iommu/amd: Introduce per PCI segment irq_lookup_table

This will replace global irq lookup table (irq_lookup_table).

Co-developed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Link: https://lore.kernel.org/r/20220706113825.25582-6-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/amd/amd_iommu_types.h b/drivers/iommu/amd/amd_iommu_types.h
index d0ee78c..cfb5f0e 100644 (file)
--- a/drivers/iommu/amd/amd_iommu_types.h
+++ b/drivers/iommu/amd/amd_iommu_types.h
@@ -565,6 +565,12 @@ struct amd_iommu_pci_seg {
         * device id.
         */
        struct 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;
 };
 
 /*

diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 35863ba..e05d792 100644 (file)
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -684,6 +684,26 @@ static inline void free_rlookup_table(struct amd_iommu_pci_seg *pci_seg)
        pci_seg->rlookup_table = NULL;
 }
 
+static inline int __init alloc_irq_lookup_table(struct amd_iommu_pci_seg *pci_seg)
+{
+       pci_seg->irq_lookup_table = (void *)__get_free_pages(
+                                            GFP_KERNEL | __GFP_ZERO,
+                                            get_order(rlookup_table_size));
+       kmemleak_alloc(pci_seg->irq_lookup_table,
+                      rlookup_table_size, 1, GFP_KERNEL);
+       if (pci_seg->irq_lookup_table == NULL)
+               return -ENOMEM;
+
+       return 0;
+}
+
+static inline void free_irq_lookup_table(struct amd_iommu_pci_seg *pci_seg)
+{
+       kmemleak_free(pci_seg->irq_lookup_table);
+       free_pages((unsigned long)pci_seg->irq_lookup_table,
+                  get_order(rlookup_table_size));
+       pci_seg->irq_lookup_table = NULL;
+}
 
 /*
  * Allocates the command buffer. This buffer is per AMD IOMMU. We can
@@ -1535,6 +1555,7 @@ static void __init free_pci_segments(void)
 
        for_each_pci_segment_safe(pci_seg, next) {
                list_del(&pci_seg->list);
+               free_irq_lookup_table(pci_seg);
                free_rlookup_table(pci_seg);
                free_dev_table(pci_seg);
                kfree(pci_seg);
@@ -2900,6 +2921,7 @@ static int __init early_amd_iommu_init(void)
                amd_iommu_irq_remap = check_ioapic_information();
 
        if (amd_iommu_irq_remap) {
+               struct amd_iommu_pci_seg *pci_seg;
                /*
                 * Interrupt remapping enabled, create kmem_cache for the
                 * remapping tables.
@@ -2916,6 +2938,11 @@ static int __init early_amd_iommu_init(void)
                if (!amd_iommu_irq_cache)
                        goto out;
 
+               for_each_pci_segment(pci_seg) {
+                       if (alloc_irq_lookup_table(pci_seg))
+                               goto out;
+               }
+
                irq_lookup_table = (void *)__get_free_pages(
                                GFP_KERNEL | __GFP_ZERO,
                                get_order(rlookup_table_size));