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Commit 81cd07b9 authored by Joerg Roedel's avatar Joerg Roedel
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iommu/amd: Create a list of reserved iova addresses



Put the MSI-range, the HT-range and the MMIO ranges of PCI
devices into that range, so that these addresses are not
allocated for DMA.

Copy this address list into every created dma_ops_domain.

Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 307d5851
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+69 −0
Original line number Diff line number Diff line
@@ -63,6 +63,12 @@
#define IOVA_PFN(addr)		((addr) >> PAGE_SHIFT)
#define DMA_32BIT_PFN		IOVA_PFN(DMA_BIT_MASK(32))

/* Reserved IOVA ranges */
#define MSI_RANGE_START		(0xfee00000)
#define MSI_RANGE_END		(0xfeefffff)
#define HT_RANGE_START		(0xfd00000000ULL)
#define HT_RANGE_END		(0xffffffffffULL)

/*
 * This bitmap is used to advertise the page sizes our hardware support
 * to the IOMMU core, which will then use this information to split
@@ -169,6 +175,9 @@ struct dma_ops_domain {
	struct iova_domain iovad;
};

static struct iova_domain reserved_iova_ranges;
static struct lock_class_key reserved_rbtree_key;

/****************************************************************************
 *
 * Helper functions
@@ -2058,6 +2067,9 @@ static struct dma_ops_domain *dma_ops_domain_alloc(void)
	init_iova_domain(&dma_dom->iovad, PAGE_SIZE,
			 IOVA_START_PFN, DMA_32BIT_PFN);

	/* Initialize reserved ranges */
	copy_reserved_iova(&reserved_iova_ranges, &dma_dom->iovad);

	return dma_dom;

free_dma_dom:
@@ -2963,6 +2975,59 @@ static struct dma_map_ops amd_iommu_dma_ops = {
	.set_dma_mask	= set_dma_mask,
};

static int init_reserved_iova_ranges(void)
{
	struct pci_dev *pdev = NULL;
	struct iova *val;

	init_iova_domain(&reserved_iova_ranges, PAGE_SIZE,
			 IOVA_START_PFN, DMA_32BIT_PFN);

	lockdep_set_class(&reserved_iova_ranges.iova_rbtree_lock,
			  &reserved_rbtree_key);

	/* MSI memory range */
	val = reserve_iova(&reserved_iova_ranges,
			   IOVA_PFN(MSI_RANGE_START), IOVA_PFN(MSI_RANGE_END));
	if (!val) {
		pr_err("Reserving MSI range failed\n");
		return -ENOMEM;
	}

	/* HT memory range */
	val = reserve_iova(&reserved_iova_ranges,
			   IOVA_PFN(HT_RANGE_START), IOVA_PFN(HT_RANGE_END));
	if (!val) {
		pr_err("Reserving HT range failed\n");
		return -ENOMEM;
	}

	/*
	 * Memory used for PCI resources
	 * FIXME: Check whether we can reserve the PCI-hole completly
	 */
	for_each_pci_dev(pdev) {
		int i;

		for (i = 0; i < PCI_NUM_RESOURCES; ++i) {
			struct resource *r = &pdev->resource[i];

			if (!(r->flags & IORESOURCE_MEM))
				continue;

			val = reserve_iova(&reserved_iova_ranges,
					   IOVA_PFN(r->start),
					   IOVA_PFN(r->end));
			if (!val) {
				pr_err("Reserve pci-resource range failed\n");
				return -ENOMEM;
			}
		}
	}

	return 0;
}

int __init amd_iommu_init_api(void)
{
	int ret, err = 0;
@@ -2971,6 +3036,10 @@ int __init amd_iommu_init_api(void)
	if (ret)
		return ret;

	ret = init_reserved_iova_ranges();
	if (ret)
		return ret;

	err = bus_set_iommu(&pci_bus_type, &amd_iommu_ops);
	if (err)
		return err;