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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> | |
97ad1087 | 23 | #include <linux/memblock.h> |
4b94ffdc | 24 | #include <linux/memremap.h> |
8f6aac41 | 25 | #include <linux/highmem.h> |
5a0e3ad6 | 26 | #include <linux/slab.h> |
8f6aac41 CL |
27 | #include <linux/spinlock.h> |
28 | #include <linux/vmalloc.h> | |
8bca44bb | 29 | #include <linux/sched.h> |
8f6aac41 CL |
30 | #include <asm/dma.h> |
31 | #include <asm/pgalloc.h> | |
32 | #include <asm/pgtable.h> | |
33 | ||
34 | /* | |
35 | * Allocate a block of memory to be used to back the virtual memory map | |
36 | * or to back the page tables that are used to create the mapping. | |
37 | * Uses the main allocators if they are available, else bootmem. | |
38 | */ | |
e0dc3a53 | 39 | |
bd721ea7 | 40 | static void * __ref __earlyonly_bootmem_alloc(int node, |
e0dc3a53 KH |
41 | unsigned long size, |
42 | unsigned long align, | |
43 | unsigned long goal) | |
44 | { | |
eb31d559 | 45 | return memblock_alloc_try_nid_raw(size, align, goal, |
97ad1087 | 46 | MEMBLOCK_ALLOC_ACCESSIBLE, node); |
e0dc3a53 KH |
47 | } |
48 | ||
8f6aac41 CL |
49 | void * __meminit vmemmap_alloc_block(unsigned long size, int node) |
50 | { | |
51 | /* If the main allocator is up use that, fallback to bootmem. */ | |
52 | if (slab_is_available()) { | |
fcdaf842 MH |
53 | gfp_t gfp_mask = GFP_KERNEL|__GFP_RETRY_MAYFAIL|__GFP_NOWARN; |
54 | int order = get_order(size); | |
55 | static bool warned; | |
f52407ce SL |
56 | struct page *page; |
57 | ||
fcdaf842 | 58 | page = alloc_pages_node(node, gfp_mask, order); |
8f6aac41 CL |
59 | if (page) |
60 | return page_address(page); | |
fcdaf842 MH |
61 | |
62 | if (!warned) { | |
63 | warn_alloc(gfp_mask & ~__GFP_NOWARN, NULL, | |
64 | "vmemmap alloc failure: order:%u", order); | |
65 | warned = true; | |
66 | } | |
8f6aac41 CL |
67 | return NULL; |
68 | } else | |
e0dc3a53 | 69 | return __earlyonly_bootmem_alloc(node, size, size, |
8f6aac41 CL |
70 | __pa(MAX_DMA_ADDRESS)); |
71 | } | |
72 | ||
9bdac914 | 73 | /* need to make sure size is all the same during early stage */ |
a8fc357b | 74 | void * __meminit vmemmap_alloc_block_buf(unsigned long size, int node) |
9bdac914 | 75 | { |
35fd1eb1 | 76 | void *ptr = sparse_buffer_alloc(size); |
9bdac914 | 77 | |
35fd1eb1 PT |
78 | if (!ptr) |
79 | ptr = vmemmap_alloc_block(size, node); | |
9bdac914 YL |
80 | return ptr; |
81 | } | |
82 | ||
4b94ffdc DW |
83 | static unsigned long __meminit vmem_altmap_next_pfn(struct vmem_altmap *altmap) |
84 | { | |
85 | return altmap->base_pfn + altmap->reserve + altmap->alloc | |
86 | + altmap->align; | |
87 | } | |
88 | ||
89 | static unsigned long __meminit vmem_altmap_nr_free(struct vmem_altmap *altmap) | |
90 | { | |
91 | unsigned long allocated = altmap->alloc + altmap->align; | |
92 | ||
93 | if (altmap->free > allocated) | |
94 | return altmap->free - allocated; | |
95 | return 0; | |
96 | } | |
97 | ||
98 | /** | |
eb804533 CH |
99 | * altmap_alloc_block_buf - allocate pages from the device page map |
100 | * @altmap: device page map | |
101 | * @size: size (in bytes) of the allocation | |
4b94ffdc | 102 | * |
eb804533 | 103 | * Allocations are aligned to the size of the request. |
4b94ffdc | 104 | */ |
a8fc357b | 105 | void * __meminit altmap_alloc_block_buf(unsigned long size, |
4b94ffdc DW |
106 | struct vmem_altmap *altmap) |
107 | { | |
eb804533 | 108 | unsigned long pfn, nr_pfns, nr_align; |
4b94ffdc DW |
109 | |
110 | if (size & ~PAGE_MASK) { | |
111 | pr_warn_once("%s: allocations must be multiple of PAGE_SIZE (%ld)\n", | |
112 | __func__, size); | |
113 | return NULL; | |
114 | } | |
115 | ||
eb804533 | 116 | pfn = vmem_altmap_next_pfn(altmap); |
4b94ffdc | 117 | nr_pfns = size >> PAGE_SHIFT; |
eb804533 CH |
118 | nr_align = 1UL << find_first_bit(&nr_pfns, BITS_PER_LONG); |
119 | nr_align = ALIGN(pfn, nr_align) - pfn; | |
120 | if (nr_pfns + nr_align > vmem_altmap_nr_free(altmap)) | |
121 | return NULL; | |
122 | ||
123 | altmap->alloc += nr_pfns; | |
124 | altmap->align += nr_align; | |
125 | pfn += nr_align; | |
126 | ||
4b94ffdc DW |
127 | pr_debug("%s: pfn: %#lx alloc: %ld align: %ld nr: %#lx\n", |
128 | __func__, pfn, altmap->alloc, altmap->align, nr_pfns); | |
eb804533 | 129 | return __va(__pfn_to_phys(pfn)); |
4b94ffdc DW |
130 | } |
131 | ||
8f6aac41 CL |
132 | void __meminit vmemmap_verify(pte_t *pte, int node, |
133 | unsigned long start, unsigned long end) | |
134 | { | |
135 | unsigned long pfn = pte_pfn(*pte); | |
136 | int actual_node = early_pfn_to_nid(pfn); | |
137 | ||
b41ad14c | 138 | if (node_distance(actual_node, node) > LOCAL_DISTANCE) |
1170532b JP |
139 | pr_warn("[%lx-%lx] potential offnode page_structs\n", |
140 | start, end - 1); | |
8f6aac41 CL |
141 | } |
142 | ||
29c71111 | 143 | pte_t * __meminit vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node) |
8f6aac41 | 144 | { |
29c71111 AW |
145 | pte_t *pte = pte_offset_kernel(pmd, addr); |
146 | if (pte_none(*pte)) { | |
147 | pte_t entry; | |
a8fc357b | 148 | void *p = vmemmap_alloc_block_buf(PAGE_SIZE, node); |
29c71111 | 149 | if (!p) |
9dce07f1 | 150 | return NULL; |
29c71111 AW |
151 | entry = pfn_pte(__pa(p) >> PAGE_SHIFT, PAGE_KERNEL); |
152 | set_pte_at(&init_mm, addr, pte, entry); | |
153 | } | |
154 | return pte; | |
8f6aac41 CL |
155 | } |
156 | ||
f7f99100 PT |
157 | static void * __meminit vmemmap_alloc_block_zero(unsigned long size, int node) |
158 | { | |
159 | void *p = vmemmap_alloc_block(size, node); | |
160 | ||
161 | if (!p) | |
162 | return NULL; | |
163 | memset(p, 0, size); | |
164 | ||
165 | return p; | |
166 | } | |
167 | ||
29c71111 | 168 | pmd_t * __meminit vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node) |
8f6aac41 | 169 | { |
29c71111 AW |
170 | pmd_t *pmd = pmd_offset(pud, addr); |
171 | if (pmd_none(*pmd)) { | |
f7f99100 | 172 | void *p = vmemmap_alloc_block_zero(PAGE_SIZE, node); |
29c71111 | 173 | if (!p) |
9dce07f1 | 174 | return NULL; |
29c71111 | 175 | pmd_populate_kernel(&init_mm, pmd, p); |
8f6aac41 | 176 | } |
29c71111 | 177 | return pmd; |
8f6aac41 | 178 | } |
8f6aac41 | 179 | |
c2febafc | 180 | pud_t * __meminit vmemmap_pud_populate(p4d_t *p4d, unsigned long addr, int node) |
8f6aac41 | 181 | { |
c2febafc | 182 | pud_t *pud = pud_offset(p4d, addr); |
29c71111 | 183 | if (pud_none(*pud)) { |
f7f99100 | 184 | void *p = vmemmap_alloc_block_zero(PAGE_SIZE, node); |
29c71111 | 185 | if (!p) |
9dce07f1 | 186 | return NULL; |
29c71111 AW |
187 | pud_populate(&init_mm, pud, p); |
188 | } | |
189 | return pud; | |
190 | } | |
8f6aac41 | 191 | |
c2febafc KS |
192 | p4d_t * __meminit vmemmap_p4d_populate(pgd_t *pgd, unsigned long addr, int node) |
193 | { | |
194 | p4d_t *p4d = p4d_offset(pgd, addr); | |
195 | if (p4d_none(*p4d)) { | |
f7f99100 | 196 | void *p = vmemmap_alloc_block_zero(PAGE_SIZE, node); |
c2febafc KS |
197 | if (!p) |
198 | return NULL; | |
199 | p4d_populate(&init_mm, p4d, p); | |
200 | } | |
201 | return p4d; | |
202 | } | |
203 | ||
29c71111 AW |
204 | pgd_t * __meminit vmemmap_pgd_populate(unsigned long addr, int node) |
205 | { | |
206 | pgd_t *pgd = pgd_offset_k(addr); | |
207 | if (pgd_none(*pgd)) { | |
f7f99100 | 208 | void *p = vmemmap_alloc_block_zero(PAGE_SIZE, node); |
29c71111 | 209 | if (!p) |
9dce07f1 | 210 | return NULL; |
29c71111 | 211 | pgd_populate(&init_mm, pgd, p); |
8f6aac41 | 212 | } |
29c71111 | 213 | return pgd; |
8f6aac41 CL |
214 | } |
215 | ||
0aad818b JW |
216 | int __meminit vmemmap_populate_basepages(unsigned long start, |
217 | unsigned long end, int node) | |
8f6aac41 | 218 | { |
0aad818b | 219 | unsigned long addr = start; |
29c71111 | 220 | pgd_t *pgd; |
c2febafc | 221 | p4d_t *p4d; |
29c71111 AW |
222 | pud_t *pud; |
223 | pmd_t *pmd; | |
224 | pte_t *pte; | |
8f6aac41 | 225 | |
29c71111 AW |
226 | for (; addr < end; addr += PAGE_SIZE) { |
227 | pgd = vmemmap_pgd_populate(addr, node); | |
228 | if (!pgd) | |
229 | return -ENOMEM; | |
c2febafc KS |
230 | p4d = vmemmap_p4d_populate(pgd, addr, node); |
231 | if (!p4d) | |
232 | return -ENOMEM; | |
233 | pud = vmemmap_pud_populate(p4d, addr, node); | |
29c71111 AW |
234 | if (!pud) |
235 | return -ENOMEM; | |
236 | pmd = vmemmap_pmd_populate(pud, addr, node); | |
237 | if (!pmd) | |
238 | return -ENOMEM; | |
239 | pte = vmemmap_pte_populate(pmd, addr, node); | |
240 | if (!pte) | |
241 | return -ENOMEM; | |
242 | vmemmap_verify(pte, node, addr, addr + PAGE_SIZE); | |
8f6aac41 | 243 | } |
29c71111 AW |
244 | |
245 | return 0; | |
8f6aac41 | 246 | } |
8f6aac41 | 247 | |
7b73d978 CH |
248 | struct page * __meminit sparse_mem_map_populate(unsigned long pnum, int nid, |
249 | struct vmem_altmap *altmap) | |
8f6aac41 | 250 | { |
0aad818b JW |
251 | unsigned long start; |
252 | unsigned long end; | |
253 | struct page *map; | |
254 | ||
255 | map = pfn_to_page(pnum * PAGES_PER_SECTION); | |
256 | start = (unsigned long)map; | |
257 | end = (unsigned long)(map + PAGES_PER_SECTION); | |
258 | ||
7b73d978 | 259 | if (vmemmap_populate(start, end, nid, altmap)) |
8f6aac41 CL |
260 | return NULL; |
261 | ||
262 | return map; | |
263 | } |