1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Procedures for maintaining information about logical memory blocks. 4 * 5 * Peter Bergner, IBM Corp. June 2001. 6 * Copyright (C) 2001 Peter Bergner. 7 */ 8 9 #include <common.h> 10 #include <lmb.h> 11 12 #define LMB_ALLOC_ANYWHERE 0 13 14 void lmb_dump_all(struct lmb *lmb) 15 { 16 #ifdef DEBUG 17 unsigned long i; 18 19 debug("lmb_dump_all:\n"); 20 debug(" memory.cnt = 0x%lx\n", lmb->memory.cnt); 21 debug(" memory.size = 0x%llx\n", 22 (unsigned long long)lmb->memory.size); 23 for (i=0; i < lmb->memory.cnt ;i++) { 24 debug(" memory.reg[0x%lx].base = 0x%llx\n", i, 25 (long long unsigned)lmb->memory.region[i].base); 26 debug(" .size = 0x%llx\n", 27 (long long unsigned)lmb->memory.region[i].size); 28 } 29 30 debug("\n reserved.cnt = 0x%lx\n", 31 lmb->reserved.cnt); 32 debug(" reserved.size = 0x%llx\n", 33 (long long unsigned)lmb->reserved.size); 34 for (i=0; i < lmb->reserved.cnt ;i++) { 35 debug(" reserved.reg[0x%lx].base = 0x%llx\n", i, 36 (long long unsigned)lmb->reserved.region[i].base); 37 debug(" .size = 0x%llx\n", 38 (long long unsigned)lmb->reserved.region[i].size); 39 } 40 #endif /* DEBUG */ 41 } 42 43 static long lmb_addrs_overlap(phys_addr_t base1, 44 phys_size_t size1, phys_addr_t base2, phys_size_t size2) 45 { 46 const phys_addr_t base1_end = base1 + size1 - 1; 47 const phys_addr_t base2_end = base2 + size2 - 1; 48 49 return ((base1 <= base2_end) && (base2 <= base1_end)); 50 } 51 52 static long lmb_addrs_adjacent(phys_addr_t base1, phys_size_t size1, 53 phys_addr_t base2, phys_size_t size2) 54 { 55 if (base2 == base1 + size1) 56 return 1; 57 else if (base1 == base2 + size2) 58 return -1; 59 60 return 0; 61 } 62 63 static long lmb_regions_adjacent(struct lmb_region *rgn, 64 unsigned long r1, unsigned long r2) 65 { 66 phys_addr_t base1 = rgn->region[r1].base; 67 phys_size_t size1 = rgn->region[r1].size; 68 phys_addr_t base2 = rgn->region[r2].base; 69 phys_size_t size2 = rgn->region[r2].size; 70 71 return lmb_addrs_adjacent(base1, size1, base2, size2); 72 } 73 74 static void lmb_remove_region(struct lmb_region *rgn, unsigned long r) 75 { 76 unsigned long i; 77 78 for (i = r; i < rgn->cnt - 1; i++) { 79 rgn->region[i].base = rgn->region[i + 1].base; 80 rgn->region[i].size = rgn->region[i + 1].size; 81 } 82 rgn->cnt--; 83 } 84 85 /* Assumption: base addr of region 1 < base addr of region 2 */ 86 static void lmb_coalesce_regions(struct lmb_region *rgn, 87 unsigned long r1, unsigned long r2) 88 { 89 rgn->region[r1].size += rgn->region[r2].size; 90 lmb_remove_region(rgn, r2); 91 } 92 93 void lmb_init(struct lmb *lmb) 94 { 95 lmb->memory.cnt = 0; 96 lmb->memory.size = 0; 97 lmb->reserved.cnt = 0; 98 lmb->reserved.size = 0; 99 } 100 101 /* This routine called with relocation disabled. */ 102 static long lmb_add_region(struct lmb_region *rgn, phys_addr_t base, phys_size_t size) 103 { 104 unsigned long coalesced = 0; 105 long adjacent, i; 106 107 if (rgn->cnt == 0) { 108 rgn->region[0].base = base; 109 rgn->region[0].size = size; 110 rgn->cnt = 1; 111 return 0; 112 } 113 114 /* First try and coalesce this LMB with another. */ 115 for (i=0; i < rgn->cnt; i++) { 116 phys_addr_t rgnbase = rgn->region[i].base; 117 phys_size_t rgnsize = rgn->region[i].size; 118 119 if ((rgnbase == base) && (rgnsize == size)) 120 /* Already have this region, so we're done */ 121 return 0; 122 123 adjacent = lmb_addrs_adjacent(base,size,rgnbase,rgnsize); 124 if ( adjacent > 0 ) { 125 rgn->region[i].base -= size; 126 rgn->region[i].size += size; 127 coalesced++; 128 break; 129 } 130 else if ( adjacent < 0 ) { 131 rgn->region[i].size += size; 132 coalesced++; 133 break; 134 } else if (lmb_addrs_overlap(base, size, rgnbase, rgnsize)) { 135 /* regions overlap */ 136 return -1; 137 } 138 } 139 140 if ((i < rgn->cnt-1) && lmb_regions_adjacent(rgn, i, i+1) ) { 141 lmb_coalesce_regions(rgn, i, i+1); 142 coalesced++; 143 } 144 145 if (coalesced) 146 return coalesced; 147 if (rgn->cnt >= MAX_LMB_REGIONS) 148 return -1; 149 150 /* Couldn't coalesce the LMB, so add it to the sorted table. */ 151 for (i = rgn->cnt-1; i >= 0; i--) { 152 if (base < rgn->region[i].base) { 153 rgn->region[i+1].base = rgn->region[i].base; 154 rgn->region[i+1].size = rgn->region[i].size; 155 } else { 156 rgn->region[i+1].base = base; 157 rgn->region[i+1].size = size; 158 break; 159 } 160 } 161 162 if (base < rgn->region[0].base) { 163 rgn->region[0].base = base; 164 rgn->region[0].size = size; 165 } 166 167 rgn->cnt++; 168 169 return 0; 170 } 171 172 /* This routine may be called with relocation disabled. */ 173 long lmb_add(struct lmb *lmb, phys_addr_t base, phys_size_t size) 174 { 175 struct lmb_region *_rgn = &(lmb->memory); 176 177 return lmb_add_region(_rgn, base, size); 178 } 179 180 long lmb_free(struct lmb *lmb, phys_addr_t base, phys_size_t size) 181 { 182 struct lmb_region *rgn = &(lmb->reserved); 183 phys_addr_t rgnbegin, rgnend; 184 phys_addr_t end = base + size - 1; 185 int i; 186 187 rgnbegin = rgnend = 0; /* supress gcc warnings */ 188 189 /* Find the region where (base, size) belongs to */ 190 for (i=0; i < rgn->cnt; i++) { 191 rgnbegin = rgn->region[i].base; 192 rgnend = rgnbegin + rgn->region[i].size - 1; 193 194 if ((rgnbegin <= base) && (end <= rgnend)) 195 break; 196 } 197 198 /* Didn't find the region */ 199 if (i == rgn->cnt) 200 return -1; 201 202 /* Check to see if we are removing entire region */ 203 if ((rgnbegin == base) && (rgnend == end)) { 204 lmb_remove_region(rgn, i); 205 return 0; 206 } 207 208 /* Check to see if region is matching at the front */ 209 if (rgnbegin == base) { 210 rgn->region[i].base = end + 1; 211 rgn->region[i].size -= size; 212 return 0; 213 } 214 215 /* Check to see if the region is matching at the end */ 216 if (rgnend == end) { 217 rgn->region[i].size -= size; 218 return 0; 219 } 220 221 /* 222 * We need to split the entry - adjust the current one to the 223 * beginging of the hole and add the region after hole. 224 */ 225 rgn->region[i].size = base - rgn->region[i].base; 226 return lmb_add_region(rgn, end + 1, rgnend - end); 227 } 228 229 long lmb_reserve(struct lmb *lmb, phys_addr_t base, phys_size_t size) 230 { 231 struct lmb_region *_rgn = &(lmb->reserved); 232 233 return lmb_add_region(_rgn, base, size); 234 } 235 236 static long lmb_overlaps_region(struct lmb_region *rgn, phys_addr_t base, 237 phys_size_t size) 238 { 239 unsigned long i; 240 241 for (i=0; i < rgn->cnt; i++) { 242 phys_addr_t rgnbase = rgn->region[i].base; 243 phys_size_t rgnsize = rgn->region[i].size; 244 if ( lmb_addrs_overlap(base,size,rgnbase,rgnsize) ) { 245 break; 246 } 247 } 248 249 return (i < rgn->cnt) ? i : -1; 250 } 251 252 phys_addr_t lmb_alloc(struct lmb *lmb, phys_size_t size, ulong align) 253 { 254 return lmb_alloc_base(lmb, size, align, LMB_ALLOC_ANYWHERE); 255 } 256 257 phys_addr_t lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align, phys_addr_t max_addr) 258 { 259 phys_addr_t alloc; 260 261 alloc = __lmb_alloc_base(lmb, size, align, max_addr); 262 263 if (alloc == 0) 264 printf("ERROR: Failed to allocate 0x%lx bytes below 0x%lx.\n", 265 (ulong)size, (ulong)max_addr); 266 267 return alloc; 268 } 269 270 static phys_addr_t lmb_align_down(phys_addr_t addr, phys_size_t size) 271 { 272 return addr & ~(size - 1); 273 } 274 275 phys_addr_t __lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align, phys_addr_t max_addr) 276 { 277 long i, j; 278 phys_addr_t base = 0; 279 phys_addr_t res_base; 280 281 for (i = lmb->memory.cnt-1; i >= 0; i--) { 282 phys_addr_t lmbbase = lmb->memory.region[i].base; 283 phys_size_t lmbsize = lmb->memory.region[i].size; 284 285 if (lmbsize < size) 286 continue; 287 if (max_addr == LMB_ALLOC_ANYWHERE) 288 base = lmb_align_down(lmbbase + lmbsize - size, align); 289 else if (lmbbase < max_addr) { 290 base = lmbbase + lmbsize; 291 if (base < lmbbase) 292 base = -1; 293 base = min(base, max_addr); 294 base = lmb_align_down(base - size, align); 295 } else 296 continue; 297 298 while (base && lmbbase <= base) { 299 j = lmb_overlaps_region(&lmb->reserved, base, size); 300 if (j < 0) { 301 /* This area isn't reserved, take it */ 302 if (lmb_add_region(&lmb->reserved, base, 303 size) < 0) 304 return 0; 305 return base; 306 } 307 res_base = lmb->reserved.region[j].base; 308 if (res_base < size) 309 break; 310 base = lmb_align_down(res_base - size, align); 311 } 312 } 313 return 0; 314 } 315 316 int lmb_is_reserved(struct lmb *lmb, phys_addr_t addr) 317 { 318 int i; 319 320 for (i = 0; i < lmb->reserved.cnt; i++) { 321 phys_addr_t upper = lmb->reserved.region[i].base + 322 lmb->reserved.region[i].size - 1; 323 if ((addr >= lmb->reserved.region[i].base) && (addr <= upper)) 324 return 1; 325 } 326 return 0; 327 } 328 329 __weak void board_lmb_reserve(struct lmb *lmb) 330 { 331 /* please define platform specific board_lmb_reserve() */ 332 } 333 334 __weak void arch_lmb_reserve(struct lmb *lmb) 335 { 336 /* please define platform specific arch_lmb_reserve() */ 337 } 338