Lionel Landwerlin
d2ff2b9e4a
We need to guarantee that when vkQueueSubmit() returns the application
can actually wait on a signaled semaphore/syncobj.
When using a thread to do the submission to i915, this gets a bit
tricky in the following case :
A syncobj is used both as a wait & signal semaphore and has been
signaled once already. It contains a fence before entering
vkQueueSubmit().
This means we need to reset the syncobj to ensure when we return
from vkQueueSubmit(), the syncobj contains no stale fence.
Currently in the Anv, the submission thread is in charge of putting
the new fence in the syncobj and also picks up the wait fence
directly from the syncobj. This means we can't reset the syncobj
from vkQueueSubmit().
The solution to this has been pointed by Bas & Jason :
In vkQueueSubmit(), clone the wait syncobj fence into a new
temporary syncobj that will be destroy after submission and use
this temporary syncobj as a wait fence for i915. This allows us to
reset the original syncobj in vkQueueSubmit().
For this to work with wait_before_signal behavior, we also need to
do a wait-on-materialize on binary semaphores from vkQueueSubmit().
Otherwise the application thread calling vkQueueSubmit() could race
the submission thread and pick up the wrong fence when cloing.
v2: Use copy semantic for clone_syncobj_dma_fence() (Jason)
Do the cloning prior to adding the syncobj to anv_queue_submit so
that if the cloning fails don't have an invalid syncobj in
anv_queue_submit (Jason)
v3: Fix another syncobj leak (Jason)
v4: Fix invalid argument order (Lionel)
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: mesa-stable
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/4945
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11474>
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