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authorJiri Pirko <jiri@nvidia.com>2024-04-24 13:40:45 +0300
committerPaolo Abeni <pabeni@redhat.com>2024-04-26 14:26:53 +0300
commit96a8326d69fffd7e8c2eb737dc060d8009a33b39 (patch)
tree685dd3d5cb1f2753629b3cc538989961efe90b43 /drivers/virtio
parentfc48de77d69de9d453cae3bb911f016a4be1bbda (diff)
downloadlinux-96a8326d69fffd7e8c2eb737dc060d8009a33b39.tar.xz
virtio: add debugfs infrastructure to allow to debug virtio features
Currently there is no way for user to set what features the driver should obey or not, it is hard wired in the code. In order to be able to debug the device behavior in case some feature is disabled, introduce a debugfs infrastructure with couple of files allowing user to see what features the device advertises and to set filter for features used by driver. Example: $cat /sys/bus/virtio/devices/virtio0/features 1110010111111111111101010000110010000000100000000000000000000000 $ echo "5" >/sys/kernel/debug/virtio/virtio0/filter_feature_add $ cat /sys/kernel/debug/virtio/virtio0/filter_features 5 $ echo "virtio0" > /sys/bus/virtio/drivers/virtio_net/unbind $ echo "virtio0" > /sys/bus/virtio/drivers/virtio_net/bind $ cat /sys/bus/virtio/devices/virtio0/features 1110000111111111111101010000110010000000100000000000000000000000 Note that sysfs "features" now already exists, this patch does not touch it. Signed-off-by: Jiri Pirko <jiri@nvidia.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'drivers/virtio')
-rw-r--r--drivers/virtio/Kconfig10
-rw-r--r--drivers/virtio/Makefile1
-rw-r--r--drivers/virtio/virtio.c8
-rw-r--r--drivers/virtio/virtio_debug.c114
4 files changed, 133 insertions, 0 deletions
diff --git a/drivers/virtio/Kconfig b/drivers/virtio/Kconfig
index c17193544268..6284538a8184 100644
--- a/drivers/virtio/Kconfig
+++ b/drivers/virtio/Kconfig
@@ -178,4 +178,14 @@ config VIRTIO_DMA_SHARED_BUFFER
This option adds a flavor of dma buffers that are backed by
virtio resources.
+config VIRTIO_DEBUG
+ bool "Debug facilities"
+ depends on VIRTIO
+ help
+ Enable this to expose debug facilities over debugfs.
+ This allows to debug features, to see what features the device
+ advertises and to set filter for features used by driver.
+
+ If unsure, say N.
+
endif # VIRTIO_MENU
diff --git a/drivers/virtio/Makefile b/drivers/virtio/Makefile
index 73ace62af440..58b2b0489fc9 100644
--- a/drivers/virtio/Makefile
+++ b/drivers/virtio/Makefile
@@ -13,3 +13,4 @@ obj-$(CONFIG_VIRTIO_INPUT) += virtio_input.o
obj-$(CONFIG_VIRTIO_VDPA) += virtio_vdpa.o
obj-$(CONFIG_VIRTIO_MEM) += virtio_mem.o
obj-$(CONFIG_VIRTIO_DMA_SHARED_BUFFER) += virtio_dma_buf.o
+obj-$(CONFIG_VIRTIO_DEBUG) += virtio_debug.o
diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index 9510c551dce8..b968b2aa5f4d 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -274,6 +274,9 @@ static int virtio_dev_probe(struct device *_d)
else
dev->features = driver_features_legacy & device_features;
+ /* When debugging, user may filter some features by hand. */
+ virtio_debug_device_filter_features(dev);
+
/* Transport features always preserved to pass to finalize_features. */
for (i = VIRTIO_TRANSPORT_F_START; i < VIRTIO_TRANSPORT_F_END; i++)
if (device_features & (1ULL << i))
@@ -465,6 +468,8 @@ int register_virtio_device(struct virtio_device *dev)
/* Acknowledge that we've seen the device. */
virtio_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE);
+ virtio_debug_device_init(dev);
+
/*
* device_add() causes the bus infrastructure to look for a matching
* driver.
@@ -496,6 +501,7 @@ void unregister_virtio_device(struct virtio_device *dev)
int index = dev->index; /* save for after device release */
device_unregister(&dev->dev);
+ virtio_debug_device_exit(dev);
ida_free(&virtio_index_ida, index);
}
EXPORT_SYMBOL_GPL(unregister_virtio_device);
@@ -590,11 +596,13 @@ static int virtio_init(void)
{
if (bus_register(&virtio_bus) != 0)
panic("virtio bus registration failed");
+ virtio_debug_init();
return 0;
}
static void __exit virtio_exit(void)
{
+ virtio_debug_exit();
bus_unregister(&virtio_bus);
ida_destroy(&virtio_index_ida);
}
diff --git a/drivers/virtio/virtio_debug.c b/drivers/virtio/virtio_debug.c
new file mode 100644
index 000000000000..95c8fc7705bb
--- /dev/null
+++ b/drivers/virtio/virtio_debug.c
@@ -0,0 +1,114 @@
+// 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);