drm/i915: Queue the idling context switch after all other timelines
Before suspend, we wait for the switch to the kernel context. In order
for all the other context images to be complete upon suspend, that
switch must be the last operation by the GPU (i.e. this idling request
must not overtake any pending requests). To make this request execute last,
we make it depend on every other inflight request.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161028125858.23563-24-chris@chris-wilson.co.uk
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 47e888c..a2acb8b 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -931,22 +931,33 @@ int i915_switch_context(struct drm_i915_gem_request *req)
int i915_gem_switch_to_kernel_context(struct drm_i915_private *dev_priv)
{
struct intel_engine_cs *engine;
+ struct i915_gem_timeline *timeline;
enum intel_engine_id id;
+ lockdep_assert_held(&dev_priv->drm.struct_mutex);
+
for_each_engine(engine, dev_priv, id) {
struct drm_i915_gem_request *req;
int ret;
- if (engine->last_context == NULL)
- continue;
-
- if (engine->last_context == dev_priv->kernel_context)
- continue;
-
req = i915_gem_request_alloc(engine, dev_priv->kernel_context);
if (IS_ERR(req))
return PTR_ERR(req);
+ /* Queue this switch after all other activity */
+ list_for_each_entry(timeline, &dev_priv->gt.timelines, link) {
+ struct drm_i915_gem_request *prev;
+ struct intel_timeline *tl;
+
+ tl = &timeline->engine[engine->id];
+ prev = i915_gem_active_raw(&tl->last_request,
+ &dev_priv->drm.struct_mutex);
+ if (prev)
+ i915_sw_fence_await_sw_fence_gfp(&req->submit,
+ &prev->submit,
+ GFP_KERNEL);
+ }
+
ret = i915_switch_context(req);
i915_add_request_no_flush(req);
if (ret)