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 11 static struct dentry *dbgfs; 12 13 static LIST_HEAD(sync_timeline_list_head); 14 static DEFINE_SPINLOCK(sync_timeline_list_lock); 15 static LIST_HEAD(sync_file_list_head); 16 static DEFINE_SPINLOCK(sync_file_list_lock); 17 18 void sync_timeline_debug_add(struct sync_timeline *obj) 19 { 20 unsigned long flags; 21 22 spin_lock_irqsave(&sync_timeline_list_lock, flags); 23 list_add_tail(&obj->sync_timeline_list, &sync_timeline_list_head); 24 spin_unlock_irqrestore(&sync_timeline_list_lock, flags); 25 } 26 27 void sync_timeline_debug_remove(struct sync_timeline *obj) 28 { 29 unsigned long flags; 30 31 spin_lock_irqsave(&sync_timeline_list_lock, flags); 32 list_del(&obj->sync_timeline_list); 33 spin_unlock_irqrestore(&sync_timeline_list_lock, flags); 34 } 35 36 void sync_file_debug_add(struct sync_file *sync_file) 37 { 38 unsigned long flags; 39 40 spin_lock_irqsave(&sync_file_list_lock, flags); 41 list_add_tail(&sync_file->sync_file_list, &sync_file_list_head); 42 spin_unlock_irqrestore(&sync_file_list_lock, flags); 43 } 44 45 void sync_file_debug_remove(struct sync_file *sync_file) 46 { 47 unsigned long flags; 48 49 spin_lock_irqsave(&sync_file_list_lock, flags); 50 list_del(&sync_file->sync_file_list); 51 spin_unlock_irqrestore(&sync_file_list_lock, flags); 52 } 53 54 static const char *sync_status_str(int status) 55 { 56 if (status < 0) 57 return "error"; 58 59 if (status > 0) 60 return "signaled"; 61 62 return "active"; 63 } 64 65 static void sync_print_fence(struct seq_file *s, 66 struct dma_fence *fence, bool show) 67 { 68 struct sync_timeline *parent = dma_fence_parent(fence); 69 int status; 70 71 status = dma_fence_get_status_locked(fence); 72 73 seq_printf(s, " %s%sfence %s", 74 show ? parent->name : "", 75 show ? "_" : "", 76 sync_status_str(status)); 77 78 if (test_bit(DMA_FENCE_FLAG_TIMESTAMP_BIT, &fence->flags)) { 79 struct timespec64 ts64 = 80 ktime_to_timespec64(fence->timestamp); 81 82 seq_printf(s, "@%lld.%09ld", (s64)ts64.tv_sec, ts64.tv_nsec); 83 } 84 85 if (fence->ops->timeline_value_str && 86 fence->ops->fence_value_str) { 87 char value[64]; 88 bool success; 89 90 fence->ops->fence_value_str(fence, value, sizeof(value)); 91 success = strlen(value); 92 93 if (success) { 94 seq_printf(s, ": %s", value); 95 96 fence->ops->timeline_value_str(fence, value, 97 sizeof(value)); 98 99 if (strlen(value)) 100 seq_printf(s, " / %s", value); 101 } 102 } 103 104 seq_putc(s, '\n'); 105 } 106 107 static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj) 108 { 109 struct list_head *pos; 110 111 seq_printf(s, "%s: %d\n", obj->name, obj->value); 112 113 spin_lock(&obj->lock); /* Caller already disabled IRQ. */ 114 list_for_each(pos, &obj->pt_list) { 115 struct sync_pt *pt = container_of(pos, struct sync_pt, link); 116 sync_print_fence(s, &pt->base, false); 117 } 118 spin_unlock(&obj->lock); 119 } 120 121 static void sync_print_sync_file(struct seq_file *s, 122 struct sync_file *sync_file) 123 { 124 char buf[128]; 125 int i; 126 127 seq_printf(s, "[%p] %s: %s\n", sync_file, 128 sync_file_get_name(sync_file, buf, sizeof(buf)), 129 sync_status_str(dma_fence_get_status(sync_file->fence))); 130 131 if (dma_fence_is_array(sync_file->fence)) { 132 struct dma_fence_array *array = to_dma_fence_array(sync_file->fence); 133 134 for (i = 0; i < array->num_fences; ++i) 135 sync_print_fence(s, array->fences[i], true); 136 } else { 137 sync_print_fence(s, sync_file->fence, true); 138 } 139 } 140 141 static int sync_info_debugfs_show(struct seq_file *s, void *unused) 142 { 143 struct list_head *pos; 144 145 seq_puts(s, "objs:\n--------------\n"); 146 147 spin_lock_irq(&sync_timeline_list_lock); 148 list_for_each(pos, &sync_timeline_list_head) { 149 struct sync_timeline *obj = 150 container_of(pos, struct sync_timeline, 151 sync_timeline_list); 152 153 sync_print_obj(s, obj); 154 seq_putc(s, '\n'); 155 } 156 spin_unlock_irq(&sync_timeline_list_lock); 157 158 seq_puts(s, "fences:\n--------------\n"); 159 160 spin_lock_irq(&sync_file_list_lock); 161 list_for_each(pos, &sync_file_list_head) { 162 struct sync_file *sync_file = 163 container_of(pos, struct sync_file, sync_file_list); 164 165 sync_print_sync_file(s, sync_file); 166 seq_putc(s, '\n'); 167 } 168 spin_unlock_irq(&sync_file_list_lock); 169 return 0; 170 } 171 172 DEFINE_SHOW_ATTRIBUTE(sync_info_debugfs); 173 174 static __init int sync_debugfs_init(void) 175 { 176 dbgfs = debugfs_create_dir("sync", NULL); 177 178 /* 179 * The debugfs files won't ever get removed and thus, there is 180 * no need to protect it against removal races. The use of 181 * debugfs_create_file_unsafe() is actually safe here. 182 */ 183 debugfs_create_file_unsafe("info", 0444, dbgfs, NULL, 184 &sync_info_debugfs_fops); 185 debugfs_create_file_unsafe("sw_sync", 0644, dbgfs, NULL, 186 &sw_sync_debugfs_fops); 187 188 return 0; 189 } 190 late_initcall(sync_debugfs_init); 191