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 /* Enables debugging of low-level hash table routines - careful! */ 23 #undef DEBUG 24 25 #include <linux/kernel.h> 26 #include <linux/dma-mapping.h> 27 #include <linux/console.h> 28 #include <asm/processor.h> 29 #include <asm/mmu.h> 30 #include <asm/page.h> 31 #include <asm/pgtable.h> 32 #include <asm/machdep.h> 33 #include <asm/abs_addr.h> 34 #include <asm/mmu_context.h> 35 #include <asm/iommu.h> 36 #include <asm/tlbflush.h> 37 #include <asm/tlb.h> 38 #include <asm/prom.h> 39 #include <asm/cputable.h> 40 #include <asm/udbg.h> 41 #include <asm/smp.h> 42 43 #include "plpar_wrappers.h" 44 #include "pseries.h" 45 46 47 /* in hvCall.S */ 48 EXPORT_SYMBOL(plpar_hcall); 49 EXPORT_SYMBOL(plpar_hcall9); 50 EXPORT_SYMBOL(plpar_hcall_norets); 51 52 extern void pSeries_find_serial_port(void); 53 54 55 static int vtermno; /* virtual terminal# for udbg */ 56 57 #define __ALIGNED__ __attribute__((__aligned__(sizeof(long)))) 58 static void udbg_hvsi_putc(char c) 59 { 60 /* packet's seqno isn't used anyways */ 61 uint8_t packet[] __ALIGNED__ = { 0xff, 5, 0, 0, c }; 62 int rc; 63 64 if (c == '\n') 65 udbg_hvsi_putc('\r'); 66 67 do { 68 rc = plpar_put_term_char(vtermno, sizeof(packet), packet); 69 } while (rc == H_BUSY); 70 } 71 72 static long hvsi_udbg_buf_len; 73 static uint8_t hvsi_udbg_buf[256]; 74 75 static int udbg_hvsi_getc_poll(void) 76 { 77 unsigned char ch; 78 int rc, i; 79 80 if (hvsi_udbg_buf_len == 0) { 81 rc = plpar_get_term_char(vtermno, &hvsi_udbg_buf_len, hvsi_udbg_buf); 82 if (rc != H_SUCCESS || hvsi_udbg_buf[0] != 0xff) { 83 /* bad read or non-data packet */ 84 hvsi_udbg_buf_len = 0; 85 } else { 86 /* remove the packet header */ 87 for (i = 4; i < hvsi_udbg_buf_len; i++) 88 hvsi_udbg_buf[i-4] = hvsi_udbg_buf[i]; 89 hvsi_udbg_buf_len -= 4; 90 } 91 } 92 93 if (hvsi_udbg_buf_len <= 0 || hvsi_udbg_buf_len > 256) { 94 /* no data ready */ 95 hvsi_udbg_buf_len = 0; 96 return -1; 97 } 98 99 ch = hvsi_udbg_buf[0]; 100 /* shift remaining data down */ 101 for (i = 1; i < hvsi_udbg_buf_len; i++) { 102 hvsi_udbg_buf[i-1] = hvsi_udbg_buf[i]; 103 } 104 hvsi_udbg_buf_len--; 105 106 return ch; 107 } 108 109 static int udbg_hvsi_getc(void) 110 { 111 int ch; 112 for (;;) { 113 ch = udbg_hvsi_getc_poll(); 114 if (ch == -1) { 115 /* This shouldn't be needed...but... */ 116 volatile unsigned long delay; 117 for (delay=0; delay < 2000000; delay++) 118 ; 119 } else { 120 return ch; 121 } 122 } 123 } 124 125 static void udbg_putcLP(char c) 126 { 127 char buf[16]; 128 unsigned long rc; 129 130 if (c == '\n') 131 udbg_putcLP('\r'); 132 133 buf[0] = c; 134 do { 135 rc = plpar_put_term_char(vtermno, 1, buf); 136 } while(rc == H_BUSY); 137 } 138 139 /* Buffered chars getc */ 140 static long inbuflen; 141 static long inbuf[2]; /* must be 2 longs */ 142 143 static int udbg_getc_pollLP(void) 144 { 145 /* The interface is tricky because it may return up to 16 chars. 146 * We save them statically for future calls to udbg_getc(). 147 */ 148 char ch, *buf = (char *)inbuf; 149 int i; 150 long rc; 151 if (inbuflen == 0) { 152 /* get some more chars. */ 153 inbuflen = 0; 154 rc = plpar_get_term_char(vtermno, &inbuflen, buf); 155 if (rc != H_SUCCESS) 156 inbuflen = 0; /* otherwise inbuflen is garbage */ 157 } 158 if (inbuflen <= 0 || inbuflen > 16) { 159 /* Catch error case as well as other oddities (corruption) */ 160 inbuflen = 0; 161 return -1; 162 } 163 ch = buf[0]; 164 for (i = 1; i < inbuflen; i++) /* shuffle them down. */ 165 buf[i-1] = buf[i]; 166 inbuflen--; 167 return ch; 168 } 169 170 static int udbg_getcLP(void) 171 { 172 int ch; 173 for (;;) { 174 ch = udbg_getc_pollLP(); 175 if (ch == -1) { 176 /* This shouldn't be needed...but... */ 177 volatile unsigned long delay; 178 for (delay=0; delay < 2000000; delay++) 179 ; 180 } else { 181 return ch; 182 } 183 } 184 } 185 186 /* call this from early_init() for a working debug console on 187 * vterm capable LPAR machines 188 */ 189 void __init udbg_init_debug_lpar(void) 190 { 191 vtermno = 0; 192 udbg_putc = udbg_putcLP; 193 udbg_getc = udbg_getcLP; 194 udbg_getc_poll = udbg_getc_pollLP; 195 196 register_early_udbg_console(); 197 } 198 199 /* returns 0 if couldn't find or use /chosen/stdout as console */ 200 void __init find_udbg_vterm(void) 201 { 202 struct device_node *stdout_node; 203 const u32 *termno; 204 const char *name; 205 206 /* find the boot console from /chosen/stdout */ 207 if (!of_chosen) 208 return; 209 name = of_get_property(of_chosen, "linux,stdout-path", NULL); 210 if (name == NULL) 211 return; 212 stdout_node = of_find_node_by_path(name); 213 if (!stdout_node) 214 return; 215 name = of_get_property(stdout_node, "name", NULL); 216 if (!name) { 217 printk(KERN_WARNING "stdout node missing 'name' property!\n"); 218 goto out; 219 } 220 221 /* Check if it's a virtual terminal */ 222 if (strncmp(name, "vty", 3) != 0) 223 goto out; 224 termno = of_get_property(stdout_node, "reg", NULL); 225 if (termno == NULL) 226 goto out; 227 vtermno = termno[0]; 228 229 if (of_device_is_compatible(stdout_node, "hvterm1")) { 230 udbg_putc = udbg_putcLP; 231 udbg_getc = udbg_getcLP; 232 udbg_getc_poll = udbg_getc_pollLP; 233 add_preferred_console("hvc", termno[0] & 0xff, NULL); 234 } else if (of_device_is_compatible(stdout_node, "hvterm-protocol")) { 235 vtermno = termno[0]; 236 udbg_putc = udbg_hvsi_putc; 237 udbg_getc = udbg_hvsi_getc; 238 udbg_getc_poll = udbg_hvsi_getc_poll; 239 add_preferred_console("hvsi", termno[0] & 0xff, NULL); 240 } 241 out: 242 of_node_put(stdout_node); 243 } 244 245 void vpa_init(int cpu) 246 { 247 int hwcpu = get_hard_smp_processor_id(cpu); 248 unsigned long addr; 249 long ret; 250 251 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 252 lppaca[cpu].vmxregs_in_use = 1; 253 254 addr = __pa(&lppaca[cpu]); 255 ret = register_vpa(hwcpu, addr); 256 257 if (ret) { 258 printk(KERN_ERR "WARNING: vpa_init: VPA registration for " 259 "cpu %d (hw %d) of area %lx returns %ld\n", 260 cpu, hwcpu, addr, ret); 261 return; 262 } 263 /* 264 * PAPR says this feature is SLB-Buffer but firmware never 265 * reports that. All SPLPAR support SLB shadow buffer. 266 */ 267 addr = __pa(&slb_shadow[cpu]); 268 if (firmware_has_feature(FW_FEATURE_SPLPAR)) { 269 ret = register_slb_shadow(hwcpu, addr); 270 if (ret) 271 printk(KERN_ERR 272 "WARNING: vpa_init: SLB shadow buffer " 273 "registration for cpu %d (hw %d) of area %lx " 274 "returns %ld\n", cpu, hwcpu, addr, ret); 275 } 276 } 277 278 static long pSeries_lpar_hpte_insert(unsigned long hpte_group, 279 unsigned long va, unsigned long pa, 280 unsigned long rflags, unsigned long vflags, 281 int psize, int ssize) 282 { 283 unsigned long lpar_rc; 284 unsigned long flags; 285 unsigned long slot; 286 unsigned long hpte_v, hpte_r; 287 288 if (!(vflags & HPTE_V_BOLTED)) 289 pr_devel("hpte_insert(group=%lx, va=%016lx, pa=%016lx, " 290 "rflags=%lx, vflags=%lx, psize=%d)\n", 291 hpte_group, va, pa, rflags, vflags, psize); 292 293 hpte_v = hpte_encode_v(va, psize, ssize) | vflags | HPTE_V_VALID; 294 hpte_r = hpte_encode_r(pa, psize) | rflags; 295 296 if (!(vflags & HPTE_V_BOLTED)) 297 pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r); 298 299 /* Now fill in the actual HPTE */ 300 /* Set CEC cookie to 0 */ 301 /* Zero page = 0 */ 302 /* I-cache Invalidate = 0 */ 303 /* I-cache synchronize = 0 */ 304 /* Exact = 0 */ 305 flags = 0; 306 307 /* Make pHyp happy */ 308 if ((rflags & _PAGE_NO_CACHE) & !(rflags & _PAGE_WRITETHRU)) 309 hpte_r &= ~_PAGE_COHERENT; 310 311 lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot); 312 if (unlikely(lpar_rc == H_PTEG_FULL)) { 313 if (!(vflags & HPTE_V_BOLTED)) 314 pr_devel(" full\n"); 315 return -1; 316 } 317 318 /* 319 * Since we try and ioremap PHBs we don't own, the pte insert 320 * will fail. However we must catch the failure in hash_page 321 * or we will loop forever, so return -2 in this case. 322 */ 323 if (unlikely(lpar_rc != H_SUCCESS)) { 324 if (!(vflags & HPTE_V_BOLTED)) 325 pr_devel(" lpar err %lu\n", lpar_rc); 326 return -2; 327 } 328 if (!(vflags & HPTE_V_BOLTED)) 329 pr_devel(" -> slot: %lu\n", slot & 7); 330 331 /* Because of iSeries, we have to pass down the secondary 332 * bucket bit here as well 333 */ 334 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3); 335 } 336 337 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock); 338 339 static long pSeries_lpar_hpte_remove(unsigned long hpte_group) 340 { 341 unsigned long slot_offset; 342 unsigned long lpar_rc; 343 int i; 344 unsigned long dummy1, dummy2; 345 346 /* pick a random slot to start at */ 347 slot_offset = mftb() & 0x7; 348 349 for (i = 0; i < HPTES_PER_GROUP; i++) { 350 351 /* don't remove a bolted entry */ 352 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset, 353 (0x1UL << 4), &dummy1, &dummy2); 354 if (lpar_rc == H_SUCCESS) 355 return i; 356 BUG_ON(lpar_rc != H_NOT_FOUND); 357 358 slot_offset++; 359 slot_offset &= 0x7; 360 } 361 362 return -1; 363 } 364 365 static void pSeries_lpar_hptab_clear(void) 366 { 367 unsigned long size_bytes = 1UL << ppc64_pft_size; 368 unsigned long hpte_count = size_bytes >> 4; 369 unsigned long dummy1, dummy2, dword0; 370 long lpar_rc; 371 int i; 372 373 /* TODO: Use bulk call */ 374 for (i = 0; i < hpte_count; i++) { 375 /* dont remove HPTEs with VRMA mappings */ 376 lpar_rc = plpar_pte_remove_raw(H_ANDCOND, i, HPTE_V_1TB_SEG, 377 &dummy1, &dummy2); 378 if (lpar_rc == H_NOT_FOUND) { 379 lpar_rc = plpar_pte_read_raw(0, i, &dword0, &dummy1); 380 if (!lpar_rc && ((dword0 & HPTE_V_VRMA_MASK) 381 != HPTE_V_VRMA_MASK)) 382 /* Can be hpte for 1TB Seg. So remove it */ 383 plpar_pte_remove_raw(0, i, 0, &dummy1, &dummy2); 384 } 385 } 386 } 387 388 /* 389 * This computes the AVPN and B fields of the first dword of a HPTE, 390 * for use when we want to match an existing PTE. The bottom 7 bits 391 * of the returned value are zero. 392 */ 393 static inline unsigned long hpte_encode_avpn(unsigned long va, int psize, 394 int ssize) 395 { 396 unsigned long v; 397 398 v = (va >> 23) & ~(mmu_psize_defs[psize].avpnm); 399 v <<= HPTE_V_AVPN_SHIFT; 400 v |= ((unsigned long) ssize) << HPTE_V_SSIZE_SHIFT; 401 return v; 402 } 403 404 /* 405 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and 406 * the low 3 bits of flags happen to line up. So no transform is needed. 407 * We can probably optimize here and assume the high bits of newpp are 408 * already zero. For now I am paranoid. 409 */ 410 static long pSeries_lpar_hpte_updatepp(unsigned long slot, 411 unsigned long newpp, 412 unsigned long va, 413 int psize, int ssize, int local) 414 { 415 unsigned long lpar_rc; 416 unsigned long flags = (newpp & 7) | H_AVPN; 417 unsigned long want_v; 418 419 want_v = hpte_encode_avpn(va, psize, ssize); 420 421 pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...", 422 want_v, slot, flags, psize); 423 424 lpar_rc = plpar_pte_protect(flags, slot, want_v); 425 426 if (lpar_rc == H_NOT_FOUND) { 427 pr_devel("not found !\n"); 428 return -1; 429 } 430 431 pr_devel("ok\n"); 432 433 BUG_ON(lpar_rc != H_SUCCESS); 434 435 return 0; 436 } 437 438 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot) 439 { 440 unsigned long dword0; 441 unsigned long lpar_rc; 442 unsigned long dummy_word1; 443 unsigned long flags; 444 445 /* Read 1 pte at a time */ 446 /* Do not need RPN to logical page translation */ 447 /* No cross CEC PFT access */ 448 flags = 0; 449 450 lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1); 451 452 BUG_ON(lpar_rc != H_SUCCESS); 453 454 return dword0; 455 } 456 457 static long pSeries_lpar_hpte_find(unsigned long va, int psize, int ssize) 458 { 459 unsigned long hash; 460 unsigned long i; 461 long slot; 462 unsigned long want_v, hpte_v; 463 464 hash = hpt_hash(va, mmu_psize_defs[psize].shift, ssize); 465 want_v = hpte_encode_avpn(va, psize, ssize); 466 467 /* Bolted entries are always in the primary group */ 468 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 469 for (i = 0; i < HPTES_PER_GROUP; i++) { 470 hpte_v = pSeries_lpar_hpte_getword0(slot); 471 472 if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID)) 473 /* HPTE matches */ 474 return slot; 475 ++slot; 476 } 477 478 return -1; 479 } 480 481 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp, 482 unsigned long ea, 483 int psize, int ssize) 484 { 485 unsigned long lpar_rc, slot, vsid, va, flags; 486 487 vsid = get_kernel_vsid(ea, ssize); 488 va = hpt_va(ea, vsid, ssize); 489 490 slot = pSeries_lpar_hpte_find(va, psize, ssize); 491 BUG_ON(slot == -1); 492 493 flags = newpp & 7; 494 lpar_rc = plpar_pte_protect(flags, slot, 0); 495 496 BUG_ON(lpar_rc != H_SUCCESS); 497 } 498 499 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va, 500 int psize, int ssize, int local) 501 { 502 unsigned long want_v; 503 unsigned long lpar_rc; 504 unsigned long dummy1, dummy2; 505 506 pr_devel(" inval : slot=%lx, va=%016lx, psize: %d, local: %d\n", 507 slot, va, psize, local); 508 509 want_v = hpte_encode_avpn(va, psize, ssize); 510 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2); 511 if (lpar_rc == H_NOT_FOUND) 512 return; 513 514 BUG_ON(lpar_rc != H_SUCCESS); 515 } 516 517 static void pSeries_lpar_hpte_removebolted(unsigned long ea, 518 int psize, int ssize) 519 { 520 unsigned long slot, vsid, va; 521 522 vsid = get_kernel_vsid(ea, ssize); 523 va = hpt_va(ea, vsid, ssize); 524 525 slot = pSeries_lpar_hpte_find(va, psize, ssize); 526 BUG_ON(slot == -1); 527 528 pSeries_lpar_hpte_invalidate(slot, va, psize, ssize, 0); 529 } 530 531 /* Flag bits for H_BULK_REMOVE */ 532 #define HBR_REQUEST 0x4000000000000000UL 533 #define HBR_RESPONSE 0x8000000000000000UL 534 #define HBR_END 0xc000000000000000UL 535 #define HBR_AVPN 0x0200000000000000UL 536 #define HBR_ANDCOND 0x0100000000000000UL 537 538 /* 539 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie 540 * lock. 541 */ 542 static void pSeries_lpar_flush_hash_range(unsigned long number, int local) 543 { 544 unsigned long i, pix, rc; 545 unsigned long flags = 0; 546 struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch); 547 int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE); 548 unsigned long param[9]; 549 unsigned long va; 550 unsigned long hash, index, shift, hidx, slot; 551 real_pte_t pte; 552 int psize, ssize; 553 554 if (lock_tlbie) 555 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 556 557 psize = batch->psize; 558 ssize = batch->ssize; 559 pix = 0; 560 for (i = 0; i < number; i++) { 561 va = batch->vaddr[i]; 562 pte = batch->pte[i]; 563 pte_iterate_hashed_subpages(pte, psize, va, index, shift) { 564 hash = hpt_hash(va, shift, ssize); 565 hidx = __rpte_to_hidx(pte, index); 566 if (hidx & _PTEIDX_SECONDARY) 567 hash = ~hash; 568 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 569 slot += hidx & _PTEIDX_GROUP_IX; 570 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 571 pSeries_lpar_hpte_invalidate(slot, va, psize, 572 ssize, local); 573 } else { 574 param[pix] = HBR_REQUEST | HBR_AVPN | slot; 575 param[pix+1] = hpte_encode_avpn(va, psize, 576 ssize); 577 pix += 2; 578 if (pix == 8) { 579 rc = plpar_hcall9(H_BULK_REMOVE, param, 580 param[0], param[1], param[2], 581 param[3], param[4], param[5], 582 param[6], param[7]); 583 BUG_ON(rc != H_SUCCESS); 584 pix = 0; 585 } 586 } 587 } pte_iterate_hashed_end(); 588 } 589 if (pix) { 590 param[pix] = HBR_END; 591 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], 592 param[2], param[3], param[4], param[5], 593 param[6], param[7]); 594 BUG_ON(rc != H_SUCCESS); 595 } 596 597 if (lock_tlbie) 598 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 599 } 600 601 void __init hpte_init_lpar(void) 602 { 603 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate; 604 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp; 605 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp; 606 ppc_md.hpte_insert = pSeries_lpar_hpte_insert; 607 ppc_md.hpte_remove = pSeries_lpar_hpte_remove; 608 ppc_md.hpte_removebolted = pSeries_lpar_hpte_removebolted; 609 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range; 610 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear; 611 } 612 613 #ifdef CONFIG_PPC_SMLPAR 614 #define CMO_FREE_HINT_DEFAULT 1 615 static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT; 616 617 static int __init cmo_free_hint(char *str) 618 { 619 char *parm; 620 parm = strstrip(str); 621 622 if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) { 623 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n"); 624 cmo_free_hint_flag = 0; 625 return 1; 626 } 627 628 cmo_free_hint_flag = 1; 629 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n"); 630 631 if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0) 632 return 1; 633 634 return 0; 635 } 636 637 __setup("cmo_free_hint=", cmo_free_hint); 638 639 static void pSeries_set_page_state(struct page *page, int order, 640 unsigned long state) 641 { 642 int i, j; 643 unsigned long cmo_page_sz, addr; 644 645 cmo_page_sz = cmo_get_page_size(); 646 addr = __pa((unsigned long)page_address(page)); 647 648 for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) { 649 for (j = 0; j < PAGE_SIZE; j += cmo_page_sz) 650 plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0); 651 } 652 } 653 654 void arch_free_page(struct page *page, int order) 655 { 656 if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO)) 657 return; 658 659 pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED); 660 } 661 EXPORT_SYMBOL(arch_free_page); 662 663 #endif 664