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         unsigned long dummy1, dummy2, dword0;
 371         long lpar_rc;
 372         int i;
 373
 374         /* TODO: Use bulk call */
 375         for (i = 0; i < hpte_count; i++) {
 376                 /* dont remove HPTEs with VRMA mappings */
 377                 lpar_rc = plpar_pte_remove_raw(H_ANDCOND, i, HPTE_V_1TB_SEG,
 378                                                 &dummy1, &dummy2);
 379                 if (lpar_rc == H_NOT_FOUND) {
 380                         lpar_rc = plpar_pte_read_raw(0, i, &dword0, &dummy1);
 381                         if (!lpar_rc && ((dword0 & HPTE_V_VRMA_MASK)
 382                                 != HPTE_V_VRMA_MASK))
 383                                 /* Can be hpte for 1TB Seg. So remove it */
 384                                 plpar_pte_remove_raw(0, i, 0, &dummy1, &dummy2);
 385                 }
 386         }
 387 }
 388
 389 /*
 390  * This computes the AVPN and B fields of the first dword of a HPTE,
 391  * for use when we want to match an existing PTE.  The bottom 7 bits
 392  * of the returned value are zero.
 393  */
 394 static inline unsigned long hpte_encode_avpn(unsigned long va, int psize,
 395                                              int ssize)
 396 {
 397         unsigned long v;
 398
 399         v = (va >> 23) & ~(mmu_psize_defs[psize].avpnm);
 400         v <<= HPTE_V_AVPN_SHIFT;
 401         v |= ((unsigned long) ssize) << HPTE_V_SSIZE_SHIFT;
 402         return v;
 403 }
 404
 405 /*
 406  * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
 407  * the low 3 bits of flags happen to line up.  So no transform is needed.
 408  * We can probably optimize here and assume the high bits of newpp are
 409  * already zero.  For now I am paranoid.
 410  */
 411 static long pSeries_lpar_hpte_updatepp(unsigned long slot,
 412                                        unsigned long newpp,
 413                                        unsigned long va,
 414                                        int psize, int ssize, int local)
 415 {
 416         unsigned long lpar_rc;
 417         unsigned long flags = (newpp & 7) | H_AVPN;
 418         unsigned long want_v;
 419
 420         want_v = hpte_encode_avpn(va, psize, ssize);
 421
 422         pr_devel("    update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...",
 423                  want_v, slot, flags, psize);
 424
 425         lpar_rc = plpar_pte_protect(flags, slot, want_v);
 426
 427         if (lpar_rc == H_NOT_FOUND) {
 428                 pr_devel("not found !\n");
 429                 return -1;
 430         }
 431
 432         pr_devel("ok\n");
 433
 434         BUG_ON(lpar_rc != H_SUCCESS);
 435
 436         return 0;
 437 }
 438
 439 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
 440 {
 441         unsigned long dword0;
 442         unsigned long lpar_rc;
 443         unsigned long dummy_word1;
 444         unsigned long flags;
 445
 446         /* Read 1 pte at a time                        */
 447         /* Do not need RPN to logical page translation */
 448         /* No cross CEC PFT access                     */
 449         flags = 0;
 450
 451         lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
 452
 453         BUG_ON(lpar_rc != H_SUCCESS);
 454
 455         return dword0;
 456 }
 457
 458 static long pSeries_lpar_hpte_find(unsigned long va, int psize, int ssize)
 459 {
 460         unsigned long hash;
 461         unsigned long i;
 462         long slot;
 463         unsigned long want_v, hpte_v;
 464
 465         hash = hpt_hash(va, mmu_psize_defs[psize].shift, ssize);
 466         want_v = hpte_encode_avpn(va, psize, ssize);
 467
 468         /* Bolted entries are always in the primary group */
 469         slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
 470         for (i = 0; i < HPTES_PER_GROUP; i++) {
 471                 hpte_v = pSeries_lpar_hpte_getword0(slot);
 472
 473                 if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID))
 474                         /* HPTE matches */
 475                         return slot;
 476                 ++slot;
 477         }
 478
 479         return -1;
 480 }
 481
 482 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
 483                                              unsigned long ea,
 484                                              int psize, int ssize)
 485 {
 486         unsigned long lpar_rc, slot, vsid, va, flags;
 487
 488         vsid = get_kernel_vsid(ea, ssize);
 489         va = hpt_va(ea, vsid, ssize);
 490
 491         slot = pSeries_lpar_hpte_find(va, psize, ssize);
 492         BUG_ON(slot == -1);
 493
 494         flags = newpp & 7;
 495         lpar_rc = plpar_pte_protect(flags, slot, 0);
 496
 497         BUG_ON(lpar_rc != H_SUCCESS);
 498 }
 499
 500 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
 501                                          int psize, int ssize, int local)
 502 {
 503         unsigned long want_v;
 504         unsigned long lpar_rc;
 505         unsigned long dummy1, dummy2;
 506
 507         pr_devel("    inval : slot=%lx, va=%016lx, psize: %d, local: %d\n",
 508                  slot, va, psize, local);
 509
 510         want_v = hpte_encode_avpn(va, psize, ssize);
 511         lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2);
 512         if (lpar_rc == H_NOT_FOUND)
 513                 return;
 514
 515         BUG_ON(lpar_rc != H_SUCCESS);
 516 }
 517
 518 static void pSeries_lpar_hpte_removebolted(unsigned long ea,
 519                                            int psize, int ssize)
 520 {
 521         unsigned long slot, vsid, va;
 522
 523         vsid = get_kernel_vsid(ea, ssize);
 524         va = hpt_va(ea, vsid, ssize);
 525
 526         slot = pSeries_lpar_hpte_find(va, psize, ssize);
 527         BUG_ON(slot == -1);
 528
 529         pSeries_lpar_hpte_invalidate(slot, va, psize, ssize, 0);
 530 }
 531
 532 /* Flag bits for H_BULK_REMOVE */
 533 #define HBR_REQUEST     0x4000000000000000UL
 534 #define HBR_RESPONSE    0x8000000000000000UL
 535 #define HBR_END         0xc000000000000000UL
 536 #define HBR_AVPN        0x0200000000000000UL
 537 #define HBR_ANDCOND     0x0100000000000000UL
 538
 539 /*
 540  * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
 541  * lock.
 542  */
 543 static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
 544 {
 545         unsigned long i, pix, rc;
 546         unsigned long flags = 0;
 547         struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
 548         int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE);
 549         unsigned long param[9];
 550         unsigned long va;
 551         unsigned long hash, index, shift, hidx, slot;
 552         real_pte_t pte;
 553         int psize, ssize;
 554
 555         if (lock_tlbie)
 556                 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
 557
 558         psize = batch->psize;
 559         ssize = batch->ssize;
 560         pix = 0;
 561         for (i = 0; i < number; i++) {
 562                 va = batch->vaddr[i];
 563                 pte = batch->pte[i];
 564                 pte_iterate_hashed_subpages(pte, psize, va, index, shift) {
 565                         hash = hpt_hash(va, shift, ssize);
 566                         hidx = __rpte_to_hidx(pte, index);
 567                         if (hidx & _PTEIDX_SECONDARY)
 568                                 hash = ~hash;
 569                         slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
 570                         slot += hidx & _PTEIDX_GROUP_IX;
 571                         if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
 572                                 pSeries_lpar_hpte_invalidate(slot, va, psize,
 573                                                              ssize, local);
 574                         } else {
 575                                 param[pix] = HBR_REQUEST | HBR_AVPN | slot;
 576                                 param[pix+1] = hpte_encode_avpn(va, psize,
 577                                                                 ssize);
 578                                 pix += 2;
 579                                 if (pix == 8) {
 580                                         rc = plpar_hcall9(H_BULK_REMOVE, param,
 581                                                 param[0], param[1], param[2],
 582                                                 param[3], param[4], param[5],
 583                                                 param[6], param[7]);
 584                                         BUG_ON(rc != H_SUCCESS);
 585                                         pix = 0;
 586                                 }
 587                         }
 588                 } pte_iterate_hashed_end();
 589         }
 590         if (pix) {
 591                 param[pix] = HBR_END;
 592                 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
 593                                   param[2], param[3], param[4], param[5],
 594                                   param[6], param[7]);
 595                 BUG_ON(rc != H_SUCCESS);
 596         }
 597
 598         if (lock_tlbie)
 599                 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
 600 }
 601
 602 void __init hpte_init_lpar(void)
 603 {
 604         ppc_md.hpte_invalidate  = pSeries_lpar_hpte_invalidate;
 605         ppc_md.hpte_updatepp    = pSeries_lpar_hpte_updatepp;
 606         ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
 607         ppc_md.hpte_insert      = pSeries_lpar_hpte_insert;
 608         ppc_md.hpte_remove      = pSeries_lpar_hpte_remove;
 609         ppc_md.hpte_removebolted = pSeries_lpar_hpte_removebolted;
 610         ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
 611         ppc_md.hpte_clear_all   = pSeries_lpar_hptab_clear;
 612 }
 613
 614 #ifdef CONFIG_PPC_SMLPAR
 615 #define CMO_FREE_HINT_DEFAULT 1
 616 static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT;
 617
 618 static int __init cmo_free_hint(char *str)
 619 {
 620         char *parm;
 621         parm = strstrip(str);
 622
 623         if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) {
 624                 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n");
 625                 cmo_free_hint_flag = 0;
 626                 return 1;
 627         }
 628
 629         cmo_free_hint_flag = 1;
 630         printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n");
 631
 632         if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0)
 633                 return 1;
 634
 635         return 0;
 636 }
 637
 638 __setup("cmo_free_hint=", cmo_free_hint);
 639
 640 static void pSeries_set_page_state(struct page *page, int order,
 641                                    unsigned long state)
 642 {
 643         int i, j;
 644         unsigned long cmo_page_sz, addr;
 645
 646         cmo_page_sz = cmo_get_page_size();
 647         addr = __pa((unsigned long)page_address(page));
 648
 649         for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) {
 650                 for (j = 0; j < PAGE_SIZE; j += cmo_page_sz)
 651                         plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0);
 652         }
 653 }
 654
 655 void arch_free_page(struct page *page, int order)
 656 {
 657         if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO))
 658                 return;
 659
 660         pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED);
 661 }
 662 EXPORT_SYMBOL(arch_free_page);
 663
 664 #endif
 665
 666 #ifdef CONFIG_TRACEPOINTS
 667 /*
 668  * We optimise our hcall path by placing hcall_tracepoint_refcount
 669  * directly in the TOC so we can check if the hcall tracepoints are
 670  * enabled via a single load.
 671  */
 672
 673 /* NB: reg/unreg are called while guarded with the tracepoints_mutex */
 674 extern long hcall_tracepoint_refcount;
 675
 676 void hcall_tracepoint_regfunc(void)
 677 {
 678         hcall_tracepoint_refcount++;
 679 }
 680
 681 void hcall_tracepoint_unregfunc(void)
 682 {
 683         hcall_tracepoint_refcount--;
 684 }
 685
 686 void __trace_hcall_entry(unsigned long opcode, unsigned long *args)
 687 {
 688         trace_hcall_entry(opcode, args);
 689 }
 690
 691 void __trace_hcall_exit(long opcode, unsigned long retval,
 692                         unsigned long *retbuf)
 693 {
 694         trace_hcall_exit(opcode, retval, retbuf);
 695 }
 696 #endif