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 */ 49EXPORT_SYMBOL(plpar_hcall); 50EXPORT_SYMBOL(plpar_hcall9); 51EXPORT_SYMBOL(plpar_hcall_norets); 52 53extern void pSeries_find_serial_port(void); 54 55 56static int vtermno; /* virtual terminal# for udbg */ 57 58#define __ALIGNED__ __attribute__((__aligned__(sizeof(long)))) 59static 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 73static long hvsi_udbg_buf_len; 74static uint8_t hvsi_udbg_buf[256]; 75 76static 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 110static 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 126static 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 */ 141static long inbuflen; 142static long inbuf[2]; /* must be 2 longs */ 143 144static 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 171static 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 */ 190void __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 */ 201void __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 } 242out: 243 of_node_put(stdout_node); 244} 245 246void vpa_init(int cpu) 247{ 248 int hwcpu = get_hard_smp_processor_id(cpu); 249 unsigned long addr; 250 long ret; 251 252 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 253 lppaca[cpu].vmxregs_in_use = 1; 254 255 addr = __pa(&lppaca[cpu]); 256 ret = register_vpa(hwcpu, addr); 257 258 if (ret) { 259 printk(KERN_ERR "WARNING: vpa_init: VPA registration for " 260 "cpu %d (hw %d) of area %lx returns %ld\n", 261 cpu, hwcpu, addr, ret); 262 return; 263 } 264 /* 265 * PAPR says this feature is SLB-Buffer but firmware never 266 * reports that. All SPLPAR support SLB shadow buffer. 267 */ 268 addr = __pa(&slb_shadow[cpu]); 269 if (firmware_has_feature(FW_FEATURE_SPLPAR)) { 270 ret = register_slb_shadow(hwcpu, addr); 271 if (ret) 272 printk(KERN_ERR 273 "WARNING: vpa_init: SLB shadow buffer " 274 "registration for cpu %d (hw %d) of area %lx " 275 "returns %ld\n", cpu, hwcpu, addr, ret); 276 } 277} 278 279static long pSeries_lpar_hpte_insert(unsigned long hpte_group, 280 unsigned long va, unsigned long pa, 281 unsigned long rflags, unsigned long vflags, 282 int psize, int ssize) 283{ 284 unsigned long lpar_rc; 285 unsigned long flags; 286 unsigned long slot; 287 unsigned long hpte_v, hpte_r; 288 289 if (!(vflags & HPTE_V_BOLTED)) 290 pr_devel("hpte_insert(group=%lx, va=%016lx, pa=%016lx, " 291 "rflags=%lx, vflags=%lx, psize=%d)\n", 292 hpte_group, va, pa, rflags, vflags, psize); 293 294 hpte_v = hpte_encode_v(va, psize, ssize) | vflags | HPTE_V_VALID; 295 hpte_r = hpte_encode_r(pa, psize) | rflags; 296 297 if (!(vflags & HPTE_V_BOLTED)) 298 pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r); 299 300 /* Now fill in the actual HPTE */ 301 /* Set CEC cookie to 0 */ 302 /* Zero page = 0 */ 303 /* I-cache Invalidate = 0 */ 304 /* I-cache synchronize = 0 */ 305 /* Exact = 0 */ 306 flags = 0; 307 308 /* Make pHyp happy */ 309 if ((rflags & _PAGE_NO_CACHE) & !(rflags & _PAGE_WRITETHRU)) 310 hpte_r &= ~_PAGE_COHERENT; 311 312 lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot); 313 if (unlikely(lpar_rc == H_PTEG_FULL)) { 314 if (!(vflags & HPTE_V_BOLTED)) 315 pr_devel(" full\n"); 316 return -1; 317 } 318 319 /* 320 * Since we try and ioremap PHBs we don't own, the pte insert 321 * will fail. However we must catch the failure in hash_page 322 * or we will loop forever, so return -2 in this case. 323 */ 324 if (unlikely(lpar_rc != H_SUCCESS)) { 325 if (!(vflags & HPTE_V_BOLTED)) 326 pr_devel(" lpar err %lu\n", lpar_rc); 327 return -2; 328 } 329 if (!(vflags & HPTE_V_BOLTED)) 330 pr_devel(" -> slot: %lu\n", slot & 7); 331 332 /* Because of iSeries, we have to pass down the secondary 333 * bucket bit here as well 334 */ 335 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3); 336} 337 338static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock); 339 340static long pSeries_lpar_hpte_remove(unsigned long hpte_group) 341{ 342 unsigned long slot_offset; 343 unsigned long lpar_rc; 344 int i; 345 unsigned long dummy1, dummy2; 346 347 /* pick a random slot to start at */ 348 slot_offset = mftb() & 0x7; 349 350 for (i = 0; i < HPTES_PER_GROUP; i++) { 351 352 /* don't remove a bolted entry */ 353 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset, 354 (0x1UL << 4), &dummy1, &dummy2); 355 if (lpar_rc == H_SUCCESS) 356 return i; 357 BUG_ON(lpar_rc != H_NOT_FOUND); 358 359 slot_offset++; 360 slot_offset &= 0x7; 361 } 362 363 return -1; 364} 365 366static void pSeries_lpar_hptab_clear(void) 367{ 368 unsigned long size_bytes = 1UL << ppc64_pft_size; 369 unsigned long hpte_count = size_bytes >> 4; 370 struct { 371 unsigned long pteh; 372 unsigned long ptel; 373 } ptes[4]; 374 long lpar_rc; 375 int i, j; 376 377 /* Read in batches of 4, 378 * invalidate only valid entries not in the VRMA 379 * hpte_count will be a multiple of 4 380 */ 381 for (i = 0; i < hpte_count; i += 4) { 382 lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes); 383 if (lpar_rc != H_SUCCESS) 384 continue; 385 for (j = 0; j < 4; j++){ 386 if ((ptes[j].pteh & HPTE_V_VRMA_MASK) == 387 HPTE_V_VRMA_MASK) 388 continue; 389 if (ptes[j].pteh & HPTE_V_VALID) 390 plpar_pte_remove_raw(0, i + j, 0, 391 &(ptes[j].pteh), &(ptes[j].ptel)); 392 } 393 } 394} 395 396/* 397 * This computes the AVPN and B fields of the first dword of a HPTE, 398 * for use when we want to match an existing PTE. The bottom 7 bits 399 * of the returned value are zero. 400 */ 401static inline unsigned long hpte_encode_avpn(unsigned long va, int psize, 402 int ssize) 403{ 404 unsigned long v; 405 406 v = (va >> 23) & ~(mmu_psize_defs[psize].avpnm); 407 v <<= HPTE_V_AVPN_SHIFT; 408 v |= ((unsigned long) ssize) << HPTE_V_SSIZE_SHIFT; 409 return v; 410} 411 412/* 413 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and 414 * the low 3 bits of flags happen to line up. So no transform is needed. 415 * We can probably optimize here and assume the high bits of newpp are 416 * already zero. For now I am paranoid. 417 */ 418static long pSeries_lpar_hpte_updatepp(unsigned long slot, 419 unsigned long newpp, 420 unsigned long va, 421 int psize, int ssize, int local) 422{ 423 unsigned long lpar_rc; 424 unsigned long flags = (newpp & 7) | H_AVPN; 425 unsigned long want_v; 426 427 want_v = hpte_encode_avpn(va, psize, ssize); 428 429 pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...", 430 want_v, slot, flags, psize); 431 432 lpar_rc = plpar_pte_protect(flags, slot, want_v); 433 434 if (lpar_rc == H_NOT_FOUND) { 435 pr_devel("not found !\n"); 436 return -1; 437 } 438 439 pr_devel("ok\n"); 440 441 BUG_ON(lpar_rc != H_SUCCESS); 442 443 return 0; 444} 445 446static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot) 447{ 448 unsigned long dword0; 449 unsigned long lpar_rc; 450 unsigned long dummy_word1; 451 unsigned long flags; 452 453 /* Read 1 pte at a time */ 454 /* Do not need RPN to logical page translation */ 455 /* No cross CEC PFT access */ 456 flags = 0; 457 458 lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1); 459 460 BUG_ON(lpar_rc != H_SUCCESS); 461 462 return dword0; 463} 464 465static long pSeries_lpar_hpte_find(unsigned long va, int psize, int ssize) 466{ 467 unsigned long hash; 468 unsigned long i; 469 long slot; 470 unsigned long want_v, hpte_v; 471 472 hash = hpt_hash(va, mmu_psize_defs[psize].shift, ssize); 473 want_v = hpte_encode_avpn(va, psize, ssize); 474 475 /* Bolted entries are always in the primary group */ 476 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 477 for (i = 0; i < HPTES_PER_GROUP; i++) { 478 hpte_v = pSeries_lpar_hpte_getword0(slot); 479 480 if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID)) 481 /* HPTE matches */ 482 return slot; 483 ++slot; 484 } 485 486 return -1; 487} 488 489static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp, 490 unsigned long ea, 491 int psize, int ssize) 492{ 493 unsigned long lpar_rc, slot, vsid, va, flags; 494 495 vsid = get_kernel_vsid(ea, ssize); 496 va = hpt_va(ea, vsid, ssize); 497 498 slot = pSeries_lpar_hpte_find(va, psize, ssize); 499 BUG_ON(slot == -1); 500 501 flags = newpp & 7; 502 lpar_rc = plpar_pte_protect(flags, slot, 0); 503 504 BUG_ON(lpar_rc != H_SUCCESS); 505} 506 507static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va, 508 int psize, int ssize, int local) 509{ 510 unsigned long want_v; 511 unsigned long lpar_rc; 512 unsigned long dummy1, dummy2; 513 514 pr_devel(" inval : slot=%lx, va=%016lx, psize: %d, local: %d\n", 515 slot, va, psize, local); 516 517 want_v = hpte_encode_avpn(va, psize, ssize); 518 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2); 519 if (lpar_rc == H_NOT_FOUND) 520 return; 521 522 BUG_ON(lpar_rc != H_SUCCESS); 523} 524 525static void pSeries_lpar_hpte_removebolted(unsigned long ea, 526 int psize, int ssize) 527{ 528 unsigned long slot, vsid, va; 529 530 vsid = get_kernel_vsid(ea, ssize); 531 va = hpt_va(ea, vsid, ssize); 532 533 slot = pSeries_lpar_hpte_find(va, psize, ssize); 534 BUG_ON(slot == -1); 535 536 pSeries_lpar_hpte_invalidate(slot, va, psize, ssize, 0); 537} 538 539/* Flag bits for H_BULK_REMOVE */ 540#define HBR_REQUEST 0x4000000000000000UL 541#define HBR_RESPONSE 0x8000000000000000UL 542#define HBR_END 0xc000000000000000UL 543#define HBR_AVPN 0x0200000000000000UL 544#define HBR_ANDCOND 0x0100000000000000UL 545 546/* 547 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie 548 * lock. 549 */ 550static void pSeries_lpar_flush_hash_range(unsigned long number, int local) 551{ 552 unsigned long i, pix, rc; 553 unsigned long flags = 0; 554 struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch); 555 int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE); 556 unsigned long param[9]; 557 unsigned long va; 558 unsigned long hash, index, shift, hidx, slot; 559 real_pte_t pte; 560 int psize, ssize; 561 562 if (lock_tlbie) 563 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 564 565 psize = batch->psize; 566 ssize = batch->ssize; 567 pix = 0; 568 for (i = 0; i < number; i++) { 569 va = batch->vaddr[i]; 570 pte = batch->pte[i]; 571 pte_iterate_hashed_subpages(pte, psize, va, index, shift) { 572 hash = hpt_hash(va, shift, ssize); 573 hidx = __rpte_to_hidx(pte, index); 574 if (hidx & _PTEIDX_SECONDARY) 575 hash = ~hash; 576 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 577 slot += hidx & _PTEIDX_GROUP_IX; 578 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 579 pSeries_lpar_hpte_invalidate(slot, va, psize, 580 ssize, local); 581 } else { 582 param[pix] = HBR_REQUEST | HBR_AVPN | slot; 583 param[pix+1] = hpte_encode_avpn(va, psize, 584 ssize); 585 pix += 2; 586 if (pix == 8) { 587 rc = plpar_hcall9(H_BULK_REMOVE, param, 588 param[0], param[1], param[2], 589 param[3], param[4], param[5], 590 param[6], param[7]); 591 BUG_ON(rc != H_SUCCESS); 592 pix = 0; 593 } 594 } 595 } pte_iterate_hashed_end(); 596 } 597 if (pix) { 598 param[pix] = HBR_END; 599 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], 600 param[2], param[3], param[4], param[5], 601 param[6], param[7]); 602 BUG_ON(rc != H_SUCCESS); 603 } 604 605 if (lock_tlbie) 606 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 607} 608 609void __init hpte_init_lpar(void) 610{ 611 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate; 612 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp; 613 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp; 614 ppc_md.hpte_insert = pSeries_lpar_hpte_insert; 615 ppc_md.hpte_remove = pSeries_lpar_hpte_remove; 616 ppc_md.hpte_removebolted = pSeries_lpar_hpte_removebolted; 617 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range; 618 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear; 619} 620 621#ifdef CONFIG_PPC_SMLPAR 622#define CMO_FREE_HINT_DEFAULT 1 623static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT; 624 625static int __init cmo_free_hint(char *str) 626{ 627 char *parm; 628 parm = strstrip(str); 629 630 if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) { 631 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n"); 632 cmo_free_hint_flag = 0; 633 return 1; 634 } 635 636 cmo_free_hint_flag = 1; 637 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n"); 638 639 if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0) 640 return 1; 641 642 return 0; 643} 644 645__setup("cmo_free_hint=", cmo_free_hint); 646 647static void pSeries_set_page_state(struct page *page, int order, 648 unsigned long state) 649{ 650 int i, j; 651 unsigned long cmo_page_sz, addr; 652 653 cmo_page_sz = cmo_get_page_size(); 654 addr = __pa((unsigned long)page_address(page)); 655 656 for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) { 657 for (j = 0; j < PAGE_SIZE; j += cmo_page_sz) 658 plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0); 659 } 660} 661 662void arch_free_page(struct page *page, int order) 663{ 664 if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO)) 665 return; 666 667 pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED); 668} 669EXPORT_SYMBOL(arch_free_page); 670 671#endif 672 673#ifdef CONFIG_TRACEPOINTS 674/* 675 * We optimise our hcall path by placing hcall_tracepoint_refcount 676 * directly in the TOC so we can check if the hcall tracepoints are 677 * enabled via a single load. 678 */ 679 680/* NB: reg/unreg are called while guarded with the tracepoints_mutex */ 681extern long hcall_tracepoint_refcount; 682 683/* 684 * Since the tracing code might execute hcalls we need to guard against 685 * recursion. One example of this are spinlocks calling H_YIELD on 686 * shared processor partitions. 687 */ 688static DEFINE_PER_CPU(unsigned int, hcall_trace_depth); 689 690void hcall_tracepoint_regfunc(void) 691{ 692 hcall_tracepoint_refcount++; 693} 694 695void hcall_tracepoint_unregfunc(void) 696{ 697 hcall_tracepoint_refcount--; 698} 699 700void __trace_hcall_entry(unsigned long opcode, unsigned long *args) 701{ 702 unsigned long flags; 703 unsigned int *depth; 704 705 local_irq_save(flags); 706 707 depth = &__get_cpu_var(hcall_trace_depth); 708 709 if (*depth) 710 goto out; 711 712 (*depth)++; 713 trace_hcall_entry(opcode, args); 714 (*depth)--; 715 716out: 717 local_irq_restore(flags); 718} 719 720void __trace_hcall_exit(long opcode, unsigned long retval, 721 unsigned long *retbuf) 722{ 723 unsigned long flags; 724 unsigned int *depth; 725 726 local_irq_save(flags); 727 728 depth = &__get_cpu_var(hcall_trace_depth); 729 730 if (*depth) 731 goto out; 732 733 (*depth)++; 734 trace_hcall_exit(opcode, retval, retbuf); 735 (*depth)--; 736 737out: 738 local_irq_restore(flags); 739} 740#endif 741