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/abs_addr.h> 39#include <asm/cputable.h> 40#include <asm/udbg.h> 41#include <asm/smp.h> 42 43#include "plpar_wrappers.h" 44 45#ifdef DEBUG_LOW 46#define DBG_LOW(fmt...) do { udbg_printf(fmt); } while(0) 47#else 48#define DBG_LOW(fmt...) do { } while(0) 49#endif 50 51/* in hvCall.S */ 52EXPORT_SYMBOL(plpar_hcall); 53EXPORT_SYMBOL(plpar_hcall9); 54EXPORT_SYMBOL(plpar_hcall_norets); 55 56extern void pSeries_find_serial_port(void); 57 58 59int vtermno; /* virtual terminal# for udbg */ 60 61#define __ALIGNED__ __attribute__((__aligned__(sizeof(long)))) 62static void udbg_hvsi_putc(char c) 63{ 64 /* packet's seqno isn't used anyways */ 65 uint8_t packet[] __ALIGNED__ = { 0xff, 5, 0, 0, c }; 66 int rc; 67 68 if (c == '\n') 69 udbg_hvsi_putc('\r'); 70 71 do { 72 rc = plpar_put_term_char(vtermno, sizeof(packet), packet); 73 } while (rc == H_BUSY); 74} 75 76static long hvsi_udbg_buf_len; 77static uint8_t hvsi_udbg_buf[256]; 78 79static int udbg_hvsi_getc_poll(void) 80{ 81 unsigned char ch; 82 int rc, i; 83 84 if (hvsi_udbg_buf_len == 0) { 85 rc = plpar_get_term_char(vtermno, &hvsi_udbg_buf_len, hvsi_udbg_buf); 86 if (rc != H_SUCCESS || hvsi_udbg_buf[0] != 0xff) { 87 /* bad read or non-data packet */ 88 hvsi_udbg_buf_len = 0; 89 } else { 90 /* remove the packet header */ 91 for (i = 4; i < hvsi_udbg_buf_len; i++) 92 hvsi_udbg_buf[i-4] = hvsi_udbg_buf[i]; 93 hvsi_udbg_buf_len -= 4; 94 } 95 } 96 97 if (hvsi_udbg_buf_len <= 0 || hvsi_udbg_buf_len > 256) { 98 /* no data ready */ 99 hvsi_udbg_buf_len = 0; 100 return -1; 101 } 102 103 ch = hvsi_udbg_buf[0]; 104 /* shift remaining data down */ 105 for (i = 1; i < hvsi_udbg_buf_len; i++) { 106 hvsi_udbg_buf[i-1] = hvsi_udbg_buf[i]; 107 } 108 hvsi_udbg_buf_len--; 109 110 return ch; 111} 112 113static int udbg_hvsi_getc(void) 114{ 115 int ch; 116 for (;;) { 117 ch = udbg_hvsi_getc_poll(); 118 if (ch == -1) { 119 /* This shouldn't be needed...but... */ 120 volatile unsigned long delay; 121 for (delay=0; delay < 2000000; delay++) 122 ; 123 } else { 124 return ch; 125 } 126 } 127} 128 129static void udbg_putcLP(char c) 130{ 131 char buf[16]; 132 unsigned long rc; 133 134 if (c == '\n') 135 udbg_putcLP('\r'); 136 137 buf[0] = c; 138 do { 139 rc = plpar_put_term_char(vtermno, 1, buf); 140 } while(rc == H_BUSY); 141} 142 143/* Buffered chars getc */ 144static long inbuflen; 145static long inbuf[2]; /* must be 2 longs */ 146 147static int udbg_getc_pollLP(void) 148{ 149 /* The interface is tricky because it may return up to 16 chars. 150 * We save them statically for future calls to udbg_getc(). 151 */ 152 char ch, *buf = (char *)inbuf; 153 int i; 154 long rc; 155 if (inbuflen == 0) { 156 /* get some more chars. */ 157 inbuflen = 0; 158 rc = plpar_get_term_char(vtermno, &inbuflen, buf); 159 if (rc != H_SUCCESS) 160 inbuflen = 0; /* otherwise inbuflen is garbage */ 161 } 162 if (inbuflen <= 0 || inbuflen > 16) { 163 /* Catch error case as well as other oddities (corruption) */ 164 inbuflen = 0; 165 return -1; 166 } 167 ch = buf[0]; 168 for (i = 1; i < inbuflen; i++) /* shuffle them down. */ 169 buf[i-1] = buf[i]; 170 inbuflen--; 171 return ch; 172} 173 174static int udbg_getcLP(void) 175{ 176 int ch; 177 for (;;) { 178 ch = udbg_getc_pollLP(); 179 if (ch == -1) { 180 /* This shouldn't be needed...but... */ 181 volatile unsigned long delay; 182 for (delay=0; delay < 2000000; delay++) 183 ; 184 } else { 185 return ch; 186 } 187 } 188} 189 190/* call this from early_init() for a working debug console on 191 * vterm capable LPAR machines 192 */ 193void __init udbg_init_debug_lpar(void) 194{ 195 vtermno = 0; 196 udbg_putc = udbg_putcLP; 197 udbg_getc = udbg_getcLP; 198 udbg_getc_poll = udbg_getc_pollLP; 199} 200 201/* returns 0 if couldn't find or use /chosen/stdout as console */ 202void __init find_udbg_vterm(void) 203{ 204 struct device_node *stdout_node; 205 const u32 *termno; 206 const char *name; 207 int add_console; 208 209 /* find the boot console from /chosen/stdout */ 210 if (!of_chosen) 211 return; 212 name = of_get_property(of_chosen, "linux,stdout-path", NULL); 213 if (name == NULL) 214 return; 215 stdout_node = of_find_node_by_path(name); 216 if (!stdout_node) 217 return; 218 name = of_get_property(stdout_node, "name", NULL); 219 if (!name) { 220 printk(KERN_WARNING "stdout node missing 'name' property!\n"); 221 goto out; 222 } 223 /* The user has requested a console so this is already set up. */ 224 add_console = !strstr(cmd_line, "console="); 225 226 /* Check if it's a virtual terminal */ 227 if (strncmp(name, "vty", 3) != 0) 228 goto out; 229 termno = of_get_property(stdout_node, "reg", NULL); 230 if (termno == NULL) 231 goto out; 232 vtermno = termno[0]; 233 234 if (of_device_is_compatible(stdout_node, "hvterm1")) { 235 udbg_putc = udbg_putcLP; 236 udbg_getc = udbg_getcLP; 237 udbg_getc_poll = udbg_getc_pollLP; 238 if (add_console) 239 add_preferred_console("hvc", termno[0] & 0xff, NULL); 240 } else if (of_device_is_compatible(stdout_node, "hvterm-protocol")) { 241 vtermno = termno[0]; 242 udbg_putc = udbg_hvsi_putc; 243 udbg_getc = udbg_hvsi_getc; 244 udbg_getc_poll = udbg_hvsi_getc_poll; 245 if (add_console) 246 add_preferred_console("hvsi", termno[0] & 0xff, NULL); 247 } 248out: 249 of_node_put(stdout_node); 250} 251 252void vpa_init(int cpu) 253{ 254 int hwcpu = get_hard_smp_processor_id(cpu); 255 unsigned long addr; 256 long ret; 257 258 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 259 lppaca[cpu].vmxregs_in_use = 1; 260 261 addr = __pa(&lppaca[cpu]); 262 ret = register_vpa(hwcpu, addr); 263 264 if (ret) { 265 printk(KERN_ERR "WARNING: vpa_init: VPA registration for " 266 "cpu %d (hw %d) of area %lx returns %ld\n", 267 cpu, hwcpu, addr, ret); 268 return; 269 } 270 /* 271 * PAPR says this feature is SLB-Buffer but firmware never 272 * reports that. All SPLPAR support SLB shadow buffer. 273 */ 274 addr = __pa(&slb_shadow[cpu]); 275 if (firmware_has_feature(FW_FEATURE_SPLPAR)) { 276 ret = register_slb_shadow(hwcpu, addr); 277 if (ret) 278 printk(KERN_ERR 279 "WARNING: vpa_init: SLB shadow buffer " 280 "registration for cpu %d (hw %d) of area %lx " 281 "returns %ld\n", cpu, hwcpu, addr, ret); 282 } 283} 284 285static long pSeries_lpar_hpte_insert(unsigned long hpte_group, 286 unsigned long va, unsigned long pa, 287 unsigned long rflags, unsigned long vflags, 288 int psize) 289{ 290 unsigned long lpar_rc; 291 unsigned long flags; 292 unsigned long slot; 293 unsigned long hpte_v, hpte_r; 294 295 if (!(vflags & HPTE_V_BOLTED)) 296 DBG_LOW("hpte_insert(group=%lx, va=%016lx, pa=%016lx, " 297 "rflags=%lx, vflags=%lx, psize=%d)\n", 298 hpte_group, va, pa, rflags, vflags, psize); 299 300 hpte_v = hpte_encode_v(va, psize) | vflags | HPTE_V_VALID; 301 hpte_r = hpte_encode_r(pa, psize) | rflags; 302 303 if (!(vflags & HPTE_V_BOLTED)) 304 DBG_LOW(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r); 305 306 /* Now fill in the actual HPTE */ 307 /* Set CEC cookie to 0 */ 308 /* Zero page = 0 */ 309 /* I-cache Invalidate = 0 */ 310 /* I-cache synchronize = 0 */ 311 /* Exact = 0 */ 312 flags = 0; 313 314 /* Make pHyp happy */ 315 if (rflags & (_PAGE_GUARDED|_PAGE_NO_CACHE)) 316 hpte_r &= ~_PAGE_COHERENT; 317 318 lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot); 319 if (unlikely(lpar_rc == H_PTEG_FULL)) { 320 if (!(vflags & HPTE_V_BOLTED)) 321 DBG_LOW(" full\n"); 322 return -1; 323 } 324 325 /* 326 * Since we try and ioremap PHBs we don't own, the pte insert 327 * will fail. However we must catch the failure in hash_page 328 * or we will loop forever, so return -2 in this case. 329 */ 330 if (unlikely(lpar_rc != H_SUCCESS)) { 331 if (!(vflags & HPTE_V_BOLTED)) 332 DBG_LOW(" lpar err %d\n", lpar_rc); 333 return -2; 334 } 335 if (!(vflags & HPTE_V_BOLTED)) 336 DBG_LOW(" -> slot: %d\n", slot & 7); 337 338 /* Because of iSeries, we have to pass down the secondary 339 * bucket bit here as well 340 */ 341 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3); 342} 343 344static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock); 345 346static long pSeries_lpar_hpte_remove(unsigned long hpte_group) 347{ 348 unsigned long slot_offset; 349 unsigned long lpar_rc; 350 int i; 351 unsigned long dummy1, dummy2; 352 353 /* pick a random slot to start at */ 354 slot_offset = mftb() & 0x7; 355 356 for (i = 0; i < HPTES_PER_GROUP; i++) { 357 358 /* don't remove a bolted entry */ 359 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset, 360 (0x1UL << 4), &dummy1, &dummy2); 361 if (lpar_rc == H_SUCCESS) 362 return i; 363 BUG_ON(lpar_rc != H_NOT_FOUND); 364 365 slot_offset++; 366 slot_offset &= 0x7; 367 } 368 369 return -1; 370} 371 372static void pSeries_lpar_hptab_clear(void) 373{ 374 unsigned long size_bytes = 1UL << ppc64_pft_size; 375 unsigned long hpte_count = size_bytes >> 4; 376 unsigned long dummy1, dummy2; 377 int i; 378 379 /* TODO: Use bulk call */ 380 for (i = 0; i < hpte_count; i++) 381 plpar_pte_remove_raw(0, i, 0, &dummy1, &dummy2); 382} 383 384/* 385 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and 386 * the low 3 bits of flags happen to line up. So no transform is needed. 387 * We can probably optimize here and assume the high bits of newpp are 388 * already zero. For now I am paranoid. 389 */ 390static long pSeries_lpar_hpte_updatepp(unsigned long slot, 391 unsigned long newpp, 392 unsigned long va, 393 int psize, int local) 394{ 395 unsigned long lpar_rc; 396 unsigned long flags = (newpp & 7) | H_AVPN; 397 unsigned long want_v; 398 399 want_v = hpte_encode_v(va, psize); 400 401 DBG_LOW(" update: avpnv=%016lx, hash=%016lx, f=%x, psize: %d ... ", 402 want_v & HPTE_V_AVPN, slot, flags, psize); 403 404 lpar_rc = plpar_pte_protect(flags, slot, want_v & HPTE_V_AVPN); 405 406 if (lpar_rc == H_NOT_FOUND) { 407 DBG_LOW("not found !\n"); 408 return -1; 409 } 410 411 DBG_LOW("ok\n"); 412 413 BUG_ON(lpar_rc != H_SUCCESS); 414 415 return 0; 416} 417 418static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot) 419{ 420 unsigned long dword0; 421 unsigned long lpar_rc; 422 unsigned long dummy_word1; 423 unsigned long flags; 424 425 /* Read 1 pte at a time */ 426 /* Do not need RPN to logical page translation */ 427 /* No cross CEC PFT access */ 428 flags = 0; 429 430 lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1); 431 432 BUG_ON(lpar_rc != H_SUCCESS); 433 434 return dword0; 435} 436 437static long pSeries_lpar_hpte_find(unsigned long va, int psize) 438{ 439 unsigned long hash; 440 unsigned long i, j; 441 long slot; 442 unsigned long want_v, hpte_v; 443 444 hash = hpt_hash(va, mmu_psize_defs[psize].shift); 445 want_v = hpte_encode_v(va, psize); 446 447 for (j = 0; j < 2; j++) { 448 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 449 for (i = 0; i < HPTES_PER_GROUP; i++) { 450 hpte_v = pSeries_lpar_hpte_getword0(slot); 451 452 if (HPTE_V_COMPARE(hpte_v, want_v) 453 && (hpte_v & HPTE_V_VALID) 454 && (!!(hpte_v & HPTE_V_SECONDARY) == j)) { 455 /* HPTE matches */ 456 if (j) 457 slot = -slot; 458 return slot; 459 } 460 ++slot; 461 } 462 hash = ~hash; 463 } 464 465 return -1; 466} 467 468static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp, 469 unsigned long ea, 470 int psize) 471{ 472 unsigned long lpar_rc, slot, vsid, va, flags; 473 474 vsid = get_kernel_vsid(ea); 475 va = (vsid << 28) | (ea & 0x0fffffff); 476 477 slot = pSeries_lpar_hpte_find(va, psize); 478 BUG_ON(slot == -1); 479 480 flags = newpp & 7; 481 lpar_rc = plpar_pte_protect(flags, slot, 0); 482 483 BUG_ON(lpar_rc != H_SUCCESS); 484} 485 486static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va, 487 int psize, int local) 488{ 489 unsigned long want_v; 490 unsigned long lpar_rc; 491 unsigned long dummy1, dummy2; 492 493 DBG_LOW(" inval : slot=%lx, va=%016lx, psize: %d, local: %d", 494 slot, va, psize, local); 495 496 want_v = hpte_encode_v(va, psize); 497 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v & HPTE_V_AVPN, 498 &dummy1, &dummy2); 499 if (lpar_rc == H_NOT_FOUND) 500 return; 501 502 BUG_ON(lpar_rc != H_SUCCESS); 503} 504 505/* Flag bits for H_BULK_REMOVE */ 506#define HBR_REQUEST 0x4000000000000000UL 507#define HBR_RESPONSE 0x8000000000000000UL 508#define HBR_END 0xc000000000000000UL 509#define HBR_AVPN 0x0200000000000000UL 510#define HBR_ANDCOND 0x0100000000000000UL 511 512/* 513 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie 514 * lock. 515 */ 516static void pSeries_lpar_flush_hash_range(unsigned long number, int local) 517{ 518 unsigned long i, pix, rc; 519 unsigned long flags = 0; 520 struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch); 521 int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE); 522 unsigned long param[9]; 523 unsigned long va; 524 unsigned long hash, index, shift, hidx, slot; 525 real_pte_t pte; 526 int psize; 527 528 if (lock_tlbie) 529 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 530 531 psize = batch->psize; 532 pix = 0; 533 for (i = 0; i < number; i++) { 534 va = batch->vaddr[i]; 535 pte = batch->pte[i]; 536 pte_iterate_hashed_subpages(pte, psize, va, index, shift) { 537 hash = hpt_hash(va, shift); 538 hidx = __rpte_to_hidx(pte, index); 539 if (hidx & _PTEIDX_SECONDARY) 540 hash = ~hash; 541 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 542 slot += hidx & _PTEIDX_GROUP_IX; 543 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 544 pSeries_lpar_hpte_invalidate(slot, va, psize, 545 local); 546 } else { 547 param[pix] = HBR_REQUEST | HBR_AVPN | slot; 548 param[pix+1] = hpte_encode_v(va, psize) & 549 HPTE_V_AVPN; 550 pix += 2; 551 if (pix == 8) { 552 rc = plpar_hcall9(H_BULK_REMOVE, param, 553 param[0], param[1], param[2], 554 param[3], param[4], param[5], 555 param[6], param[7]); 556 BUG_ON(rc != H_SUCCESS); 557 pix = 0; 558 } 559 } 560 } pte_iterate_hashed_end(); 561 } 562 if (pix) { 563 param[pix] = HBR_END; 564 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], 565 param[2], param[3], param[4], param[5], 566 param[6], param[7]); 567 BUG_ON(rc != H_SUCCESS); 568 } 569 570 if (lock_tlbie) 571 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 572} 573 574void __init hpte_init_lpar(void) 575{ 576 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate; 577 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp; 578 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp; 579 ppc_md.hpte_insert = pSeries_lpar_hpte_insert; 580 ppc_md.hpte_remove = pSeries_lpar_hpte_remove; 581 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range; 582 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear; 583} 584