linux-4.4.1/iommu_group_get_for_dev() 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_get_for_dev() へ行く。
  • 1 (2017-11-29 (水) 14:21:37)

参照元†

説明†

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

• FIXME: これは何？
  • 説明

引数†

• struct device *dev
  • linux-4.4.1/device

返り値†

• struct iommu_group *
  • linux-4.4.1/iommu_group

参考†

実装†

/**
 * iommu_group_get_for_dev - Find or create the IOMMU group for a device
 * @dev: target device
 *
 * This function is intended to be called by IOMMU drivers and extended to
 * support common, bus-defined algorithms when determining or creating the
 * IOMMU group for a device.  On success, the caller will hold a reference
 * to the returned IOMMU group, which will already include the provided
 * device.  The reference should be released with iommu_group_put().
 */
struct iommu_group *iommu_group_get_for_dev(struct device *dev)
{
	const struct iommu_ops *ops = dev->bus->iommu_ops;
	struct iommu_group *group;
	int ret;

• • dev->bus は 型
  • [[linux-4.4.1/]]
  • linux-4.4.1/iommu_ops

	group = iommu_group_get(dev);
	if (group)
		return group;

• • linux-4.4.1/iommu_group_get()

	group = ERR_PTR(-EINVAL);

• • linux-4.4.1/ERR_PTR()

	if (ops && ops->device_group)
		group = ops->device_group(dev);

	if (IS_ERR(group))
		return group;

• • linux-4.4.1/IS_ERR()

	/*
	 * Try to allocate a default domain - needs support from the
	 * IOMMU driver.
	 */
	if (!group->default_domain) {
		group->default_domain = __iommu_domain_alloc(dev->bus,
							     IOMMU_DOMAIN_DMA);
		group->domain = group->default_domain;
	}

• • linux-4.4.1/__iommu_domain_alloc()

	ret = iommu_group_add_device(group, dev);
	if (ret) {
		iommu_group_put(group);
		return ERR_PTR(ret);
	}

• • linux-4.4.1/iommu_group_add_device()

	return group;
}

コメント†