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 struct virtio_device *dev = s->private;
12 u64 device_features;
13 unsigned int i;
14
15 device_features = dev->config->get_features(dev);
16 for (i = 0; i < BITS_PER_LONG_LONG; i++) {
17 if (device_features & (1ULL << 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 < BITS_PER_LONG_LONG; i++) {
30 if (dev->debugfs_filter_features & (1ULL << 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 dev->debugfs_filter_features = 0;
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 >= BITS_PER_LONG_LONG)
54 return -EINVAL;
55 dev->debugfs_filter_features |= BIT_ULL_MASK(val);
56 return 0;
57}
58
59DEFINE_DEBUGFS_ATTRIBUTE(virtio_debug_filter_feature_add_fops, NULL,
60 virtio_debug_filter_feature_add, "%llu\n");
61
62static int virtio_debug_filter_feature_del(void *data, u64 val)
63{
64 struct virtio_device *dev = data;
65
66 if (val >= BITS_PER_LONG_LONG)
67 return -EINVAL;
68 dev->debugfs_filter_features &= ~BIT_ULL_MASK(val);
69 return 0;
70}
71
72DEFINE_DEBUGFS_ATTRIBUTE(virtio_debug_filter_feature_del_fops, NULL,
73 virtio_debug_filter_feature_del, "%llu\n");
74
75void virtio_debug_device_init(struct virtio_device *dev)
76{
77 dev->debugfs_dir = debugfs_create_dir(dev_name(&dev->dev),
78 virtio_debugfs_dir);
79 debugfs_create_file("device_features", 0400, dev->debugfs_dir, dev,
80 &virtio_debug_device_features_fops);
81 debugfs_create_file("filter_features", 0400, dev->debugfs_dir, dev,
82 &virtio_debug_filter_features_fops);
83 debugfs_create_file("filter_features_clear", 0200, dev->debugfs_dir, dev,
84 &virtio_debug_filter_features_clear_fops);
85 debugfs_create_file("filter_feature_add", 0200, dev->debugfs_dir, dev,
86 &virtio_debug_filter_feature_add_fops);
87 debugfs_create_file("filter_feature_del", 0200, dev->debugfs_dir, dev,
88 &virtio_debug_filter_feature_del_fops);
89}
90EXPORT_SYMBOL_GPL(virtio_debug_device_init);
91
92void virtio_debug_device_filter_features(struct virtio_device *dev)
93{
94 dev->features &= ~dev->debugfs_filter_features;
95}
96EXPORT_SYMBOL_GPL(virtio_debug_device_filter_features);
97
98void virtio_debug_device_exit(struct virtio_device *dev)
99{
100 debugfs_remove_recursive(dev->debugfs_dir);
101}
102EXPORT_SYMBOL_GPL(virtio_debug_device_exit);
103
104void virtio_debug_init(void)
105{
106 virtio_debugfs_dir = debugfs_create_dir("virtio", NULL);
107}
108EXPORT_SYMBOL_GPL(virtio_debug_init);
109
110void virtio_debug_exit(void)
111{
112 debugfs_remove_recursive(virtio_debugfs_dir);
113}
114EXPORT_SYMBOL_GPL(virtio_debug_exit);