To easily map device ids to interrupt remapping table
entries a new lookup table is necessary.
Signed-off-by: Joerg Roedel <joerg.roe...@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 a046a0e..db100c5 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.
*/
@@ -1529,9 +1535,13 @@ 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();
@@ -1684,6 +1694,12 @@ 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 953cea8..1a7d480 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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