377 lines
12 KiB
C
377 lines
12 KiB
C
/**************************************************************************
|
|
*
|
|
* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
|
|
* All Rights Reserved.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the
|
|
* "Software"), to deal in the Software without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sub license, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice (including the
|
|
* next paragraph) shall be included in all copies or substantial portions
|
|
* of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
|
|
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
|
|
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
|
|
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
|
|
* USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*
|
|
**************************************************************************/
|
|
/*
|
|
* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
|
|
*/
|
|
/** @file ttm_object.h
|
|
*
|
|
* Base- and reference object implementation for the various
|
|
* ttm objects. Implements reference counting, minimal security checks
|
|
* and release on file close.
|
|
*/
|
|
|
|
#ifndef _TTM_OBJECT_H_
|
|
#define _TTM_OBJECT_H_
|
|
|
|
#include <linux/dma-buf.h>
|
|
#include <linux/kref.h>
|
|
#include <linux/list.h>
|
|
#include <linux/rcupdate.h>
|
|
|
|
#include <drm/drm_hashtab.h>
|
|
#include <drm/ttm/ttm_memory.h>
|
|
|
|
/**
|
|
* enum ttm_ref_type
|
|
*
|
|
* Describes what type of reference a ref object holds.
|
|
*
|
|
* TTM_REF_USAGE is a simple refcount on a base object.
|
|
*
|
|
* TTM_REF_SYNCCPU_READ is a SYNCCPU_READ reference on a
|
|
* buffer object.
|
|
*
|
|
* TTM_REF_SYNCCPU_WRITE is a SYNCCPU_WRITE reference on a
|
|
* buffer object.
|
|
*
|
|
*/
|
|
|
|
enum ttm_ref_type {
|
|
TTM_REF_USAGE,
|
|
TTM_REF_SYNCCPU_READ,
|
|
TTM_REF_SYNCCPU_WRITE,
|
|
TTM_REF_NUM
|
|
};
|
|
|
|
/**
|
|
* enum ttm_object_type
|
|
*
|
|
* One entry per ttm object type.
|
|
* Device-specific types should use the
|
|
* ttm_driver_typex types.
|
|
*/
|
|
|
|
enum ttm_object_type {
|
|
ttm_fence_type,
|
|
ttm_buffer_type,
|
|
ttm_lock_type,
|
|
ttm_prime_type,
|
|
ttm_driver_type0 = 256,
|
|
ttm_driver_type1,
|
|
ttm_driver_type2,
|
|
ttm_driver_type3,
|
|
ttm_driver_type4,
|
|
ttm_driver_type5
|
|
};
|
|
|
|
struct ttm_object_file;
|
|
struct ttm_object_device;
|
|
|
|
/**
|
|
* struct ttm_base_object
|
|
*
|
|
* @hash: hash entry for the per-device object hash.
|
|
* @type: derived type this object is base class for.
|
|
* @shareable: Other ttm_object_files can access this object.
|
|
*
|
|
* @tfile: Pointer to ttm_object_file of the creator.
|
|
* NULL if the object was not created by a user request.
|
|
* (kernel object).
|
|
*
|
|
* @refcount: Number of references to this object, not
|
|
* including the hash entry. A reference to a base object can
|
|
* only be held by a ref object.
|
|
*
|
|
* @refcount_release: A function to be called when there are
|
|
* no more references to this object. This function should
|
|
* destroy the object (or make sure destruction eventually happens),
|
|
* and when it is called, the object has
|
|
* already been taken out of the per-device hash. The parameter
|
|
* "base" should be set to NULL by the function.
|
|
*
|
|
* @ref_obj_release: A function to be called when a reference object
|
|
* with another ttm_ref_type than TTM_REF_USAGE is deleted.
|
|
* This function may, for example, release a lock held by a user-space
|
|
* process.
|
|
*
|
|
* This struct is intended to be used as a base struct for objects that
|
|
* are visible to user-space. It provides a global name, race-safe
|
|
* access and refcounting, minimal access contol and hooks for unref actions.
|
|
*/
|
|
|
|
struct ttm_base_object {
|
|
struct rcu_head rhead;
|
|
struct ttm_object_file *tfile;
|
|
struct kref refcount;
|
|
void (*refcount_release) (struct ttm_base_object **base);
|
|
void (*ref_obj_release) (struct ttm_base_object *base,
|
|
enum ttm_ref_type ref_type);
|
|
u32 handle;
|
|
enum ttm_object_type object_type;
|
|
u32 shareable;
|
|
};
|
|
|
|
|
|
/**
|
|
* 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
|
|
*
|
|
* @tfile: Pointer to a struct ttm_object_file.
|
|
* @base: The struct ttm_base_object to initialize.
|
|
* @shareable: This object is shareable with other applcations.
|
|
* (different @tfile pointers.)
|
|
* @type: The object type.
|
|
* @refcount_release: See the struct ttm_base_object description.
|
|
* @ref_obj_release: See the struct ttm_base_object description.
|
|
*
|
|
* Initializes a struct ttm_base_object.
|
|
*/
|
|
|
|
extern int ttm_base_object_init(struct ttm_object_file *tfile,
|
|
struct ttm_base_object *base,
|
|
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));
|
|
|
|
/**
|
|
* ttm_base_object_lookup
|
|
*
|
|
* @tfile: Pointer to a struct ttm_object_file.
|
|
* @key: Hash key
|
|
*
|
|
* Looks up a struct ttm_base_object with the key @key.
|
|
*/
|
|
|
|
extern struct ttm_base_object *ttm_base_object_lookup(struct ttm_object_file
|
|
*tfile, uint32_t key);
|
|
|
|
/**
|
|
* ttm_base_object_lookup_for_ref
|
|
*
|
|
* @tdev: Pointer to a struct ttm_object_device.
|
|
* @key: Hash key
|
|
*
|
|
* Looks up a struct ttm_base_object with the key @key.
|
|
* This function should only be used when the struct tfile associated with the
|
|
* caller doesn't yet have a reference to the base object.
|
|
*/
|
|
|
|
extern struct ttm_base_object *
|
|
ttm_base_object_lookup_for_ref(struct ttm_object_device *tdev, uint32_t key);
|
|
|
|
/**
|
|
* ttm_base_object_unref
|
|
*
|
|
* @p_base: Pointer to a pointer referencing a struct ttm_base_object.
|
|
*
|
|
* Decrements the base object refcount and clears the pointer pointed to by
|
|
* p_base.
|
|
*/
|
|
|
|
extern void ttm_base_object_unref(struct ttm_base_object **p_base);
|
|
|
|
/**
|
|
* ttm_ref_object_add.
|
|
*
|
|
* @tfile: A struct ttm_object_file representing the application owning the
|
|
* ref_object.
|
|
* @base: The base object to reference.
|
|
* @ref_type: The type of reference.
|
|
* @existed: Upon completion, indicates that an identical reference object
|
|
* already existed, and the refcount was upped on that object instead.
|
|
* @require_existed: Fail with -EPERM if an identical ref object didn't
|
|
* already exist.
|
|
*
|
|
* Checks that the base object is shareable and adds a ref object to it.
|
|
*
|
|
* Adding a ref object to a base object is basically like referencing the
|
|
* base object, but a user-space application holds the reference. When the
|
|
* file corresponding to @tfile is closed, all its reference objects are
|
|
* deleted. A reference object can have different types depending on what
|
|
* it's intended for. It can be refcounting to prevent object destruction,
|
|
* When user-space takes a lock, it can add a ref object to that lock to
|
|
* make sure the lock is released if the application dies. A ref object
|
|
* will hold a single reference on a base object.
|
|
*/
|
|
extern int ttm_ref_object_add(struct ttm_object_file *tfile,
|
|
struct ttm_base_object *base,
|
|
enum ttm_ref_type ref_type, bool *existed,
|
|
bool require_existed);
|
|
|
|
extern bool ttm_ref_object_exists(struct ttm_object_file *tfile,
|
|
struct ttm_base_object *base);
|
|
|
|
/**
|
|
* ttm_ref_object_base_unref
|
|
*
|
|
* @key: Key representing the base object.
|
|
* @ref_type: Ref type of the ref object to be dereferenced.
|
|
*
|
|
* Unreference a ref object with type @ref_type
|
|
* on the base object identified by @key. If there are no duplicate
|
|
* references, the ref object will be destroyed and the base object
|
|
* will be unreferenced.
|
|
*/
|
|
extern int ttm_ref_object_base_unref(struct ttm_object_file *tfile,
|
|
unsigned long key,
|
|
enum ttm_ref_type ref_type);
|
|
|
|
/**
|
|
* ttm_object_file_init - initialize a struct ttm_object file
|
|
*
|
|
* @tdev: A struct ttm_object device this file is initialized on.
|
|
* @hash_order: Order of the hash table used to hold the reference objects.
|
|
*
|
|
* This is typically called by the file_ops::open function.
|
|
*/
|
|
|
|
extern struct ttm_object_file *ttm_object_file_init(struct ttm_object_device
|
|
*tdev,
|
|
unsigned int hash_order);
|
|
|
|
/**
|
|
* ttm_object_file_release - release data held by a ttm_object_file
|
|
*
|
|
* @p_tfile: Pointer to pointer to the ttm_object_file object to release.
|
|
* *p_tfile will be set to NULL by this function.
|
|
*
|
|
* Releases all data associated by a ttm_object_file.
|
|
* Typically called from file_ops::release. The caller must
|
|
* ensure that there are no concurrent users of tfile.
|
|
*/
|
|
|
|
extern void ttm_object_file_release(struct ttm_object_file **p_tfile);
|
|
|
|
/**
|
|
* 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,
|
|
const struct dma_buf_ops *ops);
|
|
|
|
/**
|
|
* ttm_object_device_release - release data held by a ttm_object_device
|
|
*
|
|
* @p_tdev: Pointer to pointer to the ttm_object_device object to release.
|
|
* *p_tdev will be set to NULL by this function.
|
|
*
|
|
* Releases all data associated by a ttm_object_device.
|
|
* Typically called from driver::unload before the destruction of the
|
|
* device private data structure.
|
|
*/
|
|
|
|
extern void ttm_object_device_release(struct ttm_object_device **p_tdev);
|
|
|
|
#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)
|
|
|
|
/*
|
|
* Extra memory required by the base object's idr storage, which is allocated
|
|
* separately from the base object itself. We estimate an on-average 128 bytes
|
|
* per idr.
|
|
*/
|
|
#define TTM_OBJ_EXTRA_SIZE 128
|
|
|
|
struct ttm_base_object *
|
|
ttm_base_object_noref_lookup(struct ttm_object_file *tfile, uint32_t key);
|
|
|
|
/**
|
|
* ttm_base_object_noref_release - release a base object pointer looked up
|
|
* without reference
|
|
*
|
|
* Releases a base object pointer looked up with ttm_base_object_noref_lookup().
|
|
*/
|
|
static inline void ttm_base_object_noref_release(void)
|
|
{
|
|
__acquire(RCU);
|
|
rcu_read_unlock();
|
|
}
|
|
#endif
|