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drivers/virtio/virtio.c
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#include <linux/virtio.h> #include <linux/spinlock.h> #include <linux/virtio_config.h> |
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#include <linux/module.h> |
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/* Unique numbering for virtio devices. */ static unsigned int dev_index; |
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static ssize_t device_show(struct device *_d, struct device_attribute *attr, char *buf) { struct virtio_device *dev = container_of(_d,struct virtio_device,dev); |
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return sprintf(buf, "0x%04x ", dev->id.device); |
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} static ssize_t vendor_show(struct device *_d, struct device_attribute *attr, char *buf) { struct virtio_device *dev = container_of(_d,struct virtio_device,dev); |
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return sprintf(buf, "0x%04x ", dev->id.vendor); |
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} static ssize_t status_show(struct device *_d, struct device_attribute *attr, char *buf) { struct virtio_device *dev = container_of(_d,struct virtio_device,dev); |
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return sprintf(buf, "0x%08x ", dev->config->get_status(dev)); |
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} |
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static ssize_t modalias_show(struct device *_d, struct device_attribute *attr, char *buf) { struct virtio_device *dev = container_of(_d,struct virtio_device,dev); return sprintf(buf, "virtio:d%08Xv%08X ", dev->id.device, dev->id.vendor); } |
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static ssize_t features_show(struct device *_d, struct device_attribute *attr, char *buf) { struct virtio_device *dev = container_of(_d, struct virtio_device, dev); 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 < ARRAY_SIZE(dev->features)*BITS_PER_LONG; i++) len += sprintf(buf+len, "%c", test_bit(i, dev->features) ? '1' : '0'); len += sprintf(buf+len, " "); return len; } |
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static struct device_attribute virtio_dev_attrs[] = { __ATTR_RO(device), __ATTR_RO(vendor), __ATTR_RO(status), |
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__ATTR_RO(modalias), |
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__ATTR_RO(features), |
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__ATTR_NULL }; static inline int virtio_id_match(const struct virtio_device *dev, const struct virtio_device_id *id) { |
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if (id->device != dev->id.device && id->device != VIRTIO_DEV_ANY_ID) |
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return 0; |
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return id->vendor == VIRTIO_DEV_ANY_ID || id->vendor == dev->id.vendor; |
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} /* 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 = container_of(_dv,struct virtio_device,dev); const struct virtio_device_id *ids; ids = container_of(_dr, struct virtio_driver, driver)->id_table; for (i = 0; ids[i].device; i++) if (virtio_id_match(dev, &ids[i])) return 1; return 0; } |
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static int virtio_uevent(struct device *_dv, struct kobj_uevent_env *env) { struct virtio_device *dev = container_of(_dv,struct virtio_device,dev); return add_uevent_var(env, "MODALIAS=virtio:d%08Xv%08X", dev->id.device, dev->id.vendor); } |
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static void add_status(struct virtio_device *dev, unsigned status) { dev->config->set_status(dev, dev->config->get_status(dev) | status); } |
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void virtio_check_driver_offered_feature(const struct virtio_device *vdev, unsigned int fbit) { unsigned int i; struct virtio_driver *drv = container_of(vdev->dev.driver, struct virtio_driver, driver); for (i = 0; i < drv->feature_table_size; i++) if (drv->feature_table[i] == fbit) return; BUG(); } EXPORT_SYMBOL_GPL(virtio_check_driver_offered_feature); |
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static int virtio_dev_probe(struct device *_d) { |
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int err, i; |
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struct virtio_device *dev = container_of(_d,struct virtio_device,dev); struct virtio_driver *drv = container_of(dev->dev.driver, struct virtio_driver, driver); |
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u32 device_features; |
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/* We have a driver! */ |
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add_status(dev, VIRTIO_CONFIG_S_DRIVER); |
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/* Figure out what features the device supports. */ device_features = dev->config->get_features(dev); /* Features supported by both device and driver into dev->features. */ memset(dev->features, 0, sizeof(dev->features)); for (i = 0; i < drv->feature_table_size; i++) { unsigned int f = drv->feature_table[i]; BUG_ON(f >= 32); if (device_features & (1 << f)) set_bit(f, dev->features); } |
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/* Transport features always preserved to pass to finalize_features. */ |
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for (i = VIRTIO_TRANSPORT_F_START; i < VIRTIO_TRANSPORT_F_END; i++) if (device_features & (1 << i)) set_bit(i, dev->features); |
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dev->config->finalize_features(dev); |
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err = drv->probe(dev); if (err) add_status(dev, VIRTIO_CONFIG_S_FAILED); |
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else |
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add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK); |
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return err; } |
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static int virtio_dev_remove(struct device *_d) { struct virtio_device *dev = container_of(_d,struct virtio_device,dev); struct virtio_driver *drv = container_of(dev->dev.driver, struct virtio_driver, driver); |
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drv->remove(dev); |
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/* Driver should have reset device. */ BUG_ON(dev->config->get_status(dev)); /* Acknowledge the device's existence again. */ add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE); |
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return 0; } |
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static struct bus_type virtio_bus = { .name = "virtio", .match = virtio_dev_match, .dev_attrs = virtio_dev_attrs, .uevent = virtio_uevent, .probe = virtio_dev_probe, .remove = virtio_dev_remove, }; |
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int register_virtio_driver(struct virtio_driver *driver) { |
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/* Catch this early. */ BUG_ON(driver->feature_table_size && !driver->feature_table); |
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driver->driver.bus = &virtio_bus; |
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return driver_register(&driver->driver); } EXPORT_SYMBOL_GPL(register_virtio_driver); void unregister_virtio_driver(struct virtio_driver *driver) { driver_unregister(&driver->driver); } EXPORT_SYMBOL_GPL(unregister_virtio_driver); int register_virtio_device(struct virtio_device *dev) { int err; dev->dev.bus = &virtio_bus; |
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/* Assign a unique device index and hence name. */ dev->index = dev_index++; |
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dev_set_name(&dev->dev, "virtio%u", dev->index); |
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/* 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); |
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/* Acknowledge that we've seen the device. */ add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE); |
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INIT_LIST_HEAD(&dev->vqs); |
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/* device_register() causes the bus infrastructure to look for a * matching driver. */ err = device_register(&dev->dev); if (err) add_status(dev, VIRTIO_CONFIG_S_FAILED); return err; } EXPORT_SYMBOL_GPL(register_virtio_device); void unregister_virtio_device(struct virtio_device *dev) { device_unregister(&dev->dev); } EXPORT_SYMBOL_GPL(unregister_virtio_device); |
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static int virtio_init(void) { if (bus_register(&virtio_bus) != 0) panic("virtio bus registration failed"); return 0; } |
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static void __exit virtio_exit(void) { bus_unregister(&virtio_bus); } |
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core_initcall(virtio_init); |
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module_exit(virtio_exit); MODULE_LICENSE("GPL"); |