iommu/amd: Allocate data structures to keep track of irq remapping tables

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>

2 files changed, 25 insertions, 0 deletions

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 073ed5d1e05..2d923fe7c2a 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -184,6 +184,12 @@ 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 953cea80daa..1a7d48078d3 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;