From 05ba44b3704e2115251c340fc72db609a0b97f3b Mon Sep 17 00:00:00 2001 From: Rob Clark Date: Tue, 2 Aug 2022 08:51:36 -0700 Subject: [PATCH] drm/msm: Split out idr_lock Otherwise if we hit reclaim pinning objects in the submit path, we'll be blocking retire_worker trying to free a submit. Signed-off-by: Rob Clark Patchwork: https://patchwork.freedesktop.org/patch/496116/ Link: https://lore.kernel.org/r/20220802155152.1727594-4-robdclark@gmail.com --- drivers/gpu/drm/msm/msm_drv.c | 4 ++-- drivers/gpu/drm/msm/msm_gem_submit.c | 10 ++++++++-- drivers/gpu/drm/msm/msm_gpu.h | 4 +++- drivers/gpu/drm/msm/msm_submitqueue.c | 1 + 4 files changed, 14 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c index 1ed4cd0..d7ca025 100644 --- a/drivers/gpu/drm/msm/msm_drv.c +++ b/drivers/gpu/drm/msm/msm_drv.c @@ -883,13 +883,13 @@ static int wait_fence(struct msm_gpu_submitqueue *queue, uint32_t fence_id, * retired, so if the fence is not found it means there is nothing * to wait for */ - ret = mutex_lock_interruptible(&queue->lock); + ret = mutex_lock_interruptible(&queue->idr_lock); if (ret) return ret; fence = idr_find(&queue->fence_idr, fence_id); if (fence) fence = dma_fence_get_rcu(fence); - mutex_unlock(&queue->lock); + mutex_unlock(&queue->idr_lock); if (!fence) return 0; diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c index c781978..16c6628 100644 --- a/drivers/gpu/drm/msm/msm_gem_submit.c +++ b/drivers/gpu/drm/msm/msm_gem_submit.c @@ -72,9 +72,9 @@ void __msm_gem_submit_destroy(struct kref *kref) unsigned i; if (submit->fence_id) { - mutex_lock(&submit->queue->lock); + mutex_lock(&submit->queue->idr_lock); idr_remove(&submit->queue->fence_idr, submit->fence_id); - mutex_unlock(&submit->queue->lock); + mutex_unlock(&submit->queue->idr_lock); } dma_fence_put(submit->user_fence); @@ -881,6 +881,8 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data, submit->nr_cmds = i; + mutex_lock(&queue->idr_lock); + /* * If using userspace provided seqno fence, validate that the id * is available before arming sched job. Since access to fence_idr @@ -889,6 +891,7 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data, */ if ((args->flags & MSM_SUBMIT_FENCE_SN_IN) && idr_find(&queue->fence_idr, args->fence)) { + mutex_unlock(&queue->idr_lock); ret = -EINVAL; goto out; } @@ -921,6 +924,9 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data, submit->user_fence, 1, INT_MAX, GFP_KERNEL); } + + mutex_unlock(&queue->idr_lock); + if (submit->fence_id < 0) { ret = submit->fence_id; submit->fence_id = 0; diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h index 4d935fe..962d207 100644 --- a/drivers/gpu/drm/msm/msm_gpu.h +++ b/drivers/gpu/drm/msm/msm_gpu.h @@ -466,7 +466,8 @@ static inline int msm_gpu_convert_priority(struct msm_gpu *gpu, int prio, * @node: node in the context's list of submitqueues * @fence_idr: maps fence-id to dma_fence for userspace visible fence * seqno, protected by submitqueue lock - * @lock: submitqueue lock + * @idr_lock: for serializing access to fence_idr + * @lock: submitqueue lock for serializing submits on a queue * @ref: reference count * @entity: the submit job-queue */ @@ -479,6 +480,7 @@ struct msm_gpu_submitqueue { struct msm_file_private *ctx; struct list_head node; struct idr fence_idr; + struct mutex idr_lock; struct mutex lock; struct kref ref; struct drm_sched_entity *entity; diff --git a/drivers/gpu/drm/msm/msm_submitqueue.c b/drivers/gpu/drm/msm/msm_submitqueue.c index f486a3c..c6929e2 100644 --- a/drivers/gpu/drm/msm/msm_submitqueue.c +++ b/drivers/gpu/drm/msm/msm_submitqueue.c @@ -200,6 +200,7 @@ int msm_submitqueue_create(struct drm_device *drm, struct msm_file_private *ctx, *id = queue->id; idr_init(&queue->fence_idr); + mutex_init(&queue->idr_lock); mutex_init(&queue->lock); list_add_tail(&queue->node, &ctx->submitqueues); -- 2.7.4