linux-4.4.1/do_iommu_attach() 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/do_iommu_attach() へ行く。
  • 1 (2017-11-28 (火) 17:21:12)

参照元†

• linux-4.4.1/__iommu_attach_notifier()
• linux-4.4.1/__iommu_setup_dma_ops()

説明†

• パス: linux-4.4.1/arch/arm64/mm/dma-mapping.c

• FIXME: これは何？
  • 説明

引数†

• struct device *dev
  • linux-4.4.1/device
• const struct iommu_ops *ops
  • linux-4.4.1/iommu_ops
• u64 dma_base
• u64 size

返り値†

• bool

参考†

実装†

static bool do_iommu_attach(struct device *dev, const struct iommu_ops *ops,
			   u64 dma_base, u64 size)
{
	struct iommu_domain *domain = iommu_get_domain_for_dev(dev);

• • linux-4.4.1/iommu_domain
  • linux-4.4.1/iommu_get_domain_for_dev()

	/*
	 * Best case: The device is either part of a group which was
	 * already attached to a domain in a previous call, or it's
	 * been put in a default DMA domain by the IOMMU core.
	 */
	if (!domain) {
		/*
		 * Urgh. The IOMMU core isn't going to do default domains
		 * for non-PCI devices anyway, until it has some means of
		 * abstracting the entirely implementation-specific
		 * sideband data/SoC topology/unicorn dust that may or
		 * may not differentiate upstream masters.
		 * So until then, HORRIBLE HACKS!
		 */
		domain = ops->domain_alloc(IOMMU_DOMAIN_DMA);
		if (!domain)
			goto out_no_domain;

		domain->ops = ops;
		domain->type = IOMMU_DOMAIN_DMA | __IOMMU_DOMAIN_FAKE_DEFAULT;

		if (iommu_attach_device(domain, dev))
			goto out_put_domain;

• • linux-4.4.1/iommu_attach_device()

	}

	if (iommu_dma_init_domain(domain, dma_base, size))
		goto out_detach;

• • linux-4.4.1/iommu_dma_init_domain()

	dev->archdata.dma_ops = &iommu_dma_ops;
	return true;

• • [[linux-4.4.1/]]
  • linux-4.4.1/iommu_dma_ops(global)

out_detach:
	iommu_detach_device(domain, dev);

• • linux-4.4.1/iommu_detach_device()

out_put_domain:
	if (domain->type & __IOMMU_DOMAIN_FAKE_DEFAULT)
		iommu_domain_free(domain);

• • linux-4.4.1/iommu_domain_free()

out_no_domain:
	pr_warn("Failed to set up IOMMU for device %s; retaining platform DMA ops\n",
		dev_name(dev));
	return false;

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

}

コメント†