FILE
page.c
File preview with syntax highlighting.
linux-6.19.14/arch/mips/mm/page.c
1/* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 2003, 04, 05 Ralf Baechle (ralf@linux-mips.org) 7 * Copyright (C) 2007 Maciej W. Rozycki 8 * Copyright (C) 2008 Thiemo Seufer 9 * Copyright (C) 2012 MIPS Technologies, Inc. 10 */ 11#include <linux/kernel.h> 12#include <linux/sched.h> 13#include <linux/smp.h> 14#include <linux/mm.h> 15#include <linux/proc_fs.h> 16 17#include <asm/bugs.h> 18#include <asm/cacheops.h> 19#include <asm/cpu-type.h> 20#include <asm/inst.h> 21#include <asm/io.h> 22#include <asm/page.h> 23#include <asm/prefetch.h> 24#include <asm/bootinfo.h> 25#include <asm/mipsregs.h> 26#include <asm/mmu_context.h> 27#include <asm/regdef.h> 28#include <asm/cpu.h> 29 30#ifdef CONFIG_SIBYTE_DMA_PAGEOPS 31#include <asm/sibyte/sb1250.h> 32#include <asm/sibyte/sb1250_regs.h> 33#include <asm/sibyte/sb1250_dma.h> 34#endif 35 36#include <asm/uasm.h> 37 38/* Handle labels (which must be positive integers). */ 39enum label_id { 40 label_clear_nopref = 1, 41 label_clear_pref, 42 label_copy_nopref, 43 label_copy_pref_both, 44 label_copy_pref_store, 45}; 46 47UASM_L_LA(_clear_nopref) 48UASM_L_LA(_clear_pref) 49UASM_L_LA(_copy_nopref) 50UASM_L_LA(_copy_pref_both) 51UASM_L_LA(_copy_pref_store) 52 53/* We need one branch and therefore one relocation per target label. */ 54static struct uasm_label labels[5]; 55static struct uasm_reloc relocs[5]; 56 57#define cpu_is_r4600_v1_x() ((read_c0_prid() & 0xfffffff0) == 0x00002010) 58#define cpu_is_r4600_v2_x() ((read_c0_prid() & 0xfffffff0) == 0x00002020) 59 60/* 61 * R6 has a limited offset of the pref instruction. 62 * Skip it if the offset is more than 9 bits. 63 */ 64#define _uasm_i_pref(a, b, c, d) \ 65do { \ 66 if (cpu_has_mips_r6) { \ 67 if (c <= 0xff && c >= -0x100) \ 68 uasm_i_pref(a, b, c, d);\ 69 } else { \ 70 uasm_i_pref(a, b, c, d); \ 71 } \ 72} while(0) 73 74static int pref_bias_clear_store; 75static int pref_bias_copy_load; 76static int pref_bias_copy_store; 77 78static u32 pref_src_mode; 79static u32 pref_dst_mode; 80 81static int clear_word_size; 82static int copy_word_size; 83 84static int half_clear_loop_size; 85static int half_copy_loop_size; 86 87static int cache_line_size; 88#define cache_line_mask() (cache_line_size - 1) 89 90static inline void 91pg_addiu(u32 **buf, unsigned int reg1, unsigned int reg2, unsigned int off) 92{ 93 if (cpu_has_64bit_gp_regs && 94 IS_ENABLED(CONFIG_CPU_DADDI_WORKAROUNDS) && 95 r4k_daddiu_bug()) { 96 if (off > 0x7fff) { 97 uasm_i_lui(buf, GPR_T9, uasm_rel_hi(off)); 98 uasm_i_addiu(buf, GPR_T9, GPR_T9, uasm_rel_lo(off)); 99 } else 100 uasm_i_addiu(buf, GPR_T9, GPR_ZERO, off); 101 uasm_i_daddu(buf, reg1, reg2, GPR_T9); 102 } else { 103 if (off > 0x7fff) { 104 uasm_i_lui(buf, GPR_T9, uasm_rel_hi(off)); 105 uasm_i_addiu(buf, GPR_T9, GPR_T9, uasm_rel_lo(off)); 106 UASM_i_ADDU(buf, reg1, reg2, GPR_T9); 107 } else 108 UASM_i_ADDIU(buf, reg1, reg2, off); 109 } 110} 111 112static void set_prefetch_parameters(void) 113{ 114 if (cpu_has_64bit_gp_regs || cpu_has_64bit_zero_reg) 115 clear_word_size = 8; 116 else 117 clear_word_size = 4; 118 119 if (cpu_has_64bit_gp_regs) 120 copy_word_size = 8; 121 else 122 copy_word_size = 4; 123 124 /* 125 * The pref's used here are using "streaming" hints, which cause the 126 * copied data to be kicked out of the cache sooner. A page copy often 127 * ends up copying a lot more data than is commonly used, so this seems 128 * to make sense in terms of reducing cache pollution, but I've no real 129 * performance data to back this up. 130 */ 131 if (cpu_has_prefetch) { 132 /* 133 * XXX: Most prefetch bias values in here are based on 134 * guesswork. 135 */ 136 cache_line_size = cpu_dcache_line_size(); 137 switch (current_cpu_type()) { 138 case CPU_R5500: 139 case CPU_TX49XX: 140 /* These processors only support the Pref_Load. */ 141 pref_bias_copy_load = 256; 142 break; 143 144 case CPU_R10000: 145 case CPU_R12000: 146 case CPU_R14000: 147 case CPU_R16000: 148 /* 149 * Those values have been experimentally tuned for an 150 * Origin 200. 151 */ 152 pref_bias_clear_store = 512; 153 pref_bias_copy_load = 256; 154 pref_bias_copy_store = 256; 155 pref_src_mode = Pref_LoadStreamed; 156 pref_dst_mode = Pref_StoreStreamed; 157 break; 158 159 case CPU_SB1: 160 case CPU_SB1A: 161 pref_bias_clear_store = 128; 162 pref_bias_copy_load = 128; 163 pref_bias_copy_store = 128; 164 /* 165 * SB1 pass1 Pref_LoadStreamed/Pref_StoreStreamed 166 * hints are broken. 167 */ 168 if (current_cpu_type() == CPU_SB1 && 169 (current_cpu_data.processor_id & 0xff) < 0x02) { 170 pref_src_mode = Pref_Load; 171 pref_dst_mode = Pref_Store; 172 } else { 173 pref_src_mode = Pref_LoadStreamed; 174 pref_dst_mode = Pref_StoreStreamed; 175 } 176 break; 177 178 case CPU_LOONGSON64: 179 /* Loongson-3 only support the Pref_Load/Pref_Store. */ 180 pref_bias_clear_store = 128; 181 pref_bias_copy_load = 128; 182 pref_bias_copy_store = 128; 183 pref_src_mode = Pref_Load; 184 pref_dst_mode = Pref_Store; 185 break; 186 187 default: 188 pref_bias_clear_store = 128; 189 pref_bias_copy_load = 256; 190 pref_bias_copy_store = 128; 191 pref_src_mode = Pref_LoadStreamed; 192 if (cpu_has_mips_r6) 193 /* 194 * Bit 30 (Pref_PrepareForStore) has been 195 * removed from MIPS R6. Use bit 5 196 * (Pref_StoreStreamed). 197 */ 198 pref_dst_mode = Pref_StoreStreamed; 199 else 200 pref_dst_mode = Pref_PrepareForStore; 201 break; 202 } 203 } else { 204 if (cpu_has_cache_cdex_s) 205 cache_line_size = cpu_scache_line_size(); 206 else if (cpu_has_cache_cdex_p) 207 cache_line_size = cpu_dcache_line_size(); 208 } 209 /* 210 * Too much unrolling will overflow the available space in 211 * clear_space_array / copy_page_array. 212 */ 213 half_clear_loop_size = min(16 * clear_word_size, 214 max(cache_line_size >> 1, 215 4 * clear_word_size)); 216 half_copy_loop_size = min(16 * copy_word_size, 217 max(cache_line_size >> 1, 218 4 * copy_word_size)); 219} 220 221static void build_clear_store(u32 **buf, int off) 222{ 223 if (cpu_has_64bit_gp_regs || cpu_has_64bit_zero_reg) { 224 uasm_i_sd(buf, GPR_ZERO, off, GPR_A0); 225 } else { 226 uasm_i_sw(buf, GPR_ZERO, off, GPR_A0); 227 } 228} 229 230static inline void build_clear_pref(u32 **buf, int off) 231{ 232 if (off & cache_line_mask()) 233 return; 234 235 if (pref_bias_clear_store) { 236 _uasm_i_pref(buf, pref_dst_mode, pref_bias_clear_store + off, 237 GPR_A0); 238 } else if (cache_line_size == (half_clear_loop_size << 1)) { 239 if (cpu_has_cache_cdex_s) { 240 uasm_i_cache(buf, Create_Dirty_Excl_SD, off, GPR_A0); 241 } else if (cpu_has_cache_cdex_p) { 242 if (IS_ENABLED(CONFIG_WAR_R4600_V1_HIT_CACHEOP) && 243 cpu_is_r4600_v1_x()) { 244 uasm_i_nop(buf); 245 uasm_i_nop(buf); 246 uasm_i_nop(buf); 247 uasm_i_nop(buf); 248 } 249 250 if (IS_ENABLED(CONFIG_WAR_R4600_V2_HIT_CACHEOP) && 251 cpu_is_r4600_v2_x()) 252 uasm_i_lw(buf, GPR_ZERO, GPR_ZERO, GPR_AT); 253 254 uasm_i_cache(buf, Create_Dirty_Excl_D, off, GPR_A0); 255 } 256 } 257} 258 259extern u32 __clear_page_start; 260extern u32 __clear_page_end; 261extern u32 __copy_page_start; 262extern u32 __copy_page_end; 263 264void build_clear_page(void) 265{ 266 int off; 267 u32 *buf = &__clear_page_start; 268 struct uasm_label *l = labels; 269 struct uasm_reloc *r = relocs; 270 int i; 271 static atomic_t run_once = ATOMIC_INIT(0); 272 273 if (atomic_xchg(&run_once, 1)) { 274 return; 275 } 276 277 memset(labels, 0, sizeof(labels)); 278 memset(relocs, 0, sizeof(relocs)); 279 280 set_prefetch_parameters(); 281 282 /* 283 * This algorithm makes the following assumptions: 284 * - The prefetch bias is a multiple of 2 words. 285 * - The prefetch bias is less than one page. 286 */ 287 BUG_ON(pref_bias_clear_store % (2 * clear_word_size)); 288 BUG_ON(PAGE_SIZE < pref_bias_clear_store); 289 290 off = PAGE_SIZE - pref_bias_clear_store; 291 if (off > 0xffff || !pref_bias_clear_store) 292 pg_addiu(&buf, GPR_A2, GPR_A0, off); 293 else 294 uasm_i_ori(&buf, GPR_A2, GPR_A0, off); 295 296 if (IS_ENABLED(CONFIG_WAR_R4600_V2_HIT_CACHEOP) && cpu_is_r4600_v2_x()) 297 uasm_i_lui(&buf, GPR_AT, uasm_rel_hi(0xa0000000)); 298 299 off = cache_line_size ? min(8, pref_bias_clear_store / cache_line_size) 300 * cache_line_size : 0; 301 while (off) { 302 build_clear_pref(&buf, -off); 303 off -= cache_line_size; 304 } 305 uasm_l_clear_pref(&l, buf); 306 do { 307 build_clear_pref(&buf, off); 308 build_clear_store(&buf, off); 309 off += clear_word_size; 310 } while (off < half_clear_loop_size); 311 pg_addiu(&buf, GPR_A0, GPR_A0, 2 * off); 312 off = -off; 313 do { 314 build_clear_pref(&buf, off); 315 if (off == -clear_word_size) 316 uasm_il_bne(&buf, &r, GPR_A0, GPR_A2, label_clear_pref); 317 build_clear_store(&buf, off); 318 off += clear_word_size; 319 } while (off < 0); 320 321 if (pref_bias_clear_store) { 322 pg_addiu(&buf, GPR_A2, GPR_A0, pref_bias_clear_store); 323 uasm_l_clear_nopref(&l, buf); 324 off = 0; 325 do { 326 build_clear_store(&buf, off); 327 off += clear_word_size; 328 } while (off < half_clear_loop_size); 329 pg_addiu(&buf, GPR_A0, GPR_A0, 2 * off); 330 off = -off; 331 do { 332 if (off == -clear_word_size) 333 uasm_il_bne(&buf, &r, GPR_A0, GPR_A2, 334 label_clear_nopref); 335 build_clear_store(&buf, off); 336 off += clear_word_size; 337 } while (off < 0); 338 } 339 340 uasm_i_jr(&buf, GPR_RA); 341 uasm_i_nop(&buf); 342 343 BUG_ON(buf > &__clear_page_end); 344 345 uasm_resolve_relocs(relocs, labels); 346 347 pr_debug("Synthesized clear page handler (%u instructions).\n", 348 (u32)(buf - &__clear_page_start)); 349 350 pr_debug("\t.set push\n"); 351 pr_debug("\t.set noreorder\n"); 352 for (i = 0; i < (buf - &__clear_page_start); i++) 353 pr_debug("\t.word 0x%08x\n", (&__clear_page_start)[i]); 354 pr_debug("\t.set pop\n"); 355} 356 357static void build_copy_load(u32 **buf, int reg, int off) 358{ 359 if (cpu_has_64bit_gp_regs) { 360 uasm_i_ld(buf, reg, off, GPR_A1); 361 } else { 362 uasm_i_lw(buf, reg, off, GPR_A1); 363 } 364} 365 366static void build_copy_store(u32 **buf, int reg, int off) 367{ 368 if (cpu_has_64bit_gp_regs) { 369 uasm_i_sd(buf, reg, off, GPR_A0); 370 } else { 371 uasm_i_sw(buf, reg, off, GPR_A0); 372 } 373} 374 375static inline void build_copy_load_pref(u32 **buf, int off) 376{ 377 if (off & cache_line_mask()) 378 return; 379 380 if (pref_bias_copy_load) 381 _uasm_i_pref(buf, pref_src_mode, pref_bias_copy_load + off, GPR_A1); 382} 383 384static inline void build_copy_store_pref(u32 **buf, int off) 385{ 386 if (off & cache_line_mask()) 387 return; 388 389 if (pref_bias_copy_store) { 390 _uasm_i_pref(buf, pref_dst_mode, pref_bias_copy_store + off, 391 GPR_A0); 392 } else if (cache_line_size == (half_copy_loop_size << 1)) { 393 if (cpu_has_cache_cdex_s) { 394 uasm_i_cache(buf, Create_Dirty_Excl_SD, off, GPR_A0); 395 } else if (cpu_has_cache_cdex_p) { 396 if (IS_ENABLED(CONFIG_WAR_R4600_V1_HIT_CACHEOP) && 397 cpu_is_r4600_v1_x()) { 398 uasm_i_nop(buf); 399 uasm_i_nop(buf); 400 uasm_i_nop(buf); 401 uasm_i_nop(buf); 402 } 403 404 if (IS_ENABLED(CONFIG_WAR_R4600_V2_HIT_CACHEOP) && 405 cpu_is_r4600_v2_x()) 406 uasm_i_lw(buf, GPR_ZERO, GPR_ZERO, GPR_AT); 407 408 uasm_i_cache(buf, Create_Dirty_Excl_D, off, GPR_A0); 409 } 410 } 411} 412 413void build_copy_page(void) 414{ 415 int off; 416 u32 *buf = &__copy_page_start; 417 struct uasm_label *l = labels; 418 struct uasm_reloc *r = relocs; 419 int i; 420 static atomic_t run_once = ATOMIC_INIT(0); 421 422 if (atomic_xchg(&run_once, 1)) { 423 return; 424 } 425 426 memset(labels, 0, sizeof(labels)); 427 memset(relocs, 0, sizeof(relocs)); 428 429 set_prefetch_parameters(); 430 431 /* 432 * This algorithm makes the following assumptions: 433 * - All prefetch biases are multiples of 8 words. 434 * - The prefetch biases are less than one page. 435 * - The store prefetch bias isn't greater than the load 436 * prefetch bias. 437 */ 438 BUG_ON(pref_bias_copy_load % (8 * copy_word_size)); 439 BUG_ON(pref_bias_copy_store % (8 * copy_word_size)); 440 BUG_ON(PAGE_SIZE < pref_bias_copy_load); 441 BUG_ON(pref_bias_copy_store > pref_bias_copy_load); 442 443 off = PAGE_SIZE - pref_bias_copy_load; 444 if (off > 0xffff || !pref_bias_copy_load) 445 pg_addiu(&buf, GPR_A2, GPR_A0, off); 446 else 447 uasm_i_ori(&buf, GPR_A2, GPR_A0, off); 448 449 if (IS_ENABLED(CONFIG_WAR_R4600_V2_HIT_CACHEOP) && cpu_is_r4600_v2_x()) 450 uasm_i_lui(&buf, GPR_AT, uasm_rel_hi(0xa0000000)); 451 452 off = cache_line_size ? min(8, pref_bias_copy_load / cache_line_size) * 453 cache_line_size : 0; 454 while (off) { 455 build_copy_load_pref(&buf, -off); 456 off -= cache_line_size; 457 } 458 off = cache_line_size ? min(8, pref_bias_copy_store / cache_line_size) * 459 cache_line_size : 0; 460 while (off) { 461 build_copy_store_pref(&buf, -off); 462 off -= cache_line_size; 463 } 464 uasm_l_copy_pref_both(&l, buf); 465 do { 466 build_copy_load_pref(&buf, off); 467 build_copy_load(&buf, GPR_T0, off); 468 build_copy_load_pref(&buf, off + copy_word_size); 469 build_copy_load(&buf, GPR_T1, off + copy_word_size); 470 build_copy_load_pref(&buf, off + 2 * copy_word_size); 471 build_copy_load(&buf, GPR_T2, off + 2 * copy_word_size); 472 build_copy_load_pref(&buf, off + 3 * copy_word_size); 473 build_copy_load(&buf, GPR_T3, off + 3 * copy_word_size); 474 build_copy_store_pref(&buf, off); 475 build_copy_store(&buf, GPR_T0, off); 476 build_copy_store_pref(&buf, off + copy_word_size); 477 build_copy_store(&buf, GPR_T1, off + copy_word_size); 478 build_copy_store_pref(&buf, off + 2 * copy_word_size); 479 build_copy_store(&buf, GPR_T2, off + 2 * copy_word_size); 480 build_copy_store_pref(&buf, off + 3 * copy_word_size); 481 build_copy_store(&buf, GPR_T3, off + 3 * copy_word_size); 482 off += 4 * copy_word_size; 483 } while (off < half_copy_loop_size); 484 pg_addiu(&buf, GPR_A1, GPR_A1, 2 * off); 485 pg_addiu(&buf, GPR_A0, GPR_A0, 2 * off); 486 off = -off; 487 do { 488 build_copy_load_pref(&buf, off); 489 build_copy_load(&buf, GPR_T0, off); 490 build_copy_load_pref(&buf, off + copy_word_size); 491 build_copy_load(&buf, GPR_T1, off + copy_word_size); 492 build_copy_load_pref(&buf, off + 2 * copy_word_size); 493 build_copy_load(&buf, GPR_T2, off + 2 * copy_word_size); 494 build_copy_load_pref(&buf, off + 3 * copy_word_size); 495 build_copy_load(&buf, GPR_T3, off + 3 * copy_word_size); 496 build_copy_store_pref(&buf, off); 497 build_copy_store(&buf, GPR_T0, off); 498 build_copy_store_pref(&buf, off + copy_word_size); 499 build_copy_store(&buf, GPR_T1, off + copy_word_size); 500 build_copy_store_pref(&buf, off + 2 * copy_word_size); 501 build_copy_store(&buf, GPR_T2, off + 2 * copy_word_size); 502 build_copy_store_pref(&buf, off + 3 * copy_word_size); 503 if (off == -(4 * copy_word_size)) 504 uasm_il_bne(&buf, &r, GPR_A2, GPR_A0, label_copy_pref_both); 505 build_copy_store(&buf, GPR_T3, off + 3 * copy_word_size); 506 off += 4 * copy_word_size; 507 } while (off < 0); 508 509 if (pref_bias_copy_load - pref_bias_copy_store) { 510 pg_addiu(&buf, GPR_A2, GPR_A0, 511 pref_bias_copy_load - pref_bias_copy_store); 512 uasm_l_copy_pref_store(&l, buf); 513 off = 0; 514 do { 515 build_copy_load(&buf, GPR_T0, off); 516 build_copy_load(&buf, GPR_T1, off + copy_word_size); 517 build_copy_load(&buf, GPR_T2, off + 2 * copy_word_size); 518 build_copy_load(&buf, GPR_T3, off + 3 * copy_word_size); 519 build_copy_store_pref(&buf, off); 520 build_copy_store(&buf, GPR_T0, off); 521 build_copy_store_pref(&buf, off + copy_word_size); 522 build_copy_store(&buf, GPR_T1, off + copy_word_size); 523 build_copy_store_pref(&buf, off + 2 * copy_word_size); 524 build_copy_store(&buf, GPR_T2, off + 2 * copy_word_size); 525 build_copy_store_pref(&buf, off + 3 * copy_word_size); 526 build_copy_store(&buf, GPR_T3, off + 3 * copy_word_size); 527 off += 4 * copy_word_size; 528 } while (off < half_copy_loop_size); 529 pg_addiu(&buf, GPR_A1, GPR_A1, 2 * off); 530 pg_addiu(&buf, GPR_A0, GPR_A0, 2 * off); 531 off = -off; 532 do { 533 build_copy_load(&buf, GPR_T0, off); 534 build_copy_load(&buf, GPR_T1, off + copy_word_size); 535 build_copy_load(&buf, GPR_T2, off + 2 * copy_word_size); 536 build_copy_load(&buf, GPR_T3, off + 3 * copy_word_size); 537 build_copy_store_pref(&buf, off); 538 build_copy_store(&buf, GPR_T0, off); 539 build_copy_store_pref(&buf, off + copy_word_size); 540 build_copy_store(&buf, GPR_T1, off + copy_word_size); 541 build_copy_store_pref(&buf, off + 2 * copy_word_size); 542 build_copy_store(&buf, GPR_T2, off + 2 * copy_word_size); 543 build_copy_store_pref(&buf, off + 3 * copy_word_size); 544 if (off == -(4 * copy_word_size)) 545 uasm_il_bne(&buf, &r, GPR_A2, GPR_A0, 546 label_copy_pref_store); 547 build_copy_store(&buf, GPR_T3, off + 3 * copy_word_size); 548 off += 4 * copy_word_size; 549 } while (off < 0); 550 } 551 552 if (pref_bias_copy_store) { 553 pg_addiu(&buf, GPR_A2, GPR_A0, pref_bias_copy_store); 554 uasm_l_copy_nopref(&l, buf); 555 off = 0; 556 do { 557 build_copy_load(&buf, GPR_T0, off); 558 build_copy_load(&buf, GPR_T1, off + copy_word_size); 559 build_copy_load(&buf, GPR_T2, off + 2 * copy_word_size); 560 build_copy_load(&buf, GPR_T3, off + 3 * copy_word_size); 561 build_copy_store(&buf, GPR_T0, off); 562 build_copy_store(&buf, GPR_T1, off + copy_word_size); 563 build_copy_store(&buf, GPR_T2, off + 2 * copy_word_size); 564 build_copy_store(&buf, GPR_T3, off + 3 * copy_word_size); 565 off += 4 * copy_word_size; 566 } while (off < half_copy_loop_size); 567 pg_addiu(&buf, GPR_A1, GPR_A1, 2 * off); 568 pg_addiu(&buf, GPR_A0, GPR_A0, 2 * off); 569 off = -off; 570 do { 571 build_copy_load(&buf, GPR_T0, off); 572 build_copy_load(&buf, GPR_T1, off + copy_word_size); 573 build_copy_load(&buf, GPR_T2, off + 2 * copy_word_size); 574 build_copy_load(&buf, GPR_T3, off + 3 * copy_word_size); 575 build_copy_store(&buf, GPR_T0, off); 576 build_copy_store(&buf, GPR_T1, off + copy_word_size); 577 build_copy_store(&buf, GPR_T2, off + 2 * copy_word_size); 578 if (off == -(4 * copy_word_size)) 579 uasm_il_bne(&buf, &r, GPR_A2, GPR_A0, 580 label_copy_nopref); 581 build_copy_store(&buf, GPR_T3, off + 3 * copy_word_size); 582 off += 4 * copy_word_size; 583 } while (off < 0); 584 } 585 586 uasm_i_jr(&buf, GPR_RA); 587 uasm_i_nop(&buf); 588 589 BUG_ON(buf > &__copy_page_end); 590 591 uasm_resolve_relocs(relocs, labels); 592 593 pr_debug("Synthesized copy page handler (%u instructions).\n", 594 (u32)(buf - &__copy_page_start)); 595 596 pr_debug("\t.set push\n"); 597 pr_debug("\t.set noreorder\n"); 598 for (i = 0; i < (buf - &__copy_page_start); i++) 599 pr_debug("\t.word 0x%08x\n", (&__copy_page_start)[i]); 600 pr_debug("\t.set pop\n"); 601} 602 603#ifdef CONFIG_SIBYTE_DMA_PAGEOPS 604extern void clear_page_cpu(void *page); 605extern void copy_page_cpu(void *to, void *from); 606 607/* 608 * Pad descriptors to cacheline, since each is exclusively owned by a 609 * particular CPU. 610 */ 611struct dmadscr { 612 u64 dscr_a; 613 u64 dscr_b; 614 u64 pad_a; 615 u64 pad_b; 616} ____cacheline_aligned_in_smp page_descr[DM_NUM_CHANNELS]; 617 618void clear_page(void *page) 619{ 620 u64 to_phys = CPHYSADDR((unsigned long)page); 621 unsigned int cpu = smp_processor_id(); 622 623 /* if the page is not in KSEG0, use old way */ 624 if ((long)KSEGX((unsigned long)page) != (long)CKSEG0) 625 return clear_page_cpu(page); 626 627 page_descr[cpu].dscr_a = to_phys | M_DM_DSCRA_ZERO_MEM | 628 M_DM_DSCRA_L2C_DEST | M_DM_DSCRA_INTERRUPT; 629 page_descr[cpu].dscr_b = V_DM_DSCRB_SRC_LENGTH(PAGE_SIZE); 630 __raw_writeq(1, IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_COUNT))); 631 632 /* 633 * Don't really want to do it this way, but there's no 634 * reliable way to delay completion detection. 635 */ 636 while (!(__raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE_DEBUG))) 637 & M_DM_DSCR_BASE_INTERRUPT)) 638 ; 639 __raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE))); 640} 641EXPORT_SYMBOL(clear_page); 642 643void copy_page(void *to, void *from) 644{ 645 u64 from_phys = CPHYSADDR((unsigned long)from); 646 u64 to_phys = CPHYSADDR((unsigned long)to); 647 unsigned int cpu = smp_processor_id(); 648 649 /* if any page is not in KSEG0, use old way */ 650 if ((long)KSEGX((unsigned long)to) != (long)CKSEG0 651 || (long)KSEGX((unsigned long)from) != (long)CKSEG0) 652 return copy_page_cpu(to, from); 653 654 page_descr[cpu].dscr_a = to_phys | M_DM_DSCRA_L2C_DEST | 655 M_DM_DSCRA_INTERRUPT; 656 page_descr[cpu].dscr_b = from_phys | V_DM_DSCRB_SRC_LENGTH(PAGE_SIZE); 657 __raw_writeq(1, IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_COUNT))); 658 659 /* 660 * Don't really want to do it this way, but there's no 661 * reliable way to delay completion detection. 662 */ 663 while (!(__raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE_DEBUG))) 664 & M_DM_DSCR_BASE_INTERRUPT)) 665 ; 666 __raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE))); 667} 668EXPORT_SYMBOL(copy_page); 669 670#endif /* CONFIG_SIBYTE_DMA_PAGEOPS */
~/
Read-only file preview.