284 lines
8.0 KiB
C
284 lines
8.0 KiB
C
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/*
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* Some of the code in this file has been gleaned from the 64 bit
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* discontigmem support code base.
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*
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* Copyright (C) 2002, IBM Corp.
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to Pat Gaughen <gone@us.ibm.com>
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*/
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#include <linux/mm.h>
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#include <linux/bootmem.h>
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#include <linux/mmzone.h>
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#include <linux/acpi.h>
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#include <linux/nodemask.h>
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#include <asm/srat.h>
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#include <asm/topology.h>
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#include <asm/smp.h>
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#include <asm/e820.h>
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/*
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* proximity macros and definitions
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*/
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#define NODE_ARRAY_INDEX(x) ((x) / 8) /* 8 bits/char */
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#define NODE_ARRAY_OFFSET(x) ((x) % 8) /* 8 bits/char */
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#define BMAP_SET(bmap, bit) ((bmap)[NODE_ARRAY_INDEX(bit)] |= 1 << NODE_ARRAY_OFFSET(bit))
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#define BMAP_TEST(bmap, bit) ((bmap)[NODE_ARRAY_INDEX(bit)] & (1 << NODE_ARRAY_OFFSET(bit)))
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/* bitmap length; _PXM is at most 255 */
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#define PXM_BITMAP_LEN (MAX_PXM_DOMAINS / 8)
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static u8 __initdata pxm_bitmap[PXM_BITMAP_LEN]; /* bitmap of proximity domains */
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#define MAX_CHUNKS_PER_NODE 3
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#define MAXCHUNKS (MAX_CHUNKS_PER_NODE * MAX_NUMNODES)
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struct node_memory_chunk_s {
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unsigned long start_pfn;
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unsigned long end_pfn;
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u8 pxm; // proximity domain of node
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u8 nid; // which cnode contains this chunk?
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u8 bank; // which mem bank on this node
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};
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static struct node_memory_chunk_s __initdata node_memory_chunk[MAXCHUNKS];
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static int __initdata num_memory_chunks; /* total number of memory chunks */
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static u8 __initdata apicid_to_pxm[MAX_APICID];
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int numa_off __initdata;
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int acpi_numa __initdata;
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static __init void bad_srat(void)
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{
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printk(KERN_ERR "SRAT: SRAT not used.\n");
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acpi_numa = -1;
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num_memory_chunks = 0;
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}
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static __init inline int srat_disabled(void)
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{
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return numa_off || acpi_numa < 0;
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}
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/* Identify CPU proximity domains */
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void __init
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acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *cpu_affinity)
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{
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if (srat_disabled())
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return;
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if (cpu_affinity->header.length !=
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sizeof(struct acpi_srat_cpu_affinity)) {
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bad_srat();
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return;
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}
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if ((cpu_affinity->flags & ACPI_SRAT_CPU_ENABLED) == 0)
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return; /* empty entry */
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/* mark this node as "seen" in node bitmap */
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BMAP_SET(pxm_bitmap, cpu_affinity->proximity_domain_lo);
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apicid_to_pxm[cpu_affinity->apic_id] = cpu_affinity->proximity_domain_lo;
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printk(KERN_DEBUG "CPU %02x in proximity domain %02x\n",
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cpu_affinity->apic_id, cpu_affinity->proximity_domain_lo);
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}
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/*
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* Identify memory proximity domains and hot-remove capabilities.
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* Fill node memory chunk list structure.
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*/
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void __init
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acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *memory_affinity)
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{
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unsigned long long paddr, size;
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unsigned long start_pfn, end_pfn;
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u8 pxm;
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struct node_memory_chunk_s *p, *q, *pend;
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if (srat_disabled())
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return;
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if (memory_affinity->header.length !=
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sizeof(struct acpi_srat_mem_affinity)) {
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bad_srat();
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return;
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}
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if ((memory_affinity->flags & ACPI_SRAT_MEM_ENABLED) == 0)
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return; /* empty entry */
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pxm = memory_affinity->proximity_domain & 0xff;
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/* mark this node as "seen" in node bitmap */
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BMAP_SET(pxm_bitmap, pxm);
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/* calculate info for memory chunk structure */
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paddr = memory_affinity->base_address;
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size = memory_affinity->length;
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start_pfn = paddr >> PAGE_SHIFT;
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end_pfn = (paddr + size) >> PAGE_SHIFT;
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if (num_memory_chunks >= MAXCHUNKS) {
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printk(KERN_WARNING "Too many mem chunks in SRAT."
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" Ignoring %lld MBytes at %llx\n",
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size/(1024*1024), paddr);
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return;
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}
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/* Insertion sort based on base address */
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pend = &node_memory_chunk[num_memory_chunks];
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for (p = &node_memory_chunk[0]; p < pend; p++) {
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if (start_pfn < p->start_pfn)
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break;
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}
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if (p < pend) {
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for (q = pend; q >= p; q--)
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*(q + 1) = *q;
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}
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p->start_pfn = start_pfn;
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p->end_pfn = end_pfn;
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p->pxm = pxm;
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num_memory_chunks++;
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printk(KERN_DEBUG "Memory range %08lx to %08lx"
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" in proximity domain %02x %s\n",
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start_pfn, end_pfn,
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pxm,
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((memory_affinity->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) ?
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"enabled and removable" : "enabled" ) );
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}
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/* Callback for SLIT parsing */
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void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
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{
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}
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void acpi_numa_arch_fixup(void)
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{
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}
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/*
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* The SRAT table always lists ascending addresses, so can always
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* assume that the first "start" address that you see is the real
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* start of the node, and that the current "end" address is after
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* the previous one.
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*/
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static __init int node_read_chunk(int nid, struct node_memory_chunk_s *memory_chunk)
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{
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/*
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* Only add present memory as told by the e820.
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* There is no guarantee from the SRAT that the memory it
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* enumerates is present at boot time because it represents
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* *possible* memory hotplug areas the same as normal RAM.
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*/
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if (memory_chunk->start_pfn >= max_pfn) {
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printk(KERN_INFO "Ignoring SRAT pfns: %08lx - %08lx\n",
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memory_chunk->start_pfn, memory_chunk->end_pfn);
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return -1;
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}
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if (memory_chunk->nid != nid)
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return -1;
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if (!node_has_online_mem(nid))
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node_start_pfn[nid] = memory_chunk->start_pfn;
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if (node_start_pfn[nid] > memory_chunk->start_pfn)
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node_start_pfn[nid] = memory_chunk->start_pfn;
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if (node_end_pfn[nid] < memory_chunk->end_pfn)
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node_end_pfn[nid] = memory_chunk->end_pfn;
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return 0;
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}
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int __init get_memcfg_from_srat(void)
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{
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int i, j, nid;
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if (srat_disabled())
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goto out_fail;
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if (num_memory_chunks == 0) {
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printk(KERN_DEBUG
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"could not find any ACPI SRAT memory areas.\n");
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goto out_fail;
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}
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/* Calculate total number of nodes in system from PXM bitmap and create
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* a set of sequential node IDs starting at zero. (ACPI doesn't seem
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* to specify the range of _PXM values.)
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*/
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/*
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* MCD - we no longer HAVE to number nodes sequentially. PXM domain
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* numbers could go as high as 256, and MAX_NUMNODES for i386 is typically
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* 32, so we will continue numbering them in this manner until MAX_NUMNODES
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* approaches MAX_PXM_DOMAINS for i386.
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*/
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nodes_clear(node_online_map);
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for (i = 0; i < MAX_PXM_DOMAINS; i++) {
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if (BMAP_TEST(pxm_bitmap, i)) {
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int nid = acpi_map_pxm_to_node(i);
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node_set_online(nid);
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}
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}
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BUG_ON(num_online_nodes() == 0);
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/* set cnode id in memory chunk structure */
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for (i = 0; i < num_memory_chunks; i++)
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node_memory_chunk[i].nid = pxm_to_node(node_memory_chunk[i].pxm);
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printk(KERN_DEBUG "pxm bitmap: ");
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for (i = 0; i < sizeof(pxm_bitmap); i++) {
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printk(KERN_CONT "%02x ", pxm_bitmap[i]);
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}
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printk(KERN_CONT "\n");
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printk(KERN_DEBUG "Number of logical nodes in system = %d\n",
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num_online_nodes());
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printk(KERN_DEBUG "Number of memory chunks in system = %d\n",
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num_memory_chunks);
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for (i = 0; i < MAX_APICID; i++)
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apicid_2_node[i] = pxm_to_node(apicid_to_pxm[i]);
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for (j = 0; j < num_memory_chunks; j++){
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struct node_memory_chunk_s * chunk = &node_memory_chunk[j];
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printk(KERN_DEBUG
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"chunk %d nid %d start_pfn %08lx end_pfn %08lx\n",
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j, chunk->nid, chunk->start_pfn, chunk->end_pfn);
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if (node_read_chunk(chunk->nid, chunk))
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continue;
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e820_register_active_regions(chunk->nid, chunk->start_pfn,
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min(chunk->end_pfn, max_pfn));
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}
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for_each_online_node(nid) {
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unsigned long start = node_start_pfn[nid];
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unsigned long end = min(node_end_pfn[nid], max_pfn);
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memory_present(nid, start, end);
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node_remap_size[nid] = node_memmap_size_bytes(nid, start, end);
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}
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return 1;
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out_fail:
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printk(KERN_DEBUG "failed to get NUMA memory information from SRAT"
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" table\n");
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return 0;
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}
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