drm/i915: Add process identifier to requests

We use the pid of the process which opened our device when
we track which was the culprit of the gpu hang. But as that
file descriptor might get inherited, we might blame the
wrong process when we record the error state.

Track process identifiers in requests to always find
the correct offender.

v2: Track only user processes (Chris)

Cc: Kenneth Graunke <kenneth@whitecape.org>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
[danvet: drop NULL check before put_pid as suggested by Chris.]
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

3 files changed, 9 insertions, 3 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index b37604bbdf1a..5d8cb458f4f5 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2160,6 +2160,9 @@ struct drm_i915_gem_request {
         /** file_priv list entry for this request */
         struct list_head client_list;
 
+        /** process identifier submitting this request */
+        struct pid *pid;
+
         uint32_t uniq;
 
         /**
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 323706cefedf..f28f0dea6c96 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2493,6 +2493,8 @@ int __i915_add_request(struct intel_engine_cs *ring,
                 list_add_tail(&request->client_list,
                               &file_priv->mm.request_list);
                 spin_unlock(&file_priv->mm.lock);
+
+                request->pid = get_pid(task_pid(current));
         }
 
         trace_i915_gem_request_add(request);
@@ -2573,6 +2575,8 @@ static void i915_gem_free_request(struct drm_i915_gem_request *request)
         list_del(&request->list);
         i915_gem_request_remove_from_client(request);
 
+        put_pid(request->pid);
+
         i915_gem_request_unreference(request);
 }
 
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 48ddbf44c862..a982849a5edd 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -994,12 +994,11 @@ static void i915_gem_record_rings(struct drm_device *dev,
                                         i915_error_ggtt_object_create(dev_priv,
                                                              ring->scratch.obj);
 
-                        if (request->file_priv) {
+                        if (request->pid) {
                                 struct task_struct *task;
 
                                 rcu_read_lock();
-                                task = pid_task(request->file_priv->file->pid,
-                                                PIDTYPE_PID);
+                                task = pid_task(request->pid, PIDTYPE_PID);
                                 if (task) {
                                         strcpy(error->ring[i].comm, task->comm);
                                         error->ring[i].pid = task->pid;