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: Joerg Roedel <joerg.roedel@amd.com>
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 748eab0..a14f8dc 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -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 @@
{
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 @@
}
}
+ 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 &&