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/config.h>
  25 #include <linux/kernel.h>
  26 #include <linux/dma-mapping.h>
  27 #include <linux/console.h>
  28 #include <asm/processor.h>
  29 #include <asm/mmu.h>
  30 #include <asm/page.h>
  31 #include <asm/pgtable.h>
  32 #include <asm/machdep.h>
  33 #include <asm/abs_addr.h>
  34 #include <asm/mmu_context.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/udbg.h>
  42 #include <asm/smp.h>
  43
  44 #include "plpar_wrappers.h"
  45
  46 #ifdef DEBUG_LOW
  47 #define DBG_LOW(fmt...) do { udbg_printf(fmt); } while(0)
  48 #else
  49 #define DBG_LOW(fmt...) do { } while(0)
  50 #endif
  51
  52 /* in pSeries_hvCall.S */
  53 EXPORT_SYMBOL(plpar_hcall);
  54 EXPORT_SYMBOL(plpar_hcall_4out);
  55 EXPORT_SYMBOL(plpar_hcall_norets);
  56 EXPORT_SYMBOL(plpar_hcall_8arg_2ret);
  57
  58 extern void pSeries_find_serial_port(void);
  59
  60
  61 int vtermno;    /* virtual terminal# for udbg  */
  62
  63 #define __ALIGNED__ __attribute__((__aligned__(sizeof(long))))
  64 static void udbg_hvsi_putc(char c)
  65 {
  66         /* packet's seqno isn't used anyways */
  67         uint8_t packet[] __ALIGNED__ = { 0xff, 5, 0, 0, c };
  68         int rc;
  69
  70         if (c == '\n')
  71                 udbg_hvsi_putc('\r');
  72
  73         do {
  74                 rc = plpar_put_term_char(vtermno, sizeof(packet), packet);
  75         } while (rc == H_Busy);
  76 }
  77
  78 static long hvsi_udbg_buf_len;
  79 static uint8_t hvsi_udbg_buf[256];
  80
  81 static int udbg_hvsi_getc_poll(void)
  82 {
  83         unsigned char ch;
  84         int rc, i;
  85
  86         if (hvsi_udbg_buf_len == 0) {
  87                 rc = plpar_get_term_char(vtermno, &hvsi_udbg_buf_len, hvsi_udbg_buf);
  88                 if (rc != H_Success || hvsi_udbg_buf[0] != 0xff) {
  89                         /* bad read or non-data packet */
  90                         hvsi_udbg_buf_len = 0;
  91                 } else {
  92                         /* remove the packet header */
  93                         for (i = 4; i < hvsi_udbg_buf_len; i++)
  94                                 hvsi_udbg_buf[i-4] = hvsi_udbg_buf[i];
  95                         hvsi_udbg_buf_len -= 4;
  96                 }
  97         }
  98
  99         if (hvsi_udbg_buf_len <= 0 || hvsi_udbg_buf_len > 256) {
 100                 /* no data ready */
 101                 hvsi_udbg_buf_len = 0;
 102                 return -1;
 103         }
 104
 105         ch = hvsi_udbg_buf[0];
 106         /* shift remaining data down */
 107         for (i = 1; i < hvsi_udbg_buf_len; i++) {
 108                 hvsi_udbg_buf[i-1] = hvsi_udbg_buf[i];
 109         }
 110         hvsi_udbg_buf_len--;
 111
 112         return ch;
 113 }
 114
 115 static int udbg_hvsi_getc(void)
 116 {
 117         int ch;
 118         for (;;) {
 119                 ch = udbg_hvsi_getc_poll();
 120                 if (ch == -1) {
 121                         /* This shouldn't be needed...but... */
 122                         volatile unsigned long delay;
 123                         for (delay=0; delay < 2000000; delay++)
 124                                 ;
 125                 } else {
 126                         return ch;
 127                 }
 128         }
 129 }
 130
 131 static void udbg_putcLP(char c)
 132 {
 133         char buf[16];
 134         unsigned long rc;
 135
 136         if (c == '\n')
 137                 udbg_putcLP('\r');
 138
 139         buf[0] = c;
 140         do {
 141                 rc = plpar_put_term_char(vtermno, 1, buf);
 142         } while(rc == H_Busy);
 143 }
 144
 145 /* Buffered chars getc */
 146 static long inbuflen;
 147 static long inbuf[2];   /* must be 2 longs */
 148
 149 static int udbg_getc_pollLP(void)
 150 {
 151         /* The interface is tricky because it may return up to 16 chars.
 152          * We save them statically for future calls to udbg_getc().
 153          */
 154         char ch, *buf = (char *)inbuf;
 155         int i;
 156         long rc;
 157         if (inbuflen == 0) {
 158                 /* get some more chars. */
 159                 inbuflen = 0;
 160                 rc = plpar_get_term_char(vtermno, &inbuflen, buf);
 161                 if (rc != H_Success)
 162                         inbuflen = 0;   /* otherwise inbuflen is garbage */
 163         }
 164         if (inbuflen <= 0 || inbuflen > 16) {
 165                 /* Catch error case as well as other oddities (corruption) */
 166                 inbuflen = 0;
 167                 return -1;
 168         }
 169         ch = buf[0];
 170         for (i = 1; i < inbuflen; i++)  /* shuffle them down. */
 171                 buf[i-1] = buf[i];
 172         inbuflen--;
 173         return ch;
 174 }
 175
 176 static int udbg_getcLP(void)
 177 {
 178         int ch;
 179         for (;;) {
 180                 ch = udbg_getc_pollLP();
 181                 if (ch == -1) {
 182                         /* This shouldn't be needed...but... */
 183                         volatile unsigned long delay;
 184                         for (delay=0; delay < 2000000; delay++)
 185                                 ;
 186                 } else {
 187                         return ch;
 188                 }
 189         }
 190 }
 191
 192 /* call this from early_init() for a working debug console on
 193  * vterm capable LPAR machines
 194  */
 195 void __init udbg_init_debug_lpar(void)
 196 {
 197         vtermno = 0;
 198         udbg_putc = udbg_putcLP;
 199         udbg_getc = udbg_getcLP;
 200         udbg_getc_poll = udbg_getc_pollLP;
 201 }
 202
 203 /* returns 0 if couldn't find or use /chosen/stdout as console */
 204 void __init find_udbg_vterm(void)
 205 {
 206         struct device_node *stdout_node;
 207         u32 *termno;
 208         char *name;
 209         int add_console;
 210
 211         /* find the boot console from /chosen/stdout */
 212         if (!of_chosen)
 213                 return;
 214         name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
 215         if (name == NULL)
 216                 return;
 217         stdout_node = of_find_node_by_path(name);
 218         if (!stdout_node)
 219                 return;
 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         /* The user has requested a console so this is already set up. */
 226         add_console = !strstr(cmd_line, "console=");
 227
 228         /* Check if it's a virtual terminal */
 229         if (strncmp(name, "vty", 3) != 0)
 230                 goto out;
 231         termno = (u32 *)get_property(stdout_node, "reg", NULL);
 232         if (termno == NULL)
 233                 goto out;
 234         vtermno = termno[0];
 235
 236         if (device_is_compatible(stdout_node, "hvterm1")) {
 237                 udbg_putc = udbg_putcLP;
 238                 udbg_getc = udbg_getcLP;
 239                 udbg_getc_poll = udbg_getc_pollLP;
 240                 if (add_console)
 241                         add_preferred_console("hvc", termno[0] & 0xff, NULL);
 242         } else if (device_is_compatible(stdout_node, "hvterm-protocol")) {
 243                 vtermno = termno[0];
 244                 udbg_putc = udbg_hvsi_putc;
 245                 udbg_getc = udbg_hvsi_getc;
 246                 udbg_getc_poll = udbg_hvsi_getc_poll;
 247                 if (add_console)
 248                         add_preferred_console("hvsi", termno[0] & 0xff, NULL);
 249         }
 250 out:
 251         of_node_put(stdout_node);
 252 }
 253
 254 void vpa_init(int cpu)
 255 {
 256         int hwcpu = get_hard_smp_processor_id(cpu);
 257         unsigned long vpa = __pa(&paca[cpu].lppaca);
 258         long ret;
 259
 260         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 261                 paca[cpu].lppaca.vmxregs_in_use = 1;
 262
 263         ret = register_vpa(hwcpu, vpa);
 264
 265         if (ret)
 266                 printk(KERN_ERR "WARNING: vpa_init: VPA registration for "
 267                                 "cpu %d (hw %d) of area %lx returns %ld\n",
 268                                 cpu, hwcpu, vpa, ret);
 269 }
 270
 271 long pSeries_lpar_hpte_insert(unsigned long hpte_group,
 272                               unsigned long va, unsigned long pa,
 273                               unsigned long rflags, unsigned long vflags,
 274                               int psize)
 275 {
 276         unsigned long lpar_rc;
 277         unsigned long flags;
 278         unsigned long slot;
 279         unsigned long hpte_v, hpte_r;
 280         unsigned long dummy0, dummy1;
 281
 282         if (!(vflags & HPTE_V_BOLTED))
 283                 DBG_LOW("hpte_insert(group=%lx, va=%016lx, pa=%016lx, "
 284                         "rflags=%lx, vflags=%lx, psize=%d)\n",
 285                 hpte_group, va, pa, rflags, vflags, psize);
 286
 287         hpte_v = hpte_encode_v(va, psize) | vflags | HPTE_V_VALID;
 288         hpte_r = hpte_encode_r(pa, psize) | rflags;
 289
 290         if (!(vflags & HPTE_V_BOLTED))
 291                 DBG_LOW(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
 292
 293         /* Now fill in the actual HPTE */
 294         /* Set CEC cookie to 0         */
 295         /* Zero page = 0               */
 296         /* I-cache Invalidate = 0      */
 297         /* I-cache synchronize = 0     */
 298         /* Exact = 0                   */
 299         flags = 0;
 300
 301         /* Make pHyp happy */
 302         if (rflags & (_PAGE_GUARDED|_PAGE_NO_CACHE))
 303                 hpte_r &= ~_PAGE_COHERENT;
 304
 305         lpar_rc = plpar_hcall(H_ENTER, flags, hpte_group, hpte_v,
 306                               hpte_r, &slot, &dummy0, &dummy1);
 307         if (unlikely(lpar_rc == H_PTEG_Full)) {
 308                 if (!(vflags & HPTE_V_BOLTED))
 309                         DBG_LOW(" full\n");
 310                 return -1;
 311         }
 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                 if (!(vflags & HPTE_V_BOLTED))
 320                         DBG_LOW(" lpar err %d\n", lpar_rc);
 321                 return -2;
 322         }
 323         if (!(vflags & HPTE_V_BOLTED))
 324                 DBG_LOW(" -> slot: %d\n", slot & 7);
 325
 326         /* Because of iSeries, we have to pass down the secondary
 327          * bucket bit here as well
 328          */
 329         return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
 330 }
 331
 332 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
 333
 334 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
 335 {
 336         unsigned long slot_offset;
 337         unsigned long lpar_rc;
 338         int i;
 339         unsigned long dummy1, dummy2;
 340
 341         /* pick a random slot to start at */
 342         slot_offset = mftb() & 0x7;
 343
 344         for (i = 0; i < HPTES_PER_GROUP; i++) {
 345
 346                 /* don't remove a bolted entry */
 347                 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
 348                                            (0x1UL << 4), &dummy1, &dummy2);
 349                 if (lpar_rc == H_Success)
 350                         return i;
 351                 BUG_ON(lpar_rc != H_Not_Found);
 352
 353                 slot_offset++;
 354                 slot_offset &= 0x7;
 355         }
 356
 357         return -1;
 358 }
 359
 360 static void pSeries_lpar_hptab_clear(void)
 361 {
 362         unsigned long size_bytes = 1UL << ppc64_pft_size;
 363         unsigned long hpte_count = size_bytes >> 4;
 364         unsigned long dummy1, dummy2;
 365         int i;
 366
 367         /* TODO: Use bulk call */
 368         for (i = 0; i < hpte_count; i++)
 369                 plpar_pte_remove(0, i, 0, &dummy1, &dummy2);
 370 }
 371
 372 /*
 373  * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
 374  * the low 3 bits of flags happen to line up.  So no transform is needed.
 375  * We can probably optimize here and assume the high bits of newpp are
 376  * already zero.  For now I am paranoid.
 377  */
 378 static long pSeries_lpar_hpte_updatepp(unsigned long slot,
 379                                        unsigned long newpp,
 380                                        unsigned long va,
 381                                        int psize, int local)
 382 {
 383         unsigned long lpar_rc;
 384         unsigned long flags = (newpp & 7) | H_AVPN;
 385         unsigned long want_v;
 386
 387         want_v = hpte_encode_v(va, psize);
 388
 389         DBG_LOW("    update: avpnv=%016lx, hash=%016lx, f=%x, psize: %d ... ",
 390                 want_v & HPTE_V_AVPN, slot, flags, psize);
 391
 392         lpar_rc = plpar_pte_protect(flags, slot, want_v & HPTE_V_AVPN);
 393
 394         if (lpar_rc == H_Not_Found) {
 395                 DBG_LOW("not found !\n");
 396                 return -1;
 397         }
 398
 399         DBG_LOW("ok\n");
 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 va, int psize)
 426 {
 427         unsigned long hash;
 428         unsigned long i, j;
 429         long slot;
 430         unsigned long want_v, hpte_v;
 431
 432         hash = hpt_hash(va, mmu_psize_defs[psize].shift);
 433         want_v = hpte_encode_v(va, psize);
 434
 435         for (j = 0; j < 2; j++) {
 436                 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
 437                 for (i = 0; i < HPTES_PER_GROUP; i++) {
 438                         hpte_v = pSeries_lpar_hpte_getword0(slot);
 439
 440                         if (HPTE_V_COMPARE(hpte_v, want_v)
 441                             && (hpte_v & HPTE_V_VALID)
 442                             && (!!(hpte_v & HPTE_V_SECONDARY) == j)) {
 443                                 /* HPTE matches */
 444                                 if (j)
 445                                         slot = -slot;
 446                                 return slot;
 447                         }
 448                         ++slot;
 449                 }
 450                 hash = ~hash;
 451         }
 452
 453         return -1;
 454 }
 455
 456 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
 457                                              unsigned long ea,
 458                                              int psize)
 459 {
 460         unsigned long lpar_rc, slot, vsid, va, flags;
 461
 462         vsid = get_kernel_vsid(ea);
 463         va = (vsid << 28) | (ea & 0x0fffffff);
 464
 465         slot = pSeries_lpar_hpte_find(va, psize);
 466         BUG_ON(slot == -1);
 467
 468         flags = newpp & 7;
 469         lpar_rc = plpar_pte_protect(flags, slot, 0);
 470
 471         BUG_ON(lpar_rc != H_Success);
 472 }
 473
 474 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
 475                                          int psize, int local)
 476 {
 477         unsigned long want_v;
 478         unsigned long lpar_rc;
 479         unsigned long dummy1, dummy2;
 480
 481         DBG_LOW("    inval : slot=%lx, va=%016lx, psize: %d, local: %d",
 482                 slot, va, psize, local);
 483
 484         want_v = hpte_encode_v(va, psize);
 485         lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v & HPTE_V_AVPN,
 486                                    &dummy1, &dummy2);
 487         if (lpar_rc == H_Not_Found)
 488                 return;
 489
 490         BUG_ON(lpar_rc != H_Success);
 491 }
 492
 493 /*
 494  * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
 495  * lock.
 496  */
 497 void pSeries_lpar_flush_hash_range(unsigned long number, int local)
 498 {
 499         int i;
 500         unsigned long flags = 0;
 501         struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
 502         int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE);
 503
 504         if (lock_tlbie)
 505                 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
 506
 507         for (i = 0; i < number; i++)
 508                 flush_hash_page(batch->vaddr[i], batch->pte[i],
 509                                 batch->psize, local);
 510
 511         if (lock_tlbie)
 512                 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
 513 }
 514
 515 void hpte_init_lpar(void)
 516 {
 517         ppc_md.hpte_invalidate  = pSeries_lpar_hpte_invalidate;
 518         ppc_md.hpte_updatepp    = pSeries_lpar_hpte_updatepp;
 519         ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
 520         ppc_md.hpte_insert      = pSeries_lpar_hpte_insert;
 521         ppc_md.hpte_remove      = pSeries_lpar_hpte_remove;
 522         ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
 523         ppc_md.hpte_clear_all   = pSeries_lpar_hptab_clear;
 524
 525         htab_finish_init();
 526 }