1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 /* 2 /*
3 * Provide common bits of early_ioremap() supp 3 * Provide common bits of early_ioremap() support for architectures needing
4 * temporary mappings during boot before iorem 4 * temporary mappings during boot before ioremap() is available.
5 * 5 *
6 * This is mostly a direct copy of the x86 ear 6 * This is mostly a direct copy of the x86 early_ioremap implementation.
7 * 7 *
8 * (C) Copyright 1995 1996, 2014 Linus Torvald 8 * (C) Copyright 1995 1996, 2014 Linus Torvalds
9 * 9 *
10 */ 10 */
11 #include <linux/kernel.h> 11 #include <linux/kernel.h>
12 #include <linux/init.h> 12 #include <linux/init.h>
13 #include <linux/io.h> 13 #include <linux/io.h>
14 #include <linux/module.h> 14 #include <linux/module.h>
15 #include <linux/slab.h> 15 #include <linux/slab.h>
16 #include <linux/mm.h> 16 #include <linux/mm.h>
17 #include <linux/vmalloc.h> 17 #include <linux/vmalloc.h>
18 #include <asm/fixmap.h> 18 #include <asm/fixmap.h>
19 #include <asm/early_ioremap.h> 19 #include <asm/early_ioremap.h>
20 #include "internal.h" 20 #include "internal.h"
21 21
22 #ifdef CONFIG_MMU 22 #ifdef CONFIG_MMU
23 static int early_ioremap_debug __initdata; 23 static int early_ioremap_debug __initdata;
24 24
25 static int __init early_ioremap_debug_setup(ch 25 static int __init early_ioremap_debug_setup(char *str)
26 { 26 {
27 early_ioremap_debug = 1; 27 early_ioremap_debug = 1;
28 28
29 return 0; 29 return 0;
30 } 30 }
31 early_param("early_ioremap_debug", early_iorem 31 early_param("early_ioremap_debug", early_ioremap_debug_setup);
32 32
33 static int after_paging_init __initdata; 33 static int after_paging_init __initdata;
34 34
35 pgprot_t __init __weak early_memremap_pgprot_a 35 pgprot_t __init __weak early_memremap_pgprot_adjust(resource_size_t phys_addr,
36 36 unsigned long size,
37 37 pgprot_t prot)
38 { 38 {
39 return prot; 39 return prot;
40 } 40 }
41 41
42 void __init early_ioremap_reset(void) 42 void __init early_ioremap_reset(void)
43 { 43 {
44 after_paging_init = 1; 44 after_paging_init = 1;
45 } 45 }
46 46
47 /* 47 /*
48 * Generally, ioremap() is available after pag 48 * Generally, ioremap() is available after paging_init() has been called.
49 * Architectures wanting to allow early_iorema 49 * Architectures wanting to allow early_ioremap after paging_init() can
50 * define __late_set_fixmap and __late_clear_f 50 * define __late_set_fixmap and __late_clear_fixmap to do the right thing.
51 */ 51 */
52 #ifndef __late_set_fixmap 52 #ifndef __late_set_fixmap
53 static inline void __init __late_set_fixmap(en 53 static inline void __init __late_set_fixmap(enum fixed_addresses idx,
54 ph 54 phys_addr_t phys, pgprot_t prot)
55 { 55 {
56 BUG(); 56 BUG();
57 } 57 }
58 #endif 58 #endif
59 59
60 #ifndef __late_clear_fixmap 60 #ifndef __late_clear_fixmap
61 static inline void __init __late_clear_fixmap( 61 static inline void __init __late_clear_fixmap(enum fixed_addresses idx)
62 { 62 {
63 BUG(); 63 BUG();
64 } 64 }
65 #endif 65 #endif
66 66
67 static void __iomem *prev_map[FIX_BTMAPS_SLOTS 67 static void __iomem *prev_map[FIX_BTMAPS_SLOTS] __initdata;
68 static unsigned long prev_size[FIX_BTMAPS_SLOT 68 static unsigned long prev_size[FIX_BTMAPS_SLOTS] __initdata;
69 static unsigned long slot_virt[FIX_BTMAPS_SLOT 69 static unsigned long slot_virt[FIX_BTMAPS_SLOTS] __initdata;
70 70
71 void __init early_ioremap_setup(void) 71 void __init early_ioremap_setup(void)
72 { 72 {
73 int i; 73 int i;
74 74
75 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) 75 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) {
76 WARN_ON_ONCE(prev_map[i]); 76 WARN_ON_ONCE(prev_map[i]);
77 slot_virt[i] = __fix_to_virt(F 77 slot_virt[i] = __fix_to_virt(FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*i);
78 } 78 }
79 } 79 }
80 80
81 static int __init check_early_ioremap_leak(voi 81 static int __init check_early_ioremap_leak(void)
82 { 82 {
83 int count = 0; 83 int count = 0;
84 int i; 84 int i;
85 85
86 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) 86 for (i = 0; i < FIX_BTMAPS_SLOTS; i++)
87 if (prev_map[i]) 87 if (prev_map[i])
88 count++; 88 count++;
89 89
90 if (WARN(count, KERN_WARNING 90 if (WARN(count, KERN_WARNING
91 "Debug warning: early ioremap 91 "Debug warning: early ioremap leak of %d areas detected.\n"
92 "please boot with early_iorem 92 "please boot with early_ioremap_debug and report the dmesg.\n",
93 count)) 93 count))
94 return 1; 94 return 1;
95 return 0; 95 return 0;
96 } 96 }
97 late_initcall(check_early_ioremap_leak); 97 late_initcall(check_early_ioremap_leak);
98 98
99 static void __init __iomem * 99 static void __init __iomem *
100 __early_ioremap(resource_size_t phys_addr, uns 100 __early_ioremap(resource_size_t phys_addr, unsigned long size, pgprot_t prot)
101 { 101 {
102 unsigned long offset; 102 unsigned long offset;
103 resource_size_t last_addr; 103 resource_size_t last_addr;
104 unsigned int nrpages; 104 unsigned int nrpages;
105 enum fixed_addresses idx; 105 enum fixed_addresses idx;
106 int i, slot; 106 int i, slot;
107 107
108 WARN_ON(system_state >= SYSTEM_RUNNING 108 WARN_ON(system_state >= SYSTEM_RUNNING);
109 109
110 slot = -1; 110 slot = -1;
111 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) 111 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) {
112 if (!prev_map[i]) { 112 if (!prev_map[i]) {
113 slot = i; 113 slot = i;
114 break; 114 break;
115 } 115 }
116 } 116 }
117 117
118 if (WARN(slot < 0, "%s(%pa, %08lx) not 118 if (WARN(slot < 0, "%s(%pa, %08lx) not found slot\n",
119 __func__, &phys_addr, size)) 119 __func__, &phys_addr, size))
120 return NULL; 120 return NULL;
121 121
122 /* Don't allow wraparound or zero size 122 /* Don't allow wraparound or zero size */
123 last_addr = phys_addr + size - 1; 123 last_addr = phys_addr + size - 1;
124 if (WARN_ON(!size || last_addr < phys_ 124 if (WARN_ON(!size || last_addr < phys_addr))
125 return NULL; 125 return NULL;
126 126
127 prev_size[slot] = size; 127 prev_size[slot] = size;
128 /* 128 /*
129 * Mappings have to be page-aligned 129 * Mappings have to be page-aligned
130 */ 130 */
131 offset = offset_in_page(phys_addr); 131 offset = offset_in_page(phys_addr);
132 phys_addr &= PAGE_MASK; 132 phys_addr &= PAGE_MASK;
133 size = PAGE_ALIGN(last_addr + 1) - phy 133 size = PAGE_ALIGN(last_addr + 1) - phys_addr;
134 134
135 /* 135 /*
136 * Mappings have to fit in the FIX_BTM 136 * Mappings have to fit in the FIX_BTMAP area.
137 */ 137 */
138 nrpages = size >> PAGE_SHIFT; 138 nrpages = size >> PAGE_SHIFT;
139 if (WARN_ON(nrpages > NR_FIX_BTMAPS)) 139 if (WARN_ON(nrpages > NR_FIX_BTMAPS))
140 return NULL; 140 return NULL;
141 141
142 /* 142 /*
143 * Ok, go for it.. 143 * Ok, go for it..
144 */ 144 */
145 idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS* 145 idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*slot;
146 while (nrpages > 0) { 146 while (nrpages > 0) {
147 if (after_paging_init) 147 if (after_paging_init)
148 __late_set_fixmap(idx, 148 __late_set_fixmap(idx, phys_addr, prot);
149 else 149 else
150 __early_set_fixmap(idx 150 __early_set_fixmap(idx, phys_addr, prot);
151 phys_addr += PAGE_SIZE; 151 phys_addr += PAGE_SIZE;
152 --idx; 152 --idx;
153 --nrpages; 153 --nrpages;
154 } 154 }
155 WARN(early_ioremap_debug, "%s(%pa, %08 155 WARN(early_ioremap_debug, "%s(%pa, %08lx) [%d] => %08lx + %08lx\n",
156 __func__, &phys_addr, size, slot, 156 __func__, &phys_addr, size, slot, offset, slot_virt[slot]);
157 157
158 prev_map[slot] = (void __iomem *)(offs 158 prev_map[slot] = (void __iomem *)(offset + slot_virt[slot]);
159 return prev_map[slot]; 159 return prev_map[slot];
160 } 160 }
161 161
162 void __init early_iounmap(void __iomem *addr, 162 void __init early_iounmap(void __iomem *addr, unsigned long size)
163 { 163 {
164 unsigned long virt_addr; 164 unsigned long virt_addr;
165 unsigned long offset; 165 unsigned long offset;
166 unsigned int nrpages; 166 unsigned int nrpages;
167 enum fixed_addresses idx; 167 enum fixed_addresses idx;
168 int i, slot; 168 int i, slot;
169 169
170 slot = -1; 170 slot = -1;
171 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) 171 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) {
172 if (prev_map[i] == addr) { 172 if (prev_map[i] == addr) {
173 slot = i; 173 slot = i;
174 break; 174 break;
175 } 175 }
176 } 176 }
177 177
178 if (WARN(slot < 0, "%s(%p, %08lx) not 178 if (WARN(slot < 0, "%s(%p, %08lx) not found slot\n",
179 __func__, addr, size)) 179 __func__, addr, size))
180 return; 180 return;
181 181
182 if (WARN(prev_size[slot] != size, 182 if (WARN(prev_size[slot] != size,
183 "%s(%p, %08lx) [%d] size not 183 "%s(%p, %08lx) [%d] size not consistent %08lx\n",
184 __func__, addr, size, slot, 184 __func__, addr, size, slot, prev_size[slot]))
185 return; 185 return;
186 186
187 WARN(early_ioremap_debug, "%s(%p, %08l 187 WARN(early_ioremap_debug, "%s(%p, %08lx) [%d]\n",
188 __func__, addr, size, slot); 188 __func__, addr, size, slot);
189 189
190 virt_addr = (unsigned long)addr; 190 virt_addr = (unsigned long)addr;
191 if (WARN_ON(virt_addr < fix_to_virt(FI 191 if (WARN_ON(virt_addr < fix_to_virt(FIX_BTMAP_BEGIN)))
192 return; 192 return;
193 193
194 offset = offset_in_page(virt_addr); 194 offset = offset_in_page(virt_addr);
195 nrpages = PAGE_ALIGN(offset + size) >> 195 nrpages = PAGE_ALIGN(offset + size) >> PAGE_SHIFT;
196 196
197 idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS* 197 idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*slot;
198 while (nrpages > 0) { 198 while (nrpages > 0) {
199 if (after_paging_init) 199 if (after_paging_init)
200 __late_clear_fixmap(id 200 __late_clear_fixmap(idx);
201 else 201 else
202 __early_set_fixmap(idx 202 __early_set_fixmap(idx, 0, FIXMAP_PAGE_CLEAR);
203 --idx; 203 --idx;
204 --nrpages; 204 --nrpages;
205 } 205 }
206 prev_map[slot] = NULL; 206 prev_map[slot] = NULL;
207 } 207 }
208 208
209 /* Remap an IO device */ 209 /* Remap an IO device */
210 void __init __iomem * 210 void __init __iomem *
211 early_ioremap(resource_size_t phys_addr, unsig 211 early_ioremap(resource_size_t phys_addr, unsigned long size)
212 { 212 {
213 return __early_ioremap(phys_addr, size 213 return __early_ioremap(phys_addr, size, FIXMAP_PAGE_IO);
214 } 214 }
215 215
216 /* Remap memory */ 216 /* Remap memory */
217 void __init * 217 void __init *
218 early_memremap(resource_size_t phys_addr, unsi 218 early_memremap(resource_size_t phys_addr, unsigned long size)
219 { 219 {
220 pgprot_t prot = early_memremap_pgprot_ 220 pgprot_t prot = early_memremap_pgprot_adjust(phys_addr, size,
221 221 FIXMAP_PAGE_NORMAL);
222 222
223 return (__force void *)__early_ioremap 223 return (__force void *)__early_ioremap(phys_addr, size, prot);
224 } 224 }
225 #ifdef FIXMAP_PAGE_RO 225 #ifdef FIXMAP_PAGE_RO
226 void __init * 226 void __init *
227 early_memremap_ro(resource_size_t phys_addr, u 227 early_memremap_ro(resource_size_t phys_addr, unsigned long size)
228 { 228 {
229 pgprot_t prot = early_memremap_pgprot_ 229 pgprot_t prot = early_memremap_pgprot_adjust(phys_addr, size,
230 230 FIXMAP_PAGE_RO);
231 231
232 return (__force void *)__early_ioremap 232 return (__force void *)__early_ioremap(phys_addr, size, prot);
233 } 233 }
234 #endif 234 #endif
235 235
236 #ifdef CONFIG_ARCH_USE_MEMREMAP_PROT 236 #ifdef CONFIG_ARCH_USE_MEMREMAP_PROT
237 void __init * 237 void __init *
238 early_memremap_prot(resource_size_t phys_addr, 238 early_memremap_prot(resource_size_t phys_addr, unsigned long size,
239 unsigned long prot_val) 239 unsigned long prot_val)
240 { 240 {
241 return (__force void *)__early_ioremap 241 return (__force void *)__early_ioremap(phys_addr, size,
242 242 __pgprot(prot_val));
243 } 243 }
244 #endif 244 #endif
245 245
246 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE 246 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
247 247
248 void __init copy_from_early_mem(void *dest, ph 248 void __init copy_from_early_mem(void *dest, phys_addr_t src, unsigned long size)
249 { 249 {
250 unsigned long slop, clen; 250 unsigned long slop, clen;
251 char *p; 251 char *p;
252 252
253 while (size) { 253 while (size) {
254 slop = offset_in_page(src); 254 slop = offset_in_page(src);
255 clen = size; 255 clen = size;
256 if (clen > MAX_MAP_CHUNK - slo 256 if (clen > MAX_MAP_CHUNK - slop)
257 clen = MAX_MAP_CHUNK - 257 clen = MAX_MAP_CHUNK - slop;
258 p = early_memremap(src & PAGE_ 258 p = early_memremap(src & PAGE_MASK, clen + slop);
259 memcpy(dest, p + slop, clen); 259 memcpy(dest, p + slop, clen);
260 early_memunmap(p, clen + slop) 260 early_memunmap(p, clen + slop);
261 dest += clen; 261 dest += clen;
262 src += clen; 262 src += clen;
263 size -= clen; 263 size -= clen;
264 } 264 }
265 } 265 }
266 266
267 #else /* CONFIG_MMU */ 267 #else /* CONFIG_MMU */
268 268
269 void __init __iomem * 269 void __init __iomem *
270 early_ioremap(resource_size_t phys_addr, unsig 270 early_ioremap(resource_size_t phys_addr, unsigned long size)
271 { 271 {
272 return (__force void __iomem *)phys_ad 272 return (__force void __iomem *)phys_addr;
273 } 273 }
274 274
275 /* Remap memory */ 275 /* Remap memory */
276 void __init * 276 void __init *
277 early_memremap(resource_size_t phys_addr, unsi 277 early_memremap(resource_size_t phys_addr, unsigned long size)
278 { 278 {
279 return (void *)phys_addr; 279 return (void *)phys_addr;
280 } 280 }
281 void __init * 281 void __init *
282 early_memremap_ro(resource_size_t phys_addr, u 282 early_memremap_ro(resource_size_t phys_addr, unsigned long size)
283 { 283 {
284 return (void *)phys_addr; 284 return (void *)phys_addr;
285 } 285 }
286 286
287 void __init early_iounmap(void __iomem *addr, 287 void __init early_iounmap(void __iomem *addr, unsigned long size)
288 { 288 {
289 } 289 }
290 290
291 #endif /* CONFIG_MMU */ 291 #endif /* CONFIG_MMU */
292 292
293 293
294 void __init early_memunmap(void *addr, unsigne 294 void __init early_memunmap(void *addr, unsigned long size)
295 { 295 {
296 early_iounmap((__force void __iomem *) 296 early_iounmap((__force void __iomem *)addr, size);
297 } 297 }
298 298
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