT_STEP to GRAPHICS_STEP 2021-11-02 13:05:40 -07:00
intel_step.h drm/i915: Rename GT_STEP to GRAPHICS_STEP 2021-11-02 13:05:40 -07:00
intel_uncore.c drm/i915: Flush TLBs before releasing backing store 2022-01-25 20:06:06 +02:00
intel_uncore.h drm/i915: Flush TLBs before releasing backing store 2022-01-25 20:06:06 +02:00
intel_wakeref.c
intel_wakeref.h drm/i915/guc: Take engine PM when a context is pinned with GuC submission 2021-10-15 10:37:26 -07:00
intel_wopcm.c drm/i915: Use to_gt() helper 2021-12-17 21:51:59 -08:00
intel_wopcm.h
Kconfig Merge drm/drm-next into drm-intel-next 2021-11-22 17:35:32 +02:00
Kconfig.debug drm/i915: Improve debug Kconfig texts a bit 2021-07-06 10:10:07 +02:00
Kconfig.profile
Kconfig.unstable
Makefile Merge tag 'drm-intel-gt-next-2021-12-23' of git://anongit.freedesktop.org/drm/drm-intel into drm-next 2021-12-24 06:14:51 +10:00
TODO.txt
vlv_sideband.c drm/i915: abstraction for iosf to compile on all archs 2021-10-27 00:32:01 -07:00
vlv_sideband.h drm/i915: split out vlv sideband to a separate file 2021-10-14 12:22:55 +03:00
vlv_suspend.c
vlv_suspend.h