Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-or-later
2
3#include <linux/virtio.h>
4#include <linux/virtio_config.h>
5#include <linux/debugfs.h>
6
7static struct dentry *virtio_debugfs_dir;
8
9static int virtio_debug_device_features_show(struct seq_file *s, void *data)
10{
11 u64 device_features[VIRTIO_FEATURES_U64S];
12 struct virtio_device *dev = s->private;
13 unsigned int i;
14
15 virtio_get_features(dev, device_features);
16 for (i = 0; i < VIRTIO_FEATURES_BITS; i++) {
17 if (virtio_features_test_bit(device_features, i))
18 seq_printf(s, "%u\n", i);
19 }
20 return 0;
21}
22DEFINE_SHOW_ATTRIBUTE(virtio_debug_device_features);
23
24static int virtio_debug_filter_features_show(struct seq_file *s, void *data)
25{
26 struct virtio_device *dev = s->private;
27 unsigned int i;
28
29 for (i = 0; i < VIRTIO_FEATURES_BITS; i++) {
30 if (virtio_features_test_bit(dev->debugfs_filter_features, i))
31 seq_printf(s, "%u\n", i);
32 }
33 return 0;
34}
35DEFINE_SHOW_ATTRIBUTE(virtio_debug_filter_features);
36
37static int virtio_debug_filter_features_clear(void *data, u64 val)
38{
39 struct virtio_device *dev = data;
40
41 if (val == 1)
42 virtio_features_zero(dev->debugfs_filter_features);
43 return 0;
44}
45
46DEFINE_DEBUGFS_ATTRIBUTE(virtio_debug_filter_features_clear_fops, NULL,
47 virtio_debug_filter_features_clear, "%llu\n");
48
49static int virtio_debug_filter_feature_add(void *data, u64 val)
50{
51 struct virtio_device *dev = data;
52
53 if (val >= VIRTIO_FEATURES_BITS)
54 return -EINVAL;
55
56 virtio_features_set_bit(dev->debugfs_filter_features, val);
57 return 0;
58}
59
60DEFINE_DEBUGFS_ATTRIBUTE(virtio_debug_filter_feature_add_fops, NULL,
61 virtio_debug_filter_feature_add, "%llu\n");
62
63static int virtio_debug_filter_feature_del(void *data, u64 val)
64{
65 struct virtio_device *dev = data;
66
67 if (val >= VIRTIO_FEATURES_BITS)
68 return -EINVAL;
69
70 virtio_features_clear_bit(dev->debugfs_filter_features, val);
71 return 0;
72}
73
74DEFINE_DEBUGFS_ATTRIBUTE(virtio_debug_filter_feature_del_fops, NULL,
75 virtio_debug_filter_feature_del, "%llu\n");
76
77void virtio_debug_device_init(struct virtio_device *dev)
78{
79 dev->debugfs_dir = debugfs_create_dir(dev_name(&dev->dev),
80 virtio_debugfs_dir);
81 debugfs_create_file("device_features", 0400, dev->debugfs_dir, dev,
82 &virtio_debug_device_features_fops);
83 debugfs_create_file("filter_features", 0400, dev->debugfs_dir, dev,
84 &virtio_debug_filter_features_fops);
85 debugfs_create_file("filter_features_clear", 0200, dev->debugfs_dir, dev,
86 &virtio_debug_filter_features_clear_fops);
87 debugfs_create_file("filter_feature_add", 0200, dev->debugfs_dir, dev,
88 &virtio_debug_filter_feature_add_fops);
89 debugfs_create_file("filter_feature_del", 0200, dev->debugfs_dir, dev,
90 &virtio_debug_filter_feature_del_fops);
91}
92EXPORT_SYMBOL_GPL(virtio_debug_device_init);
93
94void virtio_debug_device_filter_features(struct virtio_device *dev)
95{
96 virtio_features_andnot(dev->features_array, dev->features_array,
97 dev->debugfs_filter_features);
98}
99EXPORT_SYMBOL_GPL(virtio_debug_device_filter_features);
100
101void virtio_debug_device_exit(struct virtio_device *dev)
102{
103 debugfs_remove_recursive(dev->debugfs_dir);
104}
105EXPORT_SYMBOL_GPL(virtio_debug_device_exit);
106
107void virtio_debug_init(void)
108{
109 virtio_debugfs_dir = debugfs_create_dir("virtio", NULL);
110}
111EXPORT_SYMBOL_GPL(virtio_debug_init);
112
113void virtio_debug_exit(void)
114{
115 debugfs_remove_recursive(virtio_debugfs_dir);
116}
117EXPORT_SYMBOL_GPL(virtio_debug_exit);