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e7d4c1c5a5
The virtio specifications allows for up to 128 bits for the device features. Soon we are going to use some of the 'extended' bits features (above 64) for the virtio_net driver. Introduce extended features as a fixed size array of u64. To minimize the diffstat allows legacy driver to access the low 64 bits via a transparent union. Introduce an extended get_extended_features configuration callback that devices supporting the extended features range must implement in place of the traditional one. Note that legacy and transport features don't need any change, as they are always in the low 64 bit range. Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
117 lines
3.3 KiB
C
117 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#include <linux/virtio.h>
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#include <linux/virtio_config.h>
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#include <linux/debugfs.h>
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static struct dentry *virtio_debugfs_dir;
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static int virtio_debug_device_features_show(struct seq_file *s, void *data)
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{
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u64 device_features[VIRTIO_FEATURES_DWORDS];
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struct virtio_device *dev = s->private;
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unsigned int i;
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virtio_get_features(dev, device_features);
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for (i = 0; i < VIRTIO_FEATURES_MAX; i++) {
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if (virtio_features_test_bit(device_features, i))
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seq_printf(s, "%u\n", i);
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}
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(virtio_debug_device_features);
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static int virtio_debug_filter_features_show(struct seq_file *s, void *data)
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{
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struct virtio_device *dev = s->private;
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unsigned int i;
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for (i = 0; i < VIRTIO_FEATURES_MAX; i++) {
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if (virtio_features_test_bit(dev->debugfs_filter_features, i))
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seq_printf(s, "%u\n", i);
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}
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(virtio_debug_filter_features);
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static int virtio_debug_filter_features_clear(void *data, u64 val)
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{
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struct virtio_device *dev = data;
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if (val == 1)
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virtio_features_zero(dev->debugfs_filter_features);
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return 0;
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}
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DEFINE_DEBUGFS_ATTRIBUTE(virtio_debug_filter_features_clear_fops, NULL,
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virtio_debug_filter_features_clear, "%llu\n");
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static int virtio_debug_filter_feature_add(void *data, u64 val)
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{
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struct virtio_device *dev = data;
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if (val >= VIRTIO_FEATURES_MAX)
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return -EINVAL;
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virtio_features_set_bit(dev->debugfs_filter_features, val);
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return 0;
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}
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DEFINE_DEBUGFS_ATTRIBUTE(virtio_debug_filter_feature_add_fops, NULL,
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virtio_debug_filter_feature_add, "%llu\n");
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static int virtio_debug_filter_feature_del(void *data, u64 val)
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{
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struct virtio_device *dev = data;
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if (val >= VIRTIO_FEATURES_MAX)
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return -EINVAL;
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virtio_features_clear_bit(dev->debugfs_filter_features, val);
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return 0;
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}
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DEFINE_DEBUGFS_ATTRIBUTE(virtio_debug_filter_feature_del_fops, NULL,
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virtio_debug_filter_feature_del, "%llu\n");
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void virtio_debug_device_init(struct virtio_device *dev)
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{
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dev->debugfs_dir = debugfs_create_dir(dev_name(&dev->dev),
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virtio_debugfs_dir);
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debugfs_create_file("device_features", 0400, dev->debugfs_dir, dev,
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&virtio_debug_device_features_fops);
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debugfs_create_file("filter_features", 0400, dev->debugfs_dir, dev,
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&virtio_debug_filter_features_fops);
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debugfs_create_file("filter_features_clear", 0200, dev->debugfs_dir, dev,
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&virtio_debug_filter_features_clear_fops);
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debugfs_create_file("filter_feature_add", 0200, dev->debugfs_dir, dev,
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&virtio_debug_filter_feature_add_fops);
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debugfs_create_file("filter_feature_del", 0200, dev->debugfs_dir, dev,
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&virtio_debug_filter_feature_del_fops);
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}
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EXPORT_SYMBOL_GPL(virtio_debug_device_init);
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void virtio_debug_device_filter_features(struct virtio_device *dev)
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{
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virtio_features_andnot(dev->features_array, dev->features_array,
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dev->debugfs_filter_features);
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}
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EXPORT_SYMBOL_GPL(virtio_debug_device_filter_features);
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void virtio_debug_device_exit(struct virtio_device *dev)
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{
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debugfs_remove_recursive(dev->debugfs_dir);
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}
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EXPORT_SYMBOL_GPL(virtio_debug_device_exit);
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void virtio_debug_init(void)
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{
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virtio_debugfs_dir = debugfs_create_dir("virtio", NULL);
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}
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EXPORT_SYMBOL_GPL(virtio_debug_init);
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void virtio_debug_exit(void)
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{
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debugfs_remove_recursive(virtio_debugfs_dir);
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}
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EXPORT_SYMBOL_GPL(virtio_debug_exit);
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