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x86/amd-iommu: Add an index field to struct amd_iommu
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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: Joerg Roedel <joerg.roedel@amd.com>
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Joerg Roedel committed Nov 27, 2009
1 parent bf3118c commit bb52777
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Showing 2 changed files with 32 additions and 0 deletions.
17 changes: 17 additions & 0 deletions arch/x86/include/asm/amd_iommu_types.h
Original file line number Diff line number Diff line change
Expand Up @@ -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
*/
Expand Down Expand Up @@ -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;

Expand Down Expand Up @@ -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
*/
Expand Down
15 changes: 15 additions & 0 deletions arch/x86/kernel/amd_iommu_init.c
Original file line number Diff line number Diff line change
Expand Up @@ -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
Expand Down Expand Up @@ -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)
{
spin_lock_init(&iommu->lock);

/* 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
Expand Down

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