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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / arch / sh / mm / init.c
blobd1b1ff2be17aa728a84ba8e8701313664e9a76df
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/arch/sh/mm/init.c
4 *
5 * Copyright (C) 1999 Niibe Yutaka
6 * Copyright (C) 2002 - 2011 Paul Mundt
7 *
8 * Based on linux/arch/i386/mm/init.c:
9 * Copyright (C) 1995 Linus Torvalds
10 */
11 #include <linux/mm.h>
12 #include <linux/swap.h>
13 #include <linux/init.h>
14 #include <linux/gfp.h>
15 #include <linux/memblock.h>
16 #include <linux/proc_fs.h>
17 #include <linux/pagemap.h>
18 #include <linux/percpu.h>
19 #include <linux/io.h>
20 #include <linux/dma-mapping.h>
21 #include <linux/export.h>
22 #include <asm/mmu_context.h>
23 #include <asm/mmzone.h>
24 #include <asm/kexec.h>
25 #include <asm/tlb.h>
26 #include <asm/cacheflush.h>
27 #include <asm/sections.h>
28 #include <asm/setup.h>
29 #include <asm/cache.h>
30 #include <linux/sizes.h>
31
32 pgd_t swapper_pg_dir[PTRS_PER_PGD];
33
34 void __init generic_mem_init(void)
35 {
36 memblock_add(__MEMORY_START, __MEMORY_SIZE);
37 }
38
39 void __init __weak plat_mem_setup(void)
40 {
41 /* Nothing to see here, move along. */
42 }
43
44 #ifdef CONFIG_MMU
45 static pte_t *__get_pte_phys(unsigned long addr)
46 {
47 pgd_t *pgd;
48 pud_t *pud;
49 pmd_t *pmd;
50
51 pgd = pgd_offset_k(addr);
52 if (pgd_none(*pgd)) {
53 pgd_ERROR(*pgd);
54 return NULL;
55 }
56
57 pud = pud_alloc(NULL, pgd, addr);
58 if (unlikely(!pud)) {
59 pud_ERROR(*pud);
60 return NULL;
61 }
62
63 pmd = pmd_alloc(NULL, pud, addr);
64 if (unlikely(!pmd)) {
65 pmd_ERROR(*pmd);
66 return NULL;
67 }
68
69 return pte_offset_kernel(pmd, addr);
70 }
71
72 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
73 {
74 pte_t *pte;
75
76 pte = __get_pte_phys(addr);
77 if (!pte_none(*pte)) {
78 pte_ERROR(*pte);
79 return;
80 }
81
82 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
83 local_flush_tlb_one(get_asid(), addr);
84
85 if (pgprot_val(prot) & _PAGE_WIRED)
86 tlb_wire_entry(NULL, addr, *pte);
87 }
88
89 static void clear_pte_phys(unsigned long addr, pgprot_t prot)
90 {
91 pte_t *pte;
92
93 pte = __get_pte_phys(addr);
94
95 if (pgprot_val(prot) & _PAGE_WIRED)
96 tlb_unwire_entry();
97
98 set_pte(pte, pfn_pte(0, __pgprot(0)));
99 local_flush_tlb_one(get_asid(), addr);
100 }
101
102 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
103 {
104 unsigned long address = __fix_to_virt(idx);
105
106 if (idx >= __end_of_fixed_addresses) {
107 BUG();
108 return;
109 }
110
111 set_pte_phys(address, phys, prot);
112 }
113
114 void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
115 {
116 unsigned long address = __fix_to_virt(idx);
117
118 if (idx >= __end_of_fixed_addresses) {
119 BUG();
120 return;
121 }
122
123 clear_pte_phys(address, prot);
124 }
125
126 static pmd_t * __init one_md_table_init(pud_t *pud)
127 {
128 if (pud_none(*pud)) {
129 pmd_t *pmd;
130
131 pmd = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
132 if (!pmd)
133 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
134 __func__, PAGE_SIZE, PAGE_SIZE);
135 pud_populate(&init_mm, pud, pmd);
136 BUG_ON(pmd != pmd_offset(pud, 0));
137 }
138
139 return pmd_offset(pud, 0);
140 }
141
142 static pte_t * __init one_page_table_init(pmd_t *pmd)
143 {
144 if (pmd_none(*pmd)) {
145 pte_t *pte;
146
147 pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
148 if (!pte)
149 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
150 __func__, PAGE_SIZE, PAGE_SIZE);
151 pmd_populate_kernel(&init_mm, pmd, pte);
152 BUG_ON(pte != pte_offset_kernel(pmd, 0));
153 }
154
155 return pte_offset_kernel(pmd, 0);
156 }
157
158 static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
159 unsigned long vaddr, pte_t *lastpte)
160 {
161 return pte;
162 }
163
164 void __init page_table_range_init(unsigned long start, unsigned long end,
165 pgd_t *pgd_base)
166 {
167 pgd_t *pgd;
168 pud_t *pud;
169 pmd_t *pmd;
170 pte_t *pte = NULL;
171 int i, j, k;
172 unsigned long vaddr;
173
174 vaddr = start;
175 i = __pgd_offset(vaddr);
176 j = __pud_offset(vaddr);
177 k = __pmd_offset(vaddr);
178 pgd = pgd_base + i;
179
180 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
181 pud = (pud_t *)pgd;
182 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
183 pmd = one_md_table_init(pud);
184 #ifndef __PAGETABLE_PMD_FOLDED
185 pmd += k;
186 #endif
187 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
188 pte = page_table_kmap_check(one_page_table_init(pmd),
189 pmd, vaddr, pte);
190 vaddr += PMD_SIZE;
191 }
192 k = 0;
193 }
194 j = 0;
195 }
196 }
197 #endif /* CONFIG_MMU */
198
199 void __init allocate_pgdat(unsigned int nid)
200 {
201 unsigned long start_pfn, end_pfn;
202
203 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
204
205 #ifdef CONFIG_NEED_MULTIPLE_NODES
206 NODE_DATA(nid) = memblock_alloc_try_nid(
207 sizeof(struct pglist_data),
208 SMP_CACHE_BYTES, MEMBLOCK_LOW_LIMIT,
209 MEMBLOCK_ALLOC_ACCESSIBLE, nid);
210 if (!NODE_DATA(nid))
211 panic("Can't allocate pgdat for node %d\n", nid);
212 #endif
213
214 NODE_DATA(nid)->node_start_pfn = start_pfn;
215 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
216 }
217
218 static void __init do_init_bootmem(void)
219 {
220 struct memblock_region *reg;
221
222 /* Add active regions with valid PFNs. */
223 for_each_memblock(memory, reg) {
224 unsigned long start_pfn, end_pfn;
225 start_pfn = memblock_region_memory_base_pfn(reg);
226 end_pfn = memblock_region_memory_end_pfn(reg);
227 __add_active_range(0, start_pfn, end_pfn);
228 }
229
230 /* All of system RAM sits in node 0 for the non-NUMA case */
231 allocate_pgdat(0);
232 node_set_online(0);
233
234 plat_mem_setup();
235
236 for_each_memblock(memory, reg) {
237 int nid = memblock_get_region_node(reg);
238
239 memory_present(nid, memblock_region_memory_base_pfn(reg),
240 memblock_region_memory_end_pfn(reg));
241 }
242 sparse_init();
243 }
244
245 static void __init early_reserve_mem(void)
246 {
247 unsigned long start_pfn;
248 u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET;
249 u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET;
250
251 /*
252 * Partially used pages are not usable - thus
253 * we are rounding upwards:
254 */
255 start_pfn = PFN_UP(__pa(_end));
256
257 /*
258 * Reserve the kernel text and Reserve the bootmem bitmap. We do
259 * this in two steps (first step was init_bootmem()), because
260 * this catches the (definitely buggy) case of us accidentally
261 * initializing the bootmem allocator with an invalid RAM area.
262 */
263 memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start);
264
265 /*
266 * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
267 */
268 if (CONFIG_ZERO_PAGE_OFFSET != 0)
269 memblock_reserve(zero_base, CONFIG_ZERO_PAGE_OFFSET);
270
271 /*
272 * Handle additional early reservations
273 */
274 check_for_initrd();
275 reserve_crashkernel();
276 }
277
278 void __init paging_init(void)
279 {
280 unsigned long max_zone_pfns[MAX_NR_ZONES];
281 unsigned long vaddr, end;
282
283 sh_mv.mv_mem_init();
284
285 early_reserve_mem();
286
287 /*
288 * Once the early reservations are out of the way, give the
289 * platforms a chance to kick out some memory.
290 */
291 if (sh_mv.mv_mem_reserve)
292 sh_mv.mv_mem_reserve();
293
294 memblock_enforce_memory_limit(memory_limit);
295 memblock_allow_resize();
296
297 memblock_dump_all();
298
299 /*
300 * Determine low and high memory ranges:
301 */
302 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
303 min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
304
305 nodes_clear(node_online_map);
306
307 memory_start = (unsigned long)__va(__MEMORY_START);
308 memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size());
309
310 uncached_init();
311 pmb_init();
312 do_init_bootmem();
313 ioremap_fixed_init();
314
315 /* We don't need to map the kernel through the TLB, as
316 * it is permanatly mapped using P1. So clear the
317 * entire pgd. */
318 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
319
320 /* Set an initial value for the MMU.TTB so we don't have to
321 * check for a null value. */
322 set_TTB(swapper_pg_dir);
323
324 /*
325 * Populate the relevant portions of swapper_pg_dir so that
326 * we can use the fixmap entries without calling kmalloc.
327 * pte's will be filled in by __set_fixmap().
328 */
329 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
330 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
331 page_table_range_init(vaddr, end, swapper_pg_dir);
332
333 kmap_coherent_init();
334
335 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
336 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
337 free_area_init_nodes(max_zone_pfns);
338 }
339
340 unsigned int mem_init_done = 0;
341
342 void __init mem_init(void)
343 {
344 pg_data_t *pgdat;
345
346 high_memory = NULL;
347 for_each_online_pgdat(pgdat)
348 high_memory = max_t(void *, high_memory,
349 __va(pgdat_end_pfn(pgdat) << PAGE_SHIFT));
350
351 memblock_free_all();
352
353 /* Set this up early, so we can take care of the zero page */
354 cpu_cache_init();
355
356 /* clear the zero-page */
357 memset(empty_zero_page, 0, PAGE_SIZE);
358 __flush_wback_region(empty_zero_page, PAGE_SIZE);
359
360 vsyscall_init();
361
362 mem_init_print_info(NULL);
363 pr_info("virtual kernel memory layout:\n"
364 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
365 #ifdef CONFIG_HIGHMEM
366 " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
367 #endif
368 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
369 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n"
370 #ifdef CONFIG_UNCACHED_MAPPING
371 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n"
372 #endif
373 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
374 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
375 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
376 FIXADDR_START, FIXADDR_TOP,
377 (FIXADDR_TOP - FIXADDR_START) >> 10,
378
379 #ifdef CONFIG_HIGHMEM
380 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
381 (LAST_PKMAP*PAGE_SIZE) >> 10,
382 #endif
383
384 (unsigned long)VMALLOC_START, VMALLOC_END,
385 (VMALLOC_END - VMALLOC_START) >> 20,
386
387 (unsigned long)memory_start, (unsigned long)high_memory,
388 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
389
390 #ifdef CONFIG_UNCACHED_MAPPING
391 uncached_start, uncached_end, uncached_size >> 20,
392 #endif
393
394 (unsigned long)&__init_begin, (unsigned long)&__init_end,
395 ((unsigned long)&__init_end -
396 (unsigned long)&__init_begin) >> 10,
397
398 (unsigned long)&_etext, (unsigned long)&_edata,
399 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
400
401 (unsigned long)&_text, (unsigned long)&_etext,
402 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
403
404 mem_init_done = 1;
405 }
406
407 #ifdef CONFIG_MEMORY_HOTPLUG
408 int arch_add_memory(int nid, u64 start, u64 size,
409 struct mhp_restrictions *restrictions)
410 {
411 unsigned long start_pfn = PFN_DOWN(start);
412 unsigned long nr_pages = size >> PAGE_SHIFT;
413 int ret;
414
415 /* We only have ZONE_NORMAL, so this is easy.. */
416 ret = __add_pages(nid, start_pfn, nr_pages, restrictions);
417 if (unlikely(ret))
418 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
419
420 return ret;
421 }
422
423 #ifdef CONFIG_NUMA
424 int memory_add_physaddr_to_nid(u64 addr)
425 {
426 /* Node 0 for now.. */
427 return 0;
428 }
429 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
430 #endif
431
432 void arch_remove_memory(int nid, u64 start, u64 size,
433 struct vmem_altmap *altmap)
434 {
435 unsigned long start_pfn = PFN_DOWN(start);
436 unsigned long nr_pages = size >> PAGE_SHIFT;
437
438 __remove_pages(start_pfn, nr_pages, altmap);
439 }
440 #endif /* CONFIG_MEMORY_HOTPLUG */
Linux with added FPC-III support