git.oblomov.eu Git - linux-2.6/blob - 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 max_gap;
  30 #endif
  31
  32 /**
  33  * show_mem - give short summary of memory stats
  34  *
  35  * Shows a simple page count of reserved and used pages in the system.
  36  * For discontig machines, it does this on a per-pgdat basis.
  37  */
  38 void show_mem(void)
  39 {
  40         int i, total_reserved = 0;
  41         int total_shared = 0, total_cached = 0;
  42         unsigned long total_present = 0;
  43         pg_data_t *pgdat;
  44
  45         printk(KERN_INFO "Mem-info:\n");
  46         show_free_areas();
  47         printk(KERN_INFO "Free swap:       %6ldkB\n",
  48                nr_swap_pages<<(PAGE_SHIFT-10));
  49         printk(KERN_INFO "Node memory in pages:\n");
  50         for_each_online_pgdat(pgdat) {
  51                 unsigned long present;
  52                 unsigned long flags;
  53                 int shared = 0, cached = 0, reserved = 0;
  54
  55                 pgdat_resize_lock(pgdat, &flags);
  56                 present = pgdat->node_present_pages;
  57                 for(i = 0; i < pgdat->node_spanned_pages; i++) {
  58                         struct page *page;
  59                         if (pfn_valid(pgdat->node_start_pfn + i))
  60                                 page = pfn_to_page(pgdat->node_start_pfn + i);
  61                         else {
  62 #ifdef CONFIG_VIRTUAL_MEM_MAP
  63                                 if (max_gap < LARGE_GAP)
  64                                         continue;
  65 #endif
  66                                 i = vmemmap_find_next_valid_pfn(pgdat->node_id,
  67                                          i) - 1;
  68                                 continue;
  69                         }
  70                         if (PageReserved(page))
  71                                 reserved++;
  72                         else if (PageSwapCache(page))
  73                                 cached++;
  74                         else if (page_count(page))
  75                                 shared += page_count(page)-1;
  76                 }
  77                 pgdat_resize_unlock(pgdat, &flags);
  78                 total_present += present;
  79                 total_reserved += reserved;
  80                 total_cached += cached;
  81                 total_shared += shared;
  82                 printk(KERN_INFO "Node %4d:  RAM: %11ld, rsvd: %8d, "
  83                        "shrd: %10d, swpd: %10d\n", pgdat->node_id,
  84                        present, reserved, shared, cached);
  85         }
  86         printk(KERN_INFO "%ld pages of RAM\n", total_present);
  87         printk(KERN_INFO "%d reserved pages\n", total_reserved);
  88         printk(KERN_INFO "%d pages shared\n", total_shared);
  89         printk(KERN_INFO "%d pages swap cached\n", total_cached);
  90         printk(KERN_INFO "Total of %ld pages in page table cache\n",
  91                pgtable_quicklist_total_size());
  92         printk(KERN_INFO "%d free buffer pages\n", nr_free_buffer_pages());
  93 }
  94
  95
  96 /* physical address where the bootmem map is located */
  97 unsigned long bootmap_start;
  98
  99 /**
 100  * find_max_pfn - adjust the maximum page number callback
 101  * @start: start of range
 102  * @end: end of range
 103  * @arg: address of pointer to global max_pfn variable
 104  *
 105  * Passed as a callback function to efi_memmap_walk() to determine the highest
 106  * available page frame number in the system.
 107  */
 108 int
 109 find_max_pfn (unsigned long start, unsigned long end, void *arg)
 110 {
 111         unsigned long *max_pfnp = arg, pfn;
 112
 113         pfn = (PAGE_ALIGN(end - 1) - PAGE_OFFSET) >> PAGE_SHIFT;
 114         if (pfn > *max_pfnp)
 115                 *max_pfnp = pfn;
 116         return 0;
 117 }
 118
 119 /**
 120  * find_bootmap_location - callback to find a memory area for the bootmap
 121  * @start: start of region
 122  * @end: end of region
 123  * @arg: unused callback data
 124  *
 125  * Find a place to put the bootmap and return its starting address in
 126  * bootmap_start.  This address must be page-aligned.
 127  */
 128 static int __init
 129 find_bootmap_location (unsigned long start, unsigned long end, void *arg)
 130 {
 131         unsigned long needed = *(unsigned long *)arg;
 132         unsigned long range_start, range_end, free_start;
 133         int i;
 134
 135 #if IGNORE_PFN0
 136         if (start == PAGE_OFFSET) {
 137                 start += PAGE_SIZE;
 138                 if (start >= end)
 139                         return 0;
 140         }
 141 #endif
 142
 143         free_start = PAGE_OFFSET;
 144
 145         for (i = 0; i < num_rsvd_regions; i++) {
 146                 range_start = max(start, free_start);
 147                 range_end   = min(end, rsvd_region[i].start & PAGE_MASK);
 148
 149                 free_start = PAGE_ALIGN(rsvd_region[i].end);
 150
 151                 if (range_end <= range_start)
 152                         continue; /* skip over empty range */
 153
 154                 if (range_end - range_start >= needed) {
 155                         bootmap_start = __pa(range_start);
 156                         return -1;      /* done */
 157                 }
 158
 159                 /* nothing more available in this segment */
 160                 if (range_end == end)
 161                         return 0;
 162         }
 163         return 0;
 164 }
 165
 166 /**
 167  * find_memory - setup memory map
 168  *
 169  * Walk the EFI memory map and find usable memory for the system, taking
 170  * into account reserved areas.
 171  */
 172 void __init
 173 find_memory (void)
 174 {
 175         unsigned long bootmap_size;
 176
 177         reserve_memory();
 178
 179         /* first find highest page frame number */
 180         max_pfn = 0;
 181         efi_memmap_walk(find_max_pfn, &max_pfn);
 182
 183         /* how many bytes to cover all the pages */
 184         bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT;
 185
 186         /* look for a location to hold the bootmap */
 187         bootmap_start = ~0UL;
 188         efi_memmap_walk(find_bootmap_location, &bootmap_size);
 189         if (bootmap_start == ~0UL)
 190                 panic("Cannot find %ld bytes for bootmap\n", bootmap_size);
 191
 192         bootmap_size = init_bootmem(bootmap_start >> PAGE_SHIFT, max_pfn);
 193
 194         /* Free all available memory, then mark bootmem-map as being in use. */
 195         efi_memmap_walk(filter_rsvd_memory, free_bootmem);
 196         reserve_bootmem(bootmap_start, bootmap_size);
 197
 198         find_initrd();
 199
 200 #ifdef CONFIG_CRASH_DUMP
 201         /* If we are doing a crash dump, we still need to know the real mem
 202          * size before original memory map is reset. */
 203         saved_max_pfn = max_pfn;
 204 #endif
 205 }
 206
 207 #ifdef CONFIG_SMP
 208 /**
 209  * per_cpu_init - setup per-cpu variables
 210  *
 211  * Allocate and setup per-cpu data areas.
 212  */
 213 void * __cpuinit
 214 per_cpu_init (void)
 215 {
 216         void *cpu_data;
 217         int cpu;
 218         static int first_time=1;
 219
 220         /*
 221          * get_free_pages() cannot be used before cpu_init() done.  BSP
 222          * allocates "NR_CPUS" pages for all CPUs to avoid that AP calls
 223          * get_zeroed_page().
 224          */
 225         if (first_time) {
 226                 first_time=0;
 227                 cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS,
 228                                            PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
 229                 for (cpu = 0; cpu < NR_CPUS; cpu++) {
 230                         memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start);
 231                         __per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start;
 232                         cpu_data += PERCPU_PAGE_SIZE;
 233                         per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
 234                 }
 235         }
 236         return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
 237 }
 238 #endif /* CONFIG_SMP */
 239
 240 static int
 241 count_pages (u64 start, u64 end, void *arg)
 242 {
 243         unsigned long *count = arg;
 244
 245         *count += (end - start) >> PAGE_SHIFT;
 246         return 0;
 247 }
 248
 249 /*
 250  * Set up the page tables.
 251  */
 252
 253 void __init
 254 paging_init (void)
 255 {
 256         unsigned long max_dma;
 257         unsigned long max_zone_pfns[MAX_NR_ZONES];
 258
 259         num_physpages = 0;
 260         efi_memmap_walk(count_pages, &num_physpages);
 261
 262         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 263 #ifdef CONFIG_ZONE_DMA
 264         max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 265         max_zone_pfns[ZONE_DMA] = max_dma;
 266 #endif
 267         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 268
 269 #ifdef CONFIG_VIRTUAL_MEM_MAP
 270         efi_memmap_walk(register_active_ranges, NULL);
 271         efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
 272         if (max_gap < LARGE_GAP) {
 273                 vmem_map = (struct page *) 0;
 274                 free_area_init_nodes(max_zone_pfns);
 275         } else {
 276                 unsigned long map_size;
 277
 278                 /* allocate virtual_mem_map */
 279
 280                 map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) *
 281                         sizeof(struct page));
 282                 vmalloc_end -= map_size;
 283                 vmem_map = (struct page *) vmalloc_end;
 284                 efi_memmap_walk(create_mem_map_page_table, NULL);
 285
 286                 /*
 287                  * alloc_node_mem_map makes an adjustment for mem_map
 288                  * which isn't compatible with vmem_map.
 289                  */
 290                 NODE_DATA(0)->node_mem_map = vmem_map +
 291                         find_min_pfn_with_active_regions();
 292                 free_area_init_nodes(max_zone_pfns);
 293
 294                 printk("Virtual mem_map starts at 0x%p\n", mem_map);
 295         }
 296 #else /* !CONFIG_VIRTUAL_MEM_MAP */
 297         add_active_range(0, 0, max_low_pfn);
 298         free_area_init_nodes(max_zone_pfns);
 299 #endif /* !CONFIG_VIRTUAL_MEM_MAP */
 300         zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
 301 }