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drm/i915: Perform GGTT restore much earlier during resume 

As soon as we re-enable the various functions within the HW, they may go
off and read data via a GGTT offset. Hence, if we have not yet restored
the GGTT PTE before then, they may read and even *write* random locations
in memory.

Detected by DMAR faults during resume.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Martin Peres <martin.peres@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: stable@vger.kernel.org
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190909110011.8958-4-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-09-09 12:00:08 +01:00
parent 0efa99dd58
commit cec5ca08e3
3 changed files with 11 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/i915/gem/i915_gem_pm.c
View File

@ -242,9 +242,6 @@ void i915_gem_resume(struct drm_i915_private *i915)
mutex_lock(&i915->drm.struct_mutex);
intel_uncore_forcewake_get(&i915->uncore, FORCEWAKE_ALL);
i915_gem_restore_gtt_mappings(i915);
i915_gem_restore_fences(i915);
if (i915_gem_init_hw(i915))
goto err_wedged;

5
drivers/gpu/drm/i915/i915_drv.c
View File

@ -1914,6 +1914,11 @@ static int i915_drm_resume(struct drm_device *dev)
if (ret)
DRM_ERROR("failed to re-enable GGTT\n");
mutex_lock(&dev_priv->drm.struct_mutex);
i915_gem_restore_gtt_mappings(dev_priv);
i915_gem_restore_fences(dev_priv);
mutex_unlock(&dev_priv->drm.struct_mutex);
intel_csr_ucode_resume(dev_priv);
i915_restore_state(dev_priv);

6
drivers/gpu/drm/i915/selftests/i915_gem.c
View File

@ -118,6 +118,12 @@ static void pm_resume(struct drm_i915_private *i915)
with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
intel_gt_sanitize(&i915->gt, false);
i915_gem_sanitize(i915);
mutex_lock(&i915->drm.struct_mutex);
i915_gem_restore_gtt_mappings(i915);
i915_gem_restore_fences(i915);
mutex_unlock(&i915->drm.struct_mutex);
i915_gem_resume(i915);
}
}