arch/ppc64/kernel/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 #define DEBUG
  23
  24 #include <linux/config.h>
  25 #include <linux/kernel.h>
  26 #include <linux/dma-mapping.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/ppcdebug.h>
  35 #include <asm/iommu.h>
  36 #include <asm/tlbflush.h>
  37 #include <asm/tlb.h>
  38 #include <asm/prom.h>
  39 #include <asm/abs_addr.h>
  40 #include <asm/cputable.h>
  41 #include <asm/plpar_wrappers.h>
  42
  43 #ifdef DEBUG
  44 #define DBG(fmt...) udbg_printf(fmt)
  45 #else
  46 #define DBG(fmt...)
  47 #endif
  48
  49 /* in pSeries_hvCall.S */
  50 EXPORT_SYMBOL(plpar_hcall);
  51 EXPORT_SYMBOL(plpar_hcall_4out);
  52 EXPORT_SYMBOL(plpar_hcall_norets);
  53 EXPORT_SYMBOL(plpar_hcall_8arg_2ret);
  54
  55 extern void fw_feature_init(void);
  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(unsigned 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 unsigned char 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(unsigned 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 unsigned char 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 udbg_init_debug_lpar(void)
 194 {
 195         vtermno = 0;
 196         ppc_md.udbg_putc = udbg_putcLP;
 197         ppc_md.udbg_getc = udbg_getcLP;
 198         ppc_md.udbg_getc_poll = udbg_getc_pollLP;
 199 }
 200
 201 /* returns 0 if couldn't find or use /chosen/stdout as console */
 202 int find_udbg_vterm(void)
 203 {
 204         struct device_node *stdout_node;
 205         u32 *termno;
 206         char *name;
 207         int found = 0;
 208
 209         /* find the boot console from /chosen/stdout */
 210         if (!of_chosen)
 211                 return 0;
 212         name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
 213         if (name == NULL)
 214                 return 0;
 215         stdout_node = of_find_node_by_path(name);
 216         if (!stdout_node)
 217                 return 0;
 218
 219         /* now we have the stdout node; figure out what type of device it is. */
 220         name = (char *)get_property(stdout_node, "name", NULL);
 221         if (!name) {
 222                 printk(KERN_WARNING "stdout node missing 'name' property!\n");
 223                 goto out;
 224         }
 225
 226         if (strncmp(name, "vty", 3) == 0) {
 227                 if (device_is_compatible(stdout_node, "hvterm1")) {
 228                         termno = (u32 *)get_property(stdout_node, "reg", NULL);
 229                         if (termno) {
 230                                 vtermno = termno[0];
 231                                 ppc_md.udbg_putc = udbg_putcLP;
 232                                 ppc_md.udbg_getc = udbg_getcLP;
 233                                 ppc_md.udbg_getc_poll = udbg_getc_pollLP;
 234                                 found = 1;
 235                         }
 236                 } else if (device_is_compatible(stdout_node, "hvterm-protocol")) {
 237                         termno = (u32 *)get_property(stdout_node, "reg", NULL);
 238                         if (termno) {
 239                                 vtermno = termno[0];
 240                                 ppc_md.udbg_putc = udbg_hvsi_putc;
 241                                 ppc_md.udbg_getc = udbg_hvsi_getc;
 242                                 ppc_md.udbg_getc_poll = udbg_hvsi_getc_poll;
 243                                 found = 1;
 244                         }
 245                 }
 246         } else if (strncmp(name, "serial", 6)) {
 247                 /* XXX fix ISA serial console */
 248                 printk(KERN_WARNING "serial stdout on LPAR ('%s')! "
 249                                 "can't print udbg messages\n",
 250                        stdout_node->full_name);
 251         } else {
 252                 printk(KERN_WARNING "don't know how to print to stdout '%s'\n",
 253                        stdout_node->full_name);
 254         }
 255
 256 out:
 257         of_node_put(stdout_node);
 258         return found;
 259 }
 260
 261 void vpa_init(int cpu)
 262 {
 263         int hwcpu = get_hard_smp_processor_id(cpu);
 264         unsigned long vpa = (unsigned long)&(paca[cpu].lppaca);
 265         long ret;
 266         unsigned long flags;
 267
 268         /* Register the Virtual Processor Area (VPA) */
 269         flags = 1UL << (63 - 18);
 270         ret = register_vpa(flags, hwcpu, __pa(vpa));
 271
 272         if (ret)
 273                 printk(KERN_ERR "WARNING: vpa_init: VPA registration for "
 274                                 "cpu %d (hw %d) of area %lx returns %ld\n",
 275                                 cpu, hwcpu, __pa(vpa), ret);
 276 }
 277
 278 long pSeries_lpar_hpte_insert(unsigned long hpte_group,
 279                               unsigned long va, unsigned long prpn,
 280                               int secondary, unsigned long hpteflags,
 281                               int bolted, int large)
 282 {
 283         unsigned long arpn = physRpn_to_absRpn(prpn);
 284         unsigned long lpar_rc;
 285         unsigned long flags;
 286         unsigned long slot;
 287         HPTE lhpte;
 288         unsigned long dummy0, dummy1;
 289
 290         /* Fill in the local HPTE with absolute rpn, avpn and flags */
 291         lhpte.dw1.dword1      = 0;
 292         lhpte.dw1.dw1.rpn     = arpn;
 293         lhpte.dw1.flags.flags = hpteflags;
 294
 295         lhpte.dw0.dword0      = 0;
 296         lhpte.dw0.dw0.avpn    = va >> 23;
 297         lhpte.dw0.dw0.h       = secondary;
 298         lhpte.dw0.dw0.bolted  = bolted;
 299         lhpte.dw0.dw0.v       = 1;
 300
 301         if (large) {
 302                 lhpte.dw0.dw0.l = 1;
 303                 lhpte.dw0.dw0.avpn &= ~0x1UL;
 304         }
 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         /* XXX why is this here? - Anton */
 315         if (hpteflags & (_PAGE_GUARDED|_PAGE_NO_CACHE))
 316                 lhpte.dw1.flags.flags &= ~_PAGE_COHERENT;
 317
 318         lpar_rc = plpar_hcall(H_ENTER, flags, hpte_group, lhpte.dw0.dword0,
 319                               lhpte.dw1.dword1, &slot, &dummy0, &dummy1);
 320
 321         if (unlikely(lpar_rc == H_PTEG_Full))
 322                 return -1;
 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                 return -2;
 331
 332         /* Because of iSeries, we have to pass down the secondary
 333          * bucket bit here as well
 334          */
 335         return (slot & 7) | (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
 356                 if (lpar_rc == H_Success)
 357                         return i;
 358
 359                 BUG_ON(lpar_rc != H_Not_Found);
 360
 361                 slot_offset++;
 362                 slot_offset &= 0x7;
 363         }
 364
 365         return -1;
 366 }
 367
 368 static void pSeries_lpar_hptab_clear(void)
 369 {
 370         unsigned long size_bytes = 1UL << ppc64_pft_size;
 371         unsigned long hpte_count = size_bytes >> 4;
 372         unsigned long dummy1, dummy2;
 373         int i;
 374
 375         /* TODO: Use bulk call */
 376         for (i = 0; i < hpte_count; i++)
 377                 plpar_pte_remove(0, i, 0, &dummy1, &dummy2);
 378 }
 379
 380 /*
 381  * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
 382  * the low 3 bits of flags happen to line up.  So no transform is needed.
 383  * We can probably optimize here and assume the high bits of newpp are
 384  * already zero.  For now I am paranoid.
 385  */
 386 static long pSeries_lpar_hpte_updatepp(unsigned long slot, unsigned long newpp,
 387                                        unsigned long va, int large, int local)
 388 {
 389         unsigned long lpar_rc;
 390         unsigned long flags = (newpp & 7) | H_AVPN;
 391         unsigned long avpn = va >> 23;
 392
 393         if (large)
 394                 avpn &= ~0x1UL;
 395
 396         lpar_rc = plpar_pte_protect(flags, slot, (avpn << 7));
 397
 398         if (lpar_rc == H_Not_Found)
 399                 return -1;
 400
 401         BUG_ON(lpar_rc != H_Success);
 402
 403         return 0;
 404 }
 405
 406 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
 407 {
 408         unsigned long dword0;
 409         unsigned long lpar_rc;
 410         unsigned long dummy_word1;
 411         unsigned long flags;
 412
 413         /* Read 1 pte at a time                        */
 414         /* Do not need RPN to logical page translation */
 415         /* No cross CEC PFT access                     */
 416         flags = 0;
 417
 418         lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
 419
 420         BUG_ON(lpar_rc != H_Success);
 421
 422         return dword0;
 423 }
 424
 425 static long pSeries_lpar_hpte_find(unsigned long vpn)
 426 {
 427         unsigned long hash;
 428         unsigned long i, j;
 429         long slot;
 430         union {
 431                 unsigned long dword0;
 432                 Hpte_dword0 dw0;
 433         } hpte_dw0;
 434         Hpte_dword0 dw0;
 435
 436         hash = hpt_hash(vpn, 0);
 437
 438         for (j = 0; j < 2; j++) {
 439                 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
 440                 for (i = 0; i < HPTES_PER_GROUP; i++) {
 441                         hpte_dw0.dword0 = pSeries_lpar_hpte_getword0(slot);
 442                         dw0 = hpte_dw0.dw0;
 443
 444                         if ((dw0.avpn == (vpn >> 11)) && dw0.v &&
 445                             (dw0.h == j)) {
 446                                 /* HPTE matches */
 447                                 if (j)
 448                                         slot = -slot;
 449                                 return slot;
 450                         }
 451                         ++slot;
 452                 }
 453                 hash = ~hash;
 454         }
 455
 456         return -1;
 457 }
 458
 459 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
 460                                              unsigned long ea)
 461 {
 462         unsigned long lpar_rc;
 463         unsigned long vsid, va, vpn, flags;
 464         long slot;
 465
 466         vsid = get_kernel_vsid(ea);
 467         va = (vsid << 28) | (ea & 0x0fffffff);
 468         vpn = va >> PAGE_SHIFT;
 469
 470         slot = pSeries_lpar_hpte_find(vpn);
 471         BUG_ON(slot == -1);
 472
 473         flags = newpp & 7;
 474         lpar_rc = plpar_pte_protect(flags, slot, 0);
 475
 476         BUG_ON(lpar_rc != H_Success);
 477 }
 478
 479 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
 480                                          int large, int local)
 481 {
 482         unsigned long avpn = va >> 23;
 483         unsigned long lpar_rc;
 484         unsigned long dummy1, dummy2;
 485
 486         if (large)
 487                 avpn &= ~0x1UL;
 488
 489         lpar_rc = plpar_pte_remove(H_AVPN, slot, (avpn << 7), &dummy1,
 490                                    &dummy2);
 491
 492         if (lpar_rc == H_Not_Found)
 493                 return;
 494
 495         BUG_ON(lpar_rc != H_Success);
 496 }
 497
 498 /*
 499  * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
 500  * lock.
 501  */
 502 void pSeries_lpar_flush_hash_range(unsigned long context, unsigned long number,
 503                                    int local)
 504 {
 505         int i;
 506         unsigned long flags = 0;
 507         struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
 508         int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE);
 509
 510         if (lock_tlbie)
 511                 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
 512
 513         for (i = 0; i < number; i++)
 514                 flush_hash_page(context, batch->addr[i], batch->pte[i], local);
 515
 516         if (lock_tlbie)
 517                 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
 518 }
 519
 520 void hpte_init_lpar(void)
 521 {
 522         ppc_md.hpte_invalidate  = pSeries_lpar_hpte_invalidate;
 523         ppc_md.hpte_updatepp    = pSeries_lpar_hpte_updatepp;
 524         ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
 525         ppc_md.hpte_insert      = pSeries_lpar_hpte_insert;
 526         ppc_md.hpte_remove      = pSeries_lpar_hpte_remove;
 527         ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
 528         ppc_md.hpte_clear_all   = pSeries_lpar_hptab_clear;
 529
 530         htab_finish_init();
 531 }