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-rw-r--r--drivers/dma-buf/sync_debug.c190
1 files changed, 190 insertions, 0 deletions
diff --git a/drivers/dma-buf/sync_debug.c b/drivers/dma-buf/sync_debug.c
new file mode 100644
index 000000000..101394f16
--- /dev/null
+++ b/drivers/dma-buf/sync_debug.c
@@ -0,0 +1,190 @@
+// 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);