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drm/msm: print offender task name on hangcheck recovery

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Track the pid per submit, so we can print the name of the task which
submitted the batch that caused the gpu to hang.

Signed-off-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Rob Clark 2016-05-03 10:10:15 -04:00
parent 40e6815bba
commit 4816b6267c
3 changed files with 22 additions and 4 deletions
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1
drivers/gpu/drm/msm/msm_gem.h
View file

@ -86,6 +86,7 @@ struct msm_gem_submit {
struct list_head bo_list;
struct ww_acquire_ctx ticket;
struct fence *fence;
struct pid *pid; /* submitting process */
bool valid; /* true if no cmdstream patching needed */
unsigned int nr_cmds;
unsigned int nr_bos;

2
drivers/gpu/drm/msm/msm_gem_submit.c
View file

@ -45,6 +45,7 @@ static struct msm_gem_submit *submit_create(struct drm_device *dev,
submit->dev = dev;
submit->gpu = gpu;
submit->pid = get_pid(task_pid(current));
/* initially, until copy_from_user() and bo lookup succeeds: */
submit->nr_bos = 0;
@ -60,6 +61,7 @@ void msm_gem_submit_free(struct msm_gem_submit *submit)
{
fence_put(submit->fence);
list_del(&submit->node);
put_pid(submit->pid);
kfree(submit);
}

23
drivers/gpu/drm/msm/msm_gpu.c
View file

@ -272,16 +272,30 @@ static void recover_worker(struct work_struct *work)
{
struct msm_gpu *gpu = container_of(work, struct msm_gpu, recover_work);
struct drm_device *dev = gpu->dev;
struct msm_gem_submit *submit;
uint32_t fence = gpu->funcs->last_fence(gpu);
dev_err(dev->dev, "%s: hangcheck recover!\n", gpu->name);
msm_update_fence(gpu->fctx, fence + 1);
mutex_lock(&dev->struct_mutex);
if (msm_gpu_active(gpu)) {
struct msm_gem_submit *submit;
dev_err(dev->dev, "%s: hangcheck recover!\n", gpu->name);
list_for_each_entry(submit, &gpu->submit_list, node) {
if (submit->fence->seqno == (fence + 1)) {
struct task_struct *task;
rcu_read_lock();
task = pid_task(submit->pid, PIDTYPE_PID);
if (task) {
dev_err(dev->dev, "%s: offending task: %s\n",
gpu->name, task->comm);
}
rcu_read_unlock();
break;
}
}
if (msm_gpu_active(gpu)) {
/* retire completed submits, plus the one that hung: */
retire_submits(gpu);
@ -293,6 +307,7 @@ static void recover_worker(struct work_struct *work)
gpu->funcs->submit(gpu, submit, NULL);
}
}
mutex_unlock(&dev->struct_mutex);
msm_gpu_retire(gpu);