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Diffstat (limited to 'arch/x86/mm/discontig_32.c')
| -rw-r--r-- | arch/x86/mm/discontig_32.c | 431 |
1 files changed, 431 insertions, 0 deletions
diff --git a/arch/x86/mm/discontig_32.c b/arch/x86/mm/discontig_32.c new file mode 100644 index 00000000000..860e912a3fb --- /dev/null +++ b/arch/x86/mm/discontig_32.c @@ -0,0 +1,431 @@ +/* + * Written by: Patricia Gaughen <gone@us.ibm.com>, IBM Corporation + * August 2002: added remote node KVA remap - Martin J. Bligh + * + * Copyright (C) 2002, IBM Corp. + * + * All rights reserved. + * + * 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, GOOD TITLE or + * NON INFRINGEMENT. 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., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/mm.h> +#include <linux/bootmem.h> +#include <linux/mmzone.h> +#include <linux/highmem.h> +#include <linux/initrd.h> +#include <linux/nodemask.h> +#include <linux/module.h> +#include <linux/kexec.h> +#include <linux/pfn.h> +#include <linux/swap.h> + +#include <asm/e820.h> +#include <asm/setup.h> +#include <asm/mmzone.h> +#include <bios_ebda.h> + +struct pglist_data *node_data[MAX_NUMNODES] __read_mostly; +EXPORT_SYMBOL(node_data); +bootmem_data_t node0_bdata; + +/* + * numa interface - we expect the numa architecture specific code to have + * populated the following initialisation. + * + * 1) node_online_map - the map of all nodes configured (online) in the system + * 2) node_start_pfn - the starting page frame number for a node + * 3) node_end_pfn - the ending page fram number for a node + */ +unsigned long node_start_pfn[MAX_NUMNODES] __read_mostly; +unsigned long node_end_pfn[MAX_NUMNODES] __read_mostly; + + +#ifdef CONFIG_DISCONTIGMEM +/* + * 4) physnode_map - the mapping between a pfn and owning node + * physnode_map keeps track of the physical memory layout of a generic + * numa node on a 256Mb break (each element of the array will + * represent 256Mb of memory and will be marked by the node id. so, + * if the first gig is on node 0, and the second gig is on node 1 + * physnode_map will contain: + * + * physnode_map[0-3] = 0; + * physnode_map[4-7] = 1; + * physnode_map[8- ] = -1; + */ +s8 physnode_map[MAX_ELEMENTS] __read_mostly = { [0 ... (MAX_ELEMENTS - 1)] = -1}; +EXPORT_SYMBOL(physnode_map); + +void memory_present(int nid, unsigned long start, unsigned long end) +{ + unsigned long pfn; + + printk(KERN_INFO "Node: %d, start_pfn: %ld, end_pfn: %ld\n", + nid, start, end); + printk(KERN_DEBUG " Setting physnode_map array to node %d for pfns:\n", nid); + printk(KERN_DEBUG " "); + for (pfn = start; pfn < end; pfn += PAGES_PER_ELEMENT) { + physnode_map[pfn / PAGES_PER_ELEMENT] = nid; + printk("%ld ", pfn); + } + printk("\n"); +} + +unsigned long node_memmap_size_bytes(int nid, unsigned long start_pfn, + unsigned long end_pfn) +{ + unsigned long nr_pages = end_pfn - start_pfn; + + if (!nr_pages) + return 0; + + return (nr_pages + 1) * sizeof(struct page); +} +#endif + +extern unsigned long find_max_low_pfn(void); +extern void add_one_highpage_init(struct page *, int, int); +extern unsigned long highend_pfn, highstart_pfn; + +#define LARGE_PAGE_BYTES (PTRS_PER_PTE * PAGE_SIZE) + +unsigned long node_remap_start_pfn[MAX_NUMNODES]; +unsigned long node_remap_size[MAX_NUMNODES]; +unsigned long node_remap_offset[MAX_NUMNODES]; +void *node_remap_start_vaddr[MAX_NUMNODES]; +void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags); + +void *node_remap_end_vaddr[MAX_NUMNODES]; +void *node_remap_alloc_vaddr[MAX_NUMNODES]; +static unsigned long kva_start_pfn; +static unsigned long kva_pages; +/* + * FLAT - support for basic PC memory model with discontig enabled, essentially + * a single node with all available processors in it with a flat + * memory map. + */ +int __init get_memcfg_numa_flat(void) +{ + printk("NUMA - single node, flat memory mode\n"); + + /* Run the memory configuration and find the top of memory. */ + find_max_pfn(); + node_start_pfn[0] = 0; + node_end_pfn[0] = max_pfn; + memory_present(0, 0, max_pfn); + + /* Indicate there is one node available. */ + nodes_clear(node_online_map); + node_set_online(0); + return 1; +} + +/* + * Find the highest page frame number we have available for the node + */ +static void __init find_max_pfn_node(int nid) +{ + if (node_end_pfn[nid] > max_pfn) + node_end_pfn[nid] = max_pfn; + /* + * if a user has given mem=XXXX, then we need to make sure + * that the node _starts_ before that, too, not just ends + */ + if (node_start_pfn[nid] > max_pfn) + node_start_pfn[nid] = max_pfn; + BUG_ON(node_start_pfn[nid] > node_end_pfn[nid]); +} + +/* + * Allocate memory for the pg_data_t for this node via a crude pre-bootmem + * method. For node zero take this from the bottom of memory, for + * subsequent nodes place them at node_remap_start_vaddr which contains + * node local data in physically node local memory. See setup_memory() + * for details. + */ +static void __init allocate_pgdat(int nid) +{ + if (nid && node_has_online_mem(nid)) + NODE_DATA(nid) = (pg_data_t *)node_remap_start_vaddr[nid]; + else { + NODE_DATA(nid) = (pg_data_t *)(pfn_to_kaddr(min_low_pfn)); + min_low_pfn += PFN_UP(sizeof(pg_data_t)); + } +} + +void *alloc_remap(int nid, unsigned long size) +{ + void *allocation = node_remap_alloc_vaddr[nid]; + + size = ALIGN(size, L1_CACHE_BYTES); + + if (!allocation || (allocation + size) >= node_remap_end_vaddr[nid]) + return 0; + + node_remap_alloc_vaddr[nid] += size; + memset(allocation, 0, size); + + return allocation; +} + +void __init remap_numa_kva(void) +{ + void *vaddr; + unsigned long pfn; + int node; + + for_each_online_node(node) { + for (pfn=0; pfn < node_remap_size[node]; pfn += PTRS_PER_PTE) { + vaddr = node_remap_start_vaddr[node]+(pfn<<PAGE_SHIFT); + set_pmd_pfn((ulong) vaddr, + node_remap_start_pfn[node] + pfn, + PAGE_KERNEL_LARGE); + } + } +} + +static unsigned long calculate_numa_remap_pages(void) +{ + int nid; + unsigned long size, reserve_pages = 0; + unsigned long pfn; + + for_each_online_node(nid) { + unsigned old_end_pfn = node_end_pfn[nid]; + + /* + * The acpi/srat node info can show hot-add memroy zones + * where memory could be added but not currently present. + */ + if (node_start_pfn[nid] > max_pfn) + continue; + if (node_end_pfn[nid] > max_pfn) + node_end_pfn[nid] = max_pfn; + + /* ensure the remap includes space for the pgdat. */ + size = node_remap_size[nid] + sizeof(pg_data_t); + + /* convert size to large (pmd size) pages, rounding up */ + size = (size + LARGE_PAGE_BYTES - 1) / LARGE_PAGE_BYTES; + /* now the roundup is correct, convert to PAGE_SIZE pages */ + size = size * PTRS_PER_PTE; + + /* + * Validate the region we are allocating only contains valid + * pages. + */ + for (pfn = node_end_pfn[nid] - size; + pfn < node_end_pfn[nid]; pfn++) + if (!page_is_ram(pfn)) + break; + + if (pfn != node_end_pfn[nid]) + size = 0; + + printk("Reserving %ld pages of KVA for lmem_map of node %d\n", + size, nid); + node_remap_size[nid] = size; + node_remap_offset[nid] = reserve_pages; + reserve_pages += size; + printk("Shrinking node %d from %ld pages to %ld pages\n", + nid, node_end_pfn[nid], node_end_pfn[nid] - size); + + if (node_end_pfn[nid] & (PTRS_PER_PTE-1)) { + /* + * Align node_end_pfn[] and node_remap_start_pfn[] to + * pmd boundary. remap_numa_kva will barf otherwise. + */ + printk("Shrinking node %d further by %ld pages for proper alignment\n", + nid, node_end_pfn[nid] & (PTRS_PER_PTE-1)); + size += node_end_pfn[nid] & (PTRS_PER_PTE-1); + } + + node_end_pfn[nid] -= size; + node_remap_start_pfn[nid] = node_end_pfn[nid]; + shrink_active_range(nid, old_end_pfn, node_end_pfn[nid]); + } + printk("Reserving total of %ld pages for numa KVA remap\n", + reserve_pages); + return reserve_pages; +} + +extern void setup_bootmem_allocator(void); +unsigned long __init setup_memory(void) +{ + int nid; + unsigned long system_start_pfn, system_max_low_pfn; + + /* + * When mapping a NUMA machine we allocate the node_mem_map arrays + * from node local memory. They are then mapped directly into KVA + * between zone normal and vmalloc space. Calculate the size of + * this space and use it to adjust the boundry between ZONE_NORMAL + * and ZONE_HIGHMEM. + */ + find_max_pfn(); + get_memcfg_numa(); + + kva_pages = calculate_numa_remap_pages(); + + /* partially used pages are not usable - thus round upwards */ + system_start_pfn = min_low_pfn = PFN_UP(init_pg_tables_end); + + kva_start_pfn = find_max_low_pfn() - kva_pages; + +#ifdef CONFIG_BLK_DEV_INITRD + /* Numa kva area is below the initrd */ + if (LOADER_TYPE && INITRD_START) + kva_start_pfn = PFN_DOWN(INITRD_START) - kva_pages; +#endif + kva_start_pfn -= kva_start_pfn & (PTRS_PER_PTE-1); + + system_max_low_pfn = max_low_pfn = find_max_low_pfn(); + printk("kva_start_pfn ~ %ld find_max_low_pfn() ~ %ld\n", + kva_start_pfn, max_low_pfn); + printk("max_pfn = %ld\n", max_pfn); +#ifdef CONFIG_HIGHMEM + highstart_pfn = highend_pfn = max_pfn; + if (max_pfn > system_max_low_pfn) + highstart_pfn = system_max_low_pfn; + printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", + pages_to_mb(highend_pfn - highstart_pfn)); + num_physpages = highend_pfn; + high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1; +#else + num_physpages = system_max_low_pfn; + high_memory = (void *) __va(system_max_low_pfn * PAGE_SIZE - 1) + 1; +#endif + printk(KERN_NOTICE "%ldMB LOWMEM available.\n", + pages_to_mb(system_max_low_pfn)); + printk("min_low_pfn = %ld, max_low_pfn = %ld, highstart_pfn = %ld\n", + min_low_pfn, max_low_pfn, highstart_pfn); + + printk("Low memory ends at vaddr %08lx\n", + (ulong) pfn_to_kaddr(max_low_pfn)); + for_each_online_node(nid) { + node_remap_start_vaddr[nid] = pfn_to_kaddr( + kva_start_pfn + node_remap_offset[nid]); + /* Init the node remap allocator */ + node_remap_end_vaddr[nid] = node_remap_start_vaddr[nid] + + (node_remap_size[nid] * PAGE_SIZE); + node_remap_alloc_vaddr[nid] = node_remap_start_vaddr[nid] + + ALIGN(sizeof(pg_data_t), PAGE_SIZE); + + allocate_pgdat(nid); + printk ("node %d will remap to vaddr %08lx - %08lx\n", nid, + (ulong) node_remap_start_vaddr[nid], + (ulong) pfn_to_kaddr(highstart_pfn + + node_remap_offset[nid] + node_remap_size[nid])); + } + printk("High memory starts at vaddr %08lx\n", + (ulong) pfn_to_kaddr(highstart_pfn)); + for_each_online_node(nid) + find_max_pfn_node(nid); + + memset(NODE_DATA(0), 0, sizeof(struct pglist_data)); + NODE_DATA(0)->bdata = &node0_bdata; + setup_bootmem_allocator(); + return max_low_pfn; +} + +void __init numa_kva_reserve(void) +{ + reserve_bootmem(PFN_PHYS(kva_start_pfn),PFN_PHYS(kva_pages)); +} + +void __init zone_sizes_init(void) +{ + int nid; + unsigned long max_zone_pfns[MAX_NR_ZONES]; + memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); + max_zone_pfns[ZONE_DMA] = + virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; + max_zone_pfns[ZONE_NORMAL] = max_low_pfn; +#ifdef CONFIG_HIGHMEM + max_zone_pfns[ZONE_HIGHMEM] = highend_pfn; +#endif + + /* If SRAT has not registered memory, register it now */ + if (find_max_pfn_with_active_regions() == 0) { + for_each_online_node(nid) { + if (node_has_online_mem(nid)) + add_active_range(nid, node_start_pfn[nid], + node_end_pfn[nid]); + } + } + + free_area_init_nodes(max_zone_pfns); + return; +} + +void __init set_highmem_pages_init(int bad_ppro) +{ +#ifdef CONFIG_HIGHMEM + struct zone *zone; + struct page *page; + + for_each_zone(zone) { + unsigned long node_pfn, zone_start_pfn, zone_end_pfn; + + if (!is_highmem(zone)) + continue; + + zone_start_pfn = zone->zone_start_pfn; + zone_end_pfn = zone_start_pfn + zone->spanned_pages; + + printk("Initializing %s for node %d (%08lx:%08lx)\n", + zone->name, zone_to_nid(zone), + zone_start_pfn, zone_end_pfn); + + for (node_pfn = zone_start_pfn; node_pfn < zone_end_pfn; node_pfn++) { + if (!pfn_valid(node_pfn)) + continue; + page = pfn_to_page(node_pfn); + add_one_highpage_init(page, node_pfn, bad_ppro); + } + } + totalram_pages += totalhigh_pages; +#endif +} + +#ifdef CONFIG_MEMORY_HOTPLUG +int paddr_to_nid(u64 addr) +{ + int nid; + unsigned long pfn = PFN_DOWN(addr); + + for_each_node(nid) + if (node_start_pfn[nid] <= pfn && + pfn < node_end_pfn[nid]) + return nid; + + return -1; +} + +/* + * This function is used to ask node id BEFORE memmap and mem_section's + * initialization (pfn_to_nid() can't be used yet). + * If _PXM is not defined on ACPI's DSDT, node id must be found by this. + */ +int memory_add_physaddr_to_nid(u64 addr) +{ + int nid = paddr_to_nid(addr); + return (nid >= 0) ? nid : 0; +} + +EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); +#endif |