Commit | Line | Data |
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3e0a4e85 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
b3d627a5 VS |
2 | /* |
3 | * POWERNV cpufreq driver for the IBM POWER processors | |
4 | * | |
5 | * (C) Copyright IBM 2014 | |
6 | * | |
7 | * Author: Vaidyanathan Srinivasan <svaidy at linux.vnet.ibm.com> | |
b3d627a5 VS |
8 | */ |
9 | ||
10 | #define pr_fmt(fmt) "powernv-cpufreq: " fmt | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/sysfs.h> | |
14 | #include <linux/cpumask.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/cpufreq.h> | |
17 | #include <linux/smp.h> | |
18 | #include <linux/of.h> | |
cf30af76 | 19 | #include <linux/reboot.h> |
053819e0 | 20 | #include <linux/slab.h> |
6d167a44 | 21 | #include <linux/cpu.h> |
332f0a01 | 22 | #include <linux/hashtable.h> |
c89f2682 | 23 | #include <trace/events/power.h> |
b3d627a5 VS |
24 | |
25 | #include <asm/cputhreads.h> | |
6174bac8 | 26 | #include <asm/firmware.h> |
b3d627a5 | 27 | #include <asm/reg.h> |
f3cae355 | 28 | #include <asm/smp.h> /* Required for cpu_sibling_mask() in UP configs */ |
cb166fa9 | 29 | #include <asm/opal.h> |
eaa2c3ae | 30 | #include <linux/timer.h> |
b3d627a5 | 31 | |
332f0a01 GS |
32 | #define POWERNV_MAX_PSTATES_ORDER 8 |
33 | #define POWERNV_MAX_PSTATES (1UL << (POWERNV_MAX_PSTATES_ORDER)) | |
09a972d1 SB |
34 | #define PMSR_PSAFE_ENABLE (1UL << 30) |
35 | #define PMSR_SPR_EM_DISABLE (1UL << 31) | |
ee1f4a7d | 36 | #define MAX_PSTATE_SHIFT 32 |
20b15b76 AA |
37 | #define LPSTATE_SHIFT 48 |
38 | #define GPSTATE_SHIFT 56 | |
b3d627a5 | 39 | |
eaa2c3ae AA |
40 | #define MAX_RAMP_DOWN_TIME 5120 |
41 | /* | |
42 | * On an idle system we want the global pstate to ramp-down from max value to | |
43 | * min over a span of ~5 secs. Also we want it to initially ramp-down slowly and | |
44 | * then ramp-down rapidly later on. | |
45 | * | |
46 | * This gives a percentage rampdown for time elapsed in milliseconds. | |
47 | * ramp_down_percentage = ((ms * ms) >> 18) | |
48 | * ~= 3.8 * (sec * sec) | |
49 | * | |
50 | * At 0 ms ramp_down_percent = 0 | |
51 | * At 5120 ms ramp_down_percent = 100 | |
52 | */ | |
53 | #define ramp_down_percent(time) ((time * time) >> 18) | |
54 | ||
55 | /* Interval after which the timer is queued to bring down global pstate */ | |
56 | #define GPSTATE_TIMER_INTERVAL 2000 | |
57 | ||
58 | /** | |
59 | * struct global_pstate_info - Per policy data structure to maintain history of | |
60 | * global pstates | |
09ca4c9b AA |
61 | * @highest_lpstate_idx: The local pstate index from which we are |
62 | * ramping down | |
eaa2c3ae | 63 | * @elapsed_time: Time in ms spent in ramping down from |
09ca4c9b | 64 | * highest_lpstate_idx |
eaa2c3ae AA |
65 | * @last_sampled_time: Time from boot in ms when global pstates were |
66 | * last set | |
44bd9a30 LJ |
67 | * @last_lpstate_idx: Last set value of local pstate and global |
68 | * @last_gpstate_idx: pstate in terms of cpufreq table index | |
eaa2c3ae AA |
69 | * @timer: Is used for ramping down if cpu goes idle for |
70 | * a long time with global pstate held high | |
71 | * @gpstate_lock: A spinlock to maintain synchronization between | |
72 | * routines called by the timer handler and | |
73 | * governer's target_index calls | |
44bd9a30 | 74 | * @policy: Associated CPUFreq policy |
eaa2c3ae AA |
75 | */ |
76 | struct global_pstate_info { | |
09ca4c9b | 77 | int highest_lpstate_idx; |
eaa2c3ae AA |
78 | unsigned int elapsed_time; |
79 | unsigned int last_sampled_time; | |
09ca4c9b AA |
80 | int last_lpstate_idx; |
81 | int last_gpstate_idx; | |
eaa2c3ae AA |
82 | spinlock_t gpstate_lock; |
83 | struct timer_list timer; | |
1d1fe902 | 84 | struct cpufreq_policy *policy; |
eaa2c3ae AA |
85 | }; |
86 | ||
b3d627a5 | 87 | static struct cpufreq_frequency_table powernv_freqs[POWERNV_MAX_PSTATES+1]; |
332f0a01 | 88 | |
133c6c84 | 89 | static DEFINE_HASHTABLE(pstate_revmap, POWERNV_MAX_PSTATES_ORDER); |
332f0a01 GS |
90 | /** |
91 | * struct pstate_idx_revmap_data: Entry in the hashmap pstate_revmap | |
92 | * indexed by a function of pstate id. | |
93 | * | |
94 | * @pstate_id: pstate id for this entry. | |
95 | * | |
96 | * @cpufreq_table_idx: Index into the powernv_freqs | |
97 | * cpufreq_frequency_table for frequency | |
98 | * corresponding to pstate_id. | |
99 | * | |
100 | * @hentry: hlist_node that hooks this entry into the pstate_revmap | |
101 | * hashtable | |
102 | */ | |
103 | struct pstate_idx_revmap_data { | |
967b87fd | 104 | u8 pstate_id; |
332f0a01 GS |
105 | unsigned int cpufreq_table_idx; |
106 | struct hlist_node hentry; | |
107 | }; | |
108 | ||
cb166fa9 | 109 | static bool rebooting, throttled, occ_reset; |
b3d627a5 | 110 | |
c89f2682 SB |
111 | static const char * const throttle_reason[] = { |
112 | "No throttling", | |
113 | "Power Cap", | |
114 | "Processor Over Temperature", | |
115 | "Power Supply Failure", | |
116 | "Over Current", | |
117 | "OCC Reset" | |
118 | }; | |
119 | ||
1b028984 SB |
120 | enum throttle_reason_type { |
121 | NO_THROTTLE = 0, | |
122 | POWERCAP, | |
123 | CPU_OVERTEMP, | |
124 | POWER_SUPPLY_FAILURE, | |
125 | OVERCURRENT, | |
126 | OCC_RESET_THROTTLE, | |
127 | OCC_MAX_REASON | |
128 | }; | |
129 | ||
053819e0 SB |
130 | static struct chip { |
131 | unsigned int id; | |
132 | bool throttled; | |
c89f2682 SB |
133 | bool restore; |
134 | u8 throttle_reason; | |
735366fc SB |
135 | cpumask_t mask; |
136 | struct work_struct throttle; | |
1b028984 SB |
137 | int throttle_turbo; |
138 | int throttle_sub_turbo; | |
139 | int reason[OCC_MAX_REASON]; | |
053819e0 SB |
140 | } *chips; |
141 | ||
142 | static int nr_chips; | |
3e5963bc | 143 | static DEFINE_PER_CPU(struct chip *, chip_info); |
053819e0 | 144 | |
b3d627a5 | 145 | /* |
09ca4c9b AA |
146 | * Note: |
147 | * The set of pstates consists of contiguous integers. | |
148 | * powernv_pstate_info stores the index of the frequency table for | |
149 | * max, min and nominal frequencies. It also stores number of | |
150 | * available frequencies. | |
b3d627a5 | 151 | * |
09ca4c9b AA |
152 | * powernv_pstate_info.nominal indicates the index to the highest |
153 | * non-turbo frequency. | |
b3d627a5 VS |
154 | */ |
155 | static struct powernv_pstate_info { | |
09ca4c9b AA |
156 | unsigned int min; |
157 | unsigned int max; | |
158 | unsigned int nominal; | |
159 | unsigned int nr_pstates; | |
b12f7a2b | 160 | bool wof_enabled; |
b3d627a5 VS |
161 | } powernv_pstate_info; |
162 | ||
967b87fd | 163 | static inline u8 extract_pstate(u64 pmsr_val, unsigned int shift) |
ee1f4a7d | 164 | { |
967b87fd | 165 | return ((pmsr_val >> shift) & 0xFF); |
ee1f4a7d GS |
166 | } |
167 | ||
168 | #define extract_local_pstate(x) extract_pstate(x, LPSTATE_SHIFT) | |
169 | #define extract_global_pstate(x) extract_pstate(x, GPSTATE_SHIFT) | |
170 | #define extract_max_pstate(x) extract_pstate(x, MAX_PSTATE_SHIFT) | |
171 | ||
332f0a01 GS |
172 | /* Use following functions for conversions between pstate_id and index */ |
173 | ||
44bd9a30 | 174 | /* |
332f0a01 GS |
175 | * idx_to_pstate : Returns the pstate id corresponding to the |
176 | * frequency in the cpufreq frequency table | |
177 | * powernv_freqs indexed by @i. | |
178 | * | |
179 | * If @i is out of bound, this will return the pstate | |
180 | * corresponding to the nominal frequency. | |
181 | */ | |
967b87fd | 182 | static inline u8 idx_to_pstate(unsigned int i) |
09ca4c9b | 183 | { |
8e859467 | 184 | if (unlikely(i >= powernv_pstate_info.nr_pstates)) { |
332f0a01 | 185 | pr_warn_once("idx_to_pstate: index %u is out of bound\n", i); |
8e859467 AA |
186 | return powernv_freqs[powernv_pstate_info.nominal].driver_data; |
187 | } | |
188 | ||
09ca4c9b AA |
189 | return powernv_freqs[i].driver_data; |
190 | } | |
191 | ||
44bd9a30 | 192 | /* |
332f0a01 GS |
193 | * pstate_to_idx : Returns the index in the cpufreq frequencytable |
194 | * powernv_freqs for the frequency whose corresponding | |
195 | * pstate id is @pstate. | |
196 | * | |
197 | * If no frequency corresponding to @pstate is found, | |
198 | * this will return the index of the nominal | |
199 | * frequency. | |
200 | */ | |
967b87fd | 201 | static unsigned int pstate_to_idx(u8 pstate) |
09ca4c9b | 202 | { |
332f0a01 GS |
203 | unsigned int key = pstate % POWERNV_MAX_PSTATES; |
204 | struct pstate_idx_revmap_data *revmap_data; | |
8e859467 | 205 | |
332f0a01 GS |
206 | hash_for_each_possible(pstate_revmap, revmap_data, hentry, key) { |
207 | if (revmap_data->pstate_id == pstate) | |
208 | return revmap_data->cpufreq_table_idx; | |
8e859467 | 209 | } |
332f0a01 | 210 | |
967b87fd | 211 | pr_warn_once("pstate_to_idx: pstate 0x%x not found\n", pstate); |
332f0a01 | 212 | return powernv_pstate_info.nominal; |
09ca4c9b AA |
213 | } |
214 | ||
eaa2c3ae AA |
215 | static inline void reset_gpstates(struct cpufreq_policy *policy) |
216 | { | |
217 | struct global_pstate_info *gpstates = policy->driver_data; | |
218 | ||
09ca4c9b | 219 | gpstates->highest_lpstate_idx = 0; |
eaa2c3ae AA |
220 | gpstates->elapsed_time = 0; |
221 | gpstates->last_sampled_time = 0; | |
09ca4c9b AA |
222 | gpstates->last_lpstate_idx = 0; |
223 | gpstates->last_gpstate_idx = 0; | |
eaa2c3ae AA |
224 | } |
225 | ||
b3d627a5 VS |
226 | /* |
227 | * Initialize the freq table based on data obtained | |
228 | * from the firmware passed via device-tree | |
229 | */ | |
230 | static int init_powernv_pstates(void) | |
231 | { | |
232 | struct device_node *power_mgt; | |
09ca4c9b | 233 | int i, nr_pstates = 0; |
b3d627a5 VS |
234 | const __be32 *pstate_ids, *pstate_freqs; |
235 | u32 len_ids, len_freqs; | |
09ca4c9b | 236 | u32 pstate_min, pstate_max, pstate_nominal; |
b12f7a2b | 237 | u32 pstate_turbo, pstate_ultra_turbo; |
5ae06c23 | 238 | int rc = -ENODEV; |
b3d627a5 VS |
239 | |
240 | power_mgt = of_find_node_by_path("/ibm,opal/power-mgt"); | |
241 | if (!power_mgt) { | |
242 | pr_warn("power-mgt node not found\n"); | |
243 | return -ENODEV; | |
244 | } | |
245 | ||
246 | if (of_property_read_u32(power_mgt, "ibm,pstate-min", &pstate_min)) { | |
247 | pr_warn("ibm,pstate-min node not found\n"); | |
3be466d6 | 248 | goto out; |
b3d627a5 VS |
249 | } |
250 | ||
251 | if (of_property_read_u32(power_mgt, "ibm,pstate-max", &pstate_max)) { | |
252 | pr_warn("ibm,pstate-max node not found\n"); | |
3be466d6 | 253 | goto out; |
b3d627a5 VS |
254 | } |
255 | ||
256 | if (of_property_read_u32(power_mgt, "ibm,pstate-nominal", | |
257 | &pstate_nominal)) { | |
258 | pr_warn("ibm,pstate-nominal not found\n"); | |
3be466d6 | 259 | goto out; |
b3d627a5 | 260 | } |
b12f7a2b SB |
261 | |
262 | if (of_property_read_u32(power_mgt, "ibm,pstate-ultra-turbo", | |
263 | &pstate_ultra_turbo)) { | |
264 | powernv_pstate_info.wof_enabled = false; | |
265 | goto next; | |
266 | } | |
267 | ||
268 | if (of_property_read_u32(power_mgt, "ibm,pstate-turbo", | |
269 | &pstate_turbo)) { | |
270 | powernv_pstate_info.wof_enabled = false; | |
271 | goto next; | |
272 | } | |
273 | ||
274 | if (pstate_turbo == pstate_ultra_turbo) | |
275 | powernv_pstate_info.wof_enabled = false; | |
276 | else | |
277 | powernv_pstate_info.wof_enabled = true; | |
278 | ||
279 | next: | |
967b87fd | 280 | pr_info("cpufreq pstate min 0x%x nominal 0x%x max 0x%x\n", pstate_min, |
b3d627a5 | 281 | pstate_nominal, pstate_max); |
b12f7a2b SB |
282 | pr_info("Workload Optimized Frequency is %s in the platform\n", |
283 | (powernv_pstate_info.wof_enabled) ? "enabled" : "disabled"); | |
b3d627a5 VS |
284 | |
285 | pstate_ids = of_get_property(power_mgt, "ibm,pstate-ids", &len_ids); | |
286 | if (!pstate_ids) { | |
287 | pr_warn("ibm,pstate-ids not found\n"); | |
3be466d6 | 288 | goto out; |
b3d627a5 VS |
289 | } |
290 | ||
291 | pstate_freqs = of_get_property(power_mgt, "ibm,pstate-frequencies-mhz", | |
292 | &len_freqs); | |
293 | if (!pstate_freqs) { | |
294 | pr_warn("ibm,pstate-frequencies-mhz not found\n"); | |
3be466d6 | 295 | goto out; |
b3d627a5 VS |
296 | } |
297 | ||
6174bac8 VS |
298 | if (len_ids != len_freqs) { |
299 | pr_warn("Entries in ibm,pstate-ids and " | |
300 | "ibm,pstate-frequencies-mhz does not match\n"); | |
301 | } | |
302 | ||
b3d627a5 VS |
303 | nr_pstates = min(len_ids, len_freqs) / sizeof(u32); |
304 | if (!nr_pstates) { | |
305 | pr_warn("No PStates found\n"); | |
3be466d6 | 306 | goto out; |
b3d627a5 VS |
307 | } |
308 | ||
09ca4c9b | 309 | powernv_pstate_info.nr_pstates = nr_pstates; |
b3d627a5 | 310 | pr_debug("NR PStates %d\n", nr_pstates); |
ee1f4a7d | 311 | |
b3d627a5 VS |
312 | for (i = 0; i < nr_pstates; i++) { |
313 | u32 id = be32_to_cpu(pstate_ids[i]); | |
314 | u32 freq = be32_to_cpu(pstate_freqs[i]); | |
332f0a01 GS |
315 | struct pstate_idx_revmap_data *revmap_data; |
316 | unsigned int key; | |
b3d627a5 VS |
317 | |
318 | pr_debug("PState id %d freq %d MHz\n", id, freq); | |
319 | powernv_freqs[i].frequency = freq * 1000; /* kHz */ | |
967b87fd | 320 | powernv_freqs[i].driver_data = id & 0xFF; |
09ca4c9b | 321 | |
5ae06c23 YL |
322 | revmap_data = kmalloc(sizeof(*revmap_data), GFP_KERNEL); |
323 | if (!revmap_data) { | |
324 | rc = -ENOMEM; | |
325 | goto out; | |
326 | } | |
332f0a01 | 327 | |
967b87fd | 328 | revmap_data->pstate_id = id & 0xFF; |
332f0a01 | 329 | revmap_data->cpufreq_table_idx = i; |
967b87fd | 330 | key = (revmap_data->pstate_id) % POWERNV_MAX_PSTATES; |
332f0a01 GS |
331 | hash_add(pstate_revmap, &revmap_data->hentry, key); |
332 | ||
09ca4c9b AA |
333 | if (id == pstate_max) |
334 | powernv_pstate_info.max = i; | |
3fa4680b | 335 | if (id == pstate_nominal) |
09ca4c9b | 336 | powernv_pstate_info.nominal = i; |
3fa4680b | 337 | if (id == pstate_min) |
09ca4c9b | 338 | powernv_pstate_info.min = i; |
b12f7a2b SB |
339 | |
340 | if (powernv_pstate_info.wof_enabled && id == pstate_turbo) { | |
341 | int j; | |
342 | ||
343 | for (j = i - 1; j >= (int)powernv_pstate_info.max; j--) | |
344 | powernv_freqs[j].flags = CPUFREQ_BOOST_FREQ; | |
345 | } | |
b3d627a5 | 346 | } |
09ca4c9b | 347 | |
b3d627a5 VS |
348 | /* End of list marker entry */ |
349 | powernv_freqs[i].frequency = CPUFREQ_TABLE_END; | |
3be466d6 YL |
350 | |
351 | of_node_put(power_mgt); | |
b3d627a5 | 352 | return 0; |
3be466d6 YL |
353 | out: |
354 | of_node_put(power_mgt); | |
5ae06c23 | 355 | return rc; |
b3d627a5 VS |
356 | } |
357 | ||
358 | /* Returns the CPU frequency corresponding to the pstate_id. */ | |
967b87fd | 359 | static unsigned int pstate_id_to_freq(u8 pstate_id) |
b3d627a5 VS |
360 | { |
361 | int i; | |
362 | ||
09ca4c9b | 363 | i = pstate_to_idx(pstate_id); |
6174bac8 | 364 | if (i >= powernv_pstate_info.nr_pstates || i < 0) { |
967b87fd | 365 | pr_warn("PState id 0x%x outside of PState table, reporting nominal id 0x%x instead\n", |
09ca4c9b AA |
366 | pstate_id, idx_to_pstate(powernv_pstate_info.nominal)); |
367 | i = powernv_pstate_info.nominal; | |
6174bac8 | 368 | } |
b3d627a5 VS |
369 | |
370 | return powernv_freqs[i].frequency; | |
371 | } | |
372 | ||
373 | /* | |
374 | * cpuinfo_nominal_freq_show - Show the nominal CPU frequency as indicated by | |
375 | * the firmware | |
376 | */ | |
377 | static ssize_t cpuinfo_nominal_freq_show(struct cpufreq_policy *policy, | |
378 | char *buf) | |
379 | { | |
380 | return sprintf(buf, "%u\n", | |
09ca4c9b | 381 | powernv_freqs[powernv_pstate_info.nominal].frequency); |
b3d627a5 VS |
382 | } |
383 | ||
133c6c84 | 384 | static struct freq_attr cpufreq_freq_attr_cpuinfo_nominal_freq = |
b3d627a5 VS |
385 | __ATTR_RO(cpuinfo_nominal_freq); |
386 | ||
b12f7a2b SB |
387 | #define SCALING_BOOST_FREQS_ATTR_INDEX 2 |
388 | ||
b3d627a5 VS |
389 | static struct freq_attr *powernv_cpu_freq_attr[] = { |
390 | &cpufreq_freq_attr_scaling_available_freqs, | |
391 | &cpufreq_freq_attr_cpuinfo_nominal_freq, | |
b12f7a2b | 392 | &cpufreq_freq_attr_scaling_boost_freqs, |
b3d627a5 VS |
393 | NULL, |
394 | }; | |
395 | ||
1b028984 SB |
396 | #define throttle_attr(name, member) \ |
397 | static ssize_t name##_show(struct cpufreq_policy *policy, char *buf) \ | |
398 | { \ | |
399 | struct chip *chip = per_cpu(chip_info, policy->cpu); \ | |
400 | \ | |
401 | return sprintf(buf, "%u\n", chip->member); \ | |
402 | } \ | |
403 | \ | |
404 | static struct freq_attr throttle_attr_##name = __ATTR_RO(name) \ | |
405 | ||
406 | throttle_attr(unthrottle, reason[NO_THROTTLE]); | |
407 | throttle_attr(powercap, reason[POWERCAP]); | |
408 | throttle_attr(overtemp, reason[CPU_OVERTEMP]); | |
409 | throttle_attr(supply_fault, reason[POWER_SUPPLY_FAILURE]); | |
410 | throttle_attr(overcurrent, reason[OVERCURRENT]); | |
411 | throttle_attr(occ_reset, reason[OCC_RESET_THROTTLE]); | |
412 | throttle_attr(turbo_stat, throttle_turbo); | |
413 | throttle_attr(sub_turbo_stat, throttle_sub_turbo); | |
414 | ||
415 | static struct attribute *throttle_attrs[] = { | |
416 | &throttle_attr_unthrottle.attr, | |
417 | &throttle_attr_powercap.attr, | |
418 | &throttle_attr_overtemp.attr, | |
419 | &throttle_attr_supply_fault.attr, | |
420 | &throttle_attr_overcurrent.attr, | |
421 | &throttle_attr_occ_reset.attr, | |
422 | &throttle_attr_turbo_stat.attr, | |
423 | &throttle_attr_sub_turbo_stat.attr, | |
424 | NULL, | |
425 | }; | |
426 | ||
427 | static const struct attribute_group throttle_attr_grp = { | |
428 | .name = "throttle_stats", | |
429 | .attrs = throttle_attrs, | |
430 | }; | |
431 | ||
b3d627a5 VS |
432 | /* Helper routines */ |
433 | ||
434 | /* Access helpers to power mgt SPR */ | |
435 | ||
436 | static inline unsigned long get_pmspr(unsigned long sprn) | |
437 | { | |
438 | switch (sprn) { | |
439 | case SPRN_PMCR: | |
440 | return mfspr(SPRN_PMCR); | |
441 | ||
442 | case SPRN_PMICR: | |
443 | return mfspr(SPRN_PMICR); | |
444 | ||
445 | case SPRN_PMSR: | |
446 | return mfspr(SPRN_PMSR); | |
447 | } | |
448 | BUG(); | |
449 | } | |
450 | ||
451 | static inline void set_pmspr(unsigned long sprn, unsigned long val) | |
452 | { | |
453 | switch (sprn) { | |
454 | case SPRN_PMCR: | |
455 | mtspr(SPRN_PMCR, val); | |
456 | return; | |
457 | ||
458 | case SPRN_PMICR: | |
459 | mtspr(SPRN_PMICR, val); | |
460 | return; | |
461 | } | |
462 | BUG(); | |
463 | } | |
464 | ||
465 | /* | |
466 | * Use objects of this type to query/update | |
467 | * pstates on a remote CPU via smp_call_function. | |
468 | */ | |
469 | struct powernv_smp_call_data { | |
470 | unsigned int freq; | |
967b87fd GS |
471 | u8 pstate_id; |
472 | u8 gpstate_id; | |
b3d627a5 VS |
473 | }; |
474 | ||
475 | /* | |
476 | * powernv_read_cpu_freq: Reads the current frequency on this CPU. | |
477 | * | |
478 | * Called via smp_call_function. | |
479 | * | |
480 | * Note: The caller of the smp_call_function should pass an argument of | |
481 | * the type 'struct powernv_smp_call_data *' along with this function. | |
482 | * | |
483 | * The current frequency on this CPU will be returned via | |
484 | * ((struct powernv_smp_call_data *)arg)->freq; | |
485 | */ | |
486 | static void powernv_read_cpu_freq(void *arg) | |
487 | { | |
488 | unsigned long pmspr_val; | |
b3d627a5 VS |
489 | struct powernv_smp_call_data *freq_data = arg; |
490 | ||
491 | pmspr_val = get_pmspr(SPRN_PMSR); | |
ee1f4a7d | 492 | freq_data->pstate_id = extract_local_pstate(pmspr_val); |
b3d627a5 VS |
493 | freq_data->freq = pstate_id_to_freq(freq_data->pstate_id); |
494 | ||
967b87fd GS |
495 | pr_debug("cpu %d pmsr %016lX pstate_id 0x%x frequency %d kHz\n", |
496 | raw_smp_processor_id(), pmspr_val, freq_data->pstate_id, | |
497 | freq_data->freq); | |
b3d627a5 VS |
498 | } |
499 | ||
500 | /* | |
501 | * powernv_cpufreq_get: Returns the CPU frequency as reported by the | |
502 | * firmware for CPU 'cpu'. This value is reported through the sysfs | |
503 | * file cpuinfo_cur_freq. | |
504 | */ | |
60d1ea4e | 505 | static unsigned int powernv_cpufreq_get(unsigned int cpu) |
b3d627a5 VS |
506 | { |
507 | struct powernv_smp_call_data freq_data; | |
508 | ||
509 | smp_call_function_any(cpu_sibling_mask(cpu), powernv_read_cpu_freq, | |
510 | &freq_data, 1); | |
511 | ||
512 | return freq_data.freq; | |
513 | } | |
514 | ||
515 | /* | |
516 | * set_pstate: Sets the pstate on this CPU. | |
517 | * | |
518 | * This is called via an smp_call_function. | |
519 | * | |
520 | * The caller must ensure that freq_data is of the type | |
521 | * (struct powernv_smp_call_data *) and the pstate_id which needs to be set | |
522 | * on this CPU should be present in freq_data->pstate_id. | |
523 | */ | |
eaa2c3ae | 524 | static void set_pstate(void *data) |
b3d627a5 VS |
525 | { |
526 | unsigned long val; | |
eaa2c3ae AA |
527 | struct powernv_smp_call_data *freq_data = data; |
528 | unsigned long pstate_ul = freq_data->pstate_id; | |
529 | unsigned long gpstate_ul = freq_data->gpstate_id; | |
b3d627a5 VS |
530 | |
531 | val = get_pmspr(SPRN_PMCR); | |
532 | val = val & 0x0000FFFFFFFFFFFFULL; | |
533 | ||
534 | pstate_ul = pstate_ul & 0xFF; | |
eaa2c3ae | 535 | gpstate_ul = gpstate_ul & 0xFF; |
b3d627a5 VS |
536 | |
537 | /* Set both global(bits 56..63) and local(bits 48..55) PStates */ | |
eaa2c3ae | 538 | val = val | (gpstate_ul << 56) | (pstate_ul << 48); |
b3d627a5 VS |
539 | |
540 | pr_debug("Setting cpu %d pmcr to %016lX\n", | |
541 | raw_smp_processor_id(), val); | |
542 | set_pmspr(SPRN_PMCR, val); | |
543 | } | |
544 | ||
cf30af76 SB |
545 | /* |
546 | * get_nominal_index: Returns the index corresponding to the nominal | |
547 | * pstate in the cpufreq table | |
548 | */ | |
549 | static inline unsigned int get_nominal_index(void) | |
550 | { | |
09ca4c9b | 551 | return powernv_pstate_info.nominal; |
cf30af76 SB |
552 | } |
553 | ||
735366fc | 554 | static void powernv_cpufreq_throttle_check(void *data) |
09a972d1 | 555 | { |
3e5963bc | 556 | struct chip *chip; |
735366fc | 557 | unsigned int cpu = smp_processor_id(); |
09a972d1 | 558 | unsigned long pmsr; |
967b87fd | 559 | u8 pmsr_pmax; |
09ca4c9b | 560 | unsigned int pmsr_pmax_idx; |
09a972d1 SB |
561 | |
562 | pmsr = get_pmspr(SPRN_PMSR); | |
3e5963bc | 563 | chip = this_cpu_read(chip_info); |
053819e0 | 564 | |
09a972d1 | 565 | /* Check for Pmax Capping */ |
ee1f4a7d | 566 | pmsr_pmax = extract_max_pstate(pmsr); |
09ca4c9b AA |
567 | pmsr_pmax_idx = pstate_to_idx(pmsr_pmax); |
568 | if (pmsr_pmax_idx != powernv_pstate_info.max) { | |
3e5963bc | 569 | if (chip->throttled) |
053819e0 | 570 | goto next; |
3e5963bc | 571 | chip->throttled = true; |
09ca4c9b | 572 | if (pmsr_pmax_idx > powernv_pstate_info.nominal) { |
967b87fd | 573 | pr_warn_once("CPU %d on Chip %u has Pmax(0x%x) reduced below that of nominal frequency(0x%x)\n", |
3e5963bc | 574 | cpu, chip->id, pmsr_pmax, |
09ca4c9b | 575 | idx_to_pstate(powernv_pstate_info.nominal)); |
1b028984 SB |
576 | chip->throttle_sub_turbo++; |
577 | } else { | |
578 | chip->throttle_turbo++; | |
579 | } | |
3e5963bc MN |
580 | trace_powernv_throttle(chip->id, |
581 | throttle_reason[chip->throttle_reason], | |
c89f2682 | 582 | pmsr_pmax); |
3e5963bc MN |
583 | } else if (chip->throttled) { |
584 | chip->throttled = false; | |
585 | trace_powernv_throttle(chip->id, | |
586 | throttle_reason[chip->throttle_reason], | |
c89f2682 | 587 | pmsr_pmax); |
09a972d1 SB |
588 | } |
589 | ||
3dd3ebe5 | 590 | /* Check if Psafe_mode_active is set in PMSR. */ |
053819e0 | 591 | next: |
3dd3ebe5 | 592 | if (pmsr & PMSR_PSAFE_ENABLE) { |
09a972d1 SB |
593 | throttled = true; |
594 | pr_info("Pstate set to safe frequency\n"); | |
595 | } | |
596 | ||
597 | /* Check if SPR_EM_DISABLE is set in PMSR */ | |
598 | if (pmsr & PMSR_SPR_EM_DISABLE) { | |
599 | throttled = true; | |
600 | pr_info("Frequency Control disabled from OS\n"); | |
601 | } | |
602 | ||
603 | if (throttled) { | |
604 | pr_info("PMSR = %16lx\n", pmsr); | |
c89f2682 | 605 | pr_warn("CPU Frequency could be throttled\n"); |
09a972d1 SB |
606 | } |
607 | } | |
608 | ||
eaa2c3ae AA |
609 | /** |
610 | * calc_global_pstate - Calculate global pstate | |
09ca4c9b AA |
611 | * @elapsed_time: Elapsed time in milliseconds |
612 | * @local_pstate_idx: New local pstate | |
613 | * @highest_lpstate_idx: pstate from which its ramping down | |
eaa2c3ae AA |
614 | * |
615 | * Finds the appropriate global pstate based on the pstate from which its | |
616 | * ramping down and the time elapsed in ramping down. It follows a quadratic | |
617 | * equation which ensures that it reaches ramping down to pmin in 5sec. | |
618 | */ | |
619 | static inline int calc_global_pstate(unsigned int elapsed_time, | |
09ca4c9b AA |
620 | int highest_lpstate_idx, |
621 | int local_pstate_idx) | |
eaa2c3ae | 622 | { |
09ca4c9b | 623 | int index_diff; |
eaa2c3ae AA |
624 | |
625 | /* | |
626 | * Using ramp_down_percent we get the percentage of rampdown | |
627 | * that we are expecting to be dropping. Difference between | |
09ca4c9b | 628 | * highest_lpstate_idx and powernv_pstate_info.min will give a absolute |
eaa2c3ae AA |
629 | * number of how many pstates we will drop eventually by the end of |
630 | * 5 seconds, then just scale it get the number pstates to be dropped. | |
631 | */ | |
09ca4c9b AA |
632 | index_diff = ((int)ramp_down_percent(elapsed_time) * |
633 | (powernv_pstate_info.min - highest_lpstate_idx)) / 100; | |
eaa2c3ae AA |
634 | |
635 | /* Ensure that global pstate is >= to local pstate */ | |
09ca4c9b AA |
636 | if (highest_lpstate_idx + index_diff >= local_pstate_idx) |
637 | return local_pstate_idx; | |
eaa2c3ae | 638 | else |
09ca4c9b | 639 | return highest_lpstate_idx + index_diff; |
eaa2c3ae AA |
640 | } |
641 | ||
642 | static inline void queue_gpstate_timer(struct global_pstate_info *gpstates) | |
643 | { | |
644 | unsigned int timer_interval; | |
645 | ||
646 | /* | |
647 | * Setting up timer to fire after GPSTATE_TIMER_INTERVAL ms, But | |
648 | * if it exceeds MAX_RAMP_DOWN_TIME ms for ramp down time. | |
649 | * Set timer such that it fires exactly at MAX_RAMP_DOWN_TIME | |
650 | * seconds of ramp down time. | |
651 | */ | |
652 | if ((gpstates->elapsed_time + GPSTATE_TIMER_INTERVAL) | |
653 | > MAX_RAMP_DOWN_TIME) | |
654 | timer_interval = MAX_RAMP_DOWN_TIME - gpstates->elapsed_time; | |
655 | else | |
656 | timer_interval = GPSTATE_TIMER_INTERVAL; | |
657 | ||
7bc54b65 | 658 | mod_timer(&gpstates->timer, jiffies + msecs_to_jiffies(timer_interval)); |
eaa2c3ae AA |
659 | } |
660 | ||
661 | /** | |
662 | * gpstate_timer_handler | |
663 | * | |
44bd9a30 | 664 | * @t: Timer context used to fetch global pstate info struct |
eaa2c3ae AA |
665 | * |
666 | * This handler brings down the global pstate closer to the local pstate | |
667 | * according quadratic equation. Queues a new timer if it is still not equal | |
668 | * to local pstate | |
669 | */ | |
133c6c84 | 670 | static void gpstate_timer_handler(struct timer_list *t) |
eaa2c3ae | 671 | { |
1d1fe902 KC |
672 | struct global_pstate_info *gpstates = from_timer(gpstates, t, timer); |
673 | struct cpufreq_policy *policy = gpstates->policy; | |
20b15b76 AA |
674 | int gpstate_idx, lpstate_idx; |
675 | unsigned long val; | |
eaa2c3ae AA |
676 | unsigned int time_diff = jiffies_to_msecs(jiffies) |
677 | - gpstates->last_sampled_time; | |
678 | struct powernv_smp_call_data freq_data; | |
679 | ||
680 | if (!spin_trylock(&gpstates->gpstate_lock)) | |
681 | return; | |
c0f7f5b6 SB |
682 | /* |
683 | * If the timer has migrated to the different cpu then bring | |
684 | * it back to one of the policy->cpus | |
685 | */ | |
686 | if (!cpumask_test_cpu(raw_smp_processor_id(), policy->cpus)) { | |
687 | gpstates->timer.expires = jiffies + msecs_to_jiffies(1); | |
688 | add_timer_on(&gpstates->timer, cpumask_first(policy->cpus)); | |
689 | spin_unlock(&gpstates->gpstate_lock); | |
690 | return; | |
691 | } | |
eaa2c3ae | 692 | |
20b15b76 AA |
693 | /* |
694 | * If PMCR was last updated was using fast_swtich then | |
695 | * We may have wrong in gpstate->last_lpstate_idx | |
696 | * value. Hence, read from PMCR to get correct data. | |
697 | */ | |
698 | val = get_pmspr(SPRN_PMCR); | |
ee1f4a7d GS |
699 | freq_data.gpstate_id = extract_global_pstate(val); |
700 | freq_data.pstate_id = extract_local_pstate(val); | |
20b15b76 AA |
701 | if (freq_data.gpstate_id == freq_data.pstate_id) { |
702 | reset_gpstates(policy); | |
703 | spin_unlock(&gpstates->gpstate_lock); | |
704 | return; | |
705 | } | |
706 | ||
eaa2c3ae AA |
707 | gpstates->last_sampled_time += time_diff; |
708 | gpstates->elapsed_time += time_diff; | |
eaa2c3ae | 709 | |
20b15b76 | 710 | if (gpstates->elapsed_time > MAX_RAMP_DOWN_TIME) { |
09ca4c9b | 711 | gpstate_idx = pstate_to_idx(freq_data.pstate_id); |
c9a81e68 | 712 | lpstate_idx = gpstate_idx; |
eaa2c3ae | 713 | reset_gpstates(policy); |
09ca4c9b | 714 | gpstates->highest_lpstate_idx = gpstate_idx; |
eaa2c3ae | 715 | } else { |
20b15b76 | 716 | lpstate_idx = pstate_to_idx(freq_data.pstate_id); |
09ca4c9b AA |
717 | gpstate_idx = calc_global_pstate(gpstates->elapsed_time, |
718 | gpstates->highest_lpstate_idx, | |
20b15b76 | 719 | lpstate_idx); |
eaa2c3ae | 720 | } |
20b15b76 AA |
721 | freq_data.gpstate_id = idx_to_pstate(gpstate_idx); |
722 | gpstates->last_gpstate_idx = gpstate_idx; | |
723 | gpstates->last_lpstate_idx = lpstate_idx; | |
eaa2c3ae AA |
724 | /* |
725 | * If local pstate is equal to global pstate, rampdown is over | |
726 | * So timer is not required to be queued. | |
727 | */ | |
09ca4c9b | 728 | if (gpstate_idx != gpstates->last_lpstate_idx) |
eaa2c3ae AA |
729 | queue_gpstate_timer(gpstates); |
730 | ||
c0f7f5b6 | 731 | set_pstate(&freq_data); |
1fd3ff28 | 732 | spin_unlock(&gpstates->gpstate_lock); |
eaa2c3ae AA |
733 | } |
734 | ||
b3d627a5 VS |
735 | /* |
736 | * powernv_cpufreq_target_index: Sets the frequency corresponding to | |
737 | * the cpufreq table entry indexed by new_index on the cpus in the | |
738 | * mask policy->cpus | |
739 | */ | |
740 | static int powernv_cpufreq_target_index(struct cpufreq_policy *policy, | |
741 | unsigned int new_index) | |
742 | { | |
743 | struct powernv_smp_call_data freq_data; | |
09ca4c9b | 744 | unsigned int cur_msec, gpstate_idx; |
eaa2c3ae | 745 | struct global_pstate_info *gpstates = policy->driver_data; |
b3d627a5 | 746 | |
cf30af76 SB |
747 | if (unlikely(rebooting) && new_index != get_nominal_index()) |
748 | return 0; | |
749 | ||
8a10c06a DK |
750 | if (!throttled) { |
751 | /* we don't want to be preempted while | |
752 | * checking if the CPU frequency has been throttled | |
753 | */ | |
754 | preempt_disable(); | |
735366fc | 755 | powernv_cpufreq_throttle_check(NULL); |
8a10c06a DK |
756 | preempt_enable(); |
757 | } | |
09a972d1 | 758 | |
eaa2c3ae AA |
759 | cur_msec = jiffies_to_msecs(get_jiffies_64()); |
760 | ||
09ca4c9b | 761 | freq_data.pstate_id = idx_to_pstate(new_index); |
dcb14337 SB |
762 | if (!gpstates) { |
763 | freq_data.gpstate_id = freq_data.pstate_id; | |
764 | goto no_gpstate; | |
765 | } | |
766 | ||
767 | spin_lock(&gpstates->gpstate_lock); | |
b3d627a5 | 768 | |
eaa2c3ae | 769 | if (!gpstates->last_sampled_time) { |
09ca4c9b AA |
770 | gpstate_idx = new_index; |
771 | gpstates->highest_lpstate_idx = new_index; | |
eaa2c3ae AA |
772 | goto gpstates_done; |
773 | } | |
774 | ||
09ca4c9b | 775 | if (gpstates->last_gpstate_idx < new_index) { |
eaa2c3ae AA |
776 | gpstates->elapsed_time += cur_msec - |
777 | gpstates->last_sampled_time; | |
778 | ||
779 | /* | |
780 | * If its has been ramping down for more than MAX_RAMP_DOWN_TIME | |
781 | * we should be resetting all global pstate related data. Set it | |
782 | * equal to local pstate to start fresh. | |
783 | */ | |
784 | if (gpstates->elapsed_time > MAX_RAMP_DOWN_TIME) { | |
785 | reset_gpstates(policy); | |
09ca4c9b AA |
786 | gpstates->highest_lpstate_idx = new_index; |
787 | gpstate_idx = new_index; | |
eaa2c3ae AA |
788 | } else { |
789 | /* Elaspsed_time is less than 5 seconds, continue to rampdown */ | |
09ca4c9b AA |
790 | gpstate_idx = calc_global_pstate(gpstates->elapsed_time, |
791 | gpstates->highest_lpstate_idx, | |
792 | new_index); | |
eaa2c3ae AA |
793 | } |
794 | } else { | |
795 | reset_gpstates(policy); | |
09ca4c9b AA |
796 | gpstates->highest_lpstate_idx = new_index; |
797 | gpstate_idx = new_index; | |
eaa2c3ae AA |
798 | } |
799 | ||
800 | /* | |
801 | * If local pstate is equal to global pstate, rampdown is over | |
802 | * So timer is not required to be queued. | |
803 | */ | |
09ca4c9b | 804 | if (gpstate_idx != new_index) |
eaa2c3ae | 805 | queue_gpstate_timer(gpstates); |
0bc10b93 AA |
806 | else |
807 | del_timer_sync(&gpstates->timer); | |
eaa2c3ae AA |
808 | |
809 | gpstates_done: | |
09ca4c9b | 810 | freq_data.gpstate_id = idx_to_pstate(gpstate_idx); |
eaa2c3ae | 811 | gpstates->last_sampled_time = cur_msec; |
09ca4c9b AA |
812 | gpstates->last_gpstate_idx = gpstate_idx; |
813 | gpstates->last_lpstate_idx = new_index; | |
eaa2c3ae | 814 | |
1fd3ff28 AA |
815 | spin_unlock(&gpstates->gpstate_lock); |
816 | ||
dcb14337 | 817 | no_gpstate: |
b3d627a5 VS |
818 | /* |
819 | * Use smp_call_function to send IPI and execute the | |
820 | * mtspr on target CPU. We could do that without IPI | |
821 | * if current CPU is within policy->cpus (core) | |
822 | */ | |
823 | smp_call_function_any(policy->cpus, set_pstate, &freq_data, 1); | |
b3d627a5 VS |
824 | return 0; |
825 | } | |
826 | ||
827 | static int powernv_cpufreq_cpu_init(struct cpufreq_policy *policy) | |
828 | { | |
bf14721c | 829 | int base, i; |
2920e9ce | 830 | struct kernfs_node *kn; |
eaa2c3ae | 831 | struct global_pstate_info *gpstates; |
b3d627a5 VS |
832 | |
833 | base = cpu_first_thread_sibling(policy->cpu); | |
834 | ||
835 | for (i = 0; i < threads_per_core; i++) | |
836 | cpumask_set_cpu(base + i, policy->cpus); | |
837 | ||
2920e9ce SB |
838 | kn = kernfs_find_and_get(policy->kobj.sd, throttle_attr_grp.name); |
839 | if (!kn) { | |
1b028984 SB |
840 | int ret; |
841 | ||
842 | ret = sysfs_create_group(&policy->kobj, &throttle_attr_grp); | |
843 | if (ret) { | |
844 | pr_info("Failed to create throttle stats directory for cpu %d\n", | |
845 | policy->cpu); | |
846 | return ret; | |
847 | } | |
2920e9ce SB |
848 | } else { |
849 | kernfs_put(kn); | |
1b028984 | 850 | } |
eaa2c3ae | 851 | |
dcb14337 SB |
852 | policy->freq_table = powernv_freqs; |
853 | policy->fast_switch_possible = true; | |
854 | ||
855 | if (pvr_version_is(PVR_POWER9)) | |
856 | return 0; | |
857 | ||
858 | /* Initialise Gpstate ramp-down timer only on POWER8 */ | |
eaa2c3ae AA |
859 | gpstates = kzalloc(sizeof(*gpstates), GFP_KERNEL); |
860 | if (!gpstates) | |
861 | return -ENOMEM; | |
862 | ||
863 | policy->driver_data = gpstates; | |
864 | ||
865 | /* initialize timer */ | |
1d1fe902 KC |
866 | gpstates->policy = policy; |
867 | timer_setup(&gpstates->timer, gpstate_timer_handler, | |
868 | TIMER_PINNED | TIMER_DEFERRABLE); | |
eaa2c3ae AA |
869 | gpstates->timer.expires = jiffies + |
870 | msecs_to_jiffies(GPSTATE_TIMER_INTERVAL); | |
871 | spin_lock_init(&gpstates->gpstate_lock); | |
eaa2c3ae | 872 | |
bf14721c | 873 | return 0; |
eaa2c3ae AA |
874 | } |
875 | ||
876 | static int powernv_cpufreq_cpu_exit(struct cpufreq_policy *policy) | |
877 | { | |
878 | /* timer is deleted in cpufreq_cpu_stop() */ | |
879 | kfree(policy->driver_data); | |
880 | ||
881 | return 0; | |
b3d627a5 VS |
882 | } |
883 | ||
cf30af76 SB |
884 | static int powernv_cpufreq_reboot_notifier(struct notifier_block *nb, |
885 | unsigned long action, void *unused) | |
886 | { | |
887 | int cpu; | |
a2d0230b | 888 | struct cpufreq_policy *cpu_policy; |
cf30af76 SB |
889 | |
890 | rebooting = true; | |
891 | for_each_online_cpu(cpu) { | |
a2d0230b SD |
892 | cpu_policy = cpufreq_cpu_get(cpu); |
893 | if (!cpu_policy) | |
894 | continue; | |
895 | powernv_cpufreq_target_index(cpu_policy, get_nominal_index()); | |
896 | cpufreq_cpu_put(cpu_policy); | |
cf30af76 SB |
897 | } |
898 | ||
899 | return NOTIFY_DONE; | |
900 | } | |
901 | ||
902 | static struct notifier_block powernv_cpufreq_reboot_nb = { | |
903 | .notifier_call = powernv_cpufreq_reboot_notifier, | |
904 | }; | |
905 | ||
133c6c84 | 906 | static void powernv_cpufreq_work_fn(struct work_struct *work) |
735366fc SB |
907 | { |
908 | struct chip *chip = container_of(work, struct chip, throttle); | |
d95fe371 | 909 | struct cpufreq_policy *policy; |
22794280 | 910 | unsigned int cpu; |
6d167a44 | 911 | cpumask_t mask; |
735366fc | 912 | |
6d167a44 SB |
913 | get_online_cpus(); |
914 | cpumask_and(&mask, &chip->mask, cpu_online_mask); | |
915 | smp_call_function_any(&mask, | |
735366fc | 916 | powernv_cpufreq_throttle_check, NULL, 0); |
22794280 SB |
917 | |
918 | if (!chip->restore) | |
6d167a44 | 919 | goto out; |
22794280 SB |
920 | |
921 | chip->restore = false; | |
6d167a44 SB |
922 | for_each_cpu(cpu, &mask) { |
923 | int index; | |
22794280 | 924 | |
d95fe371 PRS |
925 | policy = cpufreq_cpu_get(cpu); |
926 | if (!policy) | |
927 | continue; | |
928 | index = cpufreq_table_find_index_c(policy, policy->cur); | |
929 | powernv_cpufreq_target_index(policy, index); | |
930 | cpumask_andnot(&mask, &mask, policy->cpus); | |
931 | cpufreq_cpu_put(policy); | |
22794280 | 932 | } |
6d167a44 SB |
933 | out: |
934 | put_online_cpus(); | |
735366fc SB |
935 | } |
936 | ||
cb166fa9 SB |
937 | static int powernv_cpufreq_occ_msg(struct notifier_block *nb, |
938 | unsigned long msg_type, void *_msg) | |
939 | { | |
940 | struct opal_msg *msg = _msg; | |
941 | struct opal_occ_msg omsg; | |
735366fc | 942 | int i; |
cb166fa9 SB |
943 | |
944 | if (msg_type != OPAL_MSG_OCC) | |
945 | return 0; | |
946 | ||
947 | omsg.type = be64_to_cpu(msg->params[0]); | |
948 | ||
949 | switch (omsg.type) { | |
950 | case OCC_RESET: | |
951 | occ_reset = true; | |
309d0631 | 952 | pr_info("OCC (On Chip Controller - enforces hard thermal/power limits) Resetting\n"); |
cb166fa9 SB |
953 | /* |
954 | * powernv_cpufreq_throttle_check() is called in | |
955 | * target() callback which can detect the throttle state | |
956 | * for governors like ondemand. | |
957 | * But static governors will not call target() often thus | |
958 | * report throttling here. | |
959 | */ | |
960 | if (!throttled) { | |
961 | throttled = true; | |
c89f2682 | 962 | pr_warn("CPU frequency is throttled for duration\n"); |
cb166fa9 | 963 | } |
309d0631 | 964 | |
cb166fa9 SB |
965 | break; |
966 | case OCC_LOAD: | |
309d0631 | 967 | pr_info("OCC Loading, CPU frequency is throttled until OCC is started\n"); |
cb166fa9 SB |
968 | break; |
969 | case OCC_THROTTLE: | |
970 | omsg.chip = be64_to_cpu(msg->params[1]); | |
971 | omsg.throttle_status = be64_to_cpu(msg->params[2]); | |
972 | ||
973 | if (occ_reset) { | |
974 | occ_reset = false; | |
975 | throttled = false; | |
309d0631 | 976 | pr_info("OCC Active, CPU frequency is no longer throttled\n"); |
735366fc | 977 | |
22794280 SB |
978 | for (i = 0; i < nr_chips; i++) { |
979 | chips[i].restore = true; | |
735366fc | 980 | schedule_work(&chips[i].throttle); |
22794280 | 981 | } |
735366fc | 982 | |
cb166fa9 SB |
983 | return 0; |
984 | } | |
985 | ||
c89f2682 SB |
986 | for (i = 0; i < nr_chips; i++) |
987 | if (chips[i].id == omsg.chip) | |
988 | break; | |
989 | ||
990 | if (omsg.throttle_status >= 0 && | |
1b028984 | 991 | omsg.throttle_status <= OCC_MAX_THROTTLE_STATUS) { |
c89f2682 | 992 | chips[i].throttle_reason = omsg.throttle_status; |
1b028984 SB |
993 | chips[i].reason[omsg.throttle_status]++; |
994 | } | |
735366fc | 995 | |
c89f2682 SB |
996 | if (!omsg.throttle_status) |
997 | chips[i].restore = true; | |
998 | ||
999 | schedule_work(&chips[i].throttle); | |
cb166fa9 SB |
1000 | } |
1001 | return 0; | |
1002 | } | |
1003 | ||
1004 | static struct notifier_block powernv_cpufreq_opal_nb = { | |
1005 | .notifier_call = powernv_cpufreq_occ_msg, | |
1006 | .next = NULL, | |
1007 | .priority = 0, | |
1008 | }; | |
1009 | ||
b120339c PM |
1010 | static void powernv_cpufreq_stop_cpu(struct cpufreq_policy *policy) |
1011 | { | |
1012 | struct powernv_smp_call_data freq_data; | |
eaa2c3ae | 1013 | struct global_pstate_info *gpstates = policy->driver_data; |
b120339c | 1014 | |
09ca4c9b AA |
1015 | freq_data.pstate_id = idx_to_pstate(powernv_pstate_info.min); |
1016 | freq_data.gpstate_id = idx_to_pstate(powernv_pstate_info.min); | |
b120339c | 1017 | smp_call_function_single(policy->cpu, set_pstate, &freq_data, 1); |
dcb14337 SB |
1018 | if (gpstates) |
1019 | del_timer_sync(&gpstates->timer); | |
b120339c PM |
1020 | } |
1021 | ||
60c9efb8 AA |
1022 | static unsigned int powernv_fast_switch(struct cpufreq_policy *policy, |
1023 | unsigned int target_freq) | |
1024 | { | |
1025 | int index; | |
1026 | struct powernv_smp_call_data freq_data; | |
1027 | ||
1028 | index = cpufreq_table_find_index_dl(policy, target_freq); | |
1029 | freq_data.pstate_id = powernv_freqs[index].driver_data; | |
1030 | freq_data.gpstate_id = powernv_freqs[index].driver_data; | |
1031 | set_pstate(&freq_data); | |
1032 | ||
1033 | return powernv_freqs[index].frequency; | |
1034 | } | |
1035 | ||
b3d627a5 VS |
1036 | static struct cpufreq_driver powernv_cpufreq_driver = { |
1037 | .name = "powernv-cpufreq", | |
1038 | .flags = CPUFREQ_CONST_LOOPS, | |
1039 | .init = powernv_cpufreq_cpu_init, | |
eaa2c3ae | 1040 | .exit = powernv_cpufreq_cpu_exit, |
b3d627a5 VS |
1041 | .verify = cpufreq_generic_frequency_table_verify, |
1042 | .target_index = powernv_cpufreq_target_index, | |
60c9efb8 | 1043 | .fast_switch = powernv_fast_switch, |
b3d627a5 | 1044 | .get = powernv_cpufreq_get, |
b120339c | 1045 | .stop_cpu = powernv_cpufreq_stop_cpu, |
b3d627a5 VS |
1046 | .attr = powernv_cpu_freq_attr, |
1047 | }; | |
1048 | ||
053819e0 SB |
1049 | static int init_chip_info(void) |
1050 | { | |
db0d32d8 | 1051 | unsigned int *chip; |
053819e0 SB |
1052 | unsigned int cpu, i; |
1053 | unsigned int prev_chip_id = UINT_MAX; | |
db0d32d8 JH |
1054 | int ret = 0; |
1055 | ||
1056 | chip = kcalloc(num_possible_cpus(), sizeof(*chip), GFP_KERNEL); | |
1057 | if (!chip) | |
1058 | return -ENOMEM; | |
96c4726f | 1059 | |
3e5963bc | 1060 | for_each_possible_cpu(cpu) { |
053819e0 SB |
1061 | unsigned int id = cpu_to_chip_id(cpu); |
1062 | ||
1063 | if (prev_chip_id != id) { | |
1064 | prev_chip_id = id; | |
1065 | chip[nr_chips++] = id; | |
1066 | } | |
1067 | } | |
1068 | ||
c89f2682 | 1069 | chips = kcalloc(nr_chips, sizeof(struct chip), GFP_KERNEL); |
db0d32d8 JH |
1070 | if (!chips) { |
1071 | ret = -ENOMEM; | |
1072 | goto free_and_return; | |
1073 | } | |
053819e0 SB |
1074 | |
1075 | for (i = 0; i < nr_chips; i++) { | |
1076 | chips[i].id = chip[i]; | |
735366fc SB |
1077 | cpumask_copy(&chips[i].mask, cpumask_of_node(chip[i])); |
1078 | INIT_WORK(&chips[i].throttle, powernv_cpufreq_work_fn); | |
3e5963bc MN |
1079 | for_each_cpu(cpu, &chips[i].mask) |
1080 | per_cpu(chip_info, cpu) = &chips[i]; | |
053819e0 SB |
1081 | } |
1082 | ||
db0d32d8 JH |
1083 | free_and_return: |
1084 | kfree(chip); | |
1085 | return ret; | |
053819e0 SB |
1086 | } |
1087 | ||
c5e29ea7 SB |
1088 | static inline void clean_chip_info(void) |
1089 | { | |
d0a72efa OH |
1090 | int i; |
1091 | ||
1092 | /* flush any pending work items */ | |
1093 | if (chips) | |
1094 | for (i = 0; i < nr_chips; i++) | |
1095 | cancel_work_sync(&chips[i].throttle); | |
c5e29ea7 | 1096 | kfree(chips); |
c5e29ea7 SB |
1097 | } |
1098 | ||
1099 | static inline void unregister_all_notifiers(void) | |
1100 | { | |
1101 | opal_message_notifier_unregister(OPAL_MSG_OCC, | |
1102 | &powernv_cpufreq_opal_nb); | |
1103 | unregister_reboot_notifier(&powernv_cpufreq_reboot_nb); | |
1104 | } | |
1105 | ||
b3d627a5 VS |
1106 | static int __init powernv_cpufreq_init(void) |
1107 | { | |
1108 | int rc = 0; | |
1109 | ||
6174bac8 | 1110 | /* Don't probe on pseries (guest) platforms */ |
e4d54f71 | 1111 | if (!firmware_has_feature(FW_FEATURE_OPAL)) |
6174bac8 VS |
1112 | return -ENODEV; |
1113 | ||
b3d627a5 VS |
1114 | /* Discover pstates from device tree and init */ |
1115 | rc = init_powernv_pstates(); | |
c5e29ea7 SB |
1116 | if (rc) |
1117 | goto out; | |
b3d627a5 | 1118 | |
053819e0 SB |
1119 | /* Populate chip info */ |
1120 | rc = init_chip_info(); | |
1121 | if (rc) | |
c5e29ea7 | 1122 | goto out; |
053819e0 | 1123 | |
b12f7a2b SB |
1124 | if (powernv_pstate_info.wof_enabled) |
1125 | powernv_cpufreq_driver.boost_enabled = true; | |
1126 | else | |
1127 | powernv_cpu_freq_attr[SCALING_BOOST_FREQS_ATTR_INDEX] = NULL; | |
1128 | ||
c5e29ea7 | 1129 | rc = cpufreq_register_driver(&powernv_cpufreq_driver); |
b12f7a2b SB |
1130 | if (rc) { |
1131 | pr_info("Failed to register the cpufreq driver (%d)\n", rc); | |
966c08de | 1132 | goto cleanup; |
b12f7a2b | 1133 | } |
c5e29ea7 | 1134 | |
b12f7a2b SB |
1135 | if (powernv_pstate_info.wof_enabled) |
1136 | cpufreq_enable_boost_support(); | |
1137 | ||
966c08de OH |
1138 | register_reboot_notifier(&powernv_cpufreq_reboot_nb); |
1139 | opal_message_notifier_register(OPAL_MSG_OCC, &powernv_cpufreq_opal_nb); | |
1140 | ||
b12f7a2b | 1141 | return 0; |
966c08de | 1142 | cleanup: |
c5e29ea7 SB |
1143 | clean_chip_info(); |
1144 | out: | |
1145 | pr_info("Platform driver disabled. System does not support PState control\n"); | |
1146 | return rc; | |
b3d627a5 VS |
1147 | } |
1148 | module_init(powernv_cpufreq_init); | |
1149 | ||
1150 | static void __exit powernv_cpufreq_exit(void) | |
1151 | { | |
1152 | cpufreq_unregister_driver(&powernv_cpufreq_driver); | |
c5e29ea7 SB |
1153 | unregister_all_notifiers(); |
1154 | clean_chip_info(); | |
b3d627a5 VS |
1155 | } |
1156 | module_exit(powernv_cpufreq_exit); | |
1157 | ||
1158 | MODULE_LICENSE("GPL"); | |
1159 | MODULE_AUTHOR("Vaidyanathan Srinivasan <svaidy at linux.vnet.ibm.com>"); |