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1 | // SPDX-License-Identifier: GPL-2.0-or-later | |
2 | /* | |
3 | * PowerPC version | |
4 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
5 | * | |
6 | * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au) | |
7 | * and Cort Dougan (PReP) (cort@cs.nmt.edu) | |
8 | * Copyright (C) 1996 Paul Mackerras | |
9 | * | |
10 | * Derived from "arch/i386/mm/init.c" | |
11 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
12 | * | |
13 | * Dave Engebretsen <engebret@us.ibm.com> | |
14 | * Rework for PPC64 port. | |
15 | */ | |
16 | ||
17 | #undef DEBUG | |
18 | ||
19 | #include <linux/signal.h> | |
20 | #include <linux/sched.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/string.h> | |
24 | #include <linux/types.h> | |
25 | #include <linux/mman.h> | |
26 | #include <linux/mm.h> | |
27 | #include <linux/swap.h> | |
28 | #include <linux/stddef.h> | |
29 | #include <linux/vmalloc.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/delay.h> | |
32 | #include <linux/highmem.h> | |
33 | #include <linux/idr.h> | |
34 | #include <linux/nodemask.h> | |
35 | #include <linux/module.h> | |
36 | #include <linux/poison.h> | |
37 | #include <linux/memblock.h> | |
38 | #include <linux/hugetlb.h> | |
39 | #include <linux/slab.h> | |
40 | #include <linux/of_fdt.h> | |
41 | #include <linux/libfdt.h> | |
42 | #include <linux/memremap.h> | |
43 | ||
44 | #include <asm/pgalloc.h> | |
45 | #include <asm/page.h> | |
46 | #include <asm/prom.h> | |
47 | #include <asm/rtas.h> | |
48 | #include <asm/io.h> | |
49 | #include <asm/mmu_context.h> | |
50 | #include <asm/pgtable.h> | |
51 | #include <asm/mmu.h> | |
52 | #include <linux/uaccess.h> | |
53 | #include <asm/smp.h> | |
54 | #include <asm/machdep.h> | |
55 | #include <asm/tlb.h> | |
56 | #include <asm/eeh.h> | |
57 | #include <asm/processor.h> | |
58 | #include <asm/mmzone.h> | |
59 | #include <asm/cputable.h> | |
60 | #include <asm/sections.h> | |
61 | #include <asm/iommu.h> | |
62 | #include <asm/vdso.h> | |
63 | ||
64 | #include <mm/mmu_decl.h> | |
65 | ||
66 | phys_addr_t memstart_addr = ~0; | |
67 | EXPORT_SYMBOL_GPL(memstart_addr); | |
68 | phys_addr_t kernstart_addr; | |
69 | EXPORT_SYMBOL_GPL(kernstart_addr); | |
70 | ||
71 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
72 | /* | |
73 | * Given an address within the vmemmap, determine the pfn of the page that | |
74 | * represents the start of the section it is within. Note that we have to | |
75 | * do this by hand as the proffered address may not be correctly aligned. | |
76 | * Subtraction of non-aligned pointers produces undefined results. | |
77 | */ | |
78 | static unsigned long __meminit vmemmap_section_start(unsigned long page) | |
79 | { | |
80 | unsigned long offset = page - ((unsigned long)(vmemmap)); | |
81 | ||
82 | /* Return the pfn of the start of the section. */ | |
83 | return (offset / sizeof(struct page)) & PAGE_SECTION_MASK; | |
84 | } | |
85 | ||
86 | /* | |
87 | * Check if this vmemmap page is already initialised. If any section | |
88 | * which overlaps this vmemmap page is initialised then this page is | |
89 | * initialised already. | |
90 | */ | |
91 | static int __meminit vmemmap_populated(unsigned long start, int page_size) | |
92 | { | |
93 | unsigned long end = start + page_size; | |
94 | start = (unsigned long)(pfn_to_page(vmemmap_section_start(start))); | |
95 | ||
96 | for (; start < end; start += (PAGES_PER_SECTION * sizeof(struct page))) | |
97 | if (pfn_valid(page_to_pfn((struct page *)start))) | |
98 | return 1; | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
103 | /* | |
104 | * vmemmap virtual address space management does not have a traditonal page | |
105 | * table to track which virtual struct pages are backed by physical mapping. | |
106 | * The virtual to physical mappings are tracked in a simple linked list | |
107 | * format. 'vmemmap_list' maintains the entire vmemmap physical mapping at | |
108 | * all times where as the 'next' list maintains the available | |
109 | * vmemmap_backing structures which have been deleted from the | |
110 | * 'vmemmap_global' list during system runtime (memory hotplug remove | |
111 | * operation). The freed 'vmemmap_backing' structures are reused later when | |
112 | * new requests come in without allocating fresh memory. This pointer also | |
113 | * tracks the allocated 'vmemmap_backing' structures as we allocate one | |
114 | * full page memory at a time when we dont have any. | |
115 | */ | |
116 | struct vmemmap_backing *vmemmap_list; | |
117 | static struct vmemmap_backing *next; | |
118 | ||
119 | /* | |
120 | * The same pointer 'next' tracks individual chunks inside the allocated | |
121 | * full page during the boot time and again tracks the freeed nodes during | |
122 | * runtime. It is racy but it does not happen as they are separated by the | |
123 | * boot process. Will create problem if some how we have memory hotplug | |
124 | * operation during boot !! | |
125 | */ | |
126 | static int num_left; | |
127 | static int num_freed; | |
128 | ||
129 | static __meminit struct vmemmap_backing * vmemmap_list_alloc(int node) | |
130 | { | |
131 | struct vmemmap_backing *vmem_back; | |
132 | /* get from freed entries first */ | |
133 | if (num_freed) { | |
134 | num_freed--; | |
135 | vmem_back = next; | |
136 | next = next->list; | |
137 | ||
138 | return vmem_back; | |
139 | } | |
140 | ||
141 | /* allocate a page when required and hand out chunks */ | |
142 | if (!num_left) { | |
143 | next = vmemmap_alloc_block(PAGE_SIZE, node); | |
144 | if (unlikely(!next)) { | |
145 | WARN_ON(1); | |
146 | return NULL; | |
147 | } | |
148 | num_left = PAGE_SIZE / sizeof(struct vmemmap_backing); | |
149 | } | |
150 | ||
151 | num_left--; | |
152 | ||
153 | return next++; | |
154 | } | |
155 | ||
156 | static __meminit void vmemmap_list_populate(unsigned long phys, | |
157 | unsigned long start, | |
158 | int node) | |
159 | { | |
160 | struct vmemmap_backing *vmem_back; | |
161 | ||
162 | vmem_back = vmemmap_list_alloc(node); | |
163 | if (unlikely(!vmem_back)) { | |
164 | WARN_ON(1); | |
165 | return; | |
166 | } | |
167 | ||
168 | vmem_back->phys = phys; | |
169 | vmem_back->virt_addr = start; | |
170 | vmem_back->list = vmemmap_list; | |
171 | ||
172 | vmemmap_list = vmem_back; | |
173 | } | |
174 | ||
175 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, | |
176 | struct vmem_altmap *altmap) | |
177 | { | |
178 | unsigned long page_size = 1 << mmu_psize_defs[mmu_vmemmap_psize].shift; | |
179 | ||
180 | /* Align to the page size of the linear mapping. */ | |
181 | start = _ALIGN_DOWN(start, page_size); | |
182 | ||
183 | pr_debug("vmemmap_populate %lx..%lx, node %d\n", start, end, node); | |
184 | ||
185 | for (; start < end; start += page_size) { | |
186 | void *p = NULL; | |
187 | int rc; | |
188 | ||
189 | if (vmemmap_populated(start, page_size)) | |
190 | continue; | |
191 | ||
192 | /* | |
193 | * Allocate from the altmap first if we have one. This may | |
194 | * fail due to alignment issues when using 16MB hugepages, so | |
195 | * fall back to system memory if the altmap allocation fail. | |
196 | */ | |
197 | if (altmap) | |
198 | p = altmap_alloc_block_buf(page_size, altmap); | |
199 | if (!p) | |
200 | p = vmemmap_alloc_block_buf(page_size, node); | |
201 | if (!p) | |
202 | return -ENOMEM; | |
203 | ||
204 | vmemmap_list_populate(__pa(p), start, node); | |
205 | ||
206 | pr_debug(" * %016lx..%016lx allocated at %p\n", | |
207 | start, start + page_size, p); | |
208 | ||
209 | rc = vmemmap_create_mapping(start, page_size, __pa(p)); | |
210 | if (rc < 0) { | |
211 | pr_warn("%s: Unable to create vmemmap mapping: %d\n", | |
212 | __func__, rc); | |
213 | return -EFAULT; | |
214 | } | |
215 | } | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
220 | #ifdef CONFIG_MEMORY_HOTPLUG | |
221 | static unsigned long vmemmap_list_free(unsigned long start) | |
222 | { | |
223 | struct vmemmap_backing *vmem_back, *vmem_back_prev; | |
224 | ||
225 | vmem_back_prev = vmem_back = vmemmap_list; | |
226 | ||
227 | /* look for it with prev pointer recorded */ | |
228 | for (; vmem_back; vmem_back = vmem_back->list) { | |
229 | if (vmem_back->virt_addr == start) | |
230 | break; | |
231 | vmem_back_prev = vmem_back; | |
232 | } | |
233 | ||
234 | if (unlikely(!vmem_back)) { | |
235 | WARN_ON(1); | |
236 | return 0; | |
237 | } | |
238 | ||
239 | /* remove it from vmemmap_list */ | |
240 | if (vmem_back == vmemmap_list) /* remove head */ | |
241 | vmemmap_list = vmem_back->list; | |
242 | else | |
243 | vmem_back_prev->list = vmem_back->list; | |
244 | ||
245 | /* next point to this freed entry */ | |
246 | vmem_back->list = next; | |
247 | next = vmem_back; | |
248 | num_freed++; | |
249 | ||
250 | return vmem_back->phys; | |
251 | } | |
252 | ||
253 | void __ref vmemmap_free(unsigned long start, unsigned long end, | |
254 | struct vmem_altmap *altmap) | |
255 | { | |
256 | unsigned long page_size = 1 << mmu_psize_defs[mmu_vmemmap_psize].shift; | |
257 | unsigned long page_order = get_order(page_size); | |
258 | unsigned long alt_start = ~0, alt_end = ~0; | |
259 | unsigned long base_pfn; | |
260 | ||
261 | start = _ALIGN_DOWN(start, page_size); | |
262 | if (altmap) { | |
263 | alt_start = altmap->base_pfn; | |
264 | alt_end = altmap->base_pfn + altmap->reserve + | |
265 | altmap->free + altmap->alloc + altmap->align; | |
266 | } | |
267 | ||
268 | pr_debug("vmemmap_free %lx...%lx\n", start, end); | |
269 | ||
270 | for (; start < end; start += page_size) { | |
271 | unsigned long nr_pages, addr; | |
272 | struct page *page; | |
273 | ||
274 | /* | |
275 | * the section has already be marked as invalid, so | |
276 | * vmemmap_populated() true means some other sections still | |
277 | * in this page, so skip it. | |
278 | */ | |
279 | if (vmemmap_populated(start, page_size)) | |
280 | continue; | |
281 | ||
282 | addr = vmemmap_list_free(start); | |
283 | if (!addr) | |
284 | continue; | |
285 | ||
286 | page = pfn_to_page(addr >> PAGE_SHIFT); | |
287 | nr_pages = 1 << page_order; | |
288 | base_pfn = PHYS_PFN(addr); | |
289 | ||
290 | if (base_pfn >= alt_start && base_pfn < alt_end) { | |
291 | vmem_altmap_free(altmap, nr_pages); | |
292 | } else if (PageReserved(page)) { | |
293 | /* allocated from bootmem */ | |
294 | if (page_size < PAGE_SIZE) { | |
295 | /* | |
296 | * this shouldn't happen, but if it is | |
297 | * the case, leave the memory there | |
298 | */ | |
299 | WARN_ON_ONCE(1); | |
300 | } else { | |
301 | while (nr_pages--) | |
302 | free_reserved_page(page++); | |
303 | } | |
304 | } else { | |
305 | free_pages((unsigned long)(__va(addr)), page_order); | |
306 | } | |
307 | ||
308 | vmemmap_remove_mapping(start, page_size); | |
309 | } | |
310 | } | |
311 | #endif | |
312 | void register_page_bootmem_memmap(unsigned long section_nr, | |
313 | struct page *start_page, unsigned long size) | |
314 | { | |
315 | } | |
316 | ||
317 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ | |
318 | ||
319 | #ifdef CONFIG_PPC_BOOK3S_64 | |
320 | static bool disable_radix = !IS_ENABLED(CONFIG_PPC_RADIX_MMU_DEFAULT); | |
321 | ||
322 | static int __init parse_disable_radix(char *p) | |
323 | { | |
324 | bool val; | |
325 | ||
326 | if (!p) | |
327 | val = true; | |
328 | else if (kstrtobool(p, &val)) | |
329 | return -EINVAL; | |
330 | ||
331 | disable_radix = val; | |
332 | ||
333 | return 0; | |
334 | } | |
335 | early_param("disable_radix", parse_disable_radix); | |
336 | ||
337 | /* | |
338 | * If we're running under a hypervisor, we need to check the contents of | |
339 | * /chosen/ibm,architecture-vec-5 to see if the hypervisor is willing to do | |
340 | * radix. If not, we clear the radix feature bit so we fall back to hash. | |
341 | */ | |
342 | static void __init early_check_vec5(void) | |
343 | { | |
344 | unsigned long root, chosen; | |
345 | int size; | |
346 | const u8 *vec5; | |
347 | u8 mmu_supported; | |
348 | ||
349 | root = of_get_flat_dt_root(); | |
350 | chosen = of_get_flat_dt_subnode_by_name(root, "chosen"); | |
351 | if (chosen == -FDT_ERR_NOTFOUND) { | |
352 | cur_cpu_spec->mmu_features &= ~MMU_FTR_TYPE_RADIX; | |
353 | return; | |
354 | } | |
355 | vec5 = of_get_flat_dt_prop(chosen, "ibm,architecture-vec-5", &size); | |
356 | if (!vec5) { | |
357 | cur_cpu_spec->mmu_features &= ~MMU_FTR_TYPE_RADIX; | |
358 | return; | |
359 | } | |
360 | if (size <= OV5_INDX(OV5_MMU_SUPPORT)) { | |
361 | cur_cpu_spec->mmu_features &= ~MMU_FTR_TYPE_RADIX; | |
362 | return; | |
363 | } | |
364 | ||
365 | /* Check for supported configuration */ | |
366 | mmu_supported = vec5[OV5_INDX(OV5_MMU_SUPPORT)] & | |
367 | OV5_FEAT(OV5_MMU_SUPPORT); | |
368 | if (mmu_supported == OV5_FEAT(OV5_MMU_RADIX)) { | |
369 | /* Hypervisor only supports radix - check enabled && GTSE */ | |
370 | if (!early_radix_enabled()) { | |
371 | pr_warn("WARNING: Ignoring cmdline option disable_radix\n"); | |
372 | } | |
373 | if (!(vec5[OV5_INDX(OV5_RADIX_GTSE)] & | |
374 | OV5_FEAT(OV5_RADIX_GTSE))) { | |
375 | pr_warn("WARNING: Hypervisor doesn't support RADIX with GTSE\n"); | |
376 | } | |
377 | /* Do radix anyway - the hypervisor said we had to */ | |
378 | cur_cpu_spec->mmu_features |= MMU_FTR_TYPE_RADIX; | |
379 | } else if (mmu_supported == OV5_FEAT(OV5_MMU_HASH)) { | |
380 | /* Hypervisor only supports hash - disable radix */ | |
381 | cur_cpu_spec->mmu_features &= ~MMU_FTR_TYPE_RADIX; | |
382 | } | |
383 | } | |
384 | ||
385 | void __init mmu_early_init_devtree(void) | |
386 | { | |
387 | /* Disable radix mode based on kernel command line. */ | |
388 | if (disable_radix) | |
389 | cur_cpu_spec->mmu_features &= ~MMU_FTR_TYPE_RADIX; | |
390 | ||
391 | /* | |
392 | * Check /chosen/ibm,architecture-vec-5 if running as a guest. | |
393 | * When running bare-metal, we can use radix if we like | |
394 | * even though the ibm,architecture-vec-5 property created by | |
395 | * skiboot doesn't have the necessary bits set. | |
396 | */ | |
397 | if (!(mfmsr() & MSR_HV)) | |
398 | early_check_vec5(); | |
399 | ||
400 | if (early_radix_enabled()) | |
401 | radix__early_init_devtree(); | |
402 | else | |
403 | hash__early_init_devtree(); | |
404 | } | |
405 | #endif /* CONFIG_PPC_BOOK3S_64 */ |