Commit bb52777e authored by Joerg Roedel's avatar Joerg Roedel
Browse files

x86/amd-iommu: Add an index field to struct amd_iommu

This patch adds an index field to struct amd_iommu which can
be used to lookup it up in an array. This index will be used
in struct protection_domain to keep track which protection
domain has devices behind which IOMMU.
Signed-off-by: default avatarJoerg Roedel <>
parent bf3118c1
......@@ -24,6 +24,11 @@
#include <linux/list.h>
#include <linux/spinlock.h>
* Maximum number of IOMMUs supported
#define MAX_IOMMUS 32
* some size calculation constants
......@@ -291,6 +296,9 @@ struct dma_ops_domain {
struct amd_iommu {
struct list_head list;
/* Index within the IOMMU array */
int index;
/* locks the accesses to the hardware */
spinlock_t lock;
......@@ -356,6 +364,15 @@ struct amd_iommu {
extern struct list_head amd_iommu_list;
* Array with pointers to each IOMMU struct
* The indices are referenced in the protection domains
extern struct amd_iommu *amd_iommus[MAX_IOMMUS];
/* Number of IOMMUs present in the system */
extern int amd_iommus_present;
* Structure defining one entry in the device table
......@@ -137,6 +137,10 @@ bool amd_iommu_unmap_flush; /* if true, flush on every unmap */
LIST_HEAD(amd_iommu_list); /* list of all AMD IOMMUs in the
system */
/* Array to assign indices to IOMMUs*/
struct amd_iommu *amd_iommus[MAX_IOMMUS];
int amd_iommus_present;
* Pointer to the device table which is shared by all AMD IOMMUs
* it is indexed by the PCI device id or the HT unit id and contains
......@@ -840,7 +844,18 @@ static void __init free_iommu_all(void)
static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h)
/* Add IOMMU to internal data structures */
list_add_tail(&iommu->list, &amd_iommu_list);
iommu->index = amd_iommus_present++;
if (unlikely(iommu->index >= MAX_IOMMUS)) {
WARN(1, "AMD-Vi: System has more IOMMUs than supported by this driver\n");
return -ENOSYS;
/* Index is fine - add IOMMU to the array */
amd_iommus[iommu->index] = iommu;
* Copy data from ACPI table entry to the iommu struct
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