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0d4bbe3d40
linux_dsm_epyc7002/drivers/gpu/drm/i915
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Chris Wilson 0d4bbe3d40 drm/i915/userptr: Try to acquire the page lock around set_page_dirty() 
set_page_dirty says:

	For pages with a mapping this should be done under the page lock
	for the benefit of asynchronous memory errors who prefer a
	consistent dirty state. This rule can be broken in some special
	cases, but should be better not to.

Under those rules, it is only safe for us to use the plain set_page_dirty
calls for shmemfs/anonymous memory. Userptr may be used with real
mappings and so needs to use the locked version (set_page_dirty_lock).

However, following a try_to_unmap() we may want to remove the userptr and
so call put_pages(). However, try_to_unmap() acquires the page lock and
so we must avoid recursively locking the pages ourselves -- which means
that we cannot safely acquire the lock around set_page_dirty(). Since we
can't be sure of the lock, we have to risk skip dirtying the page, or
else risk calling set_page_dirty() without a lock and so risk fs
corruption.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=203317
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=112012
Fixes: 5cc9ed4b9a ("drm/i915: Introduce mapping of user pages into video memory (userptr) ioctl")
References: cb6d7c7dc7 ("drm/i915/userptr: Acquire the page lock around set_page_dirty()")
References: 505a8ec7e1 ("Revert "drm/i915/userptr: Acquire the page lock around set_page_dirty()"")
References: 6dcc693bc5 ("ext4: warn when page is dirtied without buffers")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: stable@vger.kernel.org
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191111133205.11590-1-chris@chris-wilson.co.uk
2019-11-11 15:44:25 +00:00
..
display drm/i915: Split a setting of MSA to MST and SST 2019-11-11 16:25:16 +02:00
gem drm/i915/userptr: Try to acquire the page lock around set_page_dirty() 2019-11-11 15:44:25 +00:00
gt drm/i915/execlists: Reduce barrier on context switch to a wmb() 2019-11-11 13:27:03 +00:00
gvt drm/i915: make more headers self-contained 2019-11-08 10:16:13 +00:00
oa drm/i915/tgl: Add perf support on TGL 2019-10-29 12:53:54 +02:00
selftests drm/i915/selftests: Complete transition to a real struct file mock 2019-11-08 10:17:41 +00:00
i915_active_types.h drm/i915: Coordinate i915_active with its own mutex 2019-10-04 15:39:12 +01:00
i915_active.c drm/i915/gt: Split intel_ring_submission 2019-10-24 12:14:21 +01:00
i915_active.h drm/i915/selftests: Flush all active callbacks 2019-11-02 08:34:53 +00:00
i915_buddy.c drm/i915/buddy: add missing call to i915_global_register 2019-09-09 10:58:20 +01:00
i915_buddy.h
i915_cmd_parser.c
i915_debugfs.c drm/i915: Perform automated conversions for crtc uapi/hw split, base -> uapi. 2019-11-01 14:51:21 +01:00
i915_debugfs.h
i915_drv.c drm/i915/selftests: Complete transition to a real struct file mock 2019-11-08 10:17:41 +00:00
i915_drv.h drm/i915/gt: Call intel_gt_sanitize() directly 2019-11-01 14:47:36 +00:00
i915_fixed.h
i915_gem_evict.c drm/i915: Move request runtime management onto gt 2019-10-04 15:39:26 +01:00
i915_gem_fence_reg.c drm/i915: set num_fence_regs to 0 if there is no aperture 2019-10-29 10:35:47 +00:00
i915_gem_fence_reg.h drm/i915: Store i915_ggtt as the backpointer on fence registers 2019-10-16 19:41:36 +01:00
i915_gem_gtt.c drm/i915: Leave the aliasing-ppgtt size alone 2019-11-07 10:52:14 +00:00
i915_gem_gtt.h drm/i915: define i915_ggtt_has_aperture 2019-10-29 10:31:40 +00:00
i915_gem.c drm/i915/gt: Call intel_gt_sanitize() directly 2019-11-01 14:47:36 +00:00
i915_gem.h drm/i915: Taint the kernel on dumping the GEM ftrace buffer 2019-11-11 12:46:12 +00:00
i915_getparam.c drm/i915/perf: introduce a versioning of the i915-perf uapi 2019-10-14 21:30:25 +01:00
i915_globals.c
i915_globals.h
i915_gpu_error.c drm/i915: Remove unwanted rcu_read_lock/unlock 2019-11-06 22:12:45 +00:00
i915_gpu_error.h drm/i915/tgl: Add gam instdone 2019-10-30 09:15:27 +00:00
i915_ioc32.c
i915_irq.c drm/i915/tgl: Handle AUX interrupts for TC ports 2019-10-28 08:27:04 -07:00
i915_irq.h drm/i915: Extract the GuC interrupt handlers 2019-10-26 19:28:59 +01:00
i915_memcpy.c
i915_memcpy.h
i915_mm.c
i915_params.c drm/i915/lmem: add the fake lmem region 2019-10-31 20:41:47 +00:00
i915_params.h drm/i915/lmem: add the fake lmem region 2019-10-31 20:41:47 +00:00
i915_pci.c drm/i915/display/cnl+: Handle fused off DSC 2019-10-29 12:12:49 -07:00
i915_perf_types.h drm/i915/perf: Describe structure members in documentation 2019-10-24 15:01:35 +01:00
i915_perf.c drm/i915/perf: always consider holding preemption a privileged op 2019-11-11 12:14:01 +02:00
i915_perf.h drm/i915/perf: introduce a versioning of the i915-perf uapi 2019-10-14 21:30:25 +01:00
i915_pmu.c drm/i915/pmu: "Frequency" is reported as accumulated cycles 2019-11-11 11:59:12 +00:00
i915_pmu.h drm/i915/pmu: Support multiple GPUs 2019-10-17 10:50:47 +01:00
i915_priolist_types.h drm/i915/gt: Replace hangcheck by heartbeats 2019-10-23 23:52:10 +01:00
i915_pvinfo.h
i915_query.c drm/i915: add support for perf configuration queries 2019-10-14 21:30:26 +01:00
i915_query.h
i915_reg.h drm/i915: Expose C8 on VLV/CHV sprite planes 2019-11-04 17:59:06 +02:00
i915_request.c drm/i915: Extract GT render power state management 2019-10-26 19:28:59 +01:00
i915_request.h drm/i915: Mark up "sentinel" requests 2019-10-12 08:51:17 +01:00
i915_scatterlist.c
i915_scatterlist.h drm/i915: s/for_each_sgt_dma/for_each_sgt_daddr/ 2019-08-29 21:59:16 +01:00
i915_scheduler_types.h drm/i915: Note the addition of timeslicing to the pretend scheduler 2019-10-11 09:36:16 +01:00
i915_scheduler.c drm/i915: Protect request peeking with RCU 2019-11-04 10:01:36 +00:00
i915_scheduler.h drm/i915/execlists: Don't merely skip submission if maybe timeslicing 2019-10-18 11:23:26 +01:00
i915_selftest.h
i915_suspend.c drm/i915: Drop struct_mutex from suspend state save/restore 2019-10-04 15:39:41 +01:00
i915_suspend.h
i915_sw_fence_work.c drm/i915: Generalise the clflush dma-worker 2019-08-22 08:27:44 +01:00
i915_sw_fence_work.h drm/i915: Generalise the clflush dma-worker 2019-08-22 08:27:44 +01:00
i915_sw_fence.c Merge drm/drm-next into drm-intel-next-queued 2019-08-22 00:10:36 -07:00
i915_sw_fence.h Merge drm/drm-next into drm-intel-next-queued 2019-08-22 00:10:36 -07:00
i915_switcheroo.c drm/i915: split out i915_switcheroo.[ch] from i915_drv.c 2019-10-06 11:25:00 +03:00
i915_switcheroo.h drm/i915: split out i915_switcheroo.[ch] from i915_drv.c 2019-10-06 11:25:00 +03:00
i915_syncmap.c
i915_syncmap.h
i915_sysfs.c drm/i915: Extract GT render power state management 2019-10-26 19:28:59 +01:00
i915_sysfs.h
i915_trace_points.c
i915_trace.h drm/i915: Move context management under GEM 2019-10-04 15:39:34 +01:00
i915_user_extensions.c
i915_user_extensions.h
i915_utils.c drm/i915: Rename "inject_load_failure" module parameter 2019-10-29 15:37:57 +00:00
i915_utils.h drm/i915: Fix i915_inject_load_error() name to read *_probe_* 2019-10-29 15:37:57 +00:00
i915_vgpu.c drm/i915: to make vgpu ppgtt notificaiton as atomic operation 2019-09-06 09:53:12 -07:00
i915_vgpu.h
i915_vma.c drm/i915: Split detaching and removing the vma 2019-10-31 14:52:19 +00:00
i915_vma.h drm/i915: Lift i915_vma_parked() onto the gt 2019-10-21 21:07:56 +01:00
intel_csr.c drm/i915/dmc: Update ICL DMC version to v1.09 2019-09-27 10:20:39 -07:00
intel_csr.h
intel_device_info.c drm/i915/display/cnl+: Handle fused off DSC 2019-10-29 12:12:49 -07:00
intel_device_info.h drm/i915/display/cnl+: Handle fused off DSC 2019-10-29 12:12:49 -07:00
intel_gvt.c
intel_gvt.h
intel_memory_region.c drm/i915/lmem: add the fake lmem region 2019-10-31 20:41:47 +00:00
intel_memory_region.h drm/i915/lmem: add the fake lmem region 2019-10-31 20:41:47 +00:00
intel_pch.c drm/i915/tgl: Add second TGL PCH ID 2019-11-06 16:15:27 -08:00
intel_pch.h drm/i915/tgl: Add second TGL PCH ID 2019-11-06 16:15:27 -08:00
intel_pm.c drm/i915: Perform automated conversions for plane uapi/hw split, base -> uapi. 2019-11-01 14:51:21 +01:00
intel_pm.h drm/i915: Extract GT render power state management 2019-10-26 19:28:59 +01:00
intel_region_lmem.c drm/i915/lmem: fixup fake lmem teardown 2019-11-06 14:34:10 +00:00
intel_region_lmem.h drm/i915/lmem: add the fake lmem region 2019-10-31 20:41:47 +00:00
intel_runtime_pm.c drm/i915/display: abstract all vgaarb access to intel_vga.[ch] 2019-10-02 13:31:54 +03:00
intel_runtime_pm.h
intel_sideband.c
intel_sideband.h
intel_uncore.c drm/i915/tgl: Introduce gen12 forcewake ranges 2019-09-13 20:07:36 +01:00
intel_uncore.h drm/i915: Only apply a rmw mmio update if the value changes 2019-09-17 15:25:40 +01:00
intel_wakeref.c
intel_wakeref.h
intel_wopcm.c drm/i915/wopcm: Fix SPDX tag location 2019-08-16 16:50:03 +01:00
intel_wopcm.h
Kconfig drm/i915: Put future HW and their uAPIs under STAGING & BROKEN 2019-10-27 15:47:10 +00:00
Kconfig.debug drm/i915/selftests: Replace mock_file hackery with drm's true fake 2019-11-07 21:22:16 +00:00
Kconfig.profile drm/i915/gt: Make timeslice duration configurable 2019-10-29 16:23:55 +00:00
Kconfig.unstable drm/i915/lmem: add the fake lmem region 2019-10-31 20:41:47 +00:00
Makefile drm/i915/selftests: Wrap vm_mmap() around GEM objects 2019-11-07 21:22:58 +00:00