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/iommu.h> 35 #include <asm/tlbflush.h> 36 #include <asm/tlb.h> 37 #include <asm/prom.h> 38 #include <asm/abs_addr.h> 39 #include <asm/cputable.h> 40 #include <asm/udbg.h> 41 #include <asm/smp.h> 42 43 #include "plpar_wrappers.h" 44 45 #ifdef DEBUG_LOW 46 #define DBG_LOW(fmt...) do { udbg_printf(fmt); } while(0) 47 #else 48 #define DBG_LOW(fmt...) do { } while(0) 49 #endif 50 51 /* in pSeries_hvCall.S */ 52 EXPORT_SYMBOL(plpar_hcall); 53 EXPORT_SYMBOL(plpar_hcall_4out); 54 EXPORT_SYMBOL(plpar_hcall_norets); 55 EXPORT_SYMBOL(plpar_hcall_8arg_2ret); 56 57 extern void pSeries_find_serial_port(void); 58 59 60 int vtermno; /* virtual terminal# for udbg */ 61 62 #define __ALIGNED__ __attribute__((__aligned__(sizeof(long)))) 63 static void udbg_hvsi_putc(unsigned char c) 64 { 65 /* packet's seqno isn't used anyways */ 66 uint8_t packet[] __ALIGNED__ = { 0xff, 5, 0, 0, c }; 67 int rc; 68 69 if (c == '\n') 70 udbg_hvsi_putc('\r'); 71 72 do { 73 rc = plpar_put_term_char(vtermno, sizeof(packet), packet); 74 } while (rc == H_Busy); 75 } 76 77 static long hvsi_udbg_buf_len; 78 static uint8_t hvsi_udbg_buf[256]; 79 80 static int udbg_hvsi_getc_poll(void) 81 { 82 unsigned char ch; 83 int rc, i; 84 85 if (hvsi_udbg_buf_len == 0) { 86 rc = plpar_get_term_char(vtermno, &hvsi_udbg_buf_len, hvsi_udbg_buf); 87 if (rc != H_Success || hvsi_udbg_buf[0] != 0xff) { 88 /* bad read or non-data packet */ 89 hvsi_udbg_buf_len = 0; 90 } else { 91 /* remove the packet header */ 92 for (i = 4; i < hvsi_udbg_buf_len; i++) 93 hvsi_udbg_buf[i-4] = hvsi_udbg_buf[i]; 94 hvsi_udbg_buf_len -= 4; 95 } 96 } 97 98 if (hvsi_udbg_buf_len <= 0 || hvsi_udbg_buf_len > 256) { 99 /* no data ready */ 100 hvsi_udbg_buf_len = 0; 101 return -1; 102 } 103 104 ch = hvsi_udbg_buf[0]; 105 /* shift remaining data down */ 106 for (i = 1; i < hvsi_udbg_buf_len; i++) { 107 hvsi_udbg_buf[i-1] = hvsi_udbg_buf[i]; 108 } 109 hvsi_udbg_buf_len--; 110 111 return ch; 112 } 113 114 static unsigned char udbg_hvsi_getc(void) 115 { 116 int ch; 117 for (;;) { 118 ch = udbg_hvsi_getc_poll(); 119 if (ch == -1) { 120 /* This shouldn't be needed...but... */ 121 volatile unsigned long delay; 122 for (delay=0; delay < 2000000; delay++) 123 ; 124 } else { 125 return ch; 126 } 127 } 128 } 129 130 static void udbg_putcLP(unsigned char c) 131 { 132 char buf[16]; 133 unsigned long rc; 134 135 if (c == '\n') 136 udbg_putcLP('\r'); 137 138 buf[0] = c; 139 do { 140 rc = plpar_put_term_char(vtermno, 1, buf); 141 } while(rc == H_Busy); 142 } 143 144 /* Buffered chars getc */ 145 static long inbuflen; 146 static long inbuf[2]; /* must be 2 longs */ 147 148 static int udbg_getc_pollLP(void) 149 { 150 /* The interface is tricky because it may return up to 16 chars. 151 * We save them statically for future calls to udbg_getc(). 152 */ 153 char ch, *buf = (char *)inbuf; 154 int i; 155 long rc; 156 if (inbuflen == 0) { 157 /* get some more chars. */ 158 inbuflen = 0; 159 rc = plpar_get_term_char(vtermno, &inbuflen, buf); 160 if (rc != H_Success) 161 inbuflen = 0; /* otherwise inbuflen is garbage */ 162 } 163 if (inbuflen <= 0 || inbuflen > 16) { 164 /* Catch error case as well as other oddities (corruption) */ 165 inbuflen = 0; 166 return -1; 167 } 168 ch = buf[0]; 169 for (i = 1; i < inbuflen; i++) /* shuffle them down. */ 170 buf[i-1] = buf[i]; 171 inbuflen--; 172 return ch; 173 } 174 175 static unsigned char udbg_getcLP(void) 176 { 177 int ch; 178 for (;;) { 179 ch = udbg_getc_pollLP(); 180 if (ch == -1) { 181 /* This shouldn't be needed...but... */ 182 volatile unsigned long delay; 183 for (delay=0; delay < 2000000; delay++) 184 ; 185 } else { 186 return ch; 187 } 188 } 189 } 190 191 /* call this from early_init() for a working debug console on 192 * vterm capable LPAR machines 193 */ 194 void udbg_init_debug_lpar(void) 195 { 196 vtermno = 0; 197 udbg_putc = udbg_putcLP; 198 udbg_getc = udbg_getcLP; 199 udbg_getc_poll = udbg_getc_pollLP; 200 } 201 202 /* returns 0 if couldn't find or use /chosen/stdout as console */ 203 int find_udbg_vterm(void) 204 { 205 struct device_node *stdout_node; 206 u32 *termno; 207 char *name; 208 int found = 0; 209 210 /* find the boot console from /chosen/stdout */ 211 if (!of_chosen) 212 return 0; 213 name = (char *)get_property(of_chosen, "linux,stdout-path", NULL); 214 if (name == NULL) 215 return 0; 216 stdout_node = of_find_node_by_path(name); 217 if (!stdout_node) 218 return 0; 219 220 /* now we have the stdout node; figure out what type of device it is. */ 221 name = (char *)get_property(stdout_node, "name", NULL); 222 if (!name) { 223 printk(KERN_WARNING "stdout node missing 'name' property!\n"); 224 goto out; 225 } 226 227 if (strncmp(name, "vty", 3) == 0) { 228 if (device_is_compatible(stdout_node, "hvterm1")) { 229 termno = (u32 *)get_property(stdout_node, "reg", NULL); 230 if (termno) { 231 vtermno = termno[0]; 232 udbg_putc = udbg_putcLP; 233 udbg_getc = udbg_getcLP; 234 udbg_getc_poll = udbg_getc_pollLP; 235 found = 1; 236 } 237 } else if (device_is_compatible(stdout_node, "hvterm-protocol")) { 238 termno = (u32 *)get_property(stdout_node, "reg", NULL); 239 if (termno) { 240 vtermno = termno[0]; 241 udbg_putc = udbg_hvsi_putc; 242 udbg_getc = udbg_hvsi_getc; 243 udbg_getc_poll = udbg_hvsi_getc_poll; 244 found = 1; 245 } 246 } 247 } else if (strncmp(name, "serial", 6)) { 248 /* XXX fix ISA serial console */ 249 printk(KERN_WARNING "serial stdout on LPAR ('%s')! " 250 "can't print udbg messages\n", 251 stdout_node->full_name); 252 } else { 253 printk(KERN_WARNING "don't know how to print to stdout '%s'\n", 254 stdout_node->full_name); 255 } 256 257 out: 258 of_node_put(stdout_node); 259 return found; 260 } 261 262 void vpa_init(int cpu) 263 { 264 int hwcpu = get_hard_smp_processor_id(cpu); 265 unsigned long vpa = __pa(&paca[cpu].lppaca); 266 long ret; 267 268 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 269 paca[cpu].lppaca.vmxregs_in_use = 1; 270 271 ret = register_vpa(hwcpu, vpa); 272 273 if (ret) 274 printk(KERN_ERR "WARNING: vpa_init: VPA registration for " 275 "cpu %d (hw %d) of area %lx returns %ld\n", 276 cpu, hwcpu, vpa, ret); 277 } 278 279 long pSeries_lpar_hpte_insert(unsigned long hpte_group, 280 unsigned long va, unsigned long pa, 281 unsigned long rflags, unsigned long vflags, 282 int psize) 283 { 284 unsigned long lpar_rc; 285 unsigned long flags; 286 unsigned long slot; 287 unsigned long hpte_v, hpte_r; 288 unsigned long dummy0, dummy1; 289 290 if (!(vflags & HPTE_V_BOLTED)) 291 DBG_LOW("hpte_insert(group=%lx, va=%016lx, pa=%016lx, " 292 "rflags=%lx, vflags=%lx, psize=%d)\n", 293 hpte_group, va, pa, rflags, vflags, psize); 294 295 hpte_v = hpte_encode_v(va, psize) | vflags | HPTE_V_VALID; 296 hpte_r = hpte_encode_r(pa, psize) | rflags; 297 298 if (!(vflags & HPTE_V_BOLTED)) 299 DBG_LOW(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r); 300 301 /* Now fill in the actual HPTE */ 302 /* Set CEC cookie to 0 */ 303 /* Zero page = 0 */ 304 /* I-cache Invalidate = 0 */ 305 /* I-cache synchronize = 0 */ 306 /* Exact = 0 */ 307 flags = 0; 308 309 /* Make pHyp happy */ 310 if (rflags & (_PAGE_GUARDED|_PAGE_NO_CACHE)) 311 hpte_r &= ~_PAGE_COHERENT; 312 313 lpar_rc = plpar_hcall(H_ENTER, flags, hpte_group, hpte_v, 314 hpte_r, &slot, &dummy0, &dummy1); 315 if (unlikely(lpar_rc == H_PTEG_Full)) { 316 if (!(vflags & HPTE_V_BOLTED)) 317 DBG_LOW(" full\n"); 318 return -1; 319 } 320 321 /* 322 * Since we try and ioremap PHBs we don't own, the pte insert 323 * will fail. However we must catch the failure in hash_page 324 * or we will loop forever, so return -2 in this case. 325 */ 326 if (unlikely(lpar_rc != H_Success)) { 327 if (!(vflags & HPTE_V_BOLTED)) 328 DBG_LOW(" lpar err %d\n", lpar_rc); 329 return -2; 330 } 331 if (!(vflags & HPTE_V_BOLTED)) 332 DBG_LOW(" -> slot: %d\n", slot & 7); 333 334 /* Because of iSeries, we have to pass down the secondary 335 * bucket bit here as well 336 */ 337 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3); 338 } 339 340 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock); 341 342 static long pSeries_lpar_hpte_remove(unsigned long hpte_group) 343 { 344 unsigned long slot_offset; 345 unsigned long lpar_rc; 346 int i; 347 unsigned long dummy1, dummy2; 348 349 /* pick a random slot to start at */ 350 slot_offset = mftb() & 0x7; 351 352 for (i = 0; i < HPTES_PER_GROUP; i++) { 353 354 /* don't remove a bolted entry */ 355 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset, 356 (0x1UL << 4), &dummy1, &dummy2); 357 if (lpar_rc == H_Success) 358 return i; 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, 387 unsigned long newpp, 388 unsigned long va, 389 int psize, int local) 390 { 391 unsigned long lpar_rc; 392 unsigned long flags = (newpp & 7) | H_AVPN; 393 unsigned long want_v; 394 395 want_v = hpte_encode_v(va, psize); 396 397 DBG_LOW(" update: avpnv=%016lx, hash=%016lx, f=%x, psize: %d ... ", 398 want_v & HPTE_V_AVPN, slot, flags, psize); 399 400 lpar_rc = plpar_pte_protect(flags, slot, want_v & HPTE_V_AVPN); 401 402 if (lpar_rc == H_Not_Found) { 403 DBG_LOW("not found !\n"); 404 return -1; 405 } 406 407 DBG_LOW("ok\n"); 408 409 BUG_ON(lpar_rc != H_Success); 410 411 return 0; 412 } 413 414 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot) 415 { 416 unsigned long dword0; 417 unsigned long lpar_rc; 418 unsigned long dummy_word1; 419 unsigned long flags; 420 421 /* Read 1 pte at a time */ 422 /* Do not need RPN to logical page translation */ 423 /* No cross CEC PFT access */ 424 flags = 0; 425 426 lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1); 427 428 BUG_ON(lpar_rc != H_Success); 429 430 return dword0; 431 } 432 433 static long pSeries_lpar_hpte_find(unsigned long va, int psize) 434 { 435 unsigned long hash; 436 unsigned long i, j; 437 long slot; 438 unsigned long want_v, hpte_v; 439 440 hash = hpt_hash(va, mmu_psize_defs[psize].shift); 441 want_v = hpte_encode_v(va, psize); 442 443 for (j = 0; j < 2; j++) { 444 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 445 for (i = 0; i < HPTES_PER_GROUP; i++) { 446 hpte_v = pSeries_lpar_hpte_getword0(slot); 447 448 if (HPTE_V_COMPARE(hpte_v, want_v) 449 && (hpte_v & HPTE_V_VALID) 450 && (!!(hpte_v & HPTE_V_SECONDARY) == j)) { 451 /* HPTE matches */ 452 if (j) 453 slot = -slot; 454 return slot; 455 } 456 ++slot; 457 } 458 hash = ~hash; 459 } 460 461 return -1; 462 } 463 464 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp, 465 unsigned long ea, 466 int psize) 467 { 468 unsigned long lpar_rc, slot, vsid, va, flags; 469 470 vsid = get_kernel_vsid(ea); 471 va = (vsid << 28) | (ea & 0x0fffffff); 472 473 slot = pSeries_lpar_hpte_find(va, psize); 474 BUG_ON(slot == -1); 475 476 flags = newpp & 7; 477 lpar_rc = plpar_pte_protect(flags, slot, 0); 478 479 BUG_ON(lpar_rc != H_Success); 480 } 481 482 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va, 483 int psize, int local) 484 { 485 unsigned long want_v; 486 unsigned long lpar_rc; 487 unsigned long dummy1, dummy2; 488 489 DBG_LOW(" inval : slot=%lx, va=%016lx, psize: %d, local: %d", 490 slot, va, psize, local); 491 492 want_v = hpte_encode_v(va, psize); 493 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v & HPTE_V_AVPN, 494 &dummy1, &dummy2); 495 if (lpar_rc == H_Not_Found) 496 return; 497 498 BUG_ON(lpar_rc != H_Success); 499 } 500 501 /* 502 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie 503 * lock. 504 */ 505 void pSeries_lpar_flush_hash_range(unsigned long number, int local) 506 { 507 int i; 508 unsigned long flags = 0; 509 struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch); 510 int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE); 511 512 if (lock_tlbie) 513 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 514 515 for (i = 0; i < number; i++) 516 flush_hash_page(batch->vaddr[i], batch->pte[i], 517 batch->psize, local); 518 519 if (lock_tlbie) 520 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 521 } 522 523 void hpte_init_lpar(void) 524 { 525 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate; 526 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp; 527 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp; 528 ppc_md.hpte_insert = pSeries_lpar_hpte_insert; 529 ppc_md.hpte_remove = pSeries_lpar_hpte_remove; 530 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range; 531 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear; 532 533 htab_finish_init(); 534 } 535