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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Andreas Herrmannb2bd68e2012-01-06 15:59:33 +01002 * (c) 2003-2012 Advanced Micro Devices, Inc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * 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 *
Andreas Herrmannb2bd68e2012-01-06 15:59:33 +01007 * Maintainer:
8 * Andreas Herrmann <andreas.herrmann3@amd.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 *
10 * Based on the powernow-k7.c module written by Dave Jones.
Dave Jonesf4432c52008-10-20 13:31:45 -040011 * (C) 2003 Dave Jones on behalf of SuSE Labs
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 * (C) 2004 Dominik Brodowski <linux@brodo.de>
Pavel Macheka2531292010-07-18 14:27:13 +020013 * (C) 2004 Pavel Machek <pavel@ucw.cz>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 * Licensed under the terms of the GNU GPL License version 2.
15 * Based upon datasheets & sample CPUs kindly provided by AMD.
16 *
17 * Valuable input gratefully received from Dave Jones, Pavel Machek,
Dave Jones1f729e02006-06-04 19:37:58 -040018 * Dominik Brodowski, Jacob Shin, and others.
Dave Jones065b8072005-05-31 19:03:46 -070019 * Originally developed by Paul Devriendt.
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 *
Andreas Herrmannb2bd68e2012-01-06 15:59:33 +010021 * Processor information obtained from Chapter 9 (Power and Thermal
22 * Management) of the "BIOS and Kernel Developer's Guide (BKDG) for
23 * the AMD Athlon 64 and AMD Opteron Processors" and section "2.x
24 * Power Management" in BKDGs for newer AMD CPU families.
25 *
26 * Tables for specific CPUs can be inferred from AMD's processor
27 * power and thermal data sheets, (e.g. 30417.pdf, 30430.pdf, 43375.pdf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 */
29
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>
Dave Jones065b8072005-05-31 19:03:46 -070037#include <linux/cpumask.h>
Tim Schmielau4e57b682005-10-30 15:03:48 -080038#include <linux/sched.h> /* for current / set_cpus_allowed() */
Dave Jones0e64a0c2009-02-04 14:37:50 -050039#include <linux/io.h>
40#include <linux/delay.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
42#include <asm/msr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <linux/acpi.h>
Ingo Molnar14cc3e22006-03-26 01:37:14 -080045#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#include <acpi/processor.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48#define PFX "powernow-k8: "
Mark Langsdorfc5829cd2007-10-17 16:52:08 -050049#define VERSION "version 2.20.00"
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include "powernow-k8.h"
Mark Langsdorfa2fed572010-03-18 18:41:46 +010051#include "mperf.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
53/* serialize freq changes */
Ingo Molnar14cc3e22006-03-26 01:37:14 -080054static DEFINE_MUTEX(fidvid_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
travis@sgi.com2c6b8c02008-01-30 13:33:11 +010056static DEFINE_PER_CPU(struct powernow_k8_data *, powernow_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Dave Jones1f729e02006-06-04 19:37:58 -040058static int cpu_family = CPU_OPTERON;
59
Andreas Herrmanna8eb2842012-01-06 15:57:55 +010060/* array to map SW pstate number to acpi state */
61static u32 ps_to_as[8];
62
Borislav Petkov73860c62010-03-31 21:56:42 +020063/* core performance boost */
64static bool cpb_capable, cpb_enabled;
65static struct msr __percpu *msrs;
66
Mark Langsdorfa2fed572010-03-18 18:41:46 +010067static struct cpufreq_driver cpufreq_amd64_driver;
68
Dave Jones065b8072005-05-31 19:03:46 -070069#ifndef CONFIG_SMP
Rusty Russell7ad728f2009-03-13 14:49:50 +103070static inline const struct cpumask *cpu_core_mask(int cpu)
71{
72 return cpumask_of(0);
73}
Dave Jones065b8072005-05-31 19:03:46 -070074#endif
75
Linus Torvalds1da177e2005-04-16 15:20:36 -070076/* Return a frequency in MHz, given an input fid */
77static u32 find_freq_from_fid(u32 fid)
78{
79 return 800 + (fid * 100);
80}
81
82/* Return a frequency in KHz, given an input fid */
83static u32 find_khz_freq_from_fid(u32 fid)
84{
85 return 1000 * find_freq_from_fid(fid);
86}
87
Dave Jones0e64a0c2009-02-04 14:37:50 -050088static u32 find_khz_freq_from_pstate(struct cpufreq_frequency_table *data,
Andreas Herrmanna8eb2842012-01-06 15:57:55 +010089 u32 pstate)
Linus Torvalds1da177e2005-04-16 15:20:36 -070090{
Andreas Herrmanna8eb2842012-01-06 15:57:55 +010091 return data[ps_to_as[pstate]].frequency;
Dave Jones1f729e02006-06-04 19:37:58 -040092}
93
Linus Torvalds1da177e2005-04-16 15:20:36 -070094/* Return the vco fid for an input fid
95 *
96 * Each "low" fid has corresponding "high" fid, and you can get to "low" fids
97 * only from corresponding high fids. This returns "high" fid corresponding to
98 * "low" one.
99 */
100static u32 convert_fid_to_vco_fid(u32 fid)
101{
Dave Jones32ee8c32006-02-28 00:43:23 -0500102 if (fid < HI_FID_TABLE_BOTTOM)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 return 8 + (2 * fid);
Dave Jones32ee8c32006-02-28 00:43:23 -0500104 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 return fid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106}
107
108/*
109 * Return 1 if the pending bit is set. Unless we just instructed the processor
110 * to transition to a new state, seeing this bit set is really bad news.
111 */
112static int pending_bit_stuck(void)
113{
114 u32 lo, hi;
115
Langsdorf, Marke7bdd7a2006-06-08 10:30:17 -0500116 if (cpu_family == CPU_HW_PSTATE)
Dave Jones1f729e02006-06-04 19:37:58 -0400117 return 0;
118
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 rdmsr(MSR_FIDVID_STATUS, lo, hi);
120 return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0;
121}
122
123/*
124 * Update the global current fid / vid values from the status msr.
125 * Returns 1 on error.
126 */
127static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
128{
129 u32 lo, hi;
130 u32 i = 0;
131
Langsdorf, Marke7bdd7a2006-06-08 10:30:17 -0500132 if (cpu_family == CPU_HW_PSTATE) {
Naga Chumbalkar532cfee2009-06-11 15:26:48 +0000133 rdmsr(MSR_PSTATE_STATUS, lo, hi);
134 i = lo & HW_PSTATE_MASK;
135 data->currpstate = i;
Andreas Herrmanna266d9f2008-11-21 14:49:25 +0100136
Naga Chumbalkar532cfee2009-06-11 15:26:48 +0000137 /*
138 * a workaround for family 11h erratum 311 might cause
139 * an "out-of-range Pstate if the core is in Pstate-0
140 */
141 if ((boot_cpu_data.x86 == 0x11) && (i >= data->numps))
142 data->currpstate = HW_PSTATE_0;
143
Dave Jones1f729e02006-06-04 19:37:58 -0400144 return 0;
145 }
Dave Jones7153d962005-07-28 09:45:10 -0700146 do {
Dave Jones0213df72005-10-21 17:21:03 -0400147 if (i++ > 10000) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200148 pr_debug("detected change pending stuck\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 return 1;
150 }
151 rdmsr(MSR_FIDVID_STATUS, lo, hi);
Dave Jones7153d962005-07-28 09:45:10 -0700152 } while (lo & MSR_S_LO_CHANGE_PENDING);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
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/* the isochronous relief time */
161static void count_off_irt(struct powernow_k8_data *data)
162{
163 udelay((1 << data->irt) * 10);
164 return;
165}
166
Simon Arlott27b46d72007-10-20 01:13:56 +0200167/* the voltage stabilization time */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168static void count_off_vst(struct powernow_k8_data *data)
169{
170 udelay(data->vstable * VST_UNITS_20US);
171 return;
172}
173
174/* need to init the control msr to a safe value (for each cpu) */
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;
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200185 pr_debug("cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo, hi);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 wrmsr(MSR_FIDVID_CTL, lo, hi);
187}
188
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189/* write the new fid value along with the other control fields to the msr */
190static int write_new_fid(struct powernow_k8_data *data, u32 fid)
191{
192 u32 lo;
193 u32 savevid = data->currvid;
Dave Jones0213df72005-10-21 17:21:03 -0400194 u32 i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
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
Dave Jones0e64a0c2009-02-04 14:37:50 -0500201 lo = fid;
202 lo |= (data->currvid << MSR_C_LO_VID_SHIFT);
203 lo |= MSR_C_LO_INIT_FID_VID;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200205 pr_debug("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 fid, lo, data->plllock * PLL_LOCK_CONVERSION);
207
Dave Jones0213df72005-10-21 17:21:03 -0400208 do {
209 wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
210 if (i++ > 100) {
Dave Jones0e64a0c2009-02-04 14:37:50 -0500211 printk(KERN_ERR PFX
212 "Hardware error - pending bit very stuck - "
213 "no further pstate changes possible\n");
Chris Wright63172cb2005-10-21 16:56:08 -0700214 return 1;
Dave Jones32ee8c32006-02-28 00:43:23 -0500215 }
Dave Jones0213df72005-10-21 17:21:03 -0400216 } while (query_current_values_with_pending_wait(data));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
218 count_off_irt(data);
219
220 if (savevid != data->currvid) {
Dave Jones0e64a0c2009-02-04 14:37:50 -0500221 printk(KERN_ERR PFX
222 "vid change on fid trans, old 0x%x, new 0x%x\n",
223 savevid, data->currvid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 return 1;
225 }
226
227 if (fid != data->currfid) {
Dave Jones0e64a0c2009-02-04 14:37:50 -0500228 printk(KERN_ERR PFX
229 "fid trans failed, fid 0x%x, curr 0x%x\n", fid,
230 data->currfid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 return 1;
232 }
233
234 return 0;
235}
236
237/* Write a new vid to the hardware */
238static int write_new_vid(struct powernow_k8_data *data, u32 vid)
239{
240 u32 lo;
241 u32 savefid = data->currfid;
Dave Jones0213df72005-10-21 17:21:03 -0400242 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243
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
Dave Jones0e64a0c2009-02-04 14:37:50 -0500249 lo = data->currfid;
250 lo |= (vid << MSR_C_LO_VID_SHIFT);
251 lo |= MSR_C_LO_INIT_FID_VID;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200253 pr_debug("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 vid, lo, STOP_GRANT_5NS);
255
Dave Jones0213df72005-10-21 17:21:03 -0400256 do {
257 wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
Dave Jones6df89002005-11-30 13:33:30 -0800258 if (i++ > 100) {
Dave Jones0e64a0c2009-02-04 14:37:50 -0500259 printk(KERN_ERR PFX "internal error - pending bit "
260 "very stuck - no further pstate "
261 "changes possible\n");
Dave Jones6df89002005-11-30 13:33:30 -0800262 return 1;
263 }
Dave Jones0213df72005-10-21 17:21:03 -0400264 } while (query_current_values_with_pending_wait(data));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
266 if (savefid != data->currfid) {
Dave Jones0e64a0c2009-02-04 14:37:50 -0500267 printk(KERN_ERR PFX "fid changed on vid trans, old "
268 "0x%x new 0x%x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 savefid, data->currfid);
270 return 1;
271 }
272
273 if (vid != data->currvid) {
Dave Jones0e64a0c2009-02-04 14:37:50 -0500274 printk(KERN_ERR PFX "vid trans failed, vid 0x%x, "
275 "curr 0x%x\n",
276 vid, data->currvid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 return 1;
278 }
279
280 return 0;
281}
282
283/*
284 * Reduce the vid by the max of step or reqvid.
285 * Decreasing vid codes represent increasing voltages:
Dave Jones841e40b2005-07-28 09:40:04 -0700286 * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of VID_OFF is off.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 */
Dave Jones0e64a0c2009-02-04 14:37:50 -0500288static int decrease_vid_code_by_step(struct powernow_k8_data *data,
289 u32 reqvid, u32 step)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290{
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
Dave Jones1f729e02006-06-04 19:37:58 -0400302/* Change hardware pstate by single MSR write */
303static int transition_pstate(struct powernow_k8_data *data, u32 pstate)
304{
305 wrmsr(MSR_PSTATE_CTRL, pstate, 0);
Mark Langsdorfc5829cd2007-10-17 16:52:08 -0500306 data->currpstate = pstate;
Dave Jones1f729e02006-06-04 19:37:58 -0400307 return 0;
308}
309
310/* Change Opteron/Athlon64 fid and vid, by the 3 phases. */
Dave Jones0e64a0c2009-02-04 14:37:50 -0500311static int transition_fid_vid(struct powernow_k8_data *data,
312 u32 reqfid, u32 reqvid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313{
Mark Langsdorfa2e1b4c2009-07-26 10:55:25 -0500314 if (core_voltage_pre_transition(data, reqvid, reqfid))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 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)) {
Dave Jones0e64a0c2009-02-04 14:37:50 -0500327 printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, "
328 "curr 0x%x 0x%x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 smp_processor_id(),
330 reqfid, reqvid, data->currfid, data->currvid);
331 return 1;
332 }
333
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200334 pr_debug("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 smp_processor_id(), data->currfid, data->currvid);
336
337 return 0;
338}
339
340/* Phase 1 - core voltage transition ... setup voltage */
Dave Jones0e64a0c2009-02-04 14:37:50 -0500341static int core_voltage_pre_transition(struct powernow_k8_data *data,
Mark Langsdorfa2e1b4c2009-07-26 10:55:25 -0500342 u32 reqvid, u32 reqfid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343{
344 u32 rvosteps = data->rvo;
345 u32 savefid = data->currfid;
Mark Langsdorfa2e1b4c2009-07-26 10:55:25 -0500346 u32 maxvid, lo, rvomult = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200348 pr_debug("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, "
Dave Jones0e64a0c2009-02-04 14:37:50 -0500349 "reqvid 0x%x, rvo 0x%x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 smp_processor_id(),
351 data->currfid, data->currvid, reqvid, data->rvo);
352
Mark Langsdorfa2e1b4c2009-07-26 10:55:25 -0500353 if ((savefid < LO_FID_TABLE_TOP) && (reqfid < LO_FID_TABLE_TOP))
354 rvomult = 2;
355 rvosteps *= rvomult;
Dave Jones065b8072005-05-31 19:03:46 -0700356 rdmsr(MSR_FIDVID_STATUS, lo, maxvid);
357 maxvid = 0x1f & (maxvid >> 16);
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200358 pr_debug("ph1 maxvid=0x%x\n", maxvid);
Dave Jones065b8072005-05-31 19:03:46 -0700359 if (reqvid < maxvid) /* lower numbers are higher voltages */
360 reqvid = maxvid;
361
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 while (data->currvid > reqvid) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200363 pr_debug("ph1: curr 0x%x, req vid 0x%x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 data->currvid, reqvid);
365 if (decrease_vid_code_by_step(data, reqvid, data->vidmvs))
366 return 1;
367 }
368
Mark Langsdorfa2e1b4c2009-07-26 10:55:25 -0500369 while ((rvosteps > 0) &&
370 ((rvomult * data->rvo + data->currvid) > reqvid)) {
Dave Jones065b8072005-05-31 19:03:46 -0700371 if (data->currvid == maxvid) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 rvosteps = 0;
373 } else {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200374 pr_debug("ph1: changing vid for rvo, req 0x%x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 data->currvid - 1);
Dave Jones0e64a0c2009-02-04 14:37:50 -0500376 if (decrease_vid_code_by_step(data, data->currvid-1, 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 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) {
Dave Jones0e64a0c2009-02-04 14:37:50 -0500386 printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n",
387 data->currfid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 return 1;
389 }
390
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200391 pr_debug("ph1 complete, currfid 0x%x, currvid 0x%x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 data->currfid, data->currvid);
393
394 return 0;
395}
396
397/* Phase 2 - core frequency transition */
398static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
399{
Dave Jones0e64a0c2009-02-04 14:37:50 -0500400 u32 vcoreqfid, vcocurrfid, vcofiddiff;
401 u32 fid_interval, savevid = data->currvid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 if (data->currfid == reqfid) {
Dave Jones0e64a0c2009-02-04 14:37:50 -0500404 printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n",
405 data->currfid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 return 0;
407 }
408
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200409 pr_debug("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, "
Dave Jones0e64a0c2009-02-04 14:37:50 -0500410 "reqfid 0x%x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 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
Mark Langsdorfa2e1b4c2009-07-26 10:55:25 -0500419 if ((reqfid <= LO_FID_TABLE_TOP) && (data->currfid <= LO_FID_TABLE_TOP))
420 vcofiddiff = 0;
421
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 while (vcofiddiff > 2) {
Langsdorf, Mark019a61b2005-11-29 14:18:03 -0600423 (data->currfid & 1) ? (fid_interval = 1) : (fid_interval = 2);
424
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 if (reqfid > data->currfid) {
426 if (data->currfid > LO_FID_TABLE_TOP) {
Dave Jones0e64a0c2009-02-04 14:37:50 -0500427 if (write_new_fid(data,
428 data->currfid + fid_interval))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 } else {
431 if (write_new_fid
Dave Jones0e64a0c2009-02-04 14:37:50 -0500432 (data,
433 2 + convert_fid_to_vco_fid(data->currfid)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 }
436 } else {
Langsdorf, Mark019a61b2005-11-29 14:18:03 -0600437 if (write_new_fid(data, data->currfid - fid_interval))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 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
Dave Jones0e64a0c2009-02-04 14:37:50 -0500454 "ph2: mismatch, failed fid transition, "
455 "curr 0x%x, req 0x%x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 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
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200466 pr_debug("ph2 complete, currfid 0x%x, currvid 0x%x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 data->currfid, data->currvid);
468
469 return 0;
470}
471
472/* Phase 3 - core voltage transition flow ... jump to the final vid. */
Dave Jones0e64a0c2009-02-04 14:37:50 -0500473static int core_voltage_post_transition(struct powernow_k8_data *data,
474 u32 reqvid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475{
476 u32 savefid = data->currfid;
477 u32 savereqvid = reqvid;
478
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200479 pr_debug("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 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
Dave Jones0e64a0c2009-02-04 14:37:50 -0500496 "ph3: failed vid transition\n, "
497 "req 0x%x, curr 0x%x",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 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) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200507 pr_debug("ph3 failed, currvid 0x%x\n", data->currvid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 return 1;
509 }
510
511 if (savefid != data->currfid) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200512 pr_debug("ph3 failed, currfid changed 0x%x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 data->currfid);
514 return 1;
515 }
516
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200517 pr_debug("ph3 complete, currfid 0x%x, currvid 0x%x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 data->currfid, data->currvid);
519
520 return 0;
521}
522
Rusty Russell1ff6e972009-06-12 20:55:37 +0930523static void check_supported_cpu(void *_rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 u32 eax, ebx, ecx, edx;
Rusty Russell1ff6e972009-06-12 20:55:37 +0930526 int *rc = _rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
Rusty Russell1ff6e972009-06-12 20:55:37 +0930528 *rc = -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
Tejun Heo7b543a52010-12-18 16:30:05 +0100530 if (__this_cpu_read(cpu_info.x86_vendor) != X86_VENDOR_AMD)
Rusty Russell1ff6e972009-06-12 20:55:37 +0930531 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532
533 eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
Dave Jones1f729e02006-06-04 19:37:58 -0400534 if (((eax & CPUID_XFAM) != CPUID_XFAM_K8) &&
535 ((eax & CPUID_XFAM) < CPUID_XFAM_10H))
Rusty Russell1ff6e972009-06-12 20:55:37 +0930536 return;
Dave Jones2c906ae2006-02-28 00:36:32 -0500537
Dave Jones1f729e02006-06-04 19:37:58 -0400538 if ((eax & CPUID_XFAM) == CPUID_XFAM_K8) {
539 if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
Dave Jones99fbe1a2007-05-14 18:27:29 -0400540 ((eax & CPUID_XMOD) > CPUID_XMOD_REV_MASK)) {
Dave Jones0e64a0c2009-02-04 14:37:50 -0500541 printk(KERN_INFO PFX
542 "Processor cpuid %x not supported\n", eax);
Rusty Russell1ff6e972009-06-12 20:55:37 +0930543 return;
Dave Jones1f729e02006-06-04 19:37:58 -0400544 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545
Dave Jones1f729e02006-06-04 19:37:58 -0400546 eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES);
547 if (eax < CPUID_FREQ_VOLT_CAPABILITIES) {
548 printk(KERN_INFO PFX
549 "No frequency change capabilities detected\n");
Rusty Russell1ff6e972009-06-12 20:55:37 +0930550 return;
Dave Jones1f729e02006-06-04 19:37:58 -0400551 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552
Dave Jones1f729e02006-06-04 19:37:58 -0400553 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
Dave Jones0e64a0c2009-02-04 14:37:50 -0500554 if ((edx & P_STATE_TRANSITION_CAPABLE)
555 != P_STATE_TRANSITION_CAPABLE) {
556 printk(KERN_INFO PFX
557 "Power state transitions not supported\n");
Rusty Russell1ff6e972009-06-12 20:55:37 +0930558 return;
Dave Jones1f729e02006-06-04 19:37:58 -0400559 }
560 } else { /* must be a HW Pstate capable processor */
561 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
562 if ((edx & USE_HW_PSTATE) == USE_HW_PSTATE)
563 cpu_family = CPU_HW_PSTATE;
564 else
Rusty Russell1ff6e972009-06-12 20:55:37 +0930565 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 }
567
Rusty Russell1ff6e972009-06-12 20:55:37 +0930568 *rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569}
570
Dave Jones0e64a0c2009-02-04 14:37:50 -0500571static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst,
572 u8 maxvid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573{
574 unsigned int j;
575 u8 lastfid = 0xff;
576
577 for (j = 0; j < data->numps; j++) {
578 if (pst[j].vid > LEAST_VID) {
Thomas Renninger2fd47092008-09-01 14:27:03 +0200579 printk(KERN_ERR FW_BUG PFX "vid %d invalid : 0x%x\n",
580 j, pst[j].vid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 return -EINVAL;
582 }
Dave Jones0e64a0c2009-02-04 14:37:50 -0500583 if (pst[j].vid < data->rvo) {
584 /* vid + rvo >= 0 */
Thomas Renninger2fd47092008-09-01 14:27:03 +0200585 printk(KERN_ERR FW_BUG PFX "0 vid exceeded with pstate"
586 " %d\n", j);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 return -ENODEV;
588 }
Dave Jones0e64a0c2009-02-04 14:37:50 -0500589 if (pst[j].vid < maxvid + data->rvo) {
590 /* vid + rvo >= maxvid */
Thomas Renninger2fd47092008-09-01 14:27:03 +0200591 printk(KERN_ERR FW_BUG PFX "maxvid exceeded with pstate"
592 " %d\n", j);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 return -ENODEV;
594 }
Jacob Shin8aae8282005-11-21 07:23:08 -0800595 if (pst[j].fid > MAX_FID) {
Thomas Renninger2fd47092008-09-01 14:27:03 +0200596 printk(KERN_ERR FW_BUG PFX "maxfid exceeded with pstate"
597 " %d\n", j);
Jacob Shin8aae8282005-11-21 07:23:08 -0800598 return -ENODEV;
599 }
Jacob Shin8aae8282005-11-21 07:23:08 -0800600 if (j && (pst[j].fid < HI_FID_TABLE_BOTTOM)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 /* Only first fid is allowed to be in "low" range */
Thomas Renninger2fd47092008-09-01 14:27:03 +0200602 printk(KERN_ERR FW_BUG PFX "two low fids - %d : "
603 "0x%x\n", j, pst[j].fid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 return -EINVAL;
605 }
606 if (pst[j].fid < lastfid)
607 lastfid = pst[j].fid;
608 }
609 if (lastfid & 1) {
Thomas Renninger2fd47092008-09-01 14:27:03 +0200610 printk(KERN_ERR FW_BUG PFX "lastfid invalid\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 return -EINVAL;
612 }
613 if (lastfid > LO_FID_TABLE_TOP)
Dave Jones0e64a0c2009-02-04 14:37:50 -0500614 printk(KERN_INFO FW_BUG PFX
615 "first fid not from lo freq table\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616
617 return 0;
618}
619
Kurt Roeckxf0adb132009-09-16 11:09:32 -0400620static void invalidate_entry(struct cpufreq_frequency_table *powernow_table,
621 unsigned int entry)
Dave Jones0e64a0c2009-02-04 14:37:50 -0500622{
Kurt Roeckxf0adb132009-09-16 11:09:32 -0400623 powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID;
Dave Jones0e64a0c2009-02-04 14:37:50 -0500624}
625
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626static void print_basics(struct powernow_k8_data *data)
627{
628 int j;
629 for (j = 0; j < data->numps; j++) {
Dave Jones0e64a0c2009-02-04 14:37:50 -0500630 if (data->powernow_table[j].frequency !=
631 CPUFREQ_ENTRY_INVALID) {
Langsdorf, Marke7bdd7a2006-06-08 10:30:17 -0500632 if (cpu_family == CPU_HW_PSTATE) {
Dave Jones0e64a0c2009-02-04 14:37:50 -0500633 printk(KERN_INFO PFX
634 " %d : pstate %d (%d MHz)\n", j,
Yinghai Lu4ae5c492007-11-20 19:38:27 -0800635 data->powernow_table[j].index,
Dave Jones9a60ddb2007-07-13 01:34:10 -0400636 data->powernow_table[j].frequency/1000);
Dave Jones1f729e02006-06-04 19:37:58 -0400637 } else {
Dave Jones0e64a0c2009-02-04 14:37:50 -0500638 printk(KERN_INFO PFX
Thomas Renninger9e918692011-03-03 21:31:24 +0100639 "fid 0x%x (%d MHz), vid 0x%x\n",
Dave Jones9a60ddb2007-07-13 01:34:10 -0400640 data->powernow_table[j].index & 0xff,
641 data->powernow_table[j].frequency/1000,
642 data->powernow_table[j].index >> 8);
Dave Jones1f729e02006-06-04 19:37:58 -0400643 }
644 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 }
646 if (data->batps)
Dave Jones0e64a0c2009-02-04 14:37:50 -0500647 printk(KERN_INFO PFX "Only %d pstates on battery\n",
648 data->batps);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649}
650
Andreas Herrmannca446d02009-04-22 13:48:33 +0200651static u32 freq_from_fid_did(u32 fid, u32 did)
652{
653 u32 mhz = 0;
654
655 if (boot_cpu_data.x86 == 0x10)
656 mhz = (100 * (fid + 0x10)) >> did;
657 else if (boot_cpu_data.x86 == 0x11)
658 mhz = (100 * (fid + 8)) >> did;
659 else
660 BUG();
661
662 return mhz * 1000;
663}
664
Dave Jones0e64a0c2009-02-04 14:37:50 -0500665static int fill_powernow_table(struct powernow_k8_data *data,
666 struct pst_s *pst, u8 maxvid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667{
668 struct cpufreq_frequency_table *powernow_table;
669 unsigned int j;
670
Dave Jones0e64a0c2009-02-04 14:37:50 -0500671 if (data->batps) {
672 /* use ACPI support to get full speed on mains power */
673 printk(KERN_WARNING PFX
674 "Only %d pstates usable (use ACPI driver for full "
675 "range\n", data->batps);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 data->numps = data->batps;
677 }
678
Dave Jones0e64a0c2009-02-04 14:37:50 -0500679 for (j = 1; j < data->numps; j++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680 if (pst[j-1].fid >= pst[j].fid) {
681 printk(KERN_ERR PFX "PST out of sequence\n");
682 return -EINVAL;
683 }
684 }
685
686 if (data->numps < 2) {
687 printk(KERN_ERR PFX "no p states to transition\n");
688 return -ENODEV;
689 }
690
691 if (check_pst_table(data, pst, maxvid))
692 return -EINVAL;
693
694 powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
695 * (data->numps + 1)), GFP_KERNEL);
696 if (!powernow_table) {
697 printk(KERN_ERR PFX "powernow_table memory alloc failure\n");
698 return -ENOMEM;
699 }
700
701 for (j = 0; j < data->numps; j++) {
Dave Jones0e64a0c2009-02-04 14:37:50 -0500702 int freq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 powernow_table[j].index = pst[j].fid; /* lower 8 bits */
704 powernow_table[j].index |= (pst[j].vid << 8); /* upper 8 bits */
Dave Jones0e64a0c2009-02-04 14:37:50 -0500705 freq = find_khz_freq_from_fid(pst[j].fid);
706 powernow_table[j].frequency = freq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 }
708 powernow_table[data->numps].frequency = CPUFREQ_TABLE_END;
709 powernow_table[data->numps].index = 0;
710
711 if (query_current_values_with_pending_wait(data)) {
712 kfree(powernow_table);
713 return -EIO;
714 }
715
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200716 pr_debug("cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 data->powernow_table = powernow_table;
Rusty Russell7ad728f2009-03-13 14:49:50 +1030718 if (cpumask_first(cpu_core_mask(data->cpu)) == data->cpu)
Mark Langsdorf2e497622007-04-30 14:15:05 -0500719 print_basics(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720
721 for (j = 0; j < data->numps; j++)
Dave Jones0e64a0c2009-02-04 14:37:50 -0500722 if ((pst[j].fid == data->currfid) &&
723 (pst[j].vid == data->currvid))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 return 0;
725
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200726 pr_debug("currfid/vid do not match PST, ignoring\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 return 0;
728}
729
730/* Find and validate the PSB/PST table in BIOS. */
731static int find_psb_table(struct powernow_k8_data *data)
732{
733 struct psb_s *psb;
734 unsigned int i;
735 u32 mvs;
736 u8 maxvid;
737 u32 cpst = 0;
738 u32 thiscpuid;
739
740 for (i = 0xc0000; i < 0xffff0; i += 0x10) {
741 /* Scan BIOS looking for the signature. */
742 /* It can not be at ffff0 - it is too big. */
743
744 psb = phys_to_virt(i);
745 if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0)
746 continue;
747
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200748 pr_debug("found PSB header at 0x%p\n", psb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200750 pr_debug("table vers: 0x%x\n", psb->tableversion);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 if (psb->tableversion != PSB_VERSION_1_4) {
Thomas Renninger2fd47092008-09-01 14:27:03 +0200752 printk(KERN_ERR FW_BUG PFX "PSB table is not v1.4\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 return -ENODEV;
754 }
755
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200756 pr_debug("flags: 0x%x\n", psb->flags1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 if (psb->flags1) {
Thomas Renninger2fd47092008-09-01 14:27:03 +0200758 printk(KERN_ERR FW_BUG PFX "unknown flags\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 return -ENODEV;
760 }
761
762 data->vstable = psb->vstable;
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200763 pr_debug("voltage stabilization time: %d(*20us)\n",
Dave Jones0e64a0c2009-02-04 14:37:50 -0500764 data->vstable);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200766 pr_debug("flags2: 0x%x\n", psb->flags2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 data->rvo = psb->flags2 & 3;
768 data->irt = ((psb->flags2) >> 2) & 3;
769 mvs = ((psb->flags2) >> 4) & 3;
770 data->vidmvs = 1 << mvs;
771 data->batps = ((psb->flags2) >> 6) & 3;
772
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200773 pr_debug("ramp voltage offset: %d\n", data->rvo);
774 pr_debug("isochronous relief time: %d\n", data->irt);
775 pr_debug("maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200777 pr_debug("numpst: 0x%x\n", psb->num_tables);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 cpst = psb->num_tables;
Dave Jones0e64a0c2009-02-04 14:37:50 -0500779 if ((psb->cpuid == 0x00000fc0) ||
780 (psb->cpuid == 0x00000fe0)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 thiscpuid = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
Dave Jones0e64a0c2009-02-04 14:37:50 -0500782 if ((thiscpuid == 0x00000fc0) ||
783 (thiscpuid == 0x00000fe0))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 cpst = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 }
786 if (cpst != 1) {
Thomas Renninger2fd47092008-09-01 14:27:03 +0200787 printk(KERN_ERR FW_BUG PFX "numpst must be 1\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 return -ENODEV;
789 }
790
791 data->plllock = psb->plllocktime;
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200792 pr_debug("plllocktime: 0x%x (units 1us)\n", psb->plllocktime);
793 pr_debug("maxfid: 0x%x\n", psb->maxfid);
794 pr_debug("maxvid: 0x%x\n", psb->maxvid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 maxvid = psb->maxvid;
796
797 data->numps = psb->numps;
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200798 pr_debug("numpstates: 0x%x\n", data->numps);
Dave Jones0e64a0c2009-02-04 14:37:50 -0500799 return fill_powernow_table(data,
800 (struct pst_s *)(psb+1), maxvid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 }
802 /*
803 * If you see this message, complain to BIOS manufacturer. If
804 * he tells you "we do not support Linux" or some similar
805 * nonsense, remember that Windows 2000 uses the same legacy
806 * mechanism that the old Linux PSB driver uses. Tell them it
807 * is broken with Windows 2000.
808 *
809 * The reference to the AMD documentation is chapter 9 in the
810 * BIOS and Kernel Developer's Guide, which is available on
811 * www.amd.com
812 */
Thomas Renninger79cc56a2009-02-04 11:56:11 +0100813 printk(KERN_ERR FW_BUG PFX "No PSB or ACPI _PSS objects\n");
Marti Raudsepp298decf2010-01-20 19:19:33 +0200814 printk(KERN_ERR PFX "Make sure that your BIOS is up to date"
815 " and Cool'N'Quiet support is enabled in BIOS setup\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 return -ENODEV;
817}
818
Dave Jones0e64a0c2009-02-04 14:37:50 -0500819static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data,
820 unsigned int index)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821{
Lin Ming439913f2010-01-28 10:53:19 +0800822 u64 control;
Dave Jones0e64a0c2009-02-04 14:37:50 -0500823
Linus Torvaldsf607e3a2008-08-19 13:34:59 -0700824 if (!data->acpi_data.state_count || (cpu_family == CPU_HW_PSTATE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 return;
826
Luis Henriques21335d02009-04-23 19:45:04 +0100827 control = data->acpi_data.states[index].control;
828 data->irt = (control >> IRT_SHIFT) & IRT_MASK;
829 data->rvo = (control >> RVO_SHIFT) & RVO_MASK;
830 data->exttype = (control >> EXT_TYPE_SHIFT) & EXT_TYPE_MASK;
831 data->plllock = (control >> PLL_L_SHIFT) & PLL_L_MASK;
832 data->vidmvs = 1 << ((control >> MVS_SHIFT) & MVS_MASK);
833 data->vstable = (control >> VST_SHIFT) & VST_MASK;
834}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835
836static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
837{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 struct cpufreq_frequency_table *powernow_table;
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800839 int ret_val = -ENODEV;
Lin Ming439913f2010-01-28 10:53:19 +0800840 u64 control, status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841
Linus Torvaldsf607e3a2008-08-19 13:34:59 -0700842 if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200843 pr_debug("register performance failed: bad ACPI data\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844 return -EIO;
845 }
846
847 /* verify the data contained in the ACPI structures */
Linus Torvaldsf607e3a2008-08-19 13:34:59 -0700848 if (data->acpi_data.state_count <= 1) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200849 pr_debug("No ACPI P-States\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 goto err_out;
851 }
852
Dave Jones2c701b12009-06-05 12:37:07 -0400853 control = data->acpi_data.control_register.space_id;
854 status = data->acpi_data.status_register.space_id;
855
856 if ((control != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
857 (status != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200858 pr_debug("Invalid control/status registers (%llx - %llx)\n",
Dave Jones2c701b12009-06-05 12:37:07 -0400859 control, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 goto err_out;
861 }
862
863 /* fill in data->powernow_table */
864 powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
Linus Torvaldsf607e3a2008-08-19 13:34:59 -0700865 * (data->acpi_data.state_count + 1)), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 if (!powernow_table) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200867 pr_debug("powernow_table memory alloc failure\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 goto err_out;
869 }
870
Mark Langsdorfdb39d552009-08-21 19:15:28 -0500871 /* fill in data */
872 data->numps = data->acpi_data.state_count;
873 powernow_k8_acpi_pst_values(data, 0);
874
Langsdorf, Marke7bdd7a2006-06-08 10:30:17 -0500875 if (cpu_family == CPU_HW_PSTATE)
Dave Jones1f729e02006-06-04 19:37:58 -0400876 ret_val = fill_powernow_table_pstate(data, powernow_table);
877 else
878 ret_val = fill_powernow_table_fidvid(data, powernow_table);
879 if (ret_val)
880 goto err_out_mem;
881
Dave Jones0e64a0c2009-02-04 14:37:50 -0500882 powernow_table[data->acpi_data.state_count].frequency =
883 CPUFREQ_TABLE_END;
Linus Torvaldsf607e3a2008-08-19 13:34:59 -0700884 powernow_table[data->acpi_data.state_count].index = 0;
Dave Jones1f729e02006-06-04 19:37:58 -0400885 data->powernow_table = powernow_table;
886
Rusty Russell7ad728f2009-03-13 14:49:50 +1030887 if (cpumask_first(cpu_core_mask(data->cpu)) == data->cpu)
Mark Langsdorf2e497622007-04-30 14:15:05 -0500888 print_basics(data);
Dave Jones1f729e02006-06-04 19:37:58 -0400889
890 /* notify BIOS that we exist */
891 acpi_processor_notify_smm(THIS_MODULE);
892
Yinghai Lueaa95842009-06-06 14:51:36 -0700893 if (!zalloc_cpumask_var(&data->acpi_data.shared_cpu_map, GFP_KERNEL)) {
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800894 printk(KERN_ERR PFX
895 "unable to alloc powernow_k8_data cpumask\n");
896 ret_val = -ENOMEM;
897 goto err_out_mem;
898 }
899
Dave Jones1f729e02006-06-04 19:37:58 -0400900 return 0;
901
902err_out_mem:
903 kfree(powernow_table);
904
905err_out:
Linus Torvaldsf607e3a2008-08-19 13:34:59 -0700906 acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
Dave Jones1f729e02006-06-04 19:37:58 -0400907
Dave Jones0e64a0c2009-02-04 14:37:50 -0500908 /* data->acpi_data.state_count informs us at ->exit()
909 * whether ACPI was used */
Linus Torvaldsf607e3a2008-08-19 13:34:59 -0700910 data->acpi_data.state_count = 0;
Dave Jones1f729e02006-06-04 19:37:58 -0400911
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800912 return ret_val;
Dave Jones1f729e02006-06-04 19:37:58 -0400913}
914
Dave Jones0e64a0c2009-02-04 14:37:50 -0500915static int fill_powernow_table_pstate(struct powernow_k8_data *data,
916 struct cpufreq_frequency_table *powernow_table)
Dave Jones1f729e02006-06-04 19:37:58 -0400917{
918 int i;
Mark Langsdorfc5829cd2007-10-17 16:52:08 -0500919 u32 hi = 0, lo = 0;
Borislav Petkovb30d3302010-07-08 18:05:14 +0200920 rdmsr(MSR_PSTATE_CUR_LIMIT, lo, hi);
921 data->max_hw_pstate = (lo & HW_PSTATE_MAX_MASK) >> HW_PSTATE_MAX_SHIFT;
Dave Jones1f729e02006-06-04 19:37:58 -0400922
Linus Torvaldsf607e3a2008-08-19 13:34:59 -0700923 for (i = 0; i < data->acpi_data.state_count; i++) {
Dave Jones1f729e02006-06-04 19:37:58 -0400924 u32 index;
Dave Jones1f729e02006-06-04 19:37:58 -0400925
Linus Torvaldsf607e3a2008-08-19 13:34:59 -0700926 index = data->acpi_data.states[i].control & HW_PSTATE_MASK;
Mark Langsdorfc5829cd2007-10-17 16:52:08 -0500927 if (index > data->max_hw_pstate) {
Dave Jones0e64a0c2009-02-04 14:37:50 -0500928 printk(KERN_ERR PFX "invalid pstate %d - "
929 "bad value %d.\n", i, index);
930 printk(KERN_ERR PFX "Please report to BIOS "
931 "manufacturer\n");
Kurt Roeckxf0adb132009-09-16 11:09:32 -0400932 invalidate_entry(powernow_table, i);
Mark Langsdorfc5829cd2007-10-17 16:52:08 -0500933 continue;
Dave Jones1f729e02006-06-04 19:37:58 -0400934 }
Andreas Herrmanna8eb2842012-01-06 15:57:55 +0100935
936 ps_to_as[index] = i;
937
Andreas Herrmannca446d02009-04-22 13:48:33 +0200938 /* Frequency may be rounded for these */
Mark Langsdorf67937062010-03-31 21:56:45 +0200939 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
940 || boot_cpu_data.x86 == 0x11) {
Andreas Herrmann201bf0f2012-01-06 15:56:31 +0100941
942 rdmsr(MSR_PSTATE_DEF_BASE + index, lo, hi);
943 if (!(hi & HW_PSTATE_VALID_MASK)) {
944 pr_debug("invalid pstate %d, ignoring\n", index);
945 invalidate_entry(powernow_table, i);
946 continue;
947 }
948
Andreas Herrmannca446d02009-04-22 13:48:33 +0200949 powernow_table[i].frequency =
950 freq_from_fid_did(lo & 0x3f, (lo >> 6) & 7);
951 } else
952 powernow_table[i].frequency =
953 data->acpi_data.states[i].core_frequency * 1000;
Andreas Herrmann201bf0f2012-01-06 15:56:31 +0100954
955 powernow_table[i].index = index;
Dave Jones1f729e02006-06-04 19:37:58 -0400956 }
957 return 0;
958}
959
Dave Jones0e64a0c2009-02-04 14:37:50 -0500960static int fill_powernow_table_fidvid(struct powernow_k8_data *data,
961 struct cpufreq_frequency_table *powernow_table)
Dave Jones1f729e02006-06-04 19:37:58 -0400962{
963 int i;
Dave Jones0e64a0c2009-02-04 14:37:50 -0500964
Linus Torvaldsf607e3a2008-08-19 13:34:59 -0700965 for (i = 0; i < data->acpi_data.state_count; i++) {
Dave Jones094ce7f2005-07-29 12:55:40 -0700966 u32 fid;
967 u32 vid;
Dave Jones0e64a0c2009-02-04 14:37:50 -0500968 u32 freq, index;
Lin Ming439913f2010-01-28 10:53:19 +0800969 u64 status, control;
Dave Jones094ce7f2005-07-29 12:55:40 -0700970
971 if (data->exttype) {
Dave Jones0e64a0c2009-02-04 14:37:50 -0500972 status = data->acpi_data.states[i].status;
973 fid = status & EXT_FID_MASK;
974 vid = (status >> VID_SHIFT) & EXT_VID_MASK;
Dave Jones841e40b2005-07-28 09:40:04 -0700975 } else {
Dave Jones0e64a0c2009-02-04 14:37:50 -0500976 control = data->acpi_data.states[i].control;
977 fid = control & FID_MASK;
978 vid = (control >> VID_SHIFT) & VID_MASK;
Dave Jones841e40b2005-07-28 09:40:04 -0700979 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200981 pr_debug(" %d : fid 0x%x, vid 0x%x\n", i, fid, vid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982
Dave Jones0e64a0c2009-02-04 14:37:50 -0500983 index = fid | (vid<<8);
984 powernow_table[i].index = index;
985
986 freq = find_khz_freq_from_fid(fid);
987 powernow_table[i].frequency = freq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988
989 /* verify frequency is OK */
Dave Jones0e64a0c2009-02-04 14:37:50 -0500990 if ((freq > (MAX_FREQ * 1000)) || (freq < (MIN_FREQ * 1000))) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200991 pr_debug("invalid freq %u kHz, ignoring\n", freq);
Kurt Roeckxf0adb132009-09-16 11:09:32 -0400992 invalidate_entry(powernow_table, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993 continue;
994 }
995
Dave Jones0e64a0c2009-02-04 14:37:50 -0500996 /* verify voltage is OK -
997 * BIOSs are using "off" to indicate invalid */
Dave Jones841e40b2005-07-28 09:40:04 -0700998 if (vid == VID_OFF) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200999 pr_debug("invalid vid %u, ignoring\n", vid);
Kurt Roeckxf0adb132009-09-16 11:09:32 -04001000 invalidate_entry(powernow_table, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 continue;
1002 }
1003
Dave Jones0e64a0c2009-02-04 14:37:50 -05001004 if (freq != (data->acpi_data.states[i].core_frequency * 1000)) {
1005 printk(KERN_INFO PFX "invalid freq entries "
1006 "%u kHz vs. %u kHz\n", freq,
1007 (unsigned int)
1008 (data->acpi_data.states[i].core_frequency
1009 * 1000));
Kurt Roeckxf0adb132009-09-16 11:09:32 -04001010 invalidate_entry(powernow_table, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 continue;
1012 }
1013 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015}
1016
1017static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
1018{
Linus Torvaldsf607e3a2008-08-19 13:34:59 -07001019 if (data->acpi_data.state_count)
Dave Jones0e64a0c2009-02-04 14:37:50 -05001020 acpi_processor_unregister_performance(&data->acpi_data,
1021 data->cpu);
Rusty Russell2fdf66b2008-12-31 18:08:47 -08001022 free_cpumask_var(data->acpi_data.shared_cpu_map);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023}
1024
Mark Langsdorf732553e2009-02-03 17:46:43 +01001025static int get_transition_latency(struct powernow_k8_data *data)
1026{
1027 int max_latency = 0;
1028 int i;
1029 for (i = 0; i < data->acpi_data.state_count; i++) {
1030 int cur_latency = data->acpi_data.states[i].transition_latency
1031 + data->acpi_data.states[i].bus_master_latency;
1032 if (cur_latency > max_latency)
1033 max_latency = cur_latency;
1034 }
Thomas Renninger86e13682009-04-22 13:48:30 +02001035 if (max_latency == 0) {
1036 /*
Borislav Petkovc2f4a2c2010-07-08 17:55:30 +02001037 * Fam 11h and later may return 0 as transition latency. This
1038 * is intended and means "very fast". While cpufreq core and
1039 * governors currently can handle that gracefully, better set it
1040 * to 1 to avoid problems in the future.
Thomas Renninger86e13682009-04-22 13:48:30 +02001041 */
Borislav Petkovc2f4a2c2010-07-08 17:55:30 +02001042 if (boot_cpu_data.x86 < 0x11)
Thomas Renninger86e13682009-04-22 13:48:30 +02001043 printk(KERN_ERR FW_WARN PFX "Invalid zero transition "
1044 "latency\n");
1045 max_latency = 1;
1046 }
Mark Langsdorf732553e2009-02-03 17:46:43 +01001047 /* value in usecs, needs to be in nanoseconds */
1048 return 1000 * max_latency;
1049}
1050
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051/* Take a frequency, and issue the fid/vid transition command */
Dave Jones0e64a0c2009-02-04 14:37:50 -05001052static int transition_frequency_fidvid(struct powernow_k8_data *data,
1053 unsigned int index)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054{
Dave Jones1f729e02006-06-04 19:37:58 -04001055 u32 fid = 0;
1056 u32 vid = 0;
Dave Jones065b8072005-05-31 19:03:46 -07001057 int res, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 struct cpufreq_freqs freqs;
1059
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +02001060 pr_debug("cpu %d transition to index %u\n", smp_processor_id(), index);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061
Dave Jones1f729e02006-06-04 19:37:58 -04001062 /* fid/vid correctness check for k8 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 /* fid are the lower 8 bits of the index we stored into
Dave Jones1f729e02006-06-04 19:37:58 -04001064 * the cpufreq frequency table in find_psb_table, vid
1065 * are the upper 8 bits.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067 fid = data->powernow_table[index].index & 0xFF;
1068 vid = (data->powernow_table[index].index & 0xFF00) >> 8;
1069
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +02001070 pr_debug("table matched fid 0x%x, giving vid 0x%x\n", fid, vid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071
1072 if (query_current_values_with_pending_wait(data))
1073 return 1;
1074
1075 if ((data->currvid == vid) && (data->currfid == fid)) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +02001076 pr_debug("target matches current values (fid 0x%x, vid 0x%x)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 fid, vid);
1078 return 0;
1079 }
1080
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +02001081 pr_debug("cpu %d, changing to fid 0x%x, vid 0x%x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 smp_processor_id(), fid, vid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 freqs.old = find_khz_freq_from_fid(data->currfid);
1084 freqs.new = find_khz_freq_from_fid(fid);
Dave Jones1f729e02006-06-04 19:37:58 -04001085
Rusty Russell8e7c2592009-06-12 20:58:37 +09301086 for_each_cpu(i, data->available_cores) {
Dave Jones065b8072005-05-31 19:03:46 -07001087 freqs.cpu = i;
1088 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
1089 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091 res = transition_fid_vid(data, fid, vid);
Konrad Rzeszutek Wilka9d3d202011-06-16 15:36:39 -04001092 if (res)
1093 return res;
1094
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 freqs.new = find_khz_freq_from_fid(data->currfid);
Dave Jones1f729e02006-06-04 19:37:58 -04001096
Rusty Russell8e7c2592009-06-12 20:58:37 +09301097 for_each_cpu(i, data->available_cores) {
Dave Jones1f729e02006-06-04 19:37:58 -04001098 freqs.cpu = i;
1099 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
1100 }
1101 return res;
1102}
1103
1104/* Take a frequency, and issue the hardware pstate transition command */
Dave Jones0e64a0c2009-02-04 14:37:50 -05001105static int transition_frequency_pstate(struct powernow_k8_data *data,
1106 unsigned int index)
Dave Jones1f729e02006-06-04 19:37:58 -04001107{
Dave Jones1f729e02006-06-04 19:37:58 -04001108 u32 pstate = 0;
1109 int res, i;
1110 struct cpufreq_freqs freqs;
1111
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +02001112 pr_debug("cpu %d transition to index %u\n", smp_processor_id(), index);
Dave Jones1f729e02006-06-04 19:37:58 -04001113
Mark Langsdorfc5829cd2007-10-17 16:52:08 -05001114 /* get MSR index for hardware pstate transition */
Dave Jones1f729e02006-06-04 19:37:58 -04001115 pstate = index & HW_PSTATE_MASK;
Mark Langsdorfc5829cd2007-10-17 16:52:08 -05001116 if (pstate > data->max_hw_pstate)
Konrad Rzeszutek Wilkfbb5b892011-06-16 15:36:40 -04001117 return -EINVAL;
1118
Dave Jones0e64a0c2009-02-04 14:37:50 -05001119 freqs.old = find_khz_freq_from_pstate(data->powernow_table,
1120 data->currpstate);
Mark Langsdorfc5829cd2007-10-17 16:52:08 -05001121 freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
Dave Jones1f729e02006-06-04 19:37:58 -04001122
Rusty Russell8e7c2592009-06-12 20:58:37 +09301123 for_each_cpu(i, data->available_cores) {
Dave Jones1f729e02006-06-04 19:37:58 -04001124 freqs.cpu = i;
1125 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
1126 }
1127
1128 res = transition_pstate(data, pstate);
Mark Langsdorfc5829cd2007-10-17 16:52:08 -05001129 freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
Dave Jones1f729e02006-06-04 19:37:58 -04001130
Rusty Russell8e7c2592009-06-12 20:58:37 +09301131 for_each_cpu(i, data->available_cores) {
Dave Jones065b8072005-05-31 19:03:46 -07001132 freqs.cpu = i;
1133 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
Dave Jones2e3f8fa2006-05-30 17:25:14 -04001134 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 return res;
1136}
1137
1138/* Driver entry point to switch to the target frequency */
Dave Jones0e64a0c2009-02-04 14:37:50 -05001139static int powernowk8_target(struct cpufreq_policy *pol,
1140 unsigned targfreq, unsigned relation)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141{
Rusty Russellb8cbe7e2009-11-03 14:57:56 +10301142 cpumask_var_t oldmask;
travis@sgi.com2c6b8c02008-01-30 13:33:11 +01001143 struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
Adrian Bunk91800532006-04-19 00:07:28 +02001144 u32 checkfid;
1145 u32 checkvid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 unsigned int newstate;
1147 int ret = -EIO;
1148
Jacob Shin4211a302006-04-07 19:49:51 +02001149 if (!data)
1150 return -EINVAL;
1151
Adrian Bunk91800532006-04-19 00:07:28 +02001152 checkfid = data->currfid;
1153 checkvid = data->currvid;
1154
Rusty Russellb8cbe7e2009-11-03 14:57:56 +10301155 /* only run on specific CPU from here on. */
1156 /* This is poor form: use a workqueue or smp_call_function_single */
1157 if (!alloc_cpumask_var(&oldmask, GFP_KERNEL))
1158 return -ENOMEM;
1159
Rusty Russella4636812009-12-17 11:43:29 -06001160 cpumask_copy(oldmask, tsk_cpus_allowed(current));
Rusty Russellb8cbe7e2009-11-03 14:57:56 +10301161 set_cpus_allowed_ptr(current, cpumask_of(pol->cpu));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162
1163 if (smp_processor_id() != pol->cpu) {
Jacob Shin8aae8282005-11-21 07:23:08 -08001164 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 goto err_out;
1166 }
1167
1168 if (pending_bit_stuck()) {
1169 printk(KERN_ERR PFX "failing targ, change pending bit set\n");
1170 goto err_out;
1171 }
1172
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +02001173 pr_debug("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 pol->cpu, targfreq, pol->min, pol->max, relation);
1175
Dave Jones83844512006-05-30 17:43:54 -04001176 if (query_current_values_with_pending_wait(data))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178
Mark Langsdorfc5829cd2007-10-17 16:52:08 -05001179 if (cpu_family != CPU_HW_PSTATE) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +02001180 pr_debug("targ: curr fid 0x%x, vid 0x%x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 data->currfid, data->currvid);
1182
Dave Jones0e64a0c2009-02-04 14:37:50 -05001183 if ((checkvid != data->currvid) ||
1184 (checkfid != data->currfid)) {
Dave Jones1f729e02006-06-04 19:37:58 -04001185 printk(KERN_INFO PFX
Dave Jones0e64a0c2009-02-04 14:37:50 -05001186 "error - out of sync, fix 0x%x 0x%x, "
1187 "vid 0x%x 0x%x\n",
1188 checkfid, data->currfid,
1189 checkvid, data->currvid);
Dave Jones1f729e02006-06-04 19:37:58 -04001190 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 }
1192
Dave Jones0e64a0c2009-02-04 14:37:50 -05001193 if (cpufreq_frequency_table_target(pol, data->powernow_table,
1194 targfreq, relation, &newstate))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195 goto err_out;
1196
Ingo Molnar14cc3e22006-03-26 01:37:14 -08001197 mutex_lock(&fidvid_mutex);
Dave Jones065b8072005-05-31 19:03:46 -07001198
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199 powernow_k8_acpi_pst_values(data, newstate);
1200
Langsdorf, Marke7bdd7a2006-06-08 10:30:17 -05001201 if (cpu_family == CPU_HW_PSTATE)
Andreas Herrmanna8eb2842012-01-06 15:57:55 +01001202 ret = transition_frequency_pstate(data,
1203 data->powernow_table[newstate].index);
Dave Jones1f729e02006-06-04 19:37:58 -04001204 else
1205 ret = transition_frequency_fidvid(data, newstate);
1206 if (ret) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 printk(KERN_ERR PFX "transition frequency failed\n");
1208 ret = 1;
Ingo Molnar14cc3e22006-03-26 01:37:14 -08001209 mutex_unlock(&fidvid_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210 goto err_out;
1211 }
Ingo Molnar14cc3e22006-03-26 01:37:14 -08001212 mutex_unlock(&fidvid_mutex);
Dave Jones065b8072005-05-31 19:03:46 -07001213
Langsdorf, Marke7bdd7a2006-06-08 10:30:17 -05001214 if (cpu_family == CPU_HW_PSTATE)
Dave Jones0e64a0c2009-02-04 14:37:50 -05001215 pol->cur = find_khz_freq_from_pstate(data->powernow_table,
Andreas Herrmanna8eb2842012-01-06 15:57:55 +01001216 data->powernow_table[newstate].index);
Dave Jones1f729e02006-06-04 19:37:58 -04001217 else
1218 pol->cur = find_khz_freq_from_fid(data->currfid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219 ret = 0;
1220
1221err_out:
Rusty Russellb8cbe7e2009-11-03 14:57:56 +10301222 set_cpus_allowed_ptr(current, oldmask);
1223 free_cpumask_var(oldmask);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224 return ret;
1225}
1226
1227/* Driver entry point to verify the policy and range of frequencies */
1228static int powernowk8_verify(struct cpufreq_policy *pol)
1229{
travis@sgi.com2c6b8c02008-01-30 13:33:11 +01001230 struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231
Jacob Shin4211a302006-04-07 19:49:51 +02001232 if (!data)
1233 return -EINVAL;
1234
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 return cpufreq_frequency_table_verify(pol, data->powernow_table);
1236}
1237
Rusty Russell1ff6e972009-06-12 20:55:37 +09301238struct init_on_cpu {
1239 struct powernow_k8_data *data;
1240 int rc;
1241};
1242
1243static void __cpuinit powernowk8_cpu_init_on_cpu(void *_init_on_cpu)
1244{
1245 struct init_on_cpu *init_on_cpu = _init_on_cpu;
1246
1247 if (pending_bit_stuck()) {
1248 printk(KERN_ERR PFX "failing init, change pending bit set\n");
1249 init_on_cpu->rc = -ENODEV;
1250 return;
1251 }
1252
1253 if (query_current_values_with_pending_wait(init_on_cpu->data)) {
1254 init_on_cpu->rc = -ENODEV;
1255 return;
1256 }
1257
1258 if (cpu_family == CPU_OPTERON)
1259 fidvid_msr_init();
1260
1261 init_on_cpu->rc = 0;
1262}
1263
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264/* per CPU init entry point to the driver */
Andi Kleenaa41eb92006-01-16 01:56:36 +01001265static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266{
Andrew Mortonb394f1d2009-06-10 12:41:37 -07001267 static const char ACPI_PSS_BIOS_BUG_MSG[] =
1268 KERN_ERR FW_BUG PFX "No compatible ACPI _PSS objects found.\n"
Joe Perchesad361c92009-07-06 13:05:40 -07001269 FW_BUG PFX "Try again with latest BIOS.\n";
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 struct powernow_k8_data *data;
Rusty Russell1ff6e972009-06-12 20:55:37 +09301271 struct init_on_cpu init_on_cpu;
Andi Kleend7fa7062006-04-07 19:49:48 +02001272 int rc;
Mark Langsdorfa2fed572010-03-18 18:41:46 +01001273 struct cpuinfo_x86 *c = &cpu_data(pol->cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274
Jacob Shin8aae8282005-11-21 07:23:08 -08001275 if (!cpu_online(pol->cpu))
1276 return -ENODEV;
1277
Rusty Russell1ff6e972009-06-12 20:55:37 +09301278 smp_call_function_single(pol->cpu, check_supported_cpu, &rc, 1);
1279 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280 return -ENODEV;
1281
Dave Jonesbfdc7082005-10-20 15:16:15 -07001282 data = kzalloc(sizeof(struct powernow_k8_data), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283 if (!data) {
1284 printk(KERN_ERR PFX "unable to alloc powernow_k8_data");
1285 return -ENOMEM;
1286 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287
1288 data->cpu = pol->cpu;
Andreas Herrmanna266d9f2008-11-21 14:49:25 +01001289 data->currpstate = HW_PSTATE_INVALID;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290
Rusty Russella0abd522009-02-16 17:31:58 -06001291 if (powernow_k8_cpu_init_acpi(data)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292 /*
Lucas De Marchi0d2eb442011-03-17 16:24:16 -03001293 * Use the PSB BIOS structure. This is only available on
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294 * an UP version, and is deprecated by AMD.
1295 */
Randy Dunlap9ed059e2006-06-20 22:32:56 -07001296 if (num_online_cpus() != 1) {
Thomas Renningerdf182972009-04-22 13:48:32 +02001297 printk_once(ACPI_PSS_BIOS_BUG_MSG);
Dave Jones0cb8bc22009-02-18 14:11:00 -05001298 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299 }
1300 if (pol->cpu != 0) {
Thomas Renninger2fd47092008-09-01 14:27:03 +02001301 printk(KERN_ERR FW_BUG PFX "No ACPI _PSS objects for "
1302 "CPU other than CPU0. Complain to your BIOS "
1303 "vendor.\n");
Dave Jones0cb8bc22009-02-18 14:11:00 -05001304 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305 }
1306 rc = find_psb_table(data);
Dave Jones0cb8bc22009-02-18 14:11:00 -05001307 if (rc)
1308 goto err_out;
1309
Mark Langsdorf732553e2009-02-03 17:46:43 +01001310 /* Take a crude guess here.
1311 * That guess was in microseconds, so multiply with 1000 */
1312 pol->cpuinfo.transition_latency = (
1313 ((data->rvo + 8) * data->vstable * VST_UNITS_20US) +
1314 ((1 << data->irt) * 30)) * 1000;
1315 } else /* ACPI _PSS objects available */
1316 pol->cpuinfo.transition_latency = get_transition_latency(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317
1318 /* only run on specific CPU from here on */
Rusty Russell1ff6e972009-06-12 20:55:37 +09301319 init_on_cpu.data = data;
1320 smp_call_function_single(data->cpu, powernowk8_cpu_init_on_cpu,
1321 &init_on_cpu, 1);
1322 rc = init_on_cpu.rc;
1323 if (rc != 0)
1324 goto err_out_exit_acpi;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325
Linus Torvaldsf607e3a2008-08-19 13:34:59 -07001326 if (cpu_family == CPU_HW_PSTATE)
Rusty Russell835481d2009-01-04 05:18:06 -08001327 cpumask_copy(pol->cpus, cpumask_of(pol->cpu));
Linus Torvaldsf607e3a2008-08-19 13:34:59 -07001328 else
Rusty Russell7ad728f2009-03-13 14:49:50 +10301329 cpumask_copy(pol->cpus, cpu_core_mask(pol->cpu));
Rusty Russell835481d2009-01-04 05:18:06 -08001330 data->available_cores = pol->cpus;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331
Langsdorf, Marke7bdd7a2006-06-08 10:30:17 -05001332 if (cpu_family == CPU_HW_PSTATE)
Dave Jones0e64a0c2009-02-04 14:37:50 -05001333 pol->cur = find_khz_freq_from_pstate(data->powernow_table,
1334 data->currpstate);
Dave Jones1f729e02006-06-04 19:37:58 -04001335 else
1336 pol->cur = find_khz_freq_from_fid(data->currfid);
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +02001337 pr_debug("policy current frequency %d kHz\n", pol->cur);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338
1339 /* min/max the cpu is capable of */
1340 if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) {
Thomas Renninger2fd47092008-09-01 14:27:03 +02001341 printk(KERN_ERR FW_BUG PFX "invalid powernow_table\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342 powernow_k8_cpu_exit_acpi(data);
1343 kfree(data->powernow_table);
1344 kfree(data);
1345 return -EINVAL;
1346 }
1347
Mark Langsdorfa2fed572010-03-18 18:41:46 +01001348 /* Check for APERF/MPERF support in hardware */
1349 if (cpu_has(c, X86_FEATURE_APERFMPERF))
1350 cpufreq_amd64_driver.getavg = cpufreq_get_measured_perf;
1351
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352 cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
1353
Langsdorf, Marke7bdd7a2006-06-08 10:30:17 -05001354 if (cpu_family == CPU_HW_PSTATE)
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +02001355 pr_debug("cpu_init done, current pstate 0x%x\n",
Dave Jones0e64a0c2009-02-04 14:37:50 -05001356 data->currpstate);
Dave Jones1f729e02006-06-04 19:37:58 -04001357 else
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +02001358 pr_debug("cpu_init done, current fid 0x%x, vid 0x%x\n",
Dave Jones1f729e02006-06-04 19:37:58 -04001359 data->currfid, data->currvid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360
travis@sgi.com2c6b8c02008-01-30 13:33:11 +01001361 per_cpu(powernow_data, pol->cpu) = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362
1363 return 0;
1364
Rusty Russell1ff6e972009-06-12 20:55:37 +09301365err_out_exit_acpi:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366 powernow_k8_cpu_exit_acpi(data);
1367
Dave Jones0cb8bc22009-02-18 14:11:00 -05001368err_out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 kfree(data);
1370 return -ENODEV;
1371}
1372
Dave Jones0e64a0c2009-02-04 14:37:50 -05001373static int __devexit powernowk8_cpu_exit(struct cpufreq_policy *pol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374{
travis@sgi.com2c6b8c02008-01-30 13:33:11 +01001375 struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376
1377 if (!data)
1378 return -EINVAL;
1379
1380 powernow_k8_cpu_exit_acpi(data);
1381
1382 cpufreq_frequency_table_put_attr(pol->cpu);
1383
1384 kfree(data->powernow_table);
1385 kfree(data);
Thomas Renninger557a7012009-12-14 11:44:15 +01001386 per_cpu(powernow_data, pol->cpu) = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387
1388 return 0;
1389}
1390
Rusty Russell1ff6e972009-06-12 20:55:37 +09301391static void query_values_on_cpu(void *_err)
1392{
1393 int *err = _err;
Tejun Heo0a3aee02010-12-18 16:28:55 +01001394 struct powernow_k8_data *data = __this_cpu_read(powernow_data);
Rusty Russell1ff6e972009-06-12 20:55:37 +09301395
1396 *err = query_current_values_with_pending_wait(data);
1397}
1398
Dave Jones0e64a0c2009-02-04 14:37:50 -05001399static unsigned int powernowk8_get(unsigned int cpu)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400{
Naga Chumbalkare15bc452009-06-11 15:26:54 +00001401 struct powernow_k8_data *data = per_cpu(powernow_data, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402 unsigned int khz = 0;
Rusty Russell1ff6e972009-06-12 20:55:37 +09301403 int err;
shin, jacobeef51672006-03-27 09:57:20 -06001404
1405 if (!data)
Thomas Renninger557a7012009-12-14 11:44:15 +01001406 return 0;
shin, jacobeef51672006-03-27 09:57:20 -06001407
Rusty Russell1ff6e972009-06-12 20:55:37 +09301408 smp_call_function_single(cpu, query_values_on_cpu, &err, true);
1409 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 goto out;
1411
Joachim Deguara58389a82007-01-30 16:53:54 +01001412 if (cpu_family == CPU_HW_PSTATE)
Mike Travisfc0e4742008-04-04 18:11:05 -07001413 khz = find_khz_freq_from_pstate(data->powernow_table,
1414 data->currpstate);
Joachim Deguara58389a82007-01-30 16:53:54 +01001415 else
1416 khz = find_khz_freq_from_fid(data->currfid);
1417
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418
Dave Jonesb9111b72005-09-23 11:10:42 -07001419out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420 return khz;
1421}
1422
Borislav Petkov73860c62010-03-31 21:56:42 +02001423static void _cpb_toggle_msrs(bool t)
1424{
1425 int cpu;
1426
1427 get_online_cpus();
1428
1429 rdmsr_on_cpus(cpu_online_mask, MSR_K7_HWCR, msrs);
1430
1431 for_each_cpu(cpu, cpu_online_mask) {
1432 struct msr *reg = per_cpu_ptr(msrs, cpu);
1433 if (t)
1434 reg->l &= ~BIT(25);
1435 else
1436 reg->l |= BIT(25);
1437 }
1438 wrmsr_on_cpus(cpu_online_mask, MSR_K7_HWCR, msrs);
1439
1440 put_online_cpus();
1441}
1442
1443/*
1444 * Switch on/off core performance boosting.
1445 *
1446 * 0=disable
1447 * 1=enable.
1448 */
1449static void cpb_toggle(bool t)
1450{
1451 if (!cpb_capable)
1452 return;
1453
1454 if (t && !cpb_enabled) {
1455 cpb_enabled = true;
1456 _cpb_toggle_msrs(t);
1457 printk(KERN_INFO PFX "Core Boosting enabled.\n");
1458 } else if (!t && cpb_enabled) {
1459 cpb_enabled = false;
1460 _cpb_toggle_msrs(t);
1461 printk(KERN_INFO PFX "Core Boosting disabled.\n");
1462 }
1463}
1464
1465static ssize_t store_cpb(struct cpufreq_policy *policy, const char *buf,
1466 size_t count)
1467{
1468 int ret = -EINVAL;
1469 unsigned long val = 0;
1470
1471 ret = strict_strtoul(buf, 10, &val);
1472 if (!ret && (val == 0 || val == 1) && cpb_capable)
1473 cpb_toggle(val);
1474 else
1475 return -EINVAL;
1476
1477 return count;
1478}
1479
1480static ssize_t show_cpb(struct cpufreq_policy *policy, char *buf)
1481{
1482 return sprintf(buf, "%u\n", cpb_enabled);
1483}
1484
1485#define define_one_rw(_name) \
1486static struct freq_attr _name = \
1487__ATTR(_name, 0644, show_##_name, store_##_name)
1488
1489define_one_rw(cpb);
1490
Dave Jones0e64a0c2009-02-04 14:37:50 -05001491static struct freq_attr *powernow_k8_attr[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492 &cpufreq_freq_attr_scaling_available_freqs,
Borislav Petkov73860c62010-03-31 21:56:42 +02001493 &cpb,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494 NULL,
1495};
1496
Linus Torvalds221dee22007-02-26 14:55:48 -08001497static struct cpufreq_driver cpufreq_amd64_driver = {
Thomas Renningere2f74f32009-11-19 12:31:01 +01001498 .verify = powernowk8_verify,
1499 .target = powernowk8_target,
1500 .bios_limit = acpi_processor_get_bios_limit,
1501 .init = powernowk8_cpu_init,
1502 .exit = __devexit_p(powernowk8_cpu_exit),
1503 .get = powernowk8_get,
1504 .name = "powernow-k8",
1505 .owner = THIS_MODULE,
1506 .attr = powernow_k8_attr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507};
1508
Borislav Petkov73860c62010-03-31 21:56:42 +02001509/*
1510 * Clear the boost-disable flag on the CPU_DOWN path so that this cpu
1511 * cannot block the remaining ones from boosting. On the CPU_UP path we
1512 * simply keep the boost-disable flag in sync with the current global
1513 * state.
1514 */
Borislav Petkovfe501f12010-05-25 15:28:58 +00001515static int cpb_notify(struct notifier_block *nb, unsigned long action,
1516 void *hcpu)
Borislav Petkov73860c62010-03-31 21:56:42 +02001517{
1518 unsigned cpu = (long)hcpu;
1519 u32 lo, hi;
1520
1521 switch (action) {
1522 case CPU_UP_PREPARE:
1523 case CPU_UP_PREPARE_FROZEN:
1524
1525 if (!cpb_enabled) {
1526 rdmsr_on_cpu(cpu, MSR_K7_HWCR, &lo, &hi);
1527 lo |= BIT(25);
1528 wrmsr_on_cpu(cpu, MSR_K7_HWCR, lo, hi);
1529 }
1530 break;
1531
1532 case CPU_DOWN_PREPARE:
1533 case CPU_DOWN_PREPARE_FROZEN:
1534 rdmsr_on_cpu(cpu, MSR_K7_HWCR, &lo, &hi);
1535 lo &= ~BIT(25);
1536 wrmsr_on_cpu(cpu, MSR_K7_HWCR, lo, hi);
1537 break;
1538
1539 default:
1540 break;
1541 }
1542
1543 return NOTIFY_OK;
1544}
1545
Borislav Petkovfe501f12010-05-25 15:28:58 +00001546static struct notifier_block cpb_nb = {
Borislav Petkov73860c62010-03-31 21:56:42 +02001547 .notifier_call = cpb_notify,
1548};
1549
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550/* driver entry point for init */
Andi Kleenaa41eb92006-01-16 01:56:36 +01001551static int __cpuinit powernowk8_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552{
Borislav Petkov73860c62010-03-31 21:56:42 +02001553 unsigned int i, supported_cpus = 0, cpu;
Neil Brownac818312010-11-24 11:28:01 +11001554 int rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555
Andrew Mortona7201152006-03-24 03:15:07 -08001556 for_each_online_cpu(i) {
Rusty Russell1ff6e972009-06-12 20:55:37 +09301557 int rc;
1558 smp_call_function_single(i, check_supported_cpu, &rc, 1);
1559 if (rc == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560 supported_cpus++;
1561 }
1562
Borislav Petkov73860c62010-03-31 21:56:42 +02001563 if (supported_cpus != num_online_cpus())
1564 return -ENODEV;
1565
1566 printk(KERN_INFO PFX "Found %d %s (%d cpu cores) (" VERSION ")\n",
1567 num_online_nodes(), boot_cpu_data.x86_model_id, supported_cpus);
1568
1569 if (boot_cpu_has(X86_FEATURE_CPB)) {
1570
1571 cpb_capable = true;
1572
Borislav Petkov73860c62010-03-31 21:56:42 +02001573 msrs = msrs_alloc();
1574 if (!msrs) {
1575 printk(KERN_ERR "%s: Error allocating msrs!\n", __func__);
1576 return -ENOMEM;
1577 }
1578
Dave Jonesa536b122010-11-23 21:29:31 -05001579 register_cpu_notifier(&cpb_nb);
1580
Borislav Petkov73860c62010-03-31 21:56:42 +02001581 rdmsr_on_cpus(cpu_online_mask, MSR_K7_HWCR, msrs);
1582
1583 for_each_cpu(cpu, cpu_online_mask) {
1584 struct msr *reg = per_cpu_ptr(msrs, cpu);
1585 cpb_enabled |= !(!!(reg->l & BIT(25)));
1586 }
1587
1588 printk(KERN_INFO PFX "Core Performance Boosting: %s.\n",
1589 (cpb_enabled ? "on" : "off"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001590 }
1591
Neil Brownac818312010-11-24 11:28:01 +11001592 rv = cpufreq_register_driver(&cpufreq_amd64_driver);
1593 if (rv < 0 && boot_cpu_has(X86_FEATURE_CPB)) {
1594 unregister_cpu_notifier(&cpb_nb);
1595 msrs_free(msrs);
1596 msrs = NULL;
1597 }
1598 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599}
1600
1601/* driver entry point for term */
1602static void __exit powernowk8_exit(void)
1603{
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +02001604 pr_debug("exit\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605
Borislav Petkov73860c62010-03-31 21:56:42 +02001606 if (boot_cpu_has(X86_FEATURE_CPB)) {
1607 msrs_free(msrs);
1608 msrs = NULL;
1609
1610 unregister_cpu_notifier(&cpb_nb);
1611 }
1612
Linus Torvalds1da177e2005-04-16 15:20:36 -07001613 cpufreq_unregister_driver(&cpufreq_amd64_driver);
1614}
1615
Dave Jones0e64a0c2009-02-04 14:37:50 -05001616MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and "
1617 "Mark Langsdorf <mark.langsdorf@amd.com>");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001618MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1619MODULE_LICENSE("GPL");
1620
1621late_initcall(powernowk8_init);
1622module_exit(powernowk8_exit);