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 #undef DEBUG_LOW
  23
  24 #include <linux/kernel.h>
  25 #include <linux/dma-mapping.h>
  26 #include <linux/console.h>
  27 #include <asm/processor.h>
  28 #include <asm/mmu.h>
  29 #include <asm/page.h>
  30 #include <asm/pgtable.h>
  31 #include <asm/machdep.h>
  32 #include <asm/abs_addr.h>
  33 #include <asm/mmu_context.h>
  34 #include <asm/iommu.h>
  35 #include <asm/tlbflush.h>
  36 #include <asm/tlb.h>
  37 #include <asm/prom.h>
  38 #include <asm/cputable.h>
  39 #include <asm/udbg.h>
  40 #include <asm/smp.h>
  41
  42 #include "plpar_wrappers.h"
  43
  44 #ifdef DEBUG_LOW
  45 #define DBG_LOW(fmt...) do { udbg_printf(fmt); } while(0)
  46 #else
  47 #define DBG_LOW(fmt...) do { } while(0)
  48 #endif
  49
  50 /* in hvCall.S */
  51 EXPORT_SYMBOL(plpar_hcall);
  52 EXPORT_SYMBOL(plpar_hcall9);
  53 EXPORT_SYMBOL(plpar_hcall_norets);
  54
  55 extern void pSeries_find_serial_port(void);
  56
  57
  58 int vtermno;    /* virtual terminal# for udbg  */
  59
  60 #define __ALIGNED__ __attribute__((__aligned__(sizeof(long))))
  61 static void udbg_hvsi_putc(char c)
  62 {
  63         /* packet's seqno isn't used anyways */
  64         uint8_t packet[] __ALIGNED__ = { 0xff, 5, 0, 0, c };
  65         int rc;
  66
  67         if (c == '\n')
  68                 udbg_hvsi_putc('\r');
  69
  70         do {
  71                 rc = plpar_put_term_char(vtermno, sizeof(packet), packet);
  72         } while (rc == H_BUSY);
  73 }
  74
  75 static long hvsi_udbg_buf_len;
  76 static uint8_t hvsi_udbg_buf[256];
  77
  78 static int udbg_hvsi_getc_poll(void)
  79 {
  80         unsigned char ch;
  81         int rc, i;
  82
  83         if (hvsi_udbg_buf_len == 0) {
  84                 rc = plpar_get_term_char(vtermno, &hvsi_udbg_buf_len, hvsi_udbg_buf);
  85                 if (rc != H_SUCCESS || hvsi_udbg_buf[0] != 0xff) {
  86                         /* bad read or non-data packet */
  87                         hvsi_udbg_buf_len = 0;
  88                 } else {
  89                         /* remove the packet header */
  90                         for (i = 4; i < hvsi_udbg_buf_len; i++)
  91                                 hvsi_udbg_buf[i-4] = hvsi_udbg_buf[i];
  92                         hvsi_udbg_buf_len -= 4;
  93                 }
  94         }
  95
  96         if (hvsi_udbg_buf_len <= 0 || hvsi_udbg_buf_len > 256) {
  97                 /* no data ready */
  98                 hvsi_udbg_buf_len = 0;
  99                 return -1;
 100         }
 101
 102         ch = hvsi_udbg_buf[0];
 103         /* shift remaining data down */
 104         for (i = 1; i < hvsi_udbg_buf_len; i++) {
 105                 hvsi_udbg_buf[i-1] = hvsi_udbg_buf[i];
 106         }
 107         hvsi_udbg_buf_len--;
 108
 109         return ch;
 110 }
 111
 112 static int udbg_hvsi_getc(void)
 113 {
 114         int ch;
 115         for (;;) {
 116                 ch = udbg_hvsi_getc_poll();
 117                 if (ch == -1) {
 118                         /* This shouldn't be needed...but... */
 119                         volatile unsigned long delay;
 120                         for (delay=0; delay < 2000000; delay++)
 121                                 ;
 122                 } else {
 123                         return ch;
 124                 }
 125         }
 126 }
 127
 128 static void udbg_putcLP(char c)
 129 {
 130         char buf[16];
 131         unsigned long rc;
 132
 133         if (c == '\n')
 134                 udbg_putcLP('\r');
 135
 136         buf[0] = c;
 137         do {
 138                 rc = plpar_put_term_char(vtermno, 1, buf);
 139         } while(rc == H_BUSY);
 140 }
 141
 142 /* Buffered chars getc */
 143 static long inbuflen;
 144 static long inbuf[2];   /* must be 2 longs */
 145
 146 static int udbg_getc_pollLP(void)
 147 {
 148         /* The interface is tricky because it may return up to 16 chars.
 149          * We save them statically for future calls to udbg_getc().
 150          */
 151         char ch, *buf = (char *)inbuf;
 152         int i;
 153         long rc;
 154         if (inbuflen == 0) {
 155                 /* get some more chars. */
 156                 inbuflen = 0;
 157                 rc = plpar_get_term_char(vtermno, &inbuflen, buf);
 158                 if (rc != H_SUCCESS)
 159                         inbuflen = 0;   /* otherwise inbuflen is garbage */
 160         }
 161         if (inbuflen <= 0 || inbuflen > 16) {
 162                 /* Catch error case as well as other oddities (corruption) */
 163                 inbuflen = 0;
 164                 return -1;
 165         }
 166         ch = buf[0];
 167         for (i = 1; i < inbuflen; i++)  /* shuffle them down. */
 168                 buf[i-1] = buf[i];
 169         inbuflen--;
 170         return ch;
 171 }
 172
 173 static int udbg_getcLP(void)
 174 {
 175         int ch;
 176         for (;;) {
 177                 ch = udbg_getc_pollLP();
 178                 if (ch == -1) {
 179                         /* This shouldn't be needed...but... */
 180                         volatile unsigned long delay;
 181                         for (delay=0; delay < 2000000; delay++)
 182                                 ;
 183                 } else {
 184                         return ch;
 185                 }
 186         }
 187 }
 188
 189 /* call this from early_init() for a working debug console on
 190  * vterm capable LPAR machines
 191  */
 192 void __init udbg_init_debug_lpar(void)
 193 {
 194         vtermno = 0;
 195         udbg_putc = udbg_putcLP;
 196         udbg_getc = udbg_getcLP;
 197         udbg_getc_poll = udbg_getc_pollLP;
 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         int add_console;
 207
 208         /* find the boot console from /chosen/stdout */
 209         if (!of_chosen)
 210                 return;
 211         name = of_get_property(of_chosen, "linux,stdout-path", NULL);
 212         if (name == NULL)
 213                 return;
 214         stdout_node = of_find_node_by_path(name);
 215         if (!stdout_node)
 216                 return;
 217         name = of_get_property(stdout_node, "name", NULL);
 218         if (!name) {
 219                 printk(KERN_WARNING "stdout node missing 'name' property!\n");
 220                 goto out;
 221         }
 222         /* The user has requested a console so this is already set up. */
 223         add_console = !strstr(cmd_line, "console=");
 224
 225         /* Check if it's a virtual terminal */
 226         if (strncmp(name, "vty", 3) != 0)
 227                 goto out;
 228         termno = of_get_property(stdout_node, "reg", NULL);
 229         if (termno == NULL)
 230                 goto out;
 231         vtermno = termno[0];
 232
 233         if (of_device_is_compatible(stdout_node, "hvterm1")) {
 234                 udbg_putc = udbg_putcLP;
 235                 udbg_getc = udbg_getcLP;
 236                 udbg_getc_poll = udbg_getc_pollLP;
 237                 if (add_console)
 238                         add_preferred_console("hvc", termno[0] & 0xff, NULL);
 239         } else if (of_device_is_compatible(stdout_node, "hvterm-protocol")) {
 240                 vtermno = termno[0];
 241                 udbg_putc = udbg_hvsi_putc;
 242                 udbg_getc = udbg_hvsi_getc;
 243                 udbg_getc_poll = udbg_hvsi_getc_poll;
 244                 if (add_console)
 245                         add_preferred_console("hvsi", termno[0] & 0xff, NULL);
 246         }
 247 out:
 248         of_node_put(stdout_node);
 249 }
 250
 251 void vpa_init(int cpu)
 252 {
 253         int hwcpu = get_hard_smp_processor_id(cpu);
 254         unsigned long addr;
 255         long ret;
 256
 257         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 258                 lppaca[cpu].vmxregs_in_use = 1;
 259
 260         addr = __pa(&lppaca[cpu]);
 261         ret = register_vpa(hwcpu, addr);
 262
 263         if (ret) {
 264                 printk(KERN_ERR "WARNING: vpa_init: VPA registration for "
 265                                 "cpu %d (hw %d) of area %lx returns %ld\n",
 266                                 cpu, hwcpu, addr, ret);
 267                 return;
 268         }
 269         /*
 270          * PAPR says this feature is SLB-Buffer but firmware never
 271          * reports that.  All SPLPAR support SLB shadow buffer.
 272          */
 273         addr = __pa(&slb_shadow[cpu]);
 274         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 275                 ret = register_slb_shadow(hwcpu, addr);
 276                 if (ret)
 277                         printk(KERN_ERR
 278                                "WARNING: vpa_init: SLB shadow buffer "
 279                                "registration for cpu %d (hw %d) of area %lx "
 280                                "returns %ld\n", cpu, hwcpu, addr, ret);
 281         }
 282 }
 283
 284 static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
 285                               unsigned long va, unsigned long pa,
 286                               unsigned long rflags, unsigned long vflags,
 287                               int psize, int ssize)
 288 {
 289         unsigned long lpar_rc;
 290         unsigned long flags;
 291         unsigned long slot;
 292         unsigned long hpte_v, hpte_r;
 293
 294         if (!(vflags & HPTE_V_BOLTED))
 295                 DBG_LOW("hpte_insert(group=%lx, va=%016lx, pa=%016lx, "
 296                         "rflags=%lx, vflags=%lx, psize=%d)\n",
 297                 hpte_group, va, pa, rflags, vflags, psize);
 298
 299         hpte_v = hpte_encode_v(va, psize, ssize) | vflags | HPTE_V_VALID;
 300         hpte_r = hpte_encode_r(pa, psize) | rflags;
 301
 302         if (!(vflags & HPTE_V_BOLTED))
 303                 DBG_LOW(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
 304
 305         /* Now fill in the actual HPTE */
 306         /* Set CEC cookie to 0         */
 307         /* Zero page = 0               */
 308         /* I-cache Invalidate = 0      */
 309         /* I-cache synchronize = 0     */
 310         /* Exact = 0                   */
 311         flags = 0;
 312
 313         /* Make pHyp happy */
 314         if (rflags & (_PAGE_GUARDED|_PAGE_NO_CACHE))
 315                 hpte_r &= ~_PAGE_COHERENT;
 316
 317         lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
 318         if (unlikely(lpar_rc == H_PTEG_FULL)) {
 319                 if (!(vflags & HPTE_V_BOLTED))
 320                         DBG_LOW(" full\n");
 321                 return -1;
 322         }
 323
 324         /*
 325          * Since we try and ioremap PHBs we don't own, the pte insert
 326          * will fail. However we must catch the failure in hash_page
 327          * or we will loop forever, so return -2 in this case.
 328          */
 329         if (unlikely(lpar_rc != H_SUCCESS)) {
 330                 if (!(vflags & HPTE_V_BOLTED))
 331                         DBG_LOW(" lpar err %d\n", lpar_rc);
 332                 return -2;
 333         }
 334         if (!(vflags & HPTE_V_BOLTED))
 335                 DBG_LOW(" -> slot: %d\n", slot & 7);
 336
 337         /* Because of iSeries, we have to pass down the secondary
 338          * bucket bit here as well
 339          */
 340         return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
 341 }
 342
 343 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
 344
 345 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
 346 {
 347         unsigned long slot_offset;
 348         unsigned long lpar_rc;
 349         int i;
 350         unsigned long dummy1, dummy2;
 351
 352         /* pick a random slot to start at */
 353         slot_offset = mftb() & 0x7;
 354
 355         for (i = 0; i < HPTES_PER_GROUP; i++) {
 356
 357                 /* don't remove a bolted entry */
 358                 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
 359                                            (0x1UL << 4), &dummy1, &dummy2);
 360                 if (lpar_rc == H_SUCCESS)
 361                         return i;
 362                 BUG_ON(lpar_rc != H_NOT_FOUND);
 363
 364                 slot_offset++;
 365                 slot_offset &= 0x7;
 366         }
 367
 368         return -1;
 369 }
 370
 371 static void pSeries_lpar_hptab_clear(void)
 372 {
 373         unsigned long size_bytes = 1UL << ppc64_pft_size;
 374         unsigned long hpte_count = size_bytes >> 4;
 375         unsigned long dummy1, dummy2, dword0;
 376         long lpar_rc;
 377         int i;
 378
 379         /* TODO: Use bulk call */
 380         for (i = 0; i < hpte_count; i++) {
 381                 /* dont remove HPTEs with VRMA mappings */
 382                 lpar_rc = plpar_pte_remove_raw(H_ANDCOND, i, HPTE_V_1TB_SEG,
 383                                                 &dummy1, &dummy2);
 384                 if (lpar_rc == H_NOT_FOUND) {
 385                         lpar_rc = plpar_pte_read_raw(0, i, &dword0, &dummy1);
 386                         if (!lpar_rc && ((dword0 & HPTE_V_VRMA_MASK)
 387                                 != HPTE_V_VRMA_MASK))
 388                                 /* Can be hpte for 1TB Seg. So remove it */
 389                                 plpar_pte_remove_raw(0, i, 0, &dummy1, &dummy2);
 390                 }
 391         }
 392 }
 393
 394 /*
 395  * This computes the AVPN and B fields of the first dword of a HPTE,
 396  * for use when we want to match an existing PTE.  The bottom 7 bits
 397  * of the returned value are zero.
 398  */
 399 static inline unsigned long hpte_encode_avpn(unsigned long va, int psize,
 400                                              int ssize)
 401 {
 402         unsigned long v;
 403
 404         v = (va >> 23) & ~(mmu_psize_defs[psize].avpnm);
 405         v <<= HPTE_V_AVPN_SHIFT;
 406         v |= ((unsigned long) ssize) << HPTE_V_SSIZE_SHIFT;
 407         return v;
 408 }
 409
 410 /*
 411  * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
 412  * the low 3 bits of flags happen to line up.  So no transform is needed.
 413  * We can probably optimize here and assume the high bits of newpp are
 414  * already zero.  For now I am paranoid.
 415  */
 416 static long pSeries_lpar_hpte_updatepp(unsigned long slot,
 417                                        unsigned long newpp,
 418                                        unsigned long va,
 419                                        int psize, int ssize, int local)
 420 {
 421         unsigned long lpar_rc;
 422         unsigned long flags = (newpp & 7) | H_AVPN;
 423         unsigned long want_v;
 424
 425         want_v = hpte_encode_avpn(va, psize, ssize);
 426
 427         DBG_LOW("    update: avpnv=%016lx, hash=%016lx, f=%x, psize: %d ... ",
 428                 want_v, slot, flags, psize);
 429
 430         lpar_rc = plpar_pte_protect(flags, slot, want_v);
 431
 432         if (lpar_rc == H_NOT_FOUND) {
 433                 DBG_LOW("not found !\n");
 434                 return -1;
 435         }
 436
 437         DBG_LOW("ok\n");
 438
 439         BUG_ON(lpar_rc != H_SUCCESS);
 440
 441         return 0;
 442 }
 443
 444 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
 445 {
 446         unsigned long dword0;
 447         unsigned long lpar_rc;
 448         unsigned long dummy_word1;
 449         unsigned long flags;
 450
 451         /* Read 1 pte at a time                        */
 452         /* Do not need RPN to logical page translation */
 453         /* No cross CEC PFT access                     */
 454         flags = 0;
 455
 456         lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
 457
 458         BUG_ON(lpar_rc != H_SUCCESS);
 459
 460         return dword0;
 461 }
 462
 463 static long pSeries_lpar_hpte_find(unsigned long va, int psize, int ssize)
 464 {
 465         unsigned long hash;
 466         unsigned long i;
 467         long slot;
 468         unsigned long want_v, hpte_v;
 469
 470         hash = hpt_hash(va, mmu_psize_defs[psize].shift, ssize);
 471         want_v = hpte_encode_avpn(va, psize, ssize);
 472
 473         /* Bolted entries are always in the primary group */
 474         slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
 475         for (i = 0; i < HPTES_PER_GROUP; i++) {
 476                 hpte_v = pSeries_lpar_hpte_getword0(slot);
 477
 478                 if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID))
 479                         /* HPTE matches */
 480                         return slot;
 481                 ++slot;
 482         }
 483
 484         return -1;
 485 }
 486
 487 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
 488                                              unsigned long ea,
 489                                              int psize, int ssize)
 490 {
 491         unsigned long lpar_rc, slot, vsid, va, flags;
 492
 493         vsid = get_kernel_vsid(ea, ssize);
 494         va = hpt_va(ea, vsid, ssize);
 495
 496         slot = pSeries_lpar_hpte_find(va, psize, ssize);
 497         BUG_ON(slot == -1);
 498
 499         flags = newpp & 7;
 500         lpar_rc = plpar_pte_protect(flags, slot, 0);
 501
 502         BUG_ON(lpar_rc != H_SUCCESS);
 503 }
 504
 505 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
 506                                          int psize, int ssize, int local)
 507 {
 508         unsigned long want_v;
 509         unsigned long lpar_rc;
 510         unsigned long dummy1, dummy2;
 511
 512         DBG_LOW("    inval : slot=%lx, va=%016lx, psize: %d, local: %d",
 513                 slot, va, psize, local);
 514
 515         want_v = hpte_encode_avpn(va, psize, ssize);
 516         lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2);
 517         if (lpar_rc == H_NOT_FOUND)
 518                 return;
 519
 520         BUG_ON(lpar_rc != H_SUCCESS);
 521 }
 522
 523 /* Flag bits for H_BULK_REMOVE */
 524 #define HBR_REQUEST     0x4000000000000000UL
 525 #define HBR_RESPONSE    0x8000000000000000UL
 526 #define HBR_END         0xc000000000000000UL
 527 #define HBR_AVPN        0x0200000000000000UL
 528 #define HBR_ANDCOND     0x0100000000000000UL
 529
 530 /*
 531  * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
 532  * lock.
 533  */
 534 static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
 535 {
 536         unsigned long i, pix, rc;
 537         unsigned long flags = 0;
 538         struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
 539         int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE);
 540         unsigned long param[9];
 541         unsigned long va;
 542         unsigned long hash, index, shift, hidx, slot;
 543         real_pte_t pte;
 544         int psize, ssize;
 545
 546         if (lock_tlbie)
 547                 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
 548
 549         psize = batch->psize;
 550         ssize = batch->ssize;
 551         pix = 0;
 552         for (i = 0; i < number; i++) {
 553                 va = batch->vaddr[i];
 554                 pte = batch->pte[i];
 555                 pte_iterate_hashed_subpages(pte, psize, va, index, shift) {
 556                         hash = hpt_hash(va, shift, ssize);
 557                         hidx = __rpte_to_hidx(pte, index);
 558                         if (hidx & _PTEIDX_SECONDARY)
 559                                 hash = ~hash;
 560                         slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
 561                         slot += hidx & _PTEIDX_GROUP_IX;
 562                         if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
 563                                 pSeries_lpar_hpte_invalidate(slot, va, psize,
 564                                                              ssize, local);
 565                         } else {
 566                                 param[pix] = HBR_REQUEST | HBR_AVPN | slot;
 567                                 param[pix+1] = hpte_encode_avpn(va, psize,
 568                                                                 ssize);
 569                                 pix += 2;
 570                                 if (pix == 8) {
 571                                         rc = plpar_hcall9(H_BULK_REMOVE, param,
 572                                                 param[0], param[1], param[2],
 573                                                 param[3], param[4], param[5],
 574                                                 param[6], param[7]);
 575                                         BUG_ON(rc != H_SUCCESS);
 576                                         pix = 0;
 577                                 }
 578                         }
 579                 } pte_iterate_hashed_end();
 580         }
 581         if (pix) {
 582                 param[pix] = HBR_END;
 583                 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
 584                                   param[2], param[3], param[4], param[5],
 585                                   param[6], param[7]);
 586                 BUG_ON(rc != H_SUCCESS);
 587         }
 588
 589         if (lock_tlbie)
 590                 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
 591 }
 592
 593 void __init hpte_init_lpar(void)
 594 {
 595         ppc_md.hpte_invalidate  = pSeries_lpar_hpte_invalidate;
 596         ppc_md.hpte_updatepp    = pSeries_lpar_hpte_updatepp;
 597         ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
 598         ppc_md.hpte_insert      = pSeries_lpar_hpte_insert;
 599         ppc_md.hpte_remove      = pSeries_lpar_hpte_remove;
 600         ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
 601         ppc_md.hpte_clear_all   = pSeries_lpar_hptab_clear;
 602 }