drm/i915: Simplify testing for am-I-the-kernel-context?

The kernel context (dev_priv->kernel_context) is unique in that it is
not associated with any user filp - it is the only one with
ctx->file_priv == NULL. This is a simpler test than comparing it against
dev_priv->kernel_context which involves some pointer dancing.

In checking that this is true, we notice that the gvt context is
allocating itself a i915_hw_ppgtt it doesn't use and not flagging that
its file_priv should be invalid.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170106152013.24684-5-chris@chris-wilson.co.uk

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem_context.h b/drivers/gpu/drm/i915/i915_gem_context.h
index 89f6764fb338..0ac750b90f3d 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.h
+++ b/drivers/gpu/drm/i915/i915_gem_context.h
@@ -246,6 +246,11 @@ static inline bool i915_gem_context_is_default(const struct i915_gem_context *c)
 	return c->user_handle == DEFAULT_CONTEXT_HANDLE;
 }
 
+static inline bool i915_gem_context_is_kernel(struct i915_gem_context *ctx)
+{
+	return !ctx->file_priv;
+}
+
 /* i915_gem_context.c */
 int __must_check i915_gem_context_init(struct drm_i915_private *dev_priv);
 void i915_gem_context_lost(struct drm_i915_private *dev_priv);