drm/i915: Convert mmio_flip::seqno to struct request
Converted the mmio_flip 'seqno' value to be a request structure as part of the
on going seqno to request changes. This includes reference counting the request
being saved away to ensure it can not be retired and freed while the flip code
is still waiting on it.
v2: Used the IRQ friendly request dereference call in the notify handler as that
code is called asynchronously without holding any useful mutex locks.
For: VIZ-4377
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: Thomas Daniel <Thomas.Daniel@intel.com>
[danvet: Drop the _irq variant and use the normal reques unref,
wrapped in dev->struct_mutex per the discussion on the m-l.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 3085731..61c4024 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -9612,20 +9612,24 @@
static void intel_mmio_flip_work_func(struct work_struct *work)
{
- struct intel_crtc *intel_crtc =
+ struct intel_crtc *crtc =
container_of(work, struct intel_crtc, mmio_flip.work);
- struct intel_engine_cs *ring;
- uint32_t seqno;
+ struct intel_mmio_flip *mmio_flip;
- seqno = intel_crtc->mmio_flip.seqno;
- ring = intel_crtc->mmio_flip.ring;
-
- if (seqno)
- WARN_ON(__i915_wait_seqno(ring, seqno,
- intel_crtc->reset_counter,
+ mmio_flip = &crtc->mmio_flip;
+ if (mmio_flip->req)
+ WARN_ON(__i915_wait_seqno(i915_gem_request_get_ring(mmio_flip->req),
+ i915_gem_request_get_seqno(mmio_flip->req),
+ crtc->reset_counter,
false, NULL, NULL) != 0);
- intel_do_mmio_flip(intel_crtc);
+ intel_do_mmio_flip(crtc);
+ if (mmio_flip->req) {
+ mutex_lock(&crtc->base.dev->struct_mutex);
+ i915_gem_request_unreference(mmio_flip->req);
+ mutex_unlock(&crtc->base.dev->struct_mutex);
+ }
+ mmio_flip->req = NULL;
}
static int intel_queue_mmio_flip(struct drm_device *dev,
@@ -9637,9 +9641,8 @@
{
struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
- intel_crtc->mmio_flip.seqno =
- i915_gem_request_get_seqno(obj->last_write_req);
- intel_crtc->mmio_flip.ring = obj->ring;
+ i915_gem_request_assign(&intel_crtc->mmio_flip.req,
+ obj->last_write_req);
schedule_work(&intel_crtc->mmio_flip.work);