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 #include <asm/trace.h> 43 44 #include "plpar_wrappers.h" 45 #include "pseries.h" 46 47 48 /* in hvCall.S */ 49 EXPORT_SYMBOL(plpar_hcall); 50 EXPORT_SYMBOL(plpar_hcall9); 51 EXPORT_SYMBOL(plpar_hcall_norets); 52 53 extern void pSeries_find_serial_port(void); 54 55 56 static int vtermno; /* virtual terminal# for udbg */ 57 58 #define __ALIGNED__ __attribute__((__aligned__(sizeof(long)))) 59 static void udbg_hvsi_putc(char c) 60 { 61 /* packet's seqno isn't used anyways */ 62 uint8_t packet[] __ALIGNED__ = { 0xff, 5, 0, 0, c }; 63 int rc; 64 65 if (c == '\n') 66 udbg_hvsi_putc('\r'); 67 68 do { 69 rc = plpar_put_term_char(vtermno, sizeof(packet), packet); 70 } while (rc == H_BUSY); 71 } 72 73 static long hvsi_udbg_buf_len; 74 static uint8_t hvsi_udbg_buf[256]; 75 76 static int udbg_hvsi_getc_poll(void) 77 { 78 unsigned char ch; 79 int rc, i; 80 81 if (hvsi_udbg_buf_len == 0) { 82 rc = plpar_get_term_char(vtermno, &hvsi_udbg_buf_len, hvsi_udbg_buf); 83 if (rc != H_SUCCESS || hvsi_udbg_buf[0] != 0xff) { 84 /* bad read or non-data packet */ 85 hvsi_udbg_buf_len = 0; 86 } else { 87 /* remove the packet header */ 88 for (i = 4; i < hvsi_udbg_buf_len; i++) 89 hvsi_udbg_buf[i-4] = hvsi_udbg_buf[i]; 90 hvsi_udbg_buf_len -= 4; 91 } 92 } 93 94 if (hvsi_udbg_buf_len <= 0 || hvsi_udbg_buf_len > 256) { 95 /* no data ready */ 96 hvsi_udbg_buf_len = 0; 97 return -1; 98 } 99 100 ch = hvsi_udbg_buf[0]; 101 /* shift remaining data down */ 102 for (i = 1; i < hvsi_udbg_buf_len; i++) { 103 hvsi_udbg_buf[i-1] = hvsi_udbg_buf[i]; 104 } 105 hvsi_udbg_buf_len--; 106 107 return ch; 108 } 109 110 static int udbg_hvsi_getc(void) 111 { 112 int ch; 113 for (;;) { 114 ch = udbg_hvsi_getc_poll(); 115 if (ch == -1) { 116 /* This shouldn't be needed...but... */ 117 volatile unsigned long delay; 118 for (delay=0; delay < 2000000; delay++) 119 ; 120 } else { 121 return ch; 122 } 123 } 124 } 125 126 static void udbg_putcLP(char c) 127 { 128 char buf[16]; 129 unsigned long rc; 130 131 if (c == '\n') 132 udbg_putcLP('\r'); 133 134 buf[0] = c; 135 do { 136 rc = plpar_put_term_char(vtermno, 1, buf); 137 } while(rc == H_BUSY); 138 } 139 140 /* Buffered chars getc */ 141 static long inbuflen; 142 static long inbuf[2]; /* must be 2 longs */ 143 144 static int udbg_getc_pollLP(void) 145 { 146 /* The interface is tricky because it may return up to 16 chars. 147 * We save them statically for future calls to udbg_getc(). 148 */ 149 char ch, *buf = (char *)inbuf; 150 int i; 151 long rc; 152 if (inbuflen == 0) { 153 /* get some more chars. */ 154 inbuflen = 0; 155 rc = plpar_get_term_char(vtermno, &inbuflen, buf); 156 if (rc != H_SUCCESS) 157 inbuflen = 0; /* otherwise inbuflen is garbage */ 158 } 159 if (inbuflen <= 0 || inbuflen > 16) { 160 /* Catch error case as well as other oddities (corruption) */ 161 inbuflen = 0; 162 return -1; 163 } 164 ch = buf[0]; 165 for (i = 1; i < inbuflen; i++) /* shuffle them down. */ 166 buf[i-1] = buf[i]; 167 inbuflen--; 168 return ch; 169 } 170 171 static int udbg_getcLP(void) 172 { 173 int ch; 174 for (;;) { 175 ch = udbg_getc_pollLP(); 176 if (ch == -1) { 177 /* This shouldn't be needed...but... */ 178 volatile unsigned long delay; 179 for (delay=0; delay < 2000000; delay++) 180 ; 181 } else { 182 return ch; 183 } 184 } 185 } 186 187 /* call this from early_init() for a working debug console on 188 * vterm capable LPAR machines 189 */ 190 void __init udbg_init_debug_lpar(void) 191 { 192 vtermno = 0; 193 udbg_putc = udbg_putcLP; 194 udbg_getc = udbg_getcLP; 195 udbg_getc_poll = udbg_getc_pollLP; 196 197 register_early_udbg_console(); 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; 206 207 /* find the boot console from /chosen/stdout */ 208 if (!of_chosen) 209 return; 210 name = of_get_property(of_chosen, "linux,stdout-path", NULL); 211 if (name == NULL) 212 return; 213 stdout_node = of_find_node_by_path(name); 214 if (!stdout_node) 215 return; 216 name = of_get_property(stdout_node, "name", NULL); 217 if (!name) { 218 printk(KERN_WARNING "stdout node missing 'name' property!\n"); 219 goto out; 220 } 221 222 /* Check if it's a virtual terminal */ 223 if (strncmp(name, "vty", 3) != 0) 224 goto out; 225 termno = of_get_property(stdout_node, "reg", NULL); 226 if (termno == NULL) 227 goto out; 228 vtermno = termno[0]; 229 230 if (of_device_is_compatible(stdout_node, "hvterm1")) { 231 udbg_putc = udbg_putcLP; 232 udbg_getc = udbg_getcLP; 233 udbg_getc_poll = udbg_getc_pollLP; 234 add_preferred_console("hvc", termno[0] & 0xff, NULL); 235 } else if (of_device_is_compatible(stdout_node, "hvterm-protocol")) { 236 vtermno = termno[0]; 237 udbg_putc = udbg_hvsi_putc; 238 udbg_getc = udbg_hvsi_getc; 239 udbg_getc_poll = udbg_hvsi_getc_poll; 240 add_preferred_console("hvsi", termno[0] & 0xff, NULL); 241 } 242 out: 243 of_node_put(stdout_node); 244 } 245 246 void vpa_init(int cpu) 247 { 248 int hwcpu = get_hard_smp_processor_id(cpu); 249 unsigned long addr; 250 long ret; 251 struct paca_struct *pp; 252 struct dtl_entry *dtl; 253 254 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 255 lppaca_of(cpu).vmxregs_in_use = 1; 256 257 addr = __pa(&lppaca_of(cpu)); 258 ret = register_vpa(hwcpu, addr); 259 260 if (ret) { 261 printk(KERN_ERR "WARNING: vpa_init: VPA registration for " 262 "cpu %d (hw %d) of area %lx returns %ld\n", 263 cpu, hwcpu, addr, ret); 264 return; 265 } 266 /* 267 * PAPR says this feature is SLB-Buffer but firmware never 268 * reports that. All SPLPAR support SLB shadow buffer. 269 */ 270 addr = __pa(&slb_shadow[cpu]); 271 if (firmware_has_feature(FW_FEATURE_SPLPAR)) { 272 ret = register_slb_shadow(hwcpu, addr); 273 if (ret) 274 printk(KERN_ERR 275 "WARNING: vpa_init: SLB shadow buffer " 276 "registration for cpu %d (hw %d) of area %lx " 277 "returns %ld\n", cpu, hwcpu, addr, ret); 278 } 279 280 /* 281 * Register dispatch trace log, if one has been allocated. 282 */ 283 pp = &paca[cpu]; 284 dtl = pp->dispatch_log; 285 if (dtl) { 286 pp->dtl_ridx = 0; 287 pp->dtl_curr = dtl; 288 lppaca_of(cpu).dtl_idx = 0; 289 290 /* hypervisor reads buffer length from this field */ 291 dtl->enqueue_to_dispatch_time = DISPATCH_LOG_BYTES; 292 ret = register_dtl(hwcpu, __pa(dtl)); 293 if (ret) 294 pr_warn("DTL registration failed for cpu %d (%ld)\n", 295 cpu, ret); 296 lppaca_of(cpu).dtl_enable_mask = 2; 297 } 298 } 299 300 static long pSeries_lpar_hpte_insert(unsigned long hpte_group, 301 unsigned long va, unsigned long pa, 302 unsigned long rflags, unsigned long vflags, 303 int psize, int ssize) 304 { 305 unsigned long lpar_rc; 306 unsigned long flags; 307 unsigned long slot; 308 unsigned long hpte_v, hpte_r; 309 310 if (!(vflags & HPTE_V_BOLTED)) 311 pr_devel("hpte_insert(group=%lx, va=%016lx, pa=%016lx, " 312 "rflags=%lx, vflags=%lx, psize=%d)\n", 313 hpte_group, va, pa, rflags, vflags, psize); 314 315 hpte_v = hpte_encode_v(va, psize, ssize) | vflags | HPTE_V_VALID; 316 hpte_r = hpte_encode_r(pa, psize) | rflags; 317 318 if (!(vflags & HPTE_V_BOLTED)) 319 pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r); 320 321 /* Now fill in the actual HPTE */ 322 /* Set CEC cookie to 0 */ 323 /* Zero page = 0 */ 324 /* I-cache Invalidate = 0 */ 325 /* I-cache synchronize = 0 */ 326 /* Exact = 0 */ 327 flags = 0; 328 329 /* Make pHyp happy */ 330 if ((rflags & _PAGE_NO_CACHE) & !(rflags & _PAGE_WRITETHRU)) 331 hpte_r &= ~_PAGE_COHERENT; 332 333 lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot); 334 if (unlikely(lpar_rc == H_PTEG_FULL)) { 335 if (!(vflags & HPTE_V_BOLTED)) 336 pr_devel(" full\n"); 337 return -1; 338 } 339 340 /* 341 * Since we try and ioremap PHBs we don't own, the pte insert 342 * will fail. However we must catch the failure in hash_page 343 * or we will loop forever, so return -2 in this case. 344 */ 345 if (unlikely(lpar_rc != H_SUCCESS)) { 346 if (!(vflags & HPTE_V_BOLTED)) 347 pr_devel(" lpar err %lu\n", lpar_rc); 348 return -2; 349 } 350 if (!(vflags & HPTE_V_BOLTED)) 351 pr_devel(" -> slot: %lu\n", slot & 7); 352 353 /* Because of iSeries, we have to pass down the secondary 354 * bucket bit here as well 355 */ 356 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3); 357 } 358 359 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock); 360 361 static long pSeries_lpar_hpte_remove(unsigned long hpte_group) 362 { 363 unsigned long slot_offset; 364 unsigned long lpar_rc; 365 int i; 366 unsigned long dummy1, dummy2; 367 368 /* pick a random slot to start at */ 369 slot_offset = mftb() & 0x7; 370 371 for (i = 0; i < HPTES_PER_GROUP; i++) { 372 373 /* don't remove a bolted entry */ 374 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset, 375 (0x1UL << 4), &dummy1, &dummy2); 376 if (lpar_rc == H_SUCCESS) 377 return i; 378 BUG_ON(lpar_rc != H_NOT_FOUND); 379 380 slot_offset++; 381 slot_offset &= 0x7; 382 } 383 384 return -1; 385 } 386 387 static void pSeries_lpar_hptab_clear(void) 388 { 389 unsigned long size_bytes = 1UL << ppc64_pft_size; 390 unsigned long hpte_count = size_bytes >> 4; 391 struct { 392 unsigned long pteh; 393 unsigned long ptel; 394 } ptes[4]; 395 long lpar_rc; 396 int i, j; 397 398 /* Read in batches of 4, 399 * invalidate only valid entries not in the VRMA 400 * hpte_count will be a multiple of 4 401 */ 402 for (i = 0; i < hpte_count; i += 4) { 403 lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes); 404 if (lpar_rc != H_SUCCESS) 405 continue; 406 for (j = 0; j < 4; j++){ 407 if ((ptes[j].pteh & HPTE_V_VRMA_MASK) == 408 HPTE_V_VRMA_MASK) 409 continue; 410 if (ptes[j].pteh & HPTE_V_VALID) 411 plpar_pte_remove_raw(0, i + j, 0, 412 &(ptes[j].pteh), &(ptes[j].ptel)); 413 } 414 } 415 } 416 417 /* 418 * This computes the AVPN and B fields of the first dword of a HPTE, 419 * for use when we want to match an existing PTE. The bottom 7 bits 420 * of the returned value are zero. 421 */ 422 static inline unsigned long hpte_encode_avpn(unsigned long va, int psize, 423 int ssize) 424 { 425 unsigned long v; 426 427 v = (va >> 23) & ~(mmu_psize_defs[psize].avpnm); 428 v <<= HPTE_V_AVPN_SHIFT; 429 v |= ((unsigned long) ssize) << HPTE_V_SSIZE_SHIFT; 430 return v; 431 } 432 433 /* 434 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and 435 * the low 3 bits of flags happen to line up. So no transform is needed. 436 * We can probably optimize here and assume the high bits of newpp are 437 * already zero. For now I am paranoid. 438 */ 439 static long pSeries_lpar_hpte_updatepp(unsigned long slot, 440 unsigned long newpp, 441 unsigned long va, 442 int psize, int ssize, int local) 443 { 444 unsigned long lpar_rc; 445 unsigned long flags = (newpp & 7) | H_AVPN; 446 unsigned long want_v; 447 448 want_v = hpte_encode_avpn(va, psize, ssize); 449 450 pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...", 451 want_v, slot, flags, psize); 452 453 lpar_rc = plpar_pte_protect(flags, slot, want_v); 454 455 if (lpar_rc == H_NOT_FOUND) { 456 pr_devel("not found !\n"); 457 return -1; 458 } 459 460 pr_devel("ok\n"); 461 462 BUG_ON(lpar_rc != H_SUCCESS); 463 464 return 0; 465 } 466 467 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot) 468 { 469 unsigned long dword0; 470 unsigned long lpar_rc; 471 unsigned long dummy_word1; 472 unsigned long flags; 473 474 /* Read 1 pte at a time */ 475 /* Do not need RPN to logical page translation */ 476 /* No cross CEC PFT access */ 477 flags = 0; 478 479 lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1); 480 481 BUG_ON(lpar_rc != H_SUCCESS); 482 483 return dword0; 484 } 485 486 static long pSeries_lpar_hpte_find(unsigned long va, int psize, int ssize) 487 { 488 unsigned long hash; 489 unsigned long i; 490 long slot; 491 unsigned long want_v, hpte_v; 492 493 hash = hpt_hash(va, mmu_psize_defs[psize].shift, ssize); 494 want_v = hpte_encode_avpn(va, psize, ssize); 495 496 /* Bolted entries are always in the primary group */ 497 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 498 for (i = 0; i < HPTES_PER_GROUP; i++) { 499 hpte_v = pSeries_lpar_hpte_getword0(slot); 500 501 if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID)) 502 /* HPTE matches */ 503 return slot; 504 ++slot; 505 } 506 507 return -1; 508 } 509 510 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp, 511 unsigned long ea, 512 int psize, int ssize) 513 { 514 unsigned long lpar_rc, slot, vsid, va, flags; 515 516 vsid = get_kernel_vsid(ea, ssize); 517 va = hpt_va(ea, vsid, ssize); 518 519 slot = pSeries_lpar_hpte_find(va, psize, ssize); 520 BUG_ON(slot == -1); 521 522 flags = newpp & 7; 523 lpar_rc = plpar_pte_protect(flags, slot, 0); 524 525 BUG_ON(lpar_rc != H_SUCCESS); 526 } 527 528 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va, 529 int psize, int ssize, int local) 530 { 531 unsigned long want_v; 532 unsigned long lpar_rc; 533 unsigned long dummy1, dummy2; 534 535 pr_devel(" inval : slot=%lx, va=%016lx, psize: %d, local: %d\n", 536 slot, va, psize, local); 537 538 want_v = hpte_encode_avpn(va, psize, ssize); 539 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2); 540 if (lpar_rc == H_NOT_FOUND) 541 return; 542 543 BUG_ON(lpar_rc != H_SUCCESS); 544 } 545 546 static void pSeries_lpar_hpte_removebolted(unsigned long ea, 547 int psize, int ssize) 548 { 549 unsigned long slot, vsid, va; 550 551 vsid = get_kernel_vsid(ea, ssize); 552 va = hpt_va(ea, vsid, ssize); 553 554 slot = pSeries_lpar_hpte_find(va, psize, ssize); 555 BUG_ON(slot == -1); 556 557 pSeries_lpar_hpte_invalidate(slot, va, psize, ssize, 0); 558 } 559 560 /* Flag bits for H_BULK_REMOVE */ 561 #define HBR_REQUEST 0x4000000000000000UL 562 #define HBR_RESPONSE 0x8000000000000000UL 563 #define HBR_END 0xc000000000000000UL 564 #define HBR_AVPN 0x0200000000000000UL 565 #define HBR_ANDCOND 0x0100000000000000UL 566 567 /* 568 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie 569 * lock. 570 */ 571 static void pSeries_lpar_flush_hash_range(unsigned long number, int local) 572 { 573 unsigned long i, pix, rc; 574 unsigned long flags = 0; 575 struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch); 576 int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE); 577 unsigned long param[9]; 578 unsigned long va; 579 unsigned long hash, index, shift, hidx, slot; 580 real_pte_t pte; 581 int psize, ssize; 582 583 if (lock_tlbie) 584 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 585 586 psize = batch->psize; 587 ssize = batch->ssize; 588 pix = 0; 589 for (i = 0; i < number; i++) { 590 va = batch->vaddr[i]; 591 pte = batch->pte[i]; 592 pte_iterate_hashed_subpages(pte, psize, va, index, shift) { 593 hash = hpt_hash(va, shift, ssize); 594 hidx = __rpte_to_hidx(pte, index); 595 if (hidx & _PTEIDX_SECONDARY) 596 hash = ~hash; 597 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 598 slot += hidx & _PTEIDX_GROUP_IX; 599 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 600 pSeries_lpar_hpte_invalidate(slot, va, psize, 601 ssize, local); 602 } else { 603 param[pix] = HBR_REQUEST | HBR_AVPN | slot; 604 param[pix+1] = hpte_encode_avpn(va, psize, 605 ssize); 606 pix += 2; 607 if (pix == 8) { 608 rc = plpar_hcall9(H_BULK_REMOVE, param, 609 param[0], param[1], param[2], 610 param[3], param[4], param[5], 611 param[6], param[7]); 612 BUG_ON(rc != H_SUCCESS); 613 pix = 0; 614 } 615 } 616 } pte_iterate_hashed_end(); 617 } 618 if (pix) { 619 param[pix] = HBR_END; 620 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], 621 param[2], param[3], param[4], param[5], 622 param[6], param[7]); 623 BUG_ON(rc != H_SUCCESS); 624 } 625 626 if (lock_tlbie) 627 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 628 } 629 630 static int __init disable_bulk_remove(char *str) 631 { 632 if (strcmp(str, "off") == 0 && 633 firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 634 printk(KERN_INFO "Disabling BULK_REMOVE firmware feature"); 635 powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE; 636 } 637 return 1; 638 } 639 640 __setup("bulk_remove=", disable_bulk_remove); 641 642 void __init hpte_init_lpar(void) 643 { 644 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate; 645 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp; 646 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp; 647 ppc_md.hpte_insert = pSeries_lpar_hpte_insert; 648 ppc_md.hpte_remove = pSeries_lpar_hpte_remove; 649 ppc_md.hpte_removebolted = pSeries_lpar_hpte_removebolted; 650 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range; 651 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear; 652 } 653 654 #ifdef CONFIG_PPC_SMLPAR 655 #define CMO_FREE_HINT_DEFAULT 1 656 static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT; 657 658 static int __init cmo_free_hint(char *str) 659 { 660 char *parm; 661 parm = strstrip(str); 662 663 if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) { 664 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n"); 665 cmo_free_hint_flag = 0; 666 return 1; 667 } 668 669 cmo_free_hint_flag = 1; 670 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n"); 671 672 if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0) 673 return 1; 674 675 return 0; 676 } 677 678 __setup("cmo_free_hint=", cmo_free_hint); 679 680 static void pSeries_set_page_state(struct page *page, int order, 681 unsigned long state) 682 { 683 int i, j; 684 unsigned long cmo_page_sz, addr; 685 686 cmo_page_sz = cmo_get_page_size(); 687 addr = __pa((unsigned long)page_address(page)); 688 689 for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) { 690 for (j = 0; j < PAGE_SIZE; j += cmo_page_sz) 691 plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0); 692 } 693 } 694 695 void arch_free_page(struct page *page, int order) 696 { 697 if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO)) 698 return; 699 700 pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED); 701 } 702 EXPORT_SYMBOL(arch_free_page); 703 704 #endif 705 706 #ifdef CONFIG_TRACEPOINTS 707 /* 708 * We optimise our hcall path by placing hcall_tracepoint_refcount 709 * directly in the TOC so we can check if the hcall tracepoints are 710 * enabled via a single load. 711 */ 712 713 /* NB: reg/unreg are called while guarded with the tracepoints_mutex */ 714 extern long hcall_tracepoint_refcount; 715 716 void hcall_tracepoint_regfunc(void) 717 { 718 hcall_tracepoint_refcount++; 719 } 720 721 void hcall_tracepoint_unregfunc(void) 722 { 723 hcall_tracepoint_refcount--; 724 } 725 726 void __trace_hcall_entry(unsigned long opcode, unsigned long *args) 727 { 728 trace_hcall_entry(opcode, args); 729 } 730 731 void __trace_hcall_exit(long opcode, unsigned long retval, 732 unsigned long *retbuf) 733 { 734 trace_hcall_exit(opcode, retval, retbuf); 735 } 736 #endif 737