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Commit 17f5b569 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

iommu/amd: Don't use MSI address range for DMA addresses 



Reserve the MSI address range in the address allocator so
that MSI addresses are not handed out as dma handles.

Cc: stable@kernel.org
Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent 801019d5

drivers/iommu/amd_iommu.c

+15 −1
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ 
#include <linux/iommu.h>

#include <linux/delay.h>

#include <linux/amd-iommu.h>

#include <asm/msidef.h>

#include <asm/proto.h>

#include <asm/iommu.h>

#include <asm/gart.h>
@@ -1202,7 +1203,7 @@ static int alloc_new_range(struct dma_ops_domain *dma_dom, 
{

	int index = dma_dom->aperture_size >> APERTURE_RANGE_SHIFT;

	struct amd_iommu *iommu;

	unsigned long i;

	unsigned long i, old_size;



#ifdef CONFIG_IOMMU_STRESS

	populate = false;
@@ -1238,8 +1239,21 @@ static int alloc_new_range(struct dma_ops_domain *dma_dom, 
		}

	}



	old_size                = dma_dom->aperture_size;

	dma_dom->aperture_size += APERTURE_RANGE_SIZE;



	/* Reserve address range used for MSI messages */

	if (old_size < MSI_ADDR_BASE_LO &&

	    dma_dom->aperture_size > MSI_ADDR_BASE_LO) {

		unsigned long spage;

		int pages;



		pages = iommu_num_pages(MSI_ADDR_BASE_LO, 0x10000, PAGE_SIZE);

		spage = MSI_ADDR_BASE_LO >> PAGE_SHIFT;



		dma_ops_reserve_addresses(dma_dom, spage, pages);

	}



	/* Initialize the exclusion range if necessary */

	for_each_iommu(iommu) {

		if (iommu->exclusion_start &&