arch/powerpc/platforms/pseries/lpar.c

   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 /*
 717  * Since the tracing code might execute hcalls we need to guard against
 718  * recursion. One example of this are spinlocks calling H_YIELD on
 719  * shared processor partitions.
 720  */
 721 static DEFINE_PER_CPU(unsigned int, hcall_trace_depth);
 722
 723 void hcall_tracepoint_regfunc(void)
 724 {
 725         hcall_tracepoint_refcount++;
 726 }
 727
 728 void hcall_tracepoint_unregfunc(void)
 729 {
 730         hcall_tracepoint_refcount--;
 731 }
 732
 733 void __trace_hcall_entry(unsigned long opcode, unsigned long *args)
 734 {
 735         unsigned long flags;
 736         unsigned int *depth;
 737
 738         local_irq_save(flags);
 739
 740         depth = &__get_cpu_var(hcall_trace_depth);
 741
 742         if (*depth)
 743                 goto out;
 744
 745         (*depth)++;
 746         trace_hcall_entry(opcode, args);
 747         (*depth)--;
 748
 749 out:
 750         local_irq_restore(flags);
 751 }
 752
 753 void __trace_hcall_exit(long opcode, unsigned long retval,
 754                         unsigned long *retbuf)
 755 {
 756         unsigned long flags;
 757         unsigned int *depth;
 758
 759         local_irq_save(flags);
 760
 761         depth = &__get_cpu_var(hcall_trace_depth);
 762
 763         if (*depth)
 764                 goto out;
 765
 766         (*depth)++;
 767         trace_hcall_exit(opcode, retval, retbuf);
 768         (*depth)--;
 769
 770 out:
 771         local_irq_restore(flags);
 772 }
 773 #endif