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authorJoerg Roedel <joerg.roedel@amd.com>2012-06-15 18:53:51 +0400
committerJoerg Roedel <joerg.roedel@amd.com>2012-09-28 19:30:03 +0400
commit05152a0494449f60031da683e6d4cd60d0882214 (patch)
tree610e4df7df61da02c2cc3ccc24aeb38896f7509e /drivers/iommu/amd_iommu_init.c
parent6efed63bec36e260204a50cfe6878cd36b710ade (diff)
downloadlinux-05152a0494449f60031da683e6d4cd60d0882214.tar.xz
iommu/amd: Add slab-cache for irq remapping tables
The irq remapping tables for the AMD IOMMU need to be aligned on a 128 byte boundary. Create a seperate slab-cache to guarantee this alignment. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'drivers/iommu/amd_iommu_init.c')
-rw-r--r--drivers/iommu/amd_iommu_init.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 617985961195..073ed5d1e053 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -36,6 +36,7 @@
#include "amd_iommu_proto.h"
#include "amd_iommu_types.h"
+#include "irq_remapping.h"
/*
* definitions for the ACPI scanning code
@@ -127,6 +128,7 @@ struct ivmd_header {
} __attribute__((packed));
bool amd_iommu_dump;
+bool amd_iommu_irq_remap __read_mostly;
static bool amd_iommu_detected;
static bool __initdata amd_iommu_disabled;
@@ -1530,6 +1532,11 @@ static struct syscore_ops amd_iommu_syscore_ops = {
static void __init free_on_init_error(void)
{
+ if (amd_iommu_irq_cache) {
+ kmem_cache_destroy(amd_iommu_irq_cache);
+ amd_iommu_irq_cache = NULL;
+ }
+
amd_iommu_uninit_devices();
free_pages((unsigned long)amd_iommu_pd_alloc_bitmap,
@@ -1669,6 +1676,19 @@ static int __init early_amd_iommu_init(void)
if (ret)
goto out;
+ if (amd_iommu_irq_remap) {
+ /*
+ * Interrupt remapping enabled, create kmem_cache for the
+ * remapping tables.
+ */
+ amd_iommu_irq_cache = kmem_cache_create("irq_remap_cache",
+ MAX_IRQS_PER_TABLE * sizeof(u32),
+ IRQ_TABLE_ALIGNMENT,
+ 0, NULL);
+ if (!amd_iommu_irq_cache)
+ goto out;
+ }
+
ret = init_memory_definitions(ivrs_base);
if (ret)
goto out;
@@ -1716,6 +1736,9 @@ static bool detect_ivrs(void)
/* Make sure ACS will be enabled during PCI probe */
pci_request_acs();
+ if (!disable_irq_remap)
+ amd_iommu_irq_remap = true;
+
return true;
}