arch/ia64/mm/contig.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1998-2003 Hewlett-Packard Co
   7  *      David Mosberger-Tang <davidm@hpl.hp.com>
   8  *      Stephane Eranian <eranian@hpl.hp.com>
   9  * Copyright (C) 2000, Rohit Seth <rohit.seth@intel.com>
  10  * Copyright (C) 1999 VA Linux Systems
  11  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
  12  * Copyright (C) 2003 Silicon Graphics, Inc. All rights reserved.
  13  *
  14  * Routines used by ia64 machines with contiguous (or virtually contiguous)
  15  * memory.
  16  */
  17 #include <linux/bootmem.h>
  18 #include <linux/efi.h>
  19 #include <linux/mm.h>
  20 #include <linux/swap.h>
  21
  22 #include <asm/meminit.h>
  23 #include <asm/pgalloc.h>
  24 #include <asm/pgtable.h>
  25 #include <asm/sections.h>
  26 #include <asm/mca.h>
  27
  28 #ifdef CONFIG_VIRTUAL_MEM_MAP
  29 static unsigned long num_dma_physpages;
  30 static unsigned long max_gap;
  31 #endif
  32
  33 /**
  34  * show_mem - display a memory statistics summary
  35  *
  36  * Just walks the pages in the system and describes where they're allocated.
  37  */
  38 void
  39 show_mem (void)
  40 {
  41         int i, total = 0, reserved = 0;
  42         int shared = 0, cached = 0;
  43
  44         printk(KERN_INFO "Mem-info:\n");
  45         show_free_areas();
  46
  47         printk(KERN_INFO "Free swap:       %6ldkB\n",
  48                nr_swap_pages<<(PAGE_SHIFT-10));
  49         i = max_mapnr;
  50         for (i = 0; i < max_mapnr; i++) {
  51                 if (!pfn_valid(i)) {
  52 #ifdef CONFIG_VIRTUAL_MEM_MAP
  53                         if (max_gap < LARGE_GAP)
  54                                 continue;
  55                         i = vmemmap_find_next_valid_pfn(0, i) - 1;
  56 #endif
  57                         continue;
  58                 }
  59                 total++;
  60                 if (PageReserved(mem_map+i))
  61                         reserved++;
  62                 else if (PageSwapCache(mem_map+i))
  63                         cached++;
  64                 else if (page_count(mem_map + i))
  65                         shared += page_count(mem_map + i) - 1;
  66         }
  67         printk(KERN_INFO "%d pages of RAM\n", total);
  68         printk(KERN_INFO "%d reserved pages\n", reserved);
  69         printk(KERN_INFO "%d pages shared\n", shared);
  70         printk(KERN_INFO "%d pages swap cached\n", cached);
  71         printk(KERN_INFO "%ld pages in page table cache\n",
  72                pgtable_quicklist_total_size());
  73 }
  74
  75 /* physical address where the bootmem map is located */
  76 unsigned long bootmap_start;
  77
  78 /**
  79  * find_max_pfn - adjust the maximum page number callback
  80  * @start: start of range
  81  * @end: end of range
  82  * @arg: address of pointer to global max_pfn variable
  83  *
  84  * Passed as a callback function to efi_memmap_walk() to determine the highest
  85  * available page frame number in the system.
  86  */
  87 int
  88 find_max_pfn (unsigned long start, unsigned long end, void *arg)
  89 {
  90         unsigned long *max_pfnp = arg, pfn;
  91
  92         pfn = (PAGE_ALIGN(end - 1) - PAGE_OFFSET) >> PAGE_SHIFT;
  93         if (pfn > *max_pfnp)
  94                 *max_pfnp = pfn;
  95         return 0;
  96 }
  97
  98 /**
  99  * find_bootmap_location - callback to find a memory area for the bootmap
 100  * @start: start of region
 101  * @end: end of region
 102  * @arg: unused callback data
 103  *
 104  * Find a place to put the bootmap and return its starting address in
 105  * bootmap_start.  This address must be page-aligned.
 106  */
 107 static int __init
 108 find_bootmap_location (unsigned long start, unsigned long end, void *arg)
 109 {
 110         unsigned long needed = *(unsigned long *)arg;
 111         unsigned long range_start, range_end, free_start;
 112         int i;
 113
 114 #if IGNORE_PFN0
 115         if (start == PAGE_OFFSET) {
 116                 start += PAGE_SIZE;
 117                 if (start >= end)
 118                         return 0;
 119         }
 120 #endif
 121
 122         free_start = PAGE_OFFSET;
 123
 124         for (i = 0; i < num_rsvd_regions; i++) {
 125                 range_start = max(start, free_start);
 126                 range_end   = min(end, rsvd_region[i].start & PAGE_MASK);
 127
 128                 free_start = PAGE_ALIGN(rsvd_region[i].end);
 129
 130                 if (range_end <= range_start)
 131                         continue; /* skip over empty range */
 132
 133                 if (range_end - range_start >= needed) {
 134                         bootmap_start = __pa(range_start);
 135                         return -1;      /* done */
 136                 }
 137
 138                 /* nothing more available in this segment */
 139                 if (range_end == end)
 140                         return 0;
 141         }
 142         return 0;
 143 }
 144
 145 /**
 146  * find_memory - setup memory map
 147  *
 148  * Walk the EFI memory map and find usable memory for the system, taking
 149  * into account reserved areas.
 150  */
 151 void __init
 152 find_memory (void)
 153 {
 154         unsigned long bootmap_size;
 155
 156         reserve_memory();
 157
 158         /* first find highest page frame number */
 159         max_pfn = 0;
 160         efi_memmap_walk(find_max_pfn, &max_pfn);
 161
 162         /* how many bytes to cover all the pages */
 163         bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT;
 164
 165         /* look for a location to hold the bootmap */
 166         bootmap_start = ~0UL;
 167         efi_memmap_walk(find_bootmap_location, &bootmap_size);
 168         if (bootmap_start == ~0UL)
 169                 panic("Cannot find %ld bytes for bootmap\n", bootmap_size);
 170
 171         bootmap_size = init_bootmem(bootmap_start >> PAGE_SHIFT, max_pfn);
 172
 173         /* Free all available memory, then mark bootmem-map as being in use. */
 174         efi_memmap_walk(filter_rsvd_memory, free_bootmem);
 175         reserve_bootmem(bootmap_start, bootmap_size);
 176
 177         find_initrd();
 178 }
 179
 180 #ifdef CONFIG_SMP
 181 /**
 182  * per_cpu_init - setup per-cpu variables
 183  *
 184  * Allocate and setup per-cpu data areas.
 185  */
 186 void * __cpuinit
 187 per_cpu_init (void)
 188 {
 189         void *cpu_data;
 190         int cpu;
 191         static int first_time=1;
 192
 193         /*
 194          * get_free_pages() cannot be used before cpu_init() done.  BSP
 195          * allocates "NR_CPUS" pages for all CPUs to avoid that AP calls
 196          * get_zeroed_page().
 197          */
 198         if (first_time) {
 199                 first_time=0;
 200                 cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS,
 201                                            PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
 202                 for (cpu = 0; cpu < NR_CPUS; cpu++) {
 203                         memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start);
 204                         __per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start;
 205                         cpu_data += PERCPU_PAGE_SIZE;
 206                         per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
 207                 }
 208         }
 209         return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
 210 }
 211 #endif /* CONFIG_SMP */
 212
 213 static int
 214 count_pages (u64 start, u64 end, void *arg)
 215 {
 216         unsigned long *count = arg;
 217
 218         *count += (end - start) >> PAGE_SHIFT;
 219         return 0;
 220 }
 221
 222 #ifdef CONFIG_VIRTUAL_MEM_MAP
 223 static int
 224 count_dma_pages (u64 start, u64 end, void *arg)
 225 {
 226         unsigned long *count = arg;
 227
 228         if (start < MAX_DMA_ADDRESS)
 229                 *count += (min(end, MAX_DMA_ADDRESS) - start) >> PAGE_SHIFT;
 230         return 0;
 231 }
 232 #endif
 233
 234 /*
 235  * Set up the page tables.
 236  */
 237
 238 void __init
 239 paging_init (void)
 240 {
 241         unsigned long max_dma;
 242         unsigned long zones_size[MAX_NR_ZONES];
 243 #ifdef CONFIG_VIRTUAL_MEM_MAP
 244         unsigned long zholes_size[MAX_NR_ZONES];
 245 #endif
 246
 247         /* initialize mem_map[] */
 248
 249         memset(zones_size, 0, sizeof(zones_size));
 250
 251         num_physpages = 0;
 252         efi_memmap_walk(count_pages, &num_physpages);
 253
 254         max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 255
 256 #ifdef CONFIG_VIRTUAL_MEM_MAP
 257         memset(zholes_size, 0, sizeof(zholes_size));
 258
 259         num_dma_physpages = 0;
 260         efi_memmap_walk(count_dma_pages, &num_dma_physpages);
 261
 262         if (max_low_pfn < max_dma) {
 263                 zones_size[ZONE_DMA] = max_low_pfn;
 264                 zholes_size[ZONE_DMA] = max_low_pfn - num_dma_physpages;
 265         } else {
 266                 zones_size[ZONE_DMA] = max_dma;
 267                 zholes_size[ZONE_DMA] = max_dma - num_dma_physpages;
 268                 if (num_physpages > num_dma_physpages) {
 269                         zones_size[ZONE_NORMAL] = max_low_pfn - max_dma;
 270                         zholes_size[ZONE_NORMAL] =
 271                                 ((max_low_pfn - max_dma) -
 272                                  (num_physpages - num_dma_physpages));
 273                 }
 274         }
 275
 276         efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
 277         if (max_gap < LARGE_GAP) {
 278                 vmem_map = (struct page *) 0;
 279                 free_area_init_node(0, NODE_DATA(0), zones_size, 0,
 280                                     zholes_size);
 281         } else {
 282                 unsigned long map_size;
 283
 284                 /* allocate virtual_mem_map */
 285
 286                 map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) *
 287                         sizeof(struct page));
 288                 vmalloc_end -= map_size;
 289                 vmem_map = (struct page *) vmalloc_end;
 290                 efi_memmap_walk(create_mem_map_page_table, NULL);
 291
 292                 NODE_DATA(0)->node_mem_map = vmem_map;
 293                 free_area_init_node(0, NODE_DATA(0), zones_size,
 294                                     0, zholes_size);
 295
 296                 printk("Virtual mem_map starts at 0x%p\n", mem_map);
 297         }
 298 #else /* !CONFIG_VIRTUAL_MEM_MAP */
 299         if (max_low_pfn < max_dma)
 300                 zones_size[ZONE_DMA] = max_low_pfn;
 301         else {
 302                 zones_size[ZONE_DMA] = max_dma;
 303                 zones_size[ZONE_NORMAL] = max_low_pfn - max_dma;
 304         }
 305         free_area_init(zones_size);
 306 #endif /* !CONFIG_VIRTUAL_MEM_MAP */
 307         zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
 308 }