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
 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
 279 static 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
 338 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
 339
 340 static 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
 366 static 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  */
 401 static 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  */
 418 static 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
 446 static 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
 465 static 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
 489 static 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
 507 static 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
 525 static 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  */
 550 static 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
 609 void __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
 623 static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT;
 624
 625 static 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
 647 static 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
 662 void 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 }
 669 EXPORT_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 */
 681 extern long hcall_tracepoint_refcount;
 682
 683 void hcall_tracepoint_regfunc(void)
 684 {
 685         hcall_tracepoint_refcount++;
 686 }
 687
 688 void hcall_tracepoint_unregfunc(void)
 689 {
 690         hcall_tracepoint_refcount--;
 691 }
 692
 693 void __trace_hcall_entry(unsigned long opcode, unsigned long *args)
 694 {
 695         trace_hcall_entry(opcode, args);
 696 }
 697
 698 void __trace_hcall_exit(long opcode, unsigned long retval,
 699                         unsigned long *retbuf)
 700 {
 701         trace_hcall_exit(opcode, retval, retbuf);
 702 }
 703 #endif