115 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2 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);115