Release 4.12 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%
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(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%
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(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
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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%
John Fastabend 2 0.58% 1 5.00%
Wanlong Gao 2 0.58% 2 10.00%
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%
Kay Sievers 2 1.44% 1 11.11%
John Fastabend 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

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Created with cregit.
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%
cregit-Linux how code gets into the kernel

Release 4.12 drivers/virtio/virtio.c

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