[Intel-gfx] [PATCH 4/6] drm/i915/gt: Only invalidate TLBs exposed to user manipulation

[Mauro Carvalho Chehab]

From: Chris Wilson <chris.p.wilson at intel.com>

Don't flush TLBs when the buffer is only used in the GGTT under full
control of the kernel, as there's no risk of of concurrent access
and stale access from prefetch.

We only need to invalidate the TLB if they are accessible by the user.

Fixes: 7938d61591d3 ("drm/i915: Flush TLBs before releasing backing store")

Signed-off-by: Chris Wilson <chris.p.wilson at intel.com>
Cc: Fei Yang <fei.yang at intel.com>
Cc: Andi Shyti <andi.shyti at linux.intel.com>
Cc: stable at vger.kernel.org
Acked-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab at kernel.org>
---

See [PATCH 0/6] at: https://lore.kernel.org/all/cover.1655306128.git.mchehab@kernel.org/

 drivers/gpu/drm/i915/i915_vma.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index 0bffb70b3c5f..7989986161e8 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -537,7 +537,8 @@ int i915_vma_bind(struct i915_vma *vma,
 				   bind_flags);
 	}
 
-	set_bit(I915_BO_WAS_BOUND_BIT, &vma->obj->flags);
+	if (bind_flags & I915_VMA_LOCAL_BIND)
+		set_bit(I915_BO_WAS_BOUND_BIT, &vma->obj->flags);
 
 	atomic_or(bind_flags, &vma->flags);
 	return 0;
-- 
2.36.1