dma-buf/sync_file: de-stage sync_file

sync_file is useful to connect one or more fences to the file. The file is
used by userspace to track fences between drivers that share DMA bufs.

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 2 insertions, 396 deletions

diff --git a/drivers/staging/android/Kconfig b/drivers/staging/android/Kconfig
index 68042ab..6480f60 100644
--- a/drivers/staging/android/Kconfig
+++ b/drivers/staging/android/Kconfig
@@ -38,6 +38,7 @@ config SW_SYNC
 	bool "Software synchronization objects"
 	default n
 	depends on SYNC
+	depends on SYNC_FILE
 	---help---
 	  A sync object driver that uses a 32bit counter to coordinate
 	  synchronization.  Useful when there is no hardware primitive backing
diff --git a/drivers/staging/android/Makefile b/drivers/staging/android/Makefile
index ebc2df1..980d6dc 100644
--- a/drivers/staging/android/Makefile
+++ b/drivers/staging/android/Makefile
@@ -4,5 +4,5 @@ obj-y					+= ion/
 
 obj-$(CONFIG_ASHMEM)			+= ashmem.o
 obj-$(CONFIG_ANDROID_LOW_MEMORY_KILLER)	+= lowmemorykiller.o
-obj-$(CONFIG_SYNC)			+= sync_file.o sync.o sync_debug.o
+obj-$(CONFIG_SYNC)			+= sync.o sync_debug.o
 obj-$(CONFIG_SW_SYNC)			+= sw_sync.o
diff --git a/drivers/staging/android/sync_file.c b/drivers/staging/android/sync_file.c
deleted file mode 100644
index f08cf2d..0000000
--- a/drivers/staging/android/sync_file.c
+++ /dev/null
@@ -1,395 +0,0 @@
-/*
- * drivers/dma-buf/sync_file.c
- *
- * Copyright (C) 2012 Google, Inc.
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- */
-
-#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(int size)
-{
-	struct sync_file *sync_file;
-
-	sync_file = kzalloc(size, 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;
-
-	kref_init(&sync_file->kref);
-
-	init_waitqueue_head(&sync_file->wq);
-
-	return sync_file;
-
-err:
-	kfree(sync_file);
-	return NULL;
-}
-
-static void fence_check_cb_func(struct fence *f, struct fence_cb *cb)
-{
-	struct sync_file_cb *check;
-	struct sync_file *sync_file;
-
-	check = container_of(cb, struct sync_file_cb, cb);
-	sync_file = check->sync_file;
-
-	if (atomic_dec_and_test(&sync_file->status))
-		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. Once this is called, the sync_file
- * takes ownership of @fence. 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 fence *fence)
-{
-	struct sync_file *sync_file;
-
-	sync_file = sync_file_alloc(offsetof(struct sync_file, cbs[1]));
-	if (!sync_file)
-		return NULL;
-
-	sync_file->num_fences = 1;
-	atomic_set(&sync_file->status, 1);
-	snprintf(sync_file->name, sizeof(sync_file->name), "%s-%s%d-%d",
-		 fence->ops->get_driver_name(fence),
-		 fence->ops->get_timeline_name(fence), fence->context,
-		 fence->seqno);
-
-	sync_file->cbs[0].fence = fence;
-	sync_file->cbs[0].sync_file = sync_file;
-	if (fence_add_callback(fence, &sync_file->cbs[0].cb,
-			       fence_check_cb_func))
-		atomic_dec(&sync_file->status);
-
-	return sync_file;
-}
-EXPORT_SYMBOL(sync_file_create);
-
-/**
- * sync_file_fdget() - get a sync_file from an fd
- * @fd:		fd referencing a fence
- *
- * Ensures @fd references a valid sync_file, increments the refcount of the
- * backing file. Returns the sync_file or NULL in case of error.
- */
-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;
-}
-
-static void sync_file_add_pt(struct sync_file *sync_file, int *i,
-			     struct fence *fence)
-{
-	sync_file->cbs[*i].fence = fence;
-	sync_file->cbs[*i].sync_file = sync_file;
-
-	if (!fence_add_callback(fence, &sync_file->cbs[*i].cb,
-				fence_check_cb_func)) {
-		fence_get(fence);
-		(*i)++;
-	}
-}
-
-/**
- * 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)
-{
-	int num_fences = a->num_fences + b->num_fences;
-	struct sync_file *sync_file;
-	int i, i_a, i_b;
-	unsigned long size = offsetof(struct sync_file, cbs[num_fences]);
-
-	sync_file = sync_file_alloc(size);
-	if (!sync_file)
-		return NULL;
-
-	atomic_set(&sync_file->status, num_fences);
-
-	/*
-	 * Assume sync_file a and b are both ordered and have no
-	 * duplicates with the same context.
-	 *
-	 * If a sync_file can only be created with sync_file_merge
-	 * and sync_file_create, this is a reasonable assumption.
-	 */
-	for (i = i_a = i_b = 0; i_a < a->num_fences && i_b < b->num_fences; ) {
-		struct fence *pt_a = a->cbs[i_a].fence;
-		struct fence *pt_b = b->cbs[i_b].fence;
-
-		if (pt_a->context < pt_b->context) {
-			sync_file_add_pt(sync_file, &i, pt_a);
-
-			i_a++;
-		} else if (pt_a->context > pt_b->context) {
-			sync_file_add_pt(sync_file, &i, pt_b);
-
-			i_b++;
-		} else {
-			if (pt_a->seqno - pt_b->seqno <= INT_MAX)
-				sync_file_add_pt(sync_file, &i, pt_a);
-			else
-				sync_file_add_pt(sync_file, &i, pt_b);
-
-			i_a++;
-			i_b++;
-		}
-	}
-
-	for (; i_a < a->num_fences; i_a++)
-		sync_file_add_pt(sync_file, &i, a->cbs[i_a].fence);
-
-	for (; i_b < b->num_fences; i_b++)
-		sync_file_add_pt(sync_file, &i, b->cbs[i_b].fence);
-
-	if (num_fences > i)
-		atomic_sub(num_fences - i, &sync_file->status);
-	sync_file->num_fences = i;
-
-	strlcpy(sync_file->name, name, sizeof(sync_file->name));
-	return sync_file;
-}
-
-static void sync_file_free(struct kref *kref)
-{
-	struct sync_file *sync_file = container_of(kref, struct sync_file,
-						     kref);
-	int i;
-
-	for (i = 0; i < sync_file->num_fences; ++i) {
-		fence_remove_callback(sync_file->cbs[i].fence,
-				      &sync_file->cbs[i].cb);
-		fence_put(sync_file->cbs[i].fence);
-	}
-
-	kfree(sync_file);
-}
-
-static int sync_file_release(struct inode *inode, struct file *file)
-{
-	struct sync_file *sync_file = file->private_data;
-
-	kref_put(&sync_file->kref, sync_file_free);
-	return 0;
-}
-
-static unsigned int sync_file_poll(struct file *file, poll_table *wait)
-{
-	struct sync_file *sync_file = file->private_data;
-	int status;
-
-	poll_wait(file, &sync_file->wq, wait);
-
-	status = atomic_read(&sync_file->status);
-
-	if (!status)
-		return POLLIN;
-	if (status < 0)
-		return POLLERR;
-	return 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 void sync_fill_fence_info(struct 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));
-	if (fence_is_signaled(fence))
-		info->status = fence->status >= 0 ? 1 : fence->status;
-	else
-		info->status = 0;
-	info->timestamp_ns = ktime_to_ns(fence->timestamp);
-}
-
-static long sync_file_ioctl_fence_info(struct sync_file *sync_file,
-				       unsigned long arg)
-{
-	struct sync_file_info info;
-	struct sync_fence_info *fence_info = NULL;
-	__u32 size;
-	int ret, i;
-
-	if (copy_from_user(&info, (void __user *)arg, sizeof(info)))
-		return -EFAULT;
-
-	if (info.flags || info.pad)
-		return -EINVAL;
-
-	/*
-	 * 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)
-		goto no_fences;
-
-	if (info.num_fences < sync_file->num_fences)
-		return -EINVAL;
-
-	size = sync_file->num_fences * sizeof(*fence_info);
-	fence_info = kzalloc(size, GFP_KERNEL);
-	if (!fence_info)
-		return -ENOMEM;
-
-	for (i = 0; i < sync_file->num_fences; ++i)
-		sync_fill_fence_info(sync_file->cbs[i].fence, &fence_info[i]);
-
-	if (copy_to_user(u64_to_user_ptr(info.sync_fence_info), fence_info,
-			 size)) {
-		ret = -EFAULT;
-		goto out;
-	}
-
-no_fences:
-	strlcpy(info.name, sync_file->name, sizeof(info.name));
-	info.status = atomic_read(&sync_file->status);
-	if (info.status >= 0)
-		info.status = !info.status;
-
-	info.num_fences = sync_file->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 = sync_file_ioctl,
-};
-