---
drivers/dma-buf/Kconfig | 13 --
drivers/dma-buf/Makefile | 1 -
drivers/dma-buf/sw_sync.c | 412 -----------------------------------
drivers/dma-buf/sync_debug.c | 190 ----------------
drivers/dma-buf/sync_debug.h | 72 ------
5 files changed, 688 deletions(-)
delete mode 100644 drivers/dma-buf/sw_sync.c
delete mode 100644 drivers/dma-buf/sync_debug.c
delete mode 100644 drivers/dma-buf/sync_debug.h
diff --git a/drivers/dma-buf/Kconfig b/drivers/dma-buf/Kconfig
index 9561e3d2d428..26c53f45616a 100644
--- a/drivers/dma-buf/Kconfig
+++ b/drivers/dma-buf/Kconfig
@@ -17,19 +17,6 @@ config SYNC_FILE
Files fds, to the DRM driver for example. More details at
Documentation/driver-api/sync_file.rst.
-config SW_SYNC
- bool "Sync File Validation Framework"
- default n
- depends on SYNC_FILE
- depends on DEBUG_FS
- help
- A sync object driver that uses a 32bit counter to coordinate
- synchronization. Useful when there is no hardware primitive backing
- the synchronization.
-
- WARNING: improper use of this can result in deadlocking kernel
- drivers from userspace. Intended for test and debug only.
-
config UDMABUF
bool "userspace dmabuf misc driver"
default n
diff --git a/drivers/dma-buf/Makefile b/drivers/dma-buf/Makefile
index 1ef021273a06..fa3af0953f87 100644
--- a/drivers/dma-buf/Makefile
+++ b/drivers/dma-buf/Makefile
@@ -4,7 +4,6 @@ obj-y := dma-buf.o dma-fence.o dma-fence-array.o dma-fence-chain.o \
obj-$(CONFIG_DMABUF_HEAPS) += dma-heap.o
obj-$(CONFIG_DMABUF_HEAPS) += heaps/
obj-$(CONFIG_SYNC_FILE) += sync_file.o
-obj-$(CONFIG_SW_SYNC) += sw_sync.o sync_debug.o
obj-$(CONFIG_UDMABUF) += udmabuf.o
obj-$(CONFIG_DMABUF_SYSFS_STATS) += dma-buf-sysfs-stats.o
diff --git a/drivers/dma-buf/sw_sync.c b/drivers/dma-buf/sw_sync.c
deleted file mode 100644
index 348b3a9170fa..000000000000
--- a/drivers/dma-buf/sw_sync.c
+++ /dev/null
@@ -1,412 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Sync File validation framework
- *
- * Copyright (C) 2012 Google, Inc.
- */
-
-#include <linux/file.h>
-#include <linux/fs.h>
-#include <linux/uaccess.h>
-#include <linux/slab.h>
-#include <linux/sync_file.h>
-
-#include "sync_debug.h"
-
-#define CREATE_TRACE_POINTS
-#include "sync_trace.h"
-
-/*
- * SW SYNC validation framework
- *
- * A sync object driver that uses a 32bit counter to coordinate
- * synchronization. Useful when there is no hardware primitive backing
- * the synchronization.
- *
- * To start the framework just open:
- *
- * <debugfs>/sync/sw_sync
- *
- * That will create a sync timeline, all fences created under this timeline
- * file descriptor will belong to the this timeline.
- *
- * The 'sw_sync' file can be opened many times as to create different
- * timelines.
- *
- * Fences can be created with SW_SYNC_IOC_CREATE_FENCE ioctl with struct
- * sw_sync_create_fence_data as parameter.
- *
- * To increment the timeline counter, SW_SYNC_IOC_INC ioctl should be used
- * with the increment as u32. This will update the last signaled value
- * from the timeline and signal any fence that has a seqno smaller or equal
- * to it.
- *
- * struct sw_sync_create_fence_data
- * @value: the seqno to initialise the fence with
- * @name: the name of the new sync point
- * @fence: return the fd of the new sync_file with the created fence
- */
-struct sw_sync_create_fence_data {
- __u32 value;
- char name[32];
- __s32 fence; /* fd of new fence */
-};
-
-#define SW_SYNC_IOC_MAGIC 'W'
-
-#define SW_SYNC_IOC_CREATE_FENCE _IOWR(SW_SYNC_IOC_MAGIC, 0,\
- struct sw_sync_create_fence_data)
-
-#define SW_SYNC_IOC_INC _IOW(SW_SYNC_IOC_MAGIC, 1, __u32)
-
-static const struct dma_fence_ops timeline_fence_ops;
-
-static inline struct sync_pt *dma_fence_to_sync_pt(struct dma_fence *fence)
-{
- if (fence->ops != &timeline_fence_ops)
- return NULL;
- return container_of(fence, struct sync_pt, base);
-}
-
-/**
- * sync_timeline_create() - creates a sync object
- * @name: sync_timeline name
- *
- * Creates a new sync_timeline. Returns the sync_timeline object or NULL in
- * case of error.
- */
-static struct sync_timeline *sync_timeline_create(const char *name)
-{
- struct sync_timeline *obj;
-
- obj = kzalloc(sizeof(*obj), GFP_KERNEL);
- if (!obj)
- return NULL;
-
- kref_init(&obj->kref);
- obj->context = dma_fence_context_alloc(1);
- strlcpy(obj->name, name, sizeof(obj->name));
-
- obj->pt_tree = RB_ROOT;
- INIT_LIST_HEAD(&obj->pt_list);
- spin_lock_init(&obj->lock);
-
- sync_timeline_debug_add(obj);
-
- return obj;
-}
-
-static void sync_timeline_free(struct kref *kref)
-{
- struct sync_timeline *obj =
- container_of(kref, struct sync_timeline, kref);
-
- sync_timeline_debug_remove(obj);
-
- kfree(obj);
-}
-
-static void sync_timeline_get(struct sync_timeline *obj)
-{
- kref_get(&obj->kref);
-}
-
-static void sync_timeline_put(struct sync_timeline *obj)
-{
- kref_put(&obj->kref, sync_timeline_free);
-}
-
-static const char *timeline_fence_get_driver_name(struct dma_fence *fence)
-{
- return "sw_sync";
-}
-
-static const char *timeline_fence_get_timeline_name(struct dma_fence *fence)
-{
- struct sync_timeline *parent = dma_fence_parent(fence);
-
- return parent->name;
-}
-
-static void timeline_fence_release(struct dma_fence *fence)
-{
- struct sync_pt *pt = dma_fence_to_sync_pt(fence);
- struct sync_timeline *parent = dma_fence_parent(fence);
- unsigned long flags;
-
- spin_lock_irqsave(fence->lock, flags);
- if (!list_empty(&pt->link)) {
- list_del(&pt->link);
- rb_erase(&pt->node, &parent->pt_tree);
- }
- spin_unlock_irqrestore(fence->lock, flags);
-
- sync_timeline_put(parent);
- dma_fence_free(fence);
-}
-
-static bool timeline_fence_signaled(struct dma_fence *fence)
-{
- struct sync_timeline *parent = dma_fence_parent(fence);
-
- return !__dma_fence_is_later(fence->seqno, parent->value, fence->ops);
-}
-
-static bool timeline_fence_enable_signaling(struct dma_fence *fence)
-{
- return true;
-}
-
-static void timeline_fence_value_str(struct dma_fence *fence,
- char *str, int size)
-{
- snprintf(str, size, "%lld", fence->seqno);
-}
-
-static void timeline_fence_timeline_value_str(struct dma_fence *fence,
- char *str, int size)
-{
- struct sync_timeline *parent = dma_fence_parent(fence);
-
- snprintf(str, size, "%d", parent->value);
-}
-
-static const struct dma_fence_ops timeline_fence_ops = {
- .get_driver_name = timeline_fence_get_driver_name,
- .get_timeline_name = timeline_fence_get_timeline_name,
- .enable_signaling = timeline_fence_enable_signaling,
- .signaled = timeline_fence_signaled,
- .release = timeline_fence_release,
- .fence_value_str = timeline_fence_value_str,
- .timeline_value_str = timeline_fence_timeline_value_str,
-};
-
-/**
- * sync_timeline_signal() - signal a status change on a sync_timeline
- * @obj: sync_timeline to signal
- * @inc: num to increment on timeline->value
- *
- * A sync implementation should call this any time one of it's fences
- * has signaled or has an error condition.
- */
-static void sync_timeline_signal(struct sync_timeline *obj, unsigned int inc)
-{
- struct sync_pt *pt, *next;
-
- trace_sync_timeline(obj);
-
- spin_lock_irq(&obj->lock);
-
- obj->value += inc;
-
- list_for_each_entry_safe(pt, next, &obj->pt_list, link) {
- if (!timeline_fence_signaled(&pt->base))
- break;
-
- list_del_init(&pt->link);
- rb_erase(&pt->node, &obj->pt_tree);
-
- /*
- * A signal callback may release the last reference to this
- * fence, causing it to be freed. That operation has to be
- * last to avoid a use after free inside this loop, and must
- * be after we remove the fence from the timeline in order to
- * prevent deadlocking on timeline->lock inside
- * timeline_fence_release().
- */
- dma_fence_signal_locked(&pt->base);
- }
-
- spin_unlock_irq(&obj->lock);
-}
-
-/**
- * sync_pt_create() - creates a sync pt
- * @obj: parent sync_timeline
- * @value: value of the fence
- *
- * Creates a new sync_pt (fence) as a child of @parent. @size bytes will be
- * allocated allowing for implementation specific data to be kept after
- * the generic sync_timeline struct. Returns the sync_pt object or
- * NULL in case of error.
- */
-static struct sync_pt *sync_pt_create(struct sync_timeline *obj,
- unsigned int value)
-{
- struct sync_pt *pt;
-
- pt = kzalloc(sizeof(*pt), GFP_KERNEL);
- if (!pt)
- return NULL;
-
- sync_timeline_get(obj);
- dma_fence_init(&pt->base, &timeline_fence_ops, &obj->lock,
- obj->context, value);
- INIT_LIST_HEAD(&pt->link);
-
- spin_lock_irq(&obj->lock);
- if (!dma_fence_is_signaled_locked(&pt->base)) {
- struct rb_node **p = &obj->pt_tree.rb_node;
- struct rb_node *parent = NULL;
-
- while (*p) {
- struct sync_pt *other;
- int cmp;
-
- parent = *p;
- other = rb_entry(parent, typeof(*pt), node);
- cmp = value - other->base.seqno;
- if (cmp > 0) {
- p = &parent->rb_right;
- } else if (cmp < 0) {
- p = &parent->rb_left;
- } else {
- if (dma_fence_get_rcu(&other->base)) {
- sync_timeline_put(obj);
- kfree(pt);
- pt = other;
- goto unlock;
- }
- p = &parent->rb_left;
- }
- }
- rb_link_node(&pt->node, parent, p);
- rb_insert_color(&pt->node, &obj->pt_tree);
-
- parent = rb_next(&pt->node);
- list_add_tail(&pt->link,
- parent ? &rb_entry(parent, typeof(*pt), node)->link : &obj->pt_list);
- }
-unlock:
- spin_unlock_irq(&obj->lock);
-
- return pt;
-}
-
-/*
- * *WARNING*
- *
- * improper use of this can result in deadlocking kernel drivers from userspace.
- */
-
-/* opening sw_sync create a new sync obj */
-static int sw_sync_debugfs_open(struct inode *inode, struct file *file)
-{
- struct sync_timeline *obj;
- char task_comm[TASK_COMM_LEN];
-
- get_task_comm(task_comm, current);
-
- obj = sync_timeline_create(task_comm);
- if (!obj)
- return -ENOMEM;
-
- file->private_data = obj;
-
- return 0;
-}
-
-static int sw_sync_debugfs_release(struct inode *inode, struct file *file)
-{
- struct sync_timeline *obj = file->private_data;
- struct sync_pt *pt, *next;
-
- spin_lock_irq(&obj->lock);
-
- list_for_each_entry_safe(pt, next, &obj->pt_list, link) {
- dma_fence_set_error(&pt->base, -ENOENT);
- dma_fence_signal_locked(&pt->base);
- }
-
- spin_unlock_irq(&obj->lock);
-
- sync_timeline_put(obj);
- return 0;
-}
-
-static long sw_sync_ioctl_create_fence(struct sync_timeline *obj,
- unsigned long arg)
-{
- int fd = get_unused_fd_flags(O_CLOEXEC);
- int err;
- struct sync_pt *pt;
- struct sync_file *sync_file;
- struct sw_sync_create_fence_data data;
-
- if (fd < 0)
- return fd;
-
- if (copy_from_user(&data, (void __user *)arg, sizeof(data))) {
- err = -EFAULT;
- goto err;
- }
-
- pt = sync_pt_create(obj, data.value);
- if (!pt) {
- err = -ENOMEM;
- goto err;
- }
-
- sync_file = sync_file_create(&pt->base);
- dma_fence_put(&pt->base);
- if (!sync_file) {
- err = -ENOMEM;
- goto err;
- }
-
- data.fence = fd;
- if (copy_to_user((void __user *)arg, &data, sizeof(data))) {
- fput(sync_file->file);
- err = -EFAULT;
- goto err;
- }
-
- fd_install(fd, sync_file->file);
-
- return 0;
-
-err:
- put_unused_fd(fd);
- return err;
-}
-
-static long sw_sync_ioctl_inc(struct sync_timeline *obj, unsigned long arg)
-{
- u32 value;
-
- if (copy_from_user(&value, (void __user *)arg, sizeof(value)))
- return -EFAULT;
-
- while (value > INT_MAX) {
- sync_timeline_signal(obj, INT_MAX);
- value -= INT_MAX;
- }
-
- sync_timeline_signal(obj, value);
-
- return 0;
-}
-
-static long sw_sync_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- struct sync_timeline *obj = file->private_data;
-
- switch (cmd) {
- case SW_SYNC_IOC_CREATE_FENCE:
- return sw_sync_ioctl_create_fence(obj, arg);
-
- case SW_SYNC_IOC_INC:
- return sw_sync_ioctl_inc(obj, arg);
-
- default:
- return -ENOTTY;
- }
-}
-
-const struct file_operations sw_sync_debugfs_fops = {
- .open = sw_sync_debugfs_open,
- .release = sw_sync_debugfs_release,
- .unlocked_ioctl = sw_sync_ioctl,
- .compat_ioctl = compat_ptr_ioctl,
-};
diff --git a/drivers/dma-buf/sync_debug.c b/drivers/dma-buf/sync_debug.c
deleted file mode 100644
index 101394f16930..000000000000
--- a/drivers/dma-buf/sync_debug.c
+++ /dev/null
@@ -1,190 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Sync File validation framework and debug information
- *
- * Copyright (C) 2012 Google, Inc.
- */
-
-#include <linux/debugfs.h>
-#include "sync_debug.h"
-
-static struct dentry *dbgfs;
-
-static LIST_HEAD(sync_timeline_list_head);
-static DEFINE_SPINLOCK(sync_timeline_list_lock);
-static LIST_HEAD(sync_file_list_head);
-static DEFINE_SPINLOCK(sync_file_list_lock);
-
-void sync_timeline_debug_add(struct sync_timeline *obj)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&sync_timeline_list_lock, flags);
- list_add_tail(&obj->sync_timeline_list, &sync_timeline_list_head);
- spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
-}
-
-void sync_timeline_debug_remove(struct sync_timeline *obj)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&sync_timeline_list_lock, flags);
- list_del(&obj->sync_timeline_list);
- spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
-}
-
-void sync_file_debug_add(struct sync_file *sync_file)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&sync_file_list_lock, flags);
- list_add_tail(&sync_file->sync_file_list, &sync_file_list_head);
- spin_unlock_irqrestore(&sync_file_list_lock, flags);
-}
-
-void sync_file_debug_remove(struct sync_file *sync_file)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&sync_file_list_lock, flags);
- list_del(&sync_file->sync_file_list);
- spin_unlock_irqrestore(&sync_file_list_lock, flags);
-}
-
-static const char *sync_status_str(int status)
-{
- if (status < 0)
- return "error";
-
- if (status > 0)
- return "signaled";
-
- return "active";
-}
-
-static void sync_print_fence(struct seq_file *s,
- struct dma_fence *fence, bool show)
-{
- struct sync_timeline *parent = dma_fence_parent(fence);
- int status;
-
- status = dma_fence_get_status_locked(fence);
-
- seq_printf(s, " %s%sfence %s",
- show ? parent->name : "",
- show ? "_" : "",
- sync_status_str(status));
-
- if (test_bit(DMA_FENCE_FLAG_TIMESTAMP_BIT, &fence->flags)) {
- struct timespec64 ts64 =
- ktime_to_timespec64(fence->timestamp);
-
- seq_printf(s, "@%lld.%09ld", (s64)ts64.tv_sec, ts64.tv_nsec);
- }
-
- if (fence->ops->timeline_value_str &&
- fence->ops->fence_value_str) {
- char value[64];
- bool success;
-
- fence->ops->fence_value_str(fence, value, sizeof(value));
- success = strlen(value);
-
- if (success) {
- seq_printf(s, ": %s", value);
-
- fence->ops->timeline_value_str(fence, value,
- sizeof(value));
-
- if (strlen(value))
- seq_printf(s, " / %s", value);
- }
- }
-
- seq_putc(s, '\n');
-}
-
-static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj)
-{
- struct list_head *pos;
-
- seq_printf(s, "%s: %d\n", obj->name, obj->value);
-
- spin_lock_irq(&obj->lock);
- list_for_each(pos, &obj->pt_list) {
- struct sync_pt *pt = container_of(pos, struct sync_pt, link);
- sync_print_fence(s, &pt->base, false);
- }
- spin_unlock_irq(&obj->lock);
-}
-
-static void sync_print_sync_file(struct seq_file *s,
- struct sync_file *sync_file)
-{
- char buf[128];
- int i;
-
- seq_printf(s, "[%p] %s: %s\n", sync_file,
- sync_file_get_name(sync_file, buf, sizeof(buf)),
- sync_status_str(dma_fence_get_status(sync_file->fence)));
-
- if (dma_fence_is_array(sync_file->fence)) {
- struct dma_fence_array *array = to_dma_fence_array(sync_file->fence);
-
- for (i = 0; i < array->num_fences; ++i)
- sync_print_fence(s, array->fences[i], true);
- } else {
- sync_print_fence(s, sync_file->fence, true);
- }
-}
-
-static int sync_info_debugfs_show(struct seq_file *s, void *unused)
-{
- struct list_head *pos;
-
- seq_puts(s, "objs:\n--------------\n");
-
- spin_lock_irq(&sync_timeline_list_lock);
- list_for_each(pos, &sync_timeline_list_head) {
- struct sync_timeline *obj =
- container_of(pos, struct sync_timeline,
- sync_timeline_list);
-
- sync_print_obj(s, obj);
- seq_putc(s, '\n');
- }
- spin_unlock_irq(&sync_timeline_list_lock);
-
- seq_puts(s, "fences:\n--------------\n");
-
- spin_lock_irq(&sync_file_list_lock);
- list_for_each(pos, &sync_file_list_head) {
- struct sync_file *sync_file =
- container_of(pos, struct sync_file, sync_file_list);
-
- sync_print_sync_file(s, sync_file);
- seq_putc(s, '\n');
- }
- spin_unlock_irq(&sync_file_list_lock);
- return 0;
-}
-
-DEFINE_SHOW_ATTRIBUTE(sync_info_debugfs);
-
-static __init int sync_debugfs_init(void)
-{
- dbgfs = debugfs_create_dir("sync", NULL);
-
- /*
- * The debugfs files won't ever get removed and thus, there is
- * no need to protect it against removal races. The use of
- * debugfs_create_file_unsafe() is actually safe here.
- */
- debugfs_create_file_unsafe("info", 0444, dbgfs, NULL,
- &sync_info_debugfs_fops);
- debugfs_create_file_unsafe("sw_sync", 0644, dbgfs, NULL,
- &sw_sync_debugfs_fops);
-
- return 0;
-}
-late_initcall(sync_debugfs_init);
diff --git a/drivers/dma-buf/sync_debug.h b/drivers/dma-buf/sync_debug.h
deleted file mode 100644
index 6176e52ba2d7..000000000000
--- a/drivers/dma-buf/sync_debug.h
+++ /dev/null
@@ -1,72 +0,0 @@
-/*
- * Sync File validation framework and debug infomation
- *
- * Copyright (C) 2012 Google, Inc.
- *
- * 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.
- *
- */
-
-#ifndef _LINUX_SYNC_H
-#define _LINUX_SYNC_H
-
-#include <linux/list.h>
-#include <linux/rbtree.h>
-#include <linux/spinlock.h>
-#include <linux/dma-fence.h>
-
-#include <linux/sync_file.h>
-#include <uapi/linux/sync_file.h>
-
-/**
- * struct sync_timeline - sync object
- * @kref: reference count on fence.
- * @name: name of the sync_timeline. Useful for debugging
- * @lock: lock protecting @pt_list and @value
- * @pt_tree: rbtree of active (unsignaled/errored) sync_pts
- * @pt_list: list of active (unsignaled/errored) sync_pts
- * @sync_timeline_list: membership in global sync_timeline_list
- */
-struct sync_timeline {
- struct kref kref;
- char name[32];
-
- /* protected by lock */
- u64 context;
- int value;
-
- struct rb_root pt_tree;
- struct list_head pt_list;
- spinlock_t lock;
-
- struct list_head sync_timeline_list;
-};
-
-static inline struct sync_timeline *dma_fence_parent(struct dma_fence *fence)
-{
- return container_of(fence->lock, struct sync_timeline, lock);
-}
-
-/**
- * struct sync_pt - sync_pt object
- * @base: base fence object
- * @link: link on the sync timeline's list
- * @node: node in the sync timeline's tree
- */
-struct sync_pt {
- struct dma_fence base;
- struct list_head link;
- struct rb_node node;
-};
-
-extern const struct file_operations sw_sync_debugfs_fops;
-
-void sync_timeline_debug_add(struct sync_timeline *obj);
-void sync_timeline_debug_remove(struct sync_timeline *obj);
-void sync_file_debug_add(struct sync_file *fence);
-void sync_file_debug_remove(struct sync_file *fence);
-
-#endif /* _LINUX_SYNC_H */
--
2.25.1
