dmar: support for parsing Remapping Hardware Static Affinity structure

Add support for parsing Remapping Hardware Static Affinity (RHSA) structure.
This enables identifying the association between remapping hardware units and
the corresponding proximity domain. This enables to allocate transalation
structures closer to the remapping hardware unit.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index 22b02c6..5779565 100644 (file)
--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -348,6 +348,26 @@ found:
 }
 #endif
 
+static int __init
+dmar_parse_one_rhsa(struct acpi_dmar_header *header)
+{
+       struct acpi_dmar_rhsa *rhsa;
+       struct dmar_drhd_unit *drhd;
+
+       rhsa = (struct acpi_dmar_rhsa *)header;
+       for_each_drhd_unit(drhd)
+               if (drhd->reg_base_addr == rhsa->base_address) {
+                       int node = acpi_map_pxm_to_node(rhsa->proximity_domain);
+
+                       if (!node_online(node))
+                               node = -1;
+                       drhd->iommu->node = node;
+               return 0;
+       }
+
+       return -ENODEV;
+}
+
 static void __init
 dmar_table_print_dmar_entry(struct acpi_dmar_header *header)
 {
@@ -467,7 +487,7 @@ parse_dmar_table(void)
 #endif
                        break;
                case ACPI_DMAR_HARDWARE_AFFINITY:
-                       /* We don't do anything with RHSA (yet?) */
+                       ret = dmar_parse_one_rhsa(entry_header);
                        break;
                default:
                        printk(KERN_WARNING PREFIX
@@ -677,6 +697,8 @@ int alloc_iommu(struct dmar_drhd_unit *drhd)
        iommu->agaw = agaw;
        iommu->msagaw = msagaw;
 
+       iommu->node = -1;
+
        /* the registers might be more than one page */
        map_size = max_t(int, ecap_max_iotlb_offset(iommu->ecap),
                cap_max_fault_reg_offset(iommu->cap));

diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index 4f0a72a..9310c69 100644 (file)
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -332,6 +332,7 @@ struct intel_iommu {
 #ifdef CONFIG_INTR_REMAP
        struct ir_table *ir_table;      /* Interrupt remapping info */
 #endif
+       int             node;
 };
 
 static inline void __iommu_flush_cache(