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
7 static struct dentry *virtio_debugfs_dir;
8
virtio_debug_device_features_show(struct seq_file * s,void * data)9 static 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 }
22 DEFINE_SHOW_ATTRIBUTE(virtio_debug_device_features);
23
virtio_debug_filter_features_show(struct seq_file * s,void * data)24 static 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 }
35 DEFINE_SHOW_ATTRIBUTE(virtio_debug_filter_features);
36
virtio_debug_filter_features_clear(void * data,u64 val)37 static 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
46 DEFINE_DEBUGFS_ATTRIBUTE(virtio_debug_filter_features_clear_fops, NULL,
47 virtio_debug_filter_features_clear, "%llu\n");
48
virtio_debug_filter_feature_add(void * data,u64 val)49 static 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
59 DEFINE_DEBUGFS_ATTRIBUTE(virtio_debug_filter_feature_add_fops, NULL,
60 virtio_debug_filter_feature_add, "%llu\n");
61
virtio_debug_filter_feature_del(void * data,u64 val)62 static 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
72 DEFINE_DEBUGFS_ATTRIBUTE(virtio_debug_filter_feature_del_fops, NULL,
73 virtio_debug_filter_feature_del, "%llu\n");
74
virtio_debug_device_init(struct virtio_device * dev)75 void 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 }
90 EXPORT_SYMBOL_GPL(virtio_debug_device_init);
91
virtio_debug_device_filter_features(struct virtio_device * dev)92 void virtio_debug_device_filter_features(struct virtio_device *dev)
93 {
94 dev->features &= ~dev->debugfs_filter_features;
95 }
96 EXPORT_SYMBOL_GPL(virtio_debug_device_filter_features);
97
virtio_debug_device_exit(struct virtio_device * dev)98 void virtio_debug_device_exit(struct virtio_device *dev)
99 {
100 debugfs_remove_recursive(dev->debugfs_dir);
101 }
102 EXPORT_SYMBOL_GPL(virtio_debug_device_exit);
103
virtio_debug_init(void)104 void virtio_debug_init(void)
105 {
106 virtio_debugfs_dir = debugfs_create_dir("virtio", NULL);
107 }
108 EXPORT_SYMBOL_GPL(virtio_debug_init);
109
virtio_debug_exit(void)110 void virtio_debug_exit(void)
111 {
112 debugfs_remove_recursive(virtio_debugfs_dir);
113 }
114 EXPORT_SYMBOL_GPL(virtio_debug_exit);
115