761 lines
20 KiB
C
761 lines
20 KiB
C
/**************************************************************************
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*
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* Copyright (c) 2009-2013 VMware, Inc., Palo Alto, CA., USA
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/*
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* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
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*
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* While no substantial code is shared, the prime code is inspired by
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* drm_prime.c, with
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* Authors:
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* Dave Airlie <airlied@redhat.com>
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* Rob Clark <rob.clark@linaro.org>
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*/
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/** @file ttm_ref_object.c
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*
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* Base- and reference object implementation for the various
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* ttm objects. Implements reference counting, minimal security checks
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* and release on file close.
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*/
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/**
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* struct ttm_object_file
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*
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* @tdev: Pointer to the ttm_object_device.
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*
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* @lock: Lock that protects the ref_list list and the
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* ref_hash hash tables.
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*
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* @ref_list: List of ttm_ref_objects to be destroyed at
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* file release.
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*
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* @ref_hash: Hash tables of ref objects, one per ttm_ref_type,
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* for fast lookup of ref objects given a base object.
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*/
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#define pr_fmt(fmt) "[TTM] " fmt
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#include <drm/ttm/ttm_object.h>
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#include <drm/ttm/ttm_module.h>
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/atomic.h>
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struct ttm_object_file {
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struct ttm_object_device *tdev;
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spinlock_t lock;
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struct list_head ref_list;
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struct drm_open_hash ref_hash[TTM_REF_NUM];
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struct kref refcount;
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};
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/**
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* struct ttm_object_device
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*
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* @object_lock: lock that protects the object_hash hash table.
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*
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* @object_hash: hash table for fast lookup of object global names.
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*
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* @object_count: Per device object count.
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*
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* This is the per-device data structure needed for ttm object management.
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*/
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struct ttm_object_device {
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spinlock_t object_lock;
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struct drm_open_hash object_hash;
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atomic_t object_count;
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struct ttm_mem_global *mem_glob;
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struct dma_buf_ops ops;
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void (*dmabuf_release)(struct dma_buf *dma_buf);
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size_t dma_buf_size;
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};
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/**
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* struct ttm_ref_object
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*
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* @hash: Hash entry for the per-file object reference hash.
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*
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* @head: List entry for the per-file list of ref-objects.
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*
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* @kref: Ref count.
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*
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* @obj: Base object this ref object is referencing.
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*
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* @ref_type: Type of ref object.
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*
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* This is similar to an idr object, but it also has a hash table entry
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* that allows lookup with a pointer to the referenced object as a key. In
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* that way, one can easily detect whether a base object is referenced by
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* a particular ttm_object_file. It also carries a ref count to avoid creating
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* multiple ref objects if a ttm_object_file references the same base
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* object more than once.
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*/
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struct ttm_ref_object {
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struct rcu_head rcu_head;
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struct drm_hash_item hash;
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struct list_head head;
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struct kref kref;
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enum ttm_ref_type ref_type;
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struct ttm_base_object *obj;
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struct ttm_object_file *tfile;
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};
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static void ttm_prime_dmabuf_release(struct dma_buf *dma_buf);
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static inline struct ttm_object_file *
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ttm_object_file_ref(struct ttm_object_file *tfile)
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{
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kref_get(&tfile->refcount);
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return tfile;
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}
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static void ttm_object_file_destroy(struct kref *kref)
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{
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struct ttm_object_file *tfile =
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container_of(kref, struct ttm_object_file, refcount);
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kfree(tfile);
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}
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static inline void ttm_object_file_unref(struct ttm_object_file **p_tfile)
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{
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struct ttm_object_file *tfile = *p_tfile;
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*p_tfile = NULL;
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kref_put(&tfile->refcount, ttm_object_file_destroy);
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}
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int ttm_base_object_init(struct ttm_object_file *tfile,
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struct ttm_base_object *base,
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bool shareable,
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enum ttm_object_type object_type,
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void (*refcount_release) (struct ttm_base_object **),
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void (*ref_obj_release) (struct ttm_base_object *,
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enum ttm_ref_type ref_type))
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{
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struct ttm_object_device *tdev = tfile->tdev;
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int ret;
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base->shareable = shareable;
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base->tfile = ttm_object_file_ref(tfile);
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base->refcount_release = refcount_release;
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base->ref_obj_release = ref_obj_release;
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base->object_type = object_type;
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kref_init(&base->refcount);
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spin_lock(&tdev->object_lock);
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ret = drm_ht_just_insert_please_rcu(&tdev->object_hash,
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&base->hash,
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(unsigned long)base, 31, 0, 0);
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spin_unlock(&tdev->object_lock);
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if (unlikely(ret != 0))
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goto out_err0;
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ret = ttm_ref_object_add(tfile, base, TTM_REF_USAGE, NULL);
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if (unlikely(ret != 0))
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goto out_err1;
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ttm_base_object_unref(&base);
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return 0;
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out_err1:
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spin_lock(&tdev->object_lock);
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(void)drm_ht_remove_item_rcu(&tdev->object_hash, &base->hash);
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spin_unlock(&tdev->object_lock);
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out_err0:
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return ret;
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}
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EXPORT_SYMBOL(ttm_base_object_init);
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static void ttm_release_base(struct kref *kref)
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{
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struct ttm_base_object *base =
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container_of(kref, struct ttm_base_object, refcount);
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struct ttm_object_device *tdev = base->tfile->tdev;
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spin_lock(&tdev->object_lock);
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(void)drm_ht_remove_item_rcu(&tdev->object_hash, &base->hash);
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spin_unlock(&tdev->object_lock);
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/*
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* Note: We don't use synchronize_rcu() here because it's far
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* too slow. It's up to the user to free the object using
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* call_rcu() or ttm_base_object_kfree().
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*/
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ttm_object_file_unref(&base->tfile);
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if (base->refcount_release)
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base->refcount_release(&base);
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}
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void ttm_base_object_unref(struct ttm_base_object **p_base)
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{
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struct ttm_base_object *base = *p_base;
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*p_base = NULL;
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kref_put(&base->refcount, ttm_release_base);
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}
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EXPORT_SYMBOL(ttm_base_object_unref);
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struct ttm_base_object *ttm_base_object_lookup(struct ttm_object_file *tfile,
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uint32_t key)
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{
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struct ttm_base_object *base = NULL;
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struct drm_hash_item *hash;
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struct drm_open_hash *ht = &tfile->ref_hash[TTM_REF_USAGE];
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int ret;
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rcu_read_lock();
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ret = drm_ht_find_item_rcu(ht, key, &hash);
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if (likely(ret == 0)) {
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base = drm_hash_entry(hash, struct ttm_ref_object, hash)->obj;
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if (!kref_get_unless_zero(&base->refcount))
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base = NULL;
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}
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rcu_read_unlock();
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return base;
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}
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EXPORT_SYMBOL(ttm_base_object_lookup);
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struct ttm_base_object *
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ttm_base_object_lookup_for_ref(struct ttm_object_device *tdev, uint32_t key)
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{
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struct ttm_base_object *base = NULL;
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struct drm_hash_item *hash;
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struct drm_open_hash *ht = &tdev->object_hash;
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int ret;
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rcu_read_lock();
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ret = drm_ht_find_item_rcu(ht, key, &hash);
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if (likely(ret == 0)) {
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base = drm_hash_entry(hash, struct ttm_base_object, hash);
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if (!kref_get_unless_zero(&base->refcount))
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base = NULL;
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}
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rcu_read_unlock();
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return base;
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}
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EXPORT_SYMBOL(ttm_base_object_lookup_for_ref);
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/**
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* ttm_ref_object_exists - Check whether a caller has a valid ref object
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* (has opened) a base object.
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*
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* @tfile: Pointer to a struct ttm_object_file identifying the caller.
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* @base: Pointer to a struct base object.
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*
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* Checks wether the caller identified by @tfile has put a valid USAGE
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* reference object on the base object identified by @base.
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*/
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bool ttm_ref_object_exists(struct ttm_object_file *tfile,
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struct ttm_base_object *base)
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{
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struct drm_open_hash *ht = &tfile->ref_hash[TTM_REF_USAGE];
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struct drm_hash_item *hash;
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struct ttm_ref_object *ref;
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rcu_read_lock();
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if (unlikely(drm_ht_find_item_rcu(ht, base->hash.key, &hash) != 0))
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goto out_false;
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/*
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* Verify that the ref object is really pointing to our base object.
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* Our base object could actually be dead, and the ref object pointing
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* to another base object with the same handle.
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*/
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ref = drm_hash_entry(hash, struct ttm_ref_object, hash);
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if (unlikely(base != ref->obj))
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goto out_false;
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/*
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* Verify that the ref->obj pointer was actually valid!
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*/
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rmb();
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if (unlikely(atomic_read(&ref->kref.refcount) == 0))
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goto out_false;
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rcu_read_unlock();
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return true;
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out_false:
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rcu_read_unlock();
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return false;
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}
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EXPORT_SYMBOL(ttm_ref_object_exists);
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int ttm_ref_object_add(struct ttm_object_file *tfile,
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struct ttm_base_object *base,
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enum ttm_ref_type ref_type, bool *existed)
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{
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struct drm_open_hash *ht = &tfile->ref_hash[ref_type];
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struct ttm_ref_object *ref;
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struct drm_hash_item *hash;
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struct ttm_mem_global *mem_glob = tfile->tdev->mem_glob;
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int ret = -EINVAL;
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if (base->tfile != tfile && !base->shareable)
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return -EPERM;
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if (existed != NULL)
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*existed = true;
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while (ret == -EINVAL) {
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rcu_read_lock();
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ret = drm_ht_find_item_rcu(ht, base->hash.key, &hash);
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if (ret == 0) {
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ref = drm_hash_entry(hash, struct ttm_ref_object, hash);
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if (kref_get_unless_zero(&ref->kref)) {
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rcu_read_unlock();
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break;
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}
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}
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rcu_read_unlock();
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ret = ttm_mem_global_alloc(mem_glob, sizeof(*ref),
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false, false);
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if (unlikely(ret != 0))
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return ret;
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ref = kmalloc(sizeof(*ref), GFP_KERNEL);
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if (unlikely(ref == NULL)) {
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ttm_mem_global_free(mem_glob, sizeof(*ref));
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return -ENOMEM;
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}
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ref->hash.key = base->hash.key;
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ref->obj = base;
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ref->tfile = tfile;
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ref->ref_type = ref_type;
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kref_init(&ref->kref);
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spin_lock(&tfile->lock);
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ret = drm_ht_insert_item_rcu(ht, &ref->hash);
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if (likely(ret == 0)) {
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list_add_tail(&ref->head, &tfile->ref_list);
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kref_get(&base->refcount);
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spin_unlock(&tfile->lock);
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if (existed != NULL)
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*existed = false;
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break;
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}
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spin_unlock(&tfile->lock);
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BUG_ON(ret != -EINVAL);
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ttm_mem_global_free(mem_glob, sizeof(*ref));
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kfree(ref);
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}
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return ret;
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}
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EXPORT_SYMBOL(ttm_ref_object_add);
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static void ttm_ref_object_release(struct kref *kref)
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{
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struct ttm_ref_object *ref =
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container_of(kref, struct ttm_ref_object, kref);
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struct ttm_base_object *base = ref->obj;
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struct ttm_object_file *tfile = ref->tfile;
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struct drm_open_hash *ht;
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struct ttm_mem_global *mem_glob = tfile->tdev->mem_glob;
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ht = &tfile->ref_hash[ref->ref_type];
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(void)drm_ht_remove_item_rcu(ht, &ref->hash);
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list_del(&ref->head);
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spin_unlock(&tfile->lock);
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if (ref->ref_type != TTM_REF_USAGE && base->ref_obj_release)
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base->ref_obj_release(base, ref->ref_type);
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ttm_base_object_unref(&ref->obj);
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ttm_mem_global_free(mem_glob, sizeof(*ref));
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kfree_rcu(ref, rcu_head);
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spin_lock(&tfile->lock);
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}
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int ttm_ref_object_base_unref(struct ttm_object_file *tfile,
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unsigned long key, enum ttm_ref_type ref_type)
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{
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struct drm_open_hash *ht = &tfile->ref_hash[ref_type];
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struct ttm_ref_object *ref;
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struct drm_hash_item *hash;
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int ret;
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spin_lock(&tfile->lock);
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ret = drm_ht_find_item(ht, key, &hash);
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if (unlikely(ret != 0)) {
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spin_unlock(&tfile->lock);
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return -EINVAL;
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}
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ref = drm_hash_entry(hash, struct ttm_ref_object, hash);
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kref_put(&ref->kref, ttm_ref_object_release);
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spin_unlock(&tfile->lock);
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return 0;
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}
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EXPORT_SYMBOL(ttm_ref_object_base_unref);
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void ttm_object_file_release(struct ttm_object_file **p_tfile)
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{
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struct ttm_ref_object *ref;
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struct list_head *list;
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unsigned int i;
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struct ttm_object_file *tfile = *p_tfile;
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*p_tfile = NULL;
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spin_lock(&tfile->lock);
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/*
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* Since we release the lock within the loop, we have to
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* restart it from the beginning each time.
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*/
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while (!list_empty(&tfile->ref_list)) {
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list = tfile->ref_list.next;
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ref = list_entry(list, struct ttm_ref_object, head);
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ttm_ref_object_release(&ref->kref);
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}
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for (i = 0; i < TTM_REF_NUM; ++i)
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drm_ht_remove(&tfile->ref_hash[i]);
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spin_unlock(&tfile->lock);
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ttm_object_file_unref(&tfile);
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}
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EXPORT_SYMBOL(ttm_object_file_release);
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struct ttm_object_file *ttm_object_file_init(struct ttm_object_device *tdev,
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unsigned int hash_order)
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{
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struct ttm_object_file *tfile = kmalloc(sizeof(*tfile), GFP_KERNEL);
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unsigned int i;
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unsigned int j = 0;
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int ret;
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if (unlikely(tfile == NULL))
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return NULL;
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spin_lock_init(&tfile->lock);
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tfile->tdev = tdev;
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kref_init(&tfile->refcount);
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INIT_LIST_HEAD(&tfile->ref_list);
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for (i = 0; i < TTM_REF_NUM; ++i) {
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ret = drm_ht_create(&tfile->ref_hash[i], hash_order);
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if (ret) {
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j = i;
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goto out_err;
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}
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}
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return tfile;
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out_err:
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for (i = 0; i < j; ++i)
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drm_ht_remove(&tfile->ref_hash[i]);
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kfree(tfile);
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return NULL;
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}
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EXPORT_SYMBOL(ttm_object_file_init);
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struct ttm_object_device *
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ttm_object_device_init(struct ttm_mem_global *mem_glob,
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unsigned int hash_order,
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const struct dma_buf_ops *ops)
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{
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struct ttm_object_device *tdev = kmalloc(sizeof(*tdev), GFP_KERNEL);
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int ret;
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if (unlikely(tdev == NULL))
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return NULL;
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tdev->mem_glob = mem_glob;
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spin_lock_init(&tdev->object_lock);
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atomic_set(&tdev->object_count, 0);
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ret = drm_ht_create(&tdev->object_hash, hash_order);
|
|
if (ret != 0)
|
|
goto out_no_object_hash;
|
|
|
|
tdev->ops = *ops;
|
|
tdev->dmabuf_release = tdev->ops.release;
|
|
tdev->ops.release = ttm_prime_dmabuf_release;
|
|
tdev->dma_buf_size = ttm_round_pot(sizeof(struct dma_buf)) +
|
|
ttm_round_pot(sizeof(struct file));
|
|
return tdev;
|
|
|
|
out_no_object_hash:
|
|
kfree(tdev);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(ttm_object_device_init);
|
|
|
|
void ttm_object_device_release(struct ttm_object_device **p_tdev)
|
|
{
|
|
struct ttm_object_device *tdev = *p_tdev;
|
|
|
|
*p_tdev = NULL;
|
|
|
|
spin_lock(&tdev->object_lock);
|
|
drm_ht_remove(&tdev->object_hash);
|
|
spin_unlock(&tdev->object_lock);
|
|
|
|
kfree(tdev);
|
|
}
|
|
EXPORT_SYMBOL(ttm_object_device_release);
|
|
|
|
/**
|
|
* get_dma_buf_unless_doomed - get a dma_buf reference if possible.
|
|
*
|
|
* @dma_buf: Non-refcounted pointer to a struct dma-buf.
|
|
*
|
|
* Obtain a file reference from a lookup structure that doesn't refcount
|
|
* the file, but synchronizes with its release method to make sure it has
|
|
* not been freed yet. See for example kref_get_unless_zero documentation.
|
|
* Returns true if refcounting succeeds, false otherwise.
|
|
*
|
|
* Nobody really wants this as a public API yet, so let it mature here
|
|
* for some time...
|
|
*/
|
|
static bool __must_check get_dma_buf_unless_doomed(struct dma_buf *dmabuf)
|
|
{
|
|
return atomic_long_inc_not_zero(&dmabuf->file->f_count) != 0L;
|
|
}
|
|
|
|
/**
|
|
* ttm_prime_refcount_release - refcount release method for a prime object.
|
|
*
|
|
* @p_base: Pointer to ttm_base_object pointer.
|
|
*
|
|
* This is a wrapper that calls the refcount_release founction of the
|
|
* underlying object. At the same time it cleans up the prime object.
|
|
* This function is called when all references to the base object we
|
|
* derive from are gone.
|
|
*/
|
|
static void ttm_prime_refcount_release(struct ttm_base_object **p_base)
|
|
{
|
|
struct ttm_base_object *base = *p_base;
|
|
struct ttm_prime_object *prime;
|
|
|
|
*p_base = NULL;
|
|
prime = container_of(base, struct ttm_prime_object, base);
|
|
BUG_ON(prime->dma_buf != NULL);
|
|
mutex_destroy(&prime->mutex);
|
|
if (prime->refcount_release)
|
|
prime->refcount_release(&base);
|
|
}
|
|
|
|
/**
|
|
* ttm_prime_dmabuf_release - Release method for the dma-bufs we export
|
|
*
|
|
* @dma_buf:
|
|
*
|
|
* This function first calls the dma_buf release method the driver
|
|
* provides. Then it cleans up our dma_buf pointer used for lookup,
|
|
* and finally releases the reference the dma_buf has on our base
|
|
* object.
|
|
*/
|
|
static void ttm_prime_dmabuf_release(struct dma_buf *dma_buf)
|
|
{
|
|
struct ttm_prime_object *prime =
|
|
(struct ttm_prime_object *) dma_buf->priv;
|
|
struct ttm_base_object *base = &prime->base;
|
|
struct ttm_object_device *tdev = base->tfile->tdev;
|
|
|
|
if (tdev->dmabuf_release)
|
|
tdev->dmabuf_release(dma_buf);
|
|
mutex_lock(&prime->mutex);
|
|
if (prime->dma_buf == dma_buf)
|
|
prime->dma_buf = NULL;
|
|
mutex_unlock(&prime->mutex);
|
|
ttm_mem_global_free(tdev->mem_glob, tdev->dma_buf_size);
|
|
ttm_base_object_unref(&base);
|
|
}
|
|
|
|
/**
|
|
* ttm_prime_fd_to_handle - Get a base object handle from a prime fd
|
|
*
|
|
* @tfile: A struct ttm_object_file identifying the caller.
|
|
* @fd: The prime / dmabuf fd.
|
|
* @handle: The returned handle.
|
|
*
|
|
* This function returns a handle to an object that previously exported
|
|
* a dma-buf. Note that we don't handle imports yet, because we simply
|
|
* have no consumers of that implementation.
|
|
*/
|
|
int ttm_prime_fd_to_handle(struct ttm_object_file *tfile,
|
|
int fd, u32 *handle)
|
|
{
|
|
struct ttm_object_device *tdev = tfile->tdev;
|
|
struct dma_buf *dma_buf;
|
|
struct ttm_prime_object *prime;
|
|
struct ttm_base_object *base;
|
|
int ret;
|
|
|
|
dma_buf = dma_buf_get(fd);
|
|
if (IS_ERR(dma_buf))
|
|
return PTR_ERR(dma_buf);
|
|
|
|
if (dma_buf->ops != &tdev->ops)
|
|
return -ENOSYS;
|
|
|
|
prime = (struct ttm_prime_object *) dma_buf->priv;
|
|
base = &prime->base;
|
|
*handle = base->hash.key;
|
|
ret = ttm_ref_object_add(tfile, base, TTM_REF_USAGE, NULL);
|
|
|
|
dma_buf_put(dma_buf);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ttm_prime_fd_to_handle);
|
|
|
|
/**
|
|
* ttm_prime_handle_to_fd - Return a dma_buf fd from a ttm prime object
|
|
*
|
|
* @tfile: Struct ttm_object_file identifying the caller.
|
|
* @handle: Handle to the object we're exporting from.
|
|
* @flags: flags for dma-buf creation. We just pass them on.
|
|
* @prime_fd: The returned file descriptor.
|
|
*
|
|
*/
|
|
int ttm_prime_handle_to_fd(struct ttm_object_file *tfile,
|
|
uint32_t handle, uint32_t flags,
|
|
int *prime_fd)
|
|
{
|
|
struct ttm_object_device *tdev = tfile->tdev;
|
|
struct ttm_base_object *base;
|
|
struct dma_buf *dma_buf;
|
|
struct ttm_prime_object *prime;
|
|
int ret;
|
|
|
|
base = ttm_base_object_lookup(tfile, handle);
|
|
if (unlikely(base == NULL ||
|
|
base->object_type != ttm_prime_type)) {
|
|
ret = -ENOENT;
|
|
goto out_unref;
|
|
}
|
|
|
|
prime = container_of(base, struct ttm_prime_object, base);
|
|
if (unlikely(!base->shareable)) {
|
|
ret = -EPERM;
|
|
goto out_unref;
|
|
}
|
|
|
|
ret = mutex_lock_interruptible(&prime->mutex);
|
|
if (unlikely(ret != 0)) {
|
|
ret = -ERESTARTSYS;
|
|
goto out_unref;
|
|
}
|
|
|
|
dma_buf = prime->dma_buf;
|
|
if (!dma_buf || !get_dma_buf_unless_doomed(dma_buf)) {
|
|
|
|
/*
|
|
* Need to create a new dma_buf, with memory accounting.
|
|
*/
|
|
ret = ttm_mem_global_alloc(tdev->mem_glob, tdev->dma_buf_size,
|
|
false, true);
|
|
if (unlikely(ret != 0)) {
|
|
mutex_unlock(&prime->mutex);
|
|
goto out_unref;
|
|
}
|
|
|
|
dma_buf = dma_buf_export(prime, &tdev->ops,
|
|
prime->size, flags, NULL);
|
|
if (IS_ERR(dma_buf)) {
|
|
ret = PTR_ERR(dma_buf);
|
|
ttm_mem_global_free(tdev->mem_glob,
|
|
tdev->dma_buf_size);
|
|
mutex_unlock(&prime->mutex);
|
|
goto out_unref;
|
|
}
|
|
|
|
/*
|
|
* dma_buf has taken the base object reference
|
|
*/
|
|
base = NULL;
|
|
prime->dma_buf = dma_buf;
|
|
}
|
|
mutex_unlock(&prime->mutex);
|
|
|
|
ret = dma_buf_fd(dma_buf, flags);
|
|
if (ret >= 0) {
|
|
*prime_fd = ret;
|
|
ret = 0;
|
|
} else
|
|
dma_buf_put(dma_buf);
|
|
|
|
out_unref:
|
|
if (base)
|
|
ttm_base_object_unref(&base);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ttm_prime_handle_to_fd);
|
|
|
|
/**
|
|
* ttm_prime_object_init - Initialize a ttm_prime_object
|
|
*
|
|
* @tfile: struct ttm_object_file identifying the caller
|
|
* @size: The size of the dma_bufs we export.
|
|
* @prime: The object to be initialized.
|
|
* @shareable: See ttm_base_object_init
|
|
* @type: See ttm_base_object_init
|
|
* @refcount_release: See ttm_base_object_init
|
|
* @ref_obj_release: See ttm_base_object_init
|
|
*
|
|
* Initializes an object which is compatible with the drm_prime model
|
|
* for data sharing between processes and devices.
|
|
*/
|
|
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))
|
|
{
|
|
mutex_init(&prime->mutex);
|
|
prime->size = PAGE_ALIGN(size);
|
|
prime->real_type = type;
|
|
prime->dma_buf = NULL;
|
|
prime->refcount_release = refcount_release;
|
|
return ttm_base_object_init(tfile, &prime->base, shareable,
|
|
ttm_prime_type,
|
|
ttm_prime_refcount_release,
|
|
ref_obj_release);
|
|
}
|
|
EXPORT_SYMBOL(ttm_prime_object_init);
|