[PATCH 10/11] drm/msm: Drop struct_mutex in submit path

Rob Clark
2021-07-17T20:26:06Z

It is sufficient to serialize on the submit queue now.

Signed-off-by: Rob Clark <robdclark@chromium.org>
---
drivers/gpu/drm/msm/msm_gem_submit.c | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c
index 66316ea47c18..73bdea43e1ab 100644
--- a/drivers/gpu/drm/msm/msm_gem_submit.c
+++ b/drivers/gpu/drm/msm/msm_gem_submit.c
@@ -711,7 +711,7 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
struct msm_drm_private *priv = dev->dev_private;
struct drm_msm_gem_submit *args = data;
struct msm_file_private *ctx = file->driver_priv;
- struct msm_gem_submit *submit;
+ struct msm_gem_submit *submit = NULL;
struct msm_gpu *gpu = priv->gpu;
struct msm_gpu_submitqueue *queue;
struct msm_ringbuffer *ring;
@@ -755,7 +755,7 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
trace_msm_gpu_submit(pid_nr(pid), ring->id, submitid,
args->nr_bos, args->nr_cmds);

- ret = mutex_lock_interruptible(&dev->struct_mutex);
+ ret = mutex_lock_interruptible(&queue->lock);
if (ret)
goto out_post_unlock;

@@ -876,10 +876,8 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
* Allocate an id which can be used by WAIT_FENCE ioctl to map back
* to the underlying fence.
*/
- mutex_lock(&queue->lock);
submit->fence_id = idr_alloc_cyclic(&queue->fence_idr,
submit->fence, 0, INT_MAX, GFP_KERNEL);
- mutex_unlock(&queue->lock);
if (submit->fence_id < 0) {
ret = submit->fence_id = 0;
submit->fence_id = 0;
@@ -914,12 +912,12 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
submit_cleanup(submit, !!ret);
if (has_ww_ticket)
ww_acquire_fini(&submit->ticket);
- msm_gem_submit_put(submit);
out_unlock:
if (ret && (out_fence_fd >= 0))
put_unused_fd(out_fence_fd);
- mutex_unlock(&dev->struct_mutex);
-
+ mutex_unlock(&queue->lock);
+ if (submit)
+ msm_gem_submit_put(submit);
out_post_unlock:
if (!IS_ERR_OR_NULL(post_deps)) {
for (i = 0; i < args->nr_out_syncobjs; ++i) {
--
2.31.1