[PATCH v12 6/6] drm/i915: Introduce GEM proxy

[Tina Zhang]

Signed-off-by: Tina Zhang <tina.zhang at intel.com>
---
 drivers/gpu/drm/i915/i915_gem.c        | 26 +++++++++++++++++++++++++-
 drivers/gpu/drm/i915/i915_gem_object.h |  9 +++++++++
 drivers/gpu/drm/i915/i915_gem_tiling.c |  5 +++++
 3 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 1b2dfa8..ebacc04 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1612,6 +1612,12 @@ i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
 	if (!obj)
 		return -ENOENT;
 
+	/* proxy gem object does not support setting domain */
+	if (i915_gem_object_is_proxy(obj)) {
+		err = -EPERM;
+		goto out;
+	}
+
 	/* Try to flush the object off the GPU without holding the lock.
 	 * We will repeat the flush holding the lock in the normal manner
 	 * to catch cases where we are gazumped.
@@ -1680,6 +1686,12 @@ i915_gem_sw_finish_ioctl(struct drm_device *dev, void *data,
 	if (!obj)
 		return -ENOENT;
 
+	/* proxy gem obj does not support this operation */
+	if (i915_gem_object_is_proxy(obj)) {
+		i915_gem_object_put(obj);
+		return -EPERM;
+	}
+
 	/* Pinned buffers may be scanout, so flush the cache */
 	i915_gem_object_flush_if_display(obj);
 	i915_gem_object_put(obj);
@@ -1730,7 +1742,7 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
 	 */
 	if (!obj->base.filp) {
 		i915_gem_object_put(obj);
-		return -EINVAL;
+		return -EPERM;
 	}
 
 	addr = vm_mmap(obj->base.filp, 0, args->size,
@@ -3764,6 +3776,12 @@ int i915_gem_set_caching_ioctl(struct drm_device *dev, void *data,
 	if (!obj)
 		return -ENOENT;
 
+	/* proxy gem obj does not support setting caching mode */
+	if (i915_gem_object_is_proxy(obj)) {
+		ret = -EPERM;
+		goto out;
+	}
+
 	if (obj->cache_level == level)
 		goto out;
 
@@ -4210,6 +4228,12 @@ i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
 	if (!obj)
 		return -ENOENT;
 
+	/* proxy gem obj does not support changing backding storage */
+	if (i915_gem_object_is_proxy(obj)) {
+		err = -EPERM;
+		goto out;
+	}
+
 	err = mutex_lock_interruptible(&obj->mm.lock);
 	if (err)
 		goto out;
diff --git a/drivers/gpu/drm/i915/i915_gem_object.h b/drivers/gpu/drm/i915/i915_gem_object.h
index 5b19a49..c91e336 100644
--- a/drivers/gpu/drm/i915/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/i915_gem_object.h
@@ -39,6 +39,7 @@ struct drm_i915_gem_object_ops {
 	unsigned int flags;
 #define I915_GEM_OBJECT_HAS_STRUCT_PAGE BIT(0)
 #define I915_GEM_OBJECT_IS_SHRINKABLE   BIT(1)
+#define I915_GEM_OBJECT_IS_PROXY	BIT(2)
 
 	/* Interface between the GEM object and its backing storage.
 	 * get_pages() is called once prior to the use of the associated set
@@ -198,6 +199,8 @@ struct drm_i915_gem_object {
 		} userptr;
 
 		unsigned long scratch;
+
+		void *gvt_info;
 	};
 
 	/** for phys allocated objects */
@@ -300,6 +303,12 @@ i915_gem_object_is_shrinkable(const struct drm_i915_gem_object *obj)
 }
 
 static inline bool
+i915_gem_object_is_proxy(const struct drm_i915_gem_object *obj)
+{
+	return obj->ops->flags & I915_GEM_OBJECT_IS_PROXY;
+}
+
+static inline bool
 i915_gem_object_is_active(const struct drm_i915_gem_object *obj)
 {
 	return obj->active_count;
diff --git a/drivers/gpu/drm/i915/i915_gem_tiling.c b/drivers/gpu/drm/i915/i915_gem_tiling.c
index fb5231f..21ec066 100644
--- a/drivers/gpu/drm/i915/i915_gem_tiling.c
+++ b/drivers/gpu/drm/i915/i915_gem_tiling.c
@@ -345,6 +345,11 @@ i915_gem_set_tiling_ioctl(struct drm_device *dev, void *data,
 	if (!obj)
 		return -ENOENT;
 
+	if (i915_gem_object_is_proxy(obj)) {
+		err = -EPERM;
+		goto err;
+	}
+
 	if (!i915_tiling_ok(obj, args->tiling_mode, args->stride)) {
 		err = -EINVAL;
 		goto err;
-- 
2.7.4