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/memblock.h>
  20 #include <linux/mm.h>
  21 #include <linux/nmi.h>
  22 #include <linux/swap.h>
  23
  24 #include <asm/meminit.h>
  25 #include <asm/pgalloc.h>
  26 #include <asm/pgtable.h>
  27 #include <asm/sections.h>
  28 #include <asm/mca.h>
  29
  30 #ifdef CONFIG_VIRTUAL_MEM_MAP
  31 static unsigned long max_gap;
  32 #endif
  33
  34 /* physical address where the bootmem map is located */
  35 unsigned long bootmap_start;
  36
  37 /**
  38  * find_bootmap_location - callback to find a memory area for the bootmap
  39  * @start: start of region
  40  * @end: end of region
  41  * @arg: unused callback data
  42  *
  43  * Find a place to put the bootmap and return its starting address in
  44  * bootmap_start.  This address must be page-aligned.
  45  */
  46 static int __init
  47 find_bootmap_location (u64 start, u64 end, void *arg)
  48 {
  49         u64 needed = *(unsigned long *)arg;
  50         u64 range_start, range_end, free_start;
  51         int i;
  52
  53 #if IGNORE_PFN0
  54         if (start == PAGE_OFFSET) {
  55                 start += PAGE_SIZE;
  56                 if (start >= end)
  57                         return 0;
  58         }
  59 #endif
  60
  61         free_start = PAGE_OFFSET;
  62
  63         for (i = 0; i < num_rsvd_regions; i++) {
  64                 range_start = max(start, free_start);
  65                 range_end   = min(end, rsvd_region[i].start & PAGE_MASK);
  66
  67                 free_start = PAGE_ALIGN(rsvd_region[i].end);
  68
  69                 if (range_end <= range_start)
  70                         continue; /* skip over empty range */
  71
  72                 if (range_end - range_start >= needed) {
  73                         bootmap_start = __pa(range_start);
  74                         return -1;      /* done */
  75                 }
  76
  77                 /* nothing more available in this segment */
  78                 if (range_end == end)
  79                         return 0;
  80         }
  81         return 0;
  82 }
  83
  84 #ifdef CONFIG_SMP
  85 static void *cpu_data;
  86 /**
  87  * per_cpu_init - setup per-cpu variables
  88  *
  89  * Allocate and setup per-cpu data areas.
  90  */
  91 void *per_cpu_init(void)
  92 {
  93         static bool first_time = true;
  94         void *cpu0_data = __cpu0_per_cpu;
  95         unsigned int cpu;
  96
  97         if (!first_time)
  98                 goto skip;
  99         first_time = false;
 100
 101         /*
 102          * get_free_pages() cannot be used before cpu_init() done.
 103          * BSP allocates PERCPU_PAGE_SIZE bytes for all possible CPUs
 104          * to avoid that AP calls get_zeroed_page().
 105          */
 106         for_each_possible_cpu(cpu) {
 107                 void *src = cpu == 0 ? cpu0_data : __phys_per_cpu_start;
 108
 109                 memcpy(cpu_data, src, __per_cpu_end - __per_cpu_start);
 110                 __per_cpu_offset[cpu] = (char *)cpu_data - __per_cpu_start;
 111                 per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
 112
 113                 /*
 114                  * percpu area for cpu0 is moved from the __init area
 115                  * which is setup by head.S and used till this point.
 116                  * Update ar.k3.  This move is ensures that percpu
 117                  * area for cpu0 is on the correct node and its
 118                  * virtual address isn't insanely far from other
 119                  * percpu areas which is important for congruent
 120                  * percpu allocator.
 121                  */
 122                 if (cpu == 0)
 123                         ia64_set_kr(IA64_KR_PER_CPU_DATA, __pa(cpu_data) -
 124                                     (unsigned long)__per_cpu_start);
 125
 126                 cpu_data += PERCPU_PAGE_SIZE;
 127         }
 128 skip:
 129         return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
 130 }
 131
 132 static inline void
 133 alloc_per_cpu_data(void)
 134 {
 135         cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * num_possible_cpus(),
 136                                    PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
 137 }
 138
 139 /**
 140  * setup_per_cpu_areas - setup percpu areas
 141  *
 142  * Arch code has already allocated and initialized percpu areas.  All
 143  * this function has to do is to teach the determined layout to the
 144  * dynamic percpu allocator, which happens to be more complex than
 145  * creating whole new ones using helpers.
 146  */
 147 void __init
 148 setup_per_cpu_areas(void)
 149 {
 150         struct pcpu_alloc_info *ai;
 151         struct pcpu_group_info *gi;
 152         unsigned int cpu;
 153         ssize_t static_size, reserved_size, dyn_size;
 154         int rc;
 155
 156         ai = pcpu_alloc_alloc_info(1, num_possible_cpus());
 157         if (!ai)
 158                 panic("failed to allocate pcpu_alloc_info");
 159         gi = &ai->groups[0];
 160
 161         /* units are assigned consecutively to possible cpus */
 162         for_each_possible_cpu(cpu)
 163                 gi->cpu_map[gi->nr_units++] = cpu;
 164
 165         /* set parameters */
 166         static_size = __per_cpu_end - __per_cpu_start;
 167         reserved_size = PERCPU_MODULE_RESERVE;
 168         dyn_size = PERCPU_PAGE_SIZE - static_size - reserved_size;
 169         if (dyn_size < 0)
 170                 panic("percpu area overflow static=%zd reserved=%zd\n",
 171                       static_size, reserved_size);
 172
 173         ai->static_size         = static_size;
 174         ai->reserved_size       = reserved_size;
 175         ai->dyn_size            = dyn_size;
 176         ai->unit_size           = PERCPU_PAGE_SIZE;
 177         ai->atom_size           = PAGE_SIZE;
 178         ai->alloc_size          = PERCPU_PAGE_SIZE;
 179
 180         rc = pcpu_setup_first_chunk(ai, __per_cpu_start + __per_cpu_offset[0]);
 181         if (rc)
 182                 panic("failed to setup percpu area (err=%d)", rc);
 183
 184         pcpu_free_alloc_info(ai);
 185 }
 186 #else
 187 #define alloc_per_cpu_data() do { } while (0)
 188 #endif /* CONFIG_SMP */
 189
 190 /**
 191  * find_memory - setup memory map
 192  *
 193  * Walk the EFI memory map and find usable memory for the system, taking
 194  * into account reserved areas.
 195  */
 196 void __init
 197 find_memory (void)
 198 {
 199         unsigned long bootmap_size;
 200
 201         reserve_memory();
 202
 203         /* first find highest page frame number */
 204         min_low_pfn = ~0UL;
 205         max_low_pfn = 0;
 206         efi_memmap_walk(find_max_min_low_pfn, NULL);
 207         max_pfn = max_low_pfn;
 208         /* how many bytes to cover all the pages */
 209         bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT;
 210
 211         /* look for a location to hold the bootmap */
 212         bootmap_start = ~0UL;
 213         efi_memmap_walk(find_bootmap_location, &bootmap_size);
 214         if (bootmap_start == ~0UL)
 215                 panic("Cannot find %ld bytes for bootmap\n", bootmap_size);
 216
 217         bootmap_size = init_bootmem_node(NODE_DATA(0),
 218                         (bootmap_start >> PAGE_SHIFT), 0, max_pfn);
 219
 220         /* Free all available memory, then mark bootmem-map as being in use. */
 221         efi_memmap_walk(filter_rsvd_memory, free_bootmem);
 222         reserve_bootmem(bootmap_start, bootmap_size, BOOTMEM_DEFAULT);
 223
 224         find_initrd();
 225
 226         alloc_per_cpu_data();
 227 }
 228
 229 /*
 230  * Set up the page tables.
 231  */
 232
 233 void __init
 234 paging_init (void)
 235 {
 236         unsigned long max_dma;
 237         unsigned long max_zone_pfns[MAX_NR_ZONES];
 238
 239         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 240 #ifdef CONFIG_ZONE_DMA
 241         max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 242         max_zone_pfns[ZONE_DMA] = max_dma;
 243 #endif
 244         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 245
 246 #ifdef CONFIG_VIRTUAL_MEM_MAP
 247         efi_memmap_walk(filter_memory, register_active_ranges);
 248         efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
 249         if (max_gap < LARGE_GAP) {
 250                 vmem_map = (struct page *) 0;
 251                 free_area_init_nodes(max_zone_pfns);
 252         } else {
 253                 unsigned long map_size;
 254
 255                 /* allocate virtual_mem_map */
 256
 257                 map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) *
 258                         sizeof(struct page));
 259                 VMALLOC_END -= map_size;
 260                 vmem_map = (struct page *) VMALLOC_END;
 261                 efi_memmap_walk(create_mem_map_page_table, NULL);
 262
 263                 /*
 264                  * alloc_node_mem_map makes an adjustment for mem_map
 265                  * which isn't compatible with vmem_map.
 266                  */
 267                 NODE_DATA(0)->node_mem_map = vmem_map +
 268                         find_min_pfn_with_active_regions();
 269                 free_area_init_nodes(max_zone_pfns);
 270
 271                 printk("Virtual mem_map starts at 0x%p\n", mem_map);
 272         }
 273 #else /* !CONFIG_VIRTUAL_MEM_MAP */
 274         memblock_add_node(0, PFN_PHYS(max_low_pfn), 0);
 275         free_area_init_nodes(max_zone_pfns);
 276 #endif /* !CONFIG_VIRTUAL_MEM_MAP */
 277         zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
 278 }