drm/ttm: Add a minimal prime implementation for ttm base objects
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>
diff --git a/include/drm/ttm/ttm_object.h b/include/drm/ttm/ttm_object.h
index fc0cf06..58b0298 100644
--- a/include/drm/ttm/ttm_object.h
+++ b/include/drm/ttm/ttm_object.h
@@ -41,6 +41,7 @@
#include <drm/drm_hashtab.h>
#include <linux/kref.h>
#include <linux/rcupdate.h>
+#include <linux/dma-buf.h>
#include <ttm/ttm_memory.h>
/**
@@ -77,6 +78,7 @@
ttm_fence_type,
ttm_buffer_type,
ttm_lock_type,
+ ttm_prime_type,
ttm_driver_type0 = 256,
ttm_driver_type1,
ttm_driver_type2,
@@ -132,6 +134,30 @@
enum ttm_ref_type ref_type);
};
+
+/**
+ * struct ttm_prime_object - Modified base object that is prime-aware
+ *
+ * @base: struct ttm_base_object that we derive from
+ * @mutex: Mutex protecting the @dma_buf member.
+ * @size: Size of the dma_buf associated with this object
+ * @real_type: Type of the underlying object. Needed since we're setting
+ * the value of @base::object_type to ttm_prime_type
+ * @dma_buf: Non ref-coutned pointer to a struct dma_buf created from this
+ * object.
+ * @refcount_release: The underlying object's release method. Needed since
+ * we set @base::refcount_release to our own release method.
+ */
+
+struct ttm_prime_object {
+ struct ttm_base_object base;
+ struct mutex mutex;
+ size_t size;
+ enum ttm_object_type real_type;
+ struct dma_buf *dma_buf;
+ void (*refcount_release) (struct ttm_base_object **);
+};
+
/**
* ttm_base_object_init
*
@@ -248,14 +274,18 @@
/**
* ttm_object device init - initialize a struct ttm_object_device
*
+ * @mem_glob: struct ttm_mem_global for memory accounting.
* @hash_order: Order of hash table used to hash the base objects.
+ * @ops: DMA buf ops for prime objects of this device.
*
* This function is typically called on device initialization to prepare
* data structures needed for ttm base and ref objects.
*/
-extern struct ttm_object_device *ttm_object_device_init
- (struct ttm_mem_global *mem_glob, unsigned int hash_order);
+extern struct ttm_object_device *
+ttm_object_device_init(struct ttm_mem_global *mem_glob,
+ unsigned int hash_order,
+ const struct dma_buf_ops *ops);
/**
* ttm_object_device_release - release data held by a ttm_object_device
@@ -272,4 +302,31 @@
#define ttm_base_object_kfree(__object, __base)\
kfree_rcu(__object, __base.rhead)
+
+extern int ttm_prime_object_init(struct ttm_object_file *tfile,
+ size_t size,
+ struct ttm_prime_object *prime,
+ bool shareable,
+ enum ttm_object_type type,
+ void (*refcount_release)
+ (struct ttm_base_object **),
+ void (*ref_obj_release)
+ (struct ttm_base_object *,
+ enum ttm_ref_type ref_type));
+
+static inline enum ttm_object_type
+ttm_base_object_type(struct ttm_base_object *base)
+{
+ return (base->object_type == ttm_prime_type) ?
+ container_of(base, struct ttm_prime_object, base)->real_type :
+ base->object_type;
+}
+extern int ttm_prime_fd_to_handle(struct ttm_object_file *tfile,
+ int fd, u32 *handle);
+extern int ttm_prime_handle_to_fd(struct ttm_object_file *tfile,
+ uint32_t handle, uint32_t flags,
+ int *prime_fd);
+
+#define ttm_prime_object_kfree(__obj, __prime) \
+ kfree_rcu(__obj, __prime.base.rhead)
#endif