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
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 07ac811..40a6939 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -413,14 +413,17 @@ i915_gem_context_create_gvt(struct drm_device *dev)
if (ret)
return ERR_PTR(ret);
- ctx = i915_gem_create_context(to_i915(dev), NULL);
+ ctx = __create_hw_context(to_i915(dev), NULL);
if (IS_ERR(ctx))
goto out;
+ ctx->file_priv = ERR_PTR(-EBADF);
i915_gem_context_set_closed(ctx); /* not user accessible */
i915_gem_context_clear_bannable(ctx);
i915_gem_context_set_force_single_submission(ctx);
ctx->ring_size = 512 * PAGE_SIZE; /* Max ring buffer size */
+
+ GEM_BUG_ON(i915_gem_context_is_kernel(ctx));
out:
mutex_unlock(&dev->struct_mutex);
return ctx;
@@ -472,6 +475,8 @@ int i915_gem_context_init(struct drm_i915_private *dev_priv)
ctx->priority = I915_PRIORITY_MIN; /* lowest priority; idle task */
dev_priv->kernel_context = ctx;
+ GEM_BUG_ON(!i915_gem_context_is_kernel(ctx));
+
DRM_DEBUG_DRIVER("%s context support initialized\n",
i915.enable_execlists ? "LR" :
dev_priv->hw_context_size ? "HW" : "fake");
@@ -524,6 +529,8 @@ void i915_gem_context_fini(struct drm_i915_private *dev_priv)
lockdep_assert_held(&dev_priv->drm.struct_mutex);
+ GEM_BUG_ON(!i915_gem_context_is_kernel(dctx));
+
context_close(dctx);
dev_priv->kernel_context = NULL;
@@ -549,6 +556,8 @@ int i915_gem_context_open(struct drm_device *dev, struct drm_file *file)
ctx = i915_gem_create_context(to_i915(dev), file_priv);
mutex_unlock(&dev->struct_mutex);
+ GEM_BUG_ON(i915_gem_context_is_kernel(ctx));
+
if (IS_ERR(ctx)) {
idr_destroy(&file_priv->context_idr);
return PTR_ERR(ctx);
@@ -968,6 +977,8 @@ int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
if (IS_ERR(ctx))
return PTR_ERR(ctx);
+ GEM_BUG_ON(i915_gem_context_is_kernel(ctx));
+
args->ctx_id = ctx->user_handle;
DRM_DEBUG("HW context %d created\n", args->ctx_id);