266 lines
8.3 KiB
C
266 lines
8.3 KiB
C
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/*
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* Written by: Patricia Gaughen <gone@us.ibm.com>, IBM Corporation
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* August 2002: added remote node KVA remap - Martin J. Bligh
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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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#include <linux/bootmem.h>
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#include <linux/memblock.h>
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#include <linux/module.h>
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#include "numa_internal.h"
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#ifdef CONFIG_DISCONTIGMEM
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/*
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* 4) physnode_map - the mapping between a pfn and owning node
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* physnode_map keeps track of the physical memory layout of a generic
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* numa node on a 64Mb break (each element of the array will
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* represent 64Mb of memory and will be marked by the node id. so,
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* if the first gig is on node 0, and the second gig is on node 1
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* physnode_map will contain:
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*
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* physnode_map[0-15] = 0;
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* physnode_map[16-31] = 1;
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* physnode_map[32- ] = -1;
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*/
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s8 physnode_map[MAX_SECTIONS] __read_mostly = { [0 ... (MAX_SECTIONS - 1)] = -1};
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EXPORT_SYMBOL(physnode_map);
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void memory_present(int nid, unsigned long start, unsigned long end)
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{
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unsigned long pfn;
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printk(KERN_INFO "Node: %d, start_pfn: %lx, end_pfn: %lx\n",
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nid, start, end);
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printk(KERN_DEBUG " Setting physnode_map array to node %d for pfns:\n", nid);
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printk(KERN_DEBUG " ");
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for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) {
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physnode_map[pfn / PAGES_PER_SECTION] = nid;
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printk(KERN_CONT "%lx ", pfn);
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}
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printk(KERN_CONT "\n");
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}
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unsigned long node_memmap_size_bytes(int nid, unsigned long start_pfn,
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unsigned long end_pfn)
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{
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unsigned long nr_pages = end_pfn - start_pfn;
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if (!nr_pages)
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return 0;
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return (nr_pages + 1) * sizeof(struct page);
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}
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#endif
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extern unsigned long highend_pfn, highstart_pfn;
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#define LARGE_PAGE_BYTES (PTRS_PER_PTE * PAGE_SIZE)
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static void *node_remap_start_vaddr[MAX_NUMNODES];
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void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags);
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/*
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* Remap memory allocator
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*/
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static unsigned long node_remap_start_pfn[MAX_NUMNODES];
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static void *node_remap_end_vaddr[MAX_NUMNODES];
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static void *node_remap_alloc_vaddr[MAX_NUMNODES];
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/**
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* alloc_remap - Allocate remapped memory
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* @nid: NUMA node to allocate memory from
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* @size: The size of allocation
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*
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* Allocate @size bytes from the remap area of NUMA node @nid. The
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* size of the remap area is predetermined by init_alloc_remap() and
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* only the callers considered there should call this function. For
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* more info, please read the comment on top of init_alloc_remap().
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*
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* The caller must be ready to handle allocation failure from this
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* function and fall back to regular memory allocator in such cases.
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*
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* CONTEXT:
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* Single CPU early boot context.
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*
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* RETURNS:
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* Pointer to the allocated memory on success, %NULL on failure.
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*/
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void *alloc_remap(int nid, unsigned long size)
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{
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void *allocation = node_remap_alloc_vaddr[nid];
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size = ALIGN(size, L1_CACHE_BYTES);
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if (!allocation || (allocation + size) > node_remap_end_vaddr[nid])
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return NULL;
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node_remap_alloc_vaddr[nid] += size;
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memset(allocation, 0, size);
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return allocation;
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}
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#ifdef CONFIG_HIBERNATION
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/**
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* resume_map_numa_kva - add KVA mapping to the temporary page tables created
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* during resume from hibernation
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* @pgd_base - temporary resume page directory
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*/
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void resume_map_numa_kva(pgd_t *pgd_base)
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{
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int node;
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for_each_online_node(node) {
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unsigned long start_va, start_pfn, nr_pages, pfn;
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start_va = (unsigned long)node_remap_start_vaddr[node];
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start_pfn = node_remap_start_pfn[node];
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nr_pages = (node_remap_end_vaddr[node] -
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node_remap_start_vaddr[node]) >> PAGE_SHIFT;
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printk(KERN_DEBUG "%s: node %d\n", __func__, node);
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for (pfn = 0; pfn < nr_pages; pfn += PTRS_PER_PTE) {
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unsigned long vaddr = start_va + (pfn << PAGE_SHIFT);
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pgd_t *pgd = pgd_base + pgd_index(vaddr);
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pud_t *pud = pud_offset(pgd, vaddr);
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pmd_t *pmd = pmd_offset(pud, vaddr);
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set_pmd(pmd, pfn_pmd(start_pfn + pfn,
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PAGE_KERNEL_LARGE_EXEC));
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printk(KERN_DEBUG "%s: %08lx -> pfn %08lx\n",
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__func__, vaddr, start_pfn + pfn);
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}
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}
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}
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#endif
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/**
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* init_alloc_remap - Initialize remap allocator for a NUMA node
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* @nid: NUMA node to initizlie remap allocator for
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*
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* NUMA nodes may end up without any lowmem. As allocating pgdat and
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* memmap on a different node with lowmem is inefficient, a special
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* remap allocator is implemented which can be used by alloc_remap().
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*
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* For each node, the amount of memory which will be necessary for
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* pgdat and memmap is calculated and two memory areas of the size are
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* allocated - one in the node and the other in lowmem; then, the area
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* in the node is remapped to the lowmem area.
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*
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* As pgdat and memmap must be allocated in lowmem anyway, this
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* doesn't waste lowmem address space; however, the actual lowmem
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* which gets remapped over is wasted. The amount shouldn't be
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* problematic on machines this feature will be used.
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*
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* Initialization failure isn't fatal. alloc_remap() is used
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* opportunistically and the callers will fall back to other memory
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* allocation mechanisms on failure.
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*/
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void __init init_alloc_remap(int nid, u64 start, u64 end)
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{
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unsigned long start_pfn = start >> PAGE_SHIFT;
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unsigned long end_pfn = end >> PAGE_SHIFT;
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unsigned long size, pfn;
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u64 node_pa, remap_pa;
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void *remap_va;
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/*
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* The acpi/srat node info can show hot-add memroy zones where
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* memory could be added but not currently present.
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*/
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printk(KERN_DEBUG "node %d pfn: [%lx - %lx]\n",
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nid, start_pfn, end_pfn);
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/* calculate the necessary space aligned to large page size */
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size = node_memmap_size_bytes(nid, start_pfn, end_pfn);
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size += ALIGN(sizeof(pg_data_t), PAGE_SIZE);
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size = ALIGN(size, LARGE_PAGE_BYTES);
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/* allocate node memory and the lowmem remap area */
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node_pa = memblock_find_in_range(start, end, size, LARGE_PAGE_BYTES);
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if (!node_pa) {
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pr_warning("remap_alloc: failed to allocate %lu bytes for node %d\n",
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size, nid);
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return;
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}
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memblock_reserve(node_pa, size);
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remap_pa = memblock_find_in_range(min_low_pfn << PAGE_SHIFT,
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max_low_pfn << PAGE_SHIFT,
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size, LARGE_PAGE_BYTES);
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if (!remap_pa) {
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pr_warning("remap_alloc: failed to allocate %lu bytes remap area for node %d\n",
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size, nid);
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memblock_free(node_pa, size);
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return;
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}
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memblock_reserve(remap_pa, size);
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remap_va = phys_to_virt(remap_pa);
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/* perform actual remap */
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for (pfn = 0; pfn < size >> PAGE_SHIFT; pfn += PTRS_PER_PTE)
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set_pmd_pfn((unsigned long)remap_va + (pfn << PAGE_SHIFT),
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(node_pa >> PAGE_SHIFT) + pfn,
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PAGE_KERNEL_LARGE);
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/* initialize remap allocator parameters */
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node_remap_start_pfn[nid] = node_pa >> PAGE_SHIFT;
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node_remap_start_vaddr[nid] = remap_va;
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node_remap_end_vaddr[nid] = remap_va + size;
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node_remap_alloc_vaddr[nid] = remap_va;
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printk(KERN_DEBUG "remap_alloc: node %d [%08llx-%08llx) -> [%p-%p)\n",
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nid, node_pa, node_pa + size, remap_va, remap_va + size);
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}
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void __init initmem_init(void)
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{
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x86_numa_init();
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#ifdef CONFIG_HIGHMEM
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highstart_pfn = highend_pfn = max_pfn;
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if (max_pfn > max_low_pfn)
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highstart_pfn = max_low_pfn;
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printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
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pages_to_mb(highend_pfn - highstart_pfn));
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num_physpages = highend_pfn;
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high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
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#else
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num_physpages = max_low_pfn;
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high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
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#endif
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printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
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pages_to_mb(max_low_pfn));
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printk(KERN_DEBUG "max_low_pfn = %lx, highstart_pfn = %lx\n",
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max_low_pfn, highstart_pfn);
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printk(KERN_DEBUG "Low memory ends at vaddr %08lx\n",
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(ulong) pfn_to_kaddr(max_low_pfn));
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printk(KERN_DEBUG "High memory starts at vaddr %08lx\n",
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(ulong) pfn_to_kaddr(highstart_pfn));
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setup_bootmem_allocator();
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}
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