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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
40685236 JP |
2 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
3 | ||
4fe29a85 | 4 | #include <linux/kernel.h> |
523d0fb4 | 5 | #include <linux/export.h> |
4fe29a85 | 6 | #include <linux/init.h> |
2013288f | 7 | #include <linux/memblock.h> |
4fe29a85 | 8 | #include <linux/percpu.h> |
1ecd2765 | 9 | #include <linux/kexec.h> |
17b4cceb | 10 | #include <linux/crash_dump.h> |
8a87dd9a JSR |
11 | #include <linux/smp.h> |
12 | #include <linux/topology.h> | |
5f5d8405 | 13 | #include <linux/pfn.h> |
4fe29a85 GOC |
14 | #include <asm/sections.h> |
15 | #include <asm/processor.h> | |
523d0fb4 | 16 | #include <asm/desc.h> |
4fe29a85 | 17 | #include <asm/setup.h> |
0fc0906e | 18 | #include <asm/mpspec.h> |
76eb4131 | 19 | #include <asm/apicdef.h> |
1ecd2765 | 20 | #include <asm/highmem.h> |
1a51e3a0 | 21 | #include <asm/proto.h> |
06879033 | 22 | #include <asm/cpumask.h> |
34019be1 | 23 | #include <asm/cpu.h> |
60a5317f | 24 | #include <asm/stackprotector.h> |
76eb4131 | 25 | |
0816b0f0 | 26 | DEFINE_PER_CPU_READ_MOSTLY(int, cpu_number); |
ea927906 | 27 | EXPORT_PER_CPU_SYMBOL(cpu_number); |
ea927906 | 28 | |
1688401a BG |
29 | #ifdef CONFIG_X86_64 |
30 | #define BOOT_PERCPU_OFFSET ((unsigned long)__per_cpu_load) | |
31 | #else | |
32 | #define BOOT_PERCPU_OFFSET 0 | |
33 | #endif | |
34 | ||
2c773dd3 | 35 | DEFINE_PER_CPU_READ_MOSTLY(unsigned long, this_cpu_off) = BOOT_PERCPU_OFFSET; |
1688401a BG |
36 | EXPORT_PER_CPU_SYMBOL(this_cpu_off); |
37 | ||
404f6aac | 38 | unsigned long __per_cpu_offset[NR_CPUS] __ro_after_init = { |
34019be1 | 39 | [0 ... NR_CPUS-1] = BOOT_PERCPU_OFFSET, |
9939ddaf | 40 | }; |
9939ddaf | 41 | EXPORT_SYMBOL(__per_cpu_offset); |
4fe29a85 | 42 | |
6b19b0c2 TH |
43 | /* |
44 | * On x86_64 symbols referenced from code should be reachable using | |
45 | * 32bit relocations. Reserve space for static percpu variables in | |
46 | * modules so that they are always served from the first chunk which | |
47 | * is located at the percpu segment base. On x86_32, anything can | |
48 | * address anywhere. No need to reserve space in the first chunk. | |
49 | */ | |
50 | #ifdef CONFIG_X86_64 | |
51 | #define PERCPU_FIRST_CHUNK_RESERVE PERCPU_MODULE_RESERVE | |
52 | #else | |
53 | #define PERCPU_FIRST_CHUNK_RESERVE 0 | |
54 | #endif | |
55 | ||
4518e6a0 | 56 | #ifdef CONFIG_X86_32 |
89c92151 TH |
57 | /** |
58 | * pcpu_need_numa - determine percpu allocation needs to consider NUMA | |
59 | * | |
60 | * If NUMA is not configured or there is only one NUMA node available, | |
61 | * there is no reason to consider NUMA. This function determines | |
62 | * whether percpu allocation should consider NUMA or not. | |
63 | * | |
64 | * RETURNS: | |
65 | * true if NUMA should be considered; otherwise, false. | |
66 | */ | |
67 | static bool __init pcpu_need_numa(void) | |
68 | { | |
a9ee6cf5 | 69 | #ifdef CONFIG_NUMA |
89c92151 TH |
70 | pg_data_t *last = NULL; |
71 | unsigned int cpu; | |
72 | ||
73 | for_each_possible_cpu(cpu) { | |
74 | int node = early_cpu_to_node(cpu); | |
75 | ||
76 | if (node_online(node) && NODE_DATA(node) && | |
77 | last && last != NODE_DATA(node)) | |
78 | return true; | |
79 | ||
80 | last = NODE_DATA(node); | |
81 | } | |
82 | #endif | |
83 | return false; | |
84 | } | |
4518e6a0 | 85 | #endif |
89c92151 | 86 | |
5f5d8405 TH |
87 | /** |
88 | * pcpu_alloc_bootmem - NUMA friendly alloc_bootmem wrapper for percpu | |
89 | * @cpu: cpu to allocate for | |
90 | * @size: size allocation in bytes | |
91 | * @align: alignment | |
92 | * | |
93 | * Allocate @size bytes aligned at @align for cpu @cpu. This wrapper | |
94 | * does the right thing for NUMA regardless of the current | |
95 | * configuration. | |
96 | * | |
97 | * RETURNS: | |
98 | * Pointer to the allocated area on success, NULL on failure. | |
99 | */ | |
100 | static void * __init pcpu_alloc_bootmem(unsigned int cpu, unsigned long size, | |
101 | unsigned long align) | |
102 | { | |
103 | const unsigned long goal = __pa(MAX_DMA_ADDRESS); | |
a9ee6cf5 | 104 | #ifdef CONFIG_NUMA |
5f5d8405 TH |
105 | int node = early_cpu_to_node(cpu); |
106 | void *ptr; | |
107 | ||
108 | if (!node_online(node) || !NODE_DATA(node)) { | |
26fb3dae | 109 | ptr = memblock_alloc_from(size, align, goal); |
5f5d8405 TH |
110 | pr_info("cpu %d has no node %d or node-local memory\n", |
111 | cpu, node); | |
112 | pr_debug("per cpu data for cpu%d %lu bytes at %016lx\n", | |
113 | cpu, size, __pa(ptr)); | |
114 | } else { | |
26fb3dae MR |
115 | ptr = memblock_alloc_try_nid(size, align, goal, |
116 | MEMBLOCK_ALLOC_ACCESSIBLE, | |
117 | node); | |
bf2886ef | 118 | |
40685236 JP |
119 | pr_debug("per cpu data for cpu%d %lu bytes on node%d at %016lx\n", |
120 | cpu, size, node, __pa(ptr)); | |
5f5d8405 TH |
121 | } |
122 | return ptr; | |
123 | #else | |
26fb3dae | 124 | return memblock_alloc_from(size, align, goal); |
5f5d8405 TH |
125 | #endif |
126 | } | |
127 | ||
d4b95f80 TH |
128 | /* |
129 | * Helpers for first chunk memory allocation | |
130 | */ | |
3cbc8565 | 131 | static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align) |
d4b95f80 | 132 | { |
3cbc8565 | 133 | return pcpu_alloc_bootmem(cpu, size, align); |
d4b95f80 TH |
134 | } |
135 | ||
136 | static void __init pcpu_fc_free(void *ptr, size_t size) | |
137 | { | |
77e02cf5 | 138 | memblock_free_ptr(ptr, size); |
d4b95f80 TH |
139 | } |
140 | ||
4518e6a0 | 141 | static int __init pcpu_cpu_distance(unsigned int from, unsigned int to) |
a530b795 | 142 | { |
a9ee6cf5 | 143 | #ifdef CONFIG_NUMA |
a530b795 TH |
144 | if (early_cpu_to_node(from) == early_cpu_to_node(to)) |
145 | return LOCAL_DISTANCE; | |
146 | else | |
147 | return REMOTE_DISTANCE; | |
8ac83757 | 148 | #else |
4518e6a0 | 149 | return LOCAL_DISTANCE; |
8ac83757 | 150 | #endif |
89c92151 TH |
151 | } |
152 | ||
00ae4064 | 153 | static void __init pcpup_populate_pte(unsigned long addr) |
458a3e64 TH |
154 | { |
155 | populate_extra_pte(addr); | |
156 | } | |
157 | ||
b2d2f431 BG |
158 | static inline void setup_percpu_segment(int cpu) |
159 | { | |
160 | #ifdef CONFIG_X86_32 | |
1dd439fe TG |
161 | struct desc_struct d = GDT_ENTRY_INIT(0x8092, per_cpu_offset(cpu), |
162 | 0xFFFFF); | |
b2d2f431 | 163 | |
1dd439fe | 164 | write_gdt_entry(get_cpu_gdt_rw(cpu), GDT_ENTRY_PERCPU, &d, DESCTYPE_S); |
b2d2f431 BG |
165 | #endif |
166 | } | |
167 | ||
4fe29a85 GOC |
168 | void __init setup_per_cpu_areas(void) |
169 | { | |
5f5d8405 | 170 | unsigned int cpu; |
11124411 | 171 | unsigned long delta; |
fb435d52 | 172 | int rc; |
a1681965 | 173 | |
b9726c26 | 174 | pr_info("NR_CPUS:%d nr_cpumask_bits:%d nr_cpu_ids:%u nr_node_ids:%u\n", |
a1681965 | 175 | NR_CPUS, nr_cpumask_bits, nr_cpu_ids, nr_node_ids); |
11124411 | 176 | |
8ac83757 | 177 | /* |
4518e6a0 TH |
178 | * Allocate percpu area. Embedding allocator is our favorite; |
179 | * however, on NUMA configurations, it can result in very | |
180 | * sparse unit mapping and vmalloc area isn't spacious enough | |
181 | * on 32bit. Use page in that case. | |
8ac83757 | 182 | */ |
4518e6a0 TH |
183 | #ifdef CONFIG_X86_32 |
184 | if (pcpu_chosen_fc == PCPU_FC_AUTO && pcpu_need_numa()) | |
185 | pcpu_chosen_fc = PCPU_FC_PAGE; | |
186 | #endif | |
fb435d52 | 187 | rc = -EINVAL; |
4518e6a0 | 188 | if (pcpu_chosen_fc != PCPU_FC_PAGE) { |
4518e6a0 TH |
189 | const size_t dyn_size = PERCPU_MODULE_RESERVE + |
190 | PERCPU_DYNAMIC_RESERVE - PERCPU_FIRST_CHUNK_RESERVE; | |
d5e28005 TH |
191 | size_t atom_size; |
192 | ||
193 | /* | |
194 | * On 64bit, use PMD_SIZE for atom_size so that embedded | |
195 | * percpu areas are aligned to PMD. This, in the future, | |
196 | * can also allow using PMD mappings in vmalloc area. Use | |
197 | * PAGE_SIZE on 32bit as vmalloc space is highly contended | |
198 | * and large vmalloc area allocs can easily fail. | |
199 | */ | |
200 | #ifdef CONFIG_X86_64 | |
201 | atom_size = PMD_SIZE; | |
202 | #else | |
203 | atom_size = PAGE_SIZE; | |
204 | #endif | |
4518e6a0 TH |
205 | rc = pcpu_embed_first_chunk(PERCPU_FIRST_CHUNK_RESERVE, |
206 | dyn_size, atom_size, | |
207 | pcpu_cpu_distance, | |
208 | pcpu_fc_alloc, pcpu_fc_free); | |
fb435d52 | 209 | if (rc < 0) |
8d3bcc44 KW |
210 | pr_warn("%s allocator failed (%d), falling back to page size\n", |
211 | pcpu_fc_names[pcpu_chosen_fc], rc); | |
fa8a7094 | 212 | } |
fb435d52 | 213 | if (rc < 0) |
4518e6a0 TH |
214 | rc = pcpu_page_first_chunk(PERCPU_FIRST_CHUNK_RESERVE, |
215 | pcpu_fc_alloc, pcpu_fc_free, | |
216 | pcpup_populate_pte); | |
fb435d52 TH |
217 | if (rc < 0) |
218 | panic("cannot initialize percpu area (err=%d)", rc); | |
11124411 | 219 | |
5f5d8405 | 220 | /* alrighty, percpu areas up and running */ |
11124411 TH |
221 | delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start; |
222 | for_each_possible_cpu(cpu) { | |
fb435d52 | 223 | per_cpu_offset(cpu) = delta + pcpu_unit_offsets[cpu]; |
26f80bd6 | 224 | per_cpu(this_cpu_off, cpu) = per_cpu_offset(cpu); |
ea927906 | 225 | per_cpu(cpu_number, cpu) = cpu; |
b2d2f431 | 226 | setup_percpu_segment(cpu); |
0d77e7f0 | 227 | /* |
cf3997f5 TH |
228 | * Copy data used in early init routines from the |
229 | * initial arrays to the per cpu data areas. These | |
230 | * arrays then become expendable and the *_early_ptr's | |
231 | * are zeroed indicating that the static arrays are | |
232 | * gone. | |
0d77e7f0 | 233 | */ |
ec70de8b | 234 | #ifdef CONFIG_X86_LOCAL_APIC |
0d77e7f0 | 235 | per_cpu(x86_cpu_to_apicid, cpu) = |
cf3997f5 | 236 | early_per_cpu_map(x86_cpu_to_apicid, cpu); |
0d77e7f0 | 237 | per_cpu(x86_bios_cpu_apicid, cpu) = |
cf3997f5 | 238 | early_per_cpu_map(x86_bios_cpu_apicid, cpu); |
3e9e57fa VK |
239 | per_cpu(x86_cpu_to_acpiid, cpu) = |
240 | early_per_cpu_map(x86_cpu_to_acpiid, cpu); | |
ec70de8b | 241 | #endif |
4c321ff8 TH |
242 | #ifdef CONFIG_X86_32 |
243 | per_cpu(x86_cpu_to_logical_apicid, cpu) = | |
244 | early_per_cpu_map(x86_cpu_to_logical_apicid, cpu); | |
245 | #endif | |
6470aff6 BG |
246 | #ifdef CONFIG_NUMA |
247 | per_cpu(x86_cpu_to_node_map, cpu) = | |
cf3997f5 | 248 | early_per_cpu_map(x86_cpu_to_node_map, cpu); |
9aebbdb6 | 249 | /* |
a4ce96ac | 250 | * Ensure that the boot cpu numa_node is correct when the boot |
9aebbdb6 YL |
251 | * cpu is on a node that doesn't have memory installed. |
252 | * Also cpu_up() will call cpu_to_node() for APs when | |
253 | * MEMORY_HOTPLUG is defined, before per_cpu(numa_node) is set | |
254 | * up later with c_init aka intel_init/amd_init. | |
255 | * So set them all (boot cpu and all APs). | |
256 | */ | |
257 | set_cpu_numa_node(cpu, early_cpu_to_node(cpu)); | |
6470aff6 | 258 | #endif |
1a51e3a0 | 259 | /* |
c273fb3b | 260 | * Up to this point, the boot CPU has been using .init.data |
2697fbd5 | 261 | * area. Reload any changed state for the boot CPU. |
1a51e3a0 | 262 | */ |
f6e9456c | 263 | if (!cpu) |
552be871 | 264 | switch_to_new_gdt(cpu); |
4fe29a85 GOC |
265 | } |
266 | ||
0d77e7f0 | 267 | /* indicate the early static arrays will soon be gone */ |
22f25138 | 268 | #ifdef CONFIG_X86_LOCAL_APIC |
0d77e7f0 BG |
269 | early_per_cpu_ptr(x86_cpu_to_apicid) = NULL; |
270 | early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL; | |
3e9e57fa | 271 | early_per_cpu_ptr(x86_cpu_to_acpiid) = NULL; |
22f25138 | 272 | #endif |
4c321ff8 TH |
273 | #ifdef CONFIG_X86_32 |
274 | early_per_cpu_ptr(x86_cpu_to_logical_apicid) = NULL; | |
275 | #endif | |
645a7919 | 276 | #ifdef CONFIG_NUMA |
0d77e7f0 BG |
277 | early_per_cpu_ptr(x86_cpu_to_node_map) = NULL; |
278 | #endif | |
9f0e8d04 | 279 | |
9f248bde MT |
280 | /* Setup node to cpumask map */ |
281 | setup_node_to_cpumask_map(); | |
c2d1cec1 MT |
282 | |
283 | /* Setup cpu initialized, callin, callout masks */ | |
284 | setup_cpu_local_masks(); | |
23b2a4dd | 285 | |
23b2a4dd | 286 | /* |
d2b6dc61 AL |
287 | * Sync back kernel address range again. We already did this in |
288 | * setup_arch(), but percpu data also needs to be available in | |
7f0a002b JR |
289 | * the smpboot asm and arch_sync_kernel_mappings() doesn't sync to |
290 | * swapper_pg_dir on 32-bit. The per-cpu mappings need to be available | |
291 | * there too. | |
945fd17a TG |
292 | * |
293 | * FIXME: Can the later sync in setup_cpu_entry_areas() replace | |
294 | * this call? | |
23b2a4dd | 295 | */ |
945fd17a | 296 | sync_initial_page_table(); |
4fe29a85 | 297 | } |