mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Christian König](/assets/img/avatar_default.png)
Introduce a dma_fence_unwrap_merge() macro which allows to unwrap fences which potentially can be containers as well and then merge them back together into a flat dma_fence_array. v2: rename the function, add some more comments about how the wrapper is used, move filtering of signaled fences into the unwrap iterator, add complex selftest which covers more cases. v3: fix signaled fence filtering once more Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20220518135844.3338-5-christian.koenig@amd.com
375 lines
8.5 KiB
C
375 lines
8.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* drivers/dma-buf/sync_file.c
|
|
*
|
|
* Copyright (C) 2012 Google, Inc.
|
|
*/
|
|
|
|
#include <linux/dma-fence-unwrap.h>
|
|
#include <linux/export.h>
|
|
#include <linux/file.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/poll.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/anon_inodes.h>
|
|
#include <linux/sync_file.h>
|
|
#include <uapi/linux/sync_file.h>
|
|
|
|
static const struct file_operations sync_file_fops;
|
|
|
|
static struct sync_file *sync_file_alloc(void)
|
|
{
|
|
struct sync_file *sync_file;
|
|
|
|
sync_file = kzalloc(sizeof(*sync_file), GFP_KERNEL);
|
|
if (!sync_file)
|
|
return NULL;
|
|
|
|
sync_file->file = anon_inode_getfile("sync_file", &sync_file_fops,
|
|
sync_file, 0);
|
|
if (IS_ERR(sync_file->file))
|
|
goto err;
|
|
|
|
init_waitqueue_head(&sync_file->wq);
|
|
|
|
INIT_LIST_HEAD(&sync_file->cb.node);
|
|
|
|
return sync_file;
|
|
|
|
err:
|
|
kfree(sync_file);
|
|
return NULL;
|
|
}
|
|
|
|
static void fence_check_cb_func(struct dma_fence *f, struct dma_fence_cb *cb)
|
|
{
|
|
struct sync_file *sync_file;
|
|
|
|
sync_file = container_of(cb, struct sync_file, cb);
|
|
|
|
wake_up_all(&sync_file->wq);
|
|
}
|
|
|
|
/**
|
|
* sync_file_create() - creates a sync file
|
|
* @fence: fence to add to the sync_fence
|
|
*
|
|
* Creates a sync_file containg @fence. This function acquires and additional
|
|
* reference of @fence for the newly-created &sync_file, if it succeeds. The
|
|
* sync_file can be released with fput(sync_file->file). Returns the
|
|
* sync_file or NULL in case of error.
|
|
*/
|
|
struct sync_file *sync_file_create(struct dma_fence *fence)
|
|
{
|
|
struct sync_file *sync_file;
|
|
|
|
sync_file = sync_file_alloc();
|
|
if (!sync_file)
|
|
return NULL;
|
|
|
|
sync_file->fence = dma_fence_get(fence);
|
|
|
|
return sync_file;
|
|
}
|
|
EXPORT_SYMBOL(sync_file_create);
|
|
|
|
static struct sync_file *sync_file_fdget(int fd)
|
|
{
|
|
struct file *file = fget(fd);
|
|
|
|
if (!file)
|
|
return NULL;
|
|
|
|
if (file->f_op != &sync_file_fops)
|
|
goto err;
|
|
|
|
return file->private_data;
|
|
|
|
err:
|
|
fput(file);
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* sync_file_get_fence - get the fence related to the sync_file fd
|
|
* @fd: sync_file fd to get the fence from
|
|
*
|
|
* Ensures @fd references a valid sync_file and returns a fence that
|
|
* represents all fence in the sync_file. On error NULL is returned.
|
|
*/
|
|
struct dma_fence *sync_file_get_fence(int fd)
|
|
{
|
|
struct sync_file *sync_file;
|
|
struct dma_fence *fence;
|
|
|
|
sync_file = sync_file_fdget(fd);
|
|
if (!sync_file)
|
|
return NULL;
|
|
|
|
fence = dma_fence_get(sync_file->fence);
|
|
fput(sync_file->file);
|
|
|
|
return fence;
|
|
}
|
|
EXPORT_SYMBOL(sync_file_get_fence);
|
|
|
|
/**
|
|
* sync_file_get_name - get the name of the sync_file
|
|
* @sync_file: sync_file to get the fence from
|
|
* @buf: destination buffer to copy sync_file name into
|
|
* @len: available size of destination buffer.
|
|
*
|
|
* Each sync_file may have a name assigned either by the user (when merging
|
|
* sync_files together) or created from the fence it contains. In the latter
|
|
* case construction of the name is deferred until use, and so requires
|
|
* sync_file_get_name().
|
|
*
|
|
* Returns: a string representing the name.
|
|
*/
|
|
char *sync_file_get_name(struct sync_file *sync_file, char *buf, int len)
|
|
{
|
|
if (sync_file->user_name[0]) {
|
|
strlcpy(buf, sync_file->user_name, len);
|
|
} else {
|
|
struct dma_fence *fence = sync_file->fence;
|
|
|
|
snprintf(buf, len, "%s-%s%llu-%lld",
|
|
fence->ops->get_driver_name(fence),
|
|
fence->ops->get_timeline_name(fence),
|
|
fence->context,
|
|
fence->seqno);
|
|
}
|
|
|
|
return buf;
|
|
}
|
|
|
|
/**
|
|
* sync_file_merge() - merge two sync_files
|
|
* @name: name of new fence
|
|
* @a: sync_file a
|
|
* @b: sync_file b
|
|
*
|
|
* Creates a new sync_file which contains copies of all the fences in both
|
|
* @a and @b. @a and @b remain valid, independent sync_file. Returns the
|
|
* new merged sync_file or NULL in case of error.
|
|
*/
|
|
static struct sync_file *sync_file_merge(const char *name, struct sync_file *a,
|
|
struct sync_file *b)
|
|
{
|
|
struct sync_file *sync_file;
|
|
struct dma_fence *fence;
|
|
|
|
sync_file = sync_file_alloc();
|
|
if (!sync_file)
|
|
return NULL;
|
|
|
|
fence = dma_fence_unwrap_merge(a->fence, b->fence);
|
|
if (!fence) {
|
|
fput(sync_file->file);
|
|
return NULL;
|
|
}
|
|
sync_file->fence = fence;
|
|
strlcpy(sync_file->user_name, name, sizeof(sync_file->user_name));
|
|
return sync_file;
|
|
}
|
|
|
|
static int sync_file_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct sync_file *sync_file = file->private_data;
|
|
|
|
if (test_bit(POLL_ENABLED, &sync_file->flags))
|
|
dma_fence_remove_callback(sync_file->fence, &sync_file->cb);
|
|
dma_fence_put(sync_file->fence);
|
|
kfree(sync_file);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static __poll_t sync_file_poll(struct file *file, poll_table *wait)
|
|
{
|
|
struct sync_file *sync_file = file->private_data;
|
|
|
|
poll_wait(file, &sync_file->wq, wait);
|
|
|
|
if (list_empty(&sync_file->cb.node) &&
|
|
!test_and_set_bit(POLL_ENABLED, &sync_file->flags)) {
|
|
if (dma_fence_add_callback(sync_file->fence, &sync_file->cb,
|
|
fence_check_cb_func) < 0)
|
|
wake_up_all(&sync_file->wq);
|
|
}
|
|
|
|
return dma_fence_is_signaled(sync_file->fence) ? EPOLLIN : 0;
|
|
}
|
|
|
|
static long sync_file_ioctl_merge(struct sync_file *sync_file,
|
|
unsigned long arg)
|
|
{
|
|
int fd = get_unused_fd_flags(O_CLOEXEC);
|
|
int err;
|
|
struct sync_file *fence2, *fence3;
|
|
struct sync_merge_data data;
|
|
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
if (copy_from_user(&data, (void __user *)arg, sizeof(data))) {
|
|
err = -EFAULT;
|
|
goto err_put_fd;
|
|
}
|
|
|
|
if (data.flags || data.pad) {
|
|
err = -EINVAL;
|
|
goto err_put_fd;
|
|
}
|
|
|
|
fence2 = sync_file_fdget(data.fd2);
|
|
if (!fence2) {
|
|
err = -ENOENT;
|
|
goto err_put_fd;
|
|
}
|
|
|
|
data.name[sizeof(data.name) - 1] = '\0';
|
|
fence3 = sync_file_merge(data.name, sync_file, fence2);
|
|
if (!fence3) {
|
|
err = -ENOMEM;
|
|
goto err_put_fence2;
|
|
}
|
|
|
|
data.fence = fd;
|
|
if (copy_to_user((void __user *)arg, &data, sizeof(data))) {
|
|
err = -EFAULT;
|
|
goto err_put_fence3;
|
|
}
|
|
|
|
fd_install(fd, fence3->file);
|
|
fput(fence2->file);
|
|
return 0;
|
|
|
|
err_put_fence3:
|
|
fput(fence3->file);
|
|
|
|
err_put_fence2:
|
|
fput(fence2->file);
|
|
|
|
err_put_fd:
|
|
put_unused_fd(fd);
|
|
return err;
|
|
}
|
|
|
|
static int sync_fill_fence_info(struct dma_fence *fence,
|
|
struct sync_fence_info *info)
|
|
{
|
|
strlcpy(info->obj_name, fence->ops->get_timeline_name(fence),
|
|
sizeof(info->obj_name));
|
|
strlcpy(info->driver_name, fence->ops->get_driver_name(fence),
|
|
sizeof(info->driver_name));
|
|
|
|
info->status = dma_fence_get_status(fence);
|
|
while (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags) &&
|
|
!test_bit(DMA_FENCE_FLAG_TIMESTAMP_BIT, &fence->flags))
|
|
cpu_relax();
|
|
info->timestamp_ns =
|
|
test_bit(DMA_FENCE_FLAG_TIMESTAMP_BIT, &fence->flags) ?
|
|
ktime_to_ns(fence->timestamp) :
|
|
ktime_set(0, 0);
|
|
|
|
return info->status;
|
|
}
|
|
|
|
static long sync_file_ioctl_fence_info(struct sync_file *sync_file,
|
|
unsigned long arg)
|
|
{
|
|
struct sync_fence_info *fence_info = NULL;
|
|
struct dma_fence_unwrap iter;
|
|
struct sync_file_info info;
|
|
unsigned int num_fences;
|
|
struct dma_fence *fence;
|
|
int ret;
|
|
__u32 size;
|
|
|
|
if (copy_from_user(&info, (void __user *)arg, sizeof(info)))
|
|
return -EFAULT;
|
|
|
|
if (info.flags || info.pad)
|
|
return -EINVAL;
|
|
|
|
num_fences = 0;
|
|
dma_fence_unwrap_for_each(fence, &iter, sync_file->fence)
|
|
++num_fences;
|
|
|
|
/*
|
|
* Passing num_fences = 0 means that userspace doesn't want to
|
|
* retrieve any sync_fence_info. If num_fences = 0 we skip filling
|
|
* sync_fence_info and return the actual number of fences on
|
|
* info->num_fences.
|
|
*/
|
|
if (!info.num_fences) {
|
|
info.status = dma_fence_get_status(sync_file->fence);
|
|
goto no_fences;
|
|
} else {
|
|
info.status = 1;
|
|
}
|
|
|
|
if (info.num_fences < num_fences)
|
|
return -EINVAL;
|
|
|
|
size = num_fences * sizeof(*fence_info);
|
|
fence_info = kzalloc(size, GFP_KERNEL);
|
|
if (!fence_info)
|
|
return -ENOMEM;
|
|
|
|
num_fences = 0;
|
|
dma_fence_unwrap_for_each(fence, &iter, sync_file->fence) {
|
|
int status;
|
|
|
|
status = sync_fill_fence_info(fence, &fence_info[num_fences++]);
|
|
info.status = info.status <= 0 ? info.status : status;
|
|
}
|
|
|
|
if (copy_to_user(u64_to_user_ptr(info.sync_fence_info), fence_info,
|
|
size)) {
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
no_fences:
|
|
sync_file_get_name(sync_file, info.name, sizeof(info.name));
|
|
info.num_fences = num_fences;
|
|
|
|
if (copy_to_user((void __user *)arg, &info, sizeof(info)))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = 0;
|
|
|
|
out:
|
|
kfree(fence_info);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static long sync_file_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct sync_file *sync_file = file->private_data;
|
|
|
|
switch (cmd) {
|
|
case SYNC_IOC_MERGE:
|
|
return sync_file_ioctl_merge(sync_file, arg);
|
|
|
|
case SYNC_IOC_FILE_INFO:
|
|
return sync_file_ioctl_fence_info(sync_file, arg);
|
|
|
|
default:
|
|
return -ENOTTY;
|
|
}
|
|
}
|
|
|
|
static const struct file_operations sync_file_fops = {
|
|
.release = sync_file_release,
|
|
.poll = sync_file_poll,
|
|
.unlocked_ioctl = sync_file_ioctl,
|
|
.compat_ioctl = compat_ptr_ioctl,
|
|
};
|