mirror of
https://github.com/torvalds/linux.git
synced 2024-11-01 13:03:25 +01:00
b2d4da31a1
Once something had been put into descriptor table, the only thing you can do with it is returning descriptor to userland - you can't withdraw it on subsequent failure exit, etc. You certainly can't count upon it staying in the same slot of descriptor table - another thread could've played with close(2)/dup2(2)/whatnot. drm_gem_prime_handle_to_fd() creates a dmabuf, allocates a descriptor and attaches dmabuf's file to it (the last two steps are done in dma_buf_fd()). That's nice when all you are going to do is passing a descriptor to userland. If you just need to work with the resulting object or have something else to be done that might fail, drm_gem_prime_handle_to_fd() is racy. The problem is analogous to one with anon_inode_getfd(), and solution is similar to what anon_inode_getfile() provides. Add drm_gem_prime_handle_to_dmabuf() - the "set dmabuf up" parts of drm_gem_prime_handle_to_fd() without the descriptor-related ones. Instead of inserting into descriptor table and returning the file descriptor it just returns the struct file. drm_gem_prime_handle_to_fd() becomes a wrapper for it. Other users will be introduced in the next commit. Acked-by: Thomas Zimmermann <tzimmermann@suse.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
116 lines
4.2 KiB
C
116 lines
4.2 KiB
C
/*
|
|
* Copyright © 2012 Red Hat
|
|
* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
|
|
* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
|
|
* Copyright (c) 2009-2010, Code Aurora Forum.
|
|
*
|
|
* 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, sublicense,
|
|
* 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 NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS 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:
|
|
* Dave Airlie <airlied@redhat.com>
|
|
* Rob Clark <rob.clark@linaro.org>
|
|
*
|
|
*/
|
|
|
|
#ifndef __DRM_PRIME_H__
|
|
#define __DRM_PRIME_H__
|
|
|
|
#include <linux/mutex.h>
|
|
#include <linux/rbtree.h>
|
|
#include <linux/scatterlist.h>
|
|
|
|
/**
|
|
* struct drm_prime_file_private - per-file tracking for PRIME
|
|
*
|
|
* This just contains the internal &struct dma_buf and handle caches for each
|
|
* &struct drm_file used by the PRIME core code.
|
|
*/
|
|
struct drm_prime_file_private {
|
|
/* private: */
|
|
struct mutex lock;
|
|
struct rb_root dmabufs;
|
|
struct rb_root handles;
|
|
};
|
|
|
|
struct device;
|
|
|
|
struct dma_buf_export_info;
|
|
struct dma_buf;
|
|
struct dma_buf_attachment;
|
|
struct iosys_map;
|
|
|
|
enum dma_data_direction;
|
|
|
|
struct drm_device;
|
|
struct drm_gem_object;
|
|
struct drm_file;
|
|
|
|
/* core prime functions */
|
|
struct dma_buf *drm_gem_dmabuf_export(struct drm_device *dev,
|
|
struct dma_buf_export_info *exp_info);
|
|
void drm_gem_dmabuf_release(struct dma_buf *dma_buf);
|
|
|
|
int drm_gem_prime_fd_to_handle(struct drm_device *dev,
|
|
struct drm_file *file_priv, int prime_fd, uint32_t *handle);
|
|
struct dma_buf *drm_gem_prime_handle_to_dmabuf(struct drm_device *dev,
|
|
struct drm_file *file_priv, uint32_t handle,
|
|
uint32_t flags);
|
|
int drm_gem_prime_handle_to_fd(struct drm_device *dev,
|
|
struct drm_file *file_priv, uint32_t handle, uint32_t flags,
|
|
int *prime_fd);
|
|
|
|
/* helper functions for exporting */
|
|
int drm_gem_map_attach(struct dma_buf *dma_buf,
|
|
struct dma_buf_attachment *attach);
|
|
void drm_gem_map_detach(struct dma_buf *dma_buf,
|
|
struct dma_buf_attachment *attach);
|
|
struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,
|
|
enum dma_data_direction dir);
|
|
void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
|
|
struct sg_table *sgt,
|
|
enum dma_data_direction dir);
|
|
int drm_gem_dmabuf_vmap(struct dma_buf *dma_buf, struct iosys_map *map);
|
|
void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, struct iosys_map *map);
|
|
|
|
int drm_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma);
|
|
int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma);
|
|
|
|
struct sg_table *drm_prime_pages_to_sg(struct drm_device *dev,
|
|
struct page **pages, unsigned int nr_pages);
|
|
struct dma_buf *drm_gem_prime_export(struct drm_gem_object *obj,
|
|
int flags);
|
|
|
|
unsigned long drm_prime_get_contiguous_size(struct sg_table *sgt);
|
|
|
|
/* helper functions for importing */
|
|
struct drm_gem_object *drm_gem_prime_import_dev(struct drm_device *dev,
|
|
struct dma_buf *dma_buf,
|
|
struct device *attach_dev);
|
|
struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev,
|
|
struct dma_buf *dma_buf);
|
|
|
|
void drm_prime_gem_destroy(struct drm_gem_object *obj, struct sg_table *sg);
|
|
|
|
int drm_prime_sg_to_page_array(struct sg_table *sgt, struct page **pages,
|
|
int max_pages);
|
|
int drm_prime_sg_to_dma_addr_array(struct sg_table *sgt, dma_addr_t *addrs,
|
|
int max_pages);
|
|
|
|
#endif /* __DRM_PRIME_H__ */
|