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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125// 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);
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);}
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, "@%ptSp", &ts64); }
seq_printf(s, ": %lld", fence->seqno); seq_printf(s, " / %d", parent->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(&obj->lock); /* Caller already disabled IRQ. */ 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(&obj->lock);}
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");
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);