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 <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 42 #include "plpar_wrappers.h" 43 44 #ifdef DEBUG_LOW 45 #define DBG_LOW(fmt...) do { udbg_printf(fmt); } while(0) 46 #else 47 #define DBG_LOW(fmt...) do { } while(0) 48 #endif 49 50 /* in pSeries_hvCall.S */ 51 EXPORT_SYMBOL(plpar_hcall); 52 EXPORT_SYMBOL(plpar_hcall_4out); 53 EXPORT_SYMBOL(plpar_hcall_norets); 54 EXPORT_SYMBOL(plpar_hcall_8arg_2ret); 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(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 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 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 udbg_putc = udbg_putcLP; 232 udbg_getc = udbg_getcLP; 233 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 udbg_putc = udbg_hvsi_putc; 241 udbg_getc = udbg_hvsi_getc; 242 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 = __pa(&paca[cpu].lppaca); 265 long ret; 266 267 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 268 paca[cpu].lppaca.vmxregs_in_use = 1; 269 270 ret = register_vpa(hwcpu, 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, vpa, ret); 276 } 277 278 long pSeries_lpar_hpte_insert(unsigned long hpte_group, 279 unsigned long va, unsigned long pa, 280 unsigned long rflags, unsigned long vflags, 281 int psize) 282 { 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 if (!(vflags & HPTE_V_BOLTED)) 290 DBG_LOW("hpte_insert(group=%lx, va=%016lx, pa=%016lx, " 291 "rflags=%lx, vflags=%lx, psize=%d)\n", 292 hpte_group, va, pa, rflags, vflags, psize); 293 294 hpte_v = hpte_encode_v(va, psize) | vflags | HPTE_V_VALID; 295 hpte_r = hpte_encode_r(pa, psize) | rflags; 296 297 if (!(vflags & HPTE_V_BOLTED)) 298 DBG_LOW(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r); 299 300 #if 1 301 { 302 int i; 303 for (i=0;i<8;i++) { 304 unsigned long w0, w1; 305 plpar_pte_read(0, hpte_group, &w0, &w1); 306 BUG_ON (HPTE_V_COMPARE(hpte_v, w0) 307 && (w0 & HPTE_V_VALID)); 308 } 309 } 310 #endif 311 312 /* Now fill in the actual HPTE */ 313 /* Set CEC cookie to 0 */ 314 /* Zero page = 0 */ 315 /* I-cache Invalidate = 0 */ 316 /* I-cache synchronize = 0 */ 317 /* Exact = 0 */ 318 flags = 0; 319 320 /* Make pHyp happy */ 321 if (rflags & (_PAGE_GUARDED|_PAGE_NO_CACHE)) 322 hpte_r &= ~_PAGE_COHERENT; 323 324 lpar_rc = plpar_hcall(H_ENTER, flags, hpte_group, hpte_v, 325 hpte_r, &slot, &dummy0, &dummy1); 326 if (unlikely(lpar_rc == H_PTEG_Full)) { 327 if (!(vflags & HPTE_V_BOLTED)) 328 DBG_LOW(" full\n"); 329 return -1; 330 } 331 332 /* 333 * Since we try and ioremap PHBs we don't own, the pte insert 334 * will fail. However we must catch the failure in hash_page 335 * or we will loop forever, so return -2 in this case. 336 */ 337 if (unlikely(lpar_rc != H_Success)) { 338 if (!(vflags & HPTE_V_BOLTED)) 339 DBG_LOW(" lpar err %d\n", lpar_rc); 340 return -2; 341 } 342 if (!(vflags & HPTE_V_BOLTED)) 343 DBG_LOW(" -> slot: %d\n", slot & 7); 344 345 /* Because of iSeries, we have to pass down the secondary 346 * bucket bit here as well 347 */ 348 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3); 349 } 350 351 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock); 352 353 static long pSeries_lpar_hpte_remove(unsigned long hpte_group) 354 { 355 unsigned long slot_offset; 356 unsigned long lpar_rc; 357 int i; 358 unsigned long dummy1, dummy2; 359 360 /* pick a random slot to start at */ 361 slot_offset = mftb() & 0x7; 362 363 for (i = 0; i < HPTES_PER_GROUP; i++) { 364 365 /* don't remove a bolted entry */ 366 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset, 367 (0x1UL << 4), &dummy1, &dummy2); 368 if (lpar_rc == H_Success) 369 return i; 370 BUG_ON(lpar_rc != H_Not_Found); 371 372 slot_offset++; 373 slot_offset &= 0x7; 374 } 375 376 return -1; 377 } 378 379 static void pSeries_lpar_hptab_clear(void) 380 { 381 unsigned long size_bytes = 1UL << ppc64_pft_size; 382 unsigned long hpte_count = size_bytes >> 4; 383 unsigned long dummy1, dummy2; 384 int i; 385 386 /* TODO: Use bulk call */ 387 for (i = 0; i < hpte_count; i++) 388 plpar_pte_remove(0, i, 0, &dummy1, &dummy2); 389 } 390 391 /* 392 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and 393 * the low 3 bits of flags happen to line up. So no transform is needed. 394 * We can probably optimize here and assume the high bits of newpp are 395 * already zero. For now I am paranoid. 396 */ 397 static long pSeries_lpar_hpte_updatepp(unsigned long slot, 398 unsigned long newpp, 399 unsigned long va, 400 int psize, int local) 401 { 402 unsigned long lpar_rc; 403 unsigned long flags = (newpp & 7) | H_AVPN; 404 unsigned long want_v; 405 406 want_v = hpte_encode_v(va, psize); 407 408 DBG_LOW(" update: avpnv=%016lx, hash=%016lx, f=%x, psize: %d ... ", 409 want_v & HPTE_V_AVPN, slot, flags, psize); 410 411 lpar_rc = plpar_pte_protect(flags, slot, want_v & HPTE_V_AVPN); 412 413 if (lpar_rc == H_Not_Found) { 414 DBG_LOW("not found !\n"); 415 return -1; 416 } 417 418 DBG_LOW("ok\n"); 419 420 BUG_ON(lpar_rc != H_Success); 421 422 return 0; 423 } 424 425 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot) 426 { 427 unsigned long dword0; 428 unsigned long lpar_rc; 429 unsigned long dummy_word1; 430 unsigned long flags; 431 432 /* Read 1 pte at a time */ 433 /* Do not need RPN to logical page translation */ 434 /* No cross CEC PFT access */ 435 flags = 0; 436 437 lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1); 438 439 BUG_ON(lpar_rc != H_Success); 440 441 return dword0; 442 } 443 444 static long pSeries_lpar_hpte_find(unsigned long va, int psize) 445 { 446 unsigned long hash; 447 unsigned long i, j; 448 long slot; 449 unsigned long want_v, hpte_v; 450 451 hash = hpt_hash(va, mmu_psize_defs[psize].shift); 452 want_v = hpte_encode_v(va, psize); 453 454 for (j = 0; j < 2; j++) { 455 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 456 for (i = 0; i < HPTES_PER_GROUP; i++) { 457 hpte_v = pSeries_lpar_hpte_getword0(slot); 458 459 if (HPTE_V_COMPARE(hpte_v, want_v) 460 && (hpte_v & HPTE_V_VALID) 461 && (!!(hpte_v & HPTE_V_SECONDARY) == j)) { 462 /* HPTE matches */ 463 if (j) 464 slot = -slot; 465 return slot; 466 } 467 ++slot; 468 } 469 hash = ~hash; 470 } 471 472 return -1; 473 } 474 475 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp, 476 unsigned long ea, 477 int psize) 478 { 479 unsigned long lpar_rc, slot, vsid, va, flags; 480 481 vsid = get_kernel_vsid(ea); 482 va = (vsid << 28) | (ea & 0x0fffffff); 483 484 slot = pSeries_lpar_hpte_find(va, psize); 485 BUG_ON(slot == -1); 486 487 flags = newpp & 7; 488 lpar_rc = plpar_pte_protect(flags, slot, 0); 489 490 BUG_ON(lpar_rc != H_Success); 491 } 492 493 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va, 494 int psize, int local) 495 { 496 unsigned long want_v; 497 unsigned long lpar_rc; 498 unsigned long dummy1, dummy2; 499 500 DBG_LOW(" inval : slot=%lx, va=%016lx, psize: %d, local: %d", 501 slot, va, psize, local); 502 503 want_v = hpte_encode_v(va, psize); 504 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v & HPTE_V_AVPN, 505 &dummy1, &dummy2); 506 if (lpar_rc == H_Not_Found) 507 return; 508 509 BUG_ON(lpar_rc != H_Success); 510 } 511 512 /* 513 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie 514 * lock. 515 */ 516 void pSeries_lpar_flush_hash_range(unsigned long number, int local) 517 { 518 int i; 519 unsigned long flags = 0; 520 struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch); 521 int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE); 522 523 if (lock_tlbie) 524 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 525 526 for (i = 0; i < number; i++) 527 flush_hash_page(batch->vaddr[i], batch->pte[i], 528 batch->psize, local); 529 530 if (lock_tlbie) 531 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 532 } 533 534 void hpte_init_lpar(void) 535 { 536 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate; 537 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp; 538 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp; 539 ppc_md.hpte_insert = pSeries_lpar_hpte_insert; 540 ppc_md.hpte_remove = pSeries_lpar_hpte_remove; 541 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range; 542 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear; 543 544 htab_finish_init(); 545 } 546