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" <<
21 20
22 #ifdef CONFIG_MMU 21 #ifdef CONFIG_MMU
23 static int early_ioremap_debug __initdata; 22 static int early_ioremap_debug __initdata;
24 23
25 static int __init early_ioremap_debug_setup(ch 24 static int __init early_ioremap_debug_setup(char *str)
26 { 25 {
27 early_ioremap_debug = 1; 26 early_ioremap_debug = 1;
28 27
29 return 0; 28 return 0;
30 } 29 }
31 early_param("early_ioremap_debug", early_iorem 30 early_param("early_ioremap_debug", early_ioremap_debug_setup);
32 31
33 static int after_paging_init __initdata; 32 static int after_paging_init __initdata;
34 33
35 pgprot_t __init __weak early_memremap_pgprot_a 34 pgprot_t __init __weak early_memremap_pgprot_adjust(resource_size_t phys_addr,
36 35 unsigned long size,
37 36 pgprot_t prot)
38 { 37 {
39 return prot; 38 return prot;
40 } 39 }
41 40
>> 41 void __init __weak early_ioremap_shutdown(void)
>> 42 {
>> 43 }
>> 44
42 void __init early_ioremap_reset(void) 45 void __init early_ioremap_reset(void)
43 { 46 {
>> 47 early_ioremap_shutdown();
44 after_paging_init = 1; 48 after_paging_init = 1;
45 } 49 }
46 50
47 /* 51 /*
48 * Generally, ioremap() is available after pag 52 * Generally, ioremap() is available after paging_init() has been called.
49 * Architectures wanting to allow early_iorema 53 * Architectures wanting to allow early_ioremap after paging_init() can
50 * define __late_set_fixmap and __late_clear_f 54 * define __late_set_fixmap and __late_clear_fixmap to do the right thing.
51 */ 55 */
52 #ifndef __late_set_fixmap 56 #ifndef __late_set_fixmap
53 static inline void __init __late_set_fixmap(en 57 static inline void __init __late_set_fixmap(enum fixed_addresses idx,
54 ph 58 phys_addr_t phys, pgprot_t prot)
55 { 59 {
56 BUG(); 60 BUG();
57 } 61 }
58 #endif 62 #endif
59 63
60 #ifndef __late_clear_fixmap 64 #ifndef __late_clear_fixmap
61 static inline void __init __late_clear_fixmap( 65 static inline void __init __late_clear_fixmap(enum fixed_addresses idx)
62 { 66 {
63 BUG(); 67 BUG();
64 } 68 }
65 #endif 69 #endif
66 70
67 static void __iomem *prev_map[FIX_BTMAPS_SLOTS 71 static void __iomem *prev_map[FIX_BTMAPS_SLOTS] __initdata;
68 static unsigned long prev_size[FIX_BTMAPS_SLOT 72 static unsigned long prev_size[FIX_BTMAPS_SLOTS] __initdata;
69 static unsigned long slot_virt[FIX_BTMAPS_SLOT 73 static unsigned long slot_virt[FIX_BTMAPS_SLOTS] __initdata;
70 74
71 void __init early_ioremap_setup(void) 75 void __init early_ioremap_setup(void)
72 { 76 {
73 int i; 77 int i;
74 78
75 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) !! 79 for (i = 0; i < FIX_BTMAPS_SLOTS; i++)
76 WARN_ON_ONCE(prev_map[i]); !! 80 if (WARN_ON(prev_map[i]))
>> 81 break;
>> 82
>> 83 for (i = 0; i < FIX_BTMAPS_SLOTS; i++)
77 slot_virt[i] = __fix_to_virt(F 84 slot_virt[i] = __fix_to_virt(FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*i);
78 } <<
79 } 85 }
80 86
81 static int __init check_early_ioremap_leak(voi 87 static int __init check_early_ioremap_leak(void)
82 { 88 {
83 int count = 0; 89 int count = 0;
84 int i; 90 int i;
85 91
86 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) 92 for (i = 0; i < FIX_BTMAPS_SLOTS; i++)
87 if (prev_map[i]) 93 if (prev_map[i])
88 count++; 94 count++;
89 95
90 if (WARN(count, KERN_WARNING 96 if (WARN(count, KERN_WARNING
91 "Debug warning: early ioremap 97 "Debug warning: early ioremap leak of %d areas detected.\n"
92 "please boot with early_iorem 98 "please boot with early_ioremap_debug and report the dmesg.\n",
93 count)) 99 count))
94 return 1; 100 return 1;
95 return 0; 101 return 0;
96 } 102 }
97 late_initcall(check_early_ioremap_leak); 103 late_initcall(check_early_ioremap_leak);
98 104
99 static void __init __iomem * 105 static void __init __iomem *
100 __early_ioremap(resource_size_t phys_addr, uns 106 __early_ioremap(resource_size_t phys_addr, unsigned long size, pgprot_t prot)
101 { 107 {
102 unsigned long offset; 108 unsigned long offset;
103 resource_size_t last_addr; 109 resource_size_t last_addr;
104 unsigned int nrpages; 110 unsigned int nrpages;
105 enum fixed_addresses idx; 111 enum fixed_addresses idx;
106 int i, slot; 112 int i, slot;
107 113
108 WARN_ON(system_state >= SYSTEM_RUNNING 114 WARN_ON(system_state >= SYSTEM_RUNNING);
109 115
110 slot = -1; 116 slot = -1;
111 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) 117 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) {
112 if (!prev_map[i]) { 118 if (!prev_map[i]) {
113 slot = i; 119 slot = i;
114 break; 120 break;
115 } 121 }
116 } 122 }
117 123
118 if (WARN(slot < 0, "%s(%pa, %08lx) not 124 if (WARN(slot < 0, "%s(%pa, %08lx) not found slot\n",
119 __func__, &phys_addr, size)) 125 __func__, &phys_addr, size))
120 return NULL; 126 return NULL;
121 127
122 /* Don't allow wraparound or zero size 128 /* Don't allow wraparound or zero size */
123 last_addr = phys_addr + size - 1; 129 last_addr = phys_addr + size - 1;
124 if (WARN_ON(!size || last_addr < phys_ 130 if (WARN_ON(!size || last_addr < phys_addr))
125 return NULL; 131 return NULL;
126 132
127 prev_size[slot] = size; 133 prev_size[slot] = size;
128 /* 134 /*
129 * Mappings have to be page-aligned 135 * Mappings have to be page-aligned
130 */ 136 */
131 offset = offset_in_page(phys_addr); 137 offset = offset_in_page(phys_addr);
132 phys_addr &= PAGE_MASK; 138 phys_addr &= PAGE_MASK;
133 size = PAGE_ALIGN(last_addr + 1) - phy 139 size = PAGE_ALIGN(last_addr + 1) - phys_addr;
134 140
135 /* 141 /*
136 * Mappings have to fit in the FIX_BTM 142 * Mappings have to fit in the FIX_BTMAP area.
137 */ 143 */
138 nrpages = size >> PAGE_SHIFT; 144 nrpages = size >> PAGE_SHIFT;
139 if (WARN_ON(nrpages > NR_FIX_BTMAPS)) 145 if (WARN_ON(nrpages > NR_FIX_BTMAPS))
140 return NULL; 146 return NULL;
141 147
142 /* 148 /*
143 * Ok, go for it.. 149 * Ok, go for it..
144 */ 150 */
145 idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS* 151 idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*slot;
146 while (nrpages > 0) { 152 while (nrpages > 0) {
147 if (after_paging_init) 153 if (after_paging_init)
148 __late_set_fixmap(idx, 154 __late_set_fixmap(idx, phys_addr, prot);
149 else 155 else
150 __early_set_fixmap(idx 156 __early_set_fixmap(idx, phys_addr, prot);
151 phys_addr += PAGE_SIZE; 157 phys_addr += PAGE_SIZE;
152 --idx; 158 --idx;
153 --nrpages; 159 --nrpages;
154 } 160 }
155 WARN(early_ioremap_debug, "%s(%pa, %08 161 WARN(early_ioremap_debug, "%s(%pa, %08lx) [%d] => %08lx + %08lx\n",
156 __func__, &phys_addr, size, slot, 162 __func__, &phys_addr, size, slot, offset, slot_virt[slot]);
157 163
158 prev_map[slot] = (void __iomem *)(offs 164 prev_map[slot] = (void __iomem *)(offset + slot_virt[slot]);
159 return prev_map[slot]; 165 return prev_map[slot];
160 } 166 }
161 167
162 void __init early_iounmap(void __iomem *addr, 168 void __init early_iounmap(void __iomem *addr, unsigned long size)
163 { 169 {
164 unsigned long virt_addr; 170 unsigned long virt_addr;
165 unsigned long offset; 171 unsigned long offset;
166 unsigned int nrpages; 172 unsigned int nrpages;
167 enum fixed_addresses idx; 173 enum fixed_addresses idx;
168 int i, slot; 174 int i, slot;
169 175
170 slot = -1; 176 slot = -1;
171 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) 177 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) {
172 if (prev_map[i] == addr) { 178 if (prev_map[i] == addr) {
173 slot = i; 179 slot = i;
174 break; 180 break;
175 } 181 }
176 } 182 }
177 183
178 if (WARN(slot < 0, "%s(%p, %08lx) not 184 if (WARN(slot < 0, "%s(%p, %08lx) not found slot\n",
179 __func__, addr, size)) 185 __func__, addr, size))
180 return; 186 return;
181 187
182 if (WARN(prev_size[slot] != size, 188 if (WARN(prev_size[slot] != size,
183 "%s(%p, %08lx) [%d] size not 189 "%s(%p, %08lx) [%d] size not consistent %08lx\n",
184 __func__, addr, size, slot, 190 __func__, addr, size, slot, prev_size[slot]))
185 return; 191 return;
186 192
187 WARN(early_ioremap_debug, "%s(%p, %08l 193 WARN(early_ioremap_debug, "%s(%p, %08lx) [%d]\n",
188 __func__, addr, size, slot); 194 __func__, addr, size, slot);
189 195
190 virt_addr = (unsigned long)addr; 196 virt_addr = (unsigned long)addr;
191 if (WARN_ON(virt_addr < fix_to_virt(FI 197 if (WARN_ON(virt_addr < fix_to_virt(FIX_BTMAP_BEGIN)))
192 return; 198 return;
193 199
194 offset = offset_in_page(virt_addr); 200 offset = offset_in_page(virt_addr);
195 nrpages = PAGE_ALIGN(offset + size) >> 201 nrpages = PAGE_ALIGN(offset + size) >> PAGE_SHIFT;
196 202
197 idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS* 203 idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*slot;
198 while (nrpages > 0) { 204 while (nrpages > 0) {
199 if (after_paging_init) 205 if (after_paging_init)
200 __late_clear_fixmap(id 206 __late_clear_fixmap(idx);
201 else 207 else
202 __early_set_fixmap(idx 208 __early_set_fixmap(idx, 0, FIXMAP_PAGE_CLEAR);
203 --idx; 209 --idx;
204 --nrpages; 210 --nrpages;
205 } 211 }
206 prev_map[slot] = NULL; 212 prev_map[slot] = NULL;
207 } 213 }
208 214
209 /* Remap an IO device */ 215 /* Remap an IO device */
210 void __init __iomem * 216 void __init __iomem *
211 early_ioremap(resource_size_t phys_addr, unsig 217 early_ioremap(resource_size_t phys_addr, unsigned long size)
212 { 218 {
213 return __early_ioremap(phys_addr, size 219 return __early_ioremap(phys_addr, size, FIXMAP_PAGE_IO);
214 } 220 }
215 221
216 /* Remap memory */ 222 /* Remap memory */
217 void __init * 223 void __init *
218 early_memremap(resource_size_t phys_addr, unsi 224 early_memremap(resource_size_t phys_addr, unsigned long size)
219 { 225 {
220 pgprot_t prot = early_memremap_pgprot_ 226 pgprot_t prot = early_memremap_pgprot_adjust(phys_addr, size,
221 227 FIXMAP_PAGE_NORMAL);
222 228
223 return (__force void *)__early_ioremap 229 return (__force void *)__early_ioremap(phys_addr, size, prot);
224 } 230 }
225 #ifdef FIXMAP_PAGE_RO 231 #ifdef FIXMAP_PAGE_RO
226 void __init * 232 void __init *
227 early_memremap_ro(resource_size_t phys_addr, u 233 early_memremap_ro(resource_size_t phys_addr, unsigned long size)
228 { 234 {
229 pgprot_t prot = early_memremap_pgprot_ 235 pgprot_t prot = early_memremap_pgprot_adjust(phys_addr, size,
230 236 FIXMAP_PAGE_RO);
231 237
232 return (__force void *)__early_ioremap 238 return (__force void *)__early_ioremap(phys_addr, size, prot);
233 } 239 }
234 #endif 240 #endif
235 241
236 #ifdef CONFIG_ARCH_USE_MEMREMAP_PROT 242 #ifdef CONFIG_ARCH_USE_MEMREMAP_PROT
237 void __init * 243 void __init *
238 early_memremap_prot(resource_size_t phys_addr, 244 early_memremap_prot(resource_size_t phys_addr, unsigned long size,
239 unsigned long prot_val) 245 unsigned long prot_val)
240 { 246 {
241 return (__force void *)__early_ioremap 247 return (__force void *)__early_ioremap(phys_addr, size,
242 248 __pgprot(prot_val));
243 } 249 }
244 #endif 250 #endif
245 251
246 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE 252 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
247 253
248 void __init copy_from_early_mem(void *dest, ph 254 void __init copy_from_early_mem(void *dest, phys_addr_t src, unsigned long size)
249 { 255 {
250 unsigned long slop, clen; 256 unsigned long slop, clen;
251 char *p; 257 char *p;
252 258
253 while (size) { 259 while (size) {
254 slop = offset_in_page(src); 260 slop = offset_in_page(src);
255 clen = size; 261 clen = size;
256 if (clen > MAX_MAP_CHUNK - slo 262 if (clen > MAX_MAP_CHUNK - slop)
257 clen = MAX_MAP_CHUNK - 263 clen = MAX_MAP_CHUNK - slop;
258 p = early_memremap(src & PAGE_ 264 p = early_memremap(src & PAGE_MASK, clen + slop);
259 memcpy(dest, p + slop, clen); 265 memcpy(dest, p + slop, clen);
260 early_memunmap(p, clen + slop) 266 early_memunmap(p, clen + slop);
261 dest += clen; 267 dest += clen;
262 src += clen; 268 src += clen;
263 size -= clen; 269 size -= clen;
264 } 270 }
265 } 271 }
266 272
267 #else /* CONFIG_MMU */ 273 #else /* CONFIG_MMU */
268 274
269 void __init __iomem * 275 void __init __iomem *
270 early_ioremap(resource_size_t phys_addr, unsig 276 early_ioremap(resource_size_t phys_addr, unsigned long size)
271 { 277 {
272 return (__force void __iomem *)phys_ad 278 return (__force void __iomem *)phys_addr;
273 } 279 }
274 280
275 /* Remap memory */ 281 /* Remap memory */
276 void __init * 282 void __init *
277 early_memremap(resource_size_t phys_addr, unsi 283 early_memremap(resource_size_t phys_addr, unsigned long size)
278 { 284 {
279 return (void *)phys_addr; 285 return (void *)phys_addr;
280 } 286 }
281 void __init * 287 void __init *
282 early_memremap_ro(resource_size_t phys_addr, u 288 early_memremap_ro(resource_size_t phys_addr, unsigned long size)
283 { 289 {
284 return (void *)phys_addr; 290 return (void *)phys_addr;
285 } 291 }
286 292
287 void __init early_iounmap(void __iomem *addr, 293 void __init early_iounmap(void __iomem *addr, unsigned long size)
288 { 294 {
289 } 295 }
290 296
291 #endif /* CONFIG_MMU */ 297 #endif /* CONFIG_MMU */
292 298
293 299
294 void __init early_memunmap(void *addr, unsigne 300 void __init early_memunmap(void *addr, unsigned long size)
295 { 301 {
296 early_iounmap((__force void __iomem *) 302 early_iounmap((__force void __iomem *)addr, size);
297 } 303 }
298 304
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