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![Gustavo Padovan](/assets/img/avatar_default.png)
Christian König changed fence context to a u64 type, so we need to update all users accordingly. Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk> Acked-by: Sumit Semwal <sumit.semwal@linaro.org> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1464968791-4564-1-git-send-email-gustavo@padovan.org
395 lines
9.1 KiB
C
395 lines
9.1 KiB
C
/*
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* drivers/dma-buf/sync_file.c
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*
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* Copyright (C) 2012 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/export.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/poll.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/anon_inodes.h>
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#include <linux/sync_file.h>
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#include <uapi/linux/sync_file.h>
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static const struct file_operations sync_file_fops;
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static struct sync_file *sync_file_alloc(int size)
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{
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struct sync_file *sync_file;
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sync_file = kzalloc(size, GFP_KERNEL);
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if (!sync_file)
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return NULL;
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sync_file->file = anon_inode_getfile("sync_file", &sync_file_fops,
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sync_file, 0);
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if (IS_ERR(sync_file->file))
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goto err;
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kref_init(&sync_file->kref);
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init_waitqueue_head(&sync_file->wq);
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return sync_file;
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err:
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kfree(sync_file);
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return NULL;
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}
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static void fence_check_cb_func(struct fence *f, struct fence_cb *cb)
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{
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struct sync_file_cb *check;
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struct sync_file *sync_file;
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check = container_of(cb, struct sync_file_cb, cb);
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sync_file = check->sync_file;
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if (atomic_dec_and_test(&sync_file->status))
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wake_up_all(&sync_file->wq);
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}
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/**
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* sync_file_create() - creates a sync file
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* @fence: fence to add to the sync_fence
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*
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* Creates a sync_file containg @fence. Once this is called, the sync_file
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* takes ownership of @fence. The sync_file can be released with
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* fput(sync_file->file). Returns the sync_file or NULL in case of error.
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*/
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struct sync_file *sync_file_create(struct fence *fence)
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{
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struct sync_file *sync_file;
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sync_file = sync_file_alloc(offsetof(struct sync_file, cbs[1]));
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if (!sync_file)
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return NULL;
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sync_file->num_fences = 1;
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atomic_set(&sync_file->status, 1);
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snprintf(sync_file->name, sizeof(sync_file->name), "%s-%s%llu-%d",
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fence->ops->get_driver_name(fence),
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fence->ops->get_timeline_name(fence), fence->context,
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fence->seqno);
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sync_file->cbs[0].fence = fence;
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sync_file->cbs[0].sync_file = sync_file;
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if (fence_add_callback(fence, &sync_file->cbs[0].cb,
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fence_check_cb_func))
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atomic_dec(&sync_file->status);
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return sync_file;
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}
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EXPORT_SYMBOL(sync_file_create);
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/**
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* sync_file_fdget() - get a sync_file from an fd
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* @fd: fd referencing a fence
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*
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* Ensures @fd references a valid sync_file, increments the refcount of the
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* backing file. Returns the sync_file or NULL in case of error.
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*/
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static struct sync_file *sync_file_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 != &sync_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 void sync_file_add_pt(struct sync_file *sync_file, int *i,
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struct fence *fence)
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{
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sync_file->cbs[*i].fence = fence;
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sync_file->cbs[*i].sync_file = sync_file;
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if (!fence_add_callback(fence, &sync_file->cbs[*i].cb,
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fence_check_cb_func)) {
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fence_get(fence);
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(*i)++;
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}
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}
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/**
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* sync_file_merge() - merge two sync_files
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* @name: name of new fence
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* @a: sync_file a
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* @b: sync_file b
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*
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* Creates a new sync_file which contains copies of all the fences in both
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* @a and @b. @a and @b remain valid, independent sync_file. Returns the
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* new merged sync_file or NULL in case of error.
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*/
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static struct sync_file *sync_file_merge(const char *name, struct sync_file *a,
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struct sync_file *b)
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{
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int num_fences = a->num_fences + b->num_fences;
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struct sync_file *sync_file;
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int i, i_a, i_b;
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unsigned long size = offsetof(struct sync_file, cbs[num_fences]);
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sync_file = sync_file_alloc(size);
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if (!sync_file)
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return NULL;
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atomic_set(&sync_file->status, num_fences);
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/*
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* Assume sync_file a and b are both ordered and have no
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* duplicates with the same context.
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*
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* If a sync_file can only be created with sync_file_merge
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* and sync_file_create, this is a reasonable assumption.
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*/
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for (i = i_a = i_b = 0; i_a < a->num_fences && i_b < b->num_fences; ) {
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struct fence *pt_a = a->cbs[i_a].fence;
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struct fence *pt_b = b->cbs[i_b].fence;
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if (pt_a->context < pt_b->context) {
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sync_file_add_pt(sync_file, &i, pt_a);
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i_a++;
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} else if (pt_a->context > pt_b->context) {
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sync_file_add_pt(sync_file, &i, pt_b);
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i_b++;
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} else {
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if (pt_a->seqno - pt_b->seqno <= INT_MAX)
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sync_file_add_pt(sync_file, &i, pt_a);
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else
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sync_file_add_pt(sync_file, &i, pt_b);
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i_a++;
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i_b++;
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}
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}
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for (; i_a < a->num_fences; i_a++)
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sync_file_add_pt(sync_file, &i, a->cbs[i_a].fence);
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for (; i_b < b->num_fences; i_b++)
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sync_file_add_pt(sync_file, &i, b->cbs[i_b].fence);
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if (num_fences > i)
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atomic_sub(num_fences - i, &sync_file->status);
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sync_file->num_fences = i;
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strlcpy(sync_file->name, name, sizeof(sync_file->name));
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return sync_file;
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}
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static void sync_file_free(struct kref *kref)
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{
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struct sync_file *sync_file = container_of(kref, struct sync_file,
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kref);
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int i;
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for (i = 0; i < sync_file->num_fences; ++i) {
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fence_remove_callback(sync_file->cbs[i].fence,
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&sync_file->cbs[i].cb);
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fence_put(sync_file->cbs[i].fence);
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}
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kfree(sync_file);
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}
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static int sync_file_release(struct inode *inode, struct file *file)
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{
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struct sync_file *sync_file = file->private_data;
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kref_put(&sync_file->kref, sync_file_free);
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return 0;
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}
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static unsigned int sync_file_poll(struct file *file, poll_table *wait)
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{
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struct sync_file *sync_file = file->private_data;
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int status;
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poll_wait(file, &sync_file->wq, wait);
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status = atomic_read(&sync_file->status);
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if (!status)
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return POLLIN;
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if (status < 0)
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return POLLERR;
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return 0;
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}
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static long sync_file_ioctl_merge(struct sync_file *sync_file,
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unsigned long arg)
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{
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int fd = get_unused_fd_flags(O_CLOEXEC);
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int err;
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struct sync_file *fence2, *fence3;
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struct sync_merge_data data;
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if (fd < 0)
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return fd;
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if (copy_from_user(&data, (void __user *)arg, sizeof(data))) {
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err = -EFAULT;
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goto err_put_fd;
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}
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if (data.flags || data.pad) {
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err = -EINVAL;
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goto err_put_fd;
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}
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fence2 = sync_file_fdget(data.fd2);
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if (!fence2) {
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err = -ENOENT;
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goto err_put_fd;
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}
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data.name[sizeof(data.name) - 1] = '\0';
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fence3 = sync_file_merge(data.name, sync_file, fence2);
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if (!fence3) {
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err = -ENOMEM;
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goto err_put_fence2;
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}
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data.fence = fd;
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if (copy_to_user((void __user *)arg, &data, sizeof(data))) {
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err = -EFAULT;
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goto err_put_fence3;
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}
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fd_install(fd, fence3->file);
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fput(fence2->file);
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return 0;
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err_put_fence3:
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fput(fence3->file);
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err_put_fence2:
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fput(fence2->file);
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err_put_fd:
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put_unused_fd(fd);
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return err;
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}
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static void sync_fill_fence_info(struct fence *fence,
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struct sync_fence_info *info)
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{
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strlcpy(info->obj_name, fence->ops->get_timeline_name(fence),
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sizeof(info->obj_name));
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strlcpy(info->driver_name, fence->ops->get_driver_name(fence),
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sizeof(info->driver_name));
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if (fence_is_signaled(fence))
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info->status = fence->status >= 0 ? 1 : fence->status;
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else
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info->status = 0;
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info->timestamp_ns = ktime_to_ns(fence->timestamp);
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}
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static long sync_file_ioctl_fence_info(struct sync_file *sync_file,
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unsigned long arg)
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{
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struct sync_file_info info;
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struct sync_fence_info *fence_info = NULL;
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__u32 size;
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int ret, i;
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if (copy_from_user(&info, (void __user *)arg, sizeof(info)))
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return -EFAULT;
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if (info.flags || info.pad)
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return -EINVAL;
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/*
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* Passing num_fences = 0 means that userspace doesn't want to
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* retrieve any sync_fence_info. If num_fences = 0 we skip filling
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* sync_fence_info and return the actual number of fences on
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* info->num_fences.
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*/
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if (!info.num_fences)
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goto no_fences;
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if (info.num_fences < sync_file->num_fences)
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return -EINVAL;
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size = sync_file->num_fences * sizeof(*fence_info);
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fence_info = kzalloc(size, GFP_KERNEL);
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if (!fence_info)
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return -ENOMEM;
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for (i = 0; i < sync_file->num_fences; ++i)
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sync_fill_fence_info(sync_file->cbs[i].fence, &fence_info[i]);
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if (copy_to_user(u64_to_user_ptr(info.sync_fence_info), fence_info,
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size)) {
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ret = -EFAULT;
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goto out;
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}
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no_fences:
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strlcpy(info.name, sync_file->name, sizeof(info.name));
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info.status = atomic_read(&sync_file->status);
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if (info.status >= 0)
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info.status = !info.status;
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info.num_fences = sync_file->num_fences;
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if (copy_to_user((void __user *)arg, &info, sizeof(info)))
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ret = -EFAULT;
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else
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ret = 0;
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out:
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kfree(fence_info);
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return ret;
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}
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static long sync_file_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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struct sync_file *sync_file = file->private_data;
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switch (cmd) {
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case SYNC_IOC_MERGE:
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return sync_file_ioctl_merge(sync_file, arg);
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case SYNC_IOC_FILE_INFO:
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return sync_file_ioctl_fence_info(sync_file, arg);
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default:
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return -ENOTTY;
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}
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}
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static const struct file_operations sync_file_fops = {
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.release = sync_file_release,
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.poll = sync_file_poll,
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.unlocked_ioctl = sync_file_ioctl,
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.compat_ioctl = sync_file_ioctl,
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};
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