1// SPDX-License-Identifier: GPL-2.0-only
2#include <linux/device.h>
3#include <linux/cpu.h>
4#include <linux/smp.h>
5#include <linux/percpu.h>
6#include <linux/init.h>
7#include <linux/sched.h>
8#include <linux/export.h>
9#include <linux/nodemask.h>
10#include <linux/cpumask.h>
11#include <linux/notifier.h>
12#include <linux/of.h>
13
14#include <asm/current.h>
15#include <asm/processor.h>
16#include <asm/cputable.h>
17#include <asm/hvcall.h>
18#include <asm/machdep.h>
19#include <asm/smp.h>
20#include <asm/time.h>
21#include <asm/pmc.h>
22#include <asm/firmware.h>
23#include <asm/idle.h>
24#include <asm/svm.h>
25
26#include "cacheinfo.h"
27#include "setup.h"
28
29#ifdef CONFIG_PPC64
30#include <asm/paca.h>
31#include <asm/lppaca.h>
32#endif
33
34static DEFINE_PER_CPU(struct cpu, cpu_devices);
35
36#ifdef CONFIG_PPC64
37
38/*
39 * Snooze delay has not been hooked up since 3fa8cad82b94 ("powerpc/pseries/cpuidle:
40 * smt-snooze-delay cleanup.") and has been broken even longer. As was foretold in
41 * 2014:
42 *
43 * "ppc64_util currently utilises it. Once we fix ppc64_util, propose to clean
44 * up the kernel code."
45 *
46 * powerpc-utils stopped using it as of 1.3.8. At some point in the future this
47 * code should be removed.
48 */
49
50static ssize_t store_smt_snooze_delay(struct device *dev,
51 struct device_attribute *attr,
52 const char *buf,
53 size_t count)
54{
55 pr_warn_once("%s (%d) stored to unsupported smt_snooze_delay, which has no effect.\n",
56 current->comm, current->pid);
57 return count;
58}
59
60static ssize_t show_smt_snooze_delay(struct device *dev,
61 struct device_attribute *attr,
62 char *buf)
63{
64 pr_warn_once("%s (%d) read from unsupported smt_snooze_delay\n",
65 current->comm, current->pid);
66 return sprintf(buf, "100\n");
67}
68
69static DEVICE_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay,
70 store_smt_snooze_delay);
71
72static int __init setup_smt_snooze_delay(char *str)
73{
74 if (!cpu_has_feature(CPU_FTR_SMT))
75 return 1;
76
77 pr_warn("smt-snooze-delay command line option has no effect\n");
78 return 1;
79}
80__setup("smt-snooze-delay=", setup_smt_snooze_delay);
81
82#endif /* CONFIG_PPC64 */
83
84#define __SYSFS_SPRSETUP_READ_WRITE(NAME, ADDRESS, EXTRA) \
85static void read_##NAME(void *val) \
86{ \
87 *(unsigned long *)val = mfspr(ADDRESS); \
88} \
89static void write_##NAME(void *val) \
90{ \
91 EXTRA; \
92 mtspr(ADDRESS, *(unsigned long *)val); \
93}
94
95#define __SYSFS_SPRSETUP_SHOW_STORE(NAME) \
96static ssize_t show_##NAME(struct device *dev, \
97 struct device_attribute *attr, \
98 char *buf) \
99{ \
100 struct cpu *cpu = container_of(dev, struct cpu, dev); \
101 unsigned long val; \
102 smp_call_function_single(cpu->dev.id, read_##NAME, &val, 1); \
103 return sprintf(buf, "%lx\n", val); \
104} \
105static ssize_t __used \
106 store_##NAME(struct device *dev, struct device_attribute *attr, \
107 const char *buf, size_t count) \
108{ \
109 struct cpu *cpu = container_of(dev, struct cpu, dev); \
110 unsigned long val; \
111 int ret = sscanf(buf, "%lx", &val); \
112 if (ret != 1) \
113 return -EINVAL; \
114 smp_call_function_single(cpu->dev.id, write_##NAME, &val, 1); \
115 return count; \
116}
117
118#define SYSFS_PMCSETUP(NAME, ADDRESS) \
119 __SYSFS_SPRSETUP_READ_WRITE(NAME, ADDRESS, ppc_enable_pmcs()) \
120 __SYSFS_SPRSETUP_SHOW_STORE(NAME)
121#define SYSFS_SPRSETUP(NAME, ADDRESS) \
122 __SYSFS_SPRSETUP_READ_WRITE(NAME, ADDRESS, ) \
123 __SYSFS_SPRSETUP_SHOW_STORE(NAME)
124
125#define SYSFS_SPRSETUP_SHOW_STORE(NAME) \
126 __SYSFS_SPRSETUP_SHOW_STORE(NAME)
127
128#ifdef CONFIG_PPC64
129
130/*
131 * This is the system wide DSCR register default value. Any
132 * change to this default value through the sysfs interface
133 * will update all per cpu DSCR default values across the
134 * system stored in their respective PACA structures.
135 */
136static unsigned long dscr_default;
137
138/**
139 * read_dscr() - Fetch the cpu specific DSCR default
140 * @val: Returned cpu specific DSCR default value
141 *
142 * This function returns the per cpu DSCR default value
143 * for any cpu which is contained in its PACA structure.
144 */
145static void read_dscr(void *val)
146{
147 *(unsigned long *)val = get_paca()->dscr_default;
148}
149
150
151/**
152 * write_dscr() - Update the cpu specific DSCR default
153 * @val: New cpu specific DSCR default value to update
154 *
155 * This function updates the per cpu DSCR default value
156 * for any cpu which is contained in its PACA structure.
157 */
158static void write_dscr(void *val)
159{
160 get_paca()->dscr_default = *(unsigned long *)val;
161 if (!current->thread.dscr_inherit) {
162 current->thread.dscr = *(unsigned long *)val;
163 mtspr(SPRN_DSCR, *(unsigned long *)val);
164 }
165}
166
167SYSFS_SPRSETUP_SHOW_STORE(dscr);
168static DEVICE_ATTR(dscr, 0600, show_dscr, store_dscr);
169
170static void add_write_permission_dev_attr(struct device_attribute *attr)
171{
172 attr->attr.mode |= 0200;
173}
174
175/**
176 * show_dscr_default() - Fetch the system wide DSCR default
177 * @dev: Device structure
178 * @attr: Device attribute structure
179 * @buf: Interface buffer
180 *
181 * This function returns the system wide DSCR default value.
182 */
183static ssize_t show_dscr_default(struct device *dev,
184 struct device_attribute *attr, char *buf)
185{
186 return sprintf(buf, "%lx\n", dscr_default);
187}
188
189/**
190 * store_dscr_default() - Update the system wide DSCR default
191 * @dev: Device structure
192 * @attr: Device attribute structure
193 * @buf: Interface buffer
194 * @count: Size of the update
195 *
196 * This function updates the system wide DSCR default value.
197 */
198static ssize_t __used store_dscr_default(struct device *dev,
199 struct device_attribute *attr, const char *buf,
200 size_t count)
201{
202 unsigned long val;
203 int ret = 0;
204
205 ret = sscanf(buf, "%lx", &val);
206 if (ret != 1)
207 return -EINVAL;
208 dscr_default = val;
209
210 on_each_cpu(write_dscr, &val, 1);
211
212 return count;
213}
214
215static DEVICE_ATTR(dscr_default, 0600,
216 show_dscr_default, store_dscr_default);
217
218static void __init sysfs_create_dscr_default(void)
219{
220 if (cpu_has_feature(CPU_FTR_DSCR)) {
221 struct device *dev_root;
222 int cpu;
223
224 dscr_default = spr_default_dscr;
225 for_each_possible_cpu(cpu)
226 paca_ptrs[cpu]->dscr_default = dscr_default;
227
228 dev_root = bus_get_dev_root(&cpu_subsys);
229 if (dev_root) {
230 device_create_file(dev_root, &dev_attr_dscr_default);
231 put_device(dev_root);
232 }
233 }
234}
235#endif /* CONFIG_PPC64 */
236
237#ifdef CONFIG_PPC_E500
238#define MAX_BIT 63
239
240static u64 pw20_wt;
241static u64 altivec_idle_wt;
242
243static unsigned int get_idle_ticks_bit(u64 ns)
244{
245 u64 cycle;
246
247 if (ns >= 10000)
248 cycle = div_u64(ns + 500, 1000) * tb_ticks_per_usec;
249 else
250 cycle = div_u64(ns * tb_ticks_per_usec, 1000);
251
252 if (!cycle)
253 return 0;
254
255 return ilog2(cycle);
256}
257
258static void do_show_pwrmgtcr0(void *val)
259{
260 u32 *value = val;
261
262 *value = mfspr(SPRN_PWRMGTCR0);
263}
264
265static ssize_t show_pw20_state(struct device *dev,
266 struct device_attribute *attr, char *buf)
267{
268 u32 value;
269 unsigned int cpu = dev->id;
270
271 smp_call_function_single(cpu, do_show_pwrmgtcr0, &value, 1);
272
273 value &= PWRMGTCR0_PW20_WAIT;
274
275 return sprintf(buf, "%u\n", value ? 1 : 0);
276}
277
278static void do_store_pw20_state(void *val)
279{
280 u32 *value = val;
281 u32 pw20_state;
282
283 pw20_state = mfspr(SPRN_PWRMGTCR0);
284
285 if (*value)
286 pw20_state |= PWRMGTCR0_PW20_WAIT;
287 else
288 pw20_state &= ~PWRMGTCR0_PW20_WAIT;
289
290 mtspr(SPRN_PWRMGTCR0, pw20_state);
291}
292
293static ssize_t store_pw20_state(struct device *dev,
294 struct device_attribute *attr,
295 const char *buf, size_t count)
296{
297 u32 value;
298 unsigned int cpu = dev->id;
299
300 if (kstrtou32(buf, 0, &value))
301 return -EINVAL;
302
303 if (value > 1)
304 return -EINVAL;
305
306 smp_call_function_single(cpu, do_store_pw20_state, &value, 1);
307
308 return count;
309}
310
311static ssize_t show_pw20_wait_time(struct device *dev,
312 struct device_attribute *attr, char *buf)
313{
314 u32 value;
315 u64 tb_cycle = 1;
316 u64 time;
317
318 unsigned int cpu = dev->id;
319
320 if (!pw20_wt) {
321 smp_call_function_single(cpu, do_show_pwrmgtcr0, &value, 1);
322 value = (value & PWRMGTCR0_PW20_ENT) >>
323 PWRMGTCR0_PW20_ENT_SHIFT;
324
325 tb_cycle = (tb_cycle << (MAX_BIT - value + 1));
326 /* convert ms to ns */
327 if (tb_ticks_per_usec > 1000) {
328 time = div_u64(tb_cycle, tb_ticks_per_usec / 1000);
329 } else {
330 u32 rem_us;
331
332 time = div_u64_rem(tb_cycle, tb_ticks_per_usec,
333 &rem_us);
334 time = time * 1000 + rem_us * 1000 / tb_ticks_per_usec;
335 }
336 } else {
337 time = pw20_wt;
338 }
339
340 return sprintf(buf, "%llu\n", time > 0 ? time : 0);
341}
342
343static void set_pw20_wait_entry_bit(void *val)
344{
345 u32 *value = val;
346 u32 pw20_idle;
347
348 pw20_idle = mfspr(SPRN_PWRMGTCR0);
349
350 /* Set Automatic PW20 Core Idle Count */
351 /* clear count */
352 pw20_idle &= ~PWRMGTCR0_PW20_ENT;
353
354 /* set count */
355 pw20_idle |= ((MAX_BIT - *value) << PWRMGTCR0_PW20_ENT_SHIFT);
356
357 mtspr(SPRN_PWRMGTCR0, pw20_idle);
358}
359
360static ssize_t store_pw20_wait_time(struct device *dev,
361 struct device_attribute *attr,
362 const char *buf, size_t count)
363{
364 u32 entry_bit;
365 u64 value;
366
367 unsigned int cpu = dev->id;
368
369 if (kstrtou64(buf, 0, &value))
370 return -EINVAL;
371
372 if (!value)
373 return -EINVAL;
374
375 entry_bit = get_idle_ticks_bit(value);
376 if (entry_bit > MAX_BIT)
377 return -EINVAL;
378
379 pw20_wt = value;
380
381 smp_call_function_single(cpu, set_pw20_wait_entry_bit,
382 &entry_bit, 1);
383
384 return count;
385}
386
387static ssize_t show_altivec_idle(struct device *dev,
388 struct device_attribute *attr, char *buf)
389{
390 u32 value;
391 unsigned int cpu = dev->id;
392
393 smp_call_function_single(cpu, do_show_pwrmgtcr0, &value, 1);
394
395 value &= PWRMGTCR0_AV_IDLE_PD_EN;
396
397 return sprintf(buf, "%u\n", value ? 1 : 0);
398}
399
400static void do_store_altivec_idle(void *val)
401{
402 u32 *value = val;
403 u32 altivec_idle;
404
405 altivec_idle = mfspr(SPRN_PWRMGTCR0);
406
407 if (*value)
408 altivec_idle |= PWRMGTCR0_AV_IDLE_PD_EN;
409 else
410 altivec_idle &= ~PWRMGTCR0_AV_IDLE_PD_EN;
411
412 mtspr(SPRN_PWRMGTCR0, altivec_idle);
413}
414
415static ssize_t store_altivec_idle(struct device *dev,
416 struct device_attribute *attr,
417 const char *buf, size_t count)
418{
419 u32 value;
420 unsigned int cpu = dev->id;
421
422 if (kstrtou32(buf, 0, &value))
423 return -EINVAL;
424
425 if (value > 1)
426 return -EINVAL;
427
428 smp_call_function_single(cpu, do_store_altivec_idle, &value, 1);
429
430 return count;
431}
432
433static ssize_t show_altivec_idle_wait_time(struct device *dev,
434 struct device_attribute *attr, char *buf)
435{
436 u32 value;
437 u64 tb_cycle = 1;
438 u64 time;
439
440 unsigned int cpu = dev->id;
441
442 if (!altivec_idle_wt) {
443 smp_call_function_single(cpu, do_show_pwrmgtcr0, &value, 1);
444 value = (value & PWRMGTCR0_AV_IDLE_CNT) >>
445 PWRMGTCR0_AV_IDLE_CNT_SHIFT;
446
447 tb_cycle = (tb_cycle << (MAX_BIT - value + 1));
448 /* convert ms to ns */
449 if (tb_ticks_per_usec > 1000) {
450 time = div_u64(tb_cycle, tb_ticks_per_usec / 1000);
451 } else {
452 u32 rem_us;
453
454 time = div_u64_rem(tb_cycle, tb_ticks_per_usec,
455 &rem_us);
456 time = time * 1000 + rem_us * 1000 / tb_ticks_per_usec;
457 }
458 } else {
459 time = altivec_idle_wt;
460 }
461
462 return sprintf(buf, "%llu\n", time > 0 ? time : 0);
463}
464
465static void set_altivec_idle_wait_entry_bit(void *val)
466{
467 u32 *value = val;
468 u32 altivec_idle;
469
470 altivec_idle = mfspr(SPRN_PWRMGTCR0);
471
472 /* Set Automatic AltiVec Idle Count */
473 /* clear count */
474 altivec_idle &= ~PWRMGTCR0_AV_IDLE_CNT;
475
476 /* set count */
477 altivec_idle |= ((MAX_BIT - *value) << PWRMGTCR0_AV_IDLE_CNT_SHIFT);
478
479 mtspr(SPRN_PWRMGTCR0, altivec_idle);
480}
481
482static ssize_t store_altivec_idle_wait_time(struct device *dev,
483 struct device_attribute *attr,
484 const char *buf, size_t count)
485{
486 u32 entry_bit;
487 u64 value;
488
489 unsigned int cpu = dev->id;
490
491 if (kstrtou64(buf, 0, &value))
492 return -EINVAL;
493
494 if (!value)
495 return -EINVAL;
496
497 entry_bit = get_idle_ticks_bit(value);
498 if (entry_bit > MAX_BIT)
499 return -EINVAL;
500
501 altivec_idle_wt = value;
502
503 smp_call_function_single(cpu, set_altivec_idle_wait_entry_bit,
504 &entry_bit, 1);
505
506 return count;
507}
508
509/*
510 * Enable/Disable interface:
511 * 0, disable. 1, enable.
512 */
513static DEVICE_ATTR(pw20_state, 0600, show_pw20_state, store_pw20_state);
514static DEVICE_ATTR(altivec_idle, 0600, show_altivec_idle, store_altivec_idle);
515
516/*
517 * Set wait time interface:(Nanosecond)
518 * Example: Base on TBfreq is 41MHZ.
519 * 1~48(ns): TB[63]
520 * 49~97(ns): TB[62]
521 * 98~195(ns): TB[61]
522 * 196~390(ns): TB[60]
523 * 391~780(ns): TB[59]
524 * 781~1560(ns): TB[58]
525 * ...
526 */
527static DEVICE_ATTR(pw20_wait_time, 0600,
528 show_pw20_wait_time,
529 store_pw20_wait_time);
530static DEVICE_ATTR(altivec_idle_wait_time, 0600,
531 show_altivec_idle_wait_time,
532 store_altivec_idle_wait_time);
533#endif
534
535/*
536 * Enabling PMCs will slow partition context switch times so we only do
537 * it the first time we write to the PMCs.
538 */
539
540static DEFINE_PER_CPU(char, pmcs_enabled);
541
542void ppc_enable_pmcs(void)
543{
544 ppc_set_pmu_inuse(1);
545
546 /* Only need to enable them once */
547 if (__this_cpu_read(pmcs_enabled))
548 return;
549
550 __this_cpu_write(pmcs_enabled, 1);
551
552 if (ppc_md.enable_pmcs)
553 ppc_md.enable_pmcs();
554}
555EXPORT_SYMBOL(ppc_enable_pmcs);
556
557
558
559/* Let's define all possible registers, we'll only hook up the ones
560 * that are implemented on the current processor
561 */
562
563#ifdef CONFIG_PMU_SYSFS
564#if defined(CONFIG_PPC64) || defined(CONFIG_PPC_BOOK3S_32)
565#define HAS_PPC_PMC_CLASSIC 1
566#define HAS_PPC_PMC_IBM 1
567#endif
568
569#ifdef CONFIG_PPC64
570#define HAS_PPC_PMC_PA6T 1
571#define HAS_PPC_PMC56 1
572#endif
573
574#ifdef CONFIG_PPC_BOOK3S_32
575#define HAS_PPC_PMC_G4 1
576#endif
577#endif /* CONFIG_PMU_SYSFS */
578
579#if defined(CONFIG_PPC64) && defined(CONFIG_DEBUG_MISC)
580#define HAS_PPC_PA6T
581#endif
582/*
583 * SPRs which are not related to PMU.
584 */
585#ifdef CONFIG_PPC64
586SYSFS_SPRSETUP(purr, SPRN_PURR);
587SYSFS_SPRSETUP(spurr, SPRN_SPURR);
588SYSFS_SPRSETUP(pir, SPRN_PIR);
589SYSFS_SPRSETUP(tscr, SPRN_TSCR);
590
591/*
592 Lets only enable read for phyp resources and
593 enable write when needed with a separate function.
594 Lets be conservative and default to pseries.
595*/
596static DEVICE_ATTR(spurr, 0400, show_spurr, NULL);
597static DEVICE_ATTR(purr, 0400, show_purr, store_purr);
598static DEVICE_ATTR(pir, 0400, show_pir, NULL);
599static DEVICE_ATTR(tscr, 0600, show_tscr, store_tscr);
600#endif /* CONFIG_PPC64 */
601
602#ifdef HAS_PPC_PMC_CLASSIC
603SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0);
604SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1);
605SYSFS_PMCSETUP(pmc1, SPRN_PMC1);
606SYSFS_PMCSETUP(pmc2, SPRN_PMC2);
607SYSFS_PMCSETUP(pmc3, SPRN_PMC3);
608SYSFS_PMCSETUP(pmc4, SPRN_PMC4);
609SYSFS_PMCSETUP(pmc5, SPRN_PMC5);
610SYSFS_PMCSETUP(pmc6, SPRN_PMC6);
611#endif
612
613#ifdef HAS_PPC_PMC_G4
614SYSFS_PMCSETUP(mmcr2, SPRN_MMCR2);
615#endif
616
617#ifdef HAS_PPC_PMC56
618SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
619SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
620
621SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
622SYSFS_PMCSETUP(mmcr3, SPRN_MMCR3);
623
624static DEVICE_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
625static DEVICE_ATTR(mmcr3, 0600, show_mmcr3, store_mmcr3);
626#endif /* HAS_PPC_PMC56 */
627
628
629
630
631#ifdef HAS_PPC_PMC_PA6T
632SYSFS_PMCSETUP(pa6t_pmc0, SPRN_PA6T_PMC0);
633SYSFS_PMCSETUP(pa6t_pmc1, SPRN_PA6T_PMC1);
634SYSFS_PMCSETUP(pa6t_pmc2, SPRN_PA6T_PMC2);
635SYSFS_PMCSETUP(pa6t_pmc3, SPRN_PA6T_PMC3);
636SYSFS_PMCSETUP(pa6t_pmc4, SPRN_PA6T_PMC4);
637SYSFS_PMCSETUP(pa6t_pmc5, SPRN_PA6T_PMC5);
638#endif
639
640#ifdef HAS_PPC_PA6T
641SYSFS_SPRSETUP(hid0, SPRN_HID0);
642SYSFS_SPRSETUP(hid1, SPRN_HID1);
643SYSFS_SPRSETUP(hid4, SPRN_HID4);
644SYSFS_SPRSETUP(hid5, SPRN_HID5);
645SYSFS_SPRSETUP(ima0, SPRN_PA6T_IMA0);
646SYSFS_SPRSETUP(ima1, SPRN_PA6T_IMA1);
647SYSFS_SPRSETUP(ima2, SPRN_PA6T_IMA2);
648SYSFS_SPRSETUP(ima3, SPRN_PA6T_IMA3);
649SYSFS_SPRSETUP(ima4, SPRN_PA6T_IMA4);
650SYSFS_SPRSETUP(ima5, SPRN_PA6T_IMA5);
651SYSFS_SPRSETUP(ima6, SPRN_PA6T_IMA6);
652SYSFS_SPRSETUP(ima7, SPRN_PA6T_IMA7);
653SYSFS_SPRSETUP(ima8, SPRN_PA6T_IMA8);
654SYSFS_SPRSETUP(ima9, SPRN_PA6T_IMA9);
655SYSFS_SPRSETUP(imaat, SPRN_PA6T_IMAAT);
656SYSFS_SPRSETUP(btcr, SPRN_PA6T_BTCR);
657SYSFS_SPRSETUP(pccr, SPRN_PA6T_PCCR);
658SYSFS_SPRSETUP(rpccr, SPRN_PA6T_RPCCR);
659SYSFS_SPRSETUP(der, SPRN_PA6T_DER);
660SYSFS_SPRSETUP(mer, SPRN_PA6T_MER);
661SYSFS_SPRSETUP(ber, SPRN_PA6T_BER);
662SYSFS_SPRSETUP(ier, SPRN_PA6T_IER);
663SYSFS_SPRSETUP(sier, SPRN_PA6T_SIER);
664SYSFS_SPRSETUP(siar, SPRN_PA6T_SIAR);
665SYSFS_SPRSETUP(tsr0, SPRN_PA6T_TSR0);
666SYSFS_SPRSETUP(tsr1, SPRN_PA6T_TSR1);
667SYSFS_SPRSETUP(tsr2, SPRN_PA6T_TSR2);
668SYSFS_SPRSETUP(tsr3, SPRN_PA6T_TSR3);
669#endif /* HAS_PPC_PA6T */
670
671#ifdef HAS_PPC_PMC_IBM
672static struct device_attribute ibm_common_attrs[] = {
673 __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
674 __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
675};
676#endif /* HAS_PPC_PMC_IBM */
677
678#ifdef HAS_PPC_PMC_G4
679static struct device_attribute g4_common_attrs[] = {
680 __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
681 __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
682 __ATTR(mmcr2, 0600, show_mmcr2, store_mmcr2),
683};
684#endif /* HAS_PPC_PMC_G4 */
685
686#ifdef HAS_PPC_PMC_CLASSIC
687static struct device_attribute classic_pmc_attrs[] = {
688 __ATTR(pmc1, 0600, show_pmc1, store_pmc1),
689 __ATTR(pmc2, 0600, show_pmc2, store_pmc2),
690 __ATTR(pmc3, 0600, show_pmc3, store_pmc3),
691 __ATTR(pmc4, 0600, show_pmc4, store_pmc4),
692 __ATTR(pmc5, 0600, show_pmc5, store_pmc5),
693 __ATTR(pmc6, 0600, show_pmc6, store_pmc6),
694#ifdef HAS_PPC_PMC56
695 __ATTR(pmc7, 0600, show_pmc7, store_pmc7),
696 __ATTR(pmc8, 0600, show_pmc8, store_pmc8),
697#endif
698};
699#endif
700
701#if defined(HAS_PPC_PMC_PA6T) || defined(HAS_PPC_PA6T)
702static struct device_attribute pa6t_attrs[] = {
703#ifdef HAS_PPC_PMC_PA6T
704 __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
705 __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
706 __ATTR(pmc0, 0600, show_pa6t_pmc0, store_pa6t_pmc0),
707 __ATTR(pmc1, 0600, show_pa6t_pmc1, store_pa6t_pmc1),
708 __ATTR(pmc2, 0600, show_pa6t_pmc2, store_pa6t_pmc2),
709 __ATTR(pmc3, 0600, show_pa6t_pmc3, store_pa6t_pmc3),
710 __ATTR(pmc4, 0600, show_pa6t_pmc4, store_pa6t_pmc4),
711 __ATTR(pmc5, 0600, show_pa6t_pmc5, store_pa6t_pmc5),
712#endif
713#ifdef HAS_PPC_PA6T
714 __ATTR(hid0, 0600, show_hid0, store_hid0),
715 __ATTR(hid1, 0600, show_hid1, store_hid1),
716 __ATTR(hid4, 0600, show_hid4, store_hid4),
717 __ATTR(hid5, 0600, show_hid5, store_hid5),
718 __ATTR(ima0, 0600, show_ima0, store_ima0),
719 __ATTR(ima1, 0600, show_ima1, store_ima1),
720 __ATTR(ima2, 0600, show_ima2, store_ima2),
721 __ATTR(ima3, 0600, show_ima3, store_ima3),
722 __ATTR(ima4, 0600, show_ima4, store_ima4),
723 __ATTR(ima5, 0600, show_ima5, store_ima5),
724 __ATTR(ima6, 0600, show_ima6, store_ima6),
725 __ATTR(ima7, 0600, show_ima7, store_ima7),
726 __ATTR(ima8, 0600, show_ima8, store_ima8),
727 __ATTR(ima9, 0600, show_ima9, store_ima9),
728 __ATTR(imaat, 0600, show_imaat, store_imaat),
729 __ATTR(btcr, 0600, show_btcr, store_btcr),
730 __ATTR(pccr, 0600, show_pccr, store_pccr),
731 __ATTR(rpccr, 0600, show_rpccr, store_rpccr),
732 __ATTR(der, 0600, show_der, store_der),
733 __ATTR(mer, 0600, show_mer, store_mer),
734 __ATTR(ber, 0600, show_ber, store_ber),
735 __ATTR(ier, 0600, show_ier, store_ier),
736 __ATTR(sier, 0600, show_sier, store_sier),
737 __ATTR(siar, 0600, show_siar, store_siar),
738 __ATTR(tsr0, 0600, show_tsr0, store_tsr0),
739 __ATTR(tsr1, 0600, show_tsr1, store_tsr1),
740 __ATTR(tsr2, 0600, show_tsr2, store_tsr2),
741 __ATTR(tsr3, 0600, show_tsr3, store_tsr3),
742#endif /* HAS_PPC_PA6T */
743};
744#endif
745
746#ifdef CONFIG_PPC_SVM
747static ssize_t show_svm(struct device *dev, struct device_attribute *attr, char *buf)
748{
749 return sprintf(buf, "%u\n", is_secure_guest());
750}
751static DEVICE_ATTR(svm, 0444, show_svm, NULL);
752
753static void __init create_svm_file(void)
754{
755 struct device *dev_root = bus_get_dev_root(&cpu_subsys);
756
757 if (dev_root) {
758 device_create_file(dev_root, &dev_attr_svm);
759 put_device(dev_root);
760 }
761}
762#else
763static void __init create_svm_file(void)
764{
765}
766#endif /* CONFIG_PPC_SVM */
767
768#ifdef CONFIG_PPC_PSERIES
769static void read_idle_purr(void *val)
770{
771 u64 *ret = val;
772
773 *ret = read_this_idle_purr();
774}
775
776static ssize_t idle_purr_show(struct device *dev,
777 struct device_attribute *attr, char *buf)
778{
779 struct cpu *cpu = container_of(dev, struct cpu, dev);
780 u64 val;
781
782 smp_call_function_single(cpu->dev.id, read_idle_purr, &val, 1);
783 return sprintf(buf, "%llx\n", val);
784}
785static DEVICE_ATTR(idle_purr, 0400, idle_purr_show, NULL);
786
787static void create_idle_purr_file(struct device *s)
788{
789 if (firmware_has_feature(FW_FEATURE_LPAR))
790 device_create_file(s, &dev_attr_idle_purr);
791}
792
793static void remove_idle_purr_file(struct device *s)
794{
795 if (firmware_has_feature(FW_FEATURE_LPAR))
796 device_remove_file(s, &dev_attr_idle_purr);
797}
798
799static void read_idle_spurr(void *val)
800{
801 u64 *ret = val;
802
803 *ret = read_this_idle_spurr();
804}
805
806static ssize_t idle_spurr_show(struct device *dev,
807 struct device_attribute *attr, char *buf)
808{
809 struct cpu *cpu = container_of(dev, struct cpu, dev);
810 u64 val;
811
812 smp_call_function_single(cpu->dev.id, read_idle_spurr, &val, 1);
813 return sprintf(buf, "%llx\n", val);
814}
815static DEVICE_ATTR(idle_spurr, 0400, idle_spurr_show, NULL);
816
817static void create_idle_spurr_file(struct device *s)
818{
819 if (firmware_has_feature(FW_FEATURE_LPAR))
820 device_create_file(s, &dev_attr_idle_spurr);
821}
822
823static void remove_idle_spurr_file(struct device *s)
824{
825 if (firmware_has_feature(FW_FEATURE_LPAR))
826 device_remove_file(s, &dev_attr_idle_spurr);
827}
828
829#else /* CONFIG_PPC_PSERIES */
830#define create_idle_purr_file(s)
831#define remove_idle_purr_file(s)
832#define create_idle_spurr_file(s)
833#define remove_idle_spurr_file(s)
834#endif /* CONFIG_PPC_PSERIES */
835
836static int register_cpu_online(unsigned int cpu)
837{
838 struct cpu *c = &per_cpu(cpu_devices, cpu);
839 struct device *s = &c->dev;
840 struct device_attribute *attrs, *pmc_attrs;
841 int i, nattrs;
842
843 /* For cpus present at boot a reference was already grabbed in register_cpu() */
844 if (!s->of_node)
845 s->of_node = of_get_cpu_node(cpu, NULL);
846
847#ifdef CONFIG_PPC64
848 if (cpu_has_feature(CPU_FTR_SMT))
849 device_create_file(s, &dev_attr_smt_snooze_delay);
850#endif
851
852 /* PMC stuff */
853 switch (cur_cpu_spec->pmc_type) {
854#ifdef HAS_PPC_PMC_IBM
855 case PPC_PMC_IBM:
856 attrs = ibm_common_attrs;
857 nattrs = ARRAY_SIZE(ibm_common_attrs);
858 pmc_attrs = classic_pmc_attrs;
859 break;
860#endif /* HAS_PPC_PMC_IBM */
861#ifdef HAS_PPC_PMC_G4
862 case PPC_PMC_G4:
863 attrs = g4_common_attrs;
864 nattrs = ARRAY_SIZE(g4_common_attrs);
865 pmc_attrs = classic_pmc_attrs;
866 break;
867#endif /* HAS_PPC_PMC_G4 */
868#if defined(HAS_PPC_PMC_PA6T) || defined(HAS_PPC_PA6T)
869 case PPC_PMC_PA6T:
870 /* PA Semi starts counting at PMC0 */
871 attrs = pa6t_attrs;
872 nattrs = ARRAY_SIZE(pa6t_attrs);
873 pmc_attrs = NULL;
874 break;
875#endif
876 default:
877 attrs = NULL;
878 nattrs = 0;
879 pmc_attrs = NULL;
880 }
881
882 for (i = 0; i < nattrs; i++)
883 device_create_file(device: s, entry: &attrs[i]);
884
885 if (pmc_attrs)
886 for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
887 device_create_file(device: s, entry: &pmc_attrs[i]);
888
889#ifdef CONFIG_PPC64
890#ifdef CONFIG_PMU_SYSFS
891 if (cpu_has_feature(CPU_FTR_MMCRA))
892 device_create_file(s, &dev_attr_mmcra);
893
894 if (cpu_has_feature(CPU_FTR_ARCH_31))
895 device_create_file(s, &dev_attr_mmcr3);
896#endif /* CONFIG_PMU_SYSFS */
897
898 if (cpu_has_feature(CPU_FTR_PURR)) {
899 if (!firmware_has_feature(FW_FEATURE_LPAR))
900 add_write_permission_dev_attr(&dev_attr_purr);
901 device_create_file(s, &dev_attr_purr);
902 create_idle_purr_file(s);
903 }
904
905 if (cpu_has_feature(CPU_FTR_SPURR)) {
906 device_create_file(s, &dev_attr_spurr);
907 create_idle_spurr_file(s);
908 }
909
910 if (cpu_has_feature(CPU_FTR_DSCR))
911 device_create_file(s, &dev_attr_dscr);
912
913 if (cpu_has_feature(CPU_FTR_PPCAS_ARCH_V2))
914 device_create_file(s, &dev_attr_pir);
915
916 if (cpu_has_feature(CPU_FTR_ARCH_206) &&
917 !firmware_has_feature(FW_FEATURE_LPAR))
918 device_create_file(s, &dev_attr_tscr);
919#endif /* CONFIG_PPC64 */
920
921#ifdef CONFIG_PPC_E500
922 if (PVR_VER(cur_cpu_spec->pvr_value) == PVR_VER_E6500) {
923 device_create_file(s, &dev_attr_pw20_state);
924 device_create_file(s, &dev_attr_pw20_wait_time);
925
926 device_create_file(s, &dev_attr_altivec_idle);
927 device_create_file(s, &dev_attr_altivec_idle_wait_time);
928 }
929#endif
930 cacheinfo_cpu_online(cpu_id: cpu);
931 return 0;
932}
933
934#ifdef CONFIG_HOTPLUG_CPU
935static int unregister_cpu_online(unsigned int cpu)
936{
937 struct cpu *c = &per_cpu(cpu_devices, cpu);
938 struct device *s = &c->dev;
939 struct device_attribute *attrs, *pmc_attrs;
940 int i, nattrs;
941
942 if (WARN_RATELIMIT(!c->hotpluggable, "cpu %d can't be offlined\n", cpu))
943 return -EBUSY;
944
945#ifdef CONFIG_PPC64
946 if (cpu_has_feature(CPU_FTR_SMT))
947 device_remove_file(s, &dev_attr_smt_snooze_delay);
948#endif
949
950 /* PMC stuff */
951 switch (cur_cpu_spec->pmc_type) {
952#ifdef HAS_PPC_PMC_IBM
953 case PPC_PMC_IBM:
954 attrs = ibm_common_attrs;
955 nattrs = ARRAY_SIZE(ibm_common_attrs);
956 pmc_attrs = classic_pmc_attrs;
957 break;
958#endif /* HAS_PPC_PMC_IBM */
959#ifdef HAS_PPC_PMC_G4
960 case PPC_PMC_G4:
961 attrs = g4_common_attrs;
962 nattrs = ARRAY_SIZE(g4_common_attrs);
963 pmc_attrs = classic_pmc_attrs;
964 break;
965#endif /* HAS_PPC_PMC_G4 */
966#if defined(HAS_PPC_PMC_PA6T) || defined(HAS_PPC_PA6T)
967 case PPC_PMC_PA6T:
968 /* PA Semi starts counting at PMC0 */
969 attrs = pa6t_attrs;
970 nattrs = ARRAY_SIZE(pa6t_attrs);
971 pmc_attrs = NULL;
972 break;
973#endif
974 default:
975 attrs = NULL;
976 nattrs = 0;
977 pmc_attrs = NULL;
978 }
979
980 for (i = 0; i < nattrs; i++)
981 device_remove_file(dev: s, attr: &attrs[i]);
982
983 if (pmc_attrs)
984 for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
985 device_remove_file(dev: s, attr: &pmc_attrs[i]);
986
987#ifdef CONFIG_PPC64
988#ifdef CONFIG_PMU_SYSFS
989 if (cpu_has_feature(CPU_FTR_MMCRA))
990 device_remove_file(s, &dev_attr_mmcra);
991
992 if (cpu_has_feature(CPU_FTR_ARCH_31))
993 device_remove_file(s, &dev_attr_mmcr3);
994#endif /* CONFIG_PMU_SYSFS */
995
996 if (cpu_has_feature(CPU_FTR_PURR)) {
997 device_remove_file(s, &dev_attr_purr);
998 remove_idle_purr_file(s);
999 }
1000
1001 if (cpu_has_feature(CPU_FTR_SPURR)) {
1002 device_remove_file(s, &dev_attr_spurr);
1003 remove_idle_spurr_file(s);
1004 }
1005
1006 if (cpu_has_feature(CPU_FTR_DSCR))
1007 device_remove_file(s, &dev_attr_dscr);
1008
1009 if (cpu_has_feature(CPU_FTR_PPCAS_ARCH_V2))
1010 device_remove_file(s, &dev_attr_pir);
1011
1012 if (cpu_has_feature(CPU_FTR_ARCH_206) &&
1013 !firmware_has_feature(FW_FEATURE_LPAR))
1014 device_remove_file(s, &dev_attr_tscr);
1015#endif /* CONFIG_PPC64 */
1016
1017#ifdef CONFIG_PPC_E500
1018 if (PVR_VER(cur_cpu_spec->pvr_value) == PVR_VER_E6500) {
1019 device_remove_file(s, &dev_attr_pw20_state);
1020 device_remove_file(s, &dev_attr_pw20_wait_time);
1021
1022 device_remove_file(s, &dev_attr_altivec_idle);
1023 device_remove_file(s, &dev_attr_altivec_idle_wait_time);
1024 }
1025#endif
1026 cacheinfo_cpu_offline(cpu_id: cpu);
1027 of_node_put(node: s->of_node);
1028 s->of_node = NULL;
1029 return 0;
1030}
1031#else /* !CONFIG_HOTPLUG_CPU */
1032#define unregister_cpu_online NULL
1033#endif
1034
1035#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
1036ssize_t arch_cpu_probe(const char *buf, size_t count)
1037{
1038 if (ppc_md.cpu_probe)
1039 return ppc_md.cpu_probe(buf, count);
1040
1041 return -EINVAL;
1042}
1043
1044ssize_t arch_cpu_release(const char *buf, size_t count)
1045{
1046 if (ppc_md.cpu_release)
1047 return ppc_md.cpu_release(buf, count);
1048
1049 return -EINVAL;
1050}
1051#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
1052
1053static DEFINE_MUTEX(cpu_mutex);
1054
1055int cpu_add_dev_attr(struct device_attribute *attr)
1056{
1057 int cpu;
1058
1059 mutex_lock(&cpu_mutex);
1060
1061 for_each_possible_cpu(cpu) {
1062 device_create_file(device: get_cpu_device(cpu), entry: attr);
1063 }
1064
1065 mutex_unlock(lock: &cpu_mutex);
1066 return 0;
1067}
1068EXPORT_SYMBOL_GPL(cpu_add_dev_attr);
1069
1070int cpu_add_dev_attr_group(struct attribute_group *attrs)
1071{
1072 int cpu;
1073 struct device *dev;
1074 int ret;
1075
1076 mutex_lock(&cpu_mutex);
1077
1078 for_each_possible_cpu(cpu) {
1079 dev = get_cpu_device(cpu);
1080 ret = sysfs_create_group(kobj: &dev->kobj, grp: attrs);
1081 WARN_ON(ret != 0);
1082 }
1083
1084 mutex_unlock(lock: &cpu_mutex);
1085 return 0;
1086}
1087EXPORT_SYMBOL_GPL(cpu_add_dev_attr_group);
1088
1089
1090void cpu_remove_dev_attr(struct device_attribute *attr)
1091{
1092 int cpu;
1093
1094 mutex_lock(&cpu_mutex);
1095
1096 for_each_possible_cpu(cpu) {
1097 device_remove_file(dev: get_cpu_device(cpu), attr);
1098 }
1099
1100 mutex_unlock(lock: &cpu_mutex);
1101}
1102EXPORT_SYMBOL_GPL(cpu_remove_dev_attr);
1103
1104void cpu_remove_dev_attr_group(struct attribute_group *attrs)
1105{
1106 int cpu;
1107 struct device *dev;
1108
1109 mutex_lock(&cpu_mutex);
1110
1111 for_each_possible_cpu(cpu) {
1112 dev = get_cpu_device(cpu);
1113 sysfs_remove_group(kobj: &dev->kobj, grp: attrs);
1114 }
1115
1116 mutex_unlock(lock: &cpu_mutex);
1117}
1118EXPORT_SYMBOL_GPL(cpu_remove_dev_attr_group);
1119
1120
1121/* NUMA stuff */
1122
1123#ifdef CONFIG_NUMA
1124int sysfs_add_device_to_node(struct device *dev, int nid)
1125{
1126 struct node *node = node_devices[nid];
1127 return sysfs_create_link(kobj: &node->dev.kobj, target: &dev->kobj,
1128 name: kobject_name(kobj: &dev->kobj));
1129}
1130EXPORT_SYMBOL_GPL(sysfs_add_device_to_node);
1131
1132void sysfs_remove_device_from_node(struct device *dev, int nid)
1133{
1134 struct node *node = node_devices[nid];
1135 sysfs_remove_link(kobj: &node->dev.kobj, name: kobject_name(kobj: &dev->kobj));
1136}
1137EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node);
1138#endif
1139
1140/* Only valid if CPU is present. */
1141static ssize_t show_physical_id(struct device *dev,
1142 struct device_attribute *attr, char *buf)
1143{
1144 struct cpu *cpu = container_of(dev, struct cpu, dev);
1145
1146 return sprintf(buf, fmt: "%d\n", get_hard_smp_processor_id(cpu->dev.id));
1147}
1148static DEVICE_ATTR(physical_id, 0444, show_physical_id, NULL);
1149
1150static int __init topology_init(void)
1151{
1152 int cpu, r;
1153
1154 for_each_possible_cpu(cpu) {
1155 struct cpu *c = &per_cpu(cpu_devices, cpu);
1156
1157#ifdef CONFIG_HOTPLUG_CPU
1158 /*
1159 * For now, we just see if the system supports making
1160 * the RTAS calls for CPU hotplug. But, there may be a
1161 * more comprehensive way to do this for an individual
1162 * CPU. For instance, the boot cpu might never be valid
1163 * for hotplugging.
1164 */
1165 if (smp_ops && smp_ops->cpu_offline_self)
1166 c->hotpluggable = 1;
1167#endif
1168
1169 if (cpu_online(cpu) || c->hotpluggable) {
1170 register_cpu(cpu: c, num: cpu);
1171
1172 device_create_file(device: &c->dev, entry: &dev_attr_physical_id);
1173 }
1174 }
1175 r = cpuhp_setup_state(state: CPUHP_AP_ONLINE_DYN, name: "powerpc/topology:online",
1176 startup: register_cpu_online, teardown: unregister_cpu_online);
1177 WARN_ON(r < 0);
1178#ifdef CONFIG_PPC64
1179 sysfs_create_dscr_default();
1180#endif /* CONFIG_PPC64 */
1181
1182 create_svm_file();
1183
1184 return 0;
1185}
1186subsys_initcall(topology_init);
1187

source code of linux/arch/powerpc/kernel/sysfs.c