linux-4.4.1/iommu_group_add_device() の履歴(No.1)

• 履歴一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• linux-4.4.1/iommu_group_add_device() へ行く。
  • 1 (2017-11-29 (水) 11:53:27)

---

参照元†

• linux-4.4.1/iommu_group_get()
• linux-4.4.1/iommu_group_get_for_dev()

説明†

• パス: linux-4.4.1/drivers/iommu/iommu.c

• FIXME: これは何？
  • 説明

引数†

• struct iommu_group *group
  • linux-4.4.1/iommu_group
• struct device *dev
  • linux-4.4.1/device

返り値†

• int

参考†

実装†

/**
 * iommu_group_add_device - add a device to an iommu group
 * @group: the group into which to add the device (reference should be held)
 * @dev: the device
 *
 * This function is called by an iommu driver to add a device into a
 * group.  Adding a device increments the group reference count.
 */
int iommu_group_add_device(struct iommu_group *group, struct device *dev)
{
	int ret, i = 0;
	struct iommu_device *device;

• • linux-4.4.1/iommu_device

	device = kzalloc(sizeof(*device), GFP_KERNEL);
	if (!device)
		return -ENOMEM;

• • linux-4.4.1/kzalloc()

	device->dev = dev;

	ret = sysfs_create_link(&dev->kobj, &group->kobj, "iommu_group");
	if (ret) {
		kfree(device);
		return ret;
	}

• • linux-4.4.1/sysfs_create_link()
  • linux-4.4.1/kfree()

	device->name = kasprintf(GFP_KERNEL, "%s", kobject_name(&dev->kobj));

• • linux-4.4.1/kasprintf()
  • linux-4.4.1/kobject_name()

rename:
	if (!device->name) {
		sysfs_remove_link(&dev->kobj, "iommu_group");
		kfree(device);
		return -ENOMEM;
	}

• • linux-4.4.1/sysfs_remove_link()
  • linux-4.4.1/kfree()

	ret = sysfs_create_link_nowarn(group->devices_kobj,
				       &dev->kobj, device->name);
	if (ret) {
		kfree(device->name);
		if (ret == -EEXIST && i >= 0) {
			/*
			 * Account for the slim chance of collision
			 * and append an instance to the name.
			 */
			device->name = kasprintf(GFP_KERNEL, "%s.%d",
						 kobject_name(&dev->kobj), i++);
			goto rename;
		}

		sysfs_remove_link(&dev->kobj, "iommu_group");
		kfree(device);
		return ret;
	}

• • linux-4.4.1/kasprintf()
  • linux-4.4.1/sysfs_remove_link()

	kobject_get(group->devices_kobj);

• • linux-4.4.1/kobject_get()

	dev->iommu_group = group;

	iommu_group_create_direct_mappings(group, dev);

• • linux-4.4.1/iommu_group_create_direct_mappings()

	mutex_lock(&group->mutex);
	list_add_tail(&device->list, &group->devices);
	if (group->domain)
		__iommu_attach_device(group->domain, dev);
	mutex_unlock(&group->mutex);

• • linux-4.4.1/mutex_lock()
  • linux-4.4.1/list_add_tail()
  • linux-4.4.1/__iommu_attach_device()
  • linux-4.4.1/mutex_unlock()

	/* Notify any listeners about change to group. */
	blocking_notifier_call_chain(&group->notifier,
				     IOMMU_GROUP_NOTIFY_ADD_DEVICE, dev);

• • linux-4.4.1/blocking_notifier_call_chain()

	trace_add_device_to_group(group->id, dev);

• • linux-4.4.1/trace_add_device_to_group()

	pr_info("Adding device %s to group %d\n", dev_name(dev), group->id);

• • linux-4.4.1/pr_info()
  • linux-4.4.1/dev_name()

	return 0;
}
EXPORT_SYMBOL_GPL(iommu_group_add_device);

• • linux-4.4.1/EXPORT_SYMBOL_GPL()

コメント†