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drm/v3d: Take a lock across GPU scheduler job creation and queuing.

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Between creation and queueing of a job, you need to prevent any other
job from being created and queued.  Otherwise the scheduler's fences
may be signaled out of seqno order.

v2: move mutex unlock to the error label.

Signed-off-by: Eric Anholt <eric@anholt.net>
Fixes: 57692c94dc ("drm/v3d: Introduce a new DRM driver for Broadcom V3D V3.x+")
Link: https://patchwork.freedesktop.org/patch/msgid/20180606174851.12433-1-eric@anholt.net
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
This commit is contained in:
Eric Anholt 2018-06-06 10:48:51 -07:00
parent 6aa13402c1
commit 7122b68b8a
2 changed files with 9 additions and 0 deletions
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5
drivers/gpu/drm/v3d/v3d_drv.h
View File

@ -85,6 +85,11 @@ struct v3d_dev {
*/
struct mutex reset_lock;
/* Lock taken when creating and pushing the GPU scheduler
* jobs, to keep the sched-fence seqnos in order.
*/
struct mutex sched_lock;
struct {
u32 num_allocated;
u32 pages_allocated;

4
drivers/gpu/drm/v3d/v3d_gem.c
View File

@ -550,6 +550,7 @@ v3d_submit_cl_ioctl(struct drm_device *dev, void *data,
if (ret)
goto fail;
mutex_lock(&v3d->sched_lock);
if (exec->bin.start != exec->bin.end) {
ret = drm_sched_job_init(&exec->bin.base,
&v3d->queue[V3D_BIN].sched,
@ -576,6 +577,7 @@ v3d_submit_cl_ioctl(struct drm_device *dev, void *data,
kref_get(&exec->refcount); /* put by scheduler job completion */
drm_sched_entity_push_job(&exec->render.base,
&v3d_priv->sched_entity[V3D_RENDER]);
mutex_unlock(&v3d->sched_lock);
v3d_attach_object_fences(exec);
@ -594,6 +596,7 @@ v3d_submit_cl_ioctl(struct drm_device *dev, void *data,
return 0;
fail_unreserve:
mutex_unlock(&v3d->sched_lock);
v3d_unlock_bo_reservations(dev, exec, &acquire_ctx);
fail:
v3d_exec_put(exec);
@ -615,6 +618,7 @@ v3d_gem_init(struct drm_device *dev)
spin_lock_init(&v3d->job_lock);
mutex_init(&v3d->bo_lock);
mutex_init(&v3d->reset_lock);
mutex_init(&v3d->sched_lock);
/* Note: We don't allocate address 0. Various bits of HW
* treat 0 as special, such as the occlusion query counters