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// 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)
{
struct virtio_device *dev = s->private;
u64 device_features;
unsigned int i;
device_features = dev->config->get_features(dev);
for (i = 0; i < BITS_PER_LONG_LONG; i++) {
if (device_features & (1ULL << 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 < BITS_PER_LONG_LONG; i++) {
if (dev->debugfs_filter_features & (1ULL << 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)
dev->debugfs_filter_features = 0;
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 >= BITS_PER_LONG_LONG)
return -EINVAL;
dev->debugfs_filter_features |= BIT_ULL_MASK(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 >= BITS_PER_LONG_LONG)
return -EINVAL;
dev->debugfs_filter_features &= ~BIT_ULL_MASK(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)
{
dev->features &= ~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);
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