Daniel noticed a problem where is we wrote to an object with ring A in
the middle of a very long running batch, then executed a quick batch on
ring B before a batch that reads from the same object, its obj->ring would
now point to ring B, but its last_write_seqno would be still relative to
ring A. This would allow for the user to read from the object before the
GPU had completed the write, as set_domain would only check that ring B
had passed the last_write_seqno.
To fix this simply (and inelegantly), we bump the last_write_seqno when
switching rings so that the last_write_seqno is always relative to the
current obj->ring.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
drivers/gpu/drm/i915/i915_gem.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 774620d..7c59cb1 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1954,6 +1954,10 @@ i915_gem_object_move_to_active(struct drm_i915_gem_object *obj,
u32 seqno = intel_ring_get_seqno(ring);
BUG_ON(ring == NULL);
+ if (obj->ring != ring && obj->last_write_seqno) {
+ /* Keep the seqno relative to the current ring */
+ obj->last_write_seqno = seqno;
+ }
obj->ring = ring;
/* Add a reference if we're newly entering the active list. */
--
1.8.3.2
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