Usually results in (rare) cursor corruptions on platforms
requiring physically addressed cursors.

Note to the stable team: This requires the drm core patch
"drm: add helper to clflush a virtual address range" which
creates the helper used here.

Tested-and-reported-by: Bruno Prémont <bonbons@linu...>
Cc: stable@kern...
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=35460
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=21442
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwl...>
---
drivers/gpu/drm/i915/i915_gem.c |    1 +
1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 39459d2..e395a7d 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4123,6 +4123,7 @@ i915_gem_phys_pwrite(struct drm_device *dev,
return -EFAULT;
}

+ drm_clflush_virt_range(vaddr, args->size);
intel_gtt_chipset_flush();
return 0;
}
--
1.7.7.3

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