Commit-ID: bb52777ec4d736c2d7c4f037b32d4eeeb172ed89
Gitweb: http://git.kernel.org/tip/bb52777ec4d736c2d7c4f037b32d4eeeb172ed89
Author: Joerg Roedel <joerg.roedel@xxxxxxx>
AuthorDate: Fri, 20 Nov 2009 14:31:51 +0100
Committer: Joerg Roedel <joerg.roedel@xxxxxxx>
CommitDate: Fri, 27 Nov 2009 11:45:49 +0100
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: Joerg Roedel <joerg.roedel@xxxxxxx>
---
arch/x86/include/asm/amd_iommu_types.h | 17 +++++++++++++++++
arch/x86/kernel/amd_iommu_init.c | 15 +++++++++++++++
2 files changed, 32 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/amd_iommu_types.h b/arch/x86/include/asm/amd_iommu_types.h
index df5e9c8..ab3e7bf 100644
--- a/arch/x86/include/asm/amd_iommu_types.h
+++ b/arch/x86/include/asm/amd_iommu_types.h
@@ -25,6 +25,11 @@
#include <linux/spinlock.h>
/*
+ * Maximum number of IOMMUs supported
+ */
+#define MAX_IOMMUS 32
+
+/*
* some size calculation constants
*/
#define DEV_TABLE_ENTRY_SIZE 32
@@ -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;
@@ -357,6 +365,15 @@ 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
*/
struct dev_table_entry {
diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index cee1142..8567d16 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -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)
{
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
--
To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
|