1 /* 2 * pSeries_lpar.c 3 * Copyright (C) 2001 Todd Inglett, IBM Corporation 4 * 5 * pSeries LPAR support. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 22 #undef DEBUG_LOW 23 24 #include <linux/kernel.h> 25 #include <linux/dma-mapping.h> 26 #include <linux/console.h> 27 #include <asm/processor.h> 28 #include <asm/mmu.h> 29 #include <asm/page.h> 30 #include <asm/pgtable.h> 31 #include <asm/machdep.h> 32 #include <asm/abs_addr.h> 33 #include <asm/mmu_context.h> 34 #include <asm/iommu.h> 35 #include <asm/tlbflush.h> 36 #include <asm/tlb.h> 37 #include <asm/prom.h> 38 #include <asm/cputable.h> 39 #include <asm/udbg.h> 40 #include <asm/smp.h> 41 42 #include "plpar_wrappers.h" 43 44 #ifdef DEBUG_LOW 45 #define DBG_LOW(fmt...) do { udbg_printf(fmt); } while(0) 46 #else 47 #define DBG_LOW(fmt...) do { } while(0) 48 #endif 49 50 /* in hvCall.S */ 51 EXPORT_SYMBOL(plpar_hcall); 52 EXPORT_SYMBOL(plpar_hcall9); 53 EXPORT_SYMBOL(plpar_hcall_norets); 54 55 extern void pSeries_find_serial_port(void); 56 57 58 int vtermno; /* virtual terminal# for udbg */ 59 60 #define __ALIGNED__ __attribute__((__aligned__(sizeof(long)))) 61 static void udbg_hvsi_putc(char c) 62 { 63 /* packet's seqno isn't used anyways */ 64 uint8_t packet[] __ALIGNED__ = { 0xff, 5, 0, 0, c }; 65 int rc; 66 67 if (c == '\n') 68 udbg_hvsi_putc('\r'); 69 70 do { 71 rc = plpar_put_term_char(vtermno, sizeof(packet), packet); 72 } while (rc == H_BUSY); 73 } 74 75 static long hvsi_udbg_buf_len; 76 static uint8_t hvsi_udbg_buf[256]; 77 78 static int udbg_hvsi_getc_poll(void) 79 { 80 unsigned char ch; 81 int rc, i; 82 83 if (hvsi_udbg_buf_len == 0) { 84 rc = plpar_get_term_char(vtermno, &hvsi_udbg_buf_len, hvsi_udbg_buf); 85 if (rc != H_SUCCESS || hvsi_udbg_buf[0] != 0xff) { 86 /* bad read or non-data packet */ 87 hvsi_udbg_buf_len = 0; 88 } else { 89 /* remove the packet header */ 90 for (i = 4; i < hvsi_udbg_buf_len; i++) 91 hvsi_udbg_buf[i-4] = hvsi_udbg_buf[i]; 92 hvsi_udbg_buf_len -= 4; 93 } 94 } 95 96 if (hvsi_udbg_buf_len <= 0 || hvsi_udbg_buf_len > 256) { 97 /* no data ready */ 98 hvsi_udbg_buf_len = 0; 99 return -1; 100 } 101 102 ch = hvsi_udbg_buf[0]; 103 /* shift remaining data down */ 104 for (i = 1; i < hvsi_udbg_buf_len; i++) { 105 hvsi_udbg_buf[i-1] = hvsi_udbg_buf[i]; 106 } 107 hvsi_udbg_buf_len--; 108 109 return ch; 110 } 111 112 static int udbg_hvsi_getc(void) 113 { 114 int ch; 115 for (;;) { 116 ch = udbg_hvsi_getc_poll(); 117 if (ch == -1) { 118 /* This shouldn't be needed...but... */ 119 volatile unsigned long delay; 120 for (delay=0; delay < 2000000; delay++) 121 ; 122 } else { 123 return ch; 124 } 125 } 126 } 127 128 static void udbg_putcLP(char c) 129 { 130 char buf[16]; 131 unsigned long rc; 132 133 if (c == '\n') 134 udbg_putcLP('\r'); 135 136 buf[0] = c; 137 do { 138 rc = plpar_put_term_char(vtermno, 1, buf); 139 } while(rc == H_BUSY); 140 } 141 142 /* Buffered chars getc */ 143 static long inbuflen; 144 static long inbuf[2]; /* must be 2 longs */ 145 146 static int udbg_getc_pollLP(void) 147 { 148 /* The interface is tricky because it may return up to 16 chars. 149 * We save them statically for future calls to udbg_getc(). 150 */ 151 char ch, *buf = (char *)inbuf; 152 int i; 153 long rc; 154 if (inbuflen == 0) { 155 /* get some more chars. */ 156 inbuflen = 0; 157 rc = plpar_get_term_char(vtermno, &inbuflen, buf); 158 if (rc != H_SUCCESS) 159 inbuflen = 0; /* otherwise inbuflen is garbage */ 160 } 161 if (inbuflen <= 0 || inbuflen > 16) { 162 /* Catch error case as well as other oddities (corruption) */ 163 inbuflen = 0; 164 return -1; 165 } 166 ch = buf[0]; 167 for (i = 1; i < inbuflen; i++) /* shuffle them down. */ 168 buf[i-1] = buf[i]; 169 inbuflen--; 170 return ch; 171 } 172 173 static int udbg_getcLP(void) 174 { 175 int ch; 176 for (;;) { 177 ch = udbg_getc_pollLP(); 178 if (ch == -1) { 179 /* This shouldn't be needed...but... */ 180 volatile unsigned long delay; 181 for (delay=0; delay < 2000000; delay++) 182 ; 183 } else { 184 return ch; 185 } 186 } 187 } 188 189 /* call this from early_init() for a working debug console on 190 * vterm capable LPAR machines 191 */ 192 void __init udbg_init_debug_lpar(void) 193 { 194 vtermno = 0; 195 udbg_putc = udbg_putcLP; 196 udbg_getc = udbg_getcLP; 197 udbg_getc_poll = udbg_getc_pollLP; 198 } 199 200 /* returns 0 if couldn't find or use /chosen/stdout as console */ 201 void __init find_udbg_vterm(void) 202 { 203 struct device_node *stdout_node; 204 const u32 *termno; 205 const char *name; 206 int add_console; 207 208 /* find the boot console from /chosen/stdout */ 209 if (!of_chosen) 210 return; 211 name = of_get_property(of_chosen, "linux,stdout-path", NULL); 212 if (name == NULL) 213 return; 214 stdout_node = of_find_node_by_path(name); 215 if (!stdout_node) 216 return; 217 name = of_get_property(stdout_node, "name", NULL); 218 if (!name) { 219 printk(KERN_WARNING "stdout node missing 'name' property!\n"); 220 goto out; 221 } 222 /* The user has requested a console so this is already set up. */ 223 add_console = !strstr(cmd_line, "console="); 224 225 /* Check if it's a virtual terminal */ 226 if (strncmp(name, "vty", 3) != 0) 227 goto out; 228 termno = of_get_property(stdout_node, "reg", NULL); 229 if (termno == NULL) 230 goto out; 231 vtermno = termno[0]; 232 233 if (of_device_is_compatible(stdout_node, "hvterm1")) { 234 udbg_putc = udbg_putcLP; 235 udbg_getc = udbg_getcLP; 236 udbg_getc_poll = udbg_getc_pollLP; 237 if (add_console) 238 add_preferred_console("hvc", termno[0] & 0xff, NULL); 239 } else if (of_device_is_compatible(stdout_node, "hvterm-protocol")) { 240 vtermno = termno[0]; 241 udbg_putc = udbg_hvsi_putc; 242 udbg_getc = udbg_hvsi_getc; 243 udbg_getc_poll = udbg_hvsi_getc_poll; 244 if (add_console) 245 add_preferred_console("hvsi", termno[0] & 0xff, NULL); 246 } 247 out: 248 of_node_put(stdout_node); 249 } 250 251 void vpa_init(int cpu) 252 { 253 int hwcpu = get_hard_smp_processor_id(cpu); 254 unsigned long addr; 255 long ret; 256 257 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 258 lppaca[cpu].vmxregs_in_use = 1; 259 260 addr = __pa(&lppaca[cpu]); 261 ret = register_vpa(hwcpu, addr); 262 263 if (ret) { 264 printk(KERN_ERR "WARNING: vpa_init: VPA registration for " 265 "cpu %d (hw %d) of area %lx returns %ld\n", 266 cpu, hwcpu, addr, ret); 267 return; 268 } 269 /* 270 * PAPR says this feature is SLB-Buffer but firmware never 271 * reports that. All SPLPAR support SLB shadow buffer. 272 */ 273 addr = __pa(&slb_shadow[cpu]); 274 if (firmware_has_feature(FW_FEATURE_SPLPAR)) { 275 ret = register_slb_shadow(hwcpu, addr); 276 if (ret) 277 printk(KERN_ERR 278 "WARNING: vpa_init: SLB shadow buffer " 279 "registration for cpu %d (hw %d) of area %lx " 280 "returns %ld\n", cpu, hwcpu, addr, ret); 281 } 282 } 283 284 static long pSeries_lpar_hpte_insert(unsigned long hpte_group, 285 unsigned long va, unsigned long pa, 286 unsigned long rflags, unsigned long vflags, 287 int psize, int ssize) 288 { 289 unsigned long lpar_rc; 290 unsigned long flags; 291 unsigned long slot; 292 unsigned long hpte_v, hpte_r; 293 294 if (!(vflags & HPTE_V_BOLTED)) 295 DBG_LOW("hpte_insert(group=%lx, va=%016lx, pa=%016lx, " 296 "rflags=%lx, vflags=%lx, psize=%d)\n", 297 hpte_group, va, pa, rflags, vflags, psize); 298 299 hpte_v = hpte_encode_v(va, psize, ssize) | vflags | HPTE_V_VALID; 300 hpte_r = hpte_encode_r(pa, psize) | rflags; 301 302 if (!(vflags & HPTE_V_BOLTED)) 303 DBG_LOW(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r); 304 305 /* Now fill in the actual HPTE */ 306 /* Set CEC cookie to 0 */ 307 /* Zero page = 0 */ 308 /* I-cache Invalidate = 0 */ 309 /* I-cache synchronize = 0 */ 310 /* Exact = 0 */ 311 flags = 0; 312 313 /* Make pHyp happy */ 314 if (rflags & (_PAGE_GUARDED|_PAGE_NO_CACHE)) 315 hpte_r &= ~_PAGE_COHERENT; 316 317 lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot); 318 if (unlikely(lpar_rc == H_PTEG_FULL)) { 319 if (!(vflags & HPTE_V_BOLTED)) 320 DBG_LOW(" full\n"); 321 return -1; 322 } 323 324 /* 325 * Since we try and ioremap PHBs we don't own, the pte insert 326 * will fail. However we must catch the failure in hash_page 327 * or we will loop forever, so return -2 in this case. 328 */ 329 if (unlikely(lpar_rc != H_SUCCESS)) { 330 if (!(vflags & HPTE_V_BOLTED)) 331 DBG_LOW(" lpar err %d\n", lpar_rc); 332 return -2; 333 } 334 if (!(vflags & HPTE_V_BOLTED)) 335 DBG_LOW(" -> slot: %d\n", slot & 7); 336 337 /* Because of iSeries, we have to pass down the secondary 338 * bucket bit here as well 339 */ 340 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3); 341 } 342 343 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock); 344 345 static long pSeries_lpar_hpte_remove(unsigned long hpte_group) 346 { 347 unsigned long slot_offset; 348 unsigned long lpar_rc; 349 int i; 350 unsigned long dummy1, dummy2; 351 352 /* pick a random slot to start at */ 353 slot_offset = mftb() & 0x7; 354 355 for (i = 0; i < HPTES_PER_GROUP; i++) { 356 357 /* don't remove a bolted entry */ 358 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset, 359 (0x1UL << 4), &dummy1, &dummy2); 360 if (lpar_rc == H_SUCCESS) 361 return i; 362 BUG_ON(lpar_rc != H_NOT_FOUND); 363 364 slot_offset++; 365 slot_offset &= 0x7; 366 } 367 368 return -1; 369 } 370 371 static void pSeries_lpar_hptab_clear(void) 372 { 373 unsigned long size_bytes = 1UL << ppc64_pft_size; 374 unsigned long hpte_count = size_bytes >> 4; 375 unsigned long dummy1, dummy2, dword0; 376 long lpar_rc; 377 int i; 378 379 /* TODO: Use bulk call */ 380 for (i = 0; i < hpte_count; i++) { 381 /* dont remove HPTEs with VRMA mappings */ 382 lpar_rc = plpar_pte_remove_raw(H_ANDCOND, i, HPTE_V_1TB_SEG, 383 &dummy1, &dummy2); 384 if (lpar_rc == H_NOT_FOUND) { 385 lpar_rc = plpar_pte_read_raw(0, i, &dword0, &dummy1); 386 if (!lpar_rc && ((dword0 & HPTE_V_VRMA_MASK) 387 != HPTE_V_VRMA_MASK)) 388 /* Can be hpte for 1TB Seg. So remove it */ 389 plpar_pte_remove_raw(0, i, 0, &dummy1, &dummy2); 390 } 391 } 392 } 393 394 /* 395 * This computes the AVPN and B fields of the first dword of a HPTE, 396 * for use when we want to match an existing PTE. The bottom 7 bits 397 * of the returned value are zero. 398 */ 399 static inline unsigned long hpte_encode_avpn(unsigned long va, int psize, 400 int ssize) 401 { 402 unsigned long v; 403 404 v = (va >> 23) & ~(mmu_psize_defs[psize].avpnm); 405 v <<= HPTE_V_AVPN_SHIFT; 406 v |= ((unsigned long) ssize) << HPTE_V_SSIZE_SHIFT; 407 return v; 408 } 409 410 /* 411 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and 412 * the low 3 bits of flags happen to line up. So no transform is needed. 413 * We can probably optimize here and assume the high bits of newpp are 414 * already zero. For now I am paranoid. 415 */ 416 static long pSeries_lpar_hpte_updatepp(unsigned long slot, 417 unsigned long newpp, 418 unsigned long va, 419 int psize, int ssize, int local) 420 { 421 unsigned long lpar_rc; 422 unsigned long flags = (newpp & 7) | H_AVPN; 423 unsigned long want_v; 424 425 want_v = hpte_encode_avpn(va, psize, ssize); 426 427 DBG_LOW(" update: avpnv=%016lx, hash=%016lx, f=%x, psize: %d ... ", 428 want_v, slot, flags, psize); 429 430 lpar_rc = plpar_pte_protect(flags, slot, want_v); 431 432 if (lpar_rc == H_NOT_FOUND) { 433 DBG_LOW("not found !\n"); 434 return -1; 435 } 436 437 DBG_LOW("ok\n"); 438 439 BUG_ON(lpar_rc != H_SUCCESS); 440 441 return 0; 442 } 443 444 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot) 445 { 446 unsigned long dword0; 447 unsigned long lpar_rc; 448 unsigned long dummy_word1; 449 unsigned long flags; 450 451 /* Read 1 pte at a time */ 452 /* Do not need RPN to logical page translation */ 453 /* No cross CEC PFT access */ 454 flags = 0; 455 456 lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1); 457 458 BUG_ON(lpar_rc != H_SUCCESS); 459 460 return dword0; 461 } 462 463 static long pSeries_lpar_hpte_find(unsigned long va, int psize, int ssize) 464 { 465 unsigned long hash; 466 unsigned long i; 467 long slot; 468 unsigned long want_v, hpte_v; 469 470 hash = hpt_hash(va, mmu_psize_defs[psize].shift, ssize); 471 want_v = hpte_encode_avpn(va, psize, ssize); 472 473 /* Bolted entries are always in the primary group */ 474 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 475 for (i = 0; i < HPTES_PER_GROUP; i++) { 476 hpte_v = pSeries_lpar_hpte_getword0(slot); 477 478 if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID)) 479 /* HPTE matches */ 480 return slot; 481 ++slot; 482 } 483 484 return -1; 485 } 486 487 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp, 488 unsigned long ea, 489 int psize, int ssize) 490 { 491 unsigned long lpar_rc, slot, vsid, va, flags; 492 493 vsid = get_kernel_vsid(ea, ssize); 494 va = hpt_va(ea, vsid, ssize); 495 496 slot = pSeries_lpar_hpte_find(va, psize, ssize); 497 BUG_ON(slot == -1); 498 499 flags = newpp & 7; 500 lpar_rc = plpar_pte_protect(flags, slot, 0); 501 502 BUG_ON(lpar_rc != H_SUCCESS); 503 } 504 505 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va, 506 int psize, int ssize, int local) 507 { 508 unsigned long want_v; 509 unsigned long lpar_rc; 510 unsigned long dummy1, dummy2; 511 512 DBG_LOW(" inval : slot=%lx, va=%016lx, psize: %d, local: %d", 513 slot, va, psize, local); 514 515 want_v = hpte_encode_avpn(va, psize, ssize); 516 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2); 517 if (lpar_rc == H_NOT_FOUND) 518 return; 519 520 BUG_ON(lpar_rc != H_SUCCESS); 521 } 522 523 /* Flag bits for H_BULK_REMOVE */ 524 #define HBR_REQUEST 0x4000000000000000UL 525 #define HBR_RESPONSE 0x8000000000000000UL 526 #define HBR_END 0xc000000000000000UL 527 #define HBR_AVPN 0x0200000000000000UL 528 #define HBR_ANDCOND 0x0100000000000000UL 529 530 /* 531 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie 532 * lock. 533 */ 534 static void pSeries_lpar_flush_hash_range(unsigned long number, int local) 535 { 536 unsigned long i, pix, rc; 537 unsigned long flags = 0; 538 struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch); 539 int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE); 540 unsigned long param[9]; 541 unsigned long va; 542 unsigned long hash, index, shift, hidx, slot; 543 real_pte_t pte; 544 int psize, ssize; 545 546 if (lock_tlbie) 547 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 548 549 psize = batch->psize; 550 ssize = batch->ssize; 551 pix = 0; 552 for (i = 0; i < number; i++) { 553 va = batch->vaddr[i]; 554 pte = batch->pte[i]; 555 pte_iterate_hashed_subpages(pte, psize, va, index, shift) { 556 hash = hpt_hash(va, shift, ssize); 557 hidx = __rpte_to_hidx(pte, index); 558 if (hidx & _PTEIDX_SECONDARY) 559 hash = ~hash; 560 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 561 slot += hidx & _PTEIDX_GROUP_IX; 562 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 563 pSeries_lpar_hpte_invalidate(slot, va, psize, 564 ssize, local); 565 } else { 566 param[pix] = HBR_REQUEST | HBR_AVPN | slot; 567 param[pix+1] = hpte_encode_avpn(va, psize, 568 ssize); 569 pix += 2; 570 if (pix == 8) { 571 rc = plpar_hcall9(H_BULK_REMOVE, param, 572 param[0], param[1], param[2], 573 param[3], param[4], param[5], 574 param[6], param[7]); 575 BUG_ON(rc != H_SUCCESS); 576 pix = 0; 577 } 578 } 579 } pte_iterate_hashed_end(); 580 } 581 if (pix) { 582 param[pix] = HBR_END; 583 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], 584 param[2], param[3], param[4], param[5], 585 param[6], param[7]); 586 BUG_ON(rc != H_SUCCESS); 587 } 588 589 if (lock_tlbie) 590 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 591 } 592 593 void __init hpte_init_lpar(void) 594 { 595 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate; 596 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp; 597 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp; 598 ppc_md.hpte_insert = pSeries_lpar_hpte_insert; 599 ppc_md.hpte_remove = pSeries_lpar_hpte_remove; 600 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range; 601 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear; 602 } 603