drm/i915: Perform pageflip using mmio if the GPU is terminally wedged

After a hang and failed reset, we cannot use the GPU to execute the page
flip instructions. Instead we can force a synchronous mmio flip. (Later,
we can reduce the synchronicity of the mmio flip by moving some of the
delays off to a worker, like the current page flip code; see vblank
tasks.)

References: https://bugs.freedesktop.org/show_bug.cgi?id=72631
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
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 680f4c7..45bd176 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -8653,6 +8653,9 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
             fb->pitches[0] != crtc->fb->pitches[0]))
                return -EINVAL;
 
+       if (i915_terminally_wedged(&dev_priv->gpu_error))
+               goto out_hang;
+
        work = kzalloc(sizeof(*work), GFP_KERNEL);
        if (work == NULL)
                return -ENOMEM;
@@ -8727,6 +8730,13 @@ cleanup:
 free_work:
        kfree(work);
 
+       if (ret == -EIO) {
+out_hang:
+               intel_crtc_wait_for_pending_flips(crtc);
+               ret = intel_pipe_set_base(crtc, crtc->x, crtc->y, fb);
+               if (ret == 0 && event)
+                       drm_send_vblank_event(dev, intel_crtc->pipe, event);
+       }
        return ret;
 }