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/efi.h>
  18 #include <linux/memblock.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 /* physical address where the bootmem map is located */
  34 unsigned long bootmap_start;
  35
  36 #ifdef CONFIG_SMP
  37 static void *cpu_data;
  38 /**
  39  * per_cpu_init - setup per-cpu variables
  40  *
  41  * Allocate and setup per-cpu data areas.
  42  */
  43 void *per_cpu_init(void)
  44 {
  45         static bool first_time = true;
  46         void *cpu0_data = __cpu0_per_cpu;
  47         unsigned int cpu;
  48
  49         if (!first_time)
  50                 goto skip;
  51         first_time = false;
  52
  53         /*
  54          * get_free_pages() cannot be used before cpu_init() done.
  55          * BSP allocates PERCPU_PAGE_SIZE bytes for all possible CPUs
  56          * to avoid that AP calls get_zeroed_page().
  57          */
  58         for_each_possible_cpu(cpu) {
  59                 void *src = cpu == 0 ? cpu0_data : __phys_per_cpu_start;
  60
  61                 memcpy(cpu_data, src, __per_cpu_end - __per_cpu_start);
  62                 __per_cpu_offset[cpu] = (char *)cpu_data - __per_cpu_start;
  63                 per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
  64
  65                 /*
  66                  * percpu area for cpu0 is moved from the __init area
  67                  * which is setup by head.S and used till this point.
  68                  * Update ar.k3.  This move is ensures that percpu
  69                  * area for cpu0 is on the correct node and its
  70                  * virtual address isn't insanely far from other
  71                  * percpu areas which is important for congruent
  72                  * percpu allocator.
  73                  */
  74                 if (cpu == 0)
  75                         ia64_set_kr(IA64_KR_PER_CPU_DATA, __pa(cpu_data) -
  76                                     (unsigned long)__per_cpu_start);
  77
  78                 cpu_data += PERCPU_PAGE_SIZE;
  79         }
  80 skip:
  81         return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
  82 }
  83
  84 static inline void
  85 alloc_per_cpu_data(void)
  86 {
  87         size_t size = PERCPU_PAGE_SIZE * num_possible_cpus();
  88
  89         cpu_data = memblock_alloc_from(size, PERCPU_PAGE_SIZE,
  90                                        __pa(MAX_DMA_ADDRESS));
  91         if (!cpu_data)
  92                 panic("%s: Failed to allocate %lu bytes align=%lx from=%lx\n",
  93                       __func__, size, PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
  94 }
  95
  96 /**
  97  * setup_per_cpu_areas - setup percpu areas
  98  *
  99  * Arch code has already allocated and initialized percpu areas.  All
 100  * this function has to do is to teach the determined layout to the
 101  * dynamic percpu allocator, which happens to be more complex than
 102  * creating whole new ones using helpers.
 103  */
 104 void __init
 105 setup_per_cpu_areas(void)
 106 {
 107         struct pcpu_alloc_info *ai;
 108         struct pcpu_group_info *gi;
 109         unsigned int cpu;
 110         ssize_t static_size, reserved_size, dyn_size;
 111
 112         ai = pcpu_alloc_alloc_info(1, num_possible_cpus());
 113         if (!ai)
 114                 panic("failed to allocate pcpu_alloc_info");
 115         gi = &ai->groups[0];
 116
 117         /* units are assigned consecutively to possible cpus */
 118         for_each_possible_cpu(cpu)
 119                 gi->cpu_map[gi->nr_units++] = cpu;
 120
 121         /* set parameters */
 122         static_size = __per_cpu_end - __per_cpu_start;
 123         reserved_size = PERCPU_MODULE_RESERVE;
 124         dyn_size = PERCPU_PAGE_SIZE - static_size - reserved_size;
 125         if (dyn_size < 0)
 126                 panic("percpu area overflow static=%zd reserved=%zd\n",
 127                       static_size, reserved_size);
 128
 129         ai->static_size         = static_size;
 130         ai->reserved_size       = reserved_size;
 131         ai->dyn_size            = dyn_size;
 132         ai->unit_size           = PERCPU_PAGE_SIZE;
 133         ai->atom_size           = PAGE_SIZE;
 134         ai->alloc_size          = PERCPU_PAGE_SIZE;
 135
 136         pcpu_setup_first_chunk(ai, __per_cpu_start + __per_cpu_offset[0]);
 137         pcpu_free_alloc_info(ai);
 138 }
 139 #else
 140 #define alloc_per_cpu_data() do { } while (0)
 141 #endif /* CONFIG_SMP */
 142
 143 /**
 144  * find_memory - setup memory map
 145  *
 146  * Walk the EFI memory map and find usable memory for the system, taking
 147  * into account reserved areas.
 148  */
 149 void __init
 150 find_memory (void)
 151 {
 152         reserve_memory();
 153
 154         /* first find highest page frame number */
 155         min_low_pfn = ~0UL;
 156         max_low_pfn = 0;
 157         efi_memmap_walk(find_max_min_low_pfn, NULL);
 158         max_pfn = max_low_pfn;
 159
 160 #ifdef CONFIG_VIRTUAL_MEM_MAP
 161         efi_memmap_walk(filter_memory, register_active_ranges);
 162 #else
 163         memblock_add_node(0, PFN_PHYS(max_low_pfn), 0);
 164 #endif
 165
 166         find_initrd();
 167
 168         alloc_per_cpu_data();
 169 }
 170
 171 /*
 172  * Set up the page tables.
 173  */
 174
 175 void __init
 176 paging_init (void)
 177 {
 178         unsigned long max_dma;
 179         unsigned long max_zone_pfns[MAX_NR_ZONES];
 180
 181         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 182 #ifdef CONFIG_ZONE_DMA32
 183         max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 184         max_zone_pfns[ZONE_DMA32] = max_dma;
 185 #endif
 186         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 187
 188 #ifdef CONFIG_VIRTUAL_MEM_MAP
 189         efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
 190         if (max_gap < LARGE_GAP) {
 191                 vmem_map = (struct page *) 0;
 192         } else {
 193                 unsigned long map_size;
 194
 195                 /* allocate virtual_mem_map */
 196
 197                 map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) *
 198                         sizeof(struct page));
 199                 VMALLOC_END -= map_size;
 200                 vmem_map = (struct page *) VMALLOC_END;
 201                 efi_memmap_walk(create_mem_map_page_table, NULL);
 202
 203                 /*
 204                  * alloc_node_mem_map makes an adjustment for mem_map
 205                  * which isn't compatible with vmem_map.
 206                  */
 207                 NODE_DATA(0)->node_mem_map = vmem_map +
 208                         find_min_pfn_with_active_regions();
 209
 210                 printk("Virtual mem_map starts at 0x%p\n", mem_map);
 211         }
 212 #endif /* !CONFIG_VIRTUAL_MEM_MAP */
 213         free_area_init_nodes(max_zone_pfns);
 214         zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
 215 }