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 EXPORT_SYMBOL(plpar_hcall_7arg_7ret); 58 EXPORT_SYMBOL(plpar_hcall_9arg_9ret); 59 extern void pSeries_find_serial_port(void); 60 61 62 int vtermno; /* virtual terminal# for udbg */ 63 64 #define __ALIGNED__ __attribute__((__aligned__(sizeof(long)))) 65 static void udbg_hvsi_putc(char c) 66 { 67 /* packet's seqno isn't used anyways */ 68 uint8_t packet[] __ALIGNED__ = { 0xff, 5, 0, 0, c }; 69 int rc; 70 71 if (c == '\n') 72 udbg_hvsi_putc('\r'); 73 74 do { 75 rc = plpar_put_term_char(vtermno, sizeof(packet), packet); 76 } while (rc == H_BUSY); 77 } 78 79 static long hvsi_udbg_buf_len; 80 static uint8_t hvsi_udbg_buf[256]; 81 82 static int udbg_hvsi_getc_poll(void) 83 { 84 unsigned char ch; 85 int rc, i; 86 87 if (hvsi_udbg_buf_len == 0) { 88 rc = plpar_get_term_char(vtermno, &hvsi_udbg_buf_len, hvsi_udbg_buf); 89 if (rc != H_SUCCESS || hvsi_udbg_buf[0] != 0xff) { 90 /* bad read or non-data packet */ 91 hvsi_udbg_buf_len = 0; 92 } else { 93 /* remove the packet header */ 94 for (i = 4; i < hvsi_udbg_buf_len; i++) 95 hvsi_udbg_buf[i-4] = hvsi_udbg_buf[i]; 96 hvsi_udbg_buf_len -= 4; 97 } 98 } 99 100 if (hvsi_udbg_buf_len <= 0 || hvsi_udbg_buf_len > 256) { 101 /* no data ready */ 102 hvsi_udbg_buf_len = 0; 103 return -1; 104 } 105 106 ch = hvsi_udbg_buf[0]; 107 /* shift remaining data down */ 108 for (i = 1; i < hvsi_udbg_buf_len; i++) { 109 hvsi_udbg_buf[i-1] = hvsi_udbg_buf[i]; 110 } 111 hvsi_udbg_buf_len--; 112 113 return ch; 114 } 115 116 static int udbg_hvsi_getc(void) 117 { 118 int ch; 119 for (;;) { 120 ch = udbg_hvsi_getc_poll(); 121 if (ch == -1) { 122 /* This shouldn't be needed...but... */ 123 volatile unsigned long delay; 124 for (delay=0; delay < 2000000; delay++) 125 ; 126 } else { 127 return ch; 128 } 129 } 130 } 131 132 static void udbg_putcLP(char c) 133 { 134 char buf[16]; 135 unsigned long rc; 136 137 if (c == '\n') 138 udbg_putcLP('\r'); 139 140 buf[0] = c; 141 do { 142 rc = plpar_put_term_char(vtermno, 1, buf); 143 } while(rc == H_BUSY); 144 } 145 146 /* Buffered chars getc */ 147 static long inbuflen; 148 static long inbuf[2]; /* must be 2 longs */ 149 150 static int udbg_getc_pollLP(void) 151 { 152 /* The interface is tricky because it may return up to 16 chars. 153 * We save them statically for future calls to udbg_getc(). 154 */ 155 char ch, *buf = (char *)inbuf; 156 int i; 157 long rc; 158 if (inbuflen == 0) { 159 /* get some more chars. */ 160 inbuflen = 0; 161 rc = plpar_get_term_char(vtermno, &inbuflen, buf); 162 if (rc != H_SUCCESS) 163 inbuflen = 0; /* otherwise inbuflen is garbage */ 164 } 165 if (inbuflen <= 0 || inbuflen > 16) { 166 /* Catch error case as well as other oddities (corruption) */ 167 inbuflen = 0; 168 return -1; 169 } 170 ch = buf[0]; 171 for (i = 1; i < inbuflen; i++) /* shuffle them down. */ 172 buf[i-1] = buf[i]; 173 inbuflen--; 174 return ch; 175 } 176 177 static int udbg_getcLP(void) 178 { 179 int ch; 180 for (;;) { 181 ch = udbg_getc_pollLP(); 182 if (ch == -1) { 183 /* This shouldn't be needed...but... */ 184 volatile unsigned long delay; 185 for (delay=0; delay < 2000000; delay++) 186 ; 187 } else { 188 return ch; 189 } 190 } 191 } 192 193 /* call this from early_init() for a working debug console on 194 * vterm capable LPAR machines 195 */ 196 void __init udbg_init_debug_lpar(void) 197 { 198 vtermno = 0; 199 udbg_putc = udbg_putcLP; 200 udbg_getc = udbg_getcLP; 201 udbg_getc_poll = udbg_getc_pollLP; 202 } 203 204 /* returns 0 if couldn't find or use /chosen/stdout as console */ 205 void __init find_udbg_vterm(void) 206 { 207 struct device_node *stdout_node; 208 u32 *termno; 209 char *name; 210 int add_console; 211 212 /* find the boot console from /chosen/stdout */ 213 if (!of_chosen) 214 return; 215 name = (char *)get_property(of_chosen, "linux,stdout-path", NULL); 216 if (name == NULL) 217 return; 218 stdout_node = of_find_node_by_path(name); 219 if (!stdout_node) 220 return; 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 /* The user has requested a console so this is already set up. */ 227 add_console = !strstr(cmd_line, "console="); 228 229 /* Check if it's a virtual terminal */ 230 if (strncmp(name, "vty", 3) != 0) 231 goto out; 232 termno = (u32 *)get_property(stdout_node, "reg", NULL); 233 if (termno == NULL) 234 goto out; 235 vtermno = termno[0]; 236 237 if (device_is_compatible(stdout_node, "hvterm1")) { 238 udbg_putc = udbg_putcLP; 239 udbg_getc = udbg_getcLP; 240 udbg_getc_poll = udbg_getc_pollLP; 241 if (add_console) 242 add_preferred_console("hvc", termno[0] & 0xff, NULL); 243 } else if (device_is_compatible(stdout_node, "hvterm-protocol")) { 244 vtermno = termno[0]; 245 udbg_putc = udbg_hvsi_putc; 246 udbg_getc = udbg_hvsi_getc; 247 udbg_getc_poll = udbg_hvsi_getc_poll; 248 if (add_console) 249 add_preferred_console("hvsi", termno[0] & 0xff, NULL); 250 } 251 out: 252 of_node_put(stdout_node); 253 } 254 255 void vpa_init(int cpu) 256 { 257 int hwcpu = get_hard_smp_processor_id(cpu); 258 unsigned long vpa = __pa(&lppaca[cpu]); 259 long ret; 260 261 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 262 lppaca[cpu].vmxregs_in_use = 1; 263 264 ret = register_vpa(hwcpu, vpa); 265 266 if (ret) 267 printk(KERN_ERR "WARNING: vpa_init: VPA registration for " 268 "cpu %d (hw %d) of area %lx returns %ld\n", 269 cpu, hwcpu, vpa, ret); 270 } 271 272 long pSeries_lpar_hpte_insert(unsigned long hpte_group, 273 unsigned long va, unsigned long pa, 274 unsigned long rflags, unsigned long vflags, 275 int psize) 276 { 277 unsigned long lpar_rc; 278 unsigned long flags; 279 unsigned long slot; 280 unsigned long hpte_v, hpte_r; 281 unsigned long dummy0, dummy1; 282 283 if (!(vflags & HPTE_V_BOLTED)) 284 DBG_LOW("hpte_insert(group=%lx, va=%016lx, pa=%016lx, " 285 "rflags=%lx, vflags=%lx, psize=%d)\n", 286 hpte_group, va, pa, rflags, vflags, psize); 287 288 hpte_v = hpte_encode_v(va, psize) | vflags | HPTE_V_VALID; 289 hpte_r = hpte_encode_r(pa, psize) | rflags; 290 291 if (!(vflags & HPTE_V_BOLTED)) 292 DBG_LOW(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r); 293 294 /* Now fill in the actual HPTE */ 295 /* Set CEC cookie to 0 */ 296 /* Zero page = 0 */ 297 /* I-cache Invalidate = 0 */ 298 /* I-cache synchronize = 0 */ 299 /* Exact = 0 */ 300 flags = 0; 301 302 /* Make pHyp happy */ 303 if (rflags & (_PAGE_GUARDED|_PAGE_NO_CACHE)) 304 hpte_r &= ~_PAGE_COHERENT; 305 306 lpar_rc = plpar_hcall(H_ENTER, flags, hpte_group, hpte_v, 307 hpte_r, &slot, &dummy0, &dummy1); 308 if (unlikely(lpar_rc == H_PTEG_FULL)) { 309 if (!(vflags & HPTE_V_BOLTED)) 310 DBG_LOW(" full\n"); 311 return -1; 312 } 313 314 /* 315 * Since we try and ioremap PHBs we don't own, the pte insert 316 * will fail. However we must catch the failure in hash_page 317 * or we will loop forever, so return -2 in this case. 318 */ 319 if (unlikely(lpar_rc != H_SUCCESS)) { 320 if (!(vflags & HPTE_V_BOLTED)) 321 DBG_LOW(" lpar err %d\n", lpar_rc); 322 return -2; 323 } 324 if (!(vflags & HPTE_V_BOLTED)) 325 DBG_LOW(" -> slot: %d\n", slot & 7); 326 327 /* Because of iSeries, we have to pass down the secondary 328 * bucket bit here as well 329 */ 330 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3); 331 } 332 333 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock); 334 335 static long pSeries_lpar_hpte_remove(unsigned long hpte_group) 336 { 337 unsigned long slot_offset; 338 unsigned long lpar_rc; 339 int i; 340 unsigned long dummy1, dummy2; 341 342 /* pick a random slot to start at */ 343 slot_offset = mftb() & 0x7; 344 345 for (i = 0; i < HPTES_PER_GROUP; i++) { 346 347 /* don't remove a bolted entry */ 348 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset, 349 (0x1UL << 4), &dummy1, &dummy2); 350 if (lpar_rc == H_SUCCESS) 351 return i; 352 BUG_ON(lpar_rc != H_NOT_FOUND); 353 354 slot_offset++; 355 slot_offset &= 0x7; 356 } 357 358 return -1; 359 } 360 361 static void pSeries_lpar_hptab_clear(void) 362 { 363 unsigned long size_bytes = 1UL << ppc64_pft_size; 364 unsigned long hpte_count = size_bytes >> 4; 365 unsigned long dummy1, dummy2; 366 int i; 367 368 /* TODO: Use bulk call */ 369 for (i = 0; i < hpte_count; i++) 370 plpar_pte_remove(0, i, 0, &dummy1, &dummy2); 371 } 372 373 /* 374 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and 375 * the low 3 bits of flags happen to line up. So no transform is needed. 376 * We can probably optimize here and assume the high bits of newpp are 377 * already zero. For now I am paranoid. 378 */ 379 static long pSeries_lpar_hpte_updatepp(unsigned long slot, 380 unsigned long newpp, 381 unsigned long va, 382 int psize, int local) 383 { 384 unsigned long lpar_rc; 385 unsigned long flags = (newpp & 7) | H_AVPN; 386 unsigned long want_v; 387 388 want_v = hpte_encode_v(va, psize); 389 390 DBG_LOW(" update: avpnv=%016lx, hash=%016lx, f=%x, psize: %d ... ", 391 want_v & HPTE_V_AVPN, slot, flags, psize); 392 393 lpar_rc = plpar_pte_protect(flags, slot, want_v & HPTE_V_AVPN); 394 395 if (lpar_rc == H_NOT_FOUND) { 396 DBG_LOW("not found !\n"); 397 return -1; 398 } 399 400 DBG_LOW("ok\n"); 401 402 BUG_ON(lpar_rc != H_SUCCESS); 403 404 return 0; 405 } 406 407 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot) 408 { 409 unsigned long dword0; 410 unsigned long lpar_rc; 411 unsigned long dummy_word1; 412 unsigned long flags; 413 414 /* Read 1 pte at a time */ 415 /* Do not need RPN to logical page translation */ 416 /* No cross CEC PFT access */ 417 flags = 0; 418 419 lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1); 420 421 BUG_ON(lpar_rc != H_SUCCESS); 422 423 return dword0; 424 } 425 426 static long pSeries_lpar_hpte_find(unsigned long va, int psize) 427 { 428 unsigned long hash; 429 unsigned long i, j; 430 long slot; 431 unsigned long want_v, hpte_v; 432 433 hash = hpt_hash(va, mmu_psize_defs[psize].shift); 434 want_v = hpte_encode_v(va, psize); 435 436 for (j = 0; j < 2; j++) { 437 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 438 for (i = 0; i < HPTES_PER_GROUP; i++) { 439 hpte_v = pSeries_lpar_hpte_getword0(slot); 440 441 if (HPTE_V_COMPARE(hpte_v, want_v) 442 && (hpte_v & HPTE_V_VALID) 443 && (!!(hpte_v & HPTE_V_SECONDARY) == j)) { 444 /* HPTE matches */ 445 if (j) 446 slot = -slot; 447 return slot; 448 } 449 ++slot; 450 } 451 hash = ~hash; 452 } 453 454 return -1; 455 } 456 457 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp, 458 unsigned long ea, 459 int psize) 460 { 461 unsigned long lpar_rc, slot, vsid, va, flags; 462 463 vsid = get_kernel_vsid(ea); 464 va = (vsid << 28) | (ea & 0x0fffffff); 465 466 slot = pSeries_lpar_hpte_find(va, psize); 467 BUG_ON(slot == -1); 468 469 flags = newpp & 7; 470 lpar_rc = plpar_pte_protect(flags, slot, 0); 471 472 BUG_ON(lpar_rc != H_SUCCESS); 473 } 474 475 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va, 476 int psize, int local) 477 { 478 unsigned long want_v; 479 unsigned long lpar_rc; 480 unsigned long dummy1, dummy2; 481 482 DBG_LOW(" inval : slot=%lx, va=%016lx, psize: %d, local: %d", 483 slot, va, psize, local); 484 485 want_v = hpte_encode_v(va, psize); 486 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v & HPTE_V_AVPN, 487 &dummy1, &dummy2); 488 if (lpar_rc == H_NOT_FOUND) 489 return; 490 491 BUG_ON(lpar_rc != H_SUCCESS); 492 } 493 494 /* 495 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie 496 * lock. 497 */ 498 void pSeries_lpar_flush_hash_range(unsigned long number, int local) 499 { 500 int i; 501 unsigned long flags = 0; 502 struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch); 503 int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE); 504 505 if (lock_tlbie) 506 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 507 508 for (i = 0; i < number; i++) 509 flush_hash_page(batch->vaddr[i], batch->pte[i], 510 batch->psize, local); 511 512 if (lock_tlbie) 513 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 514 } 515 516 void hpte_init_lpar(void) 517 { 518 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate; 519 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp; 520 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp; 521 ppc_md.hpte_insert = pSeries_lpar_hpte_insert; 522 ppc_md.hpte_remove = pSeries_lpar_hpte_remove; 523 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range; 524 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear; 525 526 htab_finish_init(); 527 } 528