730 lines
16 KiB
C
730 lines
16 KiB
C
/*
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* drivers/base/sync.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/debugfs.h>
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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/seq_file.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 "sync.h"
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#define CREATE_TRACE_POINTS
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#include "trace/sync.h"
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static const struct fence_ops android_fence_ops;
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static const struct file_operations sync_fence_fops;
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struct sync_timeline *sync_timeline_create(const struct sync_timeline_ops *ops,
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int size, const char *name)
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{
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struct sync_timeline *obj;
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if (size < sizeof(struct sync_timeline))
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return NULL;
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obj = kzalloc(size, GFP_KERNEL);
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if (obj == NULL)
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return NULL;
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kref_init(&obj->kref);
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obj->ops = ops;
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obj->context = fence_context_alloc(1);
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strlcpy(obj->name, name, sizeof(obj->name));
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INIT_LIST_HEAD(&obj->child_list_head);
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INIT_LIST_HEAD(&obj->active_list_head);
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spin_lock_init(&obj->child_list_lock);
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sync_timeline_debug_add(obj);
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return obj;
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}
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EXPORT_SYMBOL(sync_timeline_create);
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static void sync_timeline_free(struct kref *kref)
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{
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struct sync_timeline *obj =
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container_of(kref, struct sync_timeline, kref);
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sync_timeline_debug_remove(obj);
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if (obj->ops->release_obj)
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obj->ops->release_obj(obj);
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kfree(obj);
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}
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static void sync_timeline_get(struct sync_timeline *obj)
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{
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kref_get(&obj->kref);
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}
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static void sync_timeline_put(struct sync_timeline *obj)
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{
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kref_put(&obj->kref, sync_timeline_free);
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}
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void sync_timeline_destroy(struct sync_timeline *obj)
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{
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obj->destroyed = true;
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/*
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* Ensure timeline is marked as destroyed before
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* changing timeline's fences status.
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*/
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smp_wmb();
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/*
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* signal any children that their parent is going away.
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*/
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sync_timeline_signal(obj);
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sync_timeline_put(obj);
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}
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EXPORT_SYMBOL(sync_timeline_destroy);
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void sync_timeline_signal(struct sync_timeline *obj)
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{
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unsigned long flags;
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LIST_HEAD(signaled_pts);
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struct sync_pt *pt, *next;
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trace_sync_timeline(obj);
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spin_lock_irqsave(&obj->child_list_lock, flags);
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list_for_each_entry_safe(pt, next, &obj->active_list_head,
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active_list) {
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if (fence_is_signaled_locked(&pt->base))
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list_del(&pt->active_list);
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}
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spin_unlock_irqrestore(&obj->child_list_lock, flags);
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}
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EXPORT_SYMBOL(sync_timeline_signal);
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struct sync_pt *sync_pt_create(struct sync_timeline *obj, int size)
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{
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unsigned long flags;
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struct sync_pt *pt;
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if (size < sizeof(struct sync_pt))
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return NULL;
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pt = kzalloc(size, GFP_KERNEL);
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if (pt == NULL)
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return NULL;
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spin_lock_irqsave(&obj->child_list_lock, flags);
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sync_timeline_get(obj);
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fence_init(&pt->base, &android_fence_ops, &obj->child_list_lock,
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obj->context, ++obj->value);
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list_add_tail(&pt->child_list, &obj->child_list_head);
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INIT_LIST_HEAD(&pt->active_list);
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spin_unlock_irqrestore(&obj->child_list_lock, flags);
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return pt;
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}
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EXPORT_SYMBOL(sync_pt_create);
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void sync_pt_free(struct sync_pt *pt)
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{
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fence_put(&pt->base);
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}
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EXPORT_SYMBOL(sync_pt_free);
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static struct sync_fence *sync_fence_alloc(int size, const char *name)
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{
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struct sync_fence *fence;
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fence = kzalloc(size, GFP_KERNEL);
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if (fence == NULL)
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return NULL;
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fence->file = anon_inode_getfile("sync_fence", &sync_fence_fops,
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fence, 0);
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if (IS_ERR(fence->file))
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goto err;
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kref_init(&fence->kref);
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strlcpy(fence->name, name, sizeof(fence->name));
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init_waitqueue_head(&fence->wq);
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return fence;
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err:
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kfree(fence);
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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_fence_cb *check;
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struct sync_fence *fence;
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check = container_of(cb, struct sync_fence_cb, cb);
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fence = check->fence;
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if (atomic_dec_and_test(&fence->status))
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wake_up_all(&fence->wq);
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}
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/* TODO: implement a create which takes more that one sync_pt */
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struct sync_fence *sync_fence_create(const char *name, struct sync_pt *pt)
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{
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struct sync_fence *fence;
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fence = sync_fence_alloc(offsetof(struct sync_fence, cbs[1]), name);
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if (fence == NULL)
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return NULL;
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fence->num_fences = 1;
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atomic_set(&fence->status, 1);
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fence->cbs[0].sync_pt = &pt->base;
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fence->cbs[0].fence = fence;
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if (fence_add_callback(&pt->base, &fence->cbs[0].cb,
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fence_check_cb_func))
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atomic_dec(&fence->status);
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sync_fence_debug_add(fence);
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return fence;
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}
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EXPORT_SYMBOL(sync_fence_create);
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struct sync_fence *sync_fence_fdget(int fd)
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{
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struct file *file = fget(fd);
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if (file == NULL)
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return NULL;
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if (file->f_op != &sync_fence_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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EXPORT_SYMBOL(sync_fence_fdget);
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void sync_fence_put(struct sync_fence *fence)
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{
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fput(fence->file);
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}
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EXPORT_SYMBOL(sync_fence_put);
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void sync_fence_install(struct sync_fence *fence, int fd)
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{
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fd_install(fd, fence->file);
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}
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EXPORT_SYMBOL(sync_fence_install);
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static void sync_fence_add_pt(struct sync_fence *fence,
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int *i, struct fence *pt)
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{
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fence->cbs[*i].sync_pt = pt;
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fence->cbs[*i].fence = fence;
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if (!fence_add_callback(pt, &fence->cbs[*i].cb, fence_check_cb_func)) {
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fence_get(pt);
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(*i)++;
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}
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}
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struct sync_fence *sync_fence_merge(const char *name,
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struct sync_fence *a, struct sync_fence *b)
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{
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int num_fences = a->num_fences + b->num_fences;
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struct sync_fence *fence;
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int i, i_a, i_b;
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unsigned long size = offsetof(struct sync_fence, cbs[num_fences]);
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fence = sync_fence_alloc(size, name);
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if (fence == NULL)
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return NULL;
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atomic_set(&fence->status, num_fences);
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/*
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* Assume sync_fence 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_fence can only be created with sync_fence_merge
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* and sync_fence_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].sync_pt;
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struct fence *pt_b = b->cbs[i_b].sync_pt;
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if (pt_a->context < pt_b->context) {
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sync_fence_add_pt(fence, &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_fence_add_pt(fence, &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_fence_add_pt(fence, &i, pt_a);
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else
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sync_fence_add_pt(fence, &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_fence_add_pt(fence, &i, a->cbs[i_a].sync_pt);
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for (; i_b < b->num_fences; i_b++)
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sync_fence_add_pt(fence, &i, b->cbs[i_b].sync_pt);
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if (num_fences > i)
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atomic_sub(num_fences - i, &fence->status);
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fence->num_fences = i;
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sync_fence_debug_add(fence);
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return fence;
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}
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EXPORT_SYMBOL(sync_fence_merge);
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int sync_fence_wake_up_wq(wait_queue_t *curr, unsigned mode,
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int wake_flags, void *key)
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{
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struct sync_fence_waiter *wait;
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wait = container_of(curr, struct sync_fence_waiter, work);
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list_del_init(&wait->work.task_list);
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wait->callback(wait->work.private, wait);
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return 1;
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}
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int sync_fence_wait_async(struct sync_fence *fence,
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struct sync_fence_waiter *waiter)
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{
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int err = atomic_read(&fence->status);
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unsigned long flags;
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if (err < 0)
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return err;
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if (!err)
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return 1;
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init_waitqueue_func_entry(&waiter->work, sync_fence_wake_up_wq);
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waiter->work.private = fence;
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spin_lock_irqsave(&fence->wq.lock, flags);
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err = atomic_read(&fence->status);
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if (err > 0)
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__add_wait_queue_tail(&fence->wq, &waiter->work);
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spin_unlock_irqrestore(&fence->wq.lock, flags);
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if (err < 0)
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return err;
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return !err;
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}
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EXPORT_SYMBOL(sync_fence_wait_async);
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int sync_fence_cancel_async(struct sync_fence *fence,
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struct sync_fence_waiter *waiter)
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{
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unsigned long flags;
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int ret = 0;
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spin_lock_irqsave(&fence->wq.lock, flags);
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if (!list_empty(&waiter->work.task_list))
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list_del_init(&waiter->work.task_list);
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else
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ret = -ENOENT;
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spin_unlock_irqrestore(&fence->wq.lock, flags);
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return ret;
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}
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EXPORT_SYMBOL(sync_fence_cancel_async);
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int sync_fence_wait(struct sync_fence *fence, long timeout)
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{
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long ret;
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int i;
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if (timeout < 0)
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timeout = MAX_SCHEDULE_TIMEOUT;
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else
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timeout = msecs_to_jiffies(timeout);
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trace_sync_wait(fence, 1);
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for (i = 0; i < fence->num_fences; ++i)
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trace_sync_pt(fence->cbs[i].sync_pt);
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ret = wait_event_interruptible_timeout(fence->wq,
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atomic_read(&fence->status) <= 0,
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timeout);
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trace_sync_wait(fence, 0);
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if (ret < 0) {
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return ret;
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} else if (ret == 0) {
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if (timeout) {
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pr_info("fence timeout on [%p] after %dms\n", fence,
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jiffies_to_msecs(timeout));
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sync_dump();
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}
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return -ETIME;
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}
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ret = atomic_read(&fence->status);
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if (ret) {
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pr_info("fence error %ld on [%p]\n", ret, fence);
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sync_dump();
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}
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return ret;
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}
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EXPORT_SYMBOL(sync_fence_wait);
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static const char *android_fence_get_driver_name(struct fence *fence)
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{
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struct sync_pt *pt = container_of(fence, struct sync_pt, base);
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struct sync_timeline *parent = sync_pt_parent(pt);
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return parent->ops->driver_name;
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}
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static const char *android_fence_get_timeline_name(struct fence *fence)
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{
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struct sync_pt *pt = container_of(fence, struct sync_pt, base);
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struct sync_timeline *parent = sync_pt_parent(pt);
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return parent->name;
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}
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static void android_fence_release(struct fence *fence)
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{
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struct sync_pt *pt = container_of(fence, struct sync_pt, base);
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struct sync_timeline *parent = sync_pt_parent(pt);
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unsigned long flags;
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spin_lock_irqsave(fence->lock, flags);
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list_del(&pt->child_list);
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if (WARN_ON_ONCE(!list_empty(&pt->active_list)))
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list_del(&pt->active_list);
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spin_unlock_irqrestore(fence->lock, flags);
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if (parent->ops->free_pt)
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parent->ops->free_pt(pt);
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sync_timeline_put(parent);
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fence_free(&pt->base);
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}
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static bool android_fence_signaled(struct fence *fence)
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{
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struct sync_pt *pt = container_of(fence, struct sync_pt, base);
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struct sync_timeline *parent = sync_pt_parent(pt);
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int ret;
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ret = parent->ops->has_signaled(pt);
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if (ret < 0)
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fence->status = ret;
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return ret;
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}
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static bool android_fence_enable_signaling(struct fence *fence)
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{
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struct sync_pt *pt = container_of(fence, struct sync_pt, base);
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struct sync_timeline *parent = sync_pt_parent(pt);
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if (android_fence_signaled(fence))
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return false;
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list_add_tail(&pt->active_list, &parent->active_list_head);
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return true;
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}
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static int android_fence_fill_driver_data(struct fence *fence,
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void *data, int size)
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{
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struct sync_pt *pt = container_of(fence, struct sync_pt, base);
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struct sync_timeline *parent = sync_pt_parent(pt);
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if (!parent->ops->fill_driver_data)
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return 0;
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return parent->ops->fill_driver_data(pt, data, size);
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}
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static void android_fence_value_str(struct fence *fence,
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char *str, int size)
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{
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struct sync_pt *pt = container_of(fence, struct sync_pt, base);
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struct sync_timeline *parent = sync_pt_parent(pt);
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if (!parent->ops->pt_value_str) {
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if (size)
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*str = 0;
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return;
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}
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parent->ops->pt_value_str(pt, str, size);
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}
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static void android_fence_timeline_value_str(struct fence *fence,
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char *str, int size)
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{
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struct sync_pt *pt = container_of(fence, struct sync_pt, base);
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struct sync_timeline *parent = sync_pt_parent(pt);
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if (!parent->ops->timeline_value_str) {
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if (size)
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*str = 0;
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return;
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}
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parent->ops->timeline_value_str(parent, str, size);
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}
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static const struct fence_ops android_fence_ops = {
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.get_driver_name = android_fence_get_driver_name,
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.get_timeline_name = android_fence_get_timeline_name,
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.enable_signaling = android_fence_enable_signaling,
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.signaled = android_fence_signaled,
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.wait = fence_default_wait,
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.release = android_fence_release,
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.fill_driver_data = android_fence_fill_driver_data,
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.fence_value_str = android_fence_value_str,
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.timeline_value_str = android_fence_timeline_value_str,
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};
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static void sync_fence_free(struct kref *kref)
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{
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struct sync_fence *fence = container_of(kref, struct sync_fence, kref);
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int i, status = atomic_read(&fence->status);
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for (i = 0; i < fence->num_fences; ++i) {
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if (status)
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fence_remove_callback(fence->cbs[i].sync_pt,
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&fence->cbs[i].cb);
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fence_put(fence->cbs[i].sync_pt);
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}
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|
|
|
kfree(fence);
|
|
}
|
|
|
|
static int sync_fence_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct sync_fence *fence = file->private_data;
|
|
|
|
sync_fence_debug_remove(fence);
|
|
|
|
kref_put(&fence->kref, sync_fence_free);
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int sync_fence_poll(struct file *file, poll_table *wait)
|
|
{
|
|
struct sync_fence *fence = file->private_data;
|
|
int status;
|
|
|
|
poll_wait(file, &fence->wq, wait);
|
|
|
|
status = atomic_read(&fence->status);
|
|
|
|
if (!status)
|
|
return POLLIN;
|
|
else if (status < 0)
|
|
return POLLERR;
|
|
return 0;
|
|
}
|
|
|
|
static long sync_fence_ioctl_wait(struct sync_fence *fence, unsigned long arg)
|
|
{
|
|
__s32 value;
|
|
|
|
if (copy_from_user(&value, (void __user *)arg, sizeof(value)))
|
|
return -EFAULT;
|
|
|
|
return sync_fence_wait(fence, value);
|
|
}
|
|
|
|
static long sync_fence_ioctl_merge(struct sync_fence *fence, unsigned long arg)
|
|
{
|
|
int fd = get_unused_fd_flags(O_CLOEXEC);
|
|
int err;
|
|
struct sync_fence *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;
|
|
}
|
|
|
|
fence2 = sync_fence_fdget(data.fd2);
|
|
if (fence2 == NULL) {
|
|
err = -ENOENT;
|
|
goto err_put_fd;
|
|
}
|
|
|
|
data.name[sizeof(data.name) - 1] = '\0';
|
|
fence3 = sync_fence_merge(data.name, fence, fence2);
|
|
if (fence3 == NULL) {
|
|
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;
|
|
}
|
|
|
|
sync_fence_install(fence3, fd);
|
|
sync_fence_put(fence2);
|
|
return 0;
|
|
|
|
err_put_fence3:
|
|
sync_fence_put(fence3);
|
|
|
|
err_put_fence2:
|
|
sync_fence_put(fence2);
|
|
|
|
err_put_fd:
|
|
put_unused_fd(fd);
|
|
return err;
|
|
}
|
|
|
|
static int sync_fill_pt_info(struct fence *fence, void *data, int size)
|
|
{
|
|
struct sync_pt_info *info = data;
|
|
int ret;
|
|
|
|
if (size < sizeof(struct sync_pt_info))
|
|
return -ENOMEM;
|
|
|
|
info->len = sizeof(struct sync_pt_info);
|
|
|
|
if (fence->ops->fill_driver_data) {
|
|
ret = fence->ops->fill_driver_data(fence, info->driver_data,
|
|
size - sizeof(*info));
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
info->len += ret;
|
|
}
|
|
|
|
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);
|
|
|
|
return info->len;
|
|
}
|
|
|
|
static long sync_fence_ioctl_fence_info(struct sync_fence *fence,
|
|
unsigned long arg)
|
|
{
|
|
struct sync_fence_info_data *data;
|
|
__u32 size;
|
|
__u32 len = 0;
|
|
int ret, i;
|
|
|
|
if (copy_from_user(&size, (void __user *)arg, sizeof(size)))
|
|
return -EFAULT;
|
|
|
|
if (size < sizeof(struct sync_fence_info_data))
|
|
return -EINVAL;
|
|
|
|
if (size > 4096)
|
|
size = 4096;
|
|
|
|
data = kzalloc(size, GFP_KERNEL);
|
|
if (data == NULL)
|
|
return -ENOMEM;
|
|
|
|
strlcpy(data->name, fence->name, sizeof(data->name));
|
|
data->status = atomic_read(&fence->status);
|
|
if (data->status >= 0)
|
|
data->status = !data->status;
|
|
|
|
len = sizeof(struct sync_fence_info_data);
|
|
|
|
for (i = 0; i < fence->num_fences; ++i) {
|
|
struct fence *pt = fence->cbs[i].sync_pt;
|
|
|
|
ret = sync_fill_pt_info(pt, (u8 *)data + len, size - len);
|
|
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
len += ret;
|
|
}
|
|
|
|
data->len = len;
|
|
|
|
if (copy_to_user((void __user *)arg, data, len))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = 0;
|
|
|
|
out:
|
|
kfree(data);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static long sync_fence_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct sync_fence *fence = file->private_data;
|
|
|
|
switch (cmd) {
|
|
case SYNC_IOC_WAIT:
|
|
return sync_fence_ioctl_wait(fence, arg);
|
|
|
|
case SYNC_IOC_MERGE:
|
|
return sync_fence_ioctl_merge(fence, arg);
|
|
|
|
case SYNC_IOC_FENCE_INFO:
|
|
return sync_fence_ioctl_fence_info(fence, arg);
|
|
|
|
default:
|
|
return -ENOTTY;
|
|
}
|
|
}
|
|
|
|
static const struct file_operations sync_fence_fops = {
|
|
.release = sync_fence_release,
|
|
.poll = sync_fence_poll,
|
|
.unlocked_ioctl = sync_fence_ioctl,
|
|
.compat_ioctl = sync_fence_ioctl,
|
|
};
|
|
|