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                               unsigned long vflags, unsigned long rflags)
 281 {
 282         unsigned long arpn = physRpn_to_absRpn(prpn);
 283         unsigned long lpar_rc;
 284         unsigned long flags;
 285         unsigned long slot;
 286         unsigned long hpte_v, hpte_r;
 287         unsigned long dummy0, dummy1;
 288
 289         hpte_v = ((va >> 23) << HPTE_V_AVPN_SHIFT) | vflags | HPTE_V_VALID;
 290         if (vflags & HPTE_V_LARGE)
 291                 hpte_v &= ~(1UL << HPTE_V_AVPN_SHIFT);
 292
 293         hpte_r = (arpn << HPTE_R_RPN_SHIFT) | rflags;
 294
 295         /* Now fill in the actual HPTE */
 296         /* Set CEC cookie to 0         */
 297         /* Zero page = 0               */
 298         /* I-cache Invalidate = 0      */
 299         /* I-cache synchronize = 0     */
 300         /* Exact = 0                   */
 301         flags = 0;
 302
 303         /* XXX why is this here? - Anton */
 304         if (rflags & (_PAGE_GUARDED|_PAGE_NO_CACHE))
 305                 hpte_r &= ~_PAGE_COHERENT;
 306
 307         lpar_rc = plpar_hcall(H_ENTER, flags, hpte_group, hpte_v,
 308                               hpte_r, &slot, &dummy0, &dummy1);
 309
 310         if (unlikely(lpar_rc == H_PTEG_Full))
 311                 return -1;
 312
 313         /*
 314          * Since we try and ioremap PHBs we don't own, the pte insert
 315          * will fail. However we must catch the failure in hash_page
 316          * or we will loop forever, so return -2 in this case.
 317          */
 318         if (unlikely(lpar_rc != H_Success))
 319                 return -2;
 320
 321         /* Because of iSeries, we have to pass down the secondary
 322          * bucket bit here as well
 323          */
 324         return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
 325 }
 326
 327 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
 328
 329 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
 330 {
 331         unsigned long slot_offset;
 332         unsigned long lpar_rc;
 333         int i;
 334         unsigned long dummy1, dummy2;
 335
 336         /* pick a random slot to start at */
 337         slot_offset = mftb() & 0x7;
 338
 339         for (i = 0; i < HPTES_PER_GROUP; i++) {
 340
 341                 /* don't remove a bolted entry */
 342                 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
 343                                            (0x1UL << 4), &dummy1, &dummy2);
 344
 345                 if (lpar_rc == H_Success)
 346                         return i;
 347
 348                 BUG_ON(lpar_rc != H_Not_Found);
 349
 350                 slot_offset++;
 351                 slot_offset &= 0x7;
 352         }
 353
 354         return -1;
 355 }
 356
 357 static void pSeries_lpar_hptab_clear(void)
 358 {
 359         unsigned long size_bytes = 1UL << ppc64_pft_size;
 360         unsigned long hpte_count = size_bytes >> 4;
 361         unsigned long dummy1, dummy2;
 362         int i;
 363
 364         /* TODO: Use bulk call */
 365         for (i = 0; i < hpte_count; i++)
 366                 plpar_pte_remove(0, i, 0, &dummy1, &dummy2);
 367 }
 368
 369 /*
 370  * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
 371  * the low 3 bits of flags happen to line up.  So no transform is needed.
 372  * We can probably optimize here and assume the high bits of newpp are
 373  * already zero.  For now I am paranoid.
 374  */
 375 static long pSeries_lpar_hpte_updatepp(unsigned long slot, unsigned long newpp,
 376                                        unsigned long va, int large, int local)
 377 {
 378         unsigned long lpar_rc;
 379         unsigned long flags = (newpp & 7) | H_AVPN;
 380         unsigned long avpn = va >> 23;
 381
 382         if (large)
 383                 avpn &= ~0x1UL;
 384
 385         lpar_rc = plpar_pte_protect(flags, slot, (avpn << 7));
 386
 387         if (lpar_rc == H_Not_Found)
 388                 return -1;
 389
 390         BUG_ON(lpar_rc != H_Success);
 391
 392         return 0;
 393 }
 394
 395 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
 396 {
 397         unsigned long dword0;
 398         unsigned long lpar_rc;
 399         unsigned long dummy_word1;
 400         unsigned long flags;
 401
 402         /* Read 1 pte at a time                        */
 403         /* Do not need RPN to logical page translation */
 404         /* No cross CEC PFT access                     */
 405         flags = 0;
 406
 407         lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
 408
 409         BUG_ON(lpar_rc != H_Success);
 410
 411         return dword0;
 412 }
 413
 414 static long pSeries_lpar_hpte_find(unsigned long vpn)
 415 {
 416         unsigned long hash;
 417         unsigned long i, j;
 418         long slot;
 419         unsigned long hpte_v;
 420
 421         hash = hpt_hash(vpn, 0);
 422
 423         for (j = 0; j < 2; j++) {
 424                 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
 425                 for (i = 0; i < HPTES_PER_GROUP; i++) {
 426                         hpte_v = pSeries_lpar_hpte_getword0(slot);
 427
 428                         if ((HPTE_V_AVPN_VAL(hpte_v) == (vpn >> 11))
 429                             && (hpte_v & HPTE_V_VALID)
 430                             && (!!(hpte_v & HPTE_V_SECONDARY) == j)) {
 431                                 /* HPTE matches */
 432                                 if (j)
 433                                         slot = -slot;
 434                                 return slot;
 435                         }
 436                         ++slot;
 437                 }
 438                 hash = ~hash;
 439         }
 440
 441         return -1;
 442 }
 443
 444 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
 445                                              unsigned long ea)
 446 {
 447         unsigned long lpar_rc;
 448         unsigned long vsid, va, vpn, flags;
 449         long slot;
 450
 451         vsid = get_kernel_vsid(ea);
 452         va = (vsid << 28) | (ea & 0x0fffffff);
 453         vpn = va >> PAGE_SHIFT;
 454
 455         slot = pSeries_lpar_hpte_find(vpn);
 456         BUG_ON(slot == -1);
 457
 458         flags = newpp & 7;
 459         lpar_rc = plpar_pte_protect(flags, slot, 0);
 460
 461         BUG_ON(lpar_rc != H_Success);
 462 }
 463
 464 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
 465                                          int large, int local)
 466 {
 467         unsigned long avpn = va >> 23;
 468         unsigned long lpar_rc;
 469         unsigned long dummy1, dummy2;
 470
 471         if (large)
 472                 avpn &= ~0x1UL;
 473
 474         lpar_rc = plpar_pte_remove(H_AVPN, slot, (avpn << 7), &dummy1,
 475                                    &dummy2);
 476
 477         if (lpar_rc == H_Not_Found)
 478                 return;
 479
 480         BUG_ON(lpar_rc != H_Success);
 481 }
 482
 483 /*
 484  * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
 485  * lock.
 486  */
 487 void pSeries_lpar_flush_hash_range(unsigned long context, unsigned long number,
 488                                    int local)
 489 {
 490         int i;
 491         unsigned long flags = 0;
 492         struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
 493         int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE);
 494
 495         if (lock_tlbie)
 496                 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
 497
 498         for (i = 0; i < number; i++)
 499                 flush_hash_page(context, batch->addr[i], batch->pte[i], local);
 500
 501         if (lock_tlbie)
 502                 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
 503 }
 504
 505 void hpte_init_lpar(void)
 506 {
 507         ppc_md.hpte_invalidate  = pSeries_lpar_hpte_invalidate;
 508         ppc_md.hpte_updatepp    = pSeries_lpar_hpte_updatepp;
 509         ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
 510         ppc_md.hpte_insert      = pSeries_lpar_hpte_insert;
 511         ppc_md.hpte_remove      = pSeries_lpar_hpte_remove;
 512         ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
 513         ppc_md.hpte_clear_all   = pSeries_lpar_hptab_clear;
 514
 515         htab_finish_init();
 516 }