Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1 | /* |
| 2 | * PowerPC version |
| 3 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) |
| 4 | * |
| 5 | * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au) |
| 6 | * and Cort Dougan (PReP) (cort@cs.nmt.edu) |
| 7 | * Copyright (C) 1996 Paul Mackerras |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 8 | * |
| 9 | * Derived from "arch/i386/mm/init.c" |
| 10 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds |
| 11 | * |
| 12 | * Dave Engebretsen <engebret@us.ibm.com> |
| 13 | * Rework for PPC64 port. |
| 14 | * |
| 15 | * This program is free software; you can redistribute it and/or |
| 16 | * modify it under the terms of the GNU General Public License |
| 17 | * as published by the Free Software Foundation; either version |
| 18 | * 2 of the License, or (at your option) any later version. |
| 19 | * |
| 20 | */ |
| 21 | |
Benjamin Herrenschmidt | cec08e7 | 2008-04-30 15:41:48 +1000 | [diff] [blame] | 22 | #undef DEBUG |
| 23 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 24 | #include <linux/signal.h> |
| 25 | #include <linux/sched.h> |
| 26 | #include <linux/kernel.h> |
| 27 | #include <linux/errno.h> |
| 28 | #include <linux/string.h> |
| 29 | #include <linux/types.h> |
| 30 | #include <linux/mman.h> |
| 31 | #include <linux/mm.h> |
| 32 | #include <linux/swap.h> |
| 33 | #include <linux/stddef.h> |
| 34 | #include <linux/vmalloc.h> |
| 35 | #include <linux/init.h> |
| 36 | #include <linux/delay.h> |
| 37 | #include <linux/bootmem.h> |
| 38 | #include <linux/highmem.h> |
| 39 | #include <linux/idr.h> |
| 40 | #include <linux/nodemask.h> |
| 41 | #include <linux/module.h> |
Randy Dunlap | c9cf552 | 2006-06-27 02:53:52 -0700 | [diff] [blame] | 42 | #include <linux/poison.h> |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 43 | #include <linux/memblock.h> |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 44 | #include <linux/hugetlb.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 45 | #include <linux/slab.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 46 | |
| 47 | #include <asm/pgalloc.h> |
| 48 | #include <asm/page.h> |
| 49 | #include <asm/prom.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 50 | #include <asm/rtas.h> |
| 51 | #include <asm/io.h> |
| 52 | #include <asm/mmu_context.h> |
| 53 | #include <asm/pgtable.h> |
| 54 | #include <asm/mmu.h> |
| 55 | #include <asm/uaccess.h> |
| 56 | #include <asm/smp.h> |
| 57 | #include <asm/machdep.h> |
| 58 | #include <asm/tlb.h> |
| 59 | #include <asm/eeh.h> |
| 60 | #include <asm/processor.h> |
| 61 | #include <asm/mmzone.h> |
| 62 | #include <asm/cputable.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 63 | #include <asm/sections.h> |
| 64 | #include <asm/system.h> |
| 65 | #include <asm/iommu.h> |
| 66 | #include <asm/abs_addr.h> |
| 67 | #include <asm/vdso.h> |
David Gibson | 800fc3e | 2005-11-16 15:43:48 +1100 | [diff] [blame] | 68 | |
| 69 | #include "mmu_decl.h" |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 70 | |
Benjamin Herrenschmidt | 9449168 | 2009-06-02 21:17:45 +0000 | [diff] [blame] | 71 | #ifdef CONFIG_PPC_STD_MMU_64 |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 72 | #if PGTABLE_RANGE > USER_VSID_RANGE |
| 73 | #warning Limited user VSID range means pagetable space is wasted |
| 74 | #endif |
| 75 | |
| 76 | #if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE) |
| 77 | #warning TASK_SIZE is smaller than it needs to be. |
| 78 | #endif |
Benjamin Herrenschmidt | 9449168 | 2009-06-02 21:17:45 +0000 | [diff] [blame] | 79 | #endif /* CONFIG_PPC_STD_MMU_64 */ |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 80 | |
Kumar Gala | 37dd2ba | 2008-04-22 04:22:34 +1000 | [diff] [blame] | 81 | phys_addr_t memstart_addr = ~0; |
Sonny Rao | 79c3095 | 2010-08-19 18:08:09 +0000 | [diff] [blame] | 82 | EXPORT_SYMBOL_GPL(memstart_addr); |
Kumar Gala | 37dd2ba | 2008-04-22 04:22:34 +1000 | [diff] [blame] | 83 | phys_addr_t kernstart_addr; |
Sonny Rao | 79c3095 | 2010-08-19 18:08:09 +0000 | [diff] [blame] | 84 | EXPORT_SYMBOL_GPL(kernstart_addr); |
Kumar Gala | d7917ba | 2008-04-16 05:52:22 +1000 | [diff] [blame] | 85 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 86 | static void pgd_ctor(void *addr) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 87 | { |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 88 | memset(addr, 0, PGD_TABLE_SIZE); |
| 89 | } |
| 90 | |
| 91 | static void pmd_ctor(void *addr) |
| 92 | { |
| 93 | memset(addr, 0, PMD_TABLE_SIZE); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 94 | } |
| 95 | |
David Gibson | a0668cd | 2009-10-28 16:27:18 +0000 | [diff] [blame] | 96 | struct kmem_cache *pgtable_cache[MAX_PGTABLE_INDEX_SIZE]; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 97 | |
David Gibson | a0668cd | 2009-10-28 16:27:18 +0000 | [diff] [blame] | 98 | /* |
| 99 | * Create a kmem_cache() for pagetables. This is not used for PTE |
| 100 | * pages - they're linked to struct page, come from the normal free |
| 101 | * pages pool and have a different entry size (see real_pte_t) to |
| 102 | * everything else. Caches created by this function are used for all |
| 103 | * the higher level pagetables, and for hugepage pagetables. |
| 104 | */ |
| 105 | void pgtable_cache_add(unsigned shift, void (*ctor)(void *)) |
| 106 | { |
| 107 | char *name; |
| 108 | unsigned long table_size = sizeof(void *) << shift; |
| 109 | unsigned long align = table_size; |
| 110 | |
| 111 | /* When batching pgtable pointers for RCU freeing, we store |
| 112 | * the index size in the low bits. Table alignment must be |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 113 | * big enough to fit it. |
| 114 | * |
| 115 | * Likewise, hugeapge pagetable pointers contain a (different) |
| 116 | * shift value in the low bits. All tables must be aligned so |
| 117 | * as to leave enough 0 bits in the address to contain it. */ |
| 118 | unsigned long minalign = max(MAX_PGTABLE_INDEX_SIZE + 1, |
| 119 | HUGEPD_SHIFT_MASK + 1); |
David Gibson | a0668cd | 2009-10-28 16:27:18 +0000 | [diff] [blame] | 120 | struct kmem_cache *new; |
| 121 | |
| 122 | /* It would be nice if this was a BUILD_BUG_ON(), but at the |
| 123 | * moment, gcc doesn't seem to recognize is_power_of_2 as a |
| 124 | * constant expression, so so much for that. */ |
| 125 | BUG_ON(!is_power_of_2(minalign)); |
| 126 | BUG_ON((shift < 1) || (shift > MAX_PGTABLE_INDEX_SIZE)); |
| 127 | |
| 128 | if (PGT_CACHE(shift)) |
| 129 | return; /* Already have a cache of this size */ |
| 130 | |
| 131 | align = max_t(unsigned long, align, minalign); |
| 132 | name = kasprintf(GFP_KERNEL, "pgtable-2^%d", shift); |
| 133 | new = kmem_cache_create(name, table_size, align, 0, ctor); |
| 134 | PGT_CACHE(shift) = new; |
| 135 | |
| 136 | pr_debug("Allocated pgtable cache for order %d\n", shift); |
| 137 | } |
| 138 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 139 | |
| 140 | void pgtable_cache_init(void) |
| 141 | { |
David Gibson | a0668cd | 2009-10-28 16:27:18 +0000 | [diff] [blame] | 142 | pgtable_cache_add(PGD_INDEX_SIZE, pgd_ctor); |
| 143 | pgtable_cache_add(PMD_INDEX_SIZE, pmd_ctor); |
| 144 | if (!PGT_CACHE(PGD_INDEX_SIZE) || !PGT_CACHE(PMD_INDEX_SIZE)) |
| 145 | panic("Couldn't allocate pgtable caches"); |
| 146 | |
| 147 | /* In all current configs, when the PUD index exists it's the |
| 148 | * same size as either the pgd or pmd index. Verify that the |
| 149 | * initialization above has also created a PUD cache. This |
| 150 | * will need re-examiniation if we add new possibilities for |
| 151 | * the pagetable layout. */ |
| 152 | BUG_ON(PUD_INDEX_SIZE && !PGT_CACHE(PUD_INDEX_SIZE)); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 153 | } |
Andy Whitcroft | d29eff7 | 2007-10-16 01:24:17 -0700 | [diff] [blame] | 154 | |
| 155 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
| 156 | /* |
| 157 | * Given an address within the vmemmap, determine the pfn of the page that |
| 158 | * represents the start of the section it is within. Note that we have to |
| 159 | * do this by hand as the proffered address may not be correctly aligned. |
| 160 | * Subtraction of non-aligned pointers produces undefined results. |
| 161 | */ |
Michael Ellerman | 09de9ff | 2008-05-08 14:27:07 +1000 | [diff] [blame] | 162 | static unsigned long __meminit vmemmap_section_start(unsigned long page) |
Andy Whitcroft | d29eff7 | 2007-10-16 01:24:17 -0700 | [diff] [blame] | 163 | { |
| 164 | unsigned long offset = page - ((unsigned long)(vmemmap)); |
| 165 | |
| 166 | /* Return the pfn of the start of the section. */ |
| 167 | return (offset / sizeof(struct page)) & PAGE_SECTION_MASK; |
| 168 | } |
| 169 | |
| 170 | /* |
| 171 | * Check if this vmemmap page is already initialised. If any section |
| 172 | * which overlaps this vmemmap page is initialised then this page is |
| 173 | * initialised already. |
| 174 | */ |
Michael Ellerman | 09de9ff | 2008-05-08 14:27:07 +1000 | [diff] [blame] | 175 | static int __meminit vmemmap_populated(unsigned long start, int page_size) |
Andy Whitcroft | d29eff7 | 2007-10-16 01:24:17 -0700 | [diff] [blame] | 176 | { |
| 177 | unsigned long end = start + page_size; |
| 178 | |
| 179 | for (; start < end; start += (PAGES_PER_SECTION * sizeof(struct page))) |
| 180 | if (pfn_valid(vmemmap_section_start(start))) |
| 181 | return 1; |
| 182 | |
| 183 | return 0; |
| 184 | } |
| 185 | |
Benjamin Herrenschmidt | 32a7494 | 2009-07-23 23:15:58 +0000 | [diff] [blame] | 186 | /* On hash-based CPUs, the vmemmap is bolted in the hash table. |
| 187 | * |
| 188 | * On Book3E CPUs, the vmemmap is currently mapped in the top half of |
| 189 | * the vmalloc space using normal page tables, though the size of |
| 190 | * pages encoded in the PTEs can be different |
| 191 | */ |
| 192 | |
| 193 | #ifdef CONFIG_PPC_BOOK3E |
| 194 | static void __meminit vmemmap_create_mapping(unsigned long start, |
| 195 | unsigned long page_size, |
| 196 | unsigned long phys) |
| 197 | { |
| 198 | /* Create a PTE encoding without page size */ |
| 199 | unsigned long i, flags = _PAGE_PRESENT | _PAGE_ACCESSED | |
| 200 | _PAGE_KERNEL_RW; |
| 201 | |
| 202 | /* PTEs only contain page size encodings up to 32M */ |
| 203 | BUG_ON(mmu_psize_defs[mmu_vmemmap_psize].enc > 0xf); |
| 204 | |
| 205 | /* Encode the size in the PTE */ |
| 206 | flags |= mmu_psize_defs[mmu_vmemmap_psize].enc << 8; |
| 207 | |
| 208 | /* For each PTE for that area, map things. Note that we don't |
| 209 | * increment phys because all PTEs are of the large size and |
| 210 | * thus must have the low bits clear |
| 211 | */ |
| 212 | for (i = 0; i < page_size; i += PAGE_SIZE) |
| 213 | BUG_ON(map_kernel_page(start + i, phys, flags)); |
| 214 | } |
| 215 | #else /* CONFIG_PPC_BOOK3E */ |
| 216 | static void __meminit vmemmap_create_mapping(unsigned long start, |
| 217 | unsigned long page_size, |
| 218 | unsigned long phys) |
| 219 | { |
| 220 | int mapped = htab_bolt_mapping(start, start + page_size, phys, |
| 221 | PAGE_KERNEL, mmu_vmemmap_psize, |
| 222 | mmu_kernel_ssize); |
| 223 | BUG_ON(mapped < 0); |
| 224 | } |
| 225 | #endif /* CONFIG_PPC_BOOK3E */ |
| 226 | |
Mark Nelson | 91eea67 | 2010-04-21 16:21:03 +0000 | [diff] [blame] | 227 | struct vmemmap_backing *vmemmap_list; |
| 228 | |
| 229 | static __meminit struct vmemmap_backing * vmemmap_list_alloc(int node) |
| 230 | { |
| 231 | static struct vmemmap_backing *next; |
| 232 | static int num_left; |
| 233 | |
| 234 | /* allocate a page when required and hand out chunks */ |
| 235 | if (!next || !num_left) { |
| 236 | next = vmemmap_alloc_block(PAGE_SIZE, node); |
| 237 | if (unlikely(!next)) { |
| 238 | WARN_ON(1); |
| 239 | return NULL; |
| 240 | } |
| 241 | num_left = PAGE_SIZE / sizeof(struct vmemmap_backing); |
| 242 | } |
| 243 | |
| 244 | num_left--; |
| 245 | |
| 246 | return next++; |
| 247 | } |
| 248 | |
| 249 | static __meminit void vmemmap_list_populate(unsigned long phys, |
| 250 | unsigned long start, |
| 251 | int node) |
| 252 | { |
| 253 | struct vmemmap_backing *vmem_back; |
| 254 | |
| 255 | vmem_back = vmemmap_list_alloc(node); |
| 256 | if (unlikely(!vmem_back)) { |
| 257 | WARN_ON(1); |
| 258 | return; |
| 259 | } |
| 260 | |
| 261 | vmem_back->phys = phys; |
| 262 | vmem_back->virt_addr = start; |
| 263 | vmem_back->list = vmemmap_list; |
| 264 | |
| 265 | vmemmap_list = vmem_back; |
| 266 | } |
| 267 | |
Andy Whitcroft | d29eff7 | 2007-10-16 01:24:17 -0700 | [diff] [blame] | 268 | int __meminit vmemmap_populate(struct page *start_page, |
Benjamin Herrenschmidt | cec08e7 | 2008-04-30 15:41:48 +1000 | [diff] [blame] | 269 | unsigned long nr_pages, int node) |
Andy Whitcroft | d29eff7 | 2007-10-16 01:24:17 -0700 | [diff] [blame] | 270 | { |
Andy Whitcroft | d29eff7 | 2007-10-16 01:24:17 -0700 | [diff] [blame] | 271 | unsigned long start = (unsigned long)start_page; |
| 272 | unsigned long end = (unsigned long)(start_page + nr_pages); |
Benjamin Herrenschmidt | cec08e7 | 2008-04-30 15:41:48 +1000 | [diff] [blame] | 273 | unsigned long page_size = 1 << mmu_psize_defs[mmu_vmemmap_psize].shift; |
Andy Whitcroft | d29eff7 | 2007-10-16 01:24:17 -0700 | [diff] [blame] | 274 | |
Andy Whitcroft | d29eff7 | 2007-10-16 01:24:17 -0700 | [diff] [blame] | 275 | /* Align to the page size of the linear mapping. */ |
| 276 | start = _ALIGN_DOWN(start, page_size); |
| 277 | |
Benjamin Herrenschmidt | 32a7494 | 2009-07-23 23:15:58 +0000 | [diff] [blame] | 278 | pr_debug("vmemmap_populate page %p, %ld pages, node %d\n", |
| 279 | start_page, nr_pages, node); |
| 280 | pr_debug(" -> map %lx..%lx\n", start, end); |
| 281 | |
Andy Whitcroft | d29eff7 | 2007-10-16 01:24:17 -0700 | [diff] [blame] | 282 | for (; start < end; start += page_size) { |
Andy Whitcroft | d29eff7 | 2007-10-16 01:24:17 -0700 | [diff] [blame] | 283 | void *p; |
| 284 | |
| 285 | if (vmemmap_populated(start, page_size)) |
| 286 | continue; |
| 287 | |
| 288 | p = vmemmap_alloc_block(page_size, node); |
| 289 | if (!p) |
| 290 | return -ENOMEM; |
| 291 | |
Mark Nelson | 91eea67 | 2010-04-21 16:21:03 +0000 | [diff] [blame] | 292 | vmemmap_list_populate(__pa(p), start, node); |
| 293 | |
Benjamin Herrenschmidt | 32a7494 | 2009-07-23 23:15:58 +0000 | [diff] [blame] | 294 | pr_debug(" * %016lx..%016lx allocated at %p\n", |
| 295 | start, start + page_size, p); |
Andy Whitcroft | d29eff7 | 2007-10-16 01:24:17 -0700 | [diff] [blame] | 296 | |
Benjamin Herrenschmidt | 32a7494 | 2009-07-23 23:15:58 +0000 | [diff] [blame] | 297 | vmemmap_create_mapping(start, page_size, __pa(p)); |
Andy Whitcroft | d29eff7 | 2007-10-16 01:24:17 -0700 | [diff] [blame] | 298 | } |
| 299 | |
| 300 | return 0; |
| 301 | } |
Benjamin Herrenschmidt | cec08e7 | 2008-04-30 15:41:48 +1000 | [diff] [blame] | 302 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
Benjamin Herrenschmidt | cd3db0c | 2010-07-06 15:39:02 -0700 | [diff] [blame] | 303 | |