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30#include <linux/kernel.h>
31#include <linux/smp.h>
32#include <linux/module.h>
33#include <linux/init.h>
34#include <linux/cpufreq.h>
35#include <linux/slab.h>
36#include <linux/string.h>
37#include <linux/cpumask.h>
38#include <linux/io.h>
39#include <linux/delay.h>
40
41#include <asm/msr.h>
42#include <asm/cpu_device_id.h>
43
44#include <linux/acpi.h>
45#include <linux/mutex.h>
46#include <acpi/processor.h>
47
48#define PFX "powernow-k8: "
49#define VERSION "version 2.20.00"
50#include "powernow-k8.h"
51#include "mperf.h"
52
53
54static DEFINE_MUTEX(fidvid_mutex);
55
56static DEFINE_PER_CPU(struct powernow_k8_data *, powernow_data);
57
58static int cpu_family = CPU_OPTERON;
59
60
61static u32 ps_to_as[8];
62
63
64static bool cpb_capable, cpb_enabled;
65static struct msr __percpu *msrs;
66
67static struct cpufreq_driver cpufreq_amd64_driver;
68
69#ifndef CONFIG_SMP
70static inline const struct cpumask *cpu_core_mask(int cpu)
71{
72 return cpumask_of(0);
73}
74#endif
75
76
77static u32 find_freq_from_fid(u32 fid)
78{
79 return 800 + (fid * 100);
80}
81
82
83static u32 find_khz_freq_from_fid(u32 fid)
84{
85 return 1000 * find_freq_from_fid(fid);
86}
87
88static u32 find_khz_freq_from_pstate(struct cpufreq_frequency_table *data,
89 u32 pstate)
90{
91 return data[ps_to_as[pstate]].frequency;
92}
93
94
95
96
97
98
99
100static u32 convert_fid_to_vco_fid(u32 fid)
101{
102 if (fid < HI_FID_TABLE_BOTTOM)
103 return 8 + (2 * fid);
104 else
105 return fid;
106}
107
108
109
110
111
112static int pending_bit_stuck(void)
113{
114 u32 lo, hi;
115
116 if (cpu_family == CPU_HW_PSTATE)
117 return 0;
118
119 rdmsr(MSR_FIDVID_STATUS, lo, hi);
120 return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0;
121}
122
123
124
125
126
127static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
128{
129 u32 lo, hi;
130 u32 i = 0;
131
132 if (cpu_family == CPU_HW_PSTATE) {
133 rdmsr(MSR_PSTATE_STATUS, lo, hi);
134 i = lo & HW_PSTATE_MASK;
135 data->currpstate = i;
136
137
138
139
140
141 if ((boot_cpu_data.x86 == 0x11) && (i >= data->numps))
142 data->currpstate = HW_PSTATE_0;
143
144 return 0;
145 }
146 do {
147 if (i++ > 10000) {
148 pr_debug("detected change pending stuck\n");
149 return 1;
150 }
151 rdmsr(MSR_FIDVID_STATUS, lo, hi);
152 } while (lo & MSR_S_LO_CHANGE_PENDING);
153
154 data->currvid = hi & MSR_S_HI_CURRENT_VID;
155 data->currfid = lo & MSR_S_LO_CURRENT_FID;
156
157 return 0;
158}
159
160
161static void count_off_irt(struct powernow_k8_data *data)
162{
163 udelay((1 << data->irt) * 10);
164 return;
165}
166
167
168static void count_off_vst(struct powernow_k8_data *data)
169{
170 udelay(data->vstable * VST_UNITS_20US);
171 return;
172}
173
174
175static void fidvid_msr_init(void)
176{
177 u32 lo, hi;
178 u8 fid, vid;
179
180 rdmsr(MSR_FIDVID_STATUS, lo, hi);
181 vid = hi & MSR_S_HI_CURRENT_VID;
182 fid = lo & MSR_S_LO_CURRENT_FID;
183 lo = fid | (vid << MSR_C_LO_VID_SHIFT);
184 hi = MSR_C_HI_STP_GNT_BENIGN;
185 pr_debug("cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo, hi);
186 wrmsr(MSR_FIDVID_CTL, lo, hi);
187}
188
189
190static int write_new_fid(struct powernow_k8_data *data, u32 fid)
191{
192 u32 lo;
193 u32 savevid = data->currvid;
194 u32 i = 0;
195
196 if ((fid & INVALID_FID_MASK) || (data->currvid & INVALID_VID_MASK)) {
197 printk(KERN_ERR PFX "internal error - overflow on fid write\n");
198 return 1;
199 }
200
201 lo = fid;
202 lo |= (data->currvid << MSR_C_LO_VID_SHIFT);
203 lo |= MSR_C_LO_INIT_FID_VID;
204
205 pr_debug("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
206 fid, lo, data->plllock * PLL_LOCK_CONVERSION);
207
208 do {
209 wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
210 if (i++ > 100) {
211 printk(KERN_ERR PFX
212 "Hardware error - pending bit very stuck - "
213 "no further pstate changes possible\n");
214 return 1;
215 }
216 } while (query_current_values_with_pending_wait(data));
217
218 count_off_irt(data);
219
220 if (savevid != data->currvid) {
221 printk(KERN_ERR PFX
222 "vid change on fid trans, old 0x%x, new 0x%x\n",
223 savevid, data->currvid);
224 return 1;
225 }
226
227 if (fid != data->currfid) {
228 printk(KERN_ERR PFX
229 "fid trans failed, fid 0x%x, curr 0x%x\n", fid,
230 data->currfid);
231 return 1;
232 }
233
234 return 0;
235}
236
237
238static int write_new_vid(struct powernow_k8_data *data, u32 vid)
239{
240 u32 lo;
241 u32 savefid = data->currfid;
242 int i = 0;
243
244 if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) {
245 printk(KERN_ERR PFX "internal error - overflow on vid write\n");
246 return 1;
247 }
248
249 lo = data->currfid;
250 lo |= (vid << MSR_C_LO_VID_SHIFT);
251 lo |= MSR_C_LO_INIT_FID_VID;
252
253 pr_debug("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
254 vid, lo, STOP_GRANT_5NS);
255
256 do {
257 wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
258 if (i++ > 100) {
259 printk(KERN_ERR PFX "internal error - pending bit "
260 "very stuck - no further pstate "
261 "changes possible\n");
262 return 1;
263 }
264 } while (query_current_values_with_pending_wait(data));
265
266 if (savefid != data->currfid) {
267 printk(KERN_ERR PFX "fid changed on vid trans, old "
268 "0x%x new 0x%x\n",
269 savefid, data->currfid);
270 return 1;
271 }
272
273 if (vid != data->currvid) {
274 printk(KERN_ERR PFX "vid trans failed, vid 0x%x, "
275 "curr 0x%x\n",
276 vid, data->currvid);
277 return 1;
278 }
279
280 return 0;
281}
282
283
284
285
286
287
288static int decrease_vid_code_by_step(struct powernow_k8_data *data,
289 u32 reqvid, u32 step)
290{
291 if ((data->currvid - reqvid) > step)
292 reqvid = data->currvid - step;
293
294 if (write_new_vid(data, reqvid))
295 return 1;
296
297 count_off_vst(data);
298
299 return 0;
300}
301
302
303static int transition_pstate(struct powernow_k8_data *data, u32 pstate)
304{
305 wrmsr(MSR_PSTATE_CTRL, pstate, 0);
306 data->currpstate = pstate;
307 return 0;
308}
309
310
311static int transition_fid_vid(struct powernow_k8_data *data,
312 u32 reqfid, u32 reqvid)
313{
314 if (core_voltage_pre_transition(data, reqvid, reqfid))
315 return 1;
316
317 if (core_frequency_transition(data, reqfid))
318 return 1;
319
320 if (core_voltage_post_transition(data, reqvid))
321 return 1;
322
323 if (query_current_values_with_pending_wait(data))
324 return 1;
325
326 if ((reqfid != data->currfid) || (reqvid != data->currvid)) {
327 printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, "
328 "curr 0x%x 0x%x\n",
329 smp_processor_id(),
330 reqfid, reqvid, data->currfid, data->currvid);
331 return 1;
332 }
333
334 pr_debug("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
335 smp_processor_id(), data->currfid, data->currvid);
336
337 return 0;
338}
339
340
341static int core_voltage_pre_transition(struct powernow_k8_data *data,
342 u32 reqvid, u32 reqfid)
343{
344 u32 rvosteps = data->rvo;
345 u32 savefid = data->currfid;
346 u32 maxvid, lo, rvomult = 1;
347
348 pr_debug("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, "
349 "reqvid 0x%x, rvo 0x%x\n",
350 smp_processor_id(),
351 data->currfid, data->currvid, reqvid, data->rvo);
352
353 if ((savefid < LO_FID_TABLE_TOP) && (reqfid < LO_FID_TABLE_TOP))
354 rvomult = 2;
355 rvosteps *= rvomult;
356 rdmsr(MSR_FIDVID_STATUS, lo, maxvid);
357 maxvid = 0x1f & (maxvid >> 16);
358 pr_debug("ph1 maxvid=0x%x\n", maxvid);
359 if (reqvid < maxvid)
360 reqvid = maxvid;
361
362 while (data->currvid > reqvid) {
363 pr_debug("ph1: curr 0x%x, req vid 0x%x\n",
364 data->currvid, reqvid);
365 if (decrease_vid_code_by_step(data, reqvid, data->vidmvs))
366 return 1;
367 }
368
369 while ((rvosteps > 0) &&
370 ((rvomult * data->rvo + data->currvid) > reqvid)) {
371 if (data->currvid == maxvid) {
372 rvosteps = 0;
373 } else {
374 pr_debug("ph1: changing vid for rvo, req 0x%x\n",
375 data->currvid - 1);
376 if (decrease_vid_code_by_step(data, data->currvid-1, 1))
377 return 1;
378 rvosteps--;
379 }
380 }
381
382 if (query_current_values_with_pending_wait(data))
383 return 1;
384
385 if (savefid != data->currfid) {
386 printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n",
387 data->currfid);
388 return 1;
389 }
390
391 pr_debug("ph1 complete, currfid 0x%x, currvid 0x%x\n",
392 data->currfid, data->currvid);
393
394 return 0;
395}
396
397
398static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
399{
400 u32 vcoreqfid, vcocurrfid, vcofiddiff;
401 u32 fid_interval, savevid = data->currvid;
402
403 if (data->currfid == reqfid) {
404 printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n",
405 data->currfid);
406 return 0;
407 }
408
409 pr_debug("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, "
410 "reqfid 0x%x\n",
411 smp_processor_id(),
412 data->currfid, data->currvid, reqfid);
413
414 vcoreqfid = convert_fid_to_vco_fid(reqfid);
415 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
416 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
417 : vcoreqfid - vcocurrfid;
418
419 if ((reqfid <= LO_FID_TABLE_TOP) && (data->currfid <= LO_FID_TABLE_TOP))
420 vcofiddiff = 0;
421
422 while (vcofiddiff > 2) {
423 (data->currfid & 1) ? (fid_interval = 1) : (fid_interval = 2);
424
425 if (reqfid > data->currfid) {
426 if (data->currfid > LO_FID_TABLE_TOP) {
427 if (write_new_fid(data,
428 data->currfid + fid_interval))
429 return 1;
430 } else {
431 if (write_new_fid
432 (data,
433 2 + convert_fid_to_vco_fid(data->currfid)))
434 return 1;
435 }
436 } else {
437 if (write_new_fid(data, data->currfid - fid_interval))
438 return 1;
439 }
440
441 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
442 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
443 : vcoreqfid - vcocurrfid;
444 }
445
446 if (write_new_fid(data, reqfid))
447 return 1;
448
449 if (query_current_values_with_pending_wait(data))
450 return 1;
451
452 if (data->currfid != reqfid) {
453 printk(KERN_ERR PFX
454 "ph2: mismatch, failed fid transition, "
455 "curr 0x%x, req 0x%x\n",
456 data->currfid, reqfid);
457 return 1;
458 }
459
460 if (savevid != data->currvid) {
461 printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n",
462 savevid, data->currvid);
463 return 1;
464 }
465
466 pr_debug("ph2 complete, currfid 0x%x, currvid 0x%x\n",
467 data->currfid, data->currvid);
468
469 return 0;
470}
471
472
473static int core_voltage_post_transition(struct powernow_k8_data *data,
474 u32 reqvid)
475{
476 u32 savefid = data->currfid;
477 u32 savereqvid = reqvid;
478
479 pr_debug("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
480 smp_processor_id(),
481 data->currfid, data->currvid);
482
483 if (reqvid != data->currvid) {
484 if (write_new_vid(data, reqvid))
485 return 1;
486
487 if (savefid != data->currfid) {
488 printk(KERN_ERR PFX
489 "ph3: bad fid change, save 0x%x, curr 0x%x\n",
490 savefid, data->currfid);
491 return 1;
492 }
493
494 if (data->currvid != reqvid) {
495 printk(KERN_ERR PFX
496 "ph3: failed vid transition\n, "
497 "req 0x%x, curr 0x%x",
498 reqvid, data->currvid);
499 return 1;
500 }
501 }
502
503 if (query_current_values_with_pending_wait(data))
504 return 1;
505
506 if (savereqvid != data->currvid) {
507 pr_debug("ph3 failed, currvid 0x%x\n", data->currvid);
508 return 1;
509 }
510
511 if (savefid != data->currfid) {
512 pr_debug("ph3 failed, currfid changed 0x%x\n",
513 data->currfid);
514 return 1;
515 }
516
517 pr_debug("ph3 complete, currfid 0x%x, currvid 0x%x\n",
518 data->currfid, data->currvid);
519
520 return 0;
521}
522
523static const struct x86_cpu_id powernow_k8_ids[] = {
524
525 { X86_VENDOR_AMD, 0xf },
526
527 X86_FEATURE_MATCH(X86_FEATURE_HW_PSTATE),
528 {}
529};
530MODULE_DEVICE_TABLE(x86cpu, powernow_k8_ids);
531
532static void check_supported_cpu(void *_rc)
533{
534 u32 eax, ebx, ecx, edx;
535 int *rc = _rc;
536
537 *rc = -ENODEV;
538
539 eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
540
541 if ((eax & CPUID_XFAM) == CPUID_XFAM_K8) {
542 if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
543 ((eax & CPUID_XMOD) > CPUID_XMOD_REV_MASK)) {
544 printk(KERN_INFO PFX
545 "Processor cpuid %x not supported\n", eax);
546 return;
547 }
548
549 eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES);
550 if (eax < CPUID_FREQ_VOLT_CAPABILITIES) {
551 printk(KERN_INFO PFX
552 "No frequency change capabilities detected\n");
553 return;
554 }
555
556 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
557 if ((edx & P_STATE_TRANSITION_CAPABLE)
558 != P_STATE_TRANSITION_CAPABLE) {
559 printk(KERN_INFO PFX
560 "Power state transitions not supported\n");
561 return;
562 }
563 } else {
564 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
565 if ((edx & USE_HW_PSTATE) == USE_HW_PSTATE)
566 cpu_family = CPU_HW_PSTATE;
567 else
568 return;
569 }
570
571 *rc = 0;
572}
573
574static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst,
575 u8 maxvid)
576{
577 unsigned int j;
578 u8 lastfid = 0xff;
579
580 for (j = 0; j < data->numps; j++) {
581 if (pst[j].vid > LEAST_VID) {
582 printk(KERN_ERR FW_BUG PFX "vid %d invalid : 0x%x\n",
583 j, pst[j].vid);
584 return -EINVAL;
585 }
586 if (pst[j].vid < data->rvo) {
587
588 printk(KERN_ERR FW_BUG PFX "0 vid exceeded with pstate"
589 " %d\n", j);
590 return -ENODEV;
591 }
592 if (pst[j].vid < maxvid + data->rvo) {
593
594 printk(KERN_ERR FW_BUG PFX "maxvid exceeded with pstate"
595 " %d\n", j);
596 return -ENODEV;
597 }
598 if (pst[j].fid > MAX_FID) {
599 printk(KERN_ERR FW_BUG PFX "maxfid exceeded with pstate"
600 " %d\n", j);
601 return -ENODEV;
602 }
603 if (j && (pst[j].fid < HI_FID_TABLE_BOTTOM)) {
604
605 printk(KERN_ERR FW_BUG PFX "two low fids - %d : "
606 "0x%x\n", j, pst[j].fid);
607 return -EINVAL;
608 }
609 if (pst[j].fid < lastfid)
610 lastfid = pst[j].fid;
611 }
612 if (lastfid & 1) {
613 printk(KERN_ERR FW_BUG PFX "lastfid invalid\n");
614 return -EINVAL;
615 }
616 if (lastfid > LO_FID_TABLE_TOP)
617 printk(KERN_INFO FW_BUG PFX
618 "first fid not from lo freq table\n");
619
620 return 0;
621}
622
623static void invalidate_entry(struct cpufreq_frequency_table *powernow_table,
624 unsigned int entry)
625{
626 powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID;
627}
628
629static void print_basics(struct powernow_k8_data *data)
630{
631 int j;
632 for (j = 0; j < data->numps; j++) {
633 if (data->powernow_table[j].frequency !=
634 CPUFREQ_ENTRY_INVALID) {
635 if (cpu_family == CPU_HW_PSTATE) {
636 printk(KERN_INFO PFX
637 " %d : pstate %d (%d MHz)\n", j,
638 data->powernow_table[j].index,
639 data->powernow_table[j].frequency/1000);
640 } else {
641 printk(KERN_INFO PFX
642 "fid 0x%x (%d MHz), vid 0x%x\n",
643 data->powernow_table[j].index & 0xff,
644 data->powernow_table[j].frequency/1000,
645 data->powernow_table[j].index >> 8);
646 }
647 }
648 }
649 if (data->batps)
650 printk(KERN_INFO PFX "Only %d pstates on battery\n",
651 data->batps);
652}
653
654static u32 freq_from_fid_did(u32 fid, u32 did)
655{
656 u32 mhz = 0;
657
658 if (boot_cpu_data.x86 == 0x10)
659 mhz = (100 * (fid + 0x10)) >> did;
660 else if (boot_cpu_data.x86 == 0x11)
661 mhz = (100 * (fid + 8)) >> did;
662 else
663 BUG();
664
665 return mhz * 1000;
666}
667
668static int fill_powernow_table(struct powernow_k8_data *data,
669 struct pst_s *pst, u8 maxvid)
670{
671 struct cpufreq_frequency_table *powernow_table;
672 unsigned int j;
673
674 if (data->batps) {
675
676 printk(KERN_WARNING PFX
677 "Only %d pstates usable (use ACPI driver for full "
678 "range\n", data->batps);
679 data->numps = data->batps;
680 }
681
682 for (j = 1; j < data->numps; j++) {
683 if (pst[j-1].fid >= pst[j].fid) {
684 printk(KERN_ERR PFX "PST out of sequence\n");
685 return -EINVAL;
686 }
687 }
688
689 if (data->numps < 2) {
690 printk(KERN_ERR PFX "no p states to transition\n");
691 return -ENODEV;
692 }
693
694 if (check_pst_table(data, pst, maxvid))
695 return -EINVAL;
696
697 powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
698 * (data->numps + 1)), GFP_KERNEL);
699 if (!powernow_table) {
700 printk(KERN_ERR PFX "powernow_table memory alloc failure\n");
701 return -ENOMEM;
702 }
703
704 for (j = 0; j < data->numps; j++) {
705 int freq;
706 powernow_table[j].index = pst[j].fid;
707 powernow_table[j].index |= (pst[j].vid << 8);
708 freq = find_khz_freq_from_fid(pst[j].fid);
709 powernow_table[j].frequency = freq;
710 }
711 powernow_table[data->numps].frequency = CPUFREQ_TABLE_END;
712 powernow_table[data->numps].index = 0;
713
714 if (query_current_values_with_pending_wait(data)) {
715 kfree(powernow_table);
716 return -EIO;
717 }
718
719 pr_debug("cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid);
720 data->powernow_table = powernow_table;
721 if (cpumask_first(cpu_core_mask(data->cpu)) == data->cpu)
722 print_basics(data);
723
724 for (j = 0; j < data->numps; j++)
725 if ((pst[j].fid == data->currfid) &&
726 (pst[j].vid == data->currvid))
727 return 0;
728
729 pr_debug("currfid/vid do not match PST, ignoring\n");
730 return 0;
731}
732
733
734static int find_psb_table(struct powernow_k8_data *data)
735{
736 struct psb_s *psb;
737 unsigned int i;
738 u32 mvs;
739 u8 maxvid;
740 u32 cpst = 0;
741 u32 thiscpuid;
742
743 for (i = 0xc0000; i < 0xffff0; i += 0x10) {
744
745
746
747 psb = phys_to_virt(i);
748 if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0)
749 continue;
750
751 pr_debug("found PSB header at 0x%p\n", psb);
752
753 pr_debug("table vers: 0x%x\n", psb->tableversion);
754 if (psb->tableversion != PSB_VERSION_1_4) {
755 printk(KERN_ERR FW_BUG PFX "PSB table is not v1.4\n");
756 return -ENODEV;
757 }
758
759 pr_debug("flags: 0x%x\n", psb->flags1);
760 if (psb->flags1) {
761 printk(KERN_ERR FW_BUG PFX "unknown flags\n");
762 return -ENODEV;
763 }
764
765 data->vstable = psb->vstable;
766 pr_debug("voltage stabilization time: %d(*20us)\n",
767 data->vstable);
768
769 pr_debug("flags2: 0x%x\n", psb->flags2);
770 data->rvo = psb->flags2 & 3;
771 data->irt = ((psb->flags2) >> 2) & 3;
772 mvs = ((psb->flags2) >> 4) & 3;
773 data->vidmvs = 1 << mvs;
774 data->batps = ((psb->flags2) >> 6) & 3;
775
776 pr_debug("ramp voltage offset: %d\n", data->rvo);
777 pr_debug("isochronous relief time: %d\n", data->irt);
778 pr_debug("maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs);
779
780 pr_debug("numpst: 0x%x\n", psb->num_tables);
781 cpst = psb->num_tables;
782 if ((psb->cpuid == 0x00000fc0) ||
783 (psb->cpuid == 0x00000fe0)) {
784 thiscpuid = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
785 if ((thiscpuid == 0x00000fc0) ||
786 (thiscpuid == 0x00000fe0))
787 cpst = 1;
788 }
789 if (cpst != 1) {
790 printk(KERN_ERR FW_BUG PFX "numpst must be 1\n");
791 return -ENODEV;
792 }
793
794 data->plllock = psb->plllocktime;
795 pr_debug("plllocktime: 0x%x (units 1us)\n", psb->plllocktime);
796 pr_debug("maxfid: 0x%x\n", psb->maxfid);
797 pr_debug("maxvid: 0x%x\n", psb->maxvid);
798 maxvid = psb->maxvid;
799
800 data->numps = psb->numps;
801 pr_debug("numpstates: 0x%x\n", data->numps);
802 return fill_powernow_table(data,
803 (struct pst_s *)(psb+1), maxvid);
804 }
805
806
807
808
809
810
811
812
813
814
815
816 printk(KERN_ERR FW_BUG PFX "No PSB or ACPI _PSS objects\n");
817 printk(KERN_ERR PFX "Make sure that your BIOS is up to date"
818 " and Cool'N'Quiet support is enabled in BIOS setup\n");
819 return -ENODEV;
820}
821
822static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data,
823 unsigned int index)
824{
825 u64 control;
826
827 if (!data->acpi_data.state_count || (cpu_family == CPU_HW_PSTATE))
828 return;
829
830 control = data->acpi_data.states[index].control;
831 data->irt = (control >> IRT_SHIFT) & IRT_MASK;
832 data->rvo = (control >> RVO_SHIFT) & RVO_MASK;
833 data->exttype = (control >> EXT_TYPE_SHIFT) & EXT_TYPE_MASK;
834 data->plllock = (control >> PLL_L_SHIFT) & PLL_L_MASK;
835 data->vidmvs = 1 << ((control >> MVS_SHIFT) & MVS_MASK);
836 data->vstable = (control >> VST_SHIFT) & VST_MASK;
837}
838
839static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
840{
841 struct cpufreq_frequency_table *powernow_table;
842 int ret_val = -ENODEV;
843 u64 control, status;
844
845 if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
846 pr_debug("register performance failed: bad ACPI data\n");
847 return -EIO;
848 }
849
850
851 if (data->acpi_data.state_count <= 1) {
852 pr_debug("No ACPI P-States\n");
853 goto err_out;
854 }
855
856 control = data->acpi_data.control_register.space_id;
857 status = data->acpi_data.status_register.space_id;
858
859 if ((control != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
860 (status != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
861 pr_debug("Invalid control/status registers (%llx - %llx)\n",
862 control, status);
863 goto err_out;
864 }
865
866
867 powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
868 * (data->acpi_data.state_count + 1)), GFP_KERNEL);
869 if (!powernow_table) {
870 pr_debug("powernow_table memory alloc failure\n");
871 goto err_out;
872 }
873
874
875 data->numps = data->acpi_data.state_count;
876 powernow_k8_acpi_pst_values(data, 0);
877
878 if (cpu_family == CPU_HW_PSTATE)
879 ret_val = fill_powernow_table_pstate(data, powernow_table);
880 else
881 ret_val = fill_powernow_table_fidvid(data, powernow_table);
882 if (ret_val)
883 goto err_out_mem;
884
885 powernow_table[data->acpi_data.state_count].frequency =
886 CPUFREQ_TABLE_END;
887 powernow_table[data->acpi_data.state_count].index = 0;
888 data->powernow_table = powernow_table;
889
890 if (cpumask_first(cpu_core_mask(data->cpu)) == data->cpu)
891 print_basics(data);
892
893
894 acpi_processor_notify_smm(THIS_MODULE);
895
896 if (!zalloc_cpumask_var(&data->acpi_data.shared_cpu_map, GFP_KERNEL)) {
897 printk(KERN_ERR PFX
898 "unable to alloc powernow_k8_data cpumask\n");
899 ret_val = -ENOMEM;
900 goto err_out_mem;
901 }
902
903 return 0;
904
905err_out_mem:
906 kfree(powernow_table);
907
908err_out:
909 acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
910
911
912
913 data->acpi_data.state_count = 0;
914
915 return ret_val;
916}
917
918static int fill_powernow_table_pstate(struct powernow_k8_data *data,
919 struct cpufreq_frequency_table *powernow_table)
920{
921 int i;
922 u32 hi = 0, lo = 0;
923 rdmsr(MSR_PSTATE_CUR_LIMIT, lo, hi);
924 data->max_hw_pstate = (lo & HW_PSTATE_MAX_MASK) >> HW_PSTATE_MAX_SHIFT;
925
926 for (i = 0; i < data->acpi_data.state_count; i++) {
927 u32 index;
928
929 index = data->acpi_data.states[i].control & HW_PSTATE_MASK;
930 if (index > data->max_hw_pstate) {
931 printk(KERN_ERR PFX "invalid pstate %d - "
932 "bad value %d.\n", i, index);
933 printk(KERN_ERR PFX "Please report to BIOS "
934 "manufacturer\n");
935 invalidate_entry(powernow_table, i);
936 continue;
937 }
938
939 ps_to_as[index] = i;
940
941
942 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
943 || boot_cpu_data.x86 == 0x11) {
944
945 rdmsr(MSR_PSTATE_DEF_BASE + index, lo, hi);
946 if (!(hi & HW_PSTATE_VALID_MASK)) {
947 pr_debug("invalid pstate %d, ignoring\n", index);
948 invalidate_entry(powernow_table, i);
949 continue;
950 }
951
952 powernow_table[i].frequency =
953 freq_from_fid_did(lo & 0x3f, (lo >> 6) & 7);
954 } else
955 powernow_table[i].frequency =
956 data->acpi_data.states[i].core_frequency * 1000;
957
958 powernow_table[i].index = index;
959 }
960 return 0;
961}
962
963static int fill_powernow_table_fidvid(struct powernow_k8_data *data,
964 struct cpufreq_frequency_table *powernow_table)
965{
966 int i;
967
968 for (i = 0; i < data->acpi_data.state_count; i++) {
969 u32 fid;
970 u32 vid;
971 u32 freq, index;
972 u64 status, control;
973
974 if (data->exttype) {
975 status = data->acpi_data.states[i].status;
976 fid = status & EXT_FID_MASK;
977 vid = (status >> VID_SHIFT) & EXT_VID_MASK;
978 } else {
979 control = data->acpi_data.states[i].control;
980 fid = control & FID_MASK;
981 vid = (control >> VID_SHIFT) & VID_MASK;
982 }
983
984 pr_debug(" %d : fid 0x%x, vid 0x%x\n", i, fid, vid);
985
986 index = fid | (vid<<8);
987 powernow_table[i].index = index;
988
989 freq = find_khz_freq_from_fid(fid);
990 powernow_table[i].frequency = freq;
991
992
993 if ((freq > (MAX_FREQ * 1000)) || (freq < (MIN_FREQ * 1000))) {
994 pr_debug("invalid freq %u kHz, ignoring\n", freq);
995 invalidate_entry(powernow_table, i);
996 continue;
997 }
998
999
1000
1001 if (vid == VID_OFF) {
1002 pr_debug("invalid vid %u, ignoring\n", vid);
1003 invalidate_entry(powernow_table, i);
1004 continue;
1005 }
1006
1007 if (freq != (data->acpi_data.states[i].core_frequency * 1000)) {
1008 printk(KERN_INFO PFX "invalid freq entries "
1009 "%u kHz vs. %u kHz\n", freq,
1010 (unsigned int)
1011 (data->acpi_data.states[i].core_frequency
1012 * 1000));
1013 invalidate_entry(powernow_table, i);
1014 continue;
1015 }
1016 }
1017 return 0;
1018}
1019
1020static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
1021{
1022 if (data->acpi_data.state_count)
1023 acpi_processor_unregister_performance(&data->acpi_data,
1024 data->cpu);
1025 free_cpumask_var(data->acpi_data.shared_cpu_map);
1026}
1027
1028static int get_transition_latency(struct powernow_k8_data *data)
1029{
1030 int max_latency = 0;
1031 int i;
1032 for (i = 0; i < data->acpi_data.state_count; i++) {
1033 int cur_latency = data->acpi_data.states[i].transition_latency
1034 + data->acpi_data.states[i].bus_master_latency;
1035 if (cur_latency > max_latency)
1036 max_latency = cur_latency;
1037 }
1038 if (max_latency == 0) {
1039
1040
1041
1042
1043
1044
1045 if (boot_cpu_data.x86 < 0x11)
1046 printk(KERN_ERR FW_WARN PFX "Invalid zero transition "
1047 "latency\n");
1048 max_latency = 1;
1049 }
1050
1051 return 1000 * max_latency;
1052}
1053
1054
1055static int transition_frequency_fidvid(struct powernow_k8_data *data,
1056 unsigned int index)
1057{
1058 u32 fid = 0;
1059 u32 vid = 0;
1060 int res, i;
1061 struct cpufreq_freqs freqs;
1062
1063 pr_debug("cpu %d transition to index %u\n", smp_processor_id(), index);
1064
1065
1066
1067
1068
1069
1070 fid = data->powernow_table[index].index & 0xFF;
1071 vid = (data->powernow_table[index].index & 0xFF00) >> 8;
1072
1073 pr_debug("table matched fid 0x%x, giving vid 0x%x\n", fid, vid);
1074
1075 if (query_current_values_with_pending_wait(data))
1076 return 1;
1077
1078 if ((data->currvid == vid) && (data->currfid == fid)) {
1079 pr_debug("target matches current values (fid 0x%x, vid 0x%x)\n",
1080 fid, vid);
1081 return 0;
1082 }
1083
1084 pr_debug("cpu %d, changing to fid 0x%x, vid 0x%x\n",
1085 smp_processor_id(), fid, vid);
1086 freqs.old = find_khz_freq_from_fid(data->currfid);
1087 freqs.new = find_khz_freq_from_fid(fid);
1088
1089 for_each_cpu(i, data->available_cores) {
1090 freqs.cpu = i;
1091 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
1092 }
1093
1094 res = transition_fid_vid(data, fid, vid);
1095 if (res)
1096 return res;
1097
1098 freqs.new = find_khz_freq_from_fid(data->currfid);
1099
1100 for_each_cpu(i, data->available_cores) {
1101 freqs.cpu = i;
1102 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
1103 }
1104 return res;
1105}
1106
1107
1108static int transition_frequency_pstate(struct powernow_k8_data *data,
1109 unsigned int index)
1110{
1111 u32 pstate = 0;
1112 int res, i;
1113 struct cpufreq_freqs freqs;
1114
1115 pr_debug("cpu %d transition to index %u\n", smp_processor_id(), index);
1116
1117
1118 pstate = index & HW_PSTATE_MASK;
1119 if (pstate > data->max_hw_pstate)
1120 return -EINVAL;
1121
1122 freqs.old = find_khz_freq_from_pstate(data->powernow_table,
1123 data->currpstate);
1124 freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
1125
1126 for_each_cpu(i, data->available_cores) {
1127 freqs.cpu = i;
1128 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
1129 }
1130
1131 res = transition_pstate(data, pstate);
1132 freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
1133
1134 for_each_cpu(i, data->available_cores) {
1135 freqs.cpu = i;
1136 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
1137 }
1138 return res;
1139}
1140
1141struct powernowk8_target_arg {
1142 struct cpufreq_policy *pol;
1143 unsigned targfreq;
1144 unsigned relation;
1145};
1146
1147static long powernowk8_target_fn(void *arg)
1148{
1149 struct powernowk8_target_arg *pta = arg;
1150 struct cpufreq_policy *pol = pta->pol;
1151 unsigned targfreq = pta->targfreq;
1152 unsigned relation = pta->relation;
1153 struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1154 u32 checkfid;
1155 u32 checkvid;
1156 unsigned int newstate;
1157 int ret;
1158
1159 if (!data)
1160 return -EINVAL;
1161
1162 checkfid = data->currfid;
1163 checkvid = data->currvid;
1164
1165 if (pending_bit_stuck()) {
1166 printk(KERN_ERR PFX "failing targ, change pending bit set\n");
1167 return -EIO;
1168 }
1169
1170 pr_debug("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
1171 pol->cpu, targfreq, pol->min, pol->max, relation);
1172
1173 if (query_current_values_with_pending_wait(data))
1174 return -EIO;
1175
1176 if (cpu_family != CPU_HW_PSTATE) {
1177 pr_debug("targ: curr fid 0x%x, vid 0x%x\n",
1178 data->currfid, data->currvid);
1179
1180 if ((checkvid != data->currvid) ||
1181 (checkfid != data->currfid)) {
1182 printk(KERN_INFO PFX
1183 "error - out of sync, fix 0x%x 0x%x, "
1184 "vid 0x%x 0x%x\n",
1185 checkfid, data->currfid,
1186 checkvid, data->currvid);
1187 }
1188 }
1189
1190 if (cpufreq_frequency_table_target(pol, data->powernow_table,
1191 targfreq, relation, &newstate))
1192 return -EIO;
1193
1194 mutex_lock(&fidvid_mutex);
1195
1196 powernow_k8_acpi_pst_values(data, newstate);
1197
1198 if (cpu_family == CPU_HW_PSTATE)
1199 ret = transition_frequency_pstate(data,
1200 data->powernow_table[newstate].index);
1201 else
1202 ret = transition_frequency_fidvid(data, newstate);
1203 if (ret) {
1204 printk(KERN_ERR PFX "transition frequency failed\n");
1205 mutex_unlock(&fidvid_mutex);
1206 return 1;
1207 }
1208 mutex_unlock(&fidvid_mutex);
1209
1210 if (cpu_family == CPU_HW_PSTATE)
1211 pol->cur = find_khz_freq_from_pstate(data->powernow_table,
1212 data->powernow_table[newstate].index);
1213 else
1214 pol->cur = find_khz_freq_from_fid(data->currfid);
1215
1216 return 0;
1217}
1218
1219
1220static int powernowk8_target(struct cpufreq_policy *pol,
1221 unsigned targfreq, unsigned relation)
1222{
1223 struct powernowk8_target_arg pta = { .pol = pol, .targfreq = targfreq,
1224 .relation = relation };
1225
1226
1227
1228
1229
1230 if (smp_processor_id() == pol->cpu)
1231 return powernowk8_target_fn(&pta);
1232 else
1233 return work_on_cpu(pol->cpu, powernowk8_target_fn, &pta);
1234}
1235
1236
1237static int powernowk8_verify(struct cpufreq_policy *pol)
1238{
1239 struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1240
1241 if (!data)
1242 return -EINVAL;
1243
1244 return cpufreq_frequency_table_verify(pol, data->powernow_table);
1245}
1246
1247struct init_on_cpu {
1248 struct powernow_k8_data *data;
1249 int rc;
1250};
1251
1252static void __cpuinit powernowk8_cpu_init_on_cpu(void *_init_on_cpu)
1253{
1254 struct init_on_cpu *init_on_cpu = _init_on_cpu;
1255
1256 if (pending_bit_stuck()) {
1257 printk(KERN_ERR PFX "failing init, change pending bit set\n");
1258 init_on_cpu->rc = -ENODEV;
1259 return;
1260 }
1261
1262 if (query_current_values_with_pending_wait(init_on_cpu->data)) {
1263 init_on_cpu->rc = -ENODEV;
1264 return;
1265 }
1266
1267 if (cpu_family == CPU_OPTERON)
1268 fidvid_msr_init();
1269
1270 init_on_cpu->rc = 0;
1271}
1272
1273
1274static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
1275{
1276 static const char ACPI_PSS_BIOS_BUG_MSG[] =
1277 KERN_ERR FW_BUG PFX "No compatible ACPI _PSS objects found.\n"
1278 FW_BUG PFX "Try again with latest BIOS.\n";
1279 struct powernow_k8_data *data;
1280 struct init_on_cpu init_on_cpu;
1281 int rc;
1282 struct cpuinfo_x86 *c = &cpu_data(pol->cpu);
1283
1284 if (!cpu_online(pol->cpu))
1285 return -ENODEV;
1286
1287 smp_call_function_single(pol->cpu, check_supported_cpu, &rc, 1);
1288 if (rc)
1289 return -ENODEV;
1290
1291 data = kzalloc(sizeof(struct powernow_k8_data), GFP_KERNEL);
1292 if (!data) {
1293 printk(KERN_ERR PFX "unable to alloc powernow_k8_data");
1294 return -ENOMEM;
1295 }
1296
1297 data->cpu = pol->cpu;
1298 data->currpstate = HW_PSTATE_INVALID;
1299
1300 if (powernow_k8_cpu_init_acpi(data)) {
1301
1302
1303
1304
1305 if (num_online_cpus() != 1) {
1306 printk_once(ACPI_PSS_BIOS_BUG_MSG);
1307 goto err_out;
1308 }
1309 if (pol->cpu != 0) {
1310 printk(KERN_ERR FW_BUG PFX "No ACPI _PSS objects for "
1311 "CPU other than CPU0. Complain to your BIOS "
1312 "vendor.\n");
1313 goto err_out;
1314 }
1315 rc = find_psb_table(data);
1316 if (rc)
1317 goto err_out;
1318
1319
1320
1321 pol->cpuinfo.transition_latency = (
1322 ((data->rvo + 8) * data->vstable * VST_UNITS_20US) +
1323 ((1 << data->irt) * 30)) * 1000;
1324 } else
1325 pol->cpuinfo.transition_latency = get_transition_latency(data);
1326
1327
1328 init_on_cpu.data = data;
1329 smp_call_function_single(data->cpu, powernowk8_cpu_init_on_cpu,
1330 &init_on_cpu, 1);
1331 rc = init_on_cpu.rc;
1332 if (rc != 0)
1333 goto err_out_exit_acpi;
1334
1335 if (cpu_family == CPU_HW_PSTATE)
1336 cpumask_copy(pol->cpus, cpumask_of(pol->cpu));
1337 else
1338 cpumask_copy(pol->cpus, cpu_core_mask(pol->cpu));
1339 data->available_cores = pol->cpus;
1340
1341 if (cpu_family == CPU_HW_PSTATE)
1342 pol->cur = find_khz_freq_from_pstate(data->powernow_table,
1343 data->currpstate);
1344 else
1345 pol->cur = find_khz_freq_from_fid(data->currfid);
1346 pr_debug("policy current frequency %d kHz\n", pol->cur);
1347
1348
1349 if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) {
1350 printk(KERN_ERR FW_BUG PFX "invalid powernow_table\n");
1351 powernow_k8_cpu_exit_acpi(data);
1352 kfree(data->powernow_table);
1353 kfree(data);
1354 return -EINVAL;
1355 }
1356
1357
1358 if (cpu_has(c, X86_FEATURE_APERFMPERF))
1359 cpufreq_amd64_driver.getavg = cpufreq_get_measured_perf;
1360
1361 cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
1362
1363 if (cpu_family == CPU_HW_PSTATE)
1364 pr_debug("cpu_init done, current pstate 0x%x\n",
1365 data->currpstate);
1366 else
1367 pr_debug("cpu_init done, current fid 0x%x, vid 0x%x\n",
1368 data->currfid, data->currvid);
1369
1370 per_cpu(powernow_data, pol->cpu) = data;
1371
1372 return 0;
1373
1374err_out_exit_acpi:
1375 powernow_k8_cpu_exit_acpi(data);
1376
1377err_out:
1378 kfree(data);
1379 return -ENODEV;
1380}
1381
1382static int __devexit powernowk8_cpu_exit(struct cpufreq_policy *pol)
1383{
1384 struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1385
1386 if (!data)
1387 return -EINVAL;
1388
1389 powernow_k8_cpu_exit_acpi(data);
1390
1391 cpufreq_frequency_table_put_attr(pol->cpu);
1392
1393 kfree(data->powernow_table);
1394 kfree(data);
1395 per_cpu(powernow_data, pol->cpu) = NULL;
1396
1397 return 0;
1398}
1399
1400static void query_values_on_cpu(void *_err)
1401{
1402 int *err = _err;
1403 struct powernow_k8_data *data = __this_cpu_read(powernow_data);
1404
1405 *err = query_current_values_with_pending_wait(data);
1406}
1407
1408static unsigned int powernowk8_get(unsigned int cpu)
1409{
1410 struct powernow_k8_data *data = per_cpu(powernow_data, cpu);
1411 unsigned int khz = 0;
1412 int err;
1413
1414 if (!data)
1415 return 0;
1416
1417 smp_call_function_single(cpu, query_values_on_cpu, &err, true);
1418 if (err)
1419 goto out;
1420
1421 if (cpu_family == CPU_HW_PSTATE)
1422 khz = find_khz_freq_from_pstate(data->powernow_table,
1423 data->currpstate);
1424 else
1425 khz = find_khz_freq_from_fid(data->currfid);
1426
1427
1428out:
1429 return khz;
1430}
1431
1432static void _cpb_toggle_msrs(bool t)
1433{
1434 int cpu;
1435
1436 get_online_cpus();
1437
1438 rdmsr_on_cpus(cpu_online_mask, MSR_K7_HWCR, msrs);
1439
1440 for_each_cpu(cpu, cpu_online_mask) {
1441 struct msr *reg = per_cpu_ptr(msrs, cpu);
1442 if (t)
1443 reg->l &= ~BIT(25);
1444 else
1445 reg->l |= BIT(25);
1446 }
1447 wrmsr_on_cpus(cpu_online_mask, MSR_K7_HWCR, msrs);
1448
1449 put_online_cpus();
1450}
1451
1452
1453
1454
1455
1456
1457
1458static void cpb_toggle(bool t)
1459{
1460 if (!cpb_capable)
1461 return;
1462
1463 if (t && !cpb_enabled) {
1464 cpb_enabled = true;
1465 _cpb_toggle_msrs(t);
1466 printk(KERN_INFO PFX "Core Boosting enabled.\n");
1467 } else if (!t && cpb_enabled) {
1468 cpb_enabled = false;
1469 _cpb_toggle_msrs(t);
1470 printk(KERN_INFO PFX "Core Boosting disabled.\n");
1471 }
1472}
1473
1474static ssize_t store_cpb(struct cpufreq_policy *policy, const char *buf,
1475 size_t count)
1476{
1477 int ret = -EINVAL;
1478 unsigned long val = 0;
1479
1480 ret = strict_strtoul(buf, 10, &val);
1481 if (!ret && (val == 0 || val == 1) && cpb_capable)
1482 cpb_toggle(val);
1483 else
1484 return -EINVAL;
1485
1486 return count;
1487}
1488
1489static ssize_t show_cpb(struct cpufreq_policy *policy, char *buf)
1490{
1491 return sprintf(buf, "%u\n", cpb_enabled);
1492}
1493
1494#define define_one_rw(_name) \
1495static struct freq_attr _name = \
1496__ATTR(_name, 0644, show_##_name, store_##_name)
1497
1498define_one_rw(cpb);
1499
1500static struct freq_attr *powernow_k8_attr[] = {
1501 &cpufreq_freq_attr_scaling_available_freqs,
1502 &cpb,
1503 NULL,
1504};
1505
1506static struct cpufreq_driver cpufreq_amd64_driver = {
1507 .verify = powernowk8_verify,
1508 .target = powernowk8_target,
1509 .bios_limit = acpi_processor_get_bios_limit,
1510 .init = powernowk8_cpu_init,
1511 .exit = __devexit_p(powernowk8_cpu_exit),
1512 .get = powernowk8_get,
1513 .name = "powernow-k8",
1514 .owner = THIS_MODULE,
1515 .attr = powernow_k8_attr,
1516};
1517
1518
1519
1520
1521
1522
1523
1524static int cpb_notify(struct notifier_block *nb, unsigned long action,
1525 void *hcpu)
1526{
1527 unsigned cpu = (long)hcpu;
1528 u32 lo, hi;
1529
1530 switch (action) {
1531 case CPU_UP_PREPARE:
1532 case CPU_UP_PREPARE_FROZEN:
1533
1534 if (!cpb_enabled) {
1535 rdmsr_on_cpu(cpu, MSR_K7_HWCR, &lo, &hi);
1536 lo |= BIT(25);
1537 wrmsr_on_cpu(cpu, MSR_K7_HWCR, lo, hi);
1538 }
1539 break;
1540
1541 case CPU_DOWN_PREPARE:
1542 case CPU_DOWN_PREPARE_FROZEN:
1543 rdmsr_on_cpu(cpu, MSR_K7_HWCR, &lo, &hi);
1544 lo &= ~BIT(25);
1545 wrmsr_on_cpu(cpu, MSR_K7_HWCR, lo, hi);
1546 break;
1547
1548 default:
1549 break;
1550 }
1551
1552 return NOTIFY_OK;
1553}
1554
1555static struct notifier_block cpb_nb = {
1556 .notifier_call = cpb_notify,
1557};
1558
1559
1560static int __cpuinit powernowk8_init(void)
1561{
1562 unsigned int i, supported_cpus = 0, cpu;
1563 int rv;
1564
1565 if (!x86_match_cpu(powernow_k8_ids))
1566 return -ENODEV;
1567
1568 for_each_online_cpu(i) {
1569 int rc;
1570 smp_call_function_single(i, check_supported_cpu, &rc, 1);
1571 if (rc == 0)
1572 supported_cpus++;
1573 }
1574
1575 if (supported_cpus != num_online_cpus())
1576 return -ENODEV;
1577
1578 printk(KERN_INFO PFX "Found %d %s (%d cpu cores) (" VERSION ")\n",
1579 num_online_nodes(), boot_cpu_data.x86_model_id, supported_cpus);
1580
1581 if (boot_cpu_has(X86_FEATURE_CPB)) {
1582
1583 cpb_capable = true;
1584
1585 msrs = msrs_alloc();
1586 if (!msrs) {
1587 printk(KERN_ERR "%s: Error allocating msrs!\n", __func__);
1588 return -ENOMEM;
1589 }
1590
1591 register_cpu_notifier(&cpb_nb);
1592
1593 rdmsr_on_cpus(cpu_online_mask, MSR_K7_HWCR, msrs);
1594
1595 for_each_cpu(cpu, cpu_online_mask) {
1596 struct msr *reg = per_cpu_ptr(msrs, cpu);
1597 cpb_enabled |= !(!!(reg->l & BIT(25)));
1598 }
1599
1600 printk(KERN_INFO PFX "Core Performance Boosting: %s.\n",
1601 (cpb_enabled ? "on" : "off"));
1602 }
1603
1604 rv = cpufreq_register_driver(&cpufreq_amd64_driver);
1605 if (rv < 0 && boot_cpu_has(X86_FEATURE_CPB)) {
1606 unregister_cpu_notifier(&cpb_nb);
1607 msrs_free(msrs);
1608 msrs = NULL;
1609 }
1610 return rv;
1611}
1612
1613
1614static void __exit powernowk8_exit(void)
1615{
1616 pr_debug("exit\n");
1617
1618 if (boot_cpu_has(X86_FEATURE_CPB)) {
1619 msrs_free(msrs);
1620 msrs = NULL;
1621
1622 unregister_cpu_notifier(&cpb_nb);
1623 }
1624
1625 cpufreq_unregister_driver(&cpufreq_amd64_driver);
1626}
1627
1628MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and "
1629 "Mark Langsdorf <mark.langsdorf@amd.com>");
1630MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1631MODULE_LICENSE("GPL");
1632
1633late_initcall(powernowk8_init);
1634module_exit(powernowk8_exit);
1635
