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Linux/arch/ia64/mm/contig.c

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  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 }
279 

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