463 lines
13 KiB
C
463 lines
13 KiB
C
/*
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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/config.h>
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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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/*
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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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#define MAX_PXM_DOMAINS 256 /* 1 byte and no promises about values */
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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 pxm_bitmap[PXM_BITMAP_LEN]; /* bitmap of proximity domains */
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#define MAX_CHUNKS_PER_NODE 4
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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 node_memory_chunk[MAXCHUNKS];
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static int num_memory_chunks; /* total number of memory chunks */
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static int zholes_size_init;
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static unsigned long zholes_size[MAX_NUMNODES * MAX_NR_ZONES];
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extern void * boot_ioremap(unsigned long, unsigned long);
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/* Identify CPU proximity domains */
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static void __init parse_cpu_affinity_structure(char *p)
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{
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struct acpi_table_processor_affinity *cpu_affinity =
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(struct acpi_table_processor_affinity *) p;
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if (!cpu_affinity->flags.enabled)
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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);
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printk("CPU 0x%02X in proximity domain 0x%02X\n",
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cpu_affinity->apic_id, cpu_affinity->proximity_domain);
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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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static void __init parse_memory_affinity_structure (char *sratp)
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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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struct acpi_table_memory_affinity *memory_affinity =
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(struct acpi_table_memory_affinity *) sratp;
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if (!memory_affinity->flags.enabled)
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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, memory_affinity->proximity_domain);
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/* calculate info for memory chunk structure */
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paddr = memory_affinity->base_addr_hi;
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paddr = (paddr << 32) | memory_affinity->base_addr_lo;
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size = memory_affinity->length_hi;
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size = (size << 32) | memory_affinity->length_lo;
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start_pfn = paddr >> PAGE_SHIFT;
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end_pfn = (paddr + size) >> PAGE_SHIFT;
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pxm = memory_affinity->proximity_domain;
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if (num_memory_chunks >= MAXCHUNKS) {
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printk("Too many mem chunks in SRAT. 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("Memory range 0x%lX to 0x%lX (type 0x%X) in proximity domain 0x%02X %s\n",
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start_pfn, end_pfn,
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memory_affinity->memory_type,
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memory_affinity->proximity_domain,
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(memory_affinity->flags.hot_pluggable ?
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"enabled and removable" : "enabled" ) );
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}
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#if MAX_NR_ZONES != 3
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#error "MAX_NR_ZONES != 3, chunk_to_zone requires review"
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#endif
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/* Take a chunk of pages from page frame cstart to cend and count the number
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* of pages in each zone, returned via zones[].
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*/
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static __init void chunk_to_zones(unsigned long cstart, unsigned long cend,
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unsigned long *zones)
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{
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unsigned long max_dma;
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extern unsigned long max_low_pfn;
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int z;
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unsigned long rend;
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/* FIXME: MAX_DMA_ADDRESS and max_low_pfn are trying to provide
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* similarly scoped information and should be handled in a consistant
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* manner.
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*/
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max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
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/* Split the hole into the zones in which it falls. Repeatedly
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* take the segment in which the remaining hole starts, round it
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* to the end of that zone.
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*/
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memset(zones, 0, MAX_NR_ZONES * sizeof(long));
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while (cstart < cend) {
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if (cstart < max_dma) {
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z = ZONE_DMA;
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rend = (cend < max_dma)? cend : max_dma;
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} else if (cstart < max_low_pfn) {
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z = ZONE_NORMAL;
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rend = (cend < max_low_pfn)? cend : max_low_pfn;
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} else {
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z = ZONE_HIGHMEM;
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rend = cend;
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}
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zones[z] += rend - cstart;
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cstart = rend;
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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 void 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: 0x%08lx -> %08lx\n",
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memory_chunk->start_pfn, memory_chunk->end_pfn);
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return;
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}
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if (memory_chunk->nid != nid)
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return;
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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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}
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static u8 pxm_to_nid_map[MAX_PXM_DOMAINS];/* _PXM to logical node ID map */
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int pxm_to_node(int pxm)
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{
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return pxm_to_nid_map[pxm];
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}
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/* Parse the ACPI Static Resource Affinity Table */
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static int __init acpi20_parse_srat(struct acpi_table_srat *sratp)
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{
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u8 *start, *end, *p;
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int i, j, nid;
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u8 nid_to_pxm_map[MAX_NUMNODES];/* logical node ID to _PXM map */
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start = (u8 *)(&(sratp->reserved) + 1); /* skip header */
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p = start;
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end = (u8 *)sratp + sratp->header.length;
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memset(pxm_bitmap, 0, sizeof(pxm_bitmap)); /* init proximity domain bitmap */
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memset(node_memory_chunk, 0, sizeof(node_memory_chunk));
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memset(zholes_size, 0, sizeof(zholes_size));
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/* -1 in these maps means not available */
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memset(pxm_to_nid_map, -1, sizeof(pxm_to_nid_map));
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memset(nid_to_pxm_map, -1, sizeof(nid_to_pxm_map));
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num_memory_chunks = 0;
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while (p < end) {
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switch (*p) {
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case ACPI_SRAT_PROCESSOR_AFFINITY:
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parse_cpu_affinity_structure(p);
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break;
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case ACPI_SRAT_MEMORY_AFFINITY:
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parse_memory_affinity_structure(p);
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break;
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default:
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printk("ACPI 2.0 SRAT: unknown entry skipped: type=0x%02X, len=%d\n", p[0], p[1]);
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break;
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}
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p += p[1];
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if (p[1] == 0) {
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printk("acpi20_parse_srat: Entry length value is zero;"
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" can't parse any further!\n");
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break;
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}
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}
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if (num_memory_chunks == 0) {
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printk("could not finy 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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nid = num_online_nodes();
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pxm_to_nid_map[i] = nid;
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nid_to_pxm_map[nid] = 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_nid_map[node_memory_chunk[i].pxm];
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printk("pxm bitmap: ");
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for (i = 0; i < sizeof(pxm_bitmap); i++) {
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printk("%02X ", pxm_bitmap[i]);
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}
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printk("\n");
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printk("Number of logical nodes in system = %d\n", num_online_nodes());
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printk("Number of memory chunks in system = %d\n", num_memory_chunks);
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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("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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node_read_chunk(chunk->nid, chunk);
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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 = node_end_pfn[nid];
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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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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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struct acpi_table_header *header = NULL;
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struct acpi_table_rsdp *rsdp = NULL;
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struct acpi_table_rsdt *rsdt = NULL;
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struct acpi_pointer *rsdp_address = NULL;
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struct acpi_table_rsdt saved_rsdt;
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int tables = 0;
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int i = 0;
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acpi_find_root_pointer(ACPI_PHYSICAL_ADDRESSING, rsdp_address);
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if (rsdp_address->pointer_type == ACPI_PHYSICAL_POINTER) {
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printk("%s: assigning address to rsdp\n", __FUNCTION__);
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rsdp = (struct acpi_table_rsdp *)
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(u32)rsdp_address->pointer.physical;
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} else {
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printk("%s: rsdp_address is not a physical pointer\n", __FUNCTION__);
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goto out_err;
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}
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if (!rsdp) {
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printk("%s: Didn't find ACPI root!\n", __FUNCTION__);
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goto out_err;
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}
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printk(KERN_INFO "%.8s v%d [%.6s]\n", rsdp->signature, rsdp->revision,
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rsdp->oem_id);
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if (strncmp(rsdp->signature, RSDP_SIG,strlen(RSDP_SIG))) {
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printk(KERN_WARNING "%s: RSDP table signature incorrect\n", __FUNCTION__);
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goto out_err;
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}
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rsdt = (struct acpi_table_rsdt *)
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boot_ioremap(rsdp->rsdt_address, sizeof(struct acpi_table_rsdt));
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if (!rsdt) {
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printk(KERN_WARNING
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"%s: ACPI: Invalid root system description tables (RSDT)\n",
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__FUNCTION__);
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goto out_err;
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}
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header = & rsdt->header;
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if (strncmp(header->signature, RSDT_SIG, strlen(RSDT_SIG))) {
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printk(KERN_WARNING "ACPI: RSDT signature incorrect\n");
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goto out_err;
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}
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/*
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* The number of tables is computed by taking the
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* size of all entries (header size minus total
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* size of RSDT) divided by the size of each entry
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* (4-byte table pointers).
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*/
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tables = (header->length - sizeof(struct acpi_table_header)) / 4;
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if (!tables)
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goto out_err;
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memcpy(&saved_rsdt, rsdt, sizeof(saved_rsdt));
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if (saved_rsdt.header.length > sizeof(saved_rsdt)) {
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printk(KERN_WARNING "ACPI: Too big length in RSDT: %d\n",
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saved_rsdt.header.length);
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goto out_err;
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}
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printk("Begin SRAT table scan....\n");
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for (i = 0; i < tables; i++) {
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/* Map in header, then map in full table length. */
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header = (struct acpi_table_header *)
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boot_ioremap(saved_rsdt.entry[i], sizeof(struct acpi_table_header));
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if (!header)
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break;
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header = (struct acpi_table_header *)
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boot_ioremap(saved_rsdt.entry[i], header->length);
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if (!header)
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break;
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if (strncmp((char *) &header->signature, "SRAT", 4))
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continue;
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/* we've found the srat table. don't need to look at any more tables */
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return acpi20_parse_srat((struct acpi_table_srat *)header);
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}
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out_err:
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printk("failed to get NUMA memory information from SRAT table\n");
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return 0;
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}
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/* For each node run the memory list to determine whether there are
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* any memory holes. For each hole determine which ZONE they fall
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* into.
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*
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* NOTE#1: this requires knowledge of the zone boundries and so
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* _cannot_ be performed before those are calculated in setup_memory.
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*
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* NOTE#2: we rely on the fact that the memory chunks are ordered by
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* start pfn number during setup.
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*/
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static void __init get_zholes_init(void)
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{
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int nid;
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int c;
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int first;
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unsigned long end = 0;
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for_each_online_node(nid) {
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first = 1;
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for (c = 0; c < num_memory_chunks; c++){
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if (node_memory_chunk[c].nid == nid) {
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if (first) {
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end = node_memory_chunk[c].end_pfn;
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first = 0;
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} else {
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/* Record any gap between this chunk
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* and the previous chunk on this node
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* against the zones it spans.
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*/
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chunk_to_zones(end,
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node_memory_chunk[c].start_pfn,
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&zholes_size[nid * MAX_NR_ZONES]);
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}
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}
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}
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}
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}
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unsigned long * __init get_zholes_size(int nid)
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{
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if (!zholes_size_init) {
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zholes_size_init++;
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get_zholes_init();
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}
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if (nid >= MAX_NUMNODES || !node_online(nid))
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printk("%s: nid = %d is invalid/offline. num_online_nodes = %d",
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__FUNCTION__, nid, num_online_nodes());
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return &zholes_size[nid * MAX_NR_ZONES];
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}
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