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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
8f6aac41 CL |
2 | /* |
3 | * Virtual Memory Map support | |
4 | * | |
cde53535 | 5 | * (C) 2007 sgi. Christoph Lameter. |
8f6aac41 CL |
6 | * |
7 | * Virtual memory maps allow VM primitives pfn_to_page, page_to_pfn, | |
8 | * virt_to_page, page_address() to be implemented as a base offset | |
9 | * calculation without memory access. | |
10 | * | |
11 | * However, virtual mappings need a page table and TLBs. Many Linux | |
12 | * architectures already map their physical space using 1-1 mappings | |
b595076a | 13 | * via TLBs. For those arches the virtual memory map is essentially |
8f6aac41 CL |
14 | * for free if we use the same page size as the 1-1 mappings. In that |
15 | * case the overhead consists of a few additional pages that are | |
16 | * allocated to create a view of memory for vmemmap. | |
17 | * | |
29c71111 AW |
18 | * The architecture is expected to provide a vmemmap_populate() function |
19 | * to instantiate the mapping. | |
8f6aac41 CL |
20 | */ |
21 | #include <linux/mm.h> | |
22 | #include <linux/mmzone.h> | |
23 | #include <linux/bootmem.h> | |
97ad1087 | 24 | #include <linux/memblock.h> |
4b94ffdc | 25 | #include <linux/memremap.h> |
8f6aac41 | 26 | #include <linux/highmem.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
8f6aac41 CL |
28 | #include <linux/spinlock.h> |
29 | #include <linux/vmalloc.h> | |
8bca44bb | 30 | #include <linux/sched.h> |
8f6aac41 CL |
31 | #include <asm/dma.h> |
32 | #include <asm/pgalloc.h> | |
33 | #include <asm/pgtable.h> | |
34 | ||
35 | /* | |
36 | * Allocate a block of memory to be used to back the virtual memory map | |
37 | * or to back the page tables that are used to create the mapping. | |
38 | * Uses the main allocators if they are available, else bootmem. | |
39 | */ | |
e0dc3a53 | 40 | |
bd721ea7 | 41 | static void * __ref __earlyonly_bootmem_alloc(int node, |
e0dc3a53 KH |
42 | unsigned long size, |
43 | unsigned long align, | |
44 | unsigned long goal) | |
45 | { | |
eb31d559 | 46 | return memblock_alloc_try_nid_raw(size, align, goal, |
97ad1087 | 47 | MEMBLOCK_ALLOC_ACCESSIBLE, node); |
e0dc3a53 KH |
48 | } |
49 | ||
8f6aac41 CL |
50 | void * __meminit vmemmap_alloc_block(unsigned long size, int node) |
51 | { | |
52 | /* If the main allocator is up use that, fallback to bootmem. */ | |
53 | if (slab_is_available()) { | |
fcdaf842 MH |
54 | gfp_t gfp_mask = GFP_KERNEL|__GFP_RETRY_MAYFAIL|__GFP_NOWARN; |
55 | int order = get_order(size); | |
56 | static bool warned; | |
f52407ce SL |
57 | struct page *page; |
58 | ||
fcdaf842 | 59 | page = alloc_pages_node(node, gfp_mask, order); |
8f6aac41 CL |
60 | if (page) |
61 | return page_address(page); | |
fcdaf842 MH |
62 | |
63 | if (!warned) { | |
64 | warn_alloc(gfp_mask & ~__GFP_NOWARN, NULL, | |
65 | "vmemmap alloc failure: order:%u", order); | |
66 | warned = true; | |
67 | } | |
8f6aac41 CL |
68 | return NULL; |
69 | } else | |
e0dc3a53 | 70 | return __earlyonly_bootmem_alloc(node, size, size, |
8f6aac41 CL |
71 | __pa(MAX_DMA_ADDRESS)); |
72 | } | |
73 | ||
9bdac914 | 74 | /* need to make sure size is all the same during early stage */ |
a8fc357b | 75 | void * __meminit vmemmap_alloc_block_buf(unsigned long size, int node) |
9bdac914 | 76 | { |
35fd1eb1 | 77 | void *ptr = sparse_buffer_alloc(size); |
9bdac914 | 78 | |
35fd1eb1 PT |
79 | if (!ptr) |
80 | ptr = vmemmap_alloc_block(size, node); | |
9bdac914 YL |
81 | return ptr; |
82 | } | |
83 | ||
4b94ffdc DW |
84 | static unsigned long __meminit vmem_altmap_next_pfn(struct vmem_altmap *altmap) |
85 | { | |
86 | return altmap->base_pfn + altmap->reserve + altmap->alloc | |
87 | + altmap->align; | |
88 | } | |
89 | ||
90 | static unsigned long __meminit vmem_altmap_nr_free(struct vmem_altmap *altmap) | |
91 | { | |
92 | unsigned long allocated = altmap->alloc + altmap->align; | |
93 | ||
94 | if (altmap->free > allocated) | |
95 | return altmap->free - allocated; | |
96 | return 0; | |
97 | } | |
98 | ||
99 | /** | |
eb804533 CH |
100 | * altmap_alloc_block_buf - allocate pages from the device page map |
101 | * @altmap: device page map | |
102 | * @size: size (in bytes) of the allocation | |
4b94ffdc | 103 | * |
eb804533 | 104 | * Allocations are aligned to the size of the request. |
4b94ffdc | 105 | */ |
a8fc357b | 106 | void * __meminit altmap_alloc_block_buf(unsigned long size, |
4b94ffdc DW |
107 | struct vmem_altmap *altmap) |
108 | { | |
eb804533 | 109 | unsigned long pfn, nr_pfns, nr_align; |
4b94ffdc DW |
110 | |
111 | if (size & ~PAGE_MASK) { | |
112 | pr_warn_once("%s: allocations must be multiple of PAGE_SIZE (%ld)\n", | |
113 | __func__, size); | |
114 | return NULL; | |
115 | } | |
116 | ||
eb804533 | 117 | pfn = vmem_altmap_next_pfn(altmap); |
4b94ffdc | 118 | nr_pfns = size >> PAGE_SHIFT; |
eb804533 CH |
119 | nr_align = 1UL << find_first_bit(&nr_pfns, BITS_PER_LONG); |
120 | nr_align = ALIGN(pfn, nr_align) - pfn; | |
121 | if (nr_pfns + nr_align > vmem_altmap_nr_free(altmap)) | |
122 | return NULL; | |
123 | ||
124 | altmap->alloc += nr_pfns; | |
125 | altmap->align += nr_align; | |
126 | pfn += nr_align; | |
127 | ||
4b94ffdc DW |
128 | pr_debug("%s: pfn: %#lx alloc: %ld align: %ld nr: %#lx\n", |
129 | __func__, pfn, altmap->alloc, altmap->align, nr_pfns); | |
eb804533 | 130 | return __va(__pfn_to_phys(pfn)); |
4b94ffdc DW |
131 | } |
132 | ||
8f6aac41 CL |
133 | void __meminit vmemmap_verify(pte_t *pte, int node, |
134 | unsigned long start, unsigned long end) | |
135 | { | |
136 | unsigned long pfn = pte_pfn(*pte); | |
137 | int actual_node = early_pfn_to_nid(pfn); | |
138 | ||
b41ad14c | 139 | if (node_distance(actual_node, node) > LOCAL_DISTANCE) |
1170532b JP |
140 | pr_warn("[%lx-%lx] potential offnode page_structs\n", |
141 | start, end - 1); | |
8f6aac41 CL |
142 | } |
143 | ||
29c71111 | 144 | pte_t * __meminit vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node) |
8f6aac41 | 145 | { |
29c71111 AW |
146 | pte_t *pte = pte_offset_kernel(pmd, addr); |
147 | if (pte_none(*pte)) { | |
148 | pte_t entry; | |
a8fc357b | 149 | void *p = vmemmap_alloc_block_buf(PAGE_SIZE, node); |
29c71111 | 150 | if (!p) |
9dce07f1 | 151 | return NULL; |
29c71111 AW |
152 | entry = pfn_pte(__pa(p) >> PAGE_SHIFT, PAGE_KERNEL); |
153 | set_pte_at(&init_mm, addr, pte, entry); | |
154 | } | |
155 | return pte; | |
8f6aac41 CL |
156 | } |
157 | ||
f7f99100 PT |
158 | static void * __meminit vmemmap_alloc_block_zero(unsigned long size, int node) |
159 | { | |
160 | void *p = vmemmap_alloc_block(size, node); | |
161 | ||
162 | if (!p) | |
163 | return NULL; | |
164 | memset(p, 0, size); | |
165 | ||
166 | return p; | |
167 | } | |
168 | ||
29c71111 | 169 | pmd_t * __meminit vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node) |
8f6aac41 | 170 | { |
29c71111 AW |
171 | pmd_t *pmd = pmd_offset(pud, addr); |
172 | if (pmd_none(*pmd)) { | |
f7f99100 | 173 | void *p = vmemmap_alloc_block_zero(PAGE_SIZE, node); |
29c71111 | 174 | if (!p) |
9dce07f1 | 175 | return NULL; |
29c71111 | 176 | pmd_populate_kernel(&init_mm, pmd, p); |
8f6aac41 | 177 | } |
29c71111 | 178 | return pmd; |
8f6aac41 | 179 | } |
8f6aac41 | 180 | |
c2febafc | 181 | pud_t * __meminit vmemmap_pud_populate(p4d_t *p4d, unsigned long addr, int node) |
8f6aac41 | 182 | { |
c2febafc | 183 | pud_t *pud = pud_offset(p4d, addr); |
29c71111 | 184 | if (pud_none(*pud)) { |
f7f99100 | 185 | void *p = vmemmap_alloc_block_zero(PAGE_SIZE, node); |
29c71111 | 186 | if (!p) |
9dce07f1 | 187 | return NULL; |
29c71111 AW |
188 | pud_populate(&init_mm, pud, p); |
189 | } | |
190 | return pud; | |
191 | } | |
8f6aac41 | 192 | |
c2febafc KS |
193 | p4d_t * __meminit vmemmap_p4d_populate(pgd_t *pgd, unsigned long addr, int node) |
194 | { | |
195 | p4d_t *p4d = p4d_offset(pgd, addr); | |
196 | if (p4d_none(*p4d)) { | |
f7f99100 | 197 | void *p = vmemmap_alloc_block_zero(PAGE_SIZE, node); |
c2febafc KS |
198 | if (!p) |
199 | return NULL; | |
200 | p4d_populate(&init_mm, p4d, p); | |
201 | } | |
202 | return p4d; | |
203 | } | |
204 | ||
29c71111 AW |
205 | pgd_t * __meminit vmemmap_pgd_populate(unsigned long addr, int node) |
206 | { | |
207 | pgd_t *pgd = pgd_offset_k(addr); | |
208 | if (pgd_none(*pgd)) { | |
f7f99100 | 209 | void *p = vmemmap_alloc_block_zero(PAGE_SIZE, node); |
29c71111 | 210 | if (!p) |
9dce07f1 | 211 | return NULL; |
29c71111 | 212 | pgd_populate(&init_mm, pgd, p); |
8f6aac41 | 213 | } |
29c71111 | 214 | return pgd; |
8f6aac41 CL |
215 | } |
216 | ||
0aad818b JW |
217 | int __meminit vmemmap_populate_basepages(unsigned long start, |
218 | unsigned long end, int node) | |
8f6aac41 | 219 | { |
0aad818b | 220 | unsigned long addr = start; |
29c71111 | 221 | pgd_t *pgd; |
c2febafc | 222 | p4d_t *p4d; |
29c71111 AW |
223 | pud_t *pud; |
224 | pmd_t *pmd; | |
225 | pte_t *pte; | |
8f6aac41 | 226 | |
29c71111 AW |
227 | for (; addr < end; addr += PAGE_SIZE) { |
228 | pgd = vmemmap_pgd_populate(addr, node); | |
229 | if (!pgd) | |
230 | return -ENOMEM; | |
c2febafc KS |
231 | p4d = vmemmap_p4d_populate(pgd, addr, node); |
232 | if (!p4d) | |
233 | return -ENOMEM; | |
234 | pud = vmemmap_pud_populate(p4d, addr, node); | |
29c71111 AW |
235 | if (!pud) |
236 | return -ENOMEM; | |
237 | pmd = vmemmap_pmd_populate(pud, addr, node); | |
238 | if (!pmd) | |
239 | return -ENOMEM; | |
240 | pte = vmemmap_pte_populate(pmd, addr, node); | |
241 | if (!pte) | |
242 | return -ENOMEM; | |
243 | vmemmap_verify(pte, node, addr, addr + PAGE_SIZE); | |
8f6aac41 | 244 | } |
29c71111 AW |
245 | |
246 | return 0; | |
8f6aac41 | 247 | } |
8f6aac41 | 248 | |
7b73d978 CH |
249 | struct page * __meminit sparse_mem_map_populate(unsigned long pnum, int nid, |
250 | struct vmem_altmap *altmap) | |
8f6aac41 | 251 | { |
0aad818b JW |
252 | unsigned long start; |
253 | unsigned long end; | |
254 | struct page *map; | |
255 | ||
256 | map = pfn_to_page(pnum * PAGES_PER_SECTION); | |
257 | start = (unsigned long)map; | |
258 | end = (unsigned long)(map + PAGES_PER_SECTION); | |
259 | ||
7b73d978 | 260 | if (vmemmap_populate(start, end, nid, altmap)) |
8f6aac41 CL |
261 | return NULL; |
262 | ||
263 | return map; | |
264 | } |