Release 4.14 drivers/virtio/virtio.c

Directory: drivers/virtio
#include <linux/virtio.h>
#include <linux/spinlock.h>
#include <linux/virtio_config.h>
#include <linux/module.h>
#include <linux/idr.h>
#include <uapi/linux/virtio_ids.h>

/* Unique numbering for virtio devices. */
static DEFINE_IDA(virtio_index_ida);



static ssize_t device_show(struct device *_d,
			   struct device_attribute *attr, char *buf)
{
	struct virtio_device *dev = dev_to_virtio(_d);
	return sprintf(buf, "0x%04x\n", dev->id.device);
}
Contributors
Person Tokens Prop Commits CommitProp
Rusty Russell 42 95.45% 1 33.33%
Stephen Hemminger 1 2.27% 1 33.33%
Wanlong Gao 1 2.27% 1 33.33%
Total 44 100.00% 3 100.00%

static DEVICE_ATTR_RO(device);



static ssize_t vendor_show(struct device *_d,
			   struct device_attribute *attr, char *buf)
{
	struct virtio_device *dev = dev_to_virtio(_d);
	return sprintf(buf, "0x%04x\n", dev->id.vendor);
}
Contributors
Person Tokens Prop Commits CommitProp
Rusty Russell 42 95.45% 1 33.33%
Wanlong Gao 1 2.27% 1 33.33%
Stephen Hemminger 1 2.27% 1 33.33%
Total 44 100.00% 3 100.00%

static DEVICE_ATTR_RO(vendor);



static ssize_t status_show(struct device *_d,
			   struct device_attribute *attr, char *buf)
{
	struct virtio_device *dev = dev_to_virtio(_d);
	return sprintf(buf, "0x%08x\n", dev->config->get_status(dev));
}
Contributors
Person Tokens Prop Commits CommitProp
Rusty Russell 45 95.74% 1 33.33%
Stephen Hemminger 1 2.13% 1 33.33%
Wanlong Gao 1 2.13% 1 33.33%
Total 47 100.00% 3 100.00%

static DEVICE_ATTR_RO(status);



static ssize_t modalias_show(struct device *_d,
			     struct device_attribute *attr, char *buf)
{
	struct virtio_device *dev = dev_to_virtio(_d);
	return sprintf(buf, "virtio:d%08Xv%08X\n",
		       dev->id.device, dev->id.vendor);
}
Contributors
Person Tokens Prop Commits CommitProp
Rusty Russell 49 98.00% 1 50.00%
Wanlong Gao 1 2.00% 1 50.00%
Total 50 100.00% 2 100.00%

static DEVICE_ATTR_RO(modalias);



static ssize_t features_show(struct device *_d,
			     struct device_attribute *attr, char *buf)
{
	struct virtio_device *dev = dev_to_virtio(_d);
	unsigned int i;
	ssize_t len = 0;

	/* We actually represent this as a bitstring, as it could be
         * arbitrary length in future. */
	for (i = 0; i < sizeof(dev->features)*8; i++)
		len += sprintf(buf+len, "%c",
			       __virtio_test_bit(dev, i) ? '1' : '0');
	len += sprintf(buf+len, "\n");
	return len;
}
Contributors
Person Tokens Prop Commits CommitProp
Rusty Russell 90 93.75% 1 33.33%
Michael S. Tsirkin 5 5.21% 1 33.33%
Wanlong Gao 1 1.04% 1 33.33%
Total 96 100.00% 3 100.00%

static DEVICE_ATTR_RO(features);


static struct attribute *virtio_dev_attrs[] = {
	&dev_attr_device.attr,
	&dev_attr_vendor.attr,
	&dev_attr_status.attr,
	&dev_attr_modalias.attr,
	&dev_attr_features.attr,
	NULL,
};

ATTRIBUTE_GROUPS(virtio_dev);



static inline int virtio_id_match(const struct virtio_device *dev,
				  const struct virtio_device_id *id)
{
	if (id->device != dev->id.device && id->device != VIRTIO_DEV_ANY_ID)
		return 0;

	return id->vendor == VIRTIO_DEV_ANY_ID || id->vendor == dev->id.vendor;
}

Contributors
Person Tokens Prop Commits CommitProp
Rusty Russell 50 87.72% 1 33.33%
Christian Bornträger 7 12.28% 2 66.67%
Total 57 100.00% 3 100.00%

/* This looks through all the IDs a driver claims to support.  If any of them
 * match, we return 1 and the kernel will call virtio_dev_probe(). */


static int virtio_dev_match(struct device *_dv, struct device_driver *_dr)
{
	unsigned int i;
	struct virtio_device *dev = dev_to_virtio(_dv);
	const struct virtio_device_id *ids;

	ids = drv_to_virtio(_dr)->id_table;
	for (i = 0; ids[i].device; i++)
		if (virtio_id_match(dev, &ids[i]))
			return 1;
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Rusty Russell 78 97.50% 1 33.33%
Wanlong Gao 2 2.50% 2 66.67%
Total 80 100.00% 3 100.00%



static int virtio_uevent(struct device *_dv, struct kobj_uevent_env *env)
{
	struct virtio_device *dev = dev_to_virtio(_dv);

	return add_uevent_var(env, "MODALIAS=virtio:d%08Xv%08X",
			      dev->id.device, dev->id.vendor);
}

Contributors
Person Tokens Prop Commits CommitProp
Rusty Russell 45 97.83% 1 50.00%
Wanlong Gao 1 2.17% 1 50.00%
Total 46 100.00% 2 100.00%



void virtio_check_driver_offered_feature(const struct virtio_device *vdev,
					 unsigned int fbit)
{
	unsigned int i;
	struct virtio_driver *drv = drv_to_virtio(vdev->dev.driver);

	for (i = 0; i < drv->feature_table_size; i++)
		if (drv->feature_table[i] == fbit)
			return;

	if (drv->feature_table_legacy) {
		for (i = 0; i < drv->feature_table_size_legacy; i++)
			if (drv->feature_table_legacy[i] == fbit)
				return;
	}

	BUG();
}
Contributors
Person Tokens Prop Commits CommitProp
Rusty Russell 62 63.27% 1 33.33%
Michael S. Tsirkin 35 35.71% 1 33.33%
Wanlong Gao 1 1.02% 1 33.33%
Total 98 100.00% 3 100.00%


EXPORT_SYMBOL_GPL(virtio_check_driver_offered_feature);



static void __virtio_config_changed(struct virtio_device *dev)
{
	struct virtio_driver *drv = drv_to_virtio(dev->dev.driver);

	if (!dev->config_enabled)
		dev->config_change_pending = true;
	else if (drv && drv->config_changed)
		drv->config_changed(dev);
}

Contributors
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Michael S. Tsirkin 54 100.00% 1 100.00%
Total 54 100.00% 1 100.00%



void virtio_config_changed(struct virtio_device *dev)
{
	unsigned long flags;

	spin_lock_irqsave(&dev->config_lock, flags);
	__virtio_config_changed(dev);
	spin_unlock_irqrestore(&dev->config_lock, flags);
}
Contributors
Person Tokens Prop Commits CommitProp
Michael S. Tsirkin 39 100.00% 1 100.00%
Total 39 100.00% 1 100.00%


EXPORT_SYMBOL_GPL(virtio_config_changed);



void virtio_config_disable(struct virtio_device *dev)
{
	spin_lock_irq(&dev->config_lock);
	dev->config_enabled = false;
	spin_unlock_irq(&dev->config_lock);
}
Contributors
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Michael S. Tsirkin 32 100.00% 1 100.00%
Total 32 100.00% 1 100.00%


EXPORT_SYMBOL_GPL(virtio_config_disable);



void virtio_config_enable(struct virtio_device *dev)
{
	spin_lock_irq(&dev->config_lock);
	dev->config_enabled = true;
	if (dev->config_change_pending)
		__virtio_config_changed(dev);
	dev->config_change_pending = false;
	spin_unlock_irq(&dev->config_lock);
}
Contributors
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Michael S. Tsirkin 49 100.00% 1 100.00%
Total 49 100.00% 1 100.00%


EXPORT_SYMBOL_GPL(virtio_config_enable);



void virtio_add_status(struct virtio_device *dev, unsigned int status)
{
	dev->config->set_status(dev, dev->config->get_status(dev) | status);
}
Contributors
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John Fastabend 34 100.00% 1 100.00%
Total 34 100.00% 1 100.00%


EXPORT_SYMBOL_GPL(virtio_add_status);



int virtio_finalize_features(struct virtio_device *dev)
{
	int ret = dev->config->finalize_features(dev);
	unsigned status;

	if (ret)
		return ret;

	if (!virtio_has_feature(dev, VIRTIO_F_VERSION_1))
		return 0;

	virtio_add_status(dev, VIRTIO_CONFIG_S_FEATURES_OK);
	status = dev->config->get_status(dev);
	if (!(status & VIRTIO_CONFIG_S_FEATURES_OK)) {
		dev_err(&dev->dev, "virtio: device refuses features: %x\n",
			status);
		return -ENODEV;
	}
	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
Michael S. Tsirkin 92 98.92% 1 50.00%
John Fastabend 1 1.08% 1 50.00%
Total 93 100.00% 2 100.00%


EXPORT_SYMBOL_GPL(virtio_finalize_features);



static int virtio_dev_probe(struct device *_d)
{
	int err, i;
	struct virtio_device *dev = dev_to_virtio(_d);
	struct virtio_driver *drv = drv_to_virtio(dev->dev.driver);
	u64 device_features;
	u64 driver_features;
	u64 driver_features_legacy;

	/* We have a driver! */
	virtio_add_status(dev, VIRTIO_CONFIG_S_DRIVER);

	/* Figure out what features the device supports. */
	device_features = dev->config->get_features(dev);

	/* Figure out what features the driver supports. */
	driver_features = 0;
	for (i = 0; i < drv->feature_table_size; i++) {
		unsigned int f = drv->feature_table[i];
		BUG_ON(f >= 64);
		driver_features |= (1ULL << f);
	}

	/* Some drivers have a separate feature table for virtio v1.0 */
	if (drv->feature_table_legacy) {
		driver_features_legacy = 0;
		for (i = 0; i < drv->feature_table_size_legacy; i++) {
			unsigned int f = drv->feature_table_legacy[i];
			BUG_ON(f >= 64);
			driver_features_legacy |= (1ULL << f);
		}
	} else {
		driver_features_legacy = driver_features;
	}

	if (device_features & (1ULL << VIRTIO_F_VERSION_1))
		dev->features = driver_features & device_features;
	else
		dev->features = driver_features_legacy & device_features;

	/* 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))
			__virtio_set_bit(dev, i);

	if (drv->validate) {
		err = drv->validate(dev);
		if (err)
			goto err;
	}

	err = virtio_finalize_features(dev);
	if (err)
		goto err;

	err = drv->probe(dev);
	if (err)
		goto err;

	/* If probe didn't do it, mark device DRIVER_OK ourselves. */
	if (!(dev->config->get_status(dev) & VIRTIO_CONFIG_S_DRIVER_OK))
		virtio_device_ready(dev);

	if (drv->scan)
		drv->scan(dev);

	virtio_config_enable(dev);

	return 0;
err:
	virtio_add_status(dev, VIRTIO_CONFIG_S_FAILED);
	return err;

}

Contributors
Person Tokens Prop Commits CommitProp
Michael S. Tsirkin 174 50.14% 9 45.00%
Rusty Russell 151 43.52% 6 30.00%
Nicholas Bellinger 13 3.75% 1 5.00%
Mark McLoughlin 5 1.44% 1 5.00%
Wanlong Gao 2 0.58% 2 10.00%
John Fastabend 2 0.58% 1 5.00%
Total 347 100.00% 20 100.00%



static int virtio_dev_remove(struct device *_d)
{
	struct virtio_device *dev = dev_to_virtio(_d);
	struct virtio_driver *drv = drv_to_virtio(dev->dev.driver);

	virtio_config_disable(dev);

	drv->remove(dev);

	/* Driver should have reset device. */
	WARN_ON_ONCE(dev->config->get_status(dev));

	/* Acknowledge the device's existence again. */
	virtio_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Rusty Russell 62 87.32% 2 28.57%
Michael S. Tsirkin 6 8.45% 2 28.57%
Wanlong Gao 2 2.82% 2 28.57%
John Fastabend 1 1.41% 1 14.29%
Total 71 100.00% 7 100.00%


static struct bus_type virtio_bus = {
	.name  = "virtio",
	.match = virtio_dev_match,
	.dev_groups = virtio_dev_groups,
	.uevent = virtio_uevent,
	.probe = virtio_dev_probe,
	.remove = virtio_dev_remove,
};



int register_virtio_driver(struct virtio_driver *driver)
{
	/* Catch this early. */
	BUG_ON(driver->feature_table_size && !driver->feature_table);
	driver->driver.bus = &virtio_bus;
	return driver_register(&driver->driver);
}
Contributors
Person Tokens Prop Commits CommitProp
Rusty Russell 41 100.00% 2 100.00%
Total 41 100.00% 2 100.00%


EXPORT_SYMBOL_GPL(register_virtio_driver);



void unregister_virtio_driver(struct virtio_driver *driver)
{
	driver_unregister(&driver->driver);
}
Contributors
Person Tokens Prop Commits CommitProp
Rusty Russell 18 100.00% 1 100.00%
Total 18 100.00% 1 100.00%


EXPORT_SYMBOL_GPL(unregister_virtio_driver);



int register_virtio_device(struct virtio_device *dev)
{
	int err;

	dev->dev.bus = &virtio_bus;

	/* Assign a unique device index and hence name. */
	err = ida_simple_get(&virtio_index_ida, 0, 0, GFP_KERNEL);
	if (err < 0)
		goto out;

	dev->index = err;
	dev_set_name(&dev->dev, "virtio%u", dev->index);

	spin_lock_init(&dev->config_lock);
	dev->config_enabled = false;
	dev->config_change_pending = false;

	/* We always start by resetting the device, in case a previous
         * driver messed it up.  This also tests that code path a little. */
	dev->config->reset(dev);

	/* Acknowledge that we've seen the device. */
	virtio_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE);

	INIT_LIST_HEAD(&dev->vqs);

	/* device_register() causes the bus infrastructure to look for a
         * matching driver. */
	err = device_register(&dev->dev);
out:
	if (err)
		virtio_add_status(dev, VIRTIO_CONFIG_S_FAILED);
	return err;
}
Contributors
Person Tokens Prop Commits CommitProp
Rusty Russell 89 64.03% 5 55.56%
Asias He 26 18.71% 1 11.11%
Michael S. Tsirkin 20 14.39% 1 11.11%
John Fastabend 2 1.44% 1 11.11%
Kay Sievers 2 1.44% 1 11.11%
Total 139 100.00% 9 100.00%


EXPORT_SYMBOL_GPL(register_virtio_device);



void unregister_virtio_device(struct virtio_device *dev)
{
	int index = dev->index; /* save for after device release */

	device_unregister(&dev->dev);
	ida_simple_remove(&virtio_index_ida, index);
}
Contributors
Person Tokens Prop Commits CommitProp
Rusty Russell 18 52.94% 1 33.33%
Cornelia Huck 8 23.53% 1 33.33%
Asias He 8 23.53% 1 33.33%
Total 34 100.00% 3 100.00%


EXPORT_SYMBOL_GPL(unregister_virtio_device);

#ifdef CONFIG_PM_SLEEP


int virtio_device_freeze(struct virtio_device *dev)
{
	struct virtio_driver *drv = drv_to_virtio(dev->dev.driver);

	virtio_config_disable(dev);

	dev->failed = dev->config->get_status(dev) & VIRTIO_CONFIG_S_FAILED;

	if (drv && drv->freeze)
		return drv->freeze(dev);

	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
Michael S. Tsirkin 63 100.00% 2 100.00%
Total 63 100.00% 2 100.00%


EXPORT_SYMBOL_GPL(virtio_device_freeze);



int virtio_device_restore(struct virtio_device *dev)
{
	struct virtio_driver *drv = drv_to_virtio(dev->dev.driver);
	int ret;

	/* We always start by resetting the device, in case a previous
         * driver messed it up. */
	dev->config->reset(dev);

	/* Acknowledge that we've seen the device. */
	virtio_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE);

	/* Maybe driver failed before freeze.
         * Restore the failed status, for debugging. */
	if (dev->failed)
		virtio_add_status(dev, VIRTIO_CONFIG_S_FAILED);

	if (!drv)
		return 0;

	/* We have a driver! */
	virtio_add_status(dev, VIRTIO_CONFIG_S_DRIVER);

	ret = virtio_finalize_features(dev);
	if (ret)
		goto err;

	if (drv->restore) {
		ret = drv->restore(dev);
		if (ret)
			goto err;
	}

	/* Finally, tell the device we're all set */
	virtio_add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK);

	virtio_config_enable(dev);

	return 0;

err:
	virtio_add_status(dev, VIRTIO_CONFIG_S_FAILED);
	return ret;
}
Contributors
Person Tokens Prop Commits CommitProp
Michael S. Tsirkin 136 96.45% 4 80.00%
John Fastabend 5 3.55% 1 20.00%
Total 141 100.00% 5 100.00%


EXPORT_SYMBOL_GPL(virtio_device_restore);
#endif



static int virtio_init(void)
{
	if (bus_register(&virtio_bus) != 0)
		panic("virtio bus registration failed");
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Rusty Russell 26 100.00% 1 100.00%
Total 26 100.00% 1 100.00%



static void __exit virtio_exit(void)
{
	bus_unregister(&virtio_bus);
	ida_destroy(&virtio_index_ida);
}
Contributors
Person Tokens Prop Commits CommitProp
Rusty Russell 15 71.43% 1 50.00%
Suman Anna 6 28.57% 1 50.00%
Total 21 100.00% 2 100.00%


core_initcall(virtio_init);

module_exit(virtio_exit);

MODULE_LICENSE("GPL");
Overall Contributors
Person Tokens Prop Commits CommitProp
Rusty Russell 987 49.90% 14 34.15%
Michael S. Tsirkin 728 36.80% 12 29.27%
John Fastabend 65 3.29% 1 2.44%
Greg Kroah-Hartman 61 3.08% 1 2.44%
Asias He 42 2.12% 1 2.44%
Mark McLoughlin 40 2.02% 2 4.88%
Nicholas Bellinger 13 0.66% 1 2.44%
Wanlong Gao 13 0.66% 2 4.88%
Cornelia Huck 8 0.40% 1 2.44%
Christian Bornträger 7 0.35% 2 4.88%
Suman Anna 6 0.30% 1 2.44%
Paul Gortmaker 3 0.15% 1 2.44%
Stephen Hemminger 3 0.15% 1 2.44%
Kay Sievers 2 0.10% 1 2.44%
Total 1978 100.00% 41 100.00%
Directory: drivers/virtio

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Rusty Russell	42	95.45%	1	33.33%
Stephen Hemminger	1	2.27%	1	33.33%
Wanlong Gao	1	2.27%	1	33.33%
Total	44	100.00%	3	100.00%
cregit-Linux how code gets into the kernel

Release 4.14 drivers/virtio/virtio.c

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