This is a note to let you know that I've just added the patch titled
drm/xe: Use bookkeep slots for external BO's in exec IOCTL
to the 6.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-xe-use-bookkeep-slots-for-external-bo-s-in-exec-.patch
and it can be found in the queue-6.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit dd381de616b766734959487cd2bcef69663e6e78
Author: Matthew Brost <matthew.brost@xxxxxxxxx>
Date: Wed Sep 11 08:26:22 2024 -0700
drm/xe: Use bookkeep slots for external BO's in exec IOCTL
[ Upstream commit e7518276e9388d36f103e8c1c7e99898a30d11f5 ]
Fix external BO's dma-resv usage in exec IOCTL using bookkeep slots
rather than write slots. This leaves syncing to user space rather than
the KMD blindly enforcing write semantics on every external BO.
Fixes: dd08ebf6c352 ("drm/xe: Introduce a new DRM driver for Intel GPUs")
Cc: José Roberto de Souza <jose.souza@xxxxxxxxx>
Cc: Kenneth Graunke <kenneth.w.graunke@xxxxxxxxx>
Cc: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
Reported-by: Simona Vetter <simona.vetter@xxxxxxxx>
Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2673
Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>
Reviewed-by: José Roberto de Souza <jose.souza@xxxxxxxxx>
Reviewed-by: Kenneth Graunke <kenneth@xxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20240911152622.903058-1-matthew.brost@xxxxxxxxx
(cherry picked from commit b8b1163248759ba18509f7443a2d19b15b4c1df8)
Signed-off-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/xe/xe_exec.c b/drivers/gpu/drm/xe/xe_exec.c
index f36980aa26e69..6e5ba381eaded 100644
--- a/drivers/gpu/drm/xe/xe_exec.c
+++ b/drivers/gpu/drm/xe/xe_exec.c
@@ -40,11 +40,6 @@
* user knows an exec writes to a BO and reads from the BO in the next exec, it
* is the user's responsibility to pass in / out fence between the two execs).
*
- * Implicit dependencies for external BOs are handled by using the dma-buf
- * implicit dependency uAPI (TODO: add link). To make this works each exec must
- * install the job's fence into the DMA_RESV_USAGE_WRITE slot of every external
- * BO mapped in the VM.
- *
* We do not allow a user to trigger a bind at exec time rather we have a VM
* bind IOCTL which uses the same in / out fence interface as exec. In that
* sense, a VM bind is basically the same operation as an exec from the user
@@ -58,8 +53,8 @@
* behind any pending kernel operations on any external BOs in VM or any BOs
* private to the VM. This is accomplished by the rebinds waiting on BOs
* DMA_RESV_USAGE_KERNEL slot (kernel ops) and kernel ops waiting on all BOs
- * slots (inflight execs are in the DMA_RESV_USAGE_BOOKING for private BOs and
- * in DMA_RESV_USAGE_WRITE for external BOs).
+ * slots (inflight execs are in the DMA_RESV_USAGE_BOOKKEEP for private BOs and
+ * for external BOs).
*
* Rebinds / dma-resv usage applies to non-compute mode VMs only as for compute
* mode VMs we use preempt fences and a rebind worker (TODO: add link).
@@ -292,7 +287,8 @@ int xe_exec_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
xe_sched_job_arm(job);
if (!xe_vm_in_lr_mode(vm))
drm_gpuvm_resv_add_fence(&vm->gpuvm, exec, &job->drm.s_fence->finished,
- DMA_RESV_USAGE_BOOKKEEP, DMA_RESV_USAGE_WRITE);
+ DMA_RESV_USAGE_BOOKKEEP,
+ DMA_RESV_USAGE_BOOKKEEP);
for (i = 0; i < num_syncs; i++) {
xe_sync_entry_signal(&syncs[i], &job->drm.s_fence->finished);
