[PATCH 4.18 103/228] drm/v3d: Take a lock across GPU scheduler job creation and queuing.

From: Greg Kroah-Hartman
Date: Tue Oct 02 2018 - 10:08:06 EST


4.18-stable review patch. If anyone has any objections, please let me know.

------------------

From: Eric Anholt <eric@xxxxxxxxxx>

[ Upstream commit 7122b68b8a9692dcc3acf89595f04c492872115f ]

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@xxxxxxxxxx>
Fixes: 57692c94dcbe ("drm/v3d: Introduce a new DRM driver for Broadcom V3D V3.x+")
Link: https://patchwork.freedesktop.org/patch/msgid/20180606174851.12433-1-eric@xxxxxxxxxx
Reviewed-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/v3d/v3d_drv.h | 5 +++++
drivers/gpu/drm/v3d/v3d_gem.c | 4 ++++
2 files changed, 9 insertions(+)

--- a/drivers/gpu/drm/v3d/v3d_drv.h
+++ b/drivers/gpu/drm/v3d/v3d_drv.h
@@ -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;
--- a/drivers/gpu/drm/v3d/v3d_gem.c
+++ b/drivers/gpu/drm/v3d/v3d_gem.c
@@ -550,6 +550,7 @@ v3d_submit_cl_ioctl(struct drm_device *d
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 *d
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 *d
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