Merge tag 'for-linus-20190706' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / arch / ia64 / mm / contig.c
blobd29fb6b9fa331030fbdad1247d09cb7e77b2317c
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.
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.
14 * Routines used by ia64 machines with contiguous (or virtually contiguous)
15 * memory.
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>
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>
29 #ifdef CONFIG_VIRTUAL_MEM_MAP
30 static unsigned long max_gap;
31 #endif
33 /* physical address where the bootmem map is located */
34 unsigned long bootmap_start;
36 #ifdef CONFIG_SMP
37 static void *cpu_data;
38 /**
39 * per_cpu_init - setup per-cpu variables
41 * Allocate and setup per-cpu data areas.
43 void *per_cpu_init(void)
45 static bool first_time = true;
46 void *cpu0_data = __cpu0_per_cpu;
47 unsigned int cpu;
49 if (!first_time)
50 goto skip;
51 first_time = false;
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().
58 for_each_possible_cpu(cpu) {
59 void *src = cpu == 0 ? cpu0_data : __phys_per_cpu_start;
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];
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.
74 if (cpu == 0)
75 ia64_set_kr(IA64_KR_PER_CPU_DATA, __pa(cpu_data) -
76 (unsigned long)__per_cpu_start);
78 cpu_data += PERCPU_PAGE_SIZE;
80 skip:
81 return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
84 static inline void
85 alloc_per_cpu_data(void)
87 size_t size = PERCPU_PAGE_SIZE * num_possible_cpus();
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));
96 /**
97 * setup_per_cpu_areas - setup percpu areas
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.
104 void __init
105 setup_per_cpu_areas(void)
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 int rc;
113 ai = pcpu_alloc_alloc_info(1, num_possible_cpus());
114 if (!ai)
115 panic("failed to allocate pcpu_alloc_info");
116 gi = &ai->groups[0];
118 /* units are assigned consecutively to possible cpus */
119 for_each_possible_cpu(cpu)
120 gi->cpu_map[gi->nr_units++] = cpu;
122 /* set parameters */
123 static_size = __per_cpu_end - __per_cpu_start;
124 reserved_size = PERCPU_MODULE_RESERVE;
125 dyn_size = PERCPU_PAGE_SIZE - static_size - reserved_size;
126 if (dyn_size < 0)
127 panic("percpu area overflow static=%zd reserved=%zd\n",
128 static_size, reserved_size);
130 ai->static_size = static_size;
131 ai->reserved_size = reserved_size;
132 ai->dyn_size = dyn_size;
133 ai->unit_size = PERCPU_PAGE_SIZE;
134 ai->atom_size = PAGE_SIZE;
135 ai->alloc_size = PERCPU_PAGE_SIZE;
137 rc = pcpu_setup_first_chunk(ai, __per_cpu_start + __per_cpu_offset[0]);
138 if (rc)
139 panic("failed to setup percpu area (err=%d)", rc);
141 pcpu_free_alloc_info(ai);
143 #else
144 #define alloc_per_cpu_data() do { } while (0)
145 #endif /* CONFIG_SMP */
148 * find_memory - setup memory map
150 * Walk the EFI memory map and find usable memory for the system, taking
151 * into account reserved areas.
153 void __init
154 find_memory (void)
156 reserve_memory();
158 /* first find highest page frame number */
159 min_low_pfn = ~0UL;
160 max_low_pfn = 0;
161 efi_memmap_walk(find_max_min_low_pfn, NULL);
162 max_pfn = max_low_pfn;
164 #ifdef CONFIG_VIRTUAL_MEM_MAP
165 efi_memmap_walk(filter_memory, register_active_ranges);
166 #else
167 memblock_add_node(0, PFN_PHYS(max_low_pfn), 0);
168 #endif
170 find_initrd();
172 alloc_per_cpu_data();
176 * Set up the page tables.
179 void __init
180 paging_init (void)
182 unsigned long max_dma;
183 unsigned long max_zone_pfns[MAX_NR_ZONES];
185 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
186 #ifdef CONFIG_ZONE_DMA32
187 max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
188 max_zone_pfns[ZONE_DMA32] = max_dma;
189 #endif
190 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
192 #ifdef CONFIG_VIRTUAL_MEM_MAP
193 efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
194 if (max_gap < LARGE_GAP) {
195 vmem_map = (struct page *) 0;
196 } else {
197 unsigned long map_size;
199 /* allocate virtual_mem_map */
201 map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) *
202 sizeof(struct page));
203 VMALLOC_END -= map_size;
204 vmem_map = (struct page *) VMALLOC_END;
205 efi_memmap_walk(create_mem_map_page_table, NULL);
208 * alloc_node_mem_map makes an adjustment for mem_map
209 * which isn't compatible with vmem_map.
211 NODE_DATA(0)->node_mem_map = vmem_map +
212 find_min_pfn_with_active_regions();
214 printk("Virtual mem_map starts at 0x%p\n", mem_map);
216 #endif /* !CONFIG_VIRTUAL_MEM_MAP */
217 free_area_init_nodes(max_zone_pfns);
218 zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));