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 char 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 char 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 } 527