linux-4.4.1/iommu_unmap() 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_unmap() へ行く。
  • 1 (2017-11-30 (木) 14:22:13)

参照元†

• linux-4.4.1/__iommu_dma_unmap()
• linux-4.4.1/iommu_dma_ops(global)
• linux-4.4.1/iommu_map()

説明†

• パス: 複数あり
  • CONFIG_IOMMU_API 有効: linux-4.4.1/drivers/iommu/iommu.c
  • CONFIG_IOMMU_API 無効: linux-4.4.1/include/linux/iommu.h

• FIXME: これは何？
  • 説明

引数†

• struct iommu_domain *domain
  • linux-4.4.1/iommu_domain
• unsigned long iova
• size_t size

返り値†

• size_t

参考†

実装†

CONFIG_IOMMU_API 有効: linux-4.4.1/drivers/iommu/iommu.c†

size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size)
{
	size_t unmapped_page, unmapped = 0;
	unsigned int min_pagesz;
	unsigned long orig_iova = iova;

	if (unlikely(domain->ops->unmap == NULL ||
		     domain->ops->pgsize_bitmap == 0UL))
		return -ENODEV;

	if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING)))
		return -EINVAL;

• • domain->ops は const struct iommu_ops * 型
  • linux-4.4.1/iommu_ops
  • linux-4.4.1/unlikely()

	/* find out the minimum page size supported */
	min_pagesz = 1 << __ffs(domain->ops->pgsize_bitmap);

• • linux-4.4.1/__ffs()

	/*
	 * The virtual address, as well as the size of the mapping, must be
	 * aligned (at least) to the size of the smallest page supported
	 * by the hardware
	 */
	if (!IS_ALIGNED(iova | size, min_pagesz)) {
		pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n",
		       iova, size, min_pagesz);
		return -EINVAL;
	}

	pr_debug("unmap this: iova 0x%lx size 0x%zx\n", iova, size);

• • linux-4.4.1/IS_ALIGNED()
  • linux-4.4.1/pr_err()
  • linux-4.4.1/pr_debug()

	/*
	 * Keep iterating until we either unmap 'size' bytes (or more)
	 * or we hit an area that isn't mapped.
	 */
	while (unmapped < size) {
		size_t pgsize = iommu_pgsize(domain, iova, size - unmapped);

		unmapped_page = domain->ops->unmap(domain, iova, pgsize);
		if (!unmapped_page)
			break;

• • domain->ops は const struct iommu_ops * 型
  • linux-4.4.1/iommu_ops
  • linux-4.4.1/iommu_pgsize()

		pr_debug("unmapped: iova 0x%lx size 0x%zx\n",
			 iova, unmapped_page);

		iova += unmapped_page;
		unmapped += unmapped_page;
	}

	trace_unmap(orig_iova, size, unmapped);
	return unmapped;

• • linux-4.4.1/trace_unmap()

}
EXPORT_SYMBOL_GPL(iommu_unmap);

• • linux-4.4.1/EXPORT_SYMBOL_GPL()

CONFIG_IOMMU_API 無効: linux-4.4.1/include/linux/iommu.h†

static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
			      int gfp_order)
{
	return -ENODEV;
}

コメント†