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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 /**
 35  * show_mem - give short summary of memory stats
 36  *
 37  * Shows a simple page count of reserved and used pages in the system.
 38  * For discontig machines, it does this on a per-pgdat basis.
 39  */
 40 void show_mem(unsigned int filter)
 41 {
 42         int i, total_reserved = 0;
 43         int total_shared = 0, total_cached = 0;
 44         unsigned long total_present = 0;
 45         pg_data_t *pgdat;
 46 
 47         printk(KERN_INFO "Mem-info:\n");
 48         show_free_areas(filter);
 49         printk(KERN_INFO "Node memory in pages:\n");
 50         if (filter & SHOW_MEM_FILTER_PAGE_COUNT)
 51                 return;
 52         for_each_online_pgdat(pgdat) {
 53                 unsigned long present;
 54                 unsigned long flags;
 55                 int shared = 0, cached = 0, reserved = 0;
 56                 int nid = pgdat->node_id;
 57 
 58                 if (skip_free_areas_node(filter, nid))
 59                         continue;
 60                 pgdat_resize_lock(pgdat, &flags);
 61                 present = pgdat->node_present_pages;
 62                 for(i = 0; i < pgdat->node_spanned_pages; i++) {
 63                         struct page *page;
 64                         if (unlikely(i % MAX_ORDER_NR_PAGES == 0))
 65                                 touch_nmi_watchdog();
 66                         if (pfn_valid(pgdat->node_start_pfn + i))
 67                                 page = pfn_to_page(pgdat->node_start_pfn + i);
 68                         else {
 69 #ifdef CONFIG_VIRTUAL_MEM_MAP
 70                                 if (max_gap < LARGE_GAP)
 71                                         continue;
 72 #endif
 73                                 i = vmemmap_find_next_valid_pfn(nid, i) - 1;
 74                                 continue;
 75                         }
 76                         if (PageReserved(page))
 77                                 reserved++;
 78                         else if (PageSwapCache(page))
 79                                 cached++;
 80                         else if (page_count(page))
 81                                 shared += page_count(page)-1;
 82                 }
 83                 pgdat_resize_unlock(pgdat, &flags);
 84                 total_present += present;
 85                 total_reserved += reserved;
 86                 total_cached += cached;
 87                 total_shared += shared;
 88                 printk(KERN_INFO "Node %4d:  RAM: %11ld, rsvd: %8d, "
 89                        "shrd: %10d, swpd: %10d\n", nid,
 90                        present, reserved, shared, cached);
 91         }
 92         printk(KERN_INFO "%ld pages of RAM\n", total_present);
 93         printk(KERN_INFO "%d reserved pages\n", total_reserved);
 94         printk(KERN_INFO "%d pages shared\n", total_shared);
 95         printk(KERN_INFO "%d pages swap cached\n", total_cached);
 96         printk(KERN_INFO "Total of %ld pages in page table cache\n",
 97                quicklist_total_size());
 98         printk(KERN_INFO "%ld free buffer pages\n", nr_free_buffer_pages());
 99 }
100 
101 
102 /* physical address where the bootmem map is located */
103 unsigned long bootmap_start;
104 
105 /**
106  * find_bootmap_location - callback to find a memory area for the bootmap
107  * @start: start of region
108  * @end: end of region
109  * @arg: unused callback data
110  *
111  * Find a place to put the bootmap and return its starting address in
112  * bootmap_start.  This address must be page-aligned.
113  */
114 static int __init
115 find_bootmap_location (u64 start, u64 end, void *arg)
116 {
117         u64 needed = *(unsigned long *)arg;
118         u64 range_start, range_end, free_start;
119         int i;
120 
121 #if IGNORE_PFN0
122         if (start == PAGE_OFFSET) {
123                 start += PAGE_SIZE;
124                 if (start >= end)
125                         return 0;
126         }
127 #endif
128 
129         free_start = PAGE_OFFSET;
130 
131         for (i = 0; i < num_rsvd_regions; i++) {
132                 range_start = max(start, free_start);
133                 range_end   = min(end, rsvd_region[i].start & PAGE_MASK);
134 
135                 free_start = PAGE_ALIGN(rsvd_region[i].end);
136 
137                 if (range_end <= range_start)
138                         continue; /* skip over empty range */
139 
140                 if (range_end - range_start >= needed) {
141                         bootmap_start = __pa(range_start);
142                         return -1;      /* done */
143                 }
144 
145                 /* nothing more available in this segment */
146                 if (range_end == end)
147                         return 0;
148         }
149         return 0;
150 }
151 
152 #ifdef CONFIG_SMP
153 static void *cpu_data;
154 /**
155  * per_cpu_init - setup per-cpu variables
156  *
157  * Allocate and setup per-cpu data areas.
158  */
159 void *per_cpu_init(void)
160 {
161         static bool first_time = true;
162         void *cpu0_data = __cpu0_per_cpu;
163         unsigned int cpu;
164 
165         if (!first_time)
166                 goto skip;
167         first_time = false;
168 
169         /*
170          * get_free_pages() cannot be used before cpu_init() done.
171          * BSP allocates PERCPU_PAGE_SIZE bytes for all possible CPUs
172          * to avoid that AP calls get_zeroed_page().
173          */
174         for_each_possible_cpu(cpu) {
175                 void *src = cpu == 0 ? cpu0_data : __phys_per_cpu_start;
176 
177                 memcpy(cpu_data, src, __per_cpu_end - __per_cpu_start);
178                 __per_cpu_offset[cpu] = (char *)cpu_data - __per_cpu_start;
179                 per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
180 
181                 /*
182                  * percpu area for cpu0 is moved from the __init area
183                  * which is setup by head.S and used till this point.
184                  * Update ar.k3.  This move is ensures that percpu
185                  * area for cpu0 is on the correct node and its
186                  * virtual address isn't insanely far from other
187                  * percpu areas which is important for congruent
188                  * percpu allocator.
189                  */
190                 if (cpu == 0)
191                         ia64_set_kr(IA64_KR_PER_CPU_DATA, __pa(cpu_data) -
192                                     (unsigned long)__per_cpu_start);
193 
194                 cpu_data += PERCPU_PAGE_SIZE;
195         }
196 skip:
197         return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
198 }
199 
200 static inline void
201 alloc_per_cpu_data(void)
202 {
203         cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * num_possible_cpus(),
204                                    PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
205 }
206 
207 /**
208  * setup_per_cpu_areas - setup percpu areas
209  *
210  * Arch code has already allocated and initialized percpu areas.  All
211  * this function has to do is to teach the determined layout to the
212  * dynamic percpu allocator, which happens to be more complex than
213  * creating whole new ones using helpers.
214  */
215 void __init
216 setup_per_cpu_areas(void)
217 {
218         struct pcpu_alloc_info *ai;
219         struct pcpu_group_info *gi;
220         unsigned int cpu;
221         ssize_t static_size, reserved_size, dyn_size;
222         int rc;
223 
224         ai = pcpu_alloc_alloc_info(1, num_possible_cpus());
225         if (!ai)
226                 panic("failed to allocate pcpu_alloc_info");
227         gi = &ai->groups[0];
228 
229         /* units are assigned consecutively to possible cpus */
230         for_each_possible_cpu(cpu)
231                 gi->cpu_map[gi->nr_units++] = cpu;
232 
233         /* set parameters */
234         static_size = __per_cpu_end - __per_cpu_start;
235         reserved_size = PERCPU_MODULE_RESERVE;
236         dyn_size = PERCPU_PAGE_SIZE - static_size - reserved_size;
237         if (dyn_size < 0)
238                 panic("percpu area overflow static=%zd reserved=%zd\n",
239                       static_size, reserved_size);
240 
241         ai->static_size         = static_size;
242         ai->reserved_size       = reserved_size;
243         ai->dyn_size            = dyn_size;
244         ai->unit_size           = PERCPU_PAGE_SIZE;
245         ai->atom_size           = PAGE_SIZE;
246         ai->alloc_size          = PERCPU_PAGE_SIZE;
247 
248         rc = pcpu_setup_first_chunk(ai, __per_cpu_start + __per_cpu_offset[0]);
249         if (rc)
250                 panic("failed to setup percpu area (err=%d)", rc);
251 
252         pcpu_free_alloc_info(ai);
253 }
254 #else
255 #define alloc_per_cpu_data() do { } while (0)
256 #endif /* CONFIG_SMP */
257 
258 /**
259  * find_memory - setup memory map
260  *
261  * Walk the EFI memory map and find usable memory for the system, taking
262  * into account reserved areas.
263  */
264 void __init
265 find_memory (void)
266 {
267         unsigned long bootmap_size;
268 
269         reserve_memory();
270 
271         /* first find highest page frame number */
272         min_low_pfn = ~0UL;
273         max_low_pfn = 0;
274         efi_memmap_walk(find_max_min_low_pfn, NULL);
275         max_pfn = max_low_pfn;
276         /* how many bytes to cover all the pages */
277         bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT;
278 
279         /* look for a location to hold the bootmap */
280         bootmap_start = ~0UL;
281         efi_memmap_walk(find_bootmap_location, &bootmap_size);
282         if (bootmap_start == ~0UL)
283                 panic("Cannot find %ld bytes for bootmap\n", bootmap_size);
284 
285         bootmap_size = init_bootmem_node(NODE_DATA(0),
286                         (bootmap_start >> PAGE_SHIFT), 0, max_pfn);
287 
288         /* Free all available memory, then mark bootmem-map as being in use. */
289         efi_memmap_walk(filter_rsvd_memory, free_bootmem);
290         reserve_bootmem(bootmap_start, bootmap_size, BOOTMEM_DEFAULT);
291 
292         find_initrd();
293 
294         alloc_per_cpu_data();
295 }
296 
297 /*
298  * Set up the page tables.
299  */
300 
301 void __init
302 paging_init (void)
303 {
304         unsigned long max_dma;
305         unsigned long max_zone_pfns[MAX_NR_ZONES];
306 
307         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
308 #ifdef CONFIG_ZONE_DMA
309         max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
310         max_zone_pfns[ZONE_DMA] = max_dma;
311 #endif
312         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
313 
314 #ifdef CONFIG_VIRTUAL_MEM_MAP
315         efi_memmap_walk(filter_memory, register_active_ranges);
316         efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
317         if (max_gap < LARGE_GAP) {
318                 vmem_map = (struct page *) 0;
319                 free_area_init_nodes(max_zone_pfns);
320         } else {
321                 unsigned long map_size;
322 
323                 /* allocate virtual_mem_map */
324 
325                 map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) *
326                         sizeof(struct page));
327                 VMALLOC_END -= map_size;
328                 vmem_map = (struct page *) VMALLOC_END;
329                 efi_memmap_walk(create_mem_map_page_table, NULL);
330 
331                 /*
332                  * alloc_node_mem_map makes an adjustment for mem_map
333                  * which isn't compatible with vmem_map.
334                  */
335                 NODE_DATA(0)->node_mem_map = vmem_map +
336                         find_min_pfn_with_active_regions();
337                 free_area_init_nodes(max_zone_pfns);
338 
339                 printk("Virtual mem_map starts at 0x%p\n", mem_map);
340         }
341 #else /* !CONFIG_VIRTUAL_MEM_MAP */
342         memblock_add_node(0, PFN_PHYS(max_low_pfn), 0);
343         free_area_init_nodes(max_zone_pfns);
344 #endif /* !CONFIG_VIRTUAL_MEM_MAP */
345         zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
346 }
347 

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