1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Sync File validation framework and debug information
4 *
5 * Copyright (C) 2012 Google, Inc.
6 */
7
8#include <linux/debugfs.h>
9#include "sync_debug.h"
10
11static struct dentry *dbgfs;
12
13static LIST_HEAD(sync_timeline_list_head);
14static DEFINE_SPINLOCK(sync_timeline_list_lock);
15
16void sync_timeline_debug_add(struct sync_timeline *obj)
17{
18 unsigned long flags;
19
20 spin_lock_irqsave(&sync_timeline_list_lock, flags);
21 list_add_tail(new: &obj->sync_timeline_list, head: &sync_timeline_list_head);
22 spin_unlock_irqrestore(lock: &sync_timeline_list_lock, flags);
23}
24
25void sync_timeline_debug_remove(struct sync_timeline *obj)
26{
27 unsigned long flags;
28
29 spin_lock_irqsave(&sync_timeline_list_lock, flags);
30 list_del(entry: &obj->sync_timeline_list);
31 spin_unlock_irqrestore(lock: &sync_timeline_list_lock, flags);
32}
33
34static const char *sync_status_str(int status)
35{
36 if (status < 0)
37 return "error";
38
39 if (status > 0)
40 return "signaled";
41
42 return "active";
43}
44
45static void sync_print_fence(struct seq_file *s,
46 struct dma_fence *fence, bool show)
47{
48 struct sync_timeline *parent = dma_fence_parent(fence);
49 int status;
50
51 status = dma_fence_get_status_locked(fence);
52
53 seq_printf(m: s, fmt: " %s%sfence %s",
54 show ? parent->name : "",
55 show ? "_" : "",
56 sync_status_str(status));
57
58 if (test_bit(DMA_FENCE_FLAG_TIMESTAMP_BIT, &fence->flags)) {
59 struct timespec64 ts64 =
60 ktime_to_timespec64(fence->timestamp);
61
62 seq_printf(m: s, fmt: "@%ptSp", &ts64);
63 }
64
65 seq_printf(m: s, fmt: ": %lld", fence->seqno);
66 seq_printf(m: s, fmt: " / %d", parent->value);
67 seq_putc(m: s, c: '\n');
68}
69
70static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj)
71{
72 struct list_head *pos;
73
74 seq_printf(m: s, fmt: "%s: %d\n", obj->name, obj->value);
75
76 spin_lock(lock: &obj->lock); /* Caller already disabled IRQ. */
77 list_for_each(pos, &obj->pt_list) {
78 struct sync_pt *pt = container_of(pos, struct sync_pt, link);
79 sync_print_fence(s, fence: &pt->base, show: false);
80 }
81 spin_unlock(lock: &obj->lock);
82}
83
84static int sync_info_debugfs_show(struct seq_file *s, void *unused)
85{
86 struct list_head *pos;
87
88 seq_puts(m: s, s: "objs:\n--------------\n");
89
90 spin_lock_irq(lock: &sync_timeline_list_lock);
91 list_for_each(pos, &sync_timeline_list_head) {
92 struct sync_timeline *obj =
93 container_of(pos, struct sync_timeline,
94 sync_timeline_list);
95
96 sync_print_obj(s, obj);
97 seq_putc(m: s, c: '\n');
98 }
99 spin_unlock_irq(lock: &sync_timeline_list_lock);
100
101 seq_puts(m: s, s: "fences:\n--------------\n");
102
103 return 0;
104}
105
106DEFINE_SHOW_ATTRIBUTE(sync_info_debugfs);
107
108static __init int sync_debugfs_init(void)
109{
110 dbgfs = debugfs_create_dir(name: "sync", NULL);
111
112 /*
113 * The debugfs files won't ever get removed and thus, there is
114 * no need to protect it against removal races. The use of
115 * debugfs_create_file_unsafe() is actually safe here.
116 */
117 debugfs_create_file_unsafe(name: "info", mode: 0444, parent: dbgfs, NULL,
118 fops: &sync_info_debugfs_fops);
119 debugfs_create_file_unsafe(name: "sw_sync", mode: 0644, parent: dbgfs, NULL,
120 fops: &sw_sync_debugfs_fops);
121
122 return 0;
123}
124late_initcall(sync_debugfs_init);
125

source code of linux/drivers/dma-buf/sync_debug.c