Chris Wilson e22d8e3c69 drm/i915: Treat WC a separate cache domain ...

When discussing a new WC mmap, we based the interface upon the
assumption that GTT was fully coherent. How naive! Commits 3b5724d702ef
("drm/i915: Wait for writes through the GTT to land before reading
back") and ed4596ea992d ("drm/i915/guc: WA to address the Ringbuffer
coherency issue") demonstrate that writes through the GTT are indeed
delayed and may be overtaken by direct WC access. To be safe, if
userspace is mixing WC mmaps with other potential GTT access (pwrite,
GTT mmaps) it should use set_domain(WC).

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96563
Testcase: igt/gem_pwrite/small-gtt*
Testcase: igt/drv_selftest/coherency
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170412110111.26626-2-chris@chris-wilson.co.uk

2017-04-12 12:35:17 +01:00

..

huge_gem_object.c

drm/i915: Create a fake object for testing huge allocations

2017-02-13 20:45:34 +00:00

huge_gem_object.h

drm/i915: Create a fake object for testing huge allocations

2017-02-13 20:45:34 +00:00

i915_gem_coherency.c

drm/i915: Treat WC a separate cache domain

2017-04-12 12:35:17 +01:00

i915_gem_context.c

drm/i915/selftests: Catch error from mock_file()

2017-03-13 13:21:18 +00:00

i915_gem_dmabuf.c

drm/i915: Add a live dmabuf selftest

2017-02-13 20:45:51 +00:00

i915_gem_evict.c

drm/i915/selftests: exercise cache domain eviction

2017-03-09 08:42:39 +00:00

i915_gem_gtt.c

drm/i915/selftests: Fix error path for ggtt walk_hole()

2017-03-13 11:16:09 +00:00

i915_gem_object.c

drm/i915: Combine write_domain flushes to a single function

2017-04-12 12:35:16 +01:00

i915_gem_request.c

drm/i915: Treat WC a separate cache domain

2017-04-12 12:35:17 +01:00

i915_live_selftests.h

drm/i915: Add initial selftests for hang detection and resets

2017-02-13 20:46:53 +00:00

i915_mock_selftests.h

drm/i915: Add mock exercise for i915_gem_gtt_reserve

2017-02-13 20:46:48 +00:00

i915_random.c

…

i915_random.h

…

i915_selftest.c

drivers/gpu/drm/i915/selftests/i915_selftest.c: fix build with gcc-4.4.4

2017-03-10 09:06:10 +00:00

i915_vma.c

drm/i915: Test creation of partial VMA

2017-02-13 20:46:43 +00:00

intel_breadcrumbs.c

drm/i915: Split breadcrumbs spinlock into two

2017-03-03 20:19:13 +00:00

intel_hangcheck.c

drm/i915: Move retire-requests into i915_gem_wait_for_idle()

2017-03-31 12:03:46 +01:00

intel_uncore.c

drm/i915: Sanity check all registers for matching fw domains

2017-02-13 20:45:49 +00:00

mock_context.c

drm/i915: Mock infrastructure for request emission

2017-02-13 20:45:31 +00:00

mock_context.h

drm/i915: Mock infrastructure for request emission

2017-02-13 20:45:31 +00:00

mock_dmabuf.c

drm/i915: Add some mock tests for dmabuf interop

2017-02-13 20:45:50 +00:00

mock_dmabuf.h

drm/i915: Add some mock tests for dmabuf interop

2017-02-13 20:45:50 +00:00

mock_drm.c

drm/i915: Mock the GEM device for self-testing

2017-02-13 20:45:28 +00:00

mock_drm.h

drm/i915: Mock the GEM device for self-testing

2017-02-13 20:45:28 +00:00

mock_engine.c

drm/i915: Generate the engine name based on the instance number

2017-04-11 12:58:10 +01:00

mock_engine.h

drm/i915: Mock infrastructure for request emission

2017-02-13 20:45:31 +00:00

mock_gem_device.c

drm/i915: Mock infrastructure for request emission

2017-02-13 20:45:31 +00:00

mock_gem_device.h

drm/i915: Mock infrastructure for request emission

2017-02-13 20:45:31 +00:00

mock_gem_object.h

drm/i915: Mock the GEM device for self-testing

2017-02-13 20:45:28 +00:00

mock_gtt.c

drm/i915: Mock a GGTT for self-testing

2017-02-13 20:45:30 +00:00

mock_gtt.h

drm/i915: Mock a GGTT for self-testing

2017-02-13 20:45:30 +00:00

mock_request.c

drm/i915: Exercise request cancellation using a mock selftest

2017-02-23 14:50:42 +00:00

mock_request.h

drm/i915: Exercise request cancellation using a mock selftest

2017-02-23 14:50:42 +00:00

scatterlist.c

drm/i915: split out check for noncontiguous pfn range

2017-03-21 10:22:42 +00:00