drm/i915: Skip switch-to-kernel-context on suspend when wedged

If the HW is already wedged, attempting to submit a request will
generate an -EIO. If we tried this during suspend, we would abort
whereas all we want to do is to go sleep and throw away the corrupt
state.

Fixes: 5ab57c702069 ("drm/i915: Flush logical context image out to memory upon suspend")
Testcase: igt/gem_eio/suspend
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171130102951.14965-1-chris@chris-wilson.co.uk
(cherry picked from commit ecf73eb2d27d43b2153bb80671768a06d35521f1)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

1 files changed, 11 insertions, 9 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 3a140eedfc83..46bdea2de268 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4712,17 +4712,19 @@ int i915_gem_suspend(struct drm_i915_private *dev_priv)
          * state. Fortunately, the kernel_context is disposable and we do
          * not rely on its state.
          */
-        ret = i915_gem_switch_to_kernel_context(dev_priv);
-        if (ret)
-                goto err_unlock;
+        if (!i915_terminally_wedged(&dev_priv->gpu_error)) {
+                ret = i915_gem_switch_to_kernel_context(dev_priv);
+                if (ret)
+                        goto err_unlock;
 
-        ret = i915_gem_wait_for_idle(dev_priv,
-                                     I915_WAIT_INTERRUPTIBLE |
-                                     I915_WAIT_LOCKED);
-        if (ret && ret != -EIO)
-                goto err_unlock;
+                ret = i915_gem_wait_for_idle(dev_priv,
+                                             I915_WAIT_INTERRUPTIBLE |
+                                             I915_WAIT_LOCKED);
+                if (ret && ret != -EIO)
+                        goto err_unlock;
 
-        assert_kernel_context_is_current(dev_priv);
+                assert_kernel_context_is_current(dev_priv);
+        }
         i915_gem_contexts_lost(dev_priv);
         mutex_unlock(&dev->struct_mutex);