450 lines
10 KiB
C
450 lines
10 KiB
C
/*
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* Copyright 2017 Red Hat
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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 "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* 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 NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Authors:
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*
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*/
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/**
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* DOC: Overview
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*
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* DRM synchronisation objects (syncobj) are a persistent objects,
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* that contain an optional fence. The fence can be updated with a new
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* fence, or be NULL.
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*
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* syncobj's can be export to fd's and back, these fd's are opaque and
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* have no other use case, except passing the syncobj between processes.
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*
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* Their primary use-case is to implement Vulkan fences and semaphores.
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*
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* syncobj have a kref reference count, but also have an optional file.
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* The file is only created once the syncobj is exported.
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* The file takes a reference on the kref.
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*/
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#include <drm/drmP.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/anon_inodes.h>
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#include <linux/sync_file.h>
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#include "drm_internal.h"
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#include <drm/drm_syncobj.h>
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/**
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* drm_syncobj_find - lookup and reference a sync object.
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* @file_private: drm file private pointer
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* @handle: sync object handle to lookup.
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*
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* Returns a reference to the syncobj pointed to by handle or NULL.
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*/
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struct drm_syncobj *drm_syncobj_find(struct drm_file *file_private,
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u32 handle)
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{
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struct drm_syncobj *syncobj;
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spin_lock(&file_private->syncobj_table_lock);
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/* Check if we currently have a reference on the object */
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syncobj = idr_find(&file_private->syncobj_idr, handle);
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if (syncobj)
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drm_syncobj_get(syncobj);
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spin_unlock(&file_private->syncobj_table_lock);
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return syncobj;
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}
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EXPORT_SYMBOL(drm_syncobj_find);
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/**
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* drm_syncobj_replace_fence - replace fence in a sync object.
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* @syncobj: Sync object to replace fence in
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* @fence: fence to install in sync file.
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*
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* This replaces the fence on a sync object.
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*/
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void drm_syncobj_replace_fence(struct drm_syncobj *syncobj,
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struct dma_fence *fence)
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{
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struct dma_fence *old_fence;
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if (fence)
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dma_fence_get(fence);
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old_fence = xchg(&syncobj->fence, fence);
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dma_fence_put(old_fence);
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}
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EXPORT_SYMBOL(drm_syncobj_replace_fence);
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int drm_syncobj_fence_get(struct drm_file *file_private,
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u32 handle,
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struct dma_fence **fence)
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{
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struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle);
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int ret = 0;
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if (!syncobj)
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return -ENOENT;
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*fence = dma_fence_get(syncobj->fence);
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if (!*fence) {
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ret = -EINVAL;
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}
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drm_syncobj_put(syncobj);
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return ret;
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}
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EXPORT_SYMBOL(drm_syncobj_fence_get);
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/**
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* drm_syncobj_free - free a sync object.
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* @kref: kref to free.
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*
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* Only to be called from kref_put in drm_syncobj_put.
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*/
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void drm_syncobj_free(struct kref *kref)
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{
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struct drm_syncobj *syncobj = container_of(kref,
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struct drm_syncobj,
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refcount);
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dma_fence_put(syncobj->fence);
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kfree(syncobj);
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}
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EXPORT_SYMBOL(drm_syncobj_free);
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static int drm_syncobj_create(struct drm_file *file_private,
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u32 *handle)
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{
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int ret;
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struct drm_syncobj *syncobj;
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syncobj = kzalloc(sizeof(struct drm_syncobj), GFP_KERNEL);
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if (!syncobj)
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return -ENOMEM;
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kref_init(&syncobj->refcount);
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idr_preload(GFP_KERNEL);
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spin_lock(&file_private->syncobj_table_lock);
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ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_NOWAIT);
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spin_unlock(&file_private->syncobj_table_lock);
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idr_preload_end();
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if (ret < 0) {
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drm_syncobj_put(syncobj);
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return ret;
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}
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*handle = ret;
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return 0;
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}
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static int drm_syncobj_destroy(struct drm_file *file_private,
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u32 handle)
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{
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struct drm_syncobj *syncobj;
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spin_lock(&file_private->syncobj_table_lock);
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syncobj = idr_remove(&file_private->syncobj_idr, handle);
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spin_unlock(&file_private->syncobj_table_lock);
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if (!syncobj)
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return -EINVAL;
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drm_syncobj_put(syncobj);
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return 0;
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}
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static int drm_syncobj_file_release(struct inode *inode, struct file *file)
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{
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struct drm_syncobj *syncobj = file->private_data;
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drm_syncobj_put(syncobj);
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return 0;
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}
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static const struct file_operations drm_syncobj_file_fops = {
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.release = drm_syncobj_file_release,
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};
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static int drm_syncobj_alloc_file(struct drm_syncobj *syncobj)
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{
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struct file *file = anon_inode_getfile("syncobj_file",
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&drm_syncobj_file_fops,
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syncobj, 0);
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if (IS_ERR(file))
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return PTR_ERR(file);
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drm_syncobj_get(syncobj);
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if (cmpxchg(&syncobj->file, NULL, file)) {
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/* lost the race */
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fput(file);
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}
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return 0;
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}
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static int drm_syncobj_handle_to_fd(struct drm_file *file_private,
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u32 handle, int *p_fd)
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{
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struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle);
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int ret;
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int fd;
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if (!syncobj)
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return -EINVAL;
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fd = get_unused_fd_flags(O_CLOEXEC);
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if (fd < 0) {
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drm_syncobj_put(syncobj);
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return fd;
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}
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if (!syncobj->file) {
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ret = drm_syncobj_alloc_file(syncobj);
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if (ret)
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goto out_put_fd;
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}
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fd_install(fd, syncobj->file);
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drm_syncobj_put(syncobj);
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*p_fd = fd;
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return 0;
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out_put_fd:
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put_unused_fd(fd);
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drm_syncobj_put(syncobj);
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return ret;
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}
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static struct drm_syncobj *drm_syncobj_fdget(int fd)
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{
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struct file *file = fget(fd);
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if (!file)
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return NULL;
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if (file->f_op != &drm_syncobj_file_fops)
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goto err;
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return file->private_data;
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err:
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fput(file);
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return NULL;
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};
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static int drm_syncobj_fd_to_handle(struct drm_file *file_private,
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int fd, u32 *handle)
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{
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struct drm_syncobj *syncobj = drm_syncobj_fdget(fd);
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int ret;
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if (!syncobj)
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return -EINVAL;
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/* take a reference to put in the idr */
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drm_syncobj_get(syncobj);
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idr_preload(GFP_KERNEL);
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spin_lock(&file_private->syncobj_table_lock);
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ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_NOWAIT);
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spin_unlock(&file_private->syncobj_table_lock);
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idr_preload_end();
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if (ret < 0) {
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fput(syncobj->file);
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return ret;
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}
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*handle = ret;
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return 0;
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}
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int drm_syncobj_import_sync_file_fence(struct drm_file *file_private,
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int fd, int handle)
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{
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struct dma_fence *fence = sync_file_get_fence(fd);
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struct drm_syncobj *syncobj;
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if (!fence)
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return -EINVAL;
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syncobj = drm_syncobj_find(file_private, handle);
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if (!syncobj) {
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dma_fence_put(fence);
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return -ENOENT;
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}
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drm_syncobj_replace_fence(syncobj, fence);
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dma_fence_put(fence);
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drm_syncobj_put(syncobj);
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return 0;
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}
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int drm_syncobj_export_sync_file(struct drm_file *file_private,
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int handle, int *p_fd)
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{
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int ret;
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struct dma_fence *fence;
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struct sync_file *sync_file;
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int fd = get_unused_fd_flags(O_CLOEXEC);
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if (fd < 0)
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return fd;
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ret = drm_syncobj_fence_get(file_private, handle, &fence);
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if (ret)
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goto err_put_fd;
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sync_file = sync_file_create(fence);
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dma_fence_put(fence);
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if (!sync_file) {
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ret = -EINVAL;
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goto err_put_fd;
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}
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fd_install(fd, sync_file->file);
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*p_fd = fd;
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return 0;
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err_put_fd:
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put_unused_fd(fd);
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return ret;
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}
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/**
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* drm_syncobj_open - initalizes syncobj file-private structures at devnode open time
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* @file_private: drm file-private structure to set up
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*
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* Called at device open time, sets up the structure for handling refcounting
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* of sync objects.
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*/
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void
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drm_syncobj_open(struct drm_file *file_private)
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{
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idr_init(&file_private->syncobj_idr);
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spin_lock_init(&file_private->syncobj_table_lock);
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}
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static int
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drm_syncobj_release_handle(int id, void *ptr, void *data)
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{
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struct drm_syncobj *syncobj = ptr;
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drm_syncobj_put(syncobj);
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return 0;
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}
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/**
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* drm_syncobj_release - release file-private sync object resources
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* @file_private: drm file-private structure to clean up
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*
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* Called at close time when the filp is going away.
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*
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* Releases any remaining references on objects by this filp.
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*/
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void
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drm_syncobj_release(struct drm_file *file_private)
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{
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idr_for_each(&file_private->syncobj_idr,
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&drm_syncobj_release_handle, file_private);
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idr_destroy(&file_private->syncobj_idr);
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}
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int
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drm_syncobj_create_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_private)
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{
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struct drm_syncobj_create *args = data;
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if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
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return -ENODEV;
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/* no valid flags yet */
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if (args->flags)
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return -EINVAL;
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return drm_syncobj_create(file_private,
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&args->handle);
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}
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int
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drm_syncobj_destroy_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_private)
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{
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struct drm_syncobj_destroy *args = data;
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if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
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return -ENODEV;
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/* make sure padding is empty */
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if (args->pad)
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return -EINVAL;
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return drm_syncobj_destroy(file_private, args->handle);
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}
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int
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drm_syncobj_handle_to_fd_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_private)
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{
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struct drm_syncobj_handle *args = data;
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if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
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return -ENODEV;
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if (args->pad)
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return -EINVAL;
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if (args->flags != 0 &&
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args->flags != DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE)
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return -EINVAL;
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if (args->flags & DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE)
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return drm_syncobj_export_sync_file(file_private, args->handle,
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&args->fd);
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return drm_syncobj_handle_to_fd(file_private, args->handle,
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&args->fd);
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}
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int
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drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_private)
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{
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struct drm_syncobj_handle *args = data;
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if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
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return -ENODEV;
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if (args->pad)
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return -EINVAL;
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if (args->flags != 0 &&
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args->flags != DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE)
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return -EINVAL;
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if (args->flags & DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE)
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return drm_syncobj_import_sync_file_fence(file_private,
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args->fd,
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args->handle);
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return drm_syncobj_fd_to_handle(file_private, args->fd,
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&args->handle);
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}
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