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 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(unsigned 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 unsigned char 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(unsigned 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 unsigned char 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 udbg_init_debug_lpar(void)
 193 {
 194         vtermno = 0;
 195         ppc_md.udbg_putc = udbg_putcLP;
 196         ppc_md.udbg_getc = udbg_getcLP;
 197         ppc_md.udbg_getc_poll = udbg_getc_pollLP;
 198 }
 199
 200 /* returns 0 if couldn't find or use /chosen/stdout as console */
 201 int find_udbg_vterm(void)
 202 {
 203         struct device_node *stdout_node;
 204         u32 *termno;
 205         char *name;
 206         int found = 0;
 207
 208         /* find the boot console from /chosen/stdout */
 209         if (!of_chosen)
 210                 return 0;
 211         name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
 212         if (name == NULL)
 213                 return 0;
 214         stdout_node = of_find_node_by_path(name);
 215         if (!stdout_node)
 216                 return 0;
 217
 218         /* now we have the stdout node; figure out what type of device it is. */
 219         name = (char *)get_property(stdout_node, "name", NULL);
 220         if (!name) {
 221                 printk(KERN_WARNING "stdout node missing 'name' property!\n");
 222                 goto out;
 223         }
 224
 225         if (strncmp(name, "vty", 3) == 0) {
 226                 if (device_is_compatible(stdout_node, "hvterm1")) {
 227                         termno = (u32 *)get_property(stdout_node, "reg", NULL);
 228                         if (termno) {
 229                                 vtermno = termno[0];
 230                                 ppc_md.udbg_putc = udbg_putcLP;
 231                                 ppc_md.udbg_getc = udbg_getcLP;
 232                                 ppc_md.udbg_getc_poll = udbg_getc_pollLP;
 233                                 found = 1;
 234                         }
 235                 } else if (device_is_compatible(stdout_node, "hvterm-protocol")) {
 236                         termno = (u32 *)get_property(stdout_node, "reg", NULL);
 237                         if (termno) {
 238                                 vtermno = termno[0];
 239                                 ppc_md.udbg_putc = udbg_hvsi_putc;
 240                                 ppc_md.udbg_getc = udbg_hvsi_getc;
 241                                 ppc_md.udbg_getc_poll = udbg_hvsi_getc_poll;
 242                                 found = 1;
 243                         }
 244                 }
 245         } else if (strncmp(name, "serial", 6)) {
 246                 /* XXX fix ISA serial console */
 247                 printk(KERN_WARNING "serial stdout on LPAR ('%s')! "
 248                                 "can't print udbg messages\n",
 249                        stdout_node->full_name);
 250         } else {
 251                 printk(KERN_WARNING "don't know how to print to stdout '%s'\n",
 252                        stdout_node->full_name);
 253         }
 254
 255 out:
 256         of_node_put(stdout_node);
 257         return found;
 258 }
 259
 260 void vpa_init(int cpu)
 261 {
 262         int hwcpu = get_hard_smp_processor_id(cpu);
 263         unsigned long vpa = (unsigned long)&(paca[cpu].lppaca);
 264         long ret;
 265         unsigned long flags;
 266
 267         /* Register the Virtual Processor Area (VPA) */
 268         flags = 1UL << (63 - 18);
 269         ret = register_vpa(flags, hwcpu, __pa(vpa));
 270
 271         if (ret)
 272                 printk(KERN_ERR "WARNING: vpa_init: VPA registration for "
 273                                 "cpu %d (hw %d) of area %lx returns %ld\n",
 274                                 cpu, hwcpu, __pa(vpa), ret);
 275 }
 276
 277 long pSeries_lpar_hpte_insert(unsigned long hpte_group,
 278                               unsigned long va, unsigned long prpn,
 279                               unsigned long vflags, unsigned long rflags)
 280 {
 281         unsigned long arpn = physRpn_to_absRpn(prpn);
 282         unsigned long lpar_rc;
 283         unsigned long flags;
 284         unsigned long slot;
 285         unsigned long hpte_v, hpte_r;
 286         unsigned long dummy0, dummy1;
 287
 288         hpte_v = ((va >> 23) << HPTE_V_AVPN_SHIFT) | vflags | HPTE_V_VALID;
 289         if (vflags & HPTE_V_LARGE)
 290                 hpte_v &= ~(1UL << HPTE_V_AVPN_SHIFT);
 291
 292         hpte_r = (arpn << HPTE_R_RPN_SHIFT) | rflags;
 293
 294         /* Now fill in the actual HPTE */
 295         /* Set CEC cookie to 0         */
 296         /* Zero page = 0               */
 297         /* I-cache Invalidate = 0      */
 298         /* I-cache synchronize = 0     */
 299         /* Exact = 0                   */
 300         flags = 0;
 301
 302         /* XXX why is this here? - Anton */
 303         if (rflags & (_PAGE_GUARDED|_PAGE_NO_CACHE))
 304                 hpte_r &= ~_PAGE_COHERENT;
 305
 306         lpar_rc = plpar_hcall(H_ENTER, flags, hpte_group, hpte_v,
 307                               hpte_r, &slot, &dummy0, &dummy1);
 308
 309         if (unlikely(lpar_rc == H_PTEG_Full))
 310                 return -1;
 311
 312         /*
 313          * Since we try and ioremap PHBs we don't own, the pte insert
 314          * will fail. However we must catch the failure in hash_page
 315          * or we will loop forever, so return -2 in this case.
 316          */
 317         if (unlikely(lpar_rc != H_Success))
 318                 return -2;
 319
 320         /* Because of iSeries, we have to pass down the secondary
 321          * bucket bit here as well
 322          */
 323         return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
 324 }
 325
 326 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
 327
 328 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
 329 {
 330         unsigned long slot_offset;
 331         unsigned long lpar_rc;
 332         int i;
 333         unsigned long dummy1, dummy2;
 334
 335         /* pick a random slot to start at */
 336         slot_offset = mftb() & 0x7;
 337
 338         for (i = 0; i < HPTES_PER_GROUP; i++) {
 339
 340                 /* don't remove a bolted entry */
 341                 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
 342                                            (0x1UL << 4), &dummy1, &dummy2);
 343
 344                 if (lpar_rc == H_Success)
 345                         return i;
 346
 347                 BUG_ON(lpar_rc != H_Not_Found);
 348
 349                 slot_offset++;
 350                 slot_offset &= 0x7;
 351         }
 352
 353         return -1;
 354 }
 355
 356 static void pSeries_lpar_hptab_clear(void)
 357 {
 358         unsigned long size_bytes = 1UL << ppc64_pft_size;
 359         unsigned long hpte_count = size_bytes >> 4;
 360         unsigned long dummy1, dummy2;
 361         int i;
 362
 363         /* TODO: Use bulk call */
 364         for (i = 0; i < hpte_count; i++)
 365                 plpar_pte_remove(0, i, 0, &dummy1, &dummy2);
 366 }
 367
 368 /*
 369  * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
 370  * the low 3 bits of flags happen to line up.  So no transform is needed.
 371  * We can probably optimize here and assume the high bits of newpp are
 372  * already zero.  For now I am paranoid.
 373  */
 374 static long pSeries_lpar_hpte_updatepp(unsigned long slot, unsigned long newpp,
 375                                        unsigned long va, int large, int local)
 376 {
 377         unsigned long lpar_rc;
 378         unsigned long flags = (newpp & 7) | H_AVPN;
 379         unsigned long avpn = va >> 23;
 380
 381         if (large)
 382                 avpn &= ~0x1UL;
 383
 384         lpar_rc = plpar_pte_protect(flags, slot, (avpn << 7));
 385
 386         if (lpar_rc == H_Not_Found)
 387                 return -1;
 388
 389         BUG_ON(lpar_rc != H_Success);
 390
 391         return 0;
 392 }
 393
 394 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
 395 {
 396         unsigned long dword0;
 397         unsigned long lpar_rc;
 398         unsigned long dummy_word1;
 399         unsigned long flags;
 400
 401         /* Read 1 pte at a time                        */
 402         /* Do not need RPN to logical page translation */
 403         /* No cross CEC PFT access                     */
 404         flags = 0;
 405
 406         lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
 407
 408         BUG_ON(lpar_rc != H_Success);
 409
 410         return dword0;
 411 }
 412
 413 static long pSeries_lpar_hpte_find(unsigned long vpn)
 414 {
 415         unsigned long hash;
 416         unsigned long i, j;
 417         long slot;
 418         unsigned long hpte_v;
 419
 420         hash = hpt_hash(vpn, 0);
 421
 422         for (j = 0; j < 2; j++) {
 423                 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
 424                 for (i = 0; i < HPTES_PER_GROUP; i++) {
 425                         hpte_v = pSeries_lpar_hpte_getword0(slot);
 426
 427                         if ((HPTE_V_AVPN_VAL(hpte_v) == (vpn >> 11))
 428                             && (hpte_v & HPTE_V_VALID)
 429                             && (!!(hpte_v & HPTE_V_SECONDARY) == j)) {
 430                                 /* HPTE matches */
 431                                 if (j)
 432                                         slot = -slot;
 433                                 return slot;
 434                         }
 435                         ++slot;
 436                 }
 437                 hash = ~hash;
 438         }
 439
 440         return -1;
 441 }
 442
 443 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
 444                                              unsigned long ea)
 445 {
 446         unsigned long lpar_rc;
 447         unsigned long vsid, va, vpn, flags;
 448         long slot;
 449
 450         vsid = get_kernel_vsid(ea);
 451         va = (vsid << 28) | (ea & 0x0fffffff);
 452         vpn = va >> PAGE_SHIFT;
 453
 454         slot = pSeries_lpar_hpte_find(vpn);
 455         BUG_ON(slot == -1);
 456
 457         flags = newpp & 7;
 458         lpar_rc = plpar_pte_protect(flags, slot, 0);
 459
 460         BUG_ON(lpar_rc != H_Success);
 461 }
 462
 463 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
 464                                          int large, int local)
 465 {
 466         unsigned long avpn = va >> 23;
 467         unsigned long lpar_rc;
 468         unsigned long dummy1, dummy2;
 469
 470         if (large)
 471                 avpn &= ~0x1UL;
 472
 473         lpar_rc = plpar_pte_remove(H_AVPN, slot, (avpn << 7), &dummy1,
 474                                    &dummy2);
 475
 476         if (lpar_rc == H_Not_Found)
 477                 return;
 478
 479         BUG_ON(lpar_rc != H_Success);
 480 }
 481
 482 /*
 483  * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
 484  * lock.
 485  */
 486 void pSeries_lpar_flush_hash_range(unsigned long context, unsigned long number,
 487                                    int local)
 488 {
 489         int i;
 490         unsigned long flags = 0;
 491         struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
 492         int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE);
 493
 494         if (lock_tlbie)
 495                 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
 496
 497         for (i = 0; i < number; i++)
 498                 flush_hash_page(context, batch->addr[i], batch->pte[i], local);
 499
 500         if (lock_tlbie)
 501                 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
 502 }
 503
 504 void hpte_init_lpar(void)
 505 {
 506         ppc_md.hpte_invalidate  = pSeries_lpar_hpte_invalidate;
 507         ppc_md.hpte_updatepp    = pSeries_lpar_hpte_updatepp;
 508         ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
 509         ppc_md.hpte_insert      = pSeries_lpar_hpte_insert;
 510         ppc_md.hpte_remove      = pSeries_lpar_hpte_remove;
 511         ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
 512         ppc_md.hpte_clear_all   = pSeries_lpar_hptab_clear;
 513
 514         htab_finish_init();
 515 }