1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Debugfs tracing for bitstream buffers. This is similar to VA-API's
4 * LIBVA_TRACE_BUFDATA in that the raw bitstream can be dumped as a debugging
5 * aid.
6 *
7 * Produces one file per OUTPUT buffer. Files are automatically cleared on
8 * STREAMOFF unless the module parameter "keep_bitstream_buffers" is set.
9 */
10
11#include <linux/debugfs.h>
12#include <linux/list.h>
13#include <linux/mutex.h>
14#include <media/v4l2-mem2mem.h>
15
16#include "visl-debugfs.h"
17
18int visl_debugfs_init(struct visl_dev *dev)
19{
20 dev->debugfs_root = debugfs_create_dir(name: "visl", NULL);
21 INIT_LIST_HEAD(list: &dev->bitstream_blobs);
22 mutex_init(&dev->bitstream_lock);
23
24 if (IS_ERR(ptr: dev->debugfs_root))
25 return PTR_ERR(ptr: dev->debugfs_root);
26
27 return visl_debugfs_bitstream_init(dev);
28}
29
30int visl_debugfs_bitstream_init(struct visl_dev *dev)
31{
32 dev->bitstream_debugfs = debugfs_create_dir(name: "bitstream",
33 parent: dev->debugfs_root);
34 if (IS_ERR(ptr: dev->bitstream_debugfs))
35 return PTR_ERR(ptr: dev->bitstream_debugfs);
36
37 return 0;
38}
39
40void visl_trace_bitstream(struct visl_ctx *ctx, struct visl_run *run)
41{
42 u8 *vaddr = vb2_plane_vaddr(vb: &run->src->vb2_buf, plane_no: 0);
43 struct visl_blob *blob;
44 size_t data_sz = vb2_get_plane_payload(vb: &run->src->vb2_buf, plane_no: 0);
45 struct dentry *dentry;
46 char name[32];
47
48 blob = kzalloc(size: sizeof(*blob), GFP_KERNEL);
49 if (!blob)
50 return;
51
52 blob->blob.data = vzalloc(size: data_sz);
53 if (!blob->blob.data)
54 goto err_vmalloc;
55
56 blob->blob.size = data_sz;
57 snprintf(buf: name, size: 32, fmt: "bitstream%d", run->src->sequence);
58
59 memcpy(blob->blob.data, vaddr, data_sz);
60
61 dentry = debugfs_create_blob(name, mode: 0444, parent: ctx->dev->bitstream_debugfs,
62 blob: &blob->blob);
63 if (IS_ERR(ptr: dentry))
64 goto err_debugfs;
65
66 blob->dentry = dentry;
67
68 mutex_lock(&ctx->dev->bitstream_lock);
69 list_add_tail(new: &blob->list, head: &ctx->dev->bitstream_blobs);
70 mutex_unlock(lock: &ctx->dev->bitstream_lock);
71
72 return;
73
74err_debugfs:
75 vfree(addr: blob->blob.data);
76err_vmalloc:
77 kfree(objp: blob);
78}
79
80void visl_debugfs_clear_bitstream(struct visl_dev *dev)
81{
82 struct visl_blob *blob;
83 struct visl_blob *tmp;
84
85 mutex_lock(&dev->bitstream_lock);
86 if (list_empty(head: &dev->bitstream_blobs))
87 goto unlock;
88
89 list_for_each_entry_safe(blob, tmp, &dev->bitstream_blobs, list) {
90 list_del(entry: &blob->list);
91 debugfs_remove(dentry: blob->dentry);
92 vfree(addr: blob->blob.data);
93 kfree(objp: blob);
94 }
95
96unlock:
97 mutex_unlock(lock: &dev->bitstream_lock);
98}
99
100void visl_debugfs_bitstream_deinit(struct visl_dev *dev)
101{
102 visl_debugfs_clear_bitstream(dev);
103 debugfs_remove_recursive(dentry: dev->bitstream_debugfs);
104 dev->bitstream_debugfs = NULL;
105}
106
107void visl_debugfs_deinit(struct visl_dev *dev)
108{
109 visl_debugfs_bitstream_deinit(dev);
110 debugfs_remove_recursive(dentry: dev->debugfs_root);
111 dev->debugfs_root = NULL;
112}
113

source code of linux/drivers/media/test-drivers/visl/visl-debugfs.c