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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118// SPDX-License-Identifier: GPL-2.0-or-later
#include <linux/virtio.h>#include <linux/virtio_config.h>#include <linux/debugfs.h>
static struct dentry *virtio_debugfs_dir;
static int virtio_debug_device_features_show(struct seq_file *s, void *data){ u64 device_features[VIRTIO_FEATURES_U64S]; struct virtio_device *dev = s->private; unsigned int i;
virtio_get_features(dev, device_features); for (i = 0; i < VIRTIO_FEATURES_BITS; i++) { if (virtio_features_test_bit(device_features, i)) seq_printf(s, "%u\n", i); } return 0;}DEFINE_SHOW_ATTRIBUTE(virtio_debug_device_features);
static int virtio_debug_filter_features_show(struct seq_file *s, void *data){ struct virtio_device *dev = s->private; unsigned int i;
for (i = 0; i < VIRTIO_FEATURES_BITS; i++) { if (virtio_features_test_bit(dev->debugfs_filter_features, i)) seq_printf(s, "%u\n", i); } return 0;}DEFINE_SHOW_ATTRIBUTE(virtio_debug_filter_features);
static int virtio_debug_filter_features_clear(void *data, u64 val){ struct virtio_device *dev = data;
if (val == 1) virtio_features_zero(dev->debugfs_filter_features); return 0;}
DEFINE_DEBUGFS_ATTRIBUTE(virtio_debug_filter_features_clear_fops, NULL, virtio_debug_filter_features_clear, "%llu\n");
static int virtio_debug_filter_feature_add(void *data, u64 val){ struct virtio_device *dev = data;
if (val >= VIRTIO_FEATURES_BITS) return -EINVAL;
virtio_features_set_bit(dev->debugfs_filter_features, val); return 0;}
DEFINE_DEBUGFS_ATTRIBUTE(virtio_debug_filter_feature_add_fops, NULL, virtio_debug_filter_feature_add, "%llu\n");
static int virtio_debug_filter_feature_del(void *data, u64 val){ struct virtio_device *dev = data;
if (val >= VIRTIO_FEATURES_BITS) return -EINVAL;
virtio_features_clear_bit(dev->debugfs_filter_features, val); return 0;}
DEFINE_DEBUGFS_ATTRIBUTE(virtio_debug_filter_feature_del_fops, NULL, virtio_debug_filter_feature_del, "%llu\n");
void virtio_debug_device_init(struct virtio_device *dev){ dev->debugfs_dir = debugfs_create_dir(dev_name(&dev->dev), virtio_debugfs_dir); debugfs_create_file("device_features", 0400, dev->debugfs_dir, dev, &virtio_debug_device_features_fops); debugfs_create_file("filter_features", 0400, dev->debugfs_dir, dev, &virtio_debug_filter_features_fops); debugfs_create_file("filter_features_clear", 0200, dev->debugfs_dir, dev, &virtio_debug_filter_features_clear_fops); debugfs_create_file("filter_feature_add", 0200, dev->debugfs_dir, dev, &virtio_debug_filter_feature_add_fops); debugfs_create_file("filter_feature_del", 0200, dev->debugfs_dir, dev, &virtio_debug_filter_feature_del_fops);}EXPORT_SYMBOL_GPL(virtio_debug_device_init);
void virtio_debug_device_filter_features(struct virtio_device *dev){ virtio_features_andnot(dev->features_array, dev->features_array, dev->debugfs_filter_features);}EXPORT_SYMBOL_GPL(virtio_debug_device_filter_features);
void virtio_debug_device_exit(struct virtio_device *dev){ debugfs_remove_recursive(dev->debugfs_dir);}EXPORT_SYMBOL_GPL(virtio_debug_device_exit);
void virtio_debug_init(void){ virtio_debugfs_dir = debugfs_create_dir("virtio", NULL);}EXPORT_SYMBOL_GPL(virtio_debug_init);
void virtio_debug_exit(void){ debugfs_remove_recursive(virtio_debugfs_dir);}EXPORT_SYMBOL_GPL(virtio_debug_exit);