Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 1 | /* |
| 2 | * drivers/base/sync.c |
| 3 | * |
| 4 | * Copyright (C) 2012 Google, Inc. |
| 5 | * |
| 6 | * This software is licensed under the terms of the GNU General Public |
| 7 | * License version 2, as published by the Free Software Foundation, and |
| 8 | * may be copied, distributed, and modified under those terms. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | */ |
| 16 | |
| 17 | #include <linux/debugfs.h> |
| 18 | #include <linux/export.h> |
| 19 | #include <linux/file.h> |
| 20 | #include <linux/fs.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/poll.h> |
| 23 | #include <linux/sched.h> |
| 24 | #include <linux/seq_file.h> |
| 25 | #include <linux/slab.h> |
| 26 | #include <linux/uaccess.h> |
| 27 | #include <linux/anon_inodes.h> |
Tapasweni Pathak | 353fdf1 | 2014-10-26 19:20:16 +0530 | [diff] [blame] | 28 | #include <linux/time64.h> |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 29 | #include "sync.h" |
| 30 | |
| 31 | #ifdef CONFIG_DEBUG_FS |
| 32 | |
| 33 | static LIST_HEAD(sync_timeline_list_head); |
| 34 | static DEFINE_SPINLOCK(sync_timeline_list_lock); |
| 35 | static LIST_HEAD(sync_fence_list_head); |
| 36 | static DEFINE_SPINLOCK(sync_fence_list_lock); |
| 37 | |
| 38 | void sync_timeline_debug_add(struct sync_timeline *obj) |
| 39 | { |
| 40 | unsigned long flags; |
| 41 | |
| 42 | spin_lock_irqsave(&sync_timeline_list_lock, flags); |
| 43 | list_add_tail(&obj->sync_timeline_list, &sync_timeline_list_head); |
| 44 | spin_unlock_irqrestore(&sync_timeline_list_lock, flags); |
| 45 | } |
| 46 | |
| 47 | void sync_timeline_debug_remove(struct sync_timeline *obj) |
| 48 | { |
| 49 | unsigned long flags; |
| 50 | |
| 51 | spin_lock_irqsave(&sync_timeline_list_lock, flags); |
| 52 | list_del(&obj->sync_timeline_list); |
| 53 | spin_unlock_irqrestore(&sync_timeline_list_lock, flags); |
| 54 | } |
| 55 | |
| 56 | void sync_fence_debug_add(struct sync_fence *fence) |
| 57 | { |
| 58 | unsigned long flags; |
| 59 | |
| 60 | spin_lock_irqsave(&sync_fence_list_lock, flags); |
| 61 | list_add_tail(&fence->sync_fence_list, &sync_fence_list_head); |
| 62 | spin_unlock_irqrestore(&sync_fence_list_lock, flags); |
| 63 | } |
| 64 | |
| 65 | void sync_fence_debug_remove(struct sync_fence *fence) |
| 66 | { |
| 67 | unsigned long flags; |
| 68 | |
| 69 | spin_lock_irqsave(&sync_fence_list_lock, flags); |
| 70 | list_del(&fence->sync_fence_list); |
| 71 | spin_unlock_irqrestore(&sync_fence_list_lock, flags); |
| 72 | } |
| 73 | |
| 74 | static const char *sync_status_str(int status) |
| 75 | { |
| 76 | if (status == 0) |
| 77 | return "signaled"; |
Peter Senna Tschudin | 9545135 | 2014-07-12 21:55:56 +0200 | [diff] [blame] | 78 | |
| 79 | if (status > 0) |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 80 | return "active"; |
Peter Senna Tschudin | 9545135 | 2014-07-12 21:55:56 +0200 | [diff] [blame] | 81 | |
| 82 | return "error"; |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 83 | } |
| 84 | |
| 85 | static void sync_print_pt(struct seq_file *s, struct sync_pt *pt, bool fence) |
| 86 | { |
| 87 | int status = 1; |
| 88 | struct sync_timeline *parent = sync_pt_parent(pt); |
| 89 | |
| 90 | if (fence_is_signaled_locked(&pt->base)) |
| 91 | status = pt->base.status; |
| 92 | |
| 93 | seq_printf(s, " %s%spt %s", |
| 94 | fence ? parent->name : "", |
| 95 | fence ? "_" : "", |
| 96 | sync_status_str(status)); |
| 97 | |
| 98 | if (status <= 0) { |
Steve Pennington | 0541cdf | 2014-12-24 09:33:02 -0600 | [diff] [blame] | 99 | struct timespec64 ts64 = |
| 100 | ktime_to_timespec64(pt->base.timestamp); |
Peter Senna Tschudin | 9545135 | 2014-07-12 21:55:56 +0200 | [diff] [blame] | 101 | |
Tapasweni Pathak | 353fdf1 | 2014-10-26 19:20:16 +0530 | [diff] [blame] | 102 | seq_printf(s, "@%lld.%09ld", (s64)ts64.tv_sec, ts64.tv_nsec); |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 103 | } |
| 104 | |
| 105 | if (parent->ops->timeline_value_str && |
| 106 | parent->ops->pt_value_str) { |
| 107 | char value[64]; |
Peter Senna Tschudin | 9545135 | 2014-07-12 21:55:56 +0200 | [diff] [blame] | 108 | |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 109 | parent->ops->pt_value_str(pt, value, sizeof(value)); |
| 110 | seq_printf(s, ": %s", value); |
| 111 | if (fence) { |
| 112 | parent->ops->timeline_value_str(parent, value, |
| 113 | sizeof(value)); |
| 114 | seq_printf(s, " / %s", value); |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | seq_puts(s, "\n"); |
| 119 | } |
| 120 | |
| 121 | static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj) |
| 122 | { |
| 123 | struct list_head *pos; |
| 124 | unsigned long flags; |
| 125 | |
| 126 | seq_printf(s, "%s %s", obj->name, obj->ops->driver_name); |
| 127 | |
| 128 | if (obj->ops->timeline_value_str) { |
| 129 | char value[64]; |
Peter Senna Tschudin | 9545135 | 2014-07-12 21:55:56 +0200 | [diff] [blame] | 130 | |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 131 | obj->ops->timeline_value_str(obj, value, sizeof(value)); |
| 132 | seq_printf(s, ": %s", value); |
| 133 | } |
| 134 | |
| 135 | seq_puts(s, "\n"); |
| 136 | |
| 137 | spin_lock_irqsave(&obj->child_list_lock, flags); |
| 138 | list_for_each(pos, &obj->child_list_head) { |
| 139 | struct sync_pt *pt = |
| 140 | container_of(pos, struct sync_pt, child_list); |
| 141 | sync_print_pt(s, pt, false); |
| 142 | } |
| 143 | spin_unlock_irqrestore(&obj->child_list_lock, flags); |
| 144 | } |
| 145 | |
| 146 | static void sync_print_fence(struct seq_file *s, struct sync_fence *fence) |
| 147 | { |
| 148 | wait_queue_t *pos; |
| 149 | unsigned long flags; |
| 150 | int i; |
| 151 | |
| 152 | seq_printf(s, "[%p] %s: %s\n", fence, fence->name, |
| 153 | sync_status_str(atomic_read(&fence->status))); |
| 154 | |
| 155 | for (i = 0; i < fence->num_fences; ++i) { |
| 156 | struct sync_pt *pt = |
| 157 | container_of(fence->cbs[i].sync_pt, |
| 158 | struct sync_pt, base); |
| 159 | |
| 160 | sync_print_pt(s, pt, true); |
| 161 | } |
| 162 | |
| 163 | spin_lock_irqsave(&fence->wq.lock, flags); |
| 164 | list_for_each_entry(pos, &fence->wq.task_list, task_list) { |
| 165 | struct sync_fence_waiter *waiter; |
| 166 | |
| 167 | if (pos->func != &sync_fence_wake_up_wq) |
| 168 | continue; |
| 169 | |
| 170 | waiter = container_of(pos, struct sync_fence_waiter, work); |
| 171 | |
| 172 | seq_printf(s, "waiter %pF\n", waiter->callback); |
| 173 | } |
| 174 | spin_unlock_irqrestore(&fence->wq.lock, flags); |
| 175 | } |
| 176 | |
| 177 | static int sync_debugfs_show(struct seq_file *s, void *unused) |
| 178 | { |
| 179 | unsigned long flags; |
| 180 | struct list_head *pos; |
| 181 | |
| 182 | seq_puts(s, "objs:\n--------------\n"); |
| 183 | |
| 184 | spin_lock_irqsave(&sync_timeline_list_lock, flags); |
| 185 | list_for_each(pos, &sync_timeline_list_head) { |
| 186 | struct sync_timeline *obj = |
| 187 | container_of(pos, struct sync_timeline, |
| 188 | sync_timeline_list); |
| 189 | |
| 190 | sync_print_obj(s, obj); |
| 191 | seq_puts(s, "\n"); |
| 192 | } |
| 193 | spin_unlock_irqrestore(&sync_timeline_list_lock, flags); |
| 194 | |
| 195 | seq_puts(s, "fences:\n--------------\n"); |
| 196 | |
| 197 | spin_lock_irqsave(&sync_fence_list_lock, flags); |
| 198 | list_for_each(pos, &sync_fence_list_head) { |
| 199 | struct sync_fence *fence = |
| 200 | container_of(pos, struct sync_fence, sync_fence_list); |
| 201 | |
| 202 | sync_print_fence(s, fence); |
| 203 | seq_puts(s, "\n"); |
| 204 | } |
| 205 | spin_unlock_irqrestore(&sync_fence_list_lock, flags); |
| 206 | return 0; |
| 207 | } |
| 208 | |
| 209 | static int sync_debugfs_open(struct inode *inode, struct file *file) |
| 210 | { |
| 211 | return single_open(file, sync_debugfs_show, inode->i_private); |
| 212 | } |
| 213 | |
| 214 | static const struct file_operations sync_debugfs_fops = { |
| 215 | .open = sync_debugfs_open, |
| 216 | .read = seq_read, |
| 217 | .llseek = seq_lseek, |
| 218 | .release = single_release, |
| 219 | }; |
| 220 | |
| 221 | static __init int sync_debugfs_init(void) |
| 222 | { |
| 223 | debugfs_create_file("sync", S_IRUGO, NULL, NULL, &sync_debugfs_fops); |
| 224 | return 0; |
| 225 | } |
| 226 | late_initcall(sync_debugfs_init); |
| 227 | |
| 228 | #define DUMP_CHUNK 256 |
| 229 | static char sync_dump_buf[64 * 1024]; |
| 230 | void sync_dump(void) |
| 231 | { |
| 232 | struct seq_file s = { |
| 233 | .buf = sync_dump_buf, |
| 234 | .size = sizeof(sync_dump_buf) - 1, |
| 235 | }; |
| 236 | int i; |
| 237 | |
| 238 | sync_debugfs_show(&s, NULL); |
| 239 | |
| 240 | for (i = 0; i < s.count; i += DUMP_CHUNK) { |
| 241 | if ((s.count - i) > DUMP_CHUNK) { |
| 242 | char c = s.buf[i + DUMP_CHUNK]; |
Peter Senna Tschudin | 9545135 | 2014-07-12 21:55:56 +0200 | [diff] [blame] | 243 | |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 244 | s.buf[i + DUMP_CHUNK] = 0; |
| 245 | pr_cont("%s", s.buf + i); |
| 246 | s.buf[i + DUMP_CHUNK] = c; |
| 247 | } else { |
| 248 | s.buf[s.count] = 0; |
| 249 | pr_cont("%s", s.buf + i); |
| 250 | } |
| 251 | } |
| 252 | } |
| 253 | |
| 254 | #endif |