drm/i915: Fix a use after free, and unbalanced refcounting

When converting from implicitly tracked execlist queue items to ref counted
requests, not all frees of requests were replaced with unrefs, and extraneous
refs/unrefs of contexts were added.
Correct the unbalanced refcount & replace the frees.
Remove a noisy warning when hitting the request creation path.

drm_i915_gem_request and intel_context are both kref reference counted
structures. Upon allocation, drm_i915_gem_request's ref count should be
bumped using kref_init. When a context is assigned to the request,
the context's reference count should be bumped using i915_gem_context_reference.
i915_gem_request_reference will reduce the context reference count when
the request is freed.

Problem introduced in
commit 6d3d8274bc45de4babb62d64562d92af984dd238
Author:     Nick Hoath <nicholas.hoath@intel.com>
AuthorDate: Thu Jan 15 13:10:39 2015 +0000

     drm/i915: Subsume intel_ctx_submit_request in to drm_i915_gem_request

v2: Added comments explaining how the ctx pointer and the request object should
be ref-counted. Removed noisy warning.

v3: Cleaned up the language used in the commit & the header
description (Thanks David Gordon)

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=88652
Signed-off-by: Nick Hoath <nicholas.hoath@intel.com>
Reviewed-by: Thomas Daniel <thomas.daniel@intel.com>
Reviewed-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index b38c770..8727086 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2114,6 +2114,9 @@ void i915_gem_track_fb(struct drm_i915_gem_object *old,
  * number comparisons on buffer last_read|write_seqno. It also allows an
  * emission time to be associated with the request for tracking how far ahead
  * of the GPU the submission is.
+ *
+ * The requests are reference counted, so upon creation they should have an
+ * initial reference taken using kref_init
  */
 struct drm_i915_gem_request {
        struct kref ref;
@@ -2137,7 +2140,16 @@ struct drm_i915_gem_request {
        /** Position in the ringbuffer of the end of the whole request */
        u32 tail;
 
-       /** Context related to this request */
+       /**
+        * Context related to this request
+        * Contexts are refcounted, so when this request is associated with a
+        * context, we must increment the context's refcount, to guarantee that
+        * it persists while any request is linked to it. Requests themselves
+        * are also refcounted, so the request will only be freed when the last
+        * reference to it is dismissed, and the code in
+        * i915_gem_request_free() will then decrement the refcount on the
+        * context.
+        */
        struct intel_context *ctx;
 
        /** Batch buffer related to this request if any */

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index c26d36c..e5daad5 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2659,8 +2659,7 @@ static void i915_gem_reset_ring_cleanup(struct drm_i915_private *dev_priv,
                if (submit_req->ctx != ring->default_context)
                        intel_lr_context_unpin(ring, submit_req->ctx);
 
-               i915_gem_context_unreference(submit_req->ctx);
-               kfree(submit_req);
+               i915_gem_request_unreference(submit_req);
        }
 
        /*

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 0f358c5..e8d3da9 100644 (file)
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -503,18 +503,19 @@ static int execlists_context_queue(struct intel_engine_cs *ring,
                 * If there isn't a request associated with this submission,
                 * create one as a temporary holder.
                 */
-               WARN(1, "execlist context submission without request");
                request = kzalloc(sizeof(*request), GFP_KERNEL);
                if (request == NULL)
                        return -ENOMEM;
                request->ring = ring;
                request->ctx = to;
+               kref_init(&request->ref);
+               request->uniq = dev_priv->request_uniq++;
+               i915_gem_context_reference(request->ctx);
        } else {
+               i915_gem_request_reference(request);
                WARN_ON(to != request->ctx);
        }
        request->tail = tail;
-       i915_gem_request_reference(request);
-       i915_gem_context_reference(request->ctx);
 
        intel_runtime_pm_get(dev_priv);
 
@@ -731,7 +732,6 @@ void intel_execlists_retire_requests(struct intel_engine_cs *ring)
                if (ctx_obj && (ctx != ring->default_context))
                        intel_lr_context_unpin(ring, ctx);
                intel_runtime_pm_put(dev_priv);
-               i915_gem_context_unreference(ctx);
                list_del(&req->execlist_link);
                i915_gem_request_unreference(req);
        }