2007-10-22 03:03:36 +02:00
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#include <linux/virtio.h>
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#include <linux/spinlock.h>
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#include <linux/virtio_config.h>
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2011-07-03 22:20:30 +02:00
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#include <linux/module.h>
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2012-05-03 04:20:51 +02:00
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#include <linux/idr.h>
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2007-10-22 03:03:36 +02:00
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2008-05-30 22:09:42 +02:00
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/* Unique numbering for virtio devices. */
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2012-05-03 04:20:51 +02:00
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static DEFINE_IDA(virtio_index_ida);
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2008-05-30 22:09:42 +02:00
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2007-10-22 03:03:36 +02:00
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static ssize_t device_show(struct device *_d,
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struct device_attribute *attr, char *buf)
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{
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struct virtio_device *dev = container_of(_d,struct virtio_device,dev);
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2010-11-10 07:20:29 +01:00
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return sprintf(buf, "0x%04x\n", dev->id.device);
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2007-10-22 03:03:36 +02:00
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}
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static ssize_t vendor_show(struct device *_d,
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struct device_attribute *attr, char *buf)
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{
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struct virtio_device *dev = container_of(_d,struct virtio_device,dev);
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2010-11-10 07:20:29 +01:00
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return sprintf(buf, "0x%04x\n", dev->id.vendor);
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2007-10-22 03:03:36 +02:00
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}
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static ssize_t status_show(struct device *_d,
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struct device_attribute *attr, char *buf)
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{
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struct virtio_device *dev = container_of(_d,struct virtio_device,dev);
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2010-11-10 07:20:29 +01:00
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return sprintf(buf, "0x%08x\n", dev->config->get_status(dev));
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2007-10-22 03:03:36 +02:00
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}
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2007-10-22 03:03:39 +02:00
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static ssize_t modalias_show(struct device *_d,
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struct device_attribute *attr, char *buf)
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{
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struct virtio_device *dev = container_of(_d,struct virtio_device,dev);
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return sprintf(buf, "virtio:d%08Xv%08X\n",
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dev->id.device, dev->id.vendor);
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}
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2009-06-13 06:16:37 +02:00
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static ssize_t features_show(struct device *_d,
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struct device_attribute *attr, char *buf)
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{
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struct virtio_device *dev = container_of(_d, struct virtio_device, dev);
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unsigned int i;
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ssize_t len = 0;
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/* We actually represent this as a bitstring, as it could be
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* arbitrary length in future. */
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for (i = 0; i < ARRAY_SIZE(dev->features)*BITS_PER_LONG; i++)
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len += sprintf(buf+len, "%c",
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test_bit(i, dev->features) ? '1' : '0');
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len += sprintf(buf+len, "\n");
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return len;
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}
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2007-10-22 03:03:36 +02:00
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static struct device_attribute virtio_dev_attrs[] = {
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__ATTR_RO(device),
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__ATTR_RO(vendor),
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__ATTR_RO(status),
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2007-10-22 03:03:39 +02:00
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__ATTR_RO(modalias),
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2009-06-13 06:16:37 +02:00
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__ATTR_RO(features),
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2007-10-22 03:03:36 +02:00
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__ATTR_NULL
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};
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static inline int virtio_id_match(const struct virtio_device *dev,
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const struct virtio_device_id *id)
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{
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2009-05-26 15:46:10 +02:00
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if (id->device != dev->id.device && id->device != VIRTIO_DEV_ANY_ID)
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2007-10-22 03:03:36 +02:00
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return 0;
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2009-05-26 15:46:09 +02:00
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return id->vendor == VIRTIO_DEV_ANY_ID || id->vendor == dev->id.vendor;
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2007-10-22 03:03:36 +02:00
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}
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/* This looks through all the IDs a driver claims to support. If any of them
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* match, we return 1 and the kernel will call virtio_dev_probe(). */
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static int virtio_dev_match(struct device *_dv, struct device_driver *_dr)
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{
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unsigned int i;
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struct virtio_device *dev = container_of(_dv,struct virtio_device,dev);
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const struct virtio_device_id *ids;
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ids = container_of(_dr, struct virtio_driver, driver)->id_table;
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for (i = 0; ids[i].device; i++)
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if (virtio_id_match(dev, &ids[i]))
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return 1;
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return 0;
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}
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2007-10-22 03:03:39 +02:00
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static int virtio_uevent(struct device *_dv, struct kobj_uevent_env *env)
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{
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struct virtio_device *dev = container_of(_dv,struct virtio_device,dev);
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return add_uevent_var(env, "MODALIAS=virtio:d%08Xv%08X",
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dev->id.device, dev->id.vendor);
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}
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2007-10-22 03:03:36 +02:00
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static void add_status(struct virtio_device *dev, unsigned status)
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{
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dev->config->set_status(dev, dev->config->get_status(dev) | status);
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}
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2008-05-03 04:50:50 +02:00
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void virtio_check_driver_offered_feature(const struct virtio_device *vdev,
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unsigned int fbit)
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{
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unsigned int i;
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struct virtio_driver *drv = container_of(vdev->dev.driver,
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struct virtio_driver, driver);
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for (i = 0; i < drv->feature_table_size; i++)
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if (drv->feature_table[i] == fbit)
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return;
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BUG();
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}
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EXPORT_SYMBOL_GPL(virtio_check_driver_offered_feature);
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2007-10-22 03:03:36 +02:00
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static int virtio_dev_probe(struct device *_d)
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{
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2008-05-03 04:50:50 +02:00
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int err, i;
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2007-10-22 03:03:36 +02:00
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struct virtio_device *dev = container_of(_d,struct virtio_device,dev);
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struct virtio_driver *drv = container_of(dev->dev.driver,
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struct virtio_driver, driver);
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2008-05-03 04:50:50 +02:00
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u32 device_features;
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2007-10-22 03:03:36 +02:00
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2008-05-03 04:50:50 +02:00
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/* We have a driver! */
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2007-10-22 03:03:36 +02:00
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add_status(dev, VIRTIO_CONFIG_S_DRIVER);
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2008-05-03 04:50:50 +02:00
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/* Figure out what features the device supports. */
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device_features = dev->config->get_features(dev);
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/* Features supported by both device and driver into dev->features. */
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memset(dev->features, 0, sizeof(dev->features));
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for (i = 0; i < drv->feature_table_size; i++) {
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unsigned int f = drv->feature_table[i];
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BUG_ON(f >= 32);
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if (device_features & (1 << f))
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set_bit(f, dev->features);
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}
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2008-07-25 19:06:07 +02:00
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/* Transport features always preserved to pass to finalize_features. */
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2008-07-25 19:06:07 +02:00
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for (i = VIRTIO_TRANSPORT_F_START; i < VIRTIO_TRANSPORT_F_END; i++)
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if (device_features & (1 << i))
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set_bit(i, dev->features);
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2009-06-13 06:16:35 +02:00
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dev->config->finalize_features(dev);
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2007-10-22 03:03:36 +02:00
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err = drv->probe(dev);
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if (err)
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add_status(dev, VIRTIO_CONFIG_S_FAILED);
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2012-07-11 23:22:16 +02:00
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else {
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2008-06-15 15:20:50 +02:00
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add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK);
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2012-07-11 23:22:16 +02:00
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if (drv->scan)
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drv->scan(dev);
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}
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2009-06-13 06:16:35 +02:00
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2007-10-22 03:03:36 +02:00
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return err;
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}
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2007-11-19 17:20:42 +01:00
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static int virtio_dev_remove(struct device *_d)
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{
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struct virtio_device *dev = container_of(_d,struct virtio_device,dev);
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struct virtio_driver *drv = container_of(dev->dev.driver,
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struct virtio_driver, driver);
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drv->remove(dev);
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2008-02-05 05:50:03 +01:00
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/* Driver should have reset device. */
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BUG_ON(dev->config->get_status(dev));
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/* Acknowledge the device's existence again. */
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add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE);
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2007-11-19 17:20:42 +01:00
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return 0;
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}
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2008-06-13 14:46:40 +02:00
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static struct bus_type virtio_bus = {
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.name = "virtio",
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.match = virtio_dev_match,
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.dev_attrs = virtio_dev_attrs,
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.uevent = virtio_uevent,
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.probe = virtio_dev_probe,
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.remove = virtio_dev_remove,
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};
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2007-10-22 03:03:36 +02:00
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int register_virtio_driver(struct virtio_driver *driver)
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{
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2008-05-03 04:50:50 +02:00
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/* Catch this early. */
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BUG_ON(driver->feature_table_size && !driver->feature_table);
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2007-10-22 03:03:36 +02:00
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driver->driver.bus = &virtio_bus;
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return driver_register(&driver->driver);
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}
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EXPORT_SYMBOL_GPL(register_virtio_driver);
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void unregister_virtio_driver(struct virtio_driver *driver)
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{
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driver_unregister(&driver->driver);
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}
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EXPORT_SYMBOL_GPL(unregister_virtio_driver);
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int register_virtio_device(struct virtio_device *dev)
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{
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int err;
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dev->dev.bus = &virtio_bus;
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2008-05-30 22:09:42 +02:00
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/* Assign a unique device index and hence name. */
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2012-05-03 04:20:51 +02:00
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err = ida_simple_get(&virtio_index_ida, 0, 0, GFP_KERNEL);
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if (err < 0)
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goto out;
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dev->index = err;
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virtio: struct device - replace bus_id with dev_name(), dev_set_name()
This patch is part of a larger patch series which will remove
the "char bus_id[20]" name string from struct device. The device
name is managed in the kobject anyway, and without any size
limitation, and just needlessly copied into "struct device".
To set and read the device name dev_name(dev) and dev_set_name(dev)
must be used. If your code uses static kobjects, which it shouldn't
do, "const char *init_name" can be used to statically provide the
name the registered device should have. At registration time, the
init_name field is cleared, to enforce the use of dev_name(dev) to
access the device name at a later time.
We need to get rid of all occurrences of bus_id in the entire tree
to be able to enable the new interface. Please apply this patch,
and possibly convert any remaining remaining occurrences of bus_id.
We want to submit a patch to -next, which will remove bus_id from
"struct device", to find the remaining pieces to convert, and finally
switch over to the new api, which will remove the 20 bytes array
and does no longer have a size limitation.
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2008-12-30 16:25:56 +01:00
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dev_set_name(&dev->dev, "virtio%u", dev->index);
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2007-10-22 03:03:36 +02:00
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2008-02-05 05:50:03 +01:00
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/* We always start by resetting the device, in case a previous
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* driver messed it up. This also tests that code path a little. */
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dev->config->reset(dev);
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2007-10-22 03:03:36 +02:00
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/* Acknowledge that we've seen the device. */
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add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE);
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2009-06-13 06:16:35 +02:00
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INIT_LIST_HEAD(&dev->vqs);
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2007-10-22 03:03:36 +02:00
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/* device_register() causes the bus infrastructure to look for a
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* matching driver. */
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err = device_register(&dev->dev);
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2012-05-03 04:20:51 +02:00
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out:
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2007-10-22 03:03:36 +02:00
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if (err)
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add_status(dev, VIRTIO_CONFIG_S_FAILED);
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return err;
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}
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EXPORT_SYMBOL_GPL(register_virtio_device);
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void unregister_virtio_device(struct virtio_device *dev)
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{
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device_unregister(&dev->dev);
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2012-05-03 04:20:51 +02:00
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ida_simple_remove(&virtio_index_ida, dev->index);
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2007-10-22 03:03:36 +02:00
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}
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EXPORT_SYMBOL_GPL(unregister_virtio_device);
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static int virtio_init(void)
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{
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if (bus_register(&virtio_bus) != 0)
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panic("virtio bus registration failed");
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return 0;
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}
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2008-02-05 05:50:05 +01:00
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static void __exit virtio_exit(void)
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{
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bus_unregister(&virtio_bus);
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}
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2007-10-22 03:03:36 +02:00
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core_initcall(virtio_init);
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2008-02-05 05:50:05 +01:00
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module_exit(virtio_exit);
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MODULE_LICENSE("GPL");
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