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/nmi.h>
  21 #include <linux/swap.h>
  22
  23 #include <asm/meminit.h>
  24 #include <asm/pgalloc.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/sections.h>
  27 #include <asm/mca.h>
  28
  29 #ifdef CONFIG_VIRTUAL_MEM_MAP
  30 static unsigned long max_gap;
  31 #endif
  32
  33 /**
  34  * show_mem - give short summary of memory stats
  35  *
  36  * Shows a simple page count of reserved and used pages in the system.
  37  * For discontig machines, it does this on a per-pgdat basis.
  38  */
  39 void show_mem(void)
  40 {
  41         int i, total_reserved = 0;
  42         int total_shared = 0, total_cached = 0;
  43         unsigned long total_present = 0;
  44         pg_data_t *pgdat;
  45
  46         printk(KERN_INFO "Mem-info:\n");
  47         show_free_areas();
  48         printk(KERN_INFO "Node memory in pages:\n");
  49         for_each_online_pgdat(pgdat) {
  50                 unsigned long present;
  51                 unsigned long flags;
  52                 int shared = 0, cached = 0, reserved = 0;
  53
  54                 pgdat_resize_lock(pgdat, &flags);
  55                 present = pgdat->node_present_pages;
  56                 for(i = 0; i < pgdat->node_spanned_pages; i++) {
  57                         struct page *page;
  58                         if (unlikely(i % MAX_ORDER_NR_PAGES == 0))
  59                                 touch_nmi_watchdog();
  60                         if (pfn_valid(pgdat->node_start_pfn + i))
  61                                 page = pfn_to_page(pgdat->node_start_pfn + i);
  62                         else {
  63 #ifdef CONFIG_VIRTUAL_MEM_MAP
  64                                 if (max_gap < LARGE_GAP)
  65                                         continue;
  66 #endif
  67                                 i = vmemmap_find_next_valid_pfn(pgdat->node_id,
  68                                          i) - 1;
  69                                 continue;
  70                         }
  71                         if (PageReserved(page))
  72                                 reserved++;
  73                         else if (PageSwapCache(page))
  74                                 cached++;
  75                         else if (page_count(page))
  76                                 shared += page_count(page)-1;
  77                 }
  78                 pgdat_resize_unlock(pgdat, &flags);
  79                 total_present += present;
  80                 total_reserved += reserved;
  81                 total_cached += cached;
  82                 total_shared += shared;
  83                 printk(KERN_INFO "Node %4d:  RAM: %11ld, rsvd: %8d, "
  84                        "shrd: %10d, swpd: %10d\n", pgdat->node_id,
  85                        present, reserved, shared, cached);
  86         }
  87         printk(KERN_INFO "%ld pages of RAM\n", total_present);
  88         printk(KERN_INFO "%d reserved pages\n", total_reserved);
  89         printk(KERN_INFO "%d pages shared\n", total_shared);
  90         printk(KERN_INFO "%d pages swap cached\n", total_cached);
  91         printk(KERN_INFO "Total of %ld pages in page table cache\n",
  92                quicklist_total_size());
  93         printk(KERN_INFO "%d free buffer pages\n", nr_free_buffer_pages());
  94 }
  95
  96
  97 /* physical address where the bootmem map is located */
  98 unsigned long bootmap_start;
  99
 100 /**
 101  * find_bootmap_location - callback to find a memory area for the bootmap
 102  * @start: start of region
 103  * @end: end of region
 104  * @arg: unused callback data
 105  *
 106  * Find a place to put the bootmap and return its starting address in
 107  * bootmap_start.  This address must be page-aligned.
 108  */
 109 static int __init
 110 find_bootmap_location (unsigned long start, unsigned long end, void *arg)
 111 {
 112         unsigned long needed = *(unsigned long *)arg;
 113         unsigned long range_start, range_end, free_start;
 114         int i;
 115
 116 #if IGNORE_PFN0
 117         if (start == PAGE_OFFSET) {
 118                 start += PAGE_SIZE;
 119                 if (start >= end)
 120                         return 0;
 121         }
 122 #endif
 123
 124         free_start = PAGE_OFFSET;
 125
 126         for (i = 0; i < num_rsvd_regions; i++) {
 127                 range_start = max(start, free_start);
 128                 range_end   = min(end, rsvd_region[i].start & PAGE_MASK);
 129
 130                 free_start = PAGE_ALIGN(rsvd_region[i].end);
 131
 132                 if (range_end <= range_start)
 133                         continue; /* skip over empty range */
 134
 135                 if (range_end - range_start >= needed) {
 136                         bootmap_start = __pa(range_start);
 137                         return -1;      /* done */
 138                 }
 139
 140                 /* nothing more available in this segment */
 141                 if (range_end == end)
 142                         return 0;
 143         }
 144         return 0;
 145 }
 146
 147 #ifdef CONFIG_SMP
 148 static void *cpu_data;
 149 /**
 150  * per_cpu_init - setup per-cpu variables
 151  *
 152  * Allocate and setup per-cpu data areas.
 153  */
 154 void * __cpuinit
 155 per_cpu_init (void)
 156 {
 157         int cpu;
 158         static int first_time=1;
 159
 160         /*
 161          * get_free_pages() cannot be used before cpu_init() done.  BSP
 162          * allocates "NR_CPUS" pages for all CPUs to avoid that AP calls
 163          * get_zeroed_page().
 164          */
 165         if (first_time) {
 166                 first_time=0;
 167                 for (cpu = 0; cpu < NR_CPUS; cpu++) {
 168                         memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start);
 169                         __per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start;
 170                         cpu_data += PERCPU_PAGE_SIZE;
 171                         per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
 172                 }
 173         }
 174         return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
 175 }
 176
 177 static inline void
 178 alloc_per_cpu_data(void)
 179 {
 180         cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS,
 181                                    PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
 182 }
 183 #else
 184 #define alloc_per_cpu_data() do { } while (0)
 185 #endif /* CONFIG_SMP */
 186
 187 /**
 188  * find_memory - setup memory map
 189  *
 190  * Walk the EFI memory map and find usable memory for the system, taking
 191  * into account reserved areas.
 192  */
 193 void __init
 194 find_memory (void)
 195 {
 196         unsigned long bootmap_size;
 197
 198         reserve_memory();
 199
 200         /* first find highest page frame number */
 201         min_low_pfn = ~0UL;
 202         max_low_pfn = 0;
 203         efi_memmap_walk(find_max_min_low_pfn, NULL);
 204         max_pfn = max_low_pfn;
 205         /* how many bytes to cover all the pages */
 206         bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT;
 207
 208         /* look for a location to hold the bootmap */
 209         bootmap_start = ~0UL;
 210         efi_memmap_walk(find_bootmap_location, &bootmap_size);
 211         if (bootmap_start == ~0UL)
 212                 panic("Cannot find %ld bytes for bootmap\n", bootmap_size);
 213
 214         bootmap_size = init_bootmem_node(NODE_DATA(0),
 215                         (bootmap_start >> PAGE_SHIFT), 0, max_pfn);
 216
 217         /* Free all available memory, then mark bootmem-map as being in use. */
 218         efi_memmap_walk(filter_rsvd_memory, free_bootmem);
 219         reserve_bootmem(bootmap_start, bootmap_size, BOOTMEM_DEFAULT);
 220
 221         find_initrd();
 222
 223         alloc_per_cpu_data();
 224 }
 225
 226 static int
 227 count_pages (u64 start, u64 end, void *arg)
 228 {
 229         unsigned long *count = arg;
 230
 231         *count += (end - start) >> PAGE_SHIFT;
 232         return 0;
 233 }
 234
 235 /*
 236  * Set up the page tables.
 237  */
 238
 239 void __init
 240 paging_init (void)
 241 {
 242         unsigned long max_dma;
 243         unsigned long max_zone_pfns[MAX_NR_ZONES];
 244
 245         num_physpages = 0;
 246         efi_memmap_walk(count_pages, &num_physpages);
 247
 248         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 249 #ifdef CONFIG_ZONE_DMA
 250         max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 251         max_zone_pfns[ZONE_DMA] = max_dma;
 252 #endif
 253         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 254
 255 #ifdef CONFIG_VIRTUAL_MEM_MAP
 256         efi_memmap_walk(filter_memory, register_active_ranges);
 257         efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
 258         if (max_gap < LARGE_GAP) {
 259                 vmem_map = (struct page *) 0;
 260                 free_area_init_nodes(max_zone_pfns);
 261         } else {
 262                 unsigned long map_size;
 263
 264                 /* allocate virtual_mem_map */
 265
 266                 map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) *
 267                         sizeof(struct page));
 268                 vmalloc_end -= map_size;
 269                 vmem_map = (struct page *) vmalloc_end;
 270                 efi_memmap_walk(create_mem_map_page_table, NULL);
 271
 272                 /*
 273                  * alloc_node_mem_map makes an adjustment for mem_map
 274                  * which isn't compatible with vmem_map.
 275                  */
 276                 NODE_DATA(0)->node_mem_map = vmem_map +
 277                         find_min_pfn_with_active_regions();
 278                 free_area_init_nodes(max_zone_pfns);
 279
 280                 printk("Virtual mem_map starts at 0x%p\n", mem_map);
 281         }
 282 #else /* !CONFIG_VIRTUAL_MEM_MAP */
 283         add_active_range(0, 0, max_low_pfn);
 284         free_area_init_nodes(max_zone_pfns);
 285 #endif /* !CONFIG_VIRTUAL_MEM_MAP */
 286         zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
 287 }