Commit b185bde5 authored by Chris Wilson's avatar Chris Wilson Committed by Greg Kroah-Hartman

drm/i915: Restore sane defaults for KMS on GEM error load

[ Upstream commit 7ed43df7 ]

If we fail during GEM initialisation, we scrub the HW state by
performing a device level GPU resuet. However, we want to leave the
system in a usable state (with functioning KMS but no GEM) so after
scrubbing the HW state, we need to restore some sane defaults and
re-enable the low-level common parts of the GPU (such as the GMCH).

v2: Restore GTT entries.
Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180726085033.4044-2-chris@chris-wilson.co.ukReviewed-by: default avatarMichał Winiarski <michal.winiarski@intel.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent f9994851
......@@ -5595,6 +5595,8 @@ int i915_gem_init(struct drm_i915_private *dev_priv)
i915_gem_cleanup_userptr(dev_priv);
if (ret == -EIO) {
mutex_lock(&dev_priv->drm.struct_mutex);
/*
* Allow engine initialisation to fail by marking the GPU as
* wedged. But we only want to do this where the GPU is angry,
......@@ -5605,7 +5607,14 @@ int i915_gem_init(struct drm_i915_private *dev_priv)
"Failed to initialize GPU, declaring it wedged!\n");
i915_gem_set_wedged(dev_priv);
}
ret = 0;
/* Minimal basic recovery for KMS */
ret = i915_ggtt_enable_hw(dev_priv);
i915_gem_restore_gtt_mappings(dev_priv);
i915_gem_restore_fences(dev_priv);
intel_init_clock_gating(dev_priv);
mutex_unlock(&dev_priv->drm.struct_mutex);
}
i915_gem_drain_freed_objects(dev_priv);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment