drm/i915: Split obj->cache_coherent to track r/w
authorChris Wilson <chris@chris-wilson.co.uk>
Fri, 11 Aug 2017 11:11:16 +0000 (12:11 +0100)
committerChris Wilson <chris@chris-wilson.co.uk>
Tue, 15 Aug 2017 14:46:57 +0000 (15:46 +0100)
commitb8f55be64453ea77fc51bff6cd0d906d18ce1cd2
tree4027cbcc167720619217458cf7a7213913f6dc81
parent9c3a16c887f0f8f62813d841f028eabc153581f3
drm/i915: Split obj->cache_coherent to track r/w

Another month, another story in the cache coherency saga. This time, we
come to the realisation that i915_gem_object_is_coherent() has been
reporting whether we can read from the target without requiring a cache
invalidate; but we were using it in places for testing whether we could
write into the object without requiring a cache flush. So split the
tracking into two, one to decide before reads, one after writes.

See commit e27ab73d17ef ("drm/i915: Mark CPU cache as dirty on every
transition for CPU writes") for the previous entry in this saga.

v2: Be verbose
v3: Remove unused function (i915_gem_object_is_coherent)
v4: Fix inverted coherency check prior to execbuf (from v2)
v5: Add comment for nasty code where we are optimising on gcc's behalf.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101109
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101555
Testcase: igt/kms_mmap_write_crc
Testcase: igt/kms_pwrite_crc
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Dongwon Kim <dongwon.kim@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Tested-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Acked-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170811111116.10373-1-chris@chris-wilson.co.uk
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
drivers/gpu/drm/i915/Makefile
drivers/gpu/drm/i915/i915_drv.h
drivers/gpu/drm/i915/i915_gem.c
drivers/gpu/drm/i915/i915_gem_clflush.c
drivers/gpu/drm/i915/i915_gem_execbuffer.c
drivers/gpu/drm/i915/i915_gem_internal.c
drivers/gpu/drm/i915/i915_gem_object.c [new file with mode: 0644]
drivers/gpu/drm/i915/i915_gem_object.h
drivers/gpu/drm/i915/i915_gem_stolen.c
drivers/gpu/drm/i915/i915_gem_userptr.c
drivers/gpu/drm/i915/selftests/huge_gem_object.c