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83d290c5 1// SPDX-License-Identifier: GPL-2.0+
4ed6552f
KG
2/*
3 * Procedures for maintaining information about logical memory blocks.
4 *
5 * Peter Bergner, IBM Corp. June 2001.
6 * Copyright (C) 2001 Peter Bergner.
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7 */
8
9#include <common.h>
4d72caa5 10#include <image.h>
4ed6552f 11#include <lmb.h>
f7ae49fc 12#include <log.h>
336d4615 13#include <malloc.h>
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14
15#define LMB_ALLOC_ANYWHERE 0
16
358c7789 17static void lmb_dump_region(struct lmb_region *rgn, char *name)
4ed6552f 18{
358c7789
PD
19 unsigned long long base, size, end;
20 enum lmb_flags flags;
21 int i;
4ed6552f 22
358c7789 23 printf(" %s.cnt = 0x%lx\n", name, rgn->cnt);
4ed6552f 24
358c7789
PD
25 for (i = 0; i < rgn->cnt; i++) {
26 base = rgn->region[i].base;
27 size = rgn->region[i].size;
28 end = base + size - 1;
29 flags = rgn->region[i].flags;
30
31 printf(" %s[%d]\t[0x%llx-0x%llx], 0x%08llx bytes flags: %x\n",
32 name, i, base, end, size, flags);
4ed6552f 33 }
9996cea7
TK
34}
35
358c7789
PD
36void lmb_dump_all_force(struct lmb *lmb)
37{
38 printf("lmb_dump_all:\n");
39 lmb_dump_region(&lmb->memory, "memory");
40 lmb_dump_region(&lmb->reserved, "reserved");
41}
42
9996cea7
TK
43void lmb_dump_all(struct lmb *lmb)
44{
45#ifdef DEBUG
46 lmb_dump_all_force(lmb);
47#endif
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48}
49
e35d2a75
SG
50static long lmb_addrs_overlap(phys_addr_t base1, phys_size_t size1,
51 phys_addr_t base2, phys_size_t size2)
4ed6552f 52{
d67f33cf
SG
53 const phys_addr_t base1_end = base1 + size1 - 1;
54 const phys_addr_t base2_end = base2 + size2 - 1;
55
56 return ((base1 <= base2_end) && (base2 <= base1_end));
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KG
57}
58
391fd93a 59static long lmb_addrs_adjacent(phys_addr_t base1, phys_size_t size1,
e35d2a75 60 phys_addr_t base2, phys_size_t size2)
4ed6552f
KG
61{
62 if (base2 == base1 + size1)
63 return 1;
64 else if (base1 == base2 + size2)
65 return -1;
66
67 return 0;
68}
69
e35d2a75
SG
70static long lmb_regions_adjacent(struct lmb_region *rgn, unsigned long r1,
71 unsigned long r2)
4ed6552f 72{
391fd93a
BB
73 phys_addr_t base1 = rgn->region[r1].base;
74 phys_size_t size1 = rgn->region[r1].size;
75 phys_addr_t base2 = rgn->region[r2].base;
76 phys_size_t size2 = rgn->region[r2].size;
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77
78 return lmb_addrs_adjacent(base1, size1, base2, size2);
79}
80
81static void lmb_remove_region(struct lmb_region *rgn, unsigned long r)
82{
83 unsigned long i;
84
85 for (i = r; i < rgn->cnt - 1; i++) {
86 rgn->region[i].base = rgn->region[i + 1].base;
87 rgn->region[i].size = rgn->region[i + 1].size;
59c0ea5d 88 rgn->region[i].flags = rgn->region[i + 1].flags;
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89 }
90 rgn->cnt--;
91}
92
93/* Assumption: base addr of region 1 < base addr of region 2 */
e35d2a75
SG
94static void lmb_coalesce_regions(struct lmb_region *rgn, unsigned long r1,
95 unsigned long r2)
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96{
97 rgn->region[r1].size += rgn->region[r2].size;
98 lmb_remove_region(rgn, r2);
99}
100
101void lmb_init(struct lmb *lmb)
102{
6d66502b 103#if IS_ENABLED(CONFIG_LMB_USE_MAX_REGIONS)
4fa0150d
PD
104 lmb->memory.max = CONFIG_LMB_MAX_REGIONS;
105 lmb->reserved.max = CONFIG_LMB_MAX_REGIONS;
6d66502b
PD
106#else
107 lmb->memory.max = CONFIG_LMB_MEMORY_REGIONS;
108 lmb->reserved.max = CONFIG_LMB_RESERVED_REGIONS;
109 lmb->memory.region = lmb->memory_regions;
110 lmb->reserved.region = lmb->reserved_regions;
111#endif
d67f33cf 112 lmb->memory.cnt = 0;
d67f33cf 113 lmb->reserved.cnt = 0;
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114}
115
9cc2323f 116static void lmb_reserve_common(struct lmb *lmb, void *fdt_blob)
aa3c609e 117{
aa3c609e
SG
118 arch_lmb_reserve(lmb);
119 board_lmb_reserve(lmb);
120
121 if (IMAGE_ENABLE_OF_LIBFDT && fdt_blob)
122 boot_fdt_add_mem_rsv_regions(lmb, fdt_blob);
123}
124
9cc2323f 125/* Initialize the struct, add memory and call arch/board reserve functions */
b75d8dc5 126void lmb_init_and_reserve(struct lmb *lmb, struct bd_info *bd, void *fdt_blob)
9cc2323f 127{
9cc2323f 128 int i;
9cc2323f
SG
129
130 lmb_init(lmb);
dfaf6a57 131
9cc2323f
SG
132 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
133 if (bd->bi_dram[i].size) {
134 lmb_add(lmb, bd->bi_dram[i].start,
135 bd->bi_dram[i].size);
136 }
137 }
dfaf6a57 138
9cc2323f
SG
139 lmb_reserve_common(lmb, fdt_blob);
140}
141
142/* Initialize the struct, add memory and call arch/board reserve functions */
143void lmb_init_and_reserve_range(struct lmb *lmb, phys_addr_t base,
144 phys_size_t size, void *fdt_blob)
145{
146 lmb_init(lmb);
147 lmb_add(lmb, base, size);
148 lmb_reserve_common(lmb, fdt_blob);
149}
150
4ed6552f 151/* This routine called with relocation disabled. */
59c0ea5d
PD
152static long lmb_add_region_flags(struct lmb_region *rgn, phys_addr_t base,
153 phys_size_t size, enum lmb_flags flags)
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KG
154{
155 unsigned long coalesced = 0;
156 long adjacent, i;
157
d67f33cf 158 if (rgn->cnt == 0) {
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159 rgn->region[0].base = base;
160 rgn->region[0].size = size;
59c0ea5d 161 rgn->region[0].flags = flags;
d67f33cf 162 rgn->cnt = 1;
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163 return 0;
164 }
165
166 /* First try and coalesce this LMB with another. */
e35d2a75 167 for (i = 0; i < rgn->cnt; i++) {
391fd93a
BB
168 phys_addr_t rgnbase = rgn->region[i].base;
169 phys_size_t rgnsize = rgn->region[i].size;
59c0ea5d
PD
170 phys_size_t rgnflags = rgn->region[i].flags;
171
172 if (rgnbase == base && rgnsize == size) {
173 if (flags == rgnflags)
174 /* Already have this region, so we're done */
175 return 0;
176 else
177 return -1; /* regions with new flags */
178 }
4ed6552f 179
e35d2a75
SG
180 adjacent = lmb_addrs_adjacent(base, size, rgnbase, rgnsize);
181 if (adjacent > 0) {
59c0ea5d
PD
182 if (flags != rgnflags)
183 break;
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184 rgn->region[i].base -= size;
185 rgn->region[i].size += size;
186 coalesced++;
187 break;
e35d2a75 188 } else if (adjacent < 0) {
59c0ea5d
PD
189 if (flags != rgnflags)
190 break;
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191 rgn->region[i].size += size;
192 coalesced++;
193 break;
0f7c51a6
SG
194 } else if (lmb_addrs_overlap(base, size, rgnbase, rgnsize)) {
195 /* regions overlap */
196 return -1;
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197 }
198 }
199
e35d2a75 200 if ((i < rgn->cnt - 1) && lmb_regions_adjacent(rgn, i, i + 1)) {
59c0ea5d
PD
201 if (rgn->region[i].flags == rgn->region[i + 1].flags) {
202 lmb_coalesce_regions(rgn, i, i + 1);
203 coalesced++;
204 }
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205 }
206
207 if (coalesced)
208 return coalesced;
00fd8dad 209 if (rgn->cnt >= rgn->max)
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210 return -1;
211
212 /* Couldn't coalesce the LMB, so add it to the sorted table. */
213 for (i = rgn->cnt-1; i >= 0; i--) {
214 if (base < rgn->region[i].base) {
e35d2a75
SG
215 rgn->region[i + 1].base = rgn->region[i].base;
216 rgn->region[i + 1].size = rgn->region[i].size;
59c0ea5d 217 rgn->region[i + 1].flags = rgn->region[i].flags;
4ed6552f 218 } else {
e35d2a75
SG
219 rgn->region[i + 1].base = base;
220 rgn->region[i + 1].size = size;
59c0ea5d 221 rgn->region[i + 1].flags = flags;
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222 break;
223 }
224 }
225
226 if (base < rgn->region[0].base) {
227 rgn->region[0].base = base;
228 rgn->region[0].size = size;
59c0ea5d 229 rgn->region[0].flags = flags;
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230 }
231
232 rgn->cnt++;
233
234 return 0;
235}
236
59c0ea5d
PD
237static long lmb_add_region(struct lmb_region *rgn, phys_addr_t base,
238 phys_size_t size)
239{
240 return lmb_add_region_flags(rgn, base, size, LMB_NONE);
241}
242
4ed6552f 243/* This routine may be called with relocation disabled. */
391fd93a 244long lmb_add(struct lmb *lmb, phys_addr_t base, phys_size_t size)
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KG
245{
246 struct lmb_region *_rgn = &(lmb->memory);
247
248 return lmb_add_region(_rgn, base, size);
249}
250
98874ff3 251long lmb_free(struct lmb *lmb, phys_addr_t base, phys_size_t size)
63796c4e
AF
252{
253 struct lmb_region *rgn = &(lmb->reserved);
98874ff3 254 phys_addr_t rgnbegin, rgnend;
d67f33cf 255 phys_addr_t end = base + size - 1;
63796c4e
AF
256 int i;
257
258 rgnbegin = rgnend = 0; /* supress gcc warnings */
259
260 /* Find the region where (base, size) belongs to */
e35d2a75 261 for (i = 0; i < rgn->cnt; i++) {
63796c4e 262 rgnbegin = rgn->region[i].base;
d67f33cf 263 rgnend = rgnbegin + rgn->region[i].size - 1;
63796c4e
AF
264
265 if ((rgnbegin <= base) && (end <= rgnend))
266 break;
267 }
268
269 /* Didn't find the region */
270 if (i == rgn->cnt)
271 return -1;
272
273 /* Check to see if we are removing entire region */
274 if ((rgnbegin == base) && (rgnend == end)) {
275 lmb_remove_region(rgn, i);
276 return 0;
277 }
278
279 /* Check to see if region is matching at the front */
280 if (rgnbegin == base) {
d67f33cf 281 rgn->region[i].base = end + 1;
63796c4e
AF
282 rgn->region[i].size -= size;
283 return 0;
284 }
285
286 /* Check to see if the region is matching at the end */
287 if (rgnend == end) {
288 rgn->region[i].size -= size;
289 return 0;
290 }
291
292 /*
293 * We need to split the entry - adjust the current one to the
294 * beginging of the hole and add the region after hole.
295 */
296 rgn->region[i].size = base - rgn->region[i].base;
59c0ea5d
PD
297 return lmb_add_region_flags(rgn, end + 1, rgnend - end,
298 rgn->region[i].flags);
63796c4e
AF
299}
300
59c0ea5d
PD
301long lmb_reserve_flags(struct lmb *lmb, phys_addr_t base, phys_size_t size,
302 enum lmb_flags flags)
4ed6552f
KG
303{
304 struct lmb_region *_rgn = &(lmb->reserved);
305
59c0ea5d
PD
306 return lmb_add_region_flags(_rgn, base, size, flags);
307}
308
309long lmb_reserve(struct lmb *lmb, phys_addr_t base, phys_size_t size)
310{
311 return lmb_reserve_flags(lmb, base, size, LMB_NONE);
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312}
313
750a6ff4 314static long lmb_overlaps_region(struct lmb_region *rgn, phys_addr_t base,
391fd93a 315 phys_size_t size)
4ed6552f
KG
316{
317 unsigned long i;
318
e35d2a75 319 for (i = 0; i < rgn->cnt; i++) {
391fd93a
BB
320 phys_addr_t rgnbase = rgn->region[i].base;
321 phys_size_t rgnsize = rgn->region[i].size;
e35d2a75 322 if (lmb_addrs_overlap(base, size, rgnbase, rgnsize))
4ed6552f 323 break;
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KG
324 }
325
326 return (i < rgn->cnt) ? i : -1;
327}
328
391fd93a 329phys_addr_t lmb_alloc(struct lmb *lmb, phys_size_t size, ulong align)
4ed6552f
KG
330{
331 return lmb_alloc_base(lmb, size, align, LMB_ALLOC_ANYWHERE);
332}
333
391fd93a 334phys_addr_t lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align, phys_addr_t max_addr)
4ed6552f 335{
391fd93a 336 phys_addr_t alloc;
4ed6552f
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337
338 alloc = __lmb_alloc_base(lmb, size, align, max_addr);
339
340 if (alloc == 0)
341 printf("ERROR: Failed to allocate 0x%lx bytes below 0x%lx.\n",
e35d2a75 342 (ulong)size, (ulong)max_addr);
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343
344 return alloc;
345}
346
391fd93a 347static phys_addr_t lmb_align_down(phys_addr_t addr, phys_size_t size)
4ed6552f
KG
348{
349 return addr & ~(size - 1);
350}
351
391fd93a 352phys_addr_t __lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align, phys_addr_t max_addr)
4ed6552f 353{
e35d2a75 354 long i, rgn;
391fd93a 355 phys_addr_t base = 0;
7570a994 356 phys_addr_t res_base;
4ed6552f 357
e35d2a75 358 for (i = lmb->memory.cnt - 1; i >= 0; i--) {
391fd93a
BB
359 phys_addr_t lmbbase = lmb->memory.region[i].base;
360 phys_size_t lmbsize = lmb->memory.region[i].size;
4ed6552f 361
7570a994
AF
362 if (lmbsize < size)
363 continue;
4ed6552f
KG
364 if (max_addr == LMB_ALLOC_ANYWHERE)
365 base = lmb_align_down(lmbbase + lmbsize - size, align);
366 else if (lmbbase < max_addr) {
ad3fda52
SW
367 base = lmbbase + lmbsize;
368 if (base < lmbbase)
369 base = -1;
370 base = min(base, max_addr);
4ed6552f
KG
371 base = lmb_align_down(base - size, align);
372 } else
373 continue;
374
7570a994 375 while (base && lmbbase <= base) {
e35d2a75
SG
376 rgn = lmb_overlaps_region(&lmb->reserved, base, size);
377 if (rgn < 0) {
7570a994
AF
378 /* This area isn't reserved, take it */
379 if (lmb_add_region(&lmb->reserved, base,
0f7c51a6 380 size) < 0)
7570a994
AF
381 return 0;
382 return base;
383 }
e35d2a75 384 res_base = lmb->reserved.region[rgn].base;
7570a994
AF
385 if (res_base < size)
386 break;
387 base = lmb_align_down(res_base - size, align);
388 }
4ed6552f 389 }
7570a994 390 return 0;
4ed6552f
KG
391}
392
4cc8af80
SG
393/*
394 * Try to allocate a specific address range: must be in defined memory but not
395 * reserved
396 */
397phys_addr_t lmb_alloc_addr(struct lmb *lmb, phys_addr_t base, phys_size_t size)
398{
e35d2a75 399 long rgn;
4cc8af80
SG
400
401 /* Check if the requested address is in one of the memory regions */
e35d2a75
SG
402 rgn = lmb_overlaps_region(&lmb->memory, base, size);
403 if (rgn >= 0) {
4cc8af80
SG
404 /*
405 * Check if the requested end address is in the same memory
406 * region we found.
407 */
e35d2a75
SG
408 if (lmb_addrs_overlap(lmb->memory.region[rgn].base,
409 lmb->memory.region[rgn].size,
410 base + size - 1, 1)) {
4cc8af80
SG
411 /* ok, reserve the memory */
412 if (lmb_reserve(lmb, base, size) >= 0)
413 return base;
414 }
415 }
416 return 0;
417}
418
419/* Return number of bytes from a given address that are free */
65304aad 420phys_size_t lmb_get_free_size(struct lmb *lmb, phys_addr_t addr)
4cc8af80
SG
421{
422 int i;
e35d2a75 423 long rgn;
4cc8af80
SG
424
425 /* check if the requested address is in the memory regions */
e35d2a75
SG
426 rgn = lmb_overlaps_region(&lmb->memory, addr, 1);
427 if (rgn >= 0) {
4cc8af80
SG
428 for (i = 0; i < lmb->reserved.cnt; i++) {
429 if (addr < lmb->reserved.region[i].base) {
430 /* first reserved range > requested address */
431 return lmb->reserved.region[i].base - addr;
432 }
433 if (lmb->reserved.region[i].base +
434 lmb->reserved.region[i].size > addr) {
435 /* requested addr is in this reserved range */
436 return 0;
437 }
438 }
439 /* if we come here: no reserved ranges above requested addr */
440 return lmb->memory.region[lmb->memory.cnt - 1].base +
441 lmb->memory.region[lmb->memory.cnt - 1].size - addr;
442 }
443 return 0;
444}
445
e359a4a5 446int lmb_is_reserved_flags(struct lmb *lmb, phys_addr_t addr, int flags)
4ed6552f
KG
447{
448 int i;
449
450 for (i = 0; i < lmb->reserved.cnt; i++) {
391fd93a 451 phys_addr_t upper = lmb->reserved.region[i].base +
4ed6552f
KG
452 lmb->reserved.region[i].size - 1;
453 if ((addr >= lmb->reserved.region[i].base) && (addr <= upper))
e359a4a5 454 return (lmb->reserved.region[i].flags & flags) == flags;
4ed6552f
KG
455 }
456 return 0;
457}
a16028da 458
e359a4a5
PD
459int lmb_is_reserved(struct lmb *lmb, phys_addr_t addr)
460{
461 return lmb_is_reserved_flags(lmb, addr, LMB_NONE);
462}
463
2c34f3f5 464__weak void board_lmb_reserve(struct lmb *lmb)
a16028da
MF
465{
466 /* please define platform specific board_lmb_reserve() */
467}
a16028da 468
2c34f3f5 469__weak void arch_lmb_reserve(struct lmb *lmb)
a16028da
MF
470{
471 /* please define platform specific arch_lmb_reserve() */
472}
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