[Intel-gfx] [PATCH 2/9] drm/i915: Prevent user context creation while wedged

[Chris Wilson]

Introduce a new ABI method for detecting a wedged driver by reporting
-EIO from DRM_IOCTL_I915_GEM_CONTEXT_CREATE.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_gem_context.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 102866967998..f6c48274fafb 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -797,18 +797,23 @@ static bool client_is_banned(struct drm_i915_file_private *file_priv)
 int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
 				  struct drm_file *file)
 {
-	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct drm_i915_private *i915 = to_i915(dev);
 	struct drm_i915_gem_context_create *args = data;
 	struct drm_i915_file_private *file_priv = file->driver_priv;
 	struct i915_gem_context *ctx;
 	int ret;
 
-	if (!DRIVER_CAPS(dev_priv)->has_logical_contexts)
+	if (!DRIVER_CAPS(i915)->has_logical_contexts)
 		return -ENODEV;
 
 	if (args->pad != 0)
 		return -EINVAL;
 
+	if (i915_terminally_wedged(&i915->gpu_error)) {
+		DRM_DEBUG("driver is wedged; banning new ctx!\n");
+		return -EIO;
+	}
+
 	if (client_is_banned(file_priv)) {
 		DRM_DEBUG("client %s[%d] banned from creating ctx\n",
 			  current->comm,
@@ -821,7 +826,7 @@ int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
 	if (ret)
 		return ret;
 
-	ctx = i915_gem_create_context(dev_priv, file_priv);
+	ctx = i915_gem_create_context(i915, file_priv);
 	mutex_unlock(&dev->struct_mutex);
 	if (IS_ERR(ctx))
 		return PTR_ERR(ctx);
-- 
2.20.1