Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 1 | /* |
| 2 | * sparse memory mappings. |
| 3 | */ |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 4 | #include <linux/mm.h> |
| 5 | #include <linux/mmzone.h> |
| 6 | #include <linux/bootmem.h> |
Dave Hansen | 0b0acbe | 2005-10-29 18:16:55 -0700 | [diff] [blame] | 7 | #include <linux/highmem.h> |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 8 | #include <linux/module.h> |
Dave Hansen | 28ae55c | 2005-09-03 15:54:29 -0700 | [diff] [blame] | 9 | #include <linux/spinlock.h> |
Dave Hansen | 0b0acbe | 2005-10-29 18:16:55 -0700 | [diff] [blame] | 10 | #include <linux/vmalloc.h> |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 11 | #include <asm/dma.h> |
Christoph Lameter | 8f6aac4 | 2007-10-16 01:24:13 -0700 | [diff] [blame] | 12 | #include <asm/pgalloc.h> |
| 13 | #include <asm/pgtable.h> |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 14 | |
| 15 | /* |
| 16 | * Permanent SPARSEMEM data: |
| 17 | * |
| 18 | * 1) mem_section - memory sections, mem_map's for valid memory |
| 19 | */ |
Bob Picco | 3e34726 | 2005-09-03 15:54:28 -0700 | [diff] [blame] | 20 | #ifdef CONFIG_SPARSEMEM_EXTREME |
Bob Picco | 802f192 | 2005-09-03 15:54:26 -0700 | [diff] [blame] | 21 | struct mem_section *mem_section[NR_SECTION_ROOTS] |
Ravikiran G Thirumalai | 22fc6ec | 2006-01-08 01:01:27 -0800 | [diff] [blame] | 22 | ____cacheline_internodealigned_in_smp; |
Bob Picco | 3e34726 | 2005-09-03 15:54:28 -0700 | [diff] [blame] | 23 | #else |
| 24 | struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT] |
Ravikiran G Thirumalai | 22fc6ec | 2006-01-08 01:01:27 -0800 | [diff] [blame] | 25 | ____cacheline_internodealigned_in_smp; |
Bob Picco | 3e34726 | 2005-09-03 15:54:28 -0700 | [diff] [blame] | 26 | #endif |
| 27 | EXPORT_SYMBOL(mem_section); |
| 28 | |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 29 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
| 30 | /* |
| 31 | * If we did not store the node number in the page then we have to |
| 32 | * do a lookup in the section_to_node_table in order to find which |
| 33 | * node the page belongs to. |
| 34 | */ |
| 35 | #if MAX_NUMNODES <= 256 |
| 36 | static u8 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned; |
| 37 | #else |
| 38 | static u16 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned; |
| 39 | #endif |
| 40 | |
Andy Whitcroft | 25ba77c | 2006-12-06 20:33:03 -0800 | [diff] [blame] | 41 | int page_to_nid(struct page *page) |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 42 | { |
| 43 | return section_to_node_table[page_to_section(page)]; |
| 44 | } |
| 45 | EXPORT_SYMBOL(page_to_nid); |
Andy Whitcroft | 85770ff | 2007-08-22 14:01:03 -0700 | [diff] [blame] | 46 | |
| 47 | static void set_section_nid(unsigned long section_nr, int nid) |
| 48 | { |
| 49 | section_to_node_table[section_nr] = nid; |
| 50 | } |
| 51 | #else /* !NODE_NOT_IN_PAGE_FLAGS */ |
| 52 | static inline void set_section_nid(unsigned long section_nr, int nid) |
| 53 | { |
| 54 | } |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 55 | #endif |
| 56 | |
Bob Picco | 3e34726 | 2005-09-03 15:54:28 -0700 | [diff] [blame] | 57 | #ifdef CONFIG_SPARSEMEM_EXTREME |
Sam Ravnborg | 577a32f | 2007-05-17 23:29:25 +0200 | [diff] [blame] | 58 | static struct mem_section noinline __init_refok *sparse_index_alloc(int nid) |
Bob Picco | 802f192 | 2005-09-03 15:54:26 -0700 | [diff] [blame] | 59 | { |
Dave Hansen | 28ae55c | 2005-09-03 15:54:29 -0700 | [diff] [blame] | 60 | struct mem_section *section = NULL; |
| 61 | unsigned long array_size = SECTIONS_PER_ROOT * |
| 62 | sizeof(struct mem_section); |
Bob Picco | 802f192 | 2005-09-03 15:54:26 -0700 | [diff] [blame] | 63 | |
Mike Kravetz | 39d24e6 | 2006-05-15 09:44:13 -0700 | [diff] [blame] | 64 | if (slab_is_available()) |
Mike Kravetz | 46a66ee | 2006-05-01 12:16:09 -0700 | [diff] [blame] | 65 | section = kmalloc_node(array_size, GFP_KERNEL, nid); |
| 66 | else |
| 67 | section = alloc_bootmem_node(NODE_DATA(nid), array_size); |
Bob Picco | 3e34726 | 2005-09-03 15:54:28 -0700 | [diff] [blame] | 68 | |
Dave Hansen | 28ae55c | 2005-09-03 15:54:29 -0700 | [diff] [blame] | 69 | if (section) |
| 70 | memset(section, 0, array_size); |
Bob Picco | 3e34726 | 2005-09-03 15:54:28 -0700 | [diff] [blame] | 71 | |
Dave Hansen | 28ae55c | 2005-09-03 15:54:29 -0700 | [diff] [blame] | 72 | return section; |
Bob Picco | 802f192 | 2005-09-03 15:54:26 -0700 | [diff] [blame] | 73 | } |
Dave Hansen | 28ae55c | 2005-09-03 15:54:29 -0700 | [diff] [blame] | 74 | |
Yasunori Goto | a3142c8 | 2007-05-08 00:23:07 -0700 | [diff] [blame] | 75 | static int __meminit sparse_index_init(unsigned long section_nr, int nid) |
Dave Hansen | 28ae55c | 2005-09-03 15:54:29 -0700 | [diff] [blame] | 76 | { |
Ingo Molnar | 34af946 | 2006-06-27 02:53:55 -0700 | [diff] [blame] | 77 | static DEFINE_SPINLOCK(index_init_lock); |
Dave Hansen | 28ae55c | 2005-09-03 15:54:29 -0700 | [diff] [blame] | 78 | unsigned long root = SECTION_NR_TO_ROOT(section_nr); |
| 79 | struct mem_section *section; |
| 80 | int ret = 0; |
| 81 | |
| 82 | if (mem_section[root]) |
| 83 | return -EEXIST; |
| 84 | |
| 85 | section = sparse_index_alloc(nid); |
WANG Cong | af0cd5a | 2007-12-17 16:19:58 -0800 | [diff] [blame] | 86 | if (!section) |
| 87 | return -ENOMEM; |
Dave Hansen | 28ae55c | 2005-09-03 15:54:29 -0700 | [diff] [blame] | 88 | /* |
| 89 | * This lock keeps two different sections from |
| 90 | * reallocating for the same index |
| 91 | */ |
| 92 | spin_lock(&index_init_lock); |
| 93 | |
| 94 | if (mem_section[root]) { |
| 95 | ret = -EEXIST; |
| 96 | goto out; |
| 97 | } |
| 98 | |
| 99 | mem_section[root] = section; |
| 100 | out: |
| 101 | spin_unlock(&index_init_lock); |
| 102 | return ret; |
| 103 | } |
| 104 | #else /* !SPARSEMEM_EXTREME */ |
| 105 | static inline int sparse_index_init(unsigned long section_nr, int nid) |
| 106 | { |
| 107 | return 0; |
| 108 | } |
| 109 | #endif |
| 110 | |
Dave Hansen | 4ca644d | 2005-10-29 18:16:51 -0700 | [diff] [blame] | 111 | /* |
| 112 | * Although written for the SPARSEMEM_EXTREME case, this happens |
Andy Whitcroft | cd881a6 | 2007-10-16 01:24:10 -0700 | [diff] [blame] | 113 | * to also work for the flat array case because |
Dave Hansen | 4ca644d | 2005-10-29 18:16:51 -0700 | [diff] [blame] | 114 | * NR_SECTION_ROOTS==NR_MEM_SECTIONS. |
| 115 | */ |
| 116 | int __section_nr(struct mem_section* ms) |
| 117 | { |
| 118 | unsigned long root_nr; |
| 119 | struct mem_section* root; |
| 120 | |
Mike Kravetz | 12783b0 | 2006-05-20 15:00:05 -0700 | [diff] [blame] | 121 | for (root_nr = 0; root_nr < NR_SECTION_ROOTS; root_nr++) { |
| 122 | root = __nr_to_section(root_nr * SECTIONS_PER_ROOT); |
Dave Hansen | 4ca644d | 2005-10-29 18:16:51 -0700 | [diff] [blame] | 123 | if (!root) |
| 124 | continue; |
| 125 | |
| 126 | if ((ms >= root) && (ms < (root + SECTIONS_PER_ROOT))) |
| 127 | break; |
| 128 | } |
| 129 | |
| 130 | return (root_nr * SECTIONS_PER_ROOT) + (ms - root); |
| 131 | } |
| 132 | |
Andy Whitcroft | 30c253e | 2006-06-23 02:03:41 -0700 | [diff] [blame] | 133 | /* |
| 134 | * During early boot, before section_mem_map is used for an actual |
| 135 | * mem_map, we use section_mem_map to store the section's NUMA |
| 136 | * node. This keeps us from having to use another data structure. The |
| 137 | * node information is cleared just before we store the real mem_map. |
| 138 | */ |
| 139 | static inline unsigned long sparse_encode_early_nid(int nid) |
| 140 | { |
| 141 | return (nid << SECTION_NID_SHIFT); |
| 142 | } |
| 143 | |
| 144 | static inline int sparse_early_nid(struct mem_section *section) |
| 145 | { |
| 146 | return (section->section_mem_map >> SECTION_NID_SHIFT); |
| 147 | } |
| 148 | |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 149 | /* Record a memory area against a node. */ |
Yasunori Goto | a3142c8 | 2007-05-08 00:23:07 -0700 | [diff] [blame] | 150 | void __init memory_present(int nid, unsigned long start, unsigned long end) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 151 | { |
Ingo Molnar | bead9a3 | 2008-04-16 01:40:00 +0200 | [diff] [blame] | 152 | unsigned long max_arch_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT); |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 153 | unsigned long pfn; |
| 154 | |
Ingo Molnar | bead9a3 | 2008-04-16 01:40:00 +0200 | [diff] [blame] | 155 | /* |
| 156 | * Sanity checks - do not allow an architecture to pass |
| 157 | * in larger pfns than the maximum scope of sparsemem: |
| 158 | */ |
| 159 | if (start >= max_arch_pfn) |
| 160 | return; |
| 161 | if (end >= max_arch_pfn) |
| 162 | end = max_arch_pfn; |
| 163 | |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 164 | start &= PAGE_SECTION_MASK; |
| 165 | for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) { |
| 166 | unsigned long section = pfn_to_section_nr(pfn); |
Bob Picco | 802f192 | 2005-09-03 15:54:26 -0700 | [diff] [blame] | 167 | struct mem_section *ms; |
| 168 | |
| 169 | sparse_index_init(section, nid); |
Andy Whitcroft | 85770ff | 2007-08-22 14:01:03 -0700 | [diff] [blame] | 170 | set_section_nid(section, nid); |
Bob Picco | 802f192 | 2005-09-03 15:54:26 -0700 | [diff] [blame] | 171 | |
| 172 | ms = __nr_to_section(section); |
| 173 | if (!ms->section_mem_map) |
Andy Whitcroft | 30c253e | 2006-06-23 02:03:41 -0700 | [diff] [blame] | 174 | ms->section_mem_map = sparse_encode_early_nid(nid) | |
| 175 | SECTION_MARKED_PRESENT; |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 176 | } |
| 177 | } |
| 178 | |
| 179 | /* |
| 180 | * Only used by the i386 NUMA architecures, but relatively |
| 181 | * generic code. |
| 182 | */ |
| 183 | unsigned long __init node_memmap_size_bytes(int nid, unsigned long start_pfn, |
| 184 | unsigned long end_pfn) |
| 185 | { |
| 186 | unsigned long pfn; |
| 187 | unsigned long nr_pages = 0; |
| 188 | |
| 189 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { |
| 190 | if (nid != early_pfn_to_nid(pfn)) |
| 191 | continue; |
| 192 | |
Andy Whitcroft | 540557b | 2007-10-16 01:24:11 -0700 | [diff] [blame] | 193 | if (pfn_present(pfn)) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 194 | nr_pages += PAGES_PER_SECTION; |
| 195 | } |
| 196 | |
| 197 | return nr_pages * sizeof(struct page); |
| 198 | } |
| 199 | |
| 200 | /* |
Andy Whitcroft | 29751f6 | 2005-06-23 00:08:00 -0700 | [diff] [blame] | 201 | * Subtle, we encode the real pfn into the mem_map such that |
| 202 | * the identity pfn - section_mem_map will return the actual |
| 203 | * physical page frame number. |
| 204 | */ |
| 205 | static unsigned long sparse_encode_mem_map(struct page *mem_map, unsigned long pnum) |
| 206 | { |
| 207 | return (unsigned long)(mem_map - (section_nr_to_pfn(pnum))); |
| 208 | } |
| 209 | |
| 210 | /* |
Badari Pulavarty | ea01ea9 | 2008-04-28 02:12:01 -0700 | [diff] [blame] | 211 | * Decode mem_map from the coded memmap |
Andy Whitcroft | 29751f6 | 2005-06-23 00:08:00 -0700 | [diff] [blame] | 212 | */ |
Badari Pulavarty | ea01ea9 | 2008-04-28 02:12:01 -0700 | [diff] [blame] | 213 | static |
Andy Whitcroft | 29751f6 | 2005-06-23 00:08:00 -0700 | [diff] [blame] | 214 | struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pnum) |
| 215 | { |
Badari Pulavarty | ea01ea9 | 2008-04-28 02:12:01 -0700 | [diff] [blame] | 216 | /* mask off the extra low bits of information */ |
| 217 | coded_mem_map &= SECTION_MAP_MASK; |
Andy Whitcroft | 29751f6 | 2005-06-23 00:08:00 -0700 | [diff] [blame] | 218 | return ((struct page *)coded_mem_map) + section_nr_to_pfn(pnum); |
| 219 | } |
| 220 | |
Yasunori Goto | a3142c8 | 2007-05-08 00:23:07 -0700 | [diff] [blame] | 221 | static int __meminit sparse_init_one_section(struct mem_section *ms, |
Mel Gorman | 5c0e306 | 2007-10-16 01:25:56 -0700 | [diff] [blame] | 222 | unsigned long pnum, struct page *mem_map, |
| 223 | unsigned long *pageblock_bitmap) |
Andy Whitcroft | 29751f6 | 2005-06-23 00:08:00 -0700 | [diff] [blame] | 224 | { |
Andy Whitcroft | 540557b | 2007-10-16 01:24:11 -0700 | [diff] [blame] | 225 | if (!present_section(ms)) |
Andy Whitcroft | 29751f6 | 2005-06-23 00:08:00 -0700 | [diff] [blame] | 226 | return -EINVAL; |
| 227 | |
Andy Whitcroft | 30c253e | 2006-06-23 02:03:41 -0700 | [diff] [blame] | 228 | ms->section_mem_map &= ~SECTION_MAP_MASK; |
Andy Whitcroft | 540557b | 2007-10-16 01:24:11 -0700 | [diff] [blame] | 229 | ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum) | |
| 230 | SECTION_HAS_MEM_MAP; |
Mel Gorman | 5c0e306 | 2007-10-16 01:25:56 -0700 | [diff] [blame] | 231 | ms->pageblock_flags = pageblock_bitmap; |
Andy Whitcroft | 29751f6 | 2005-06-23 00:08:00 -0700 | [diff] [blame] | 232 | |
| 233 | return 1; |
| 234 | } |
| 235 | |
Mel Gorman | 5c0e306 | 2007-10-16 01:25:56 -0700 | [diff] [blame] | 236 | static unsigned long usemap_size(void) |
| 237 | { |
| 238 | unsigned long size_bytes; |
| 239 | size_bytes = roundup(SECTION_BLOCKFLAGS_BITS, 8) / 8; |
| 240 | size_bytes = roundup(size_bytes, sizeof(unsigned long)); |
| 241 | return size_bytes; |
| 242 | } |
| 243 | |
| 244 | #ifdef CONFIG_MEMORY_HOTPLUG |
| 245 | static unsigned long *__kmalloc_section_usemap(void) |
| 246 | { |
| 247 | return kmalloc(usemap_size(), GFP_KERNEL); |
| 248 | } |
| 249 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
| 250 | |
Sam Ravnborg | a322f8a | 2008-02-04 22:29:35 -0800 | [diff] [blame] | 251 | static unsigned long *__init sparse_early_usemap_alloc(unsigned long pnum) |
Mel Gorman | 5c0e306 | 2007-10-16 01:25:56 -0700 | [diff] [blame] | 252 | { |
| 253 | unsigned long *usemap; |
| 254 | struct mem_section *ms = __nr_to_section(pnum); |
| 255 | int nid = sparse_early_nid(ms); |
| 256 | |
| 257 | usemap = alloc_bootmem_node(NODE_DATA(nid), usemap_size()); |
| 258 | if (usemap) |
| 259 | return usemap; |
| 260 | |
| 261 | /* Stupid: suppress gcc warning for SPARSEMEM && !NUMA */ |
| 262 | nid = 0; |
| 263 | |
| 264 | printk(KERN_WARNING "%s: allocation failed\n", __FUNCTION__); |
| 265 | return NULL; |
| 266 | } |
| 267 | |
Christoph Lameter | 8f6aac4 | 2007-10-16 01:24:13 -0700 | [diff] [blame] | 268 | #ifndef CONFIG_SPARSEMEM_VMEMMAP |
Yasunori Goto | 98f3cfc | 2007-10-16 01:26:14 -0700 | [diff] [blame] | 269 | struct page __init *sparse_mem_map_populate(unsigned long pnum, int nid) |
Andy Whitcroft | 29751f6 | 2005-06-23 00:08:00 -0700 | [diff] [blame] | 270 | { |
| 271 | struct page *map; |
Andy Whitcroft | 29751f6 | 2005-06-23 00:08:00 -0700 | [diff] [blame] | 272 | |
| 273 | map = alloc_remap(nid, sizeof(struct page) * PAGES_PER_SECTION); |
| 274 | if (map) |
| 275 | return map; |
| 276 | |
| 277 | map = alloc_bootmem_node(NODE_DATA(nid), |
| 278 | sizeof(struct page) * PAGES_PER_SECTION); |
Christoph Lameter | 8f6aac4 | 2007-10-16 01:24:13 -0700 | [diff] [blame] | 279 | return map; |
| 280 | } |
| 281 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ |
| 282 | |
| 283 | struct page __init *sparse_early_mem_map_alloc(unsigned long pnum) |
| 284 | { |
| 285 | struct page *map; |
| 286 | struct mem_section *ms = __nr_to_section(pnum); |
| 287 | int nid = sparse_early_nid(ms); |
| 288 | |
Yasunori Goto | 98f3cfc | 2007-10-16 01:26:14 -0700 | [diff] [blame] | 289 | map = sparse_mem_map_populate(pnum, nid); |
Andy Whitcroft | 29751f6 | 2005-06-23 00:08:00 -0700 | [diff] [blame] | 290 | if (map) |
| 291 | return map; |
| 292 | |
Christoph Lameter | 8f6aac4 | 2007-10-16 01:24:13 -0700 | [diff] [blame] | 293 | printk(KERN_ERR "%s: sparsemem memory map backing failed " |
| 294 | "some memory will not be available.\n", __FUNCTION__); |
Bob Picco | 802f192 | 2005-09-03 15:54:26 -0700 | [diff] [blame] | 295 | ms->section_mem_map = 0; |
Andy Whitcroft | 29751f6 | 2005-06-23 00:08:00 -0700 | [diff] [blame] | 296 | return NULL; |
| 297 | } |
| 298 | |
Yinghai Lu | c2b91e2 | 2008-04-12 01:19:24 -0700 | [diff] [blame] | 299 | void __attribute__((weak)) __meminit vmemmap_populate_print_last(void) |
| 300 | { |
| 301 | } |
Stephen Rothwell | 193faea | 2007-06-08 13:46:51 -0700 | [diff] [blame] | 302 | /* |
| 303 | * Allocate the accumulated non-linear sections, allocate a mem_map |
| 304 | * for each and record the physical to section mapping. |
| 305 | */ |
| 306 | void __init sparse_init(void) |
| 307 | { |
| 308 | unsigned long pnum; |
| 309 | struct page *map; |
Mel Gorman | 5c0e306 | 2007-10-16 01:25:56 -0700 | [diff] [blame] | 310 | unsigned long *usemap; |
Yinghai Lu | e123dd3 | 2008-04-13 11:51:06 -0700 | [diff] [blame] | 311 | unsigned long **usemap_map; |
| 312 | int size; |
| 313 | |
| 314 | /* |
| 315 | * map is using big page (aka 2M in x86 64 bit) |
| 316 | * usemap is less one page (aka 24 bytes) |
| 317 | * so alloc 2M (with 2M align) and 24 bytes in turn will |
| 318 | * make next 2M slip to one more 2M later. |
| 319 | * then in big system, the memory will have a lot of holes... |
| 320 | * here try to allocate 2M pages continously. |
| 321 | * |
| 322 | * powerpc need to call sparse_init_one_section right after each |
| 323 | * sparse_early_mem_map_alloc, so allocate usemap_map at first. |
| 324 | */ |
| 325 | size = sizeof(unsigned long *) * NR_MEM_SECTIONS; |
| 326 | usemap_map = alloc_bootmem(size); |
| 327 | if (!usemap_map) |
| 328 | panic("can not allocate usemap_map\n"); |
Stephen Rothwell | 193faea | 2007-06-08 13:46:51 -0700 | [diff] [blame] | 329 | |
| 330 | for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) { |
Andy Whitcroft | 540557b | 2007-10-16 01:24:11 -0700 | [diff] [blame] | 331 | if (!present_section_nr(pnum)) |
Stephen Rothwell | 193faea | 2007-06-08 13:46:51 -0700 | [diff] [blame] | 332 | continue; |
Yinghai Lu | e123dd3 | 2008-04-13 11:51:06 -0700 | [diff] [blame] | 333 | usemap_map[pnum] = sparse_early_usemap_alloc(pnum); |
| 334 | } |
| 335 | |
| 336 | for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) { |
| 337 | if (!present_section_nr(pnum)) |
| 338 | continue; |
| 339 | |
| 340 | usemap = usemap_map[pnum]; |
| 341 | if (!usemap) |
| 342 | continue; |
Stephen Rothwell | 193faea | 2007-06-08 13:46:51 -0700 | [diff] [blame] | 343 | |
| 344 | map = sparse_early_mem_map_alloc(pnum); |
| 345 | if (!map) |
| 346 | continue; |
Mel Gorman | 5c0e306 | 2007-10-16 01:25:56 -0700 | [diff] [blame] | 347 | |
Mel Gorman | 5c0e306 | 2007-10-16 01:25:56 -0700 | [diff] [blame] | 348 | sparse_init_one_section(__nr_to_section(pnum), pnum, map, |
| 349 | usemap); |
Stephen Rothwell | 193faea | 2007-06-08 13:46:51 -0700 | [diff] [blame] | 350 | } |
Yinghai Lu | e123dd3 | 2008-04-13 11:51:06 -0700 | [diff] [blame] | 351 | |
Yinghai Lu | c2b91e2 | 2008-04-12 01:19:24 -0700 | [diff] [blame] | 352 | vmemmap_populate_print_last(); |
| 353 | |
Yinghai Lu | e123dd3 | 2008-04-13 11:51:06 -0700 | [diff] [blame] | 354 | free_bootmem(__pa(usemap_map), size); |
Stephen Rothwell | 193faea | 2007-06-08 13:46:51 -0700 | [diff] [blame] | 355 | } |
| 356 | |
| 357 | #ifdef CONFIG_MEMORY_HOTPLUG |
Yasunori Goto | 98f3cfc | 2007-10-16 01:26:14 -0700 | [diff] [blame] | 358 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
| 359 | static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid, |
| 360 | unsigned long nr_pages) |
| 361 | { |
| 362 | /* This will make the necessary allocations eventually. */ |
| 363 | return sparse_mem_map_populate(pnum, nid); |
| 364 | } |
| 365 | static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages) |
| 366 | { |
| 367 | return; /* XXX: Not implemented yet */ |
| 368 | } |
| 369 | #else |
Dave Hansen | 0b0acbe | 2005-10-29 18:16:55 -0700 | [diff] [blame] | 370 | static struct page *__kmalloc_section_memmap(unsigned long nr_pages) |
| 371 | { |
| 372 | struct page *page, *ret; |
| 373 | unsigned long memmap_size = sizeof(struct page) * nr_pages; |
| 374 | |
Yasunori Goto | f2d0aa5 | 2006-10-28 10:38:32 -0700 | [diff] [blame] | 375 | page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size)); |
Dave Hansen | 0b0acbe | 2005-10-29 18:16:55 -0700 | [diff] [blame] | 376 | if (page) |
| 377 | goto got_map_page; |
| 378 | |
| 379 | ret = vmalloc(memmap_size); |
| 380 | if (ret) |
| 381 | goto got_map_ptr; |
| 382 | |
| 383 | return NULL; |
| 384 | got_map_page: |
| 385 | ret = (struct page *)pfn_to_kaddr(page_to_pfn(page)); |
| 386 | got_map_ptr: |
| 387 | memset(ret, 0, memmap_size); |
| 388 | |
| 389 | return ret; |
| 390 | } |
| 391 | |
Yasunori Goto | 98f3cfc | 2007-10-16 01:26:14 -0700 | [diff] [blame] | 392 | static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid, |
| 393 | unsigned long nr_pages) |
| 394 | { |
| 395 | return __kmalloc_section_memmap(nr_pages); |
| 396 | } |
| 397 | |
Dave Hansen | 0b0acbe | 2005-10-29 18:16:55 -0700 | [diff] [blame] | 398 | static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages) |
| 399 | { |
Christoph Lameter | 9e2779f | 2008-02-04 22:28:34 -0800 | [diff] [blame] | 400 | if (is_vmalloc_addr(memmap)) |
Dave Hansen | 0b0acbe | 2005-10-29 18:16:55 -0700 | [diff] [blame] | 401 | vfree(memmap); |
| 402 | else |
| 403 | free_pages((unsigned long)memmap, |
| 404 | get_order(sizeof(struct page) * nr_pages)); |
| 405 | } |
Yasunori Goto | 98f3cfc | 2007-10-16 01:26:14 -0700 | [diff] [blame] | 406 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
Dave Hansen | 0b0acbe | 2005-10-29 18:16:55 -0700 | [diff] [blame] | 407 | |
Badari Pulavarty | ea01ea9 | 2008-04-28 02:12:01 -0700 | [diff] [blame] | 408 | static void free_section_usemap(struct page *memmap, unsigned long *usemap) |
| 409 | { |
| 410 | if (!usemap) |
| 411 | return; |
| 412 | |
| 413 | /* |
| 414 | * Check to see if allocation came from hot-plug-add |
| 415 | */ |
| 416 | if (PageSlab(virt_to_page(usemap))) { |
| 417 | kfree(usemap); |
| 418 | if (memmap) |
| 419 | __kfree_section_memmap(memmap, PAGES_PER_SECTION); |
| 420 | return; |
| 421 | } |
| 422 | |
| 423 | /* |
| 424 | * TODO: Allocations came from bootmem - how do I free up ? |
| 425 | */ |
| 426 | printk(KERN_WARNING "Not freeing up allocations from bootmem " |
| 427 | "- leaking memory\n"); |
| 428 | } |
| 429 | |
Andy Whitcroft | 29751f6 | 2005-06-23 00:08:00 -0700 | [diff] [blame] | 430 | /* |
Andy Whitcroft | 29751f6 | 2005-06-23 00:08:00 -0700 | [diff] [blame] | 431 | * returns the number of sections whose mem_maps were properly |
| 432 | * set. If this is <=0, then that means that the passed-in |
| 433 | * map was not consumed and must be freed. |
| 434 | */ |
Dave Hansen | 0b0acbe | 2005-10-29 18:16:55 -0700 | [diff] [blame] | 435 | int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, |
| 436 | int nr_pages) |
Andy Whitcroft | 29751f6 | 2005-06-23 00:08:00 -0700 | [diff] [blame] | 437 | { |
Dave Hansen | 0b0acbe | 2005-10-29 18:16:55 -0700 | [diff] [blame] | 438 | unsigned long section_nr = pfn_to_section_nr(start_pfn); |
| 439 | struct pglist_data *pgdat = zone->zone_pgdat; |
| 440 | struct mem_section *ms; |
| 441 | struct page *memmap; |
Mel Gorman | 5c0e306 | 2007-10-16 01:25:56 -0700 | [diff] [blame] | 442 | unsigned long *usemap; |
Dave Hansen | 0b0acbe | 2005-10-29 18:16:55 -0700 | [diff] [blame] | 443 | unsigned long flags; |
| 444 | int ret; |
Andy Whitcroft | 29751f6 | 2005-06-23 00:08:00 -0700 | [diff] [blame] | 445 | |
Dave Hansen | 0b0acbe | 2005-10-29 18:16:55 -0700 | [diff] [blame] | 446 | /* |
| 447 | * no locking for this, because it does its own |
| 448 | * plus, it does a kmalloc |
| 449 | */ |
WANG Cong | bbd0682 | 2007-12-17 16:19:59 -0800 | [diff] [blame] | 450 | ret = sparse_index_init(section_nr, pgdat->node_id); |
| 451 | if (ret < 0 && ret != -EEXIST) |
| 452 | return ret; |
Yasunori Goto | 98f3cfc | 2007-10-16 01:26:14 -0700 | [diff] [blame] | 453 | memmap = kmalloc_section_memmap(section_nr, pgdat->node_id, nr_pages); |
WANG Cong | bbd0682 | 2007-12-17 16:19:59 -0800 | [diff] [blame] | 454 | if (!memmap) |
| 455 | return -ENOMEM; |
Mel Gorman | 5c0e306 | 2007-10-16 01:25:56 -0700 | [diff] [blame] | 456 | usemap = __kmalloc_section_usemap(); |
WANG Cong | bbd0682 | 2007-12-17 16:19:59 -0800 | [diff] [blame] | 457 | if (!usemap) { |
| 458 | __kfree_section_memmap(memmap, nr_pages); |
| 459 | return -ENOMEM; |
| 460 | } |
Andy Whitcroft | 29751f6 | 2005-06-23 00:08:00 -0700 | [diff] [blame] | 461 | |
Dave Hansen | 0b0acbe | 2005-10-29 18:16:55 -0700 | [diff] [blame] | 462 | pgdat_resize_lock(pgdat, &flags); |
| 463 | |
| 464 | ms = __pfn_to_section(start_pfn); |
| 465 | if (ms->section_mem_map & SECTION_MARKED_PRESENT) { |
| 466 | ret = -EEXIST; |
| 467 | goto out; |
| 468 | } |
Mel Gorman | 5c0e306 | 2007-10-16 01:25:56 -0700 | [diff] [blame] | 469 | |
Andy Whitcroft | 29751f6 | 2005-06-23 00:08:00 -0700 | [diff] [blame] | 470 | ms->section_mem_map |= SECTION_MARKED_PRESENT; |
| 471 | |
Mel Gorman | 5c0e306 | 2007-10-16 01:25:56 -0700 | [diff] [blame] | 472 | ret = sparse_init_one_section(ms, section_nr, memmap, usemap); |
Dave Hansen | 0b0acbe | 2005-10-29 18:16:55 -0700 | [diff] [blame] | 473 | |
Dave Hansen | 0b0acbe | 2005-10-29 18:16:55 -0700 | [diff] [blame] | 474 | out: |
| 475 | pgdat_resize_unlock(pgdat, &flags); |
WANG Cong | bbd0682 | 2007-12-17 16:19:59 -0800 | [diff] [blame] | 476 | if (ret <= 0) { |
| 477 | kfree(usemap); |
Mike Kravetz | 46a66ee | 2006-05-01 12:16:09 -0700 | [diff] [blame] | 478 | __kfree_section_memmap(memmap, nr_pages); |
WANG Cong | bbd0682 | 2007-12-17 16:19:59 -0800 | [diff] [blame] | 479 | } |
Dave Hansen | 0b0acbe | 2005-10-29 18:16:55 -0700 | [diff] [blame] | 480 | return ret; |
Andy Whitcroft | 29751f6 | 2005-06-23 00:08:00 -0700 | [diff] [blame] | 481 | } |
Badari Pulavarty | ea01ea9 | 2008-04-28 02:12:01 -0700 | [diff] [blame] | 482 | |
| 483 | void sparse_remove_one_section(struct zone *zone, struct mem_section *ms) |
| 484 | { |
| 485 | struct page *memmap = NULL; |
| 486 | unsigned long *usemap = NULL; |
| 487 | |
| 488 | if (ms->section_mem_map) { |
| 489 | usemap = ms->pageblock_flags; |
| 490 | memmap = sparse_decode_mem_map(ms->section_mem_map, |
| 491 | __section_nr(ms)); |
| 492 | ms->section_mem_map = 0; |
| 493 | ms->pageblock_flags = NULL; |
| 494 | } |
| 495 | |
| 496 | free_section_usemap(memmap, usemap); |
| 497 | } |
Yasunori Goto | a3142c8 | 2007-05-08 00:23:07 -0700 | [diff] [blame] | 498 | #endif |