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 if (WARN_ON(prev_map[i]))
>> 77 break;
>> 78
>> 79 for (i = 0; i < FIX_BTMAPS_SLOTS; i++)
77 slot_virt[i] = __fix_to_virt(F 80 slot_virt[i] = __fix_to_virt(FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*i);
78 } <<
79 } 81 }
80 82
81 static int __init check_early_ioremap_leak(voi 83 static int __init check_early_ioremap_leak(void)
82 { 84 {
83 int count = 0; 85 int count = 0;
84 int i; 86 int i;
85 87
86 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) 88 for (i = 0; i < FIX_BTMAPS_SLOTS; i++)
87 if (prev_map[i]) 89 if (prev_map[i])
88 count++; 90 count++;
89 91
90 if (WARN(count, KERN_WARNING 92 if (WARN(count, KERN_WARNING
91 "Debug warning: early ioremap 93 "Debug warning: early ioremap leak of %d areas detected.\n"
92 "please boot with early_iorem 94 "please boot with early_ioremap_debug and report the dmesg.\n",
93 count)) 95 count))
94 return 1; 96 return 1;
95 return 0; 97 return 0;
96 } 98 }
97 late_initcall(check_early_ioremap_leak); 99 late_initcall(check_early_ioremap_leak);
98 100
99 static void __init __iomem * 101 static void __init __iomem *
100 __early_ioremap(resource_size_t phys_addr, uns 102 __early_ioremap(resource_size_t phys_addr, unsigned long size, pgprot_t prot)
101 { 103 {
102 unsigned long offset; 104 unsigned long offset;
103 resource_size_t last_addr; 105 resource_size_t last_addr;
104 unsigned int nrpages; 106 unsigned int nrpages;
105 enum fixed_addresses idx; 107 enum fixed_addresses idx;
106 int i, slot; 108 int i, slot;
107 109
108 WARN_ON(system_state >= SYSTEM_RUNNING 110 WARN_ON(system_state >= SYSTEM_RUNNING);
109 111
110 slot = -1; 112 slot = -1;
111 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) 113 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) {
112 if (!prev_map[i]) { 114 if (!prev_map[i]) {
113 slot = i; 115 slot = i;
114 break; 116 break;
115 } 117 }
116 } 118 }
117 119
118 if (WARN(slot < 0, "%s(%pa, %08lx) not 120 if (WARN(slot < 0, "%s(%pa, %08lx) not found slot\n",
119 __func__, &phys_addr, size)) 121 __func__, &phys_addr, size))
120 return NULL; 122 return NULL;
121 123
122 /* Don't allow wraparound or zero size 124 /* Don't allow wraparound or zero size */
123 last_addr = phys_addr + size - 1; 125 last_addr = phys_addr + size - 1;
124 if (WARN_ON(!size || last_addr < phys_ 126 if (WARN_ON(!size || last_addr < phys_addr))
125 return NULL; 127 return NULL;
126 128
127 prev_size[slot] = size; 129 prev_size[slot] = size;
128 /* 130 /*
129 * Mappings have to be page-aligned 131 * Mappings have to be page-aligned
130 */ 132 */
131 offset = offset_in_page(phys_addr); 133 offset = offset_in_page(phys_addr);
132 phys_addr &= PAGE_MASK; 134 phys_addr &= PAGE_MASK;
133 size = PAGE_ALIGN(last_addr + 1) - phy 135 size = PAGE_ALIGN(last_addr + 1) - phys_addr;
134 136
135 /* 137 /*
136 * Mappings have to fit in the FIX_BTM 138 * Mappings have to fit in the FIX_BTMAP area.
137 */ 139 */
138 nrpages = size >> PAGE_SHIFT; 140 nrpages = size >> PAGE_SHIFT;
139 if (WARN_ON(nrpages > NR_FIX_BTMAPS)) 141 if (WARN_ON(nrpages > NR_FIX_BTMAPS))
140 return NULL; 142 return NULL;
141 143
142 /* 144 /*
143 * Ok, go for it.. 145 * Ok, go for it..
144 */ 146 */
145 idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS* 147 idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*slot;
146 while (nrpages > 0) { 148 while (nrpages > 0) {
147 if (after_paging_init) 149 if (after_paging_init)
148 __late_set_fixmap(idx, 150 __late_set_fixmap(idx, phys_addr, prot);
149 else 151 else
150 __early_set_fixmap(idx 152 __early_set_fixmap(idx, phys_addr, prot);
151 phys_addr += PAGE_SIZE; 153 phys_addr += PAGE_SIZE;
152 --idx; 154 --idx;
153 --nrpages; 155 --nrpages;
154 } 156 }
155 WARN(early_ioremap_debug, "%s(%pa, %08 157 WARN(early_ioremap_debug, "%s(%pa, %08lx) [%d] => %08lx + %08lx\n",
156 __func__, &phys_addr, size, slot, 158 __func__, &phys_addr, size, slot, offset, slot_virt[slot]);
157 159
158 prev_map[slot] = (void __iomem *)(offs 160 prev_map[slot] = (void __iomem *)(offset + slot_virt[slot]);
159 return prev_map[slot]; 161 return prev_map[slot];
160 } 162 }
161 163
162 void __init early_iounmap(void __iomem *addr, 164 void __init early_iounmap(void __iomem *addr, unsigned long size)
163 { 165 {
164 unsigned long virt_addr; 166 unsigned long virt_addr;
165 unsigned long offset; 167 unsigned long offset;
166 unsigned int nrpages; 168 unsigned int nrpages;
167 enum fixed_addresses idx; 169 enum fixed_addresses idx;
168 int i, slot; 170 int i, slot;
169 171
170 slot = -1; 172 slot = -1;
171 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) 173 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) {
172 if (prev_map[i] == addr) { 174 if (prev_map[i] == addr) {
173 slot = i; 175 slot = i;
174 break; 176 break;
175 } 177 }
176 } 178 }
177 179
178 if (WARN(slot < 0, "%s(%p, %08lx) not 180 if (WARN(slot < 0, "%s(%p, %08lx) not found slot\n",
179 __func__, addr, size)) 181 __func__, addr, size))
180 return; 182 return;
181 183
182 if (WARN(prev_size[slot] != size, 184 if (WARN(prev_size[slot] != size,
183 "%s(%p, %08lx) [%d] size not 185 "%s(%p, %08lx) [%d] size not consistent %08lx\n",
184 __func__, addr, size, slot, 186 __func__, addr, size, slot, prev_size[slot]))
185 return; 187 return;
186 188
187 WARN(early_ioremap_debug, "%s(%p, %08l 189 WARN(early_ioremap_debug, "%s(%p, %08lx) [%d]\n",
188 __func__, addr, size, slot); 190 __func__, addr, size, slot);
189 191
190 virt_addr = (unsigned long)addr; 192 virt_addr = (unsigned long)addr;
191 if (WARN_ON(virt_addr < fix_to_virt(FI 193 if (WARN_ON(virt_addr < fix_to_virt(FIX_BTMAP_BEGIN)))
192 return; 194 return;
193 195
194 offset = offset_in_page(virt_addr); 196 offset = offset_in_page(virt_addr);
195 nrpages = PAGE_ALIGN(offset + size) >> 197 nrpages = PAGE_ALIGN(offset + size) >> PAGE_SHIFT;
196 198
197 idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS* 199 idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*slot;
198 while (nrpages > 0) { 200 while (nrpages > 0) {
199 if (after_paging_init) 201 if (after_paging_init)
200 __late_clear_fixmap(id 202 __late_clear_fixmap(idx);
201 else 203 else
202 __early_set_fixmap(idx 204 __early_set_fixmap(idx, 0, FIXMAP_PAGE_CLEAR);
203 --idx; 205 --idx;
204 --nrpages; 206 --nrpages;
205 } 207 }
206 prev_map[slot] = NULL; 208 prev_map[slot] = NULL;
207 } 209 }
208 210
209 /* Remap an IO device */ 211 /* Remap an IO device */
210 void __init __iomem * 212 void __init __iomem *
211 early_ioremap(resource_size_t phys_addr, unsig 213 early_ioremap(resource_size_t phys_addr, unsigned long size)
212 { 214 {
213 return __early_ioremap(phys_addr, size 215 return __early_ioremap(phys_addr, size, FIXMAP_PAGE_IO);
214 } 216 }
215 217
216 /* Remap memory */ 218 /* Remap memory */
217 void __init * 219 void __init *
218 early_memremap(resource_size_t phys_addr, unsi 220 early_memremap(resource_size_t phys_addr, unsigned long size)
219 { 221 {
220 pgprot_t prot = early_memremap_pgprot_ 222 pgprot_t prot = early_memremap_pgprot_adjust(phys_addr, size,
221 223 FIXMAP_PAGE_NORMAL);
222 224
223 return (__force void *)__early_ioremap 225 return (__force void *)__early_ioremap(phys_addr, size, prot);
224 } 226 }
225 #ifdef FIXMAP_PAGE_RO 227 #ifdef FIXMAP_PAGE_RO
226 void __init * 228 void __init *
227 early_memremap_ro(resource_size_t phys_addr, u 229 early_memremap_ro(resource_size_t phys_addr, unsigned long size)
228 { 230 {
229 pgprot_t prot = early_memremap_pgprot_ 231 pgprot_t prot = early_memremap_pgprot_adjust(phys_addr, size,
230 232 FIXMAP_PAGE_RO);
231 233
232 return (__force void *)__early_ioremap 234 return (__force void *)__early_ioremap(phys_addr, size, prot);
233 } 235 }
234 #endif 236 #endif
235 237
236 #ifdef CONFIG_ARCH_USE_MEMREMAP_PROT 238 #ifdef CONFIG_ARCH_USE_MEMREMAP_PROT
237 void __init * 239 void __init *
238 early_memremap_prot(resource_size_t phys_addr, 240 early_memremap_prot(resource_size_t phys_addr, unsigned long size,
239 unsigned long prot_val) 241 unsigned long prot_val)
240 { 242 {
241 return (__force void *)__early_ioremap 243 return (__force void *)__early_ioremap(phys_addr, size,
242 244 __pgprot(prot_val));
243 } 245 }
244 #endif 246 #endif
245 247
246 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE 248 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
247 249
248 void __init copy_from_early_mem(void *dest, ph 250 void __init copy_from_early_mem(void *dest, phys_addr_t src, unsigned long size)
249 { 251 {
250 unsigned long slop, clen; 252 unsigned long slop, clen;
251 char *p; 253 char *p;
252 254
253 while (size) { 255 while (size) {
254 slop = offset_in_page(src); 256 slop = offset_in_page(src);
255 clen = size; 257 clen = size;
256 if (clen > MAX_MAP_CHUNK - slo 258 if (clen > MAX_MAP_CHUNK - slop)
257 clen = MAX_MAP_CHUNK - 259 clen = MAX_MAP_CHUNK - slop;
258 p = early_memremap(src & PAGE_ 260 p = early_memremap(src & PAGE_MASK, clen + slop);
259 memcpy(dest, p + slop, clen); 261 memcpy(dest, p + slop, clen);
260 early_memunmap(p, clen + slop) 262 early_memunmap(p, clen + slop);
261 dest += clen; 263 dest += clen;
262 src += clen; 264 src += clen;
263 size -= clen; 265 size -= clen;
264 } 266 }
265 } 267 }
266 268
267 #else /* CONFIG_MMU */ 269 #else /* CONFIG_MMU */
268 270
269 void __init __iomem * 271 void __init __iomem *
270 early_ioremap(resource_size_t phys_addr, unsig 272 early_ioremap(resource_size_t phys_addr, unsigned long size)
271 { 273 {
272 return (__force void __iomem *)phys_ad 274 return (__force void __iomem *)phys_addr;
273 } 275 }
274 276
275 /* Remap memory */ 277 /* Remap memory */
276 void __init * 278 void __init *
277 early_memremap(resource_size_t phys_addr, unsi 279 early_memremap(resource_size_t phys_addr, unsigned long size)
278 { 280 {
279 return (void *)phys_addr; 281 return (void *)phys_addr;
280 } 282 }
281 void __init * 283 void __init *
282 early_memremap_ro(resource_size_t phys_addr, u 284 early_memremap_ro(resource_size_t phys_addr, unsigned long size)
283 { 285 {
284 return (void *)phys_addr; 286 return (void *)phys_addr;
285 } 287 }
286 288
287 void __init early_iounmap(void __iomem *addr, 289 void __init early_iounmap(void __iomem *addr, unsigned long size)
288 { 290 {
289 } 291 }
290 292
291 #endif /* CONFIG_MMU */ 293 #endif /* CONFIG_MMU */
292 294
293 295
294 void __init early_memunmap(void *addr, unsigne 296 void __init early_memunmap(void *addr, unsigned long size)
295 { 297 {
296 early_iounmap((__force void __iomem *) 298 early_iounmap((__force void __iomem *)addr, size);
297 } 299 }
298 300
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.