xref: /openbmc/linux/arch/ia64/mm/contig.c (revision 11788d9b)
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/sections.h>
25 #include <asm/mca.h>
26 
27 #ifdef CONFIG_VIRTUAL_MEM_MAP
28 static unsigned long max_gap;
29 #endif
30 
31 /* physical address where the bootmem map is located */
32 unsigned long bootmap_start;
33 
34 #ifdef CONFIG_SMP
35 static void *cpu_data;
36 /**
37  * per_cpu_init - setup per-cpu variables
38  *
39  * Allocate and setup per-cpu data areas.
40  */
41 void *per_cpu_init(void)
42 {
43 	static bool first_time = true;
44 	void *cpu0_data = __cpu0_per_cpu;
45 	unsigned int cpu;
46 
47 	if (!first_time)
48 		goto skip;
49 	first_time = false;
50 
51 	/*
52 	 * get_free_pages() cannot be used before cpu_init() done.
53 	 * BSP allocates PERCPU_PAGE_SIZE bytes for all possible CPUs
54 	 * to avoid that AP calls get_zeroed_page().
55 	 */
56 	for_each_possible_cpu(cpu) {
57 		void *src = cpu == 0 ? cpu0_data : __phys_per_cpu_start;
58 
59 		memcpy(cpu_data, src, __per_cpu_end - __per_cpu_start);
60 		__per_cpu_offset[cpu] = (char *)cpu_data - __per_cpu_start;
61 		per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
62 
63 		/*
64 		 * percpu area for cpu0 is moved from the __init area
65 		 * which is setup by head.S and used till this point.
66 		 * Update ar.k3.  This move is ensures that percpu
67 		 * area for cpu0 is on the correct node and its
68 		 * virtual address isn't insanely far from other
69 		 * percpu areas which is important for congruent
70 		 * percpu allocator.
71 		 */
72 		if (cpu == 0)
73 			ia64_set_kr(IA64_KR_PER_CPU_DATA, __pa(cpu_data) -
74 				    (unsigned long)__per_cpu_start);
75 
76 		cpu_data += PERCPU_PAGE_SIZE;
77 	}
78 skip:
79 	return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
80 }
81 
82 static inline void
83 alloc_per_cpu_data(void)
84 {
85 	size_t size = PERCPU_PAGE_SIZE * num_possible_cpus();
86 
87 	cpu_data = memblock_alloc_from(size, PERCPU_PAGE_SIZE,
88 				       __pa(MAX_DMA_ADDRESS));
89 	if (!cpu_data)
90 		panic("%s: Failed to allocate %lu bytes align=%lx from=%lx\n",
91 		      __func__, size, PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
92 }
93 
94 /**
95  * setup_per_cpu_areas - setup percpu areas
96  *
97  * Arch code has already allocated and initialized percpu areas.  All
98  * this function has to do is to teach the determined layout to the
99  * dynamic percpu allocator, which happens to be more complex than
100  * creating whole new ones using helpers.
101  */
102 void __init
103 setup_per_cpu_areas(void)
104 {
105 	struct pcpu_alloc_info *ai;
106 	struct pcpu_group_info *gi;
107 	unsigned int cpu;
108 	ssize_t static_size, reserved_size, dyn_size;
109 
110 	ai = pcpu_alloc_alloc_info(1, num_possible_cpus());
111 	if (!ai)
112 		panic("failed to allocate pcpu_alloc_info");
113 	gi = &ai->groups[0];
114 
115 	/* units are assigned consecutively to possible cpus */
116 	for_each_possible_cpu(cpu)
117 		gi->cpu_map[gi->nr_units++] = cpu;
118 
119 	/* set parameters */
120 	static_size = __per_cpu_end - __per_cpu_start;
121 	reserved_size = PERCPU_MODULE_RESERVE;
122 	dyn_size = PERCPU_PAGE_SIZE - static_size - reserved_size;
123 	if (dyn_size < 0)
124 		panic("percpu area overflow static=%zd reserved=%zd\n",
125 		      static_size, reserved_size);
126 
127 	ai->static_size		= static_size;
128 	ai->reserved_size	= reserved_size;
129 	ai->dyn_size		= dyn_size;
130 	ai->unit_size		= PERCPU_PAGE_SIZE;
131 	ai->atom_size		= PAGE_SIZE;
132 	ai->alloc_size		= PERCPU_PAGE_SIZE;
133 
134 	pcpu_setup_first_chunk(ai, __per_cpu_start + __per_cpu_offset[0]);
135 	pcpu_free_alloc_info(ai);
136 }
137 #else
138 #define alloc_per_cpu_data() do { } while (0)
139 #endif /* CONFIG_SMP */
140 
141 /**
142  * find_memory - setup memory map
143  *
144  * Walk the EFI memory map and find usable memory for the system, taking
145  * into account reserved areas.
146  */
147 void __init
148 find_memory (void)
149 {
150 	reserve_memory();
151 
152 	/* first find highest page frame number */
153 	min_low_pfn = ~0UL;
154 	max_low_pfn = 0;
155 	efi_memmap_walk(find_max_min_low_pfn, NULL);
156 	max_pfn = max_low_pfn;
157 
158 #ifdef CONFIG_VIRTUAL_MEM_MAP
159 	efi_memmap_walk(filter_memory, register_active_ranges);
160 #else
161 	memblock_add_node(0, PFN_PHYS(max_low_pfn), 0);
162 #endif
163 
164 	find_initrd();
165 
166 	alloc_per_cpu_data();
167 }
168 
169 /*
170  * Set up the page tables.
171  */
172 
173 void __init
174 paging_init (void)
175 {
176 	unsigned long max_dma;
177 	unsigned long max_zone_pfns[MAX_NR_ZONES];
178 
179 	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
180 #ifdef CONFIG_ZONE_DMA32
181 	max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
182 	max_zone_pfns[ZONE_DMA32] = max_dma;
183 #endif
184 	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
185 
186 #ifdef CONFIG_VIRTUAL_MEM_MAP
187 	efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
188 	if (max_gap < LARGE_GAP) {
189 		vmem_map = (struct page *) 0;
190 	} else {
191 		unsigned long map_size;
192 
193 		/* allocate virtual_mem_map */
194 
195 		map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) *
196 			sizeof(struct page));
197 		VMALLOC_END -= map_size;
198 		vmem_map = (struct page *) VMALLOC_END;
199 		efi_memmap_walk(create_mem_map_page_table, NULL);
200 
201 		/*
202 		 * alloc_node_mem_map makes an adjustment for mem_map
203 		 * which isn't compatible with vmem_map.
204 		 */
205 		NODE_DATA(0)->node_mem_map = vmem_map +
206 			find_min_pfn_with_active_regions();
207 
208 		printk("Virtual mem_map starts at 0x%p\n", mem_map);
209 	}
210 #endif /* !CONFIG_VIRTUAL_MEM_MAP */
211 	free_area_init(max_zone_pfns);
212 	zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
213 }
214