release/src-rt-6.x.4708/linux/linux-2.6.36/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 (u64 start, u64 end, void *arg)
 111 {
 112         u64 needed = *(unsigned long *)arg;
 113         u64 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         static bool first_time = true;
 158         void *cpu0_data = __cpu0_per_cpu;
 159         unsigned int cpu;
 160
 161         if (!first_time)
 162                 goto skip;
 163         first_time = false;
 164
 165         /*
 166          * get_free_pages() cannot be used before cpu_init() done.
 167          * BSP allocates PERCPU_PAGE_SIZE bytes for all possible CPUs
 168          * to avoid that AP calls get_zeroed_page().
 169          */
 170         for_each_possible_cpu(cpu) {
 171                 void *src = cpu == 0 ? cpu0_data : __phys_per_cpu_start;
 172
 173                 memcpy(cpu_data, src, __per_cpu_end - __per_cpu_start);
 174                 __per_cpu_offset[cpu] = (char *)cpu_data - __per_cpu_start;
 175                 per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
 176
 177                 /*
 178                  * percpu area for cpu0 is moved from the __init area
 179                  * which is setup by head.S and used till this point.
 180                  * Update ar.k3.  This move is ensures that percpu
 181                  * area for cpu0 is on the correct node and its
 182                  * virtual address isn't insanely far from other
 183                  * percpu areas which is important for congruent
 184                  * percpu allocator.
 185                  */
 186                 if (cpu == 0)
 187                         ia64_set_kr(IA64_KR_PER_CPU_DATA, __pa(cpu_data) -
 188                                     (unsigned long)__per_cpu_start);
 189
 190                 cpu_data += PERCPU_PAGE_SIZE;
 191         }
 192 skip:
 193         return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
 194 }
 195
 196 static inline void
 197 alloc_per_cpu_data(void)
 198 {
 199         cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * num_possible_cpus(),
 200                                    PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
 201 }
 202
 203 /**
 204  * setup_per_cpu_areas - setup percpu areas
 205  *
 206  * Arch code has already allocated and initialized percpu areas.  All
 207  * this function has to do is to teach the determined layout to the
 208  * dynamic percpu allocator, which happens to be more complex than
 209  * creating whole new ones using helpers.
 210  */
 211 void __init
 212 setup_per_cpu_areas(void)
 213 {
 214         struct pcpu_alloc_info *ai;
 215         struct pcpu_group_info *gi;
 216         unsigned int cpu;
 217         ssize_t static_size, reserved_size, dyn_size;
 218         int rc;
 219
 220         ai = pcpu_alloc_alloc_info(1, num_possible_cpus());
 221         if (!ai)
 222                 panic("failed to allocate pcpu_alloc_info");
 223         gi = &ai->groups[0];
 224
 225         /* units are assigned consecutively to possible cpus */
 226         for_each_possible_cpu(cpu)
 227                 gi->cpu_map[gi->nr_units++] = cpu;
 228
 229         /* set parameters */
 230         static_size = __per_cpu_end - __per_cpu_start;
 231         reserved_size = PERCPU_MODULE_RESERVE;
 232         dyn_size = PERCPU_PAGE_SIZE - static_size - reserved_size;
 233         if (dyn_size < 0)
 234                 panic("percpu area overflow static=%zd reserved=%zd\n",
 235                       static_size, reserved_size);
 236
 237         ai->static_size         = static_size;
 238         ai->reserved_size       = reserved_size;
 239         ai->dyn_size            = dyn_size;
 240         ai->unit_size           = PERCPU_PAGE_SIZE;
 241         ai->atom_size           = PAGE_SIZE;
 242         ai->alloc_size          = PERCPU_PAGE_SIZE;
 243
 244         rc = pcpu_setup_first_chunk(ai, __per_cpu_start + __per_cpu_offset[0]);
 245         if (rc)
 246                 panic("failed to setup percpu area (err=%d)", rc);
 247
 248         pcpu_free_alloc_info(ai);
 249 }
 250 #else
 251 #define alloc_per_cpu_data() do { } while (0)
 252 #endif /* CONFIG_SMP */
 253
 254 /**
 255  * find_memory - setup memory map
 256  *
 257  * Walk the EFI memory map and find usable memory for the system, taking
 258  * into account reserved areas.
 259  */
 260 void __init
 261 find_memory (void)
 262 {
 263         unsigned long bootmap_size;
 264
 265         reserve_memory();
 266
 267         /* first find highest page frame number */
 268         min_low_pfn = ~0UL;
 269         max_low_pfn = 0;
 270         efi_memmap_walk(find_max_min_low_pfn, NULL);
 271         max_pfn = max_low_pfn;
 272         /* how many bytes to cover all the pages */
 273         bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT;
 274
 275         /* look for a location to hold the bootmap */
 276         bootmap_start = ~0UL;
 277         efi_memmap_walk(find_bootmap_location, &bootmap_size);
 278         if (bootmap_start == ~0UL)
 279                 panic("Cannot find %ld bytes for bootmap\n", bootmap_size);
 280
 281         bootmap_size = init_bootmem_node(NODE_DATA(0),
 282                         (bootmap_start >> PAGE_SHIFT), 0, max_pfn);
 283
 284         /* Free all available memory, then mark bootmem-map as being in use. */
 285         efi_memmap_walk(filter_rsvd_memory, free_bootmem);
 286         reserve_bootmem(bootmap_start, bootmap_size, BOOTMEM_DEFAULT);
 287
 288         find_initrd();
 289
 290         alloc_per_cpu_data();
 291 }
 292
 293 static int count_pages(u64 start, u64 end, void *arg)
 294 {
 295         unsigned long *count = arg;
 296
 297         *count += (end - start) >> PAGE_SHIFT;
 298         return 0;
 299 }
 300
 301 /*
 302  * Set up the page tables.
 303  */
 304
 305 void __init
 306 paging_init (void)
 307 {
 308         unsigned long max_dma;
 309         unsigned long max_zone_pfns[MAX_NR_ZONES];
 310
 311         num_physpages = 0;
 312         efi_memmap_walk(count_pages, &num_physpages);
 313
 314         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 315 #ifdef CONFIG_ZONE_DMA
 316         max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 317         max_zone_pfns[ZONE_DMA] = max_dma;
 318 #endif
 319         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 320
 321 #ifdef CONFIG_VIRTUAL_MEM_MAP
 322         efi_memmap_walk(filter_memory, register_active_ranges);
 323         efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
 324         if (max_gap < LARGE_GAP) {
 325                 vmem_map = (struct page *) 0;
 326                 free_area_init_nodes(max_zone_pfns);
 327         } else {
 328                 unsigned long map_size;
 329
 330                 /* allocate virtual_mem_map */
 331
 332                 map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) *
 333                         sizeof(struct page));
 334                 VMALLOC_END -= map_size;
 335                 vmem_map = (struct page *) VMALLOC_END;
 336                 efi_memmap_walk(create_mem_map_page_table, NULL);
 337
 338                 /*
 339                  * alloc_node_mem_map makes an adjustment for mem_map
 340                  * which isn't compatible with vmem_map.
 341                  */
 342                 NODE_DATA(0)->node_mem_map = vmem_map +
 343                         find_min_pfn_with_active_regions();
 344                 free_area_init_nodes(max_zone_pfns);
 345
 346                 printk("Virtual mem_map starts at 0x%p\n", mem_map);
 347         }
 348 #else /* !CONFIG_VIRTUAL_MEM_MAP */
 349         add_active_range(0, 0, max_low_pfn);
 350         free_area_init_nodes(max_zone_pfns);
 351 #endif /* !CONFIG_VIRTUAL_MEM_MAP */
 352         zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
 353 }