Loading...
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
31static 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 */
40void 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 for_each_online_pgdat(pgdat) {
51 unsigned long present;
52 unsigned long flags;
53 int shared = 0, cached = 0, reserved = 0;
54 int nid = pgdat->node_id;
55
56 if (skip_free_areas_node(filter, nid))
57 continue;
58 pgdat_resize_lock(pgdat, &flags);
59 present = pgdat->node_present_pages;
60 for(i = 0; i < pgdat->node_spanned_pages; i++) {
61 struct page *page;
62 if (unlikely(i % MAX_ORDER_NR_PAGES == 0))
63 touch_nmi_watchdog();
64 if (pfn_valid(pgdat->node_start_pfn + i))
65 page = pfn_to_page(pgdat->node_start_pfn + i);
66 else {
67#ifdef CONFIG_VIRTUAL_MEM_MAP
68 if (max_gap < LARGE_GAP)
69 continue;
70#endif
71 i = vmemmap_find_next_valid_pfn(nid, i) - 1;
72 continue;
73 }
74 if (PageReserved(page))
75 reserved++;
76 else if (PageSwapCache(page))
77 cached++;
78 else if (page_count(page))
79 shared += page_count(page)-1;
80 }
81 pgdat_resize_unlock(pgdat, &flags);
82 total_present += present;
83 total_reserved += reserved;
84 total_cached += cached;
85 total_shared += shared;
86 printk(KERN_INFO "Node %4d: RAM: %11ld, rsvd: %8d, "
87 "shrd: %10d, swpd: %10d\n", nid,
88 present, reserved, shared, cached);
89 }
90 printk(KERN_INFO "%ld pages of RAM\n", total_present);
91 printk(KERN_INFO "%d reserved pages\n", total_reserved);
92 printk(KERN_INFO "%d pages shared\n", total_shared);
93 printk(KERN_INFO "%d pages swap cached\n", total_cached);
94 printk(KERN_INFO "Total of %ld pages in page table cache\n",
95 quicklist_total_size());
96 printk(KERN_INFO "%d free buffer pages\n", nr_free_buffer_pages());
97}
98
99
100/* physical address where the bootmem map is located */
101unsigned long bootmap_start;
102
103/**
104 * find_bootmap_location - callback to find a memory area for the bootmap
105 * @start: start of region
106 * @end: end of region
107 * @arg: unused callback data
108 *
109 * Find a place to put the bootmap and return its starting address in
110 * bootmap_start. This address must be page-aligned.
111 */
112static int __init
113find_bootmap_location (u64 start, u64 end, void *arg)
114{
115 u64 needed = *(unsigned long *)arg;
116 u64 range_start, range_end, free_start;
117 int i;
118
119#if IGNORE_PFN0
120 if (start == PAGE_OFFSET) {
121 start += PAGE_SIZE;
122 if (start >= end)
123 return 0;
124 }
125#endif
126
127 free_start = PAGE_OFFSET;
128
129 for (i = 0; i < num_rsvd_regions; i++) {
130 range_start = max(start, free_start);
131 range_end = min(end, rsvd_region[i].start & PAGE_MASK);
132
133 free_start = PAGE_ALIGN(rsvd_region[i].end);
134
135 if (range_end <= range_start)
136 continue; /* skip over empty range */
137
138 if (range_end - range_start >= needed) {
139 bootmap_start = __pa(range_start);
140 return -1; /* done */
141 }
142
143 /* nothing more available in this segment */
144 if (range_end == end)
145 return 0;
146 }
147 return 0;
148}
149
150#ifdef CONFIG_SMP
151static void *cpu_data;
152/**
153 * per_cpu_init - setup per-cpu variables
154 *
155 * Allocate and setup per-cpu data areas.
156 */
157void * __cpuinit
158per_cpu_init (void)
159{
160 static bool first_time = true;
161 void *cpu0_data = __cpu0_per_cpu;
162 unsigned int cpu;
163
164 if (!first_time)
165 goto skip;
166 first_time = false;
167
168 /*
169 * get_free_pages() cannot be used before cpu_init() done.
170 * BSP allocates PERCPU_PAGE_SIZE bytes for all possible CPUs
171 * to avoid that AP calls get_zeroed_page().
172 */
173 for_each_possible_cpu(cpu) {
174 void *src = cpu == 0 ? cpu0_data : __phys_per_cpu_start;
175
176 memcpy(cpu_data, src, __per_cpu_end - __per_cpu_start);
177 __per_cpu_offset[cpu] = (char *)cpu_data - __per_cpu_start;
178 per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
179
180 /*
181 * percpu area for cpu0 is moved from the __init area
182 * which is setup by head.S and used till this point.
183 * Update ar.k3. This move is ensures that percpu
184 * area for cpu0 is on the correct node and its
185 * virtual address isn't insanely far from other
186 * percpu areas which is important for congruent
187 * percpu allocator.
188 */
189 if (cpu == 0)
190 ia64_set_kr(IA64_KR_PER_CPU_DATA, __pa(cpu_data) -
191 (unsigned long)__per_cpu_start);
192
193 cpu_data += PERCPU_PAGE_SIZE;
194 }
195skip:
196 return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
197}
198
199static inline void
200alloc_per_cpu_data(void)
201{
202 cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * num_possible_cpus(),
203 PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
204}
205
206/**
207 * setup_per_cpu_areas - setup percpu areas
208 *
209 * Arch code has already allocated and initialized percpu areas. All
210 * this function has to do is to teach the determined layout to the
211 * dynamic percpu allocator, which happens to be more complex than
212 * creating whole new ones using helpers.
213 */
214void __init
215setup_per_cpu_areas(void)
216{
217 struct pcpu_alloc_info *ai;
218 struct pcpu_group_info *gi;
219 unsigned int cpu;
220 ssize_t static_size, reserved_size, dyn_size;
221 int rc;
222
223 ai = pcpu_alloc_alloc_info(1, num_possible_cpus());
224 if (!ai)
225 panic("failed to allocate pcpu_alloc_info");
226 gi = &ai->groups[0];
227
228 /* units are assigned consecutively to possible cpus */
229 for_each_possible_cpu(cpu)
230 gi->cpu_map[gi->nr_units++] = cpu;
231
232 /* set parameters */
233 static_size = __per_cpu_end - __per_cpu_start;
234 reserved_size = PERCPU_MODULE_RESERVE;
235 dyn_size = PERCPU_PAGE_SIZE - static_size - reserved_size;
236 if (dyn_size < 0)
237 panic("percpu area overflow static=%zd reserved=%zd\n",
238 static_size, reserved_size);
239
240 ai->static_size = static_size;
241 ai->reserved_size = reserved_size;
242 ai->dyn_size = dyn_size;
243 ai->unit_size = PERCPU_PAGE_SIZE;
244 ai->atom_size = PAGE_SIZE;
245 ai->alloc_size = PERCPU_PAGE_SIZE;
246
247 rc = pcpu_setup_first_chunk(ai, __per_cpu_start + __per_cpu_offset[0]);
248 if (rc)
249 panic("failed to setup percpu area (err=%d)", rc);
250
251 pcpu_free_alloc_info(ai);
252}
253#else
254#define alloc_per_cpu_data() do { } while (0)
255#endif /* CONFIG_SMP */
256
257/**
258 * find_memory - setup memory map
259 *
260 * Walk the EFI memory map and find usable memory for the system, taking
261 * into account reserved areas.
262 */
263void __init
264find_memory (void)
265{
266 unsigned long bootmap_size;
267
268 reserve_memory();
269
270 /* first find highest page frame number */
271 min_low_pfn = ~0UL;
272 max_low_pfn = 0;
273 efi_memmap_walk(find_max_min_low_pfn, NULL);
274 max_pfn = max_low_pfn;
275 /* how many bytes to cover all the pages */
276 bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT;
277
278 /* look for a location to hold the bootmap */
279 bootmap_start = ~0UL;
280 efi_memmap_walk(find_bootmap_location, &bootmap_size);
281 if (bootmap_start == ~0UL)
282 panic("Cannot find %ld bytes for bootmap\n", bootmap_size);
283
284 bootmap_size = init_bootmem_node(NODE_DATA(0),
285 (bootmap_start >> PAGE_SHIFT), 0, max_pfn);
286
287 /* Free all available memory, then mark bootmem-map as being in use. */
288 efi_memmap_walk(filter_rsvd_memory, free_bootmem);
289 reserve_bootmem(bootmap_start, bootmap_size, BOOTMEM_DEFAULT);
290
291 find_initrd();
292
293 alloc_per_cpu_data();
294}
295
296static int count_pages(u64 start, u64 end, void *arg)
297{
298 unsigned long *count = arg;
299
300 *count += (end - start) >> PAGE_SHIFT;
301 return 0;
302}
303
304/*
305 * Set up the page tables.
306 */
307
308void __init
309paging_init (void)
310{
311 unsigned long max_dma;
312 unsigned long max_zone_pfns[MAX_NR_ZONES];
313
314 num_physpages = 0;
315 efi_memmap_walk(count_pages, &num_physpages);
316
317 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
318#ifdef CONFIG_ZONE_DMA
319 max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
320 max_zone_pfns[ZONE_DMA] = max_dma;
321#endif
322 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
323
324#ifdef CONFIG_VIRTUAL_MEM_MAP
325 efi_memmap_walk(filter_memory, register_active_ranges);
326 efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
327 if (max_gap < LARGE_GAP) {
328 vmem_map = (struct page *) 0;
329 free_area_init_nodes(max_zone_pfns);
330 } else {
331 unsigned long map_size;
332
333 /* allocate virtual_mem_map */
334
335 map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) *
336 sizeof(struct page));
337 VMALLOC_END -= map_size;
338 vmem_map = (struct page *) VMALLOC_END;
339 efi_memmap_walk(create_mem_map_page_table, NULL);
340
341 /*
342 * alloc_node_mem_map makes an adjustment for mem_map
343 * which isn't compatible with vmem_map.
344 */
345 NODE_DATA(0)->node_mem_map = vmem_map +
346 find_min_pfn_with_active_regions();
347 free_area_init_nodes(max_zone_pfns);
348
349 printk("Virtual mem_map starts at 0x%p\n", mem_map);
350 }
351#else /* !CONFIG_VIRTUAL_MEM_MAP */
352 memblock_add_node(0, PFN_PHYS(max_low_pfn), 0);
353 free_area_init_nodes(max_zone_pfns);
354#endif /* !CONFIG_VIRTUAL_MEM_MAP */
355 zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
356}