1 /* 2 * (c) 2003-2010 Advanced Micro Devices, Inc. 3 * Your use of this code is subject to the terms and conditions of the 4 * GNU general public license version 2. See "COPYING" or 5 * http://www.gnu.org/licenses/gpl.html 6 * 7 * Support : mark.langsdorf@amd.com 8 * 9 * Based on the powernow-k7.c module written by Dave Jones. 10 * (C) 2003 Dave Jones on behalf of SuSE Labs 11 * (C) 2004 Dominik Brodowski <linux@brodo.de> 12 * (C) 2004 Pavel Machek <pavel@ucw.cz> 13 * Licensed under the terms of the GNU GPL License version 2. 14 * Based upon datasheets & sample CPUs kindly provided by AMD. 15 * 16 * Valuable input gratefully received from Dave Jones, Pavel Machek, 17 * Dominik Brodowski, Jacob Shin, and others. 18 * Originally developed by Paul Devriendt. 19 * Processor information obtained from Chapter 9 (Power and Thermal Management) 20 * of the "BIOS and Kernel Developer's Guide for the AMD Athlon 64 and AMD 21 * Opteron Processors" available for download from www.amd.com 22 * 23 * Tables for specific CPUs can be inferred from 24 * http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/30430.pdf 25 */ 26 27 #include <linux/kernel.h> 28 #include <linux/smp.h> 29 #include <linux/module.h> 30 #include <linux/init.h> 31 #include <linux/cpufreq.h> 32 #include <linux/slab.h> 33 #include <linux/string.h> 34 #include <linux/cpumask.h> 35 #include <linux/sched.h> /* for current / set_cpus_allowed() */ 36 #include <linux/io.h> 37 #include <linux/delay.h> 38 39 #include <asm/msr.h> 40 41 #include <linux/acpi.h> 42 #include <linux/mutex.h> 43 #include <acpi/processor.h> 44 45 #define PFX "powernow-k8: " 46 #define VERSION "version 2.20.00" 47 #include "powernow-k8.h" 48 #include "mperf.h" 49 50 /* serialize freq changes */ 51 static DEFINE_MUTEX(fidvid_mutex); 52 53 static DEFINE_PER_CPU(struct powernow_k8_data *, powernow_data); 54 55 static int cpu_family = CPU_OPTERON; 56 57 /* core performance boost */ 58 static bool cpb_capable, cpb_enabled; 59 static struct msr __percpu *msrs; 60 61 static struct cpufreq_driver cpufreq_amd64_driver; 62 63 #ifndef CONFIG_SMP 64 static inline const struct cpumask *cpu_core_mask(int cpu) 65 { 66 return cpumask_of(0); 67 } 68 #endif 69 70 /* Return a frequency in MHz, given an input fid */ 71 static u32 find_freq_from_fid(u32 fid) 72 { 73 return 800 + (fid * 100); 74 } 75 76 /* Return a frequency in KHz, given an input fid */ 77 static u32 find_khz_freq_from_fid(u32 fid) 78 { 79 return 1000 * find_freq_from_fid(fid); 80 } 81 82 static u32 find_khz_freq_from_pstate(struct cpufreq_frequency_table *data, 83 u32 pstate) 84 { 85 return data[pstate].frequency; 86 } 87 88 /* Return the vco fid for an input fid 89 * 90 * Each "low" fid has corresponding "high" fid, and you can get to "low" fids 91 * only from corresponding high fids. This returns "high" fid corresponding to 92 * "low" one. 93 */ 94 static u32 convert_fid_to_vco_fid(u32 fid) 95 { 96 if (fid < HI_FID_TABLE_BOTTOM) 97 return 8 + (2 * fid); 98 else 99 return fid; 100 } 101 102 /* 103 * Return 1 if the pending bit is set. Unless we just instructed the processor 104 * to transition to a new state, seeing this bit set is really bad news. 105 */ 106 static int pending_bit_stuck(void) 107 { 108 u32 lo, hi; 109 110 if (cpu_family == CPU_HW_PSTATE) 111 return 0; 112 113 rdmsr(MSR_FIDVID_STATUS, lo, hi); 114 return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0; 115 } 116 117 /* 118 * Update the global current fid / vid values from the status msr. 119 * Returns 1 on error. 120 */ 121 static int query_current_values_with_pending_wait(struct powernow_k8_data *data) 122 { 123 u32 lo, hi; 124 u32 i = 0; 125 126 if (cpu_family == CPU_HW_PSTATE) { 127 rdmsr(MSR_PSTATE_STATUS, lo, hi); 128 i = lo & HW_PSTATE_MASK; 129 data->currpstate = i; 130 131 /* 132 * a workaround for family 11h erratum 311 might cause 133 * an "out-of-range Pstate if the core is in Pstate-0 134 */ 135 if ((boot_cpu_data.x86 == 0x11) && (i >= data->numps)) 136 data->currpstate = HW_PSTATE_0; 137 138 return 0; 139 } 140 do { 141 if (i++ > 10000) { 142 pr_debug("detected change pending stuck\n"); 143 return 1; 144 } 145 rdmsr(MSR_FIDVID_STATUS, lo, hi); 146 } while (lo & MSR_S_LO_CHANGE_PENDING); 147 148 data->currvid = hi & MSR_S_HI_CURRENT_VID; 149 data->currfid = lo & MSR_S_LO_CURRENT_FID; 150 151 return 0; 152 } 153 154 /* the isochronous relief time */ 155 static void count_off_irt(struct powernow_k8_data *data) 156 { 157 udelay((1 << data->irt) * 10); 158 return; 159 } 160 161 /* the voltage stabilization time */ 162 static void count_off_vst(struct powernow_k8_data *data) 163 { 164 udelay(data->vstable * VST_UNITS_20US); 165 return; 166 } 167 168 /* need to init the control msr to a safe value (for each cpu) */ 169 static void fidvid_msr_init(void) 170 { 171 u32 lo, hi; 172 u8 fid, vid; 173 174 rdmsr(MSR_FIDVID_STATUS, lo, hi); 175 vid = hi & MSR_S_HI_CURRENT_VID; 176 fid = lo & MSR_S_LO_CURRENT_FID; 177 lo = fid | (vid << MSR_C_LO_VID_SHIFT); 178 hi = MSR_C_HI_STP_GNT_BENIGN; 179 pr_debug("cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo, hi); 180 wrmsr(MSR_FIDVID_CTL, lo, hi); 181 } 182 183 /* write the new fid value along with the other control fields to the msr */ 184 static int write_new_fid(struct powernow_k8_data *data, u32 fid) 185 { 186 u32 lo; 187 u32 savevid = data->currvid; 188 u32 i = 0; 189 190 if ((fid & INVALID_FID_MASK) || (data->currvid & INVALID_VID_MASK)) { 191 printk(KERN_ERR PFX "internal error - overflow on fid write\n"); 192 return 1; 193 } 194 195 lo = fid; 196 lo |= (data->currvid << MSR_C_LO_VID_SHIFT); 197 lo |= MSR_C_LO_INIT_FID_VID; 198 199 pr_debug("writing fid 0x%x, lo 0x%x, hi 0x%x\n", 200 fid, lo, data->plllock * PLL_LOCK_CONVERSION); 201 202 do { 203 wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION); 204 if (i++ > 100) { 205 printk(KERN_ERR PFX 206 "Hardware error - pending bit very stuck - " 207 "no further pstate changes possible\n"); 208 return 1; 209 } 210 } while (query_current_values_with_pending_wait(data)); 211 212 count_off_irt(data); 213 214 if (savevid != data->currvid) { 215 printk(KERN_ERR PFX 216 "vid change on fid trans, old 0x%x, new 0x%x\n", 217 savevid, data->currvid); 218 return 1; 219 } 220 221 if (fid != data->currfid) { 222 printk(KERN_ERR PFX 223 "fid trans failed, fid 0x%x, curr 0x%x\n", fid, 224 data->currfid); 225 return 1; 226 } 227 228 return 0; 229 } 230 231 /* Write a new vid to the hardware */ 232 static int write_new_vid(struct powernow_k8_data *data, u32 vid) 233 { 234 u32 lo; 235 u32 savefid = data->currfid; 236 int i = 0; 237 238 if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) { 239 printk(KERN_ERR PFX "internal error - overflow on vid write\n"); 240 return 1; 241 } 242 243 lo = data->currfid; 244 lo |= (vid << MSR_C_LO_VID_SHIFT); 245 lo |= MSR_C_LO_INIT_FID_VID; 246 247 pr_debug("writing vid 0x%x, lo 0x%x, hi 0x%x\n", 248 vid, lo, STOP_GRANT_5NS); 249 250 do { 251 wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS); 252 if (i++ > 100) { 253 printk(KERN_ERR PFX "internal error - pending bit " 254 "very stuck - no further pstate " 255 "changes possible\n"); 256 return 1; 257 } 258 } while (query_current_values_with_pending_wait(data)); 259 260 if (savefid != data->currfid) { 261 printk(KERN_ERR PFX "fid changed on vid trans, old " 262 "0x%x new 0x%x\n", 263 savefid, data->currfid); 264 return 1; 265 } 266 267 if (vid != data->currvid) { 268 printk(KERN_ERR PFX "vid trans failed, vid 0x%x, " 269 "curr 0x%x\n", 270 vid, data->currvid); 271 return 1; 272 } 273 274 return 0; 275 } 276 277 /* 278 * Reduce the vid by the max of step or reqvid. 279 * Decreasing vid codes represent increasing voltages: 280 * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of VID_OFF is off. 281 */ 282 static int decrease_vid_code_by_step(struct powernow_k8_data *data, 283 u32 reqvid, u32 step) 284 { 285 if ((data->currvid - reqvid) > step) 286 reqvid = data->currvid - step; 287 288 if (write_new_vid(data, reqvid)) 289 return 1; 290 291 count_off_vst(data); 292 293 return 0; 294 } 295 296 /* Change hardware pstate by single MSR write */ 297 static int transition_pstate(struct powernow_k8_data *data, u32 pstate) 298 { 299 wrmsr(MSR_PSTATE_CTRL, pstate, 0); 300 data->currpstate = pstate; 301 return 0; 302 } 303 304 /* Change Opteron/Athlon64 fid and vid, by the 3 phases. */ 305 static int transition_fid_vid(struct powernow_k8_data *data, 306 u32 reqfid, u32 reqvid) 307 { 308 if (core_voltage_pre_transition(data, reqvid, reqfid)) 309 return 1; 310 311 if (core_frequency_transition(data, reqfid)) 312 return 1; 313 314 if (core_voltage_post_transition(data, reqvid)) 315 return 1; 316 317 if (query_current_values_with_pending_wait(data)) 318 return 1; 319 320 if ((reqfid != data->currfid) || (reqvid != data->currvid)) { 321 printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, " 322 "curr 0x%x 0x%x\n", 323 smp_processor_id(), 324 reqfid, reqvid, data->currfid, data->currvid); 325 return 1; 326 } 327 328 pr_debug("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n", 329 smp_processor_id(), data->currfid, data->currvid); 330 331 return 0; 332 } 333 334 /* Phase 1 - core voltage transition ... setup voltage */ 335 static int core_voltage_pre_transition(struct powernow_k8_data *data, 336 u32 reqvid, u32 reqfid) 337 { 338 u32 rvosteps = data->rvo; 339 u32 savefid = data->currfid; 340 u32 maxvid, lo, rvomult = 1; 341 342 pr_debug("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, " 343 "reqvid 0x%x, rvo 0x%x\n", 344 smp_processor_id(), 345 data->currfid, data->currvid, reqvid, data->rvo); 346 347 if ((savefid < LO_FID_TABLE_TOP) && (reqfid < LO_FID_TABLE_TOP)) 348 rvomult = 2; 349 rvosteps *= rvomult; 350 rdmsr(MSR_FIDVID_STATUS, lo, maxvid); 351 maxvid = 0x1f & (maxvid >> 16); 352 pr_debug("ph1 maxvid=0x%x\n", maxvid); 353 if (reqvid < maxvid) /* lower numbers are higher voltages */ 354 reqvid = maxvid; 355 356 while (data->currvid > reqvid) { 357 pr_debug("ph1: curr 0x%x, req vid 0x%x\n", 358 data->currvid, reqvid); 359 if (decrease_vid_code_by_step(data, reqvid, data->vidmvs)) 360 return 1; 361 } 362 363 while ((rvosteps > 0) && 364 ((rvomult * data->rvo + data->currvid) > reqvid)) { 365 if (data->currvid == maxvid) { 366 rvosteps = 0; 367 } else { 368 pr_debug("ph1: changing vid for rvo, req 0x%x\n", 369 data->currvid - 1); 370 if (decrease_vid_code_by_step(data, data->currvid-1, 1)) 371 return 1; 372 rvosteps--; 373 } 374 } 375 376 if (query_current_values_with_pending_wait(data)) 377 return 1; 378 379 if (savefid != data->currfid) { 380 printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n", 381 data->currfid); 382 return 1; 383 } 384 385 pr_debug("ph1 complete, currfid 0x%x, currvid 0x%x\n", 386 data->currfid, data->currvid); 387 388 return 0; 389 } 390 391 /* Phase 2 - core frequency transition */ 392 static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid) 393 { 394 u32 vcoreqfid, vcocurrfid, vcofiddiff; 395 u32 fid_interval, savevid = data->currvid; 396 397 if (data->currfid == reqfid) { 398 printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n", 399 data->currfid); 400 return 0; 401 } 402 403 pr_debug("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, " 404 "reqfid 0x%x\n", 405 smp_processor_id(), 406 data->currfid, data->currvid, reqfid); 407 408 vcoreqfid = convert_fid_to_vco_fid(reqfid); 409 vcocurrfid = convert_fid_to_vco_fid(data->currfid); 410 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid 411 : vcoreqfid - vcocurrfid; 412 413 if ((reqfid <= LO_FID_TABLE_TOP) && (data->currfid <= LO_FID_TABLE_TOP)) 414 vcofiddiff = 0; 415 416 while (vcofiddiff > 2) { 417 (data->currfid & 1) ? (fid_interval = 1) : (fid_interval = 2); 418 419 if (reqfid > data->currfid) { 420 if (data->currfid > LO_FID_TABLE_TOP) { 421 if (write_new_fid(data, 422 data->currfid + fid_interval)) 423 return 1; 424 } else { 425 if (write_new_fid 426 (data, 427 2 + convert_fid_to_vco_fid(data->currfid))) 428 return 1; 429 } 430 } else { 431 if (write_new_fid(data, data->currfid - fid_interval)) 432 return 1; 433 } 434 435 vcocurrfid = convert_fid_to_vco_fid(data->currfid); 436 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid 437 : vcoreqfid - vcocurrfid; 438 } 439 440 if (write_new_fid(data, reqfid)) 441 return 1; 442 443 if (query_current_values_with_pending_wait(data)) 444 return 1; 445 446 if (data->currfid != reqfid) { 447 printk(KERN_ERR PFX 448 "ph2: mismatch, failed fid transition, " 449 "curr 0x%x, req 0x%x\n", 450 data->currfid, reqfid); 451 return 1; 452 } 453 454 if (savevid != data->currvid) { 455 printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n", 456 savevid, data->currvid); 457 return 1; 458 } 459 460 pr_debug("ph2 complete, currfid 0x%x, currvid 0x%x\n", 461 data->currfid, data->currvid); 462 463 return 0; 464 } 465 466 /* Phase 3 - core voltage transition flow ... jump to the final vid. */ 467 static int core_voltage_post_transition(struct powernow_k8_data *data, 468 u32 reqvid) 469 { 470 u32 savefid = data->currfid; 471 u32 savereqvid = reqvid; 472 473 pr_debug("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n", 474 smp_processor_id(), 475 data->currfid, data->currvid); 476 477 if (reqvid != data->currvid) { 478 if (write_new_vid(data, reqvid)) 479 return 1; 480 481 if (savefid != data->currfid) { 482 printk(KERN_ERR PFX 483 "ph3: bad fid change, save 0x%x, curr 0x%x\n", 484 savefid, data->currfid); 485 return 1; 486 } 487 488 if (data->currvid != reqvid) { 489 printk(KERN_ERR PFX 490 "ph3: failed vid transition\n, " 491 "req 0x%x, curr 0x%x", 492 reqvid, data->currvid); 493 return 1; 494 } 495 } 496 497 if (query_current_values_with_pending_wait(data)) 498 return 1; 499 500 if (savereqvid != data->currvid) { 501 pr_debug("ph3 failed, currvid 0x%x\n", data->currvid); 502 return 1; 503 } 504 505 if (savefid != data->currfid) { 506 pr_debug("ph3 failed, currfid changed 0x%x\n", 507 data->currfid); 508 return 1; 509 } 510 511 pr_debug("ph3 complete, currfid 0x%x, currvid 0x%x\n", 512 data->currfid, data->currvid); 513 514 return 0; 515 } 516 517 static void check_supported_cpu(void *_rc) 518 { 519 u32 eax, ebx, ecx, edx; 520 int *rc = _rc; 521 522 *rc = -ENODEV; 523 524 if (__this_cpu_read(cpu_info.x86_vendor) != X86_VENDOR_AMD) 525 return; 526 527 eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE); 528 if (((eax & CPUID_XFAM) != CPUID_XFAM_K8) && 529 ((eax & CPUID_XFAM) < CPUID_XFAM_10H)) 530 return; 531 532 if ((eax & CPUID_XFAM) == CPUID_XFAM_K8) { 533 if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) || 534 ((eax & CPUID_XMOD) > CPUID_XMOD_REV_MASK)) { 535 printk(KERN_INFO PFX 536 "Processor cpuid %x not supported\n", eax); 537 return; 538 } 539 540 eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES); 541 if (eax < CPUID_FREQ_VOLT_CAPABILITIES) { 542 printk(KERN_INFO PFX 543 "No frequency change capabilities detected\n"); 544 return; 545 } 546 547 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx); 548 if ((edx & P_STATE_TRANSITION_CAPABLE) 549 != P_STATE_TRANSITION_CAPABLE) { 550 printk(KERN_INFO PFX 551 "Power state transitions not supported\n"); 552 return; 553 } 554 } else { /* must be a HW Pstate capable processor */ 555 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx); 556 if ((edx & USE_HW_PSTATE) == USE_HW_PSTATE) 557 cpu_family = CPU_HW_PSTATE; 558 else 559 return; 560 } 561 562 *rc = 0; 563 } 564 565 static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst, 566 u8 maxvid) 567 { 568 unsigned int j; 569 u8 lastfid = 0xff; 570 571 for (j = 0; j < data->numps; j++) { 572 if (pst[j].vid > LEAST_VID) { 573 printk(KERN_ERR FW_BUG PFX "vid %d invalid : 0x%x\n", 574 j, pst[j].vid); 575 return -EINVAL; 576 } 577 if (pst[j].vid < data->rvo) { 578 /* vid + rvo >= 0 */ 579 printk(KERN_ERR FW_BUG PFX "0 vid exceeded with pstate" 580 " %d\n", j); 581 return -ENODEV; 582 } 583 if (pst[j].vid < maxvid + data->rvo) { 584 /* vid + rvo >= maxvid */ 585 printk(KERN_ERR FW_BUG PFX "maxvid exceeded with pstate" 586 " %d\n", j); 587 return -ENODEV; 588 } 589 if (pst[j].fid > MAX_FID) { 590 printk(KERN_ERR FW_BUG PFX "maxfid exceeded with pstate" 591 " %d\n", j); 592 return -ENODEV; 593 } 594 if (j && (pst[j].fid < HI_FID_TABLE_BOTTOM)) { 595 /* Only first fid is allowed to be in "low" range */ 596 printk(KERN_ERR FW_BUG PFX "two low fids - %d : " 597 "0x%x\n", j, pst[j].fid); 598 return -EINVAL; 599 } 600 if (pst[j].fid < lastfid) 601 lastfid = pst[j].fid; 602 } 603 if (lastfid & 1) { 604 printk(KERN_ERR FW_BUG PFX "lastfid invalid\n"); 605 return -EINVAL; 606 } 607 if (lastfid > LO_FID_TABLE_TOP) 608 printk(KERN_INFO FW_BUG PFX 609 "first fid not from lo freq table\n"); 610 611 return 0; 612 } 613 614 static void invalidate_entry(struct cpufreq_frequency_table *powernow_table, 615 unsigned int entry) 616 { 617 powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID; 618 } 619 620 static void print_basics(struct powernow_k8_data *data) 621 { 622 int j; 623 for (j = 0; j < data->numps; j++) { 624 if (data->powernow_table[j].frequency != 625 CPUFREQ_ENTRY_INVALID) { 626 if (cpu_family == CPU_HW_PSTATE) { 627 printk(KERN_INFO PFX 628 " %d : pstate %d (%d MHz)\n", j, 629 data->powernow_table[j].index, 630 data->powernow_table[j].frequency/1000); 631 } else { 632 printk(KERN_INFO PFX 633 "fid 0x%x (%d MHz), vid 0x%x\n", 634 data->powernow_table[j].index & 0xff, 635 data->powernow_table[j].frequency/1000, 636 data->powernow_table[j].index >> 8); 637 } 638 } 639 } 640 if (data->batps) 641 printk(KERN_INFO PFX "Only %d pstates on battery\n", 642 data->batps); 643 } 644 645 static u32 freq_from_fid_did(u32 fid, u32 did) 646 { 647 u32 mhz = 0; 648 649 if (boot_cpu_data.x86 == 0x10) 650 mhz = (100 * (fid + 0x10)) >> did; 651 else if (boot_cpu_data.x86 == 0x11) 652 mhz = (100 * (fid + 8)) >> did; 653 else 654 BUG(); 655 656 return mhz * 1000; 657 } 658 659 static int fill_powernow_table(struct powernow_k8_data *data, 660 struct pst_s *pst, u8 maxvid) 661 { 662 struct cpufreq_frequency_table *powernow_table; 663 unsigned int j; 664 665 if (data->batps) { 666 /* use ACPI support to get full speed on mains power */ 667 printk(KERN_WARNING PFX 668 "Only %d pstates usable (use ACPI driver for full " 669 "range\n", data->batps); 670 data->numps = data->batps; 671 } 672 673 for (j = 1; j < data->numps; j++) { 674 if (pst[j-1].fid >= pst[j].fid) { 675 printk(KERN_ERR PFX "PST out of sequence\n"); 676 return -EINVAL; 677 } 678 } 679 680 if (data->numps < 2) { 681 printk(KERN_ERR PFX "no p states to transition\n"); 682 return -ENODEV; 683 } 684 685 if (check_pst_table(data, pst, maxvid)) 686 return -EINVAL; 687 688 powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table) 689 * (data->numps + 1)), GFP_KERNEL); 690 if (!powernow_table) { 691 printk(KERN_ERR PFX "powernow_table memory alloc failure\n"); 692 return -ENOMEM; 693 } 694 695 for (j = 0; j < data->numps; j++) { 696 int freq; 697 powernow_table[j].index = pst[j].fid; /* lower 8 bits */ 698 powernow_table[j].index |= (pst[j].vid << 8); /* upper 8 bits */ 699 freq = find_khz_freq_from_fid(pst[j].fid); 700 powernow_table[j].frequency = freq; 701 } 702 powernow_table[data->numps].frequency = CPUFREQ_TABLE_END; 703 powernow_table[data->numps].index = 0; 704 705 if (query_current_values_with_pending_wait(data)) { 706 kfree(powernow_table); 707 return -EIO; 708 } 709 710 pr_debug("cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid); 711 data->powernow_table = powernow_table; 712 if (cpumask_first(cpu_core_mask(data->cpu)) == data->cpu) 713 print_basics(data); 714 715 for (j = 0; j < data->numps; j++) 716 if ((pst[j].fid == data->currfid) && 717 (pst[j].vid == data->currvid)) 718 return 0; 719 720 pr_debug("currfid/vid do not match PST, ignoring\n"); 721 return 0; 722 } 723 724 /* Find and validate the PSB/PST table in BIOS. */ 725 static int find_psb_table(struct powernow_k8_data *data) 726 { 727 struct psb_s *psb; 728 unsigned int i; 729 u32 mvs; 730 u8 maxvid; 731 u32 cpst = 0; 732 u32 thiscpuid; 733 734 for (i = 0xc0000; i < 0xffff0; i += 0x10) { 735 /* Scan BIOS looking for the signature. */ 736 /* It can not be at ffff0 - it is too big. */ 737 738 psb = phys_to_virt(i); 739 if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0) 740 continue; 741 742 pr_debug("found PSB header at 0x%p\n", psb); 743 744 pr_debug("table vers: 0x%x\n", psb->tableversion); 745 if (psb->tableversion != PSB_VERSION_1_4) { 746 printk(KERN_ERR FW_BUG PFX "PSB table is not v1.4\n"); 747 return -ENODEV; 748 } 749 750 pr_debug("flags: 0x%x\n", psb->flags1); 751 if (psb->flags1) { 752 printk(KERN_ERR FW_BUG PFX "unknown flags\n"); 753 return -ENODEV; 754 } 755 756 data->vstable = psb->vstable; 757 pr_debug("voltage stabilization time: %d(*20us)\n", 758 data->vstable); 759 760 pr_debug("flags2: 0x%x\n", psb->flags2); 761 data->rvo = psb->flags2 & 3; 762 data->irt = ((psb->flags2) >> 2) & 3; 763 mvs = ((psb->flags2) >> 4) & 3; 764 data->vidmvs = 1 << mvs; 765 data->batps = ((psb->flags2) >> 6) & 3; 766 767 pr_debug("ramp voltage offset: %d\n", data->rvo); 768 pr_debug("isochronous relief time: %d\n", data->irt); 769 pr_debug("maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs); 770 771 pr_debug("numpst: 0x%x\n", psb->num_tables); 772 cpst = psb->num_tables; 773 if ((psb->cpuid == 0x00000fc0) || 774 (psb->cpuid == 0x00000fe0)) { 775 thiscpuid = cpuid_eax(CPUID_PROCESSOR_SIGNATURE); 776 if ((thiscpuid == 0x00000fc0) || 777 (thiscpuid == 0x00000fe0)) 778 cpst = 1; 779 } 780 if (cpst != 1) { 781 printk(KERN_ERR FW_BUG PFX "numpst must be 1\n"); 782 return -ENODEV; 783 } 784 785 data->plllock = psb->plllocktime; 786 pr_debug("plllocktime: 0x%x (units 1us)\n", psb->plllocktime); 787 pr_debug("maxfid: 0x%x\n", psb->maxfid); 788 pr_debug("maxvid: 0x%x\n", psb->maxvid); 789 maxvid = psb->maxvid; 790 791 data->numps = psb->numps; 792 pr_debug("numpstates: 0x%x\n", data->numps); 793 return fill_powernow_table(data, 794 (struct pst_s *)(psb+1), maxvid); 795 } 796 /* 797 * If you see this message, complain to BIOS manufacturer. If 798 * he tells you "we do not support Linux" or some similar 799 * nonsense, remember that Windows 2000 uses the same legacy 800 * mechanism that the old Linux PSB driver uses. Tell them it 801 * is broken with Windows 2000. 802 * 803 * The reference to the AMD documentation is chapter 9 in the 804 * BIOS and Kernel Developer's Guide, which is available on 805 * www.amd.com 806 */ 807 printk(KERN_ERR FW_BUG PFX "No PSB or ACPI _PSS objects\n"); 808 printk(KERN_ERR PFX "Make sure that your BIOS is up to date" 809 " and Cool'N'Quiet support is enabled in BIOS setup\n"); 810 return -ENODEV; 811 } 812 813 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, 814 unsigned int index) 815 { 816 u64 control; 817 818 if (!data->acpi_data.state_count || (cpu_family == CPU_HW_PSTATE)) 819 return; 820 821 control = data->acpi_data.states[index].control; 822 data->irt = (control >> IRT_SHIFT) & IRT_MASK; 823 data->rvo = (control >> RVO_SHIFT) & RVO_MASK; 824 data->exttype = (control >> EXT_TYPE_SHIFT) & EXT_TYPE_MASK; 825 data->plllock = (control >> PLL_L_SHIFT) & PLL_L_MASK; 826 data->vidmvs = 1 << ((control >> MVS_SHIFT) & MVS_MASK); 827 data->vstable = (control >> VST_SHIFT) & VST_MASK; 828 } 829 830 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data) 831 { 832 struct cpufreq_frequency_table *powernow_table; 833 int ret_val = -ENODEV; 834 u64 control, status; 835 836 if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) { 837 pr_debug("register performance failed: bad ACPI data\n"); 838 return -EIO; 839 } 840 841 /* verify the data contained in the ACPI structures */ 842 if (data->acpi_data.state_count <= 1) { 843 pr_debug("No ACPI P-States\n"); 844 goto err_out; 845 } 846 847 control = data->acpi_data.control_register.space_id; 848 status = data->acpi_data.status_register.space_id; 849 850 if ((control != ACPI_ADR_SPACE_FIXED_HARDWARE) || 851 (status != ACPI_ADR_SPACE_FIXED_HARDWARE)) { 852 pr_debug("Invalid control/status registers (%llx - %llx)\n", 853 control, status); 854 goto err_out; 855 } 856 857 /* fill in data->powernow_table */ 858 powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table) 859 * (data->acpi_data.state_count + 1)), GFP_KERNEL); 860 if (!powernow_table) { 861 pr_debug("powernow_table memory alloc failure\n"); 862 goto err_out; 863 } 864 865 /* fill in data */ 866 data->numps = data->acpi_data.state_count; 867 powernow_k8_acpi_pst_values(data, 0); 868 869 if (cpu_family == CPU_HW_PSTATE) 870 ret_val = fill_powernow_table_pstate(data, powernow_table); 871 else 872 ret_val = fill_powernow_table_fidvid(data, powernow_table); 873 if (ret_val) 874 goto err_out_mem; 875 876 powernow_table[data->acpi_data.state_count].frequency = 877 CPUFREQ_TABLE_END; 878 powernow_table[data->acpi_data.state_count].index = 0; 879 data->powernow_table = powernow_table; 880 881 if (cpumask_first(cpu_core_mask(data->cpu)) == data->cpu) 882 print_basics(data); 883 884 /* notify BIOS that we exist */ 885 acpi_processor_notify_smm(THIS_MODULE); 886 887 if (!zalloc_cpumask_var(&data->acpi_data.shared_cpu_map, GFP_KERNEL)) { 888 printk(KERN_ERR PFX 889 "unable to alloc powernow_k8_data cpumask\n"); 890 ret_val = -ENOMEM; 891 goto err_out_mem; 892 } 893 894 return 0; 895 896 err_out_mem: 897 kfree(powernow_table); 898 899 err_out: 900 acpi_processor_unregister_performance(&data->acpi_data, data->cpu); 901 902 /* data->acpi_data.state_count informs us at ->exit() 903 * whether ACPI was used */ 904 data->acpi_data.state_count = 0; 905 906 return ret_val; 907 } 908 909 static int fill_powernow_table_pstate(struct powernow_k8_data *data, 910 struct cpufreq_frequency_table *powernow_table) 911 { 912 int i; 913 u32 hi = 0, lo = 0; 914 rdmsr(MSR_PSTATE_CUR_LIMIT, lo, hi); 915 data->max_hw_pstate = (lo & HW_PSTATE_MAX_MASK) >> HW_PSTATE_MAX_SHIFT; 916 917 for (i = 0; i < data->acpi_data.state_count; i++) { 918 u32 index; 919 920 index = data->acpi_data.states[i].control & HW_PSTATE_MASK; 921 if (index > data->max_hw_pstate) { 922 printk(KERN_ERR PFX "invalid pstate %d - " 923 "bad value %d.\n", i, index); 924 printk(KERN_ERR PFX "Please report to BIOS " 925 "manufacturer\n"); 926 invalidate_entry(powernow_table, i); 927 continue; 928 } 929 rdmsr(MSR_PSTATE_DEF_BASE + index, lo, hi); 930 if (!(hi & HW_PSTATE_VALID_MASK)) { 931 pr_debug("invalid pstate %d, ignoring\n", index); 932 invalidate_entry(powernow_table, i); 933 continue; 934 } 935 936 powernow_table[i].index = index; 937 938 /* Frequency may be rounded for these */ 939 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) 940 || boot_cpu_data.x86 == 0x11) { 941 powernow_table[i].frequency = 942 freq_from_fid_did(lo & 0x3f, (lo >> 6) & 7); 943 } else 944 powernow_table[i].frequency = 945 data->acpi_data.states[i].core_frequency * 1000; 946 } 947 return 0; 948 } 949 950 static int fill_powernow_table_fidvid(struct powernow_k8_data *data, 951 struct cpufreq_frequency_table *powernow_table) 952 { 953 int i; 954 955 for (i = 0; i < data->acpi_data.state_count; i++) { 956 u32 fid; 957 u32 vid; 958 u32 freq, index; 959 u64 status, control; 960 961 if (data->exttype) { 962 status = data->acpi_data.states[i].status; 963 fid = status & EXT_FID_MASK; 964 vid = (status >> VID_SHIFT) & EXT_VID_MASK; 965 } else { 966 control = data->acpi_data.states[i].control; 967 fid = control & FID_MASK; 968 vid = (control >> VID_SHIFT) & VID_MASK; 969 } 970 971 pr_debug(" %d : fid 0x%x, vid 0x%x\n", i, fid, vid); 972 973 index = fid | (vid<<8); 974 powernow_table[i].index = index; 975 976 freq = find_khz_freq_from_fid(fid); 977 powernow_table[i].frequency = freq; 978 979 /* verify frequency is OK */ 980 if ((freq > (MAX_FREQ * 1000)) || (freq < (MIN_FREQ * 1000))) { 981 pr_debug("invalid freq %u kHz, ignoring\n", freq); 982 invalidate_entry(powernow_table, i); 983 continue; 984 } 985 986 /* verify voltage is OK - 987 * BIOSs are using "off" to indicate invalid */ 988 if (vid == VID_OFF) { 989 pr_debug("invalid vid %u, ignoring\n", vid); 990 invalidate_entry(powernow_table, i); 991 continue; 992 } 993 994 if (freq != (data->acpi_data.states[i].core_frequency * 1000)) { 995 printk(KERN_INFO PFX "invalid freq entries " 996 "%u kHz vs. %u kHz\n", freq, 997 (unsigned int) 998 (data->acpi_data.states[i].core_frequency 999 * 1000)); 1000 invalidate_entry(powernow_table, i); 1001 continue; 1002 } 1003 } 1004 return 0; 1005 } 1006 1007 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data) 1008 { 1009 if (data->acpi_data.state_count) 1010 acpi_processor_unregister_performance(&data->acpi_data, 1011 data->cpu); 1012 free_cpumask_var(data->acpi_data.shared_cpu_map); 1013 } 1014 1015 static int get_transition_latency(struct powernow_k8_data *data) 1016 { 1017 int max_latency = 0; 1018 int i; 1019 for (i = 0; i < data->acpi_data.state_count; i++) { 1020 int cur_latency = data->acpi_data.states[i].transition_latency 1021 + data->acpi_data.states[i].bus_master_latency; 1022 if (cur_latency > max_latency) 1023 max_latency = cur_latency; 1024 } 1025 if (max_latency == 0) { 1026 /* 1027 * Fam 11h and later may return 0 as transition latency. This 1028 * is intended and means "very fast". While cpufreq core and 1029 * governors currently can handle that gracefully, better set it 1030 * to 1 to avoid problems in the future. 1031 */ 1032 if (boot_cpu_data.x86 < 0x11) 1033 printk(KERN_ERR FW_WARN PFX "Invalid zero transition " 1034 "latency\n"); 1035 max_latency = 1; 1036 } 1037 /* value in usecs, needs to be in nanoseconds */ 1038 return 1000 * max_latency; 1039 } 1040 1041 /* Take a frequency, and issue the fid/vid transition command */ 1042 static int transition_frequency_fidvid(struct powernow_k8_data *data, 1043 unsigned int index) 1044 { 1045 u32 fid = 0; 1046 u32 vid = 0; 1047 int res, i; 1048 struct cpufreq_freqs freqs; 1049 1050 pr_debug("cpu %d transition to index %u\n", smp_processor_id(), index); 1051 1052 /* fid/vid correctness check for k8 */ 1053 /* fid are the lower 8 bits of the index we stored into 1054 * the cpufreq frequency table in find_psb_table, vid 1055 * are the upper 8 bits. 1056 */ 1057 fid = data->powernow_table[index].index & 0xFF; 1058 vid = (data->powernow_table[index].index & 0xFF00) >> 8; 1059 1060 pr_debug("table matched fid 0x%x, giving vid 0x%x\n", fid, vid); 1061 1062 if (query_current_values_with_pending_wait(data)) 1063 return 1; 1064 1065 if ((data->currvid == vid) && (data->currfid == fid)) { 1066 pr_debug("target matches current values (fid 0x%x, vid 0x%x)\n", 1067 fid, vid); 1068 return 0; 1069 } 1070 1071 pr_debug("cpu %d, changing to fid 0x%x, vid 0x%x\n", 1072 smp_processor_id(), fid, vid); 1073 freqs.old = find_khz_freq_from_fid(data->currfid); 1074 freqs.new = find_khz_freq_from_fid(fid); 1075 1076 for_each_cpu(i, data->available_cores) { 1077 freqs.cpu = i; 1078 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); 1079 } 1080 1081 res = transition_fid_vid(data, fid, vid); 1082 if (res) 1083 return res; 1084 1085 freqs.new = find_khz_freq_from_fid(data->currfid); 1086 1087 for_each_cpu(i, data->available_cores) { 1088 freqs.cpu = i; 1089 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); 1090 } 1091 return res; 1092 } 1093 1094 /* Take a frequency, and issue the hardware pstate transition command */ 1095 static int transition_frequency_pstate(struct powernow_k8_data *data, 1096 unsigned int index) 1097 { 1098 u32 pstate = 0; 1099 int res, i; 1100 struct cpufreq_freqs freqs; 1101 1102 pr_debug("cpu %d transition to index %u\n", smp_processor_id(), index); 1103 1104 /* get MSR index for hardware pstate transition */ 1105 pstate = index & HW_PSTATE_MASK; 1106 if (pstate > data->max_hw_pstate) 1107 return -EINVAL; 1108 1109 freqs.old = find_khz_freq_from_pstate(data->powernow_table, 1110 data->currpstate); 1111 freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate); 1112 1113 for_each_cpu(i, data->available_cores) { 1114 freqs.cpu = i; 1115 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); 1116 } 1117 1118 res = transition_pstate(data, pstate); 1119 freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate); 1120 1121 for_each_cpu(i, data->available_cores) { 1122 freqs.cpu = i; 1123 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); 1124 } 1125 return res; 1126 } 1127 1128 /* Driver entry point to switch to the target frequency */ 1129 static int powernowk8_target(struct cpufreq_policy *pol, 1130 unsigned targfreq, unsigned relation) 1131 { 1132 cpumask_var_t oldmask; 1133 struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu); 1134 u32 checkfid; 1135 u32 checkvid; 1136 unsigned int newstate; 1137 int ret = -EIO; 1138 1139 if (!data) 1140 return -EINVAL; 1141 1142 checkfid = data->currfid; 1143 checkvid = data->currvid; 1144 1145 /* only run on specific CPU from here on. */ 1146 /* This is poor form: use a workqueue or smp_call_function_single */ 1147 if (!alloc_cpumask_var(&oldmask, GFP_KERNEL)) 1148 return -ENOMEM; 1149 1150 cpumask_copy(oldmask, tsk_cpus_allowed(current)); 1151 set_cpus_allowed_ptr(current, cpumask_of(pol->cpu)); 1152 1153 if (smp_processor_id() != pol->cpu) { 1154 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu); 1155 goto err_out; 1156 } 1157 1158 if (pending_bit_stuck()) { 1159 printk(KERN_ERR PFX "failing targ, change pending bit set\n"); 1160 goto err_out; 1161 } 1162 1163 pr_debug("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n", 1164 pol->cpu, targfreq, pol->min, pol->max, relation); 1165 1166 if (query_current_values_with_pending_wait(data)) 1167 goto err_out; 1168 1169 if (cpu_family != CPU_HW_PSTATE) { 1170 pr_debug("targ: curr fid 0x%x, vid 0x%x\n", 1171 data->currfid, data->currvid); 1172 1173 if ((checkvid != data->currvid) || 1174 (checkfid != data->currfid)) { 1175 printk(KERN_INFO PFX 1176 "error - out of sync, fix 0x%x 0x%x, " 1177 "vid 0x%x 0x%x\n", 1178 checkfid, data->currfid, 1179 checkvid, data->currvid); 1180 } 1181 } 1182 1183 if (cpufreq_frequency_table_target(pol, data->powernow_table, 1184 targfreq, relation, &newstate)) 1185 goto err_out; 1186 1187 mutex_lock(&fidvid_mutex); 1188 1189 powernow_k8_acpi_pst_values(data, newstate); 1190 1191 if (cpu_family == CPU_HW_PSTATE) 1192 ret = transition_frequency_pstate(data, newstate); 1193 else 1194 ret = transition_frequency_fidvid(data, newstate); 1195 if (ret) { 1196 printk(KERN_ERR PFX "transition frequency failed\n"); 1197 ret = 1; 1198 mutex_unlock(&fidvid_mutex); 1199 goto err_out; 1200 } 1201 mutex_unlock(&fidvid_mutex); 1202 1203 if (cpu_family == CPU_HW_PSTATE) 1204 pol->cur = find_khz_freq_from_pstate(data->powernow_table, 1205 newstate); 1206 else 1207 pol->cur = find_khz_freq_from_fid(data->currfid); 1208 ret = 0; 1209 1210 err_out: 1211 set_cpus_allowed_ptr(current, oldmask); 1212 free_cpumask_var(oldmask); 1213 return ret; 1214 } 1215 1216 /* Driver entry point to verify the policy and range of frequencies */ 1217 static int powernowk8_verify(struct cpufreq_policy *pol) 1218 { 1219 struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu); 1220 1221 if (!data) 1222 return -EINVAL; 1223 1224 return cpufreq_frequency_table_verify(pol, data->powernow_table); 1225 } 1226 1227 struct init_on_cpu { 1228 struct powernow_k8_data *data; 1229 int rc; 1230 }; 1231 1232 static void __cpuinit powernowk8_cpu_init_on_cpu(void *_init_on_cpu) 1233 { 1234 struct init_on_cpu *init_on_cpu = _init_on_cpu; 1235 1236 if (pending_bit_stuck()) { 1237 printk(KERN_ERR PFX "failing init, change pending bit set\n"); 1238 init_on_cpu->rc = -ENODEV; 1239 return; 1240 } 1241 1242 if (query_current_values_with_pending_wait(init_on_cpu->data)) { 1243 init_on_cpu->rc = -ENODEV; 1244 return; 1245 } 1246 1247 if (cpu_family == CPU_OPTERON) 1248 fidvid_msr_init(); 1249 1250 init_on_cpu->rc = 0; 1251 } 1252 1253 /* per CPU init entry point to the driver */ 1254 static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol) 1255 { 1256 static const char ACPI_PSS_BIOS_BUG_MSG[] = 1257 KERN_ERR FW_BUG PFX "No compatible ACPI _PSS objects found.\n" 1258 FW_BUG PFX "Try again with latest BIOS.\n"; 1259 struct powernow_k8_data *data; 1260 struct init_on_cpu init_on_cpu; 1261 int rc; 1262 struct cpuinfo_x86 *c = &cpu_data(pol->cpu); 1263 1264 if (!cpu_online(pol->cpu)) 1265 return -ENODEV; 1266 1267 smp_call_function_single(pol->cpu, check_supported_cpu, &rc, 1); 1268 if (rc) 1269 return -ENODEV; 1270 1271 data = kzalloc(sizeof(struct powernow_k8_data), GFP_KERNEL); 1272 if (!data) { 1273 printk(KERN_ERR PFX "unable to alloc powernow_k8_data"); 1274 return -ENOMEM; 1275 } 1276 1277 data->cpu = pol->cpu; 1278 data->currpstate = HW_PSTATE_INVALID; 1279 1280 if (powernow_k8_cpu_init_acpi(data)) { 1281 /* 1282 * Use the PSB BIOS structure. This is only available on 1283 * an UP version, and is deprecated by AMD. 1284 */ 1285 if (num_online_cpus() != 1) { 1286 printk_once(ACPI_PSS_BIOS_BUG_MSG); 1287 goto err_out; 1288 } 1289 if (pol->cpu != 0) { 1290 printk(KERN_ERR FW_BUG PFX "No ACPI _PSS objects for " 1291 "CPU other than CPU0. Complain to your BIOS " 1292 "vendor.\n"); 1293 goto err_out; 1294 } 1295 rc = find_psb_table(data); 1296 if (rc) 1297 goto err_out; 1298 1299 /* Take a crude guess here. 1300 * That guess was in microseconds, so multiply with 1000 */ 1301 pol->cpuinfo.transition_latency = ( 1302 ((data->rvo + 8) * data->vstable * VST_UNITS_20US) + 1303 ((1 << data->irt) * 30)) * 1000; 1304 } else /* ACPI _PSS objects available */ 1305 pol->cpuinfo.transition_latency = get_transition_latency(data); 1306 1307 /* only run on specific CPU from here on */ 1308 init_on_cpu.data = data; 1309 smp_call_function_single(data->cpu, powernowk8_cpu_init_on_cpu, 1310 &init_on_cpu, 1); 1311 rc = init_on_cpu.rc; 1312 if (rc != 0) 1313 goto err_out_exit_acpi; 1314 1315 if (cpu_family == CPU_HW_PSTATE) 1316 cpumask_copy(pol->cpus, cpumask_of(pol->cpu)); 1317 else 1318 cpumask_copy(pol->cpus, cpu_core_mask(pol->cpu)); 1319 data->available_cores = pol->cpus; 1320 1321 if (cpu_family == CPU_HW_PSTATE) 1322 pol->cur = find_khz_freq_from_pstate(data->powernow_table, 1323 data->currpstate); 1324 else 1325 pol->cur = find_khz_freq_from_fid(data->currfid); 1326 pr_debug("policy current frequency %d kHz\n", pol->cur); 1327 1328 /* min/max the cpu is capable of */ 1329 if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) { 1330 printk(KERN_ERR FW_BUG PFX "invalid powernow_table\n"); 1331 powernow_k8_cpu_exit_acpi(data); 1332 kfree(data->powernow_table); 1333 kfree(data); 1334 return -EINVAL; 1335 } 1336 1337 /* Check for APERF/MPERF support in hardware */ 1338 if (cpu_has(c, X86_FEATURE_APERFMPERF)) 1339 cpufreq_amd64_driver.getavg = cpufreq_get_measured_perf; 1340 1341 cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu); 1342 1343 if (cpu_family == CPU_HW_PSTATE) 1344 pr_debug("cpu_init done, current pstate 0x%x\n", 1345 data->currpstate); 1346 else 1347 pr_debug("cpu_init done, current fid 0x%x, vid 0x%x\n", 1348 data->currfid, data->currvid); 1349 1350 per_cpu(powernow_data, pol->cpu) = data; 1351 1352 return 0; 1353 1354 err_out_exit_acpi: 1355 powernow_k8_cpu_exit_acpi(data); 1356 1357 err_out: 1358 kfree(data); 1359 return -ENODEV; 1360 } 1361 1362 static int __devexit powernowk8_cpu_exit(struct cpufreq_policy *pol) 1363 { 1364 struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu); 1365 1366 if (!data) 1367 return -EINVAL; 1368 1369 powernow_k8_cpu_exit_acpi(data); 1370 1371 cpufreq_frequency_table_put_attr(pol->cpu); 1372 1373 kfree(data->powernow_table); 1374 kfree(data); 1375 per_cpu(powernow_data, pol->cpu) = NULL; 1376 1377 return 0; 1378 } 1379 1380 static void query_values_on_cpu(void *_err) 1381 { 1382 int *err = _err; 1383 struct powernow_k8_data *data = __this_cpu_read(powernow_data); 1384 1385 *err = query_current_values_with_pending_wait(data); 1386 } 1387 1388 static unsigned int powernowk8_get(unsigned int cpu) 1389 { 1390 struct powernow_k8_data *data = per_cpu(powernow_data, cpu); 1391 unsigned int khz = 0; 1392 int err; 1393 1394 if (!data) 1395 return 0; 1396 1397 smp_call_function_single(cpu, query_values_on_cpu, &err, true); 1398 if (err) 1399 goto out; 1400 1401 if (cpu_family == CPU_HW_PSTATE) 1402 khz = find_khz_freq_from_pstate(data->powernow_table, 1403 data->currpstate); 1404 else 1405 khz = find_khz_freq_from_fid(data->currfid); 1406 1407 1408 out: 1409 return khz; 1410 } 1411 1412 static void _cpb_toggle_msrs(bool t) 1413 { 1414 int cpu; 1415 1416 get_online_cpus(); 1417 1418 rdmsr_on_cpus(cpu_online_mask, MSR_K7_HWCR, msrs); 1419 1420 for_each_cpu(cpu, cpu_online_mask) { 1421 struct msr *reg = per_cpu_ptr(msrs, cpu); 1422 if (t) 1423 reg->l &= ~BIT(25); 1424 else 1425 reg->l |= BIT(25); 1426 } 1427 wrmsr_on_cpus(cpu_online_mask, MSR_K7_HWCR, msrs); 1428 1429 put_online_cpus(); 1430 } 1431 1432 /* 1433 * Switch on/off core performance boosting. 1434 * 1435 * 0=disable 1436 * 1=enable. 1437 */ 1438 static void cpb_toggle(bool t) 1439 { 1440 if (!cpb_capable) 1441 return; 1442 1443 if (t && !cpb_enabled) { 1444 cpb_enabled = true; 1445 _cpb_toggle_msrs(t); 1446 printk(KERN_INFO PFX "Core Boosting enabled.\n"); 1447 } else if (!t && cpb_enabled) { 1448 cpb_enabled = false; 1449 _cpb_toggle_msrs(t); 1450 printk(KERN_INFO PFX "Core Boosting disabled.\n"); 1451 } 1452 } 1453 1454 static ssize_t store_cpb(struct cpufreq_policy *policy, const char *buf, 1455 size_t count) 1456 { 1457 int ret = -EINVAL; 1458 unsigned long val = 0; 1459 1460 ret = strict_strtoul(buf, 10, &val); 1461 if (!ret && (val == 0 || val == 1) && cpb_capable) 1462 cpb_toggle(val); 1463 else 1464 return -EINVAL; 1465 1466 return count; 1467 } 1468 1469 static ssize_t show_cpb(struct cpufreq_policy *policy, char *buf) 1470 { 1471 return sprintf(buf, "%u\n", cpb_enabled); 1472 } 1473 1474 #define define_one_rw(_name) \ 1475 static struct freq_attr _name = \ 1476 __ATTR(_name, 0644, show_##_name, store_##_name) 1477 1478 define_one_rw(cpb); 1479 1480 static struct freq_attr *powernow_k8_attr[] = { 1481 &cpufreq_freq_attr_scaling_available_freqs, 1482 &cpb, 1483 NULL, 1484 }; 1485 1486 static struct cpufreq_driver cpufreq_amd64_driver = { 1487 .verify = powernowk8_verify, 1488 .target = powernowk8_target, 1489 .bios_limit = acpi_processor_get_bios_limit, 1490 .init = powernowk8_cpu_init, 1491 .exit = __devexit_p(powernowk8_cpu_exit), 1492 .get = powernowk8_get, 1493 .name = "powernow-k8", 1494 .owner = THIS_MODULE, 1495 .attr = powernow_k8_attr, 1496 }; 1497 1498 /* 1499 * Clear the boost-disable flag on the CPU_DOWN path so that this cpu 1500 * cannot block the remaining ones from boosting. On the CPU_UP path we 1501 * simply keep the boost-disable flag in sync with the current global 1502 * state. 1503 */ 1504 static int cpb_notify(struct notifier_block *nb, unsigned long action, 1505 void *hcpu) 1506 { 1507 unsigned cpu = (long)hcpu; 1508 u32 lo, hi; 1509 1510 switch (action) { 1511 case CPU_UP_PREPARE: 1512 case CPU_UP_PREPARE_FROZEN: 1513 1514 if (!cpb_enabled) { 1515 rdmsr_on_cpu(cpu, MSR_K7_HWCR, &lo, &hi); 1516 lo |= BIT(25); 1517 wrmsr_on_cpu(cpu, MSR_K7_HWCR, lo, hi); 1518 } 1519 break; 1520 1521 case CPU_DOWN_PREPARE: 1522 case CPU_DOWN_PREPARE_FROZEN: 1523 rdmsr_on_cpu(cpu, MSR_K7_HWCR, &lo, &hi); 1524 lo &= ~BIT(25); 1525 wrmsr_on_cpu(cpu, MSR_K7_HWCR, lo, hi); 1526 break; 1527 1528 default: 1529 break; 1530 } 1531 1532 return NOTIFY_OK; 1533 } 1534 1535 static struct notifier_block cpb_nb = { 1536 .notifier_call = cpb_notify, 1537 }; 1538 1539 /* driver entry point for init */ 1540 static int __cpuinit powernowk8_init(void) 1541 { 1542 unsigned int i, supported_cpus = 0, cpu; 1543 int rv; 1544 1545 for_each_online_cpu(i) { 1546 int rc; 1547 smp_call_function_single(i, check_supported_cpu, &rc, 1); 1548 if (rc == 0) 1549 supported_cpus++; 1550 } 1551 1552 if (supported_cpus != num_online_cpus()) 1553 return -ENODEV; 1554 1555 printk(KERN_INFO PFX "Found %d %s (%d cpu cores) (" VERSION ")\n", 1556 num_online_nodes(), boot_cpu_data.x86_model_id, supported_cpus); 1557 1558 if (boot_cpu_has(X86_FEATURE_CPB)) { 1559 1560 cpb_capable = true; 1561 1562 msrs = msrs_alloc(); 1563 if (!msrs) { 1564 printk(KERN_ERR "%s: Error allocating msrs!\n", __func__); 1565 return -ENOMEM; 1566 } 1567 1568 register_cpu_notifier(&cpb_nb); 1569 1570 rdmsr_on_cpus(cpu_online_mask, MSR_K7_HWCR, msrs); 1571 1572 for_each_cpu(cpu, cpu_online_mask) { 1573 struct msr *reg = per_cpu_ptr(msrs, cpu); 1574 cpb_enabled |= !(!!(reg->l & BIT(25))); 1575 } 1576 1577 printk(KERN_INFO PFX "Core Performance Boosting: %s.\n", 1578 (cpb_enabled ? "on" : "off")); 1579 } 1580 1581 rv = cpufreq_register_driver(&cpufreq_amd64_driver); 1582 if (rv < 0 && boot_cpu_has(X86_FEATURE_CPB)) { 1583 unregister_cpu_notifier(&cpb_nb); 1584 msrs_free(msrs); 1585 msrs = NULL; 1586 } 1587 return rv; 1588 } 1589 1590 /* driver entry point for term */ 1591 static void __exit powernowk8_exit(void) 1592 { 1593 pr_debug("exit\n"); 1594 1595 if (boot_cpu_has(X86_FEATURE_CPB)) { 1596 msrs_free(msrs); 1597 msrs = NULL; 1598 1599 unregister_cpu_notifier(&cpb_nb); 1600 } 1601 1602 cpufreq_unregister_driver(&cpufreq_amd64_driver); 1603 } 1604 1605 MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and " 1606 "Mark Langsdorf <mark.langsdorf@amd.com>"); 1607 MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver."); 1608 MODULE_LICENSE("GPL"); 1609 1610 late_initcall(powernowk8_init); 1611 module_exit(powernowk8_exit); 1612