[Intel-gfx] [PATCH] drm/i915: Always mark the object as dirty when used by the GPU

[Chris Wilson]

There have been many hard to track down bugs whereby userspace forgot to
flag a write buffer and then cause graphics corruption or a hung GPU
when that buffer was later purged under memory pressure (as the buffer
appeared clean, its pages would have been evicted rather than preserved
and any changes more recent than in the backing storage would be lost).
In retrospect this is a rare optimisation against memory pressure,
already the slow path. If we always mark the buffer as dirty when
accessed by the GPU, anything not used can still be evicted cheaply
(ideal behaviour for mark-and-sweep eviction) but we do not run the risk
of corruption. For correct read serialisation, userspace still has to
notify when the GPU writes to an object. However, there are certain
situations under which userspace may wish to tell white lies to the
kernel...

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Cc: Kristian Høgsberg <krh at bitplanet.net>
Cc: Jesse Barnes <jbarnes at virtuousgeek.org>
Cc: "Goel, Akash" <akash.goel at intel.co>
Cc: Michał Winiarski <michal.winiarski at intel.com>
Cc: stable at vger.kernel.org
---
 drivers/gpu/drm/i915/i915_gem_execbuffer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 923a3c4bf0b7..a953d4975b8c 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1032,6 +1032,7 @@ i915_gem_execbuffer_move_to_active(struct list_head *vmas,
 		u32 old_read = obj->base.read_domains;
 		u32 old_write = obj->base.write_domain;
 
+		obj->dirty = 1; /* be paranoid  */
 		obj->base.write_domain = obj->base.pending_write_domain;
 		if (obj->base.write_domain == 0)
 			obj->base.pending_read_domains |= obj->base.read_domains;
@@ -1039,7 +1040,6 @@ i915_gem_execbuffer_move_to_active(struct list_head *vmas,
 
 		i915_vma_move_to_active(vma, req);
 		if (obj->base.write_domain) {
-			obj->dirty = 1;
 			i915_gem_request_assign(&obj->last_write_req, req);
 
 			intel_fb_obj_invalidate(obj, ORIGIN_CS);
-- 
2.5.1