--- /dev/null
+/*
+ * acpi_numa.c - ACPI NUMA support
+ *
+ * Copyright (C) 2002 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/acpi.h>
+#include <linux/numa.h>
+
+#define PREFIX "ACPI: "
+
+#define ACPI_NUMA 0x80000000
+#define _COMPONENT ACPI_NUMA
+ACPI_MODULE_NAME("numa");
+
+static nodemask_t nodes_found_map = NODE_MASK_NONE;
+
+/* maps to convert between proximity domain and logical node ID */
+static int pxm_to_node_map[MAX_PXM_DOMAINS]
+ = { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE };
+static int node_to_pxm_map[MAX_NUMNODES]
+ = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
+
+unsigned char acpi_srat_revision __initdata;
+
+int pxm_to_node(int pxm)
+{
+ if (pxm < 0)
+ return NUMA_NO_NODE;
+ return pxm_to_node_map[pxm];
+}
+
+int node_to_pxm(int node)
+{
+ if (node < 0)
+ return PXM_INVAL;
+ return node_to_pxm_map[node];
+}
+
+static void __acpi_map_pxm_to_node(int pxm, int node)
+{
+ if (pxm_to_node_map[pxm] == NUMA_NO_NODE || node < pxm_to_node_map[pxm])
+ pxm_to_node_map[pxm] = node;
+ if (node_to_pxm_map[node] == PXM_INVAL || pxm < node_to_pxm_map[node])
+ node_to_pxm_map[node] = pxm;
+}
+
+int acpi_map_pxm_to_node(int pxm)
+{
+ int node = pxm_to_node_map[pxm];
+
+ if (node == NUMA_NO_NODE) {
+ if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
+ return NUMA_NO_NODE;
+ node = first_unset_node(nodes_found_map);
+ __acpi_map_pxm_to_node(pxm, node);
+ node_set(node, nodes_found_map);
+ }
+
+ return node;
+}
+
+static void __init
+acpi_table_print_srat_entry(struct acpi_subtable_header *header)
+{
+
+ ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
+
+ if (!header)
+ return;
+
+ switch (header->type) {
+
+ case ACPI_SRAT_TYPE_CPU_AFFINITY:
+#ifdef ACPI_DEBUG_OUTPUT
+ {
+ struct acpi_srat_cpu_affinity *p =
+ (struct acpi_srat_cpu_affinity *)header;
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
+ p->apic_id, p->local_sapic_eid,
+ p->proximity_domain_lo,
+ (p->flags & ACPI_SRAT_CPU_ENABLED)?
+ "enabled" : "disabled"));
+ }
+#endif /* ACPI_DEBUG_OUTPUT */
+ break;
+
+ case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
+#ifdef ACPI_DEBUG_OUTPUT
+ {
+ struct acpi_srat_mem_affinity *p =
+ (struct acpi_srat_mem_affinity *)header;
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "SRAT Memory (0x%lx length 0x%lx) in proximity domain %d %s%s%s\n",
+ (unsigned long)p->base_address,
+ (unsigned long)p->length,
+ p->proximity_domain,
+ (p->flags & ACPI_SRAT_MEM_ENABLED)?
+ "enabled" : "disabled",
+ (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
+ " hot-pluggable" : "",
+ (p->flags & ACPI_SRAT_MEM_NON_VOLATILE)?
+ " non-volatile" : ""));
+ }
+#endif /* ACPI_DEBUG_OUTPUT */
+ break;
+
+ case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
+#ifdef ACPI_DEBUG_OUTPUT
+ {
+ struct acpi_srat_x2apic_cpu_affinity *p =
+ (struct acpi_srat_x2apic_cpu_affinity *)header;
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "SRAT Processor (x2apicid[0x%08x]) in"
+ " proximity domain %d %s\n",
+ p->apic_id,
+ p->proximity_domain,
+ (p->flags & ACPI_SRAT_CPU_ENABLED) ?
+ "enabled" : "disabled"));
+ }
+#endif /* ACPI_DEBUG_OUTPUT */
+ break;
+ default:
+ printk(KERN_WARNING PREFIX
+ "Found unsupported SRAT entry (type = 0x%x)\n",
+ header->type);
+ break;
+ }
+}
+
+/*
+ * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
+ * up the NUMA heuristics which wants the local node to have a smaller
+ * distance than the others.
+ * Do some quick checks here and only use the SLIT if it passes.
+ */
+static int __init slit_valid(struct acpi_table_slit *slit)
+{
+ int i, j;
+ int d = slit->locality_count;
+ for (i = 0; i < d; i++) {
+ for (j = 0; j < d; j++) {
+ u8 val = slit->entry[d*i + j];
+ if (i == j) {
+ if (val != LOCAL_DISTANCE)
+ return 0;
+ } else if (val <= LOCAL_DISTANCE)
+ return 0;
+ }
+ }
+ return 1;
+}
+
+static int __init acpi_parse_slit(struct acpi_table_header *table)
+{
+ struct acpi_table_slit *slit = (struct acpi_table_slit *)table;
+
+ if (!slit_valid(slit)) {
+ printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n");
+ return -EINVAL;
+ }
+ acpi_numa_slit_init(slit);
+
+ return 0;
+}
+
+void __init __weak
+acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
+{
+ printk(KERN_WARNING PREFIX
+ "Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
+ return;
+}
+
+
+static int __init
+acpi_parse_x2apic_affinity(struct acpi_subtable_header *header,
+ const unsigned long end)
+{
+ struct acpi_srat_x2apic_cpu_affinity *processor_affinity;
+
+ processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
+ if (!processor_affinity)
+ return -EINVAL;
+
+ acpi_table_print_srat_entry(header);
+
+ /* let architecture-dependent part to do it */
+ acpi_numa_x2apic_affinity_init(processor_affinity);
+
+ return 0;
+}
+
+static int __init
+acpi_parse_processor_affinity(struct acpi_subtable_header *header,
+ const unsigned long end)
+{
+ struct acpi_srat_cpu_affinity *processor_affinity;
+
+ processor_affinity = (struct acpi_srat_cpu_affinity *)header;
+ if (!processor_affinity)
+ return -EINVAL;
+
+ acpi_table_print_srat_entry(header);
+
+ /* let architecture-dependent part to do it */
+ acpi_numa_processor_affinity_init(processor_affinity);
+
+ return 0;
+}
+
+static int __initdata parsed_numa_memblks;
+
+static int __init
+acpi_parse_memory_affinity(struct acpi_subtable_header * header,
+ const unsigned long end)
+{
+ struct acpi_srat_mem_affinity *memory_affinity;
+
+ memory_affinity = (struct acpi_srat_mem_affinity *)header;
+ if (!memory_affinity)
+ return -EINVAL;
+
+ acpi_table_print_srat_entry(header);
+
+ /* let architecture-dependent part to do it */
+ if (!acpi_numa_memory_affinity_init(memory_affinity))
+ parsed_numa_memblks++;
+ return 0;
+}
+
+static int __init acpi_parse_srat(struct acpi_table_header *table)
+{
+ struct acpi_table_srat *srat = (struct acpi_table_srat *)table;
+
+ acpi_srat_revision = srat->header.revision;
+
+ /* Real work done in acpi_table_parse_srat below. */
+
+ return 0;
+}
+
+static int __init
+acpi_table_parse_srat(enum acpi_srat_type id,
+ acpi_tbl_entry_handler handler, unsigned int max_entries)
+{
+ return acpi_table_parse_entries(ACPI_SIG_SRAT,
+ sizeof(struct acpi_table_srat), id,
+ handler, max_entries);
+}
+
+int __init acpi_numa_init(void)
+{
+ int cnt = 0;
+
+ /*
+ * Should not limit number with cpu num that is from NR_CPUS or nr_cpus=
+ * SRAT cpu entries could have different order with that in MADT.
+ * So go over all cpu entries in SRAT to get apicid to node mapping.
+ */
+
+ /* SRAT: Static Resource Affinity Table */
+ if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
+ acpi_table_parse_srat(ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY,
+ acpi_parse_x2apic_affinity, 0);
+ acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
+ acpi_parse_processor_affinity, 0);
+ cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
+ acpi_parse_memory_affinity,
+ NR_NODE_MEMBLKS);
+ }
+
+ /* SLIT: System Locality Information Table */
+ acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
+
+ acpi_numa_arch_fixup();
+
+ if (cnt < 0)
+ return cnt;
+ else if (!parsed_numa_memblks)
+ return -ENOENT;
+ return 0;
+}
+
+static int acpi_get_pxm(acpi_handle h)
+{
+ unsigned long long pxm;
+ acpi_status status;
+ acpi_handle handle;
+ acpi_handle phandle = h;
+
+ do {
+ handle = phandle;
+ status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
+ if (ACPI_SUCCESS(status))
+ return pxm;
+ status = acpi_get_parent(handle, &phandle);
+ } while (ACPI_SUCCESS(status));
+ return -1;
+}
+
+int acpi_get_node(acpi_handle handle)
+{
+ int pxm;
+
+ pxm = acpi_get_pxm(handle);
+ if (pxm < 0 || pxm >= MAX_PXM_DOMAINS)
+ return NUMA_NO_NODE;
+
+ return acpi_map_pxm_to_node(pxm);
+}
+EXPORT_SYMBOL(acpi_get_node);
Code Review / kvmfornfv.git / blobdiff