| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Sync File validation framework and debug information |
| * |
| * Copyright (C) 2012 Google, Inc. |
| */ |
| |
| #include <linux/debugfs.h> |
| #include "sync_debug.h" |
| |
| static struct dentry *dbgfs; |
| |
| static LIST_HEAD(sync_timeline_list_head); |
| static DEFINE_SPINLOCK(sync_timeline_list_lock); |
| static LIST_HEAD(sync_file_list_head); |
| static DEFINE_SPINLOCK(sync_file_list_lock); |
| |
| void sync_timeline_debug_add(struct sync_timeline *obj) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&sync_timeline_list_lock, flags); |
| list_add_tail(&obj->sync_timeline_list, &sync_timeline_list_head); |
| spin_unlock_irqrestore(&sync_timeline_list_lock, flags); |
| } |
| |
| void sync_timeline_debug_remove(struct sync_timeline *obj) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&sync_timeline_list_lock, flags); |
| list_del(&obj->sync_timeline_list); |
| spin_unlock_irqrestore(&sync_timeline_list_lock, flags); |
| } |
| |
| void sync_file_debug_add(struct sync_file *sync_file) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&sync_file_list_lock, flags); |
| list_add_tail(&sync_file->sync_file_list, &sync_file_list_head); |
| spin_unlock_irqrestore(&sync_file_list_lock, flags); |
| } |
| |
| void sync_file_debug_remove(struct sync_file *sync_file) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&sync_file_list_lock, flags); |
| list_del(&sync_file->sync_file_list); |
| spin_unlock_irqrestore(&sync_file_list_lock, flags); |
| } |
| |
| static const char *sync_status_str(int status) |
| { |
| if (status < 0) |
| return "error"; |
| |
| if (status > 0) |
| return "signaled"; |
| |
| return "active"; |
| } |
| |
| static void sync_print_fence(struct seq_file *s, |
| struct dma_fence *fence, bool show) |
| { |
| struct sync_timeline *parent = dma_fence_parent(fence); |
| int status; |
| |
| status = dma_fence_get_status_locked(fence); |
| |
| seq_printf(s, " %s%sfence %s", |
| show ? parent->name : "", |
| show ? "_" : "", |
| sync_status_str(status)); |
| |
| if (test_bit(DMA_FENCE_FLAG_TIMESTAMP_BIT, &fence->flags)) { |
| struct timespec64 ts64 = |
| ktime_to_timespec64(fence->timestamp); |
| |
| seq_printf(s, "@%lld.%09ld", (s64)ts64.tv_sec, ts64.tv_nsec); |
| } |
| |
| if (fence->ops->timeline_value_str && |
| fence->ops->fence_value_str) { |
| char value[64]; |
| bool success; |
| |
| fence->ops->fence_value_str(fence, value, sizeof(value)); |
| success = strlen(value); |
| |
| if (success) { |
| seq_printf(s, ": %s", value); |
| |
| fence->ops->timeline_value_str(fence, value, |
| sizeof(value)); |
| |
| if (strlen(value)) |
| seq_printf(s, " / %s", value); |
| } |
| } |
| |
| seq_putc(s, '\n'); |
| } |
| |
| static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj) |
| { |
| struct list_head *pos; |
| |
| seq_printf(s, "%s: %d\n", obj->name, obj->value); |
| |
| spin_lock_irq(&obj->lock); |
| list_for_each(pos, &obj->pt_list) { |
| struct sync_pt *pt = container_of(pos, struct sync_pt, link); |
| sync_print_fence(s, &pt->base, false); |
| } |
| spin_unlock_irq(&obj->lock); |
| } |
| |
| static void sync_print_sync_file(struct seq_file *s, |
| struct sync_file *sync_file) |
| { |
| char buf[128]; |
| int i; |
| |
| seq_printf(s, "[%p] %s: %s\n", sync_file, |
| sync_file_get_name(sync_file, buf, sizeof(buf)), |
| sync_status_str(dma_fence_get_status(sync_file->fence))); |
| |
| if (dma_fence_is_array(sync_file->fence)) { |
| struct dma_fence_array *array = to_dma_fence_array(sync_file->fence); |
| |
| for (i = 0; i < array->num_fences; ++i) |
| sync_print_fence(s, array->fences[i], true); |
| } else { |
| sync_print_fence(s, sync_file->fence, true); |
| } |
| } |
| |
| static int sync_info_debugfs_show(struct seq_file *s, void *unused) |
| { |
| struct list_head *pos; |
| |
| seq_puts(s, "objs:\n--------------\n"); |
| |
| spin_lock_irq(&sync_timeline_list_lock); |
| list_for_each(pos, &sync_timeline_list_head) { |
| struct sync_timeline *obj = |
| container_of(pos, struct sync_timeline, |
| sync_timeline_list); |
| |
| sync_print_obj(s, obj); |
| seq_putc(s, '\n'); |
| } |
| spin_unlock_irq(&sync_timeline_list_lock); |
| |
| seq_puts(s, "fences:\n--------------\n"); |
| |
| spin_lock_irq(&sync_file_list_lock); |
| list_for_each(pos, &sync_file_list_head) { |
| struct sync_file *sync_file = |
| container_of(pos, struct sync_file, sync_file_list); |
| |
| sync_print_sync_file(s, sync_file); |
| seq_putc(s, '\n'); |
| } |
| spin_unlock_irq(&sync_file_list_lock); |
| return 0; |
| } |
| |
| DEFINE_SHOW_ATTRIBUTE(sync_info_debugfs); |
| |
| static __init int sync_debugfs_init(void) |
| { |
| dbgfs = debugfs_create_dir("sync", NULL); |
| |
| /* |
| * The debugfs files won't ever get removed and thus, there is |
| * no need to protect it against removal races. The use of |
| * debugfs_create_file_unsafe() is actually safe here. |
| */ |
| debugfs_create_file_unsafe("info", 0444, dbgfs, NULL, |
| &sync_info_debugfs_fops); |
| debugfs_create_file_unsafe("sw_sync", 0644, dbgfs, NULL, |
| &sw_sync_debugfs_fops); |
| |
| return 0; |
| } |
| late_initcall(sync_debugfs_init); |
| |
| #define DUMP_CHUNK 256 |
| static char sync_dump_buf[64 * 1024]; |
| void sync_dump(void) |
| { |
| struct seq_file s = { |
| .buf = sync_dump_buf, |
| .size = sizeof(sync_dump_buf) - 1, |
| }; |
| int i; |
| |
| sync_info_debugfs_show(&s, NULL); |
| |
| for (i = 0; i < s.count; i += DUMP_CHUNK) { |
| if ((s.count - i) > DUMP_CHUNK) { |
| char c = s.buf[i + DUMP_CHUNK]; |
| |
| s.buf[i + DUMP_CHUNK] = 0; |
| pr_cont("%s", s.buf + i); |
| s.buf[i + DUMP_CHUNK] = c; |
| } else { |
| s.buf[s.count] = 0; |
| pr_cont("%s", s.buf + i); |
| } |
| } |
| } |