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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

drivers/iommu/amd_iommu.c

+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;