From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
If we make GEM contexts keep a reference to i915_drm_client for the whole
of their lifetime, we can consolidate the current task pid and name usage
by getting it from the client.
v2: Don't bother supporting selftests contexts from debugfs. (Chris)
v3 (Lucas): Finish constructing ctx before adding it to the list
v4 (Ram): Rebase.
v5: Trivial rebase for proto ctx changes.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Aravind Iddamsetty <aravind.iddamsetty@xxxxxxxxx>
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/gem/i915_gem_context.c | 13 +++++++----
.../gpu/drm/i915/gem/i915_gem_context_types.h | 13 +++--------
drivers/gpu/drm/i915/i915_gpu_error.c | 22 +++++++++++--------
3 files changed, 25 insertions(+), 23 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index ae9d4e087a92..5a38cb163f04 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -989,10 +989,11 @@ void i915_gem_context_release(struct kref *ref)
trace_i915_context_free(ctx);
GEM_BUG_ON(!i915_gem_context_is_closed(ctx));
+ if (ctx->client)
+ i915_drm_client_put(ctx->client);
+
mutex_destroy(&ctx->engines_mutex);
mutex_destroy(&ctx->lut_mutex);
-
- put_pid(ctx->pid);
mutex_destroy(&ctx->mutex);
kfree_rcu(ctx, rcu);
@@ -1436,9 +1437,13 @@ static void gem_context_register(struct i915_gem_context *ctx,
ctx->file_priv = fpriv;
- ctx->pid = get_task_pid(current, PIDTYPE_PID);
+ ctx->client = i915_drm_client_get(fpriv->client);
+
+ rcu_read_lock();
snprintf(ctx->name, sizeof(ctx->name), "%s[%d]",
- current->comm, pid_nr(ctx->pid));
+ i915_drm_client_name(ctx->client),
+ pid_nr(i915_drm_client_pid(ctx->client)));
+ rcu_read_unlock();
/* And finally expose ourselves to userspace via the idr */
old = xa_store(&fpriv->context_xa, id, ctx, GFP_KERNEL);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
index 94c03a97cb77..d28678385d16 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
@@ -264,19 +264,12 @@ struct i915_gem_context {
*/
struct i915_address_space __rcu *vm;
- /**
- * @pid: process id of creator
- *
- * Note that who created the context may not be the principle user,
- * as the context may be shared across a local socket. However,
- * that should only affect the default context, all contexts created
- * explicitly by the client are expected to be isolated.
- */
- struct pid *pid;
-
/** @link: place with &drm_i915_private.context_list */
struct list_head link;
+ /** @client: struct i915_drm_client */
+ struct i915_drm_client *client;
+
/**
* @ref: reference count
*
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index a2c58b54a592..b1f17477d0cb 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -1235,7 +1235,9 @@ static void record_request(const struct i915_request *request,
ctx = rcu_dereference(request->context->gem_context);
if (ctx)
- erq->pid = pid_nr(ctx->pid);
+ erq->pid = I915_SELFTEST_ONLY(!ctx->client) ?
+ 0 :
+ pid_nr(i915_drm_client_pid(ctx->client));
}
rcu_read_unlock();
}
@@ -1256,23 +1258,25 @@ static bool record_context(struct i915_gem_context_coredump *e,
const struct i915_request *rq)
{
struct i915_gem_context *ctx;
- struct task_struct *task;
bool simulated;
rcu_read_lock();
+
ctx = rcu_dereference(rq->context->gem_context);
if (ctx && !kref_get_unless_zero(&ctx->ref))
ctx = NULL;
- rcu_read_unlock();
- if (!ctx)
+ if (!ctx) {
+ rcu_read_unlock();
return true;
+ }
- rcu_read_lock();
- task = pid_task(ctx->pid, PIDTYPE_PID);
- if (task) {
- strcpy(e->comm, task->comm);
- e->pid = task->pid;
+ if (I915_SELFTEST_ONLY(!ctx->client)) {
+ strcpy(e->comm, "[kernel]");
+ } else {
+ strcpy(e->comm, i915_drm_client_name(ctx->client));
+ e->pid = pid_nr(i915_drm_client_pid(ctx->client));
}
+
rcu_read_unlock();
e->sched_attr = ctx->sched;
--
2.30.2
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