[Intel-gfx] [PATCH 12/18] drm/i915: try to reset the gpu before unload

[Ben Widawsky]

paranoia

For context support the HW expects the default context to always be
available as there is no way to shut off HW contexts once turned on
(afaics). This is problematic when unloading the driver as we have no
way to prevent the GPU from expecting the BO to still be present once
unloaded.

The best we can do to remedy the situation is to attempt a GPU reset
when doing the unload.

NOTE: this patch isn't *really* required to go with the rest of the
context serious.

Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_gem.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index c1aab45..848cc45 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3910,6 +3910,9 @@ i915_gem_lastclose(struct drm_device *dev)
 	ret = i915_gem_idle(dev);
 	if (ret)
 		DRM_ERROR("failed to idle hardware: %d\n", ret);
+	ret = i915_reset(dev, GRDOM_FULL);
+	if (ret)
+		DRM_ERROR("failed to reset gpu: %d\n", ret);
 }
 
 static void
-- 
1.7.9.4