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/abs_addr.h>
  39 #include <asm/cputable.h>
  40 #include <asm/udbg.h>
  41 #include <asm/smp.h>
  42
  43 #include "plpar_wrappers.h"
  44
  45 #ifdef DEBUG_LOW
  46 #define DBG_LOW(fmt...) do { udbg_printf(fmt); } while(0)
  47 #else
  48 #define DBG_LOW(fmt...) do { } while(0)
  49 #endif
  50
  51 /* in hvCall.S */
  52 EXPORT_SYMBOL(plpar_hcall);
  53 EXPORT_SYMBOL(plpar_hcall9);
  54 EXPORT_SYMBOL(plpar_hcall_norets);
  55
  56 extern void pSeries_find_serial_port(void);
  57
  58
  59 int vtermno;    /* virtual terminal# for udbg  */
  60
  61 #define __ALIGNED__ __attribute__((__aligned__(sizeof(long))))
  62 static void udbg_hvsi_putc(char c)
  63 {
  64         /* packet's seqno isn't used anyways */
  65         uint8_t packet[] __ALIGNED__ = { 0xff, 5, 0, 0, c };
  66         int rc;
  67
  68         if (c == '\n')
  69                 udbg_hvsi_putc('\r');
  70
  71         do {
  72                 rc = plpar_put_term_char(vtermno, sizeof(packet), packet);
  73         } while (rc == H_BUSY);
  74 }
  75
  76 static long hvsi_udbg_buf_len;
  77 static uint8_t hvsi_udbg_buf[256];
  78
  79 static int udbg_hvsi_getc_poll(void)
  80 {
  81         unsigned char ch;
  82         int rc, i;
  83
  84         if (hvsi_udbg_buf_len == 0) {
  85                 rc = plpar_get_term_char(vtermno, &hvsi_udbg_buf_len, hvsi_udbg_buf);
  86                 if (rc != H_SUCCESS || hvsi_udbg_buf[0] != 0xff) {
  87                         /* bad read or non-data packet */
  88                         hvsi_udbg_buf_len = 0;
  89                 } else {
  90                         /* remove the packet header */
  91                         for (i = 4; i < hvsi_udbg_buf_len; i++)
  92                                 hvsi_udbg_buf[i-4] = hvsi_udbg_buf[i];
  93                         hvsi_udbg_buf_len -= 4;
  94                 }
  95         }
  96
  97         if (hvsi_udbg_buf_len <= 0 || hvsi_udbg_buf_len > 256) {
  98                 /* no data ready */
  99                 hvsi_udbg_buf_len = 0;
 100                 return -1;
 101         }
 102
 103         ch = hvsi_udbg_buf[0];
 104         /* shift remaining data down */
 105         for (i = 1; i < hvsi_udbg_buf_len; i++) {
 106                 hvsi_udbg_buf[i-1] = hvsi_udbg_buf[i];
 107         }
 108         hvsi_udbg_buf_len--;
 109
 110         return ch;
 111 }
 112
 113 static int udbg_hvsi_getc(void)
 114 {
 115         int ch;
 116         for (;;) {
 117                 ch = udbg_hvsi_getc_poll();
 118                 if (ch == -1) {
 119                         /* This shouldn't be needed...but... */
 120                         volatile unsigned long delay;
 121                         for (delay=0; delay < 2000000; delay++)
 122                                 ;
 123                 } else {
 124                         return ch;
 125                 }
 126         }
 127 }
 128
 129 static void udbg_putcLP(char c)
 130 {
 131         char buf[16];
 132         unsigned long rc;
 133
 134         if (c == '\n')
 135                 udbg_putcLP('\r');
 136
 137         buf[0] = c;
 138         do {
 139                 rc = plpar_put_term_char(vtermno, 1, buf);
 140         } while(rc == H_BUSY);
 141 }
 142
 143 /* Buffered chars getc */
 144 static long inbuflen;
 145 static long inbuf[2];   /* must be 2 longs */
 146
 147 static int udbg_getc_pollLP(void)
 148 {
 149         /* The interface is tricky because it may return up to 16 chars.
 150          * We save them statically for future calls to udbg_getc().
 151          */
 152         char ch, *buf = (char *)inbuf;
 153         int i;
 154         long rc;
 155         if (inbuflen == 0) {
 156                 /* get some more chars. */
 157                 inbuflen = 0;
 158                 rc = plpar_get_term_char(vtermno, &inbuflen, buf);
 159                 if (rc != H_SUCCESS)
 160                         inbuflen = 0;   /* otherwise inbuflen is garbage */
 161         }
 162         if (inbuflen <= 0 || inbuflen > 16) {
 163                 /* Catch error case as well as other oddities (corruption) */
 164                 inbuflen = 0;
 165                 return -1;
 166         }
 167         ch = buf[0];
 168         for (i = 1; i < inbuflen; i++)  /* shuffle them down. */
 169                 buf[i-1] = buf[i];
 170         inbuflen--;
 171         return ch;
 172 }
 173
 174 static int udbg_getcLP(void)
 175 {
 176         int ch;
 177         for (;;) {
 178                 ch = udbg_getc_pollLP();
 179                 if (ch == -1) {
 180                         /* This shouldn't be needed...but... */
 181                         volatile unsigned long delay;
 182                         for (delay=0; delay < 2000000; delay++)
 183                                 ;
 184                 } else {
 185                         return ch;
 186                 }
 187         }
 188 }
 189
 190 /* call this from early_init() for a working debug console on
 191  * vterm capable LPAR machines
 192  */
 193 void __init udbg_init_debug_lpar(void)
 194 {
 195         vtermno = 0;
 196         udbg_putc = udbg_putcLP;
 197         udbg_getc = udbg_getcLP;
 198         udbg_getc_poll = udbg_getc_pollLP;
 199 }
 200
 201 /* returns 0 if couldn't find or use /chosen/stdout as console */
 202 void __init find_udbg_vterm(void)
 203 {
 204         struct device_node *stdout_node;
 205         const u32 *termno;
 206         const char *name;
 207         int add_console;
 208
 209         /* find the boot console from /chosen/stdout */
 210         if (!of_chosen)
 211                 return;
 212         name = get_property(of_chosen, "linux,stdout-path", NULL);
 213         if (name == NULL)
 214                 return;
 215         stdout_node = of_find_node_by_path(name);
 216         if (!stdout_node)
 217                 return;
 218         name = get_property(stdout_node, "name", NULL);
 219         if (!name) {
 220                 printk(KERN_WARNING "stdout node missing 'name' property!\n");
 221                 goto out;
 222         }
 223         /* The user has requested a console so this is already set up. */
 224         add_console = !strstr(cmd_line, "console=");
 225
 226         /* Check if it's a virtual terminal */
 227         if (strncmp(name, "vty", 3) != 0)
 228                 goto out;
 229         termno = get_property(stdout_node, "reg", NULL);
 230         if (termno == NULL)
 231                 goto out;
 232         vtermno = termno[0];
 233
 234         if (device_is_compatible(stdout_node, "hvterm1")) {
 235                 udbg_putc = udbg_putcLP;
 236                 udbg_getc = udbg_getcLP;
 237                 udbg_getc_poll = udbg_getc_pollLP;
 238                 if (add_console)
 239                         add_preferred_console("hvc", termno[0] & 0xff, NULL);
 240         } else if (device_is_compatible(stdout_node, "hvterm-protocol")) {
 241                 vtermno = termno[0];
 242                 udbg_putc = udbg_hvsi_putc;
 243                 udbg_getc = udbg_hvsi_getc;
 244                 udbg_getc_poll = udbg_hvsi_getc_poll;
 245                 if (add_console)
 246                         add_preferred_console("hvsi", termno[0] & 0xff, NULL);
 247         }
 248 out:
 249         of_node_put(stdout_node);
 250 }
 251
 252 void vpa_init(int cpu)
 253 {
 254         int hwcpu = get_hard_smp_processor_id(cpu);
 255         unsigned long addr;
 256         long ret;
 257
 258         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 259                 lppaca[cpu].vmxregs_in_use = 1;
 260
 261         addr = __pa(&lppaca[cpu]);
 262         ret = register_vpa(hwcpu, addr);
 263
 264         if (ret) {
 265                 printk(KERN_ERR "WARNING: vpa_init: VPA registration for "
 266                                 "cpu %d (hw %d) of area %lx returns %ld\n",
 267                                 cpu, hwcpu, addr, ret);
 268                 return;
 269         }
 270         /*
 271          * PAPR says this feature is SLB-Buffer but firmware never
 272          * reports that.  All SPLPAR support SLB shadow buffer.
 273          */
 274         addr = __pa(&slb_shadow[cpu]);
 275         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 276                 ret = register_slb_shadow(hwcpu, addr);
 277                 if (ret)
 278                         printk(KERN_ERR
 279                                "WARNING: vpa_init: SLB shadow buffer "
 280                                "registration for cpu %d (hw %d) of area %lx "
 281                                "returns %ld\n", cpu, hwcpu, addr, ret);
 282         }
 283 }
 284
 285 static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
 286                               unsigned long va, unsigned long pa,
 287                               unsigned long rflags, unsigned long vflags,
 288                               int psize)
 289 {
 290         unsigned long lpar_rc;
 291         unsigned long flags;
 292         unsigned long slot;
 293         unsigned long hpte_v, hpte_r;
 294
 295         if (!(vflags & HPTE_V_BOLTED))
 296                 DBG_LOW("hpte_insert(group=%lx, va=%016lx, pa=%016lx, "
 297                         "rflags=%lx, vflags=%lx, psize=%d)\n",
 298                 hpte_group, va, pa, rflags, vflags, psize);
 299
 300         hpte_v = hpte_encode_v(va, psize) | vflags | HPTE_V_VALID;
 301         hpte_r = hpte_encode_r(pa, psize) | rflags;
 302
 303         if (!(vflags & HPTE_V_BOLTED))
 304                 DBG_LOW(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
 305
 306         /* Now fill in the actual HPTE */
 307         /* Set CEC cookie to 0         */
 308         /* Zero page = 0               */
 309         /* I-cache Invalidate = 0      */
 310         /* I-cache synchronize = 0     */
 311         /* Exact = 0                   */
 312         flags = 0;
 313
 314         /* Make pHyp happy */
 315         if (rflags & (_PAGE_GUARDED|_PAGE_NO_CACHE))
 316                 hpte_r &= ~_PAGE_COHERENT;
 317
 318         lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
 319         if (unlikely(lpar_rc == H_PTEG_FULL)) {
 320                 if (!(vflags & HPTE_V_BOLTED))
 321                         DBG_LOW(" full\n");
 322                 return -1;
 323         }
 324
 325         /*
 326          * Since we try and ioremap PHBs we don't own, the pte insert
 327          * will fail. However we must catch the failure in hash_page
 328          * or we will loop forever, so return -2 in this case.
 329          */
 330         if (unlikely(lpar_rc != H_SUCCESS)) {
 331                 if (!(vflags & HPTE_V_BOLTED))
 332                         DBG_LOW(" lpar err %d\n", lpar_rc);
 333                 return -2;
 334         }
 335         if (!(vflags & HPTE_V_BOLTED))
 336                 DBG_LOW(" -> slot: %d\n", slot & 7);
 337
 338         /* Because of iSeries, we have to pass down the secondary
 339          * bucket bit here as well
 340          */
 341         return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
 342 }
 343
 344 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
 345
 346 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
 347 {
 348         unsigned long slot_offset;
 349         unsigned long lpar_rc;
 350         int i;
 351         unsigned long dummy1, dummy2;
 352
 353         /* pick a random slot to start at */
 354         slot_offset = mftb() & 0x7;
 355
 356         for (i = 0; i < HPTES_PER_GROUP; i++) {
 357
 358                 /* don't remove a bolted entry */
 359                 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
 360                                            (0x1UL << 4), &dummy1, &dummy2);
 361                 if (lpar_rc == H_SUCCESS)
 362                         return i;
 363                 BUG_ON(lpar_rc != H_NOT_FOUND);
 364
 365                 slot_offset++;
 366                 slot_offset &= 0x7;
 367         }
 368
 369         return -1;
 370 }
 371
 372 static void pSeries_lpar_hptab_clear(void)
 373 {
 374         unsigned long size_bytes = 1UL << ppc64_pft_size;
 375         unsigned long hpte_count = size_bytes >> 4;
 376         unsigned long dummy1, dummy2;
 377         int i;
 378
 379         /* TODO: Use bulk call */
 380         for (i = 0; i < hpte_count; i++)
 381                 plpar_pte_remove(0, i, 0, &dummy1, &dummy2);
 382 }
 383
 384 /*
 385  * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
 386  * the low 3 bits of flags happen to line up.  So no transform is needed.
 387  * We can probably optimize here and assume the high bits of newpp are
 388  * already zero.  For now I am paranoid.
 389  */
 390 static long pSeries_lpar_hpte_updatepp(unsigned long slot,
 391                                        unsigned long newpp,
 392                                        unsigned long va,
 393                                        int psize, int local)
 394 {
 395         unsigned long lpar_rc;
 396         unsigned long flags = (newpp & 7) | H_AVPN;
 397         unsigned long want_v;
 398
 399         want_v = hpte_encode_v(va, psize);
 400
 401         DBG_LOW("    update: avpnv=%016lx, hash=%016lx, f=%x, psize: %d ... ",
 402                 want_v & HPTE_V_AVPN, slot, flags, psize);
 403
 404         lpar_rc = plpar_pte_protect(flags, slot, want_v & HPTE_V_AVPN);
 405
 406         if (lpar_rc == H_NOT_FOUND) {
 407                 DBG_LOW("not found !\n");
 408                 return -1;
 409         }
 410
 411         DBG_LOW("ok\n");
 412
 413         BUG_ON(lpar_rc != H_SUCCESS);
 414
 415         return 0;
 416 }
 417
 418 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
 419 {
 420         unsigned long dword0;
 421         unsigned long lpar_rc;
 422         unsigned long dummy_word1;
 423         unsigned long flags;
 424
 425         /* Read 1 pte at a time                        */
 426         /* Do not need RPN to logical page translation */
 427         /* No cross CEC PFT access                     */
 428         flags = 0;
 429
 430         lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
 431
 432         BUG_ON(lpar_rc != H_SUCCESS);
 433
 434         return dword0;
 435 }
 436
 437 static long pSeries_lpar_hpte_find(unsigned long va, int psize)
 438 {
 439         unsigned long hash;
 440         unsigned long i, j;
 441         long slot;
 442         unsigned long want_v, hpte_v;
 443
 444         hash = hpt_hash(va, mmu_psize_defs[psize].shift);
 445         want_v = hpte_encode_v(va, psize);
 446
 447         for (j = 0; j < 2; j++) {
 448                 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
 449                 for (i = 0; i < HPTES_PER_GROUP; i++) {
 450                         hpte_v = pSeries_lpar_hpte_getword0(slot);
 451
 452                         if (HPTE_V_COMPARE(hpte_v, want_v)
 453                             && (hpte_v & HPTE_V_VALID)
 454                             && (!!(hpte_v & HPTE_V_SECONDARY) == j)) {
 455                                 /* HPTE matches */
 456                                 if (j)
 457                                         slot = -slot;
 458                                 return slot;
 459                         }
 460                         ++slot;
 461                 }
 462                 hash = ~hash;
 463         }
 464
 465         return -1;
 466 }
 467
 468 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
 469                                              unsigned long ea,
 470                                              int psize)
 471 {
 472         unsigned long lpar_rc, slot, vsid, va, flags;
 473
 474         vsid = get_kernel_vsid(ea);
 475         va = (vsid << 28) | (ea & 0x0fffffff);
 476
 477         slot = pSeries_lpar_hpte_find(va, psize);
 478         BUG_ON(slot == -1);
 479
 480         flags = newpp & 7;
 481         lpar_rc = plpar_pte_protect(flags, slot, 0);
 482
 483         BUG_ON(lpar_rc != H_SUCCESS);
 484 }
 485
 486 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
 487                                          int psize, int local)
 488 {
 489         unsigned long want_v;
 490         unsigned long lpar_rc;
 491         unsigned long dummy1, dummy2;
 492
 493         DBG_LOW("    inval : slot=%lx, va=%016lx, psize: %d, local: %d",
 494                 slot, va, psize, local);
 495
 496         want_v = hpte_encode_v(va, psize);
 497         lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v & HPTE_V_AVPN,
 498                                    &dummy1, &dummy2);
 499         if (lpar_rc == H_NOT_FOUND)
 500                 return;
 501
 502         BUG_ON(lpar_rc != H_SUCCESS);
 503 }
 504
 505 /* Flag bits for H_BULK_REMOVE */
 506 #define HBR_REQUEST     0x4000000000000000UL
 507 #define HBR_RESPONSE    0x8000000000000000UL
 508 #define HBR_END         0xc000000000000000UL
 509 #define HBR_AVPN        0x0200000000000000UL
 510 #define HBR_ANDCOND     0x0100000000000000UL
 511
 512 /*
 513  * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
 514  * lock.
 515  */
 516 static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
 517 {
 518         unsigned long i, pix, rc;
 519         unsigned long flags;
 520         struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
 521         int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE);
 522         unsigned long param[9];
 523         unsigned long va;
 524         unsigned long hash, index, shift, hidx, slot;
 525         real_pte_t pte;
 526         int psize;
 527
 528         if (lock_tlbie)
 529                 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
 530
 531         psize = batch->psize;
 532         pix = 0;
 533         for (i = 0; i < number; i++) {
 534                 va = batch->vaddr[i];
 535                 pte = batch->pte[i];
 536                 pte_iterate_hashed_subpages(pte, psize, va, index, shift) {
 537                         hash = hpt_hash(va, shift);
 538                         hidx = __rpte_to_hidx(pte, index);
 539                         if (hidx & _PTEIDX_SECONDARY)
 540                                 hash = ~hash;
 541                         slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
 542                         slot += hidx & _PTEIDX_GROUP_IX;
 543                         param[pix] = HBR_REQUEST | HBR_AVPN | slot;
 544                         param[pix+1] = hpte_encode_v(va, psize) & HPTE_V_AVPN;
 545                         pix += 2;
 546                         if (pix == 8) {
 547                                 rc = plpar_hcall9(H_BULK_REMOVE, param,
 548                                                 param[0], param[1], param[2],
 549                                                 param[3], param[4], param[5],
 550                                                 param[6], param[7]);
 551                                 BUG_ON(rc != H_SUCCESS);
 552                                 pix = 0;
 553                         }
 554                 } pte_iterate_hashed_end();
 555         }
 556         if (pix) {
 557                 param[pix] = HBR_END;
 558                 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
 559                                   param[2], param[3], param[4], param[5],
 560                                   param[6], param[7]);
 561                 BUG_ON(rc != H_SUCCESS);
 562         }
 563
 564         if (lock_tlbie)
 565                 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
 566 }
 567
 568 void __init hpte_init_lpar(void)
 569 {
 570         ppc_md.hpte_invalidate  = pSeries_lpar_hpte_invalidate;
 571         ppc_md.hpte_updatepp    = pSeries_lpar_hpte_updatepp;
 572         ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
 573         ppc_md.hpte_insert      = pSeries_lpar_hpte_insert;
 574         ppc_md.hpte_remove      = pSeries_lpar_hpte_remove;
 575         ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
 576         ppc_md.hpte_clear_all   = pSeries_lpar_hptab_clear;
 577 }