drm/i915: Trim error mask to known engines

For the convenience of userspace passing in an arbitrary reset mask,
remove unknown engines from the set of engines that are to be reset.
This means that we always follow a per-engine reset with a full-device
reset when userspace writes -1 into debugfs/i915_wedged.

Reported-by: Michał Winiarski <michal.winiarski@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180316215001.12391-1-chris@chris-wilson.co.uk
Reviewed-by: Michel Thierry <michel.thierry@intel.com>

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 828f3104488c485fed5df3287bf2fd70620ca8f2..44eef355e12c148557e66deae9b0d25f7d80d117 100644 (file)
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2985,6 +2985,7 @@ void i915_handle_error(struct drm_i915_private *dev_priv,
         */
        intel_runtime_pm_get(dev_priv);
 
+       engine_mask &= INTEL_INFO(dev_priv)->ring_mask;
        i915_capture_error_state(dev_priv, engine_mask, error_msg);
        i915_clear_error_registers(dev_priv);