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