forked from luck/tmp_suning_uos_patched
b5a2c4f199
Up to now, the module.h header was as hard to keep out as sunlight. But we are cleaning that up. Fix the virtio users who simply expect module.h to be there in every C file. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
238 lines
6.5 KiB
C
238 lines
6.5 KiB
C
#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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#include <linux/module.h>
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/* Unique numbering for virtio devices. */
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static unsigned int dev_index;
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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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return sprintf(buf, "0x%04x\n", dev->id.device);
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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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return sprintf(buf, "0x%04x\n", dev->id.vendor);
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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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return sprintf(buf, "0x%08x\n", dev->config->get_status(dev));
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}
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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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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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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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__ATTR_RO(modalias),
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__ATTR_RO(features),
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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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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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}
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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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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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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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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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static int virtio_dev_probe(struct device *_d)
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{
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int err, i;
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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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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. */
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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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/* 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++)
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if (device_features & (1 << i))
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set_bit(i, dev->features);
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dev->config->finalize_features(dev);
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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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else
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add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK);
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return err;
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}
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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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/* 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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return 0;
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}
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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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int register_virtio_driver(struct virtio_driver *driver)
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{
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/* Catch this early. */
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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);
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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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/* Assign a unique device index and hence name. */
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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
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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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/* Acknowledge that we've seen the device. */
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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
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* matching driver. */
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err = device_register(&dev->dev);
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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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}
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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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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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core_initcall(virtio_init);
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module_exit(virtio_exit);
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MODULE_LICENSE("GPL");
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