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

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: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180726085033.4044-2-chris@chris-wilson.co.uk
Reviewed-by: Michał Winiarski <michal.winiarski@intel.com>
This commit is contained in:
Chris Wilson 2018-07-26 09:50:32 +01:00
parent 52dda80d62
commit 7ed43df720
1 changed files with 10 additions and 1 deletions
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11
drivers/gpu/drm/i915/i915_gem.c
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@ -5598,6 +5598,8 @@ err_uc_misc:
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,
@ -5608,7 +5610,14 @@ err_uc_misc:
"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);