[PATCH 13/64] drm/i915: Reject more ioctls for userptr

[Maarten Lankhorst]

There are a couple of ioctl's related to tiling and cache placement,
that make no sense for userptr, reject those:
- i915_gem_set_tiling_ioctl()
    Tiling should always be linear for userptr. Changing placement will
    fail with -ENXIO.
- i915_gem_set_caching_ioctl()
    Userptr memory should always be cached. Changing will fail with
    -ENXIO.
- i915_gem_set_domain_ioctl()
    Changed to be equivalent to gem_wait, which is correct for the
    cached linear userptr pointers. This is required because we
    cannot grab a reference to the pages in the rework, but waiting
    for idle will do the same.

This plus the previous changes have been tested against beignet
by using its own unit tests, and intel-video-compute by using
piglit's opencl tests.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>

-- Still needs an ack from relevant userspace that it won't break, but should be good.
---
 drivers/gpu/drm/i915/display/intel_display.c | 2 +-
 drivers/gpu/drm/i915/gem/i915_gem_domain.c   | 4 +++-
 drivers/gpu/drm/i915/gem/i915_gem_object.h   | 6 ++++++
 drivers/gpu/drm/i915/gem/i915_gem_userptr.c  | 3 ++-
 4 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index f2c48e5cdb43..66497e1571a0 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -16379,7 +16379,7 @@ static int intel_user_framebuffer_create_handle(struct drm_framebuffer *fb,
 	struct drm_i915_gem_object *obj = intel_fb_obj(fb);
 	struct drm_i915_private *i915 = to_i915(obj->base.dev);
 
-	if (obj->userptr.mm) {
+	if (i915_gem_object_is_userptr(obj)) {
 		drm_dbg(&i915->drm,
 			"attempting to use a userptr for a framebuffer, denied\n");
 		return -EINVAL;
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_domain.c b/drivers/gpu/drm/i915/gem/i915_gem_domain.c
index fcce6909f201..c1d4bf62b3ea 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_domain.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_domain.c
@@ -528,7 +528,9 @@ i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
 	 * considered to be outside of any cache domain.
 	 */
 	if (i915_gem_object_is_proxy(obj)) {
-		err = -ENXIO;
+		/* silently allow userptr to complete */
+		if (!i915_gem_object_is_userptr(obj))
+			err = -ENXIO;
 		goto out;
 	}
 
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h
index fa699d45e5a9..2ba6d114182c 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h
@@ -534,6 +534,12 @@ void __i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
 void __i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
 					      enum fb_op_origin origin);
 
+static inline bool
+i915_gem_object_is_userptr(struct drm_i915_gem_object *obj)
+{
+	return obj->userptr.mm;
+}
+
 static inline void
 i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
 				  enum fb_op_origin origin)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
index 44af6265948d..64a946d5f753 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
@@ -721,7 +721,8 @@ static const struct drm_i915_gem_object_ops i915_gem_userptr_ops = {
 	.name = "i915_gem_object_userptr",
 	.flags = I915_GEM_OBJECT_IS_SHRINKABLE |
 		 I915_GEM_OBJECT_NO_MMAP |
-		 I915_GEM_OBJECT_ASYNC_CANCEL,
+		 I915_GEM_OBJECT_ASYNC_CANCEL |
+		 I915_GEM_OBJECT_IS_PROXY,
 	.get_pages = i915_gem_userptr_get_pages,
 	.put_pages = i915_gem_userptr_put_pages,
 	.dmabuf_export = i915_gem_userptr_dmabuf_export,
-- 
2.30.0.rc1