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Subject[PATCH 14/27] iommu/amd: Allocate data structures to keep track of irq remapping tables
Date
To easily map device ids to interrupt remapping table
entries a new lookup table is necessary.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
drivers/iommu/amd_iommu_init.c | 16 ++++++++++++++++
drivers/iommu/amd_iommu_types.h | 9 +++++++++
2 files changed, 25 insertions(+)
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 49e72b9..473a51d 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -181,6 +181,12 @@ u16 *amd_iommu_alias_table;
struct amd_iommu **amd_iommu_rlookup_table;

/*
+ * This table is used to find the irq remapping table for a given device id
+ * quickly.
+ */
+struct irq_remap_table **irq_lookup_table;
+
+/*
* AMD IOMMU allows up to 2^16 differend protection domains. This is a bitmap
* to know which ones are already in use.
*/
@@ -1532,9 +1538,13 @@ static struct syscore_ops amd_iommu_syscore_ops = {

static void __init free_on_init_error(void)
{
+ free_pages((unsigned long)irq_lookup_table,
+ get_order(rlookup_table_size));
+
if (amd_iommu_irq_cache) {
kmem_cache_destroy(amd_iommu_irq_cache);
amd_iommu_irq_cache = NULL;
+
}

amd_iommu_uninit_devices();
@@ -1687,6 +1697,12 @@ static int __init early_amd_iommu_init(void)
0, NULL);
if (!amd_iommu_irq_cache)
goto out;
+
+ irq_lookup_table = (void *)__get_free_pages(
+ GFP_KERNEL | __GFP_ZERO,
+ get_order(rlookup_table_size));
+ if (!irq_lookup_table)
+ goto out;
}

ret = init_memory_definitions(ivrs_base);
diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index 0e15e78..ceaa499 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -175,6 +175,7 @@
#define DEV_ENTRY_EX 0x67
#define DEV_ENTRY_SYSMGT1 0x68
#define DEV_ENTRY_SYSMGT2 0x69
+#define DEV_ENTRY_IRQ_TBL_EN 0x80
#define DEV_ENTRY_INIT_PASS 0xb8
#define DEV_ENTRY_EINT_PASS 0xb9
#define DEV_ENTRY_NMI_PASS 0xba
@@ -337,6 +338,14 @@ extern bool amd_iommu_iotlb_sup;
#define MAX_IRQS_PER_TABLE 256
#define IRQ_TABLE_ALIGNMENT 128

+struct irq_remap_table {
+ spinlock_t lock;
+ unsigned min_index;
+ u32 *table;
+};
+
+extern struct irq_remap_table **irq_lookup_table;
+
/* Interrupt remapping feature used? */
extern bool amd_iommu_irq_remap;

--
1.7.9.5



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