1 files changed, 184 insertions, 0 deletions

diff --git a/arch/x86/mm/srat.c b/arch/x86/mm/srat.c
new file mode 100644
index 000000000000..81dbfdeb080d
--- /dev/null
+++ b/arch/x86/mm/srat.c
@@ -0,0 +1,184 @@
+/*
+ * ACPI 3.0 based NUMA setup
+ * Copyright 2004 Andi Kleen, SuSE Labs.
+ *
+ * Reads the ACPI SRAT table to figure out what memory belongs to which CPUs.
+ *
+ * Called from acpi_numa_init while reading the SRAT and SLIT tables.
+ * Assumes all memory regions belonging to a single proximity domain
+ * are in one chunk. Holes between them will be included in the node.
+ */
+
+#include <linux/kernel.h>
+#include <linux/acpi.h>
+#include <linux/mmzone.h>
+#include <linux/bitmap.h>
+#include <linux/module.h>
+#include <linux/topology.h>
+#include <linux/bootmem.h>
+#include <linux/memblock.h>
+#include <linux/mm.h>
+#include <asm/proto.h>
+#include <asm/numa.h>
+#include <asm/e820.h>
+#include <asm/apic.h>
+#include <asm/uv/uv.h>
+
+int acpi_numa __initdata;
+
+static __init int setup_node(int pxm)
+{
+        return acpi_map_pxm_to_node(pxm);
+}
+
+static __init void bad_srat(void)
+{
+        printk(KERN_ERR "SRAT: SRAT not used.\n");
+        acpi_numa = -1;
+}
+
+static __init inline int srat_disabled(void)
+{
+        return acpi_numa < 0;
+}
+
+/* Callback for SLIT parsing */
+void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
+{
+        int i, j;
+
+        for (i = 0; i < slit->locality_count; i++)
+                for (j = 0; j < slit->locality_count; j++)
+                        numa_set_distance(pxm_to_node(i), pxm_to_node(j),
+                                slit->entry[slit->locality_count * i + j]);
+}
+
+/* Callback for Proximity Domain -> x2APIC mapping */
+void __init
+acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
+{
+        int pxm, node;
+        int apic_id;
+
+        if (srat_disabled())
+                return;
+        if (pa->header.length < sizeof(struct acpi_srat_x2apic_cpu_affinity)) {
+                bad_srat();
+                return;
+        }
+        if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
+                return;
+        pxm = pa->proximity_domain;
+        node = setup_node(pxm);
+        if (node < 0) {
+                printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
+                bad_srat();
+                return;
+        }
+
+        apic_id = pa->apic_id;
+        if (apic_id >= MAX_LOCAL_APIC) {
+                printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
+                return;
+        }
+        set_apicid_to_node(apic_id, node);
+        node_set(node, numa_nodes_parsed);
+        acpi_numa = 1;
+        printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u\n",
+               pxm, apic_id, node);
+}
+
+/* Callback for Proximity Domain -> LAPIC mapping */
+void __init
+acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
+{
+        int pxm, node;
+        int apic_id;
+
+        if (srat_disabled())
+                return;
+        if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
+                bad_srat();
+                return;
+        }
+        if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
+                return;
+        pxm = pa->proximity_domain_lo;
+        node = setup_node(pxm);
+        if (node < 0) {
+                printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
+                bad_srat();
+                return;
+        }
+
+        if (get_uv_system_type() >= UV_X2APIC)
+                apic_id = (pa->apic_id << 8) | pa->local_sapic_eid;
+        else
+                apic_id = pa->apic_id;
+
+        if (apic_id >= MAX_LOCAL_APIC) {
+                printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
+                return;
+        }
+
+        set_apicid_to_node(apic_id, node);
+        node_set(node, numa_nodes_parsed);
+        acpi_numa = 1;
+        printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u\n",
+               pxm, apic_id, node);
+}
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+static inline int save_add_info(void) {return 1;}
+#else
+static inline int save_add_info(void) {return 0;}
+#endif
+
+/* Callback for parsing of the Proximity Domain <-> Memory Area mappings */
+void __init
+acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
+{
+        u64 start, end;
+        int node, pxm;
+
+        if (srat_disabled())
+                return;
+        if (ma->header.length != sizeof(struct acpi_srat_mem_affinity)) {
+                bad_srat();
+                return;
+        }
+        if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)
+                return;
+
+        if ((ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) && !save_add_info())
+                return;
+        start = ma->base_address;
+        end = start + ma->length;
+        pxm = ma->proximity_domain;
+        node = setup_node(pxm);
+        if (node < 0) {
+                printk(KERN_ERR "SRAT: Too many proximity domains.\n");
+                bad_srat();
+                return;
+        }
+
+        if (numa_add_memblk(node, start, end) < 0) {
+                bad_srat();
+                return;
+        }
+
+        printk(KERN_INFO "SRAT: Node %u PXM %u %Lx-%Lx\n", node, pxm,
+               start, end);
+}
+
+void __init acpi_numa_arch_fixup(void) {}
+
+int __init x86_acpi_numa_init(void)
+{
+        int ret;
+
+        ret = acpi_numa_init();
+        if (ret < 0)
+                return ret;
+        return srat_disabled() ? -EINVAL : 0;
+}