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

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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: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2011-07-06 17:14:44 +02:00
parent 801019d59d
commit 17f5b569e0
1 changed files with 15 additions and 1 deletions
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16
drivers/iommu/amd_iommu.c
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@ -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 &&