| /* |
| * 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/memblock.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 <linux/acpi.h> |
| |
| #include <asm/e820.h> |
| #include <asm/setup.h> |
| #include <asm/mmzone.h> |
| #include <asm/bios_ebda.h> |
| #include <asm/proto.h> |
| |
| struct pglist_data *node_data[MAX_NUMNODES] __read_mostly; |
| EXPORT_SYMBOL(node_data); |
| |
| /* |
| * 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 64Mb break (each element of the array will |
| * represent 64Mb 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[0-15] = 0; |
| * physnode_map[16-31] = 1; |
| * physnode_map[32- ] = -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: %lx, end_pfn: %lx\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(KERN_CONT "%lx ", pfn); |
| } |
| printk(KERN_CONT "\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 unsigned long highend_pfn, highstart_pfn; |
| |
| #define LARGE_PAGE_BYTES (PTRS_PER_PTE * PAGE_SIZE) |
| |
| unsigned long node_remap_size[MAX_NUMNODES]; |
| static void *node_remap_start_vaddr[MAX_NUMNODES]; |
| void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags); |
| |
| 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(KERN_DEBUG "NUMA - single node, flat memory mode\n"); |
| |
| node_start_pfn[0] = 0; |
| node_end_pfn[0] = max_pfn; |
| memblock_x86_register_active_regions(0, 0, max_pfn); |
| memory_present(0, 0, max_pfn); |
| node_remap_size[0] = node_memmap_size_bytes(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 propagate_e820_map_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) |
| { |
| char buf[16]; |
| |
| if (node_has_online_mem(nid) && node_remap_start_vaddr[nid]) |
| NODE_DATA(nid) = (pg_data_t *)node_remap_start_vaddr[nid]; |
| else { |
| unsigned long pgdat_phys; |
| pgdat_phys = memblock_find_in_range(min_low_pfn<<PAGE_SHIFT, |
| max_pfn_mapped<<PAGE_SHIFT, |
| sizeof(pg_data_t), |
| PAGE_SIZE); |
| NODE_DATA(nid) = (pg_data_t *)(pfn_to_kaddr(pgdat_phys>>PAGE_SHIFT)); |
| memset(buf, 0, sizeof(buf)); |
| sprintf(buf, "NODE_DATA %d", nid); |
| memblock_x86_reserve_range(pgdat_phys, pgdat_phys + sizeof(pg_data_t), buf); |
| } |
| printk(KERN_DEBUG "allocate_pgdat: node %d NODE_DATA %08lx\n", |
| nid, (unsigned long)NODE_DATA(nid)); |
| } |
| |
| /* |
| * In the DISCONTIGMEM and SPARSEMEM memory model, a portion of the kernel |
| * virtual address space (KVA) is reserved and portions of nodes are mapped |
| * using it. This is to allow node-local memory to be allocated for |
| * structures that would normally require ZONE_NORMAL. The memory is |
| * allocated with alloc_remap() and callers should be prepared to allocate |
| * from the bootmem allocator instead. |
| */ |
| static unsigned long node_remap_start_pfn[MAX_NUMNODES]; |
| static void *node_remap_end_vaddr[MAX_NUMNODES]; |
| static void *node_remap_alloc_vaddr[MAX_NUMNODES]; |
| static unsigned long node_remap_offset[MAX_NUMNODES]; |
| |
| 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 NULL; |
| |
| node_remap_alloc_vaddr[nid] += size; |
| memset(allocation, 0, size); |
| |
| return allocation; |
| } |
| |
| static void __init remap_numa_kva(void) |
| { |
| void *vaddr; |
| unsigned long pfn; |
| int node; |
| |
| for_each_online_node(node) { |
| printk(KERN_DEBUG "remap_numa_kva: node %d\n", node); |
| for (pfn=0; pfn < node_remap_size[node]; pfn += PTRS_PER_PTE) { |
| vaddr = node_remap_start_vaddr[node]+(pfn<<PAGE_SHIFT); |
| printk(KERN_DEBUG "remap_numa_kva: %08lx to pfn %08lx\n", |
| (unsigned long)vaddr, |
| node_remap_start_pfn[node] + pfn); |
| set_pmd_pfn((ulong) vaddr, |
| node_remap_start_pfn[node] + pfn, |
| PAGE_KERNEL_LARGE); |
| } |
| } |
| } |
| |
| #ifdef CONFIG_HIBERNATION |
| /** |
| * resume_map_numa_kva - add KVA mapping to the temporary page tables created |
| * during resume from hibernation |
| * @pgd_base - temporary resume page directory |
| */ |
| void resume_map_numa_kva(pgd_t *pgd_base) |
| { |
| int node; |
| |
| for_each_online_node(node) { |
| unsigned long start_va, start_pfn, size, pfn; |
| |
| start_va = (unsigned long)node_remap_start_vaddr[node]; |
| start_pfn = node_remap_start_pfn[node]; |
| size = node_remap_size[node]; |
| |
| printk(KERN_DEBUG "%s: node %d\n", __func__, node); |
| |
| for (pfn = 0; pfn < size; pfn += PTRS_PER_PTE) { |
| unsigned long vaddr = start_va + (pfn << PAGE_SHIFT); |
| pgd_t *pgd = pgd_base + pgd_index(vaddr); |
| pud_t *pud = pud_offset(pgd, vaddr); |
| pmd_t *pmd = pmd_offset(pud, vaddr); |
| |
| set_pmd(pmd, pfn_pmd(start_pfn + pfn, |
| PAGE_KERNEL_LARGE_EXEC)); |
| |
| printk(KERN_DEBUG "%s: %08lx -> pfn %08lx\n", |
| __func__, vaddr, start_pfn + pfn); |
| } |
| } |
| } |
| #endif |
| |
| static __init unsigned long calculate_numa_remap_pages(void) |
| { |
| int nid; |
| unsigned long size, reserve_pages = 0; |
| |
| for_each_online_node(nid) { |
| u64 node_kva_target; |
| u64 node_kva_final; |
| |
| /* |
| * The acpi/srat node info can show hot-add memroy zones |
| * where memory could be added but not currently present. |
| */ |
| printk(KERN_DEBUG "node %d pfn: [%lx - %lx]\n", |
| nid, node_start_pfn[nid], node_end_pfn[nid]); |
| if (node_start_pfn[nid] > max_pfn) |
| continue; |
| if (!node_end_pfn[nid]) |
| 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; |
| |
| node_kva_target = round_down(node_end_pfn[nid] - size, |
| PTRS_PER_PTE); |
| node_kva_target <<= PAGE_SHIFT; |
| do { |
| node_kva_final = memblock_find_in_range(node_kva_target, |
| ((u64)node_end_pfn[nid])<<PAGE_SHIFT, |
| ((u64)size)<<PAGE_SHIFT, |
| LARGE_PAGE_BYTES); |
| node_kva_target -= LARGE_PAGE_BYTES; |
| } while (node_kva_final == MEMBLOCK_ERROR && |
| (node_kva_target>>PAGE_SHIFT) > (node_start_pfn[nid])); |
| |
| if (node_kva_final == MEMBLOCK_ERROR) |
| panic("Can not get kva ram\n"); |
| |
| node_remap_size[nid] = size; |
| node_remap_offset[nid] = reserve_pages; |
| reserve_pages += size; |
| printk(KERN_DEBUG "Reserving %ld pages of KVA for lmem_map of" |
| " node %d at %llx\n", |
| size, nid, node_kva_final>>PAGE_SHIFT); |
| |
| /* |
| * prevent kva address below max_low_pfn want it on system |
| * with less memory later. |
| * layout will be: KVA address , KVA RAM |
| * |
| * we are supposed to only record the one less then max_low_pfn |
| * but we could have some hole in high memory, and it will only |
| * check page_is_ram(pfn) && !page_is_reserved_early(pfn) to decide |
| * to use it as free. |
| * So memblock_x86_reserve_range here, hope we don't run out of that array |
| */ |
| memblock_x86_reserve_range(node_kva_final, |
| node_kva_final+(((u64)size)<<PAGE_SHIFT), |
| "KVA RAM"); |
| |
| node_remap_start_pfn[nid] = node_kva_final>>PAGE_SHIFT; |
| remove_active_range(nid, node_remap_start_pfn[nid], |
| node_remap_start_pfn[nid] + size); |
| } |
| printk(KERN_INFO "Reserving total of %lx pages for numa KVA remap\n", |
| reserve_pages); |
| return reserve_pages; |
| } |
| |
| static void init_remap_allocator(int nid) |
| { |
| node_remap_start_vaddr[nid] = pfn_to_kaddr( |
| kva_start_pfn + node_remap_offset[nid]); |
| 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); |
| |
| printk(KERN_DEBUG "node %d will remap to vaddr %08lx - %08lx\n", nid, |
| (ulong) node_remap_start_vaddr[nid], |
| (ulong) node_remap_end_vaddr[nid]); |
| } |
| |
| void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn, |
| int acpi, int k8) |
| { |
| int nid; |
| long kva_target_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 boundary between ZONE_NORMAL |
| * and ZONE_HIGHMEM. |
| */ |
| |
| get_memcfg_numa(); |
| |
| kva_pages = roundup(calculate_numa_remap_pages(), PTRS_PER_PTE); |
| |
| kva_target_pfn = round_down(max_low_pfn - kva_pages, PTRS_PER_PTE); |
| do { |
| kva_start_pfn = memblock_find_in_range(kva_target_pfn<<PAGE_SHIFT, |
| max_low_pfn<<PAGE_SHIFT, |
| kva_pages<<PAGE_SHIFT, |
| PTRS_PER_PTE<<PAGE_SHIFT) >> PAGE_SHIFT; |
| kva_target_pfn -= PTRS_PER_PTE; |
| } while (kva_start_pfn == MEMBLOCK_ERROR && kva_target_pfn > min_low_pfn); |
| |
| if (kva_start_pfn == MEMBLOCK_ERROR) |
| panic("Can not get kva space\n"); |
| |
| printk(KERN_INFO "kva_start_pfn ~ %lx max_low_pfn ~ %lx\n", |
| kva_start_pfn, max_low_pfn); |
| printk(KERN_INFO "max_pfn = %lx\n", max_pfn); |
| |
| /* avoid clash with initrd */ |
| memblock_x86_reserve_range(kva_start_pfn<<PAGE_SHIFT, |
| (kva_start_pfn + kva_pages)<<PAGE_SHIFT, |
| "KVA PG"); |
| #ifdef CONFIG_HIGHMEM |
| highstart_pfn = highend_pfn = max_pfn; |
| if (max_pfn > max_low_pfn) |
| highstart_pfn = 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 = max_low_pfn; |
| high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1; |
| #endif |
| printk(KERN_NOTICE "%ldMB LOWMEM available.\n", |
| pages_to_mb(max_low_pfn)); |
| printk(KERN_DEBUG "max_low_pfn = %lx, highstart_pfn = %lx\n", |
| max_low_pfn, highstart_pfn); |
| |
| printk(KERN_DEBUG "Low memory ends at vaddr %08lx\n", |
| (ulong) pfn_to_kaddr(max_low_pfn)); |
| for_each_online_node(nid) { |
| init_remap_allocator(nid); |
| |
| allocate_pgdat(nid); |
| } |
| remap_numa_kva(); |
| |
| printk(KERN_DEBUG "High memory starts at vaddr %08lx\n", |
| (ulong) pfn_to_kaddr(highstart_pfn)); |
| for_each_online_node(nid) |
| propagate_e820_map_node(nid); |
| |
| for_each_online_node(nid) { |
| memset(NODE_DATA(nid), 0, sizeof(struct pglist_data)); |
| NODE_DATA(nid)->node_id = nid; |
| } |
| |
| setup_bootmem_allocator(); |
| } |
| |
| #ifdef CONFIG_MEMORY_HOTPLUG |
| static 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 |
| |