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dehash.c
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linux-6.19.14/drivers/ras/amd/atl/dehash.c
1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * AMD Address Translation Library 4 * 5 * dehash.c : Functions to account for hashing bits 6 * 7 * Copyright (c) 2023, Advanced Micro Devices, Inc. 8 * All Rights Reserved. 9 * 10 * Author: Yazen Ghannam <Yazen.Ghannam@amd.com> 11 */ 12 13#include "internal.h" 14 15static int df2_dehash_addr(struct addr_ctx *ctx) 16{ 17 u8 hashed_bit, intlv_bit, intlv_bit_pos; 18 19 intlv_bit_pos = ctx->map.intlv_bit_pos; 20 intlv_bit = !!(BIT_ULL(intlv_bit_pos) & ctx->ret_addr); 21 22 hashed_bit = intlv_bit; 23 hashed_bit ^= FIELD_GET(BIT_ULL(12), ctx->ret_addr); 24 hashed_bit ^= FIELD_GET(BIT_ULL(18), ctx->ret_addr); 25 hashed_bit ^= FIELD_GET(BIT_ULL(21), ctx->ret_addr); 26 hashed_bit ^= FIELD_GET(BIT_ULL(30), ctx->ret_addr); 27 28 if (hashed_bit != intlv_bit) 29 ctx->ret_addr ^= BIT_ULL(intlv_bit_pos); 30 31 return 0; 32} 33 34static int df3_dehash_addr(struct addr_ctx *ctx) 35{ 36 bool hash_ctl_64k, hash_ctl_2M, hash_ctl_1G; 37 u8 hashed_bit, intlv_bit, intlv_bit_pos; 38 39 hash_ctl_64k = FIELD_GET(DF3_HASH_CTL_64K, ctx->map.ctl); 40 hash_ctl_2M = FIELD_GET(DF3_HASH_CTL_2M, ctx->map.ctl); 41 hash_ctl_1G = FIELD_GET(DF3_HASH_CTL_1G, ctx->map.ctl); 42 43 intlv_bit_pos = ctx->map.intlv_bit_pos; 44 intlv_bit = !!(BIT_ULL(intlv_bit_pos) & ctx->ret_addr); 45 46 hashed_bit = intlv_bit; 47 hashed_bit ^= FIELD_GET(BIT_ULL(14), ctx->ret_addr); 48 hashed_bit ^= FIELD_GET(BIT_ULL(18), ctx->ret_addr) & hash_ctl_64k; 49 hashed_bit ^= FIELD_GET(BIT_ULL(23), ctx->ret_addr) & hash_ctl_2M; 50 hashed_bit ^= FIELD_GET(BIT_ULL(32), ctx->ret_addr) & hash_ctl_1G; 51 52 if (hashed_bit != intlv_bit) 53 ctx->ret_addr ^= BIT_ULL(intlv_bit_pos); 54 55 /* Calculation complete for 2 channels. Continue for 4 and 8 channels. */ 56 if (ctx->map.intlv_mode == DF3_COD4_2CHAN_HASH) 57 return 0; 58 59 intlv_bit = FIELD_GET(BIT_ULL(12), ctx->ret_addr); 60 61 hashed_bit = intlv_bit; 62 hashed_bit ^= FIELD_GET(BIT_ULL(16), ctx->ret_addr) & hash_ctl_64k; 63 hashed_bit ^= FIELD_GET(BIT_ULL(21), ctx->ret_addr) & hash_ctl_2M; 64 hashed_bit ^= FIELD_GET(BIT_ULL(30), ctx->ret_addr) & hash_ctl_1G; 65 66 if (hashed_bit != intlv_bit) 67 ctx->ret_addr ^= BIT_ULL(12); 68 69 /* Calculation complete for 4 channels. Continue for 8 channels. */ 70 if (ctx->map.intlv_mode == DF3_COD2_4CHAN_HASH) 71 return 0; 72 73 intlv_bit = FIELD_GET(BIT_ULL(13), ctx->ret_addr); 74 75 hashed_bit = intlv_bit; 76 hashed_bit ^= FIELD_GET(BIT_ULL(17), ctx->ret_addr) & hash_ctl_64k; 77 hashed_bit ^= FIELD_GET(BIT_ULL(22), ctx->ret_addr) & hash_ctl_2M; 78 hashed_bit ^= FIELD_GET(BIT_ULL(31), ctx->ret_addr) & hash_ctl_1G; 79 80 if (hashed_bit != intlv_bit) 81 ctx->ret_addr ^= BIT_ULL(13); 82 83 return 0; 84} 85 86static int df3_6chan_dehash_addr(struct addr_ctx *ctx) 87{ 88 u8 intlv_bit_pos = ctx->map.intlv_bit_pos; 89 u8 hashed_bit, intlv_bit, num_intlv_bits; 90 bool hash_ctl_2M, hash_ctl_1G; 91 92 if (ctx->map.intlv_mode != DF3_6CHAN) { 93 atl_debug_on_bad_intlv_mode(ctx); 94 return -EINVAL; 95 } 96 97 num_intlv_bits = ilog2(ctx->map.num_intlv_chan) + 1; 98 99 hash_ctl_2M = FIELD_GET(DF3_HASH_CTL_2M, ctx->map.ctl); 100 hash_ctl_1G = FIELD_GET(DF3_HASH_CTL_1G, ctx->map.ctl); 101 102 intlv_bit = !!(BIT_ULL(intlv_bit_pos) & ctx->ret_addr); 103 104 hashed_bit = intlv_bit; 105 hashed_bit ^= !!(BIT_ULL(intlv_bit_pos + num_intlv_bits) & ctx->ret_addr); 106 hashed_bit ^= FIELD_GET(BIT_ULL(23), ctx->ret_addr) & hash_ctl_2M; 107 hashed_bit ^= FIELD_GET(BIT_ULL(32), ctx->ret_addr) & hash_ctl_1G; 108 109 if (hashed_bit != intlv_bit) 110 ctx->ret_addr ^= BIT_ULL(intlv_bit_pos); 111 112 intlv_bit_pos++; 113 intlv_bit = !!(BIT_ULL(intlv_bit_pos) & ctx->ret_addr); 114 115 hashed_bit = intlv_bit; 116 hashed_bit ^= FIELD_GET(BIT_ULL(21), ctx->ret_addr) & hash_ctl_2M; 117 hashed_bit ^= FIELD_GET(BIT_ULL(30), ctx->ret_addr) & hash_ctl_1G; 118 119 if (hashed_bit != intlv_bit) 120 ctx->ret_addr ^= BIT_ULL(intlv_bit_pos); 121 122 intlv_bit_pos++; 123 intlv_bit = !!(BIT_ULL(intlv_bit_pos) & ctx->ret_addr); 124 125 hashed_bit = intlv_bit; 126 hashed_bit ^= FIELD_GET(BIT_ULL(22), ctx->ret_addr) & hash_ctl_2M; 127 hashed_bit ^= FIELD_GET(BIT_ULL(31), ctx->ret_addr) & hash_ctl_1G; 128 129 if (hashed_bit != intlv_bit) 130 ctx->ret_addr ^= BIT_ULL(intlv_bit_pos); 131 132 return 0; 133} 134 135static int df4_dehash_addr(struct addr_ctx *ctx) 136{ 137 bool hash_ctl_64k, hash_ctl_2M, hash_ctl_1G; 138 u8 hashed_bit, intlv_bit; 139 140 hash_ctl_64k = FIELD_GET(DF4_HASH_CTL_64K, ctx->map.ctl); 141 hash_ctl_2M = FIELD_GET(DF4_HASH_CTL_2M, ctx->map.ctl); 142 hash_ctl_1G = FIELD_GET(DF4_HASH_CTL_1G, ctx->map.ctl); 143 144 intlv_bit = FIELD_GET(BIT_ULL(8), ctx->ret_addr); 145 146 hashed_bit = intlv_bit; 147 hashed_bit ^= FIELD_GET(BIT_ULL(16), ctx->ret_addr) & hash_ctl_64k; 148 hashed_bit ^= FIELD_GET(BIT_ULL(21), ctx->ret_addr) & hash_ctl_2M; 149 hashed_bit ^= FIELD_GET(BIT_ULL(30), ctx->ret_addr) & hash_ctl_1G; 150 151 if (ctx->map.num_intlv_sockets == 1) 152 hashed_bit ^= FIELD_GET(BIT_ULL(14), ctx->ret_addr); 153 154 if (hashed_bit != intlv_bit) 155 ctx->ret_addr ^= BIT_ULL(8); 156 157 /* 158 * Hashing is possible with socket interleaving, so check the total number 159 * of channels in the system rather than DRAM map interleaving mode. 160 * 161 * Calculation complete for 2 channels. Continue for 4, 8, and 16 channels. 162 */ 163 if (ctx->map.total_intlv_chan <= 2) 164 return 0; 165 166 intlv_bit = FIELD_GET(BIT_ULL(12), ctx->ret_addr); 167 168 hashed_bit = intlv_bit; 169 hashed_bit ^= FIELD_GET(BIT_ULL(17), ctx->ret_addr) & hash_ctl_64k; 170 hashed_bit ^= FIELD_GET(BIT_ULL(22), ctx->ret_addr) & hash_ctl_2M; 171 hashed_bit ^= FIELD_GET(BIT_ULL(31), ctx->ret_addr) & hash_ctl_1G; 172 173 if (hashed_bit != intlv_bit) 174 ctx->ret_addr ^= BIT_ULL(12); 175 176 /* Calculation complete for 4 channels. Continue for 8 and 16 channels. */ 177 if (ctx->map.total_intlv_chan <= 4) 178 return 0; 179 180 intlv_bit = FIELD_GET(BIT_ULL(13), ctx->ret_addr); 181 182 hashed_bit = intlv_bit; 183 hashed_bit ^= FIELD_GET(BIT_ULL(18), ctx->ret_addr) & hash_ctl_64k; 184 hashed_bit ^= FIELD_GET(BIT_ULL(23), ctx->ret_addr) & hash_ctl_2M; 185 hashed_bit ^= FIELD_GET(BIT_ULL(32), ctx->ret_addr) & hash_ctl_1G; 186 187 if (hashed_bit != intlv_bit) 188 ctx->ret_addr ^= BIT_ULL(13); 189 190 /* Calculation complete for 8 channels. Continue for 16 channels. */ 191 if (ctx->map.total_intlv_chan <= 8) 192 return 0; 193 194 intlv_bit = FIELD_GET(BIT_ULL(14), ctx->ret_addr); 195 196 hashed_bit = intlv_bit; 197 hashed_bit ^= FIELD_GET(BIT_ULL(19), ctx->ret_addr) & hash_ctl_64k; 198 hashed_bit ^= FIELD_GET(BIT_ULL(24), ctx->ret_addr) & hash_ctl_2M; 199 hashed_bit ^= FIELD_GET(BIT_ULL(33), ctx->ret_addr) & hash_ctl_1G; 200 201 if (hashed_bit != intlv_bit) 202 ctx->ret_addr ^= BIT_ULL(14); 203 204 return 0; 205} 206 207static int df4p5_dehash_addr(struct addr_ctx *ctx) 208{ 209 bool hash_ctl_64k, hash_ctl_2M, hash_ctl_1G, hash_ctl_1T; 210 u8 hashed_bit, intlv_bit; 211 u64 rehash_vector; 212 213 hash_ctl_64k = FIELD_GET(DF4_HASH_CTL_64K, ctx->map.ctl); 214 hash_ctl_2M = FIELD_GET(DF4_HASH_CTL_2M, ctx->map.ctl); 215 hash_ctl_1G = FIELD_GET(DF4_HASH_CTL_1G, ctx->map.ctl); 216 hash_ctl_1T = FIELD_GET(DF4p5_HASH_CTL_1T, ctx->map.ctl); 217 218 /* 219 * Generate a unique address to determine which bits 220 * need to be dehashed. 221 * 222 * Start with a contiguous bitmask for the total 223 * number of channels starting at bit 8. 224 * 225 * Then make a gap in the proper place based on 226 * interleave mode. 227 */ 228 rehash_vector = ctx->map.total_intlv_chan - 1; 229 rehash_vector <<= 8; 230 231 if (ctx->map.intlv_mode == DF4p5_NPS2_4CHAN_1K_HASH || 232 ctx->map.intlv_mode == DF4p5_NPS1_8CHAN_1K_HASH || 233 ctx->map.intlv_mode == DF4p5_NPS1_16CHAN_1K_HASH) 234 rehash_vector = expand_bits(10, 2, rehash_vector); 235 else 236 rehash_vector = expand_bits(9, 3, rehash_vector); 237 238 if (rehash_vector & BIT_ULL(8)) { 239 intlv_bit = FIELD_GET(BIT_ULL(8), ctx->ret_addr); 240 241 hashed_bit = intlv_bit; 242 hashed_bit ^= FIELD_GET(BIT_ULL(16), ctx->ret_addr) & hash_ctl_64k; 243 hashed_bit ^= FIELD_GET(BIT_ULL(21), ctx->ret_addr) & hash_ctl_2M; 244 hashed_bit ^= FIELD_GET(BIT_ULL(30), ctx->ret_addr) & hash_ctl_1G; 245 hashed_bit ^= FIELD_GET(BIT_ULL(40), ctx->ret_addr) & hash_ctl_1T; 246 247 if (hashed_bit != intlv_bit) 248 ctx->ret_addr ^= BIT_ULL(8); 249 } 250 251 if (rehash_vector & BIT_ULL(9)) { 252 intlv_bit = FIELD_GET(BIT_ULL(9), ctx->ret_addr); 253 254 hashed_bit = intlv_bit; 255 hashed_bit ^= FIELD_GET(BIT_ULL(17), ctx->ret_addr) & hash_ctl_64k; 256 hashed_bit ^= FIELD_GET(BIT_ULL(22), ctx->ret_addr) & hash_ctl_2M; 257 hashed_bit ^= FIELD_GET(BIT_ULL(31), ctx->ret_addr) & hash_ctl_1G; 258 hashed_bit ^= FIELD_GET(BIT_ULL(41), ctx->ret_addr) & hash_ctl_1T; 259 260 if (hashed_bit != intlv_bit) 261 ctx->ret_addr ^= BIT_ULL(9); 262 } 263 264 if (rehash_vector & BIT_ULL(12)) { 265 intlv_bit = FIELD_GET(BIT_ULL(12), ctx->ret_addr); 266 267 hashed_bit = intlv_bit; 268 hashed_bit ^= FIELD_GET(BIT_ULL(18), ctx->ret_addr) & hash_ctl_64k; 269 hashed_bit ^= FIELD_GET(BIT_ULL(23), ctx->ret_addr) & hash_ctl_2M; 270 hashed_bit ^= FIELD_GET(BIT_ULL(32), ctx->ret_addr) & hash_ctl_1G; 271 hashed_bit ^= FIELD_GET(BIT_ULL(42), ctx->ret_addr) & hash_ctl_1T; 272 273 if (hashed_bit != intlv_bit) 274 ctx->ret_addr ^= BIT_ULL(12); 275 } 276 277 if (rehash_vector & BIT_ULL(13)) { 278 intlv_bit = FIELD_GET(BIT_ULL(13), ctx->ret_addr); 279 280 hashed_bit = intlv_bit; 281 hashed_bit ^= FIELD_GET(BIT_ULL(19), ctx->ret_addr) & hash_ctl_64k; 282 hashed_bit ^= FIELD_GET(BIT_ULL(24), ctx->ret_addr) & hash_ctl_2M; 283 hashed_bit ^= FIELD_GET(BIT_ULL(33), ctx->ret_addr) & hash_ctl_1G; 284 hashed_bit ^= FIELD_GET(BIT_ULL(43), ctx->ret_addr) & hash_ctl_1T; 285 286 if (hashed_bit != intlv_bit) 287 ctx->ret_addr ^= BIT_ULL(13); 288 } 289 290 if (rehash_vector & BIT_ULL(14)) { 291 intlv_bit = FIELD_GET(BIT_ULL(14), ctx->ret_addr); 292 293 hashed_bit = intlv_bit; 294 hashed_bit ^= FIELD_GET(BIT_ULL(20), ctx->ret_addr) & hash_ctl_64k; 295 hashed_bit ^= FIELD_GET(BIT_ULL(25), ctx->ret_addr) & hash_ctl_2M; 296 hashed_bit ^= FIELD_GET(BIT_ULL(34), ctx->ret_addr) & hash_ctl_1G; 297 hashed_bit ^= FIELD_GET(BIT_ULL(44), ctx->ret_addr) & hash_ctl_1T; 298 299 if (hashed_bit != intlv_bit) 300 ctx->ret_addr ^= BIT_ULL(14); 301 } 302 303 return 0; 304} 305 306/* 307 * MI300 hash bits 308 * 4K 64K 2M 1G 1T 1T 309 * COH_ST_Select[0] = XOR of addr{8, 12, 15, 22, 29, 36, 43} 310 * COH_ST_Select[1] = XOR of addr{9, 13, 16, 23, 30, 37, 44} 311 * COH_ST_Select[2] = XOR of addr{10, 14, 17, 24, 31, 38, 45} 312 * COH_ST_Select[3] = XOR of addr{11, 18, 25, 32, 39, 46} 313 * COH_ST_Select[4] = XOR of addr{14, 19, 26, 33, 40, 47} aka Stack 314 * DieID[0] = XOR of addr{12, 20, 27, 34, 41 } 315 * DieID[1] = XOR of addr{13, 21, 28, 35, 42 } 316 */ 317static int mi300_dehash_addr(struct addr_ctx *ctx) 318{ 319 bool hash_ctl_4k, hash_ctl_64k, hash_ctl_2M, hash_ctl_1G, hash_ctl_1T; 320 bool hashed_bit, intlv_bit, test_bit; 321 u8 num_intlv_bits, base_bit, i; 322 323 hash_ctl_4k = FIELD_GET(DF4p5_HASH_CTL_4K, ctx->map.ctl); 324 hash_ctl_64k = FIELD_GET(DF4_HASH_CTL_64K, ctx->map.ctl); 325 hash_ctl_2M = FIELD_GET(DF4_HASH_CTL_2M, ctx->map.ctl); 326 hash_ctl_1G = FIELD_GET(DF4_HASH_CTL_1G, ctx->map.ctl); 327 hash_ctl_1T = FIELD_GET(DF4p5_HASH_CTL_1T, ctx->map.ctl); 328 329 /* Channel bits */ 330 num_intlv_bits = ilog2(ctx->map.num_intlv_chan); 331 332 for (i = 0; i < num_intlv_bits; i++) { 333 base_bit = 8 + i; 334 335 /* COH_ST_Select[4] jumps to a base bit of 14. */ 336 if (i == 4) 337 base_bit = 14; 338 339 intlv_bit = BIT_ULL(base_bit) & ctx->ret_addr; 340 341 hashed_bit = intlv_bit; 342 343 /* 4k hash bit only applies to the first 3 bits. */ 344 if (i <= 2) { 345 test_bit = BIT_ULL(12 + i) & ctx->ret_addr; 346 hashed_bit ^= test_bit & hash_ctl_4k; 347 } 348 349 /* Use temporary 'test_bit' value to avoid Sparse warnings. */ 350 test_bit = BIT_ULL(15 + i) & ctx->ret_addr; 351 hashed_bit ^= test_bit & hash_ctl_64k; 352 test_bit = BIT_ULL(22 + i) & ctx->ret_addr; 353 hashed_bit ^= test_bit & hash_ctl_2M; 354 test_bit = BIT_ULL(29 + i) & ctx->ret_addr; 355 hashed_bit ^= test_bit & hash_ctl_1G; 356 test_bit = BIT_ULL(36 + i) & ctx->ret_addr; 357 hashed_bit ^= test_bit & hash_ctl_1T; 358 test_bit = BIT_ULL(43 + i) & ctx->ret_addr; 359 hashed_bit ^= test_bit & hash_ctl_1T; 360 361 if (hashed_bit != intlv_bit) 362 ctx->ret_addr ^= BIT_ULL(base_bit); 363 } 364 365 /* Die bits */ 366 num_intlv_bits = ilog2(ctx->map.num_intlv_dies); 367 368 for (i = 0; i < num_intlv_bits; i++) { 369 base_bit = 12 + i; 370 371 intlv_bit = BIT_ULL(base_bit) & ctx->ret_addr; 372 373 hashed_bit = intlv_bit; 374 375 test_bit = BIT_ULL(20 + i) & ctx->ret_addr; 376 hashed_bit ^= test_bit & hash_ctl_64k; 377 test_bit = BIT_ULL(27 + i) & ctx->ret_addr; 378 hashed_bit ^= test_bit & hash_ctl_2M; 379 test_bit = BIT_ULL(34 + i) & ctx->ret_addr; 380 hashed_bit ^= test_bit & hash_ctl_1G; 381 test_bit = BIT_ULL(41 + i) & ctx->ret_addr; 382 hashed_bit ^= test_bit & hash_ctl_1T; 383 384 if (hashed_bit != intlv_bit) 385 ctx->ret_addr ^= BIT_ULL(base_bit); 386 } 387 388 return 0; 389} 390 391int dehash_address(struct addr_ctx *ctx) 392{ 393 switch (ctx->map.intlv_mode) { 394 /* No hashing cases. */ 395 case NONE: 396 case NOHASH_2CHAN: 397 case NOHASH_4CHAN: 398 case NOHASH_8CHAN: 399 case NOHASH_16CHAN: 400 case NOHASH_32CHAN: 401 /* Hashing bits handled earlier during CS ID calculation. */ 402 case DF4_NPS4_3CHAN_HASH: 403 case DF4_NPS2_5CHAN_HASH: 404 case DF4_NPS2_6CHAN_HASH: 405 case DF4_NPS1_10CHAN_HASH: 406 case DF4_NPS1_12CHAN_HASH: 407 case DF4p5_NPS2_6CHAN_1K_HASH: 408 case DF4p5_NPS2_6CHAN_2K_HASH: 409 case DF4p5_NPS1_10CHAN_1K_HASH: 410 case DF4p5_NPS1_10CHAN_2K_HASH: 411 case DF4p5_NPS1_12CHAN_1K_HASH: 412 case DF4p5_NPS1_12CHAN_2K_HASH: 413 case DF4p5_NPS0_24CHAN_1K_HASH: 414 case DF4p5_NPS0_24CHAN_2K_HASH: 415 /* No hash physical address bits, so nothing to do. */ 416 case DF4p5_NPS4_3CHAN_1K_HASH: 417 case DF4p5_NPS4_3CHAN_2K_HASH: 418 case DF4p5_NPS2_5CHAN_1K_HASH: 419 case DF4p5_NPS2_5CHAN_2K_HASH: 420 return 0; 421 422 case DF2_2CHAN_HASH: 423 return df2_dehash_addr(ctx); 424 425 case DF3_COD4_2CHAN_HASH: 426 case DF3_COD2_4CHAN_HASH: 427 case DF3_COD1_8CHAN_HASH: 428 return df3_dehash_addr(ctx); 429 430 case DF3_6CHAN: 431 return df3_6chan_dehash_addr(ctx); 432 433 case DF4_NPS4_2CHAN_HASH: 434 case DF4_NPS2_4CHAN_HASH: 435 case DF4_NPS1_8CHAN_HASH: 436 return df4_dehash_addr(ctx); 437 438 case DF4p5_NPS4_2CHAN_1K_HASH: 439 case DF4p5_NPS4_2CHAN_2K_HASH: 440 case DF4p5_NPS2_4CHAN_2K_HASH: 441 case DF4p5_NPS2_4CHAN_1K_HASH: 442 case DF4p5_NPS1_8CHAN_1K_HASH: 443 case DF4p5_NPS1_8CHAN_2K_HASH: 444 case DF4p5_NPS1_16CHAN_1K_HASH: 445 case DF4p5_NPS1_16CHAN_2K_HASH: 446 return df4p5_dehash_addr(ctx); 447 448 case MI3_HASH_8CHAN: 449 case MI3_HASH_16CHAN: 450 case MI3_HASH_32CHAN: 451 return mi300_dehash_addr(ctx); 452 453 default: 454 atl_debug_on_bad_intlv_mode(ctx); 455 return -EINVAL; 456 } 457}
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