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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Sync File validation framework and debug information4 *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);15static LIST_HEAD(sync_file_list_head);16static DEFINE_SPINLOCK(sync_file_list_lock);17 18void 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 27void 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 36void 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 45void 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 54static 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 65static 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 107static 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 121static 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 141static 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 172DEFINE_SHOW_ATTRIBUTE(sync_info_debugfs);173 174static __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 is180 * no need to protect it against removal races. The use of181 * 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}190late_initcall(sync_debugfs_init);191