1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright 2012 by Oracle Inc |
4 | * Author: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> |
5 | * |
6 | * This code borrows ideas from |
7 | * https://lore.kernel.org/lkml/1322673664-14642-6-git-send-email-konrad.wilk@oracle.com |
8 | * so many thanks go to Kevin Tian <kevin.tian@intel.com> |
9 | * and Yu Ke <ke.yu@intel.com>. |
10 | */ |
11 | |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | |
14 | #include <linux/cpumask.h> |
15 | #include <linux/cpufreq.h> |
16 | #include <linux/freezer.h> |
17 | #include <linux/kernel.h> |
18 | #include <linux/kthread.h> |
19 | #include <linux/init.h> |
20 | #include <linux/module.h> |
21 | #include <linux/types.h> |
22 | #include <linux/syscore_ops.h> |
23 | #include <linux/acpi.h> |
24 | #include <acpi/processor.h> |
25 | #include <xen/xen.h> |
26 | #include <xen/interface/platform.h> |
27 | #include <asm/xen/hypercall.h> |
28 | |
29 | static int no_hypercall; |
30 | MODULE_PARM_DESC(off, "Inhibit the hypercall." ); |
31 | module_param_named(off, no_hypercall, int, 0400); |
32 | |
33 | /* |
34 | * Note: Do not convert the acpi_id* below to cpumask_var_t or use cpumask_bit |
35 | * - as those shrink to nr_cpu_bits (which is dependent on possible_cpu), which |
36 | * can be less than what we want to put in. Instead use the 'nr_acpi_bits' |
37 | * which is dynamically computed based on the MADT or x2APIC table. |
38 | */ |
39 | static unsigned int nr_acpi_bits; |
40 | /* Mutex to protect the acpi_ids_done - for CPU hotplug use. */ |
41 | static DEFINE_MUTEX(acpi_ids_mutex); |
42 | /* Which ACPI ID we have processed from 'struct acpi_processor'. */ |
43 | static unsigned long *acpi_ids_done; |
44 | /* Which ACPI ID exist in the SSDT/DSDT processor definitions. */ |
45 | static unsigned long *acpi_id_present; |
46 | /* And if there is an _CST definition (or a PBLK) for the ACPI IDs */ |
47 | static unsigned long *acpi_id_cst_present; |
48 | /* Which ACPI P-State dependencies for a enumerated processor */ |
49 | static struct acpi_psd_package *acpi_psd; |
50 | |
51 | static int push_cxx_to_hypervisor(struct acpi_processor *_pr) |
52 | { |
53 | struct xen_platform_op op = { |
54 | .cmd = XENPF_set_processor_pminfo, |
55 | .interface_version = XENPF_INTERFACE_VERSION, |
56 | .u.set_pminfo.id = _pr->acpi_id, |
57 | .u.set_pminfo.type = XEN_PM_CX, |
58 | }; |
59 | struct xen_processor_cx *dst_cx, *dst_cx_states = NULL; |
60 | struct acpi_processor_cx *cx; |
61 | unsigned int i, ok; |
62 | int ret = 0; |
63 | |
64 | dst_cx_states = kcalloc(n: _pr->power.count, |
65 | size: sizeof(struct xen_processor_cx), GFP_KERNEL); |
66 | if (!dst_cx_states) |
67 | return -ENOMEM; |
68 | |
69 | for (ok = 0, i = 1; i <= _pr->power.count; i++) { |
70 | cx = &_pr->power.states[i]; |
71 | if (!cx->valid) |
72 | continue; |
73 | |
74 | dst_cx = &(dst_cx_states[ok++]); |
75 | |
76 | dst_cx->reg.space_id = ACPI_ADR_SPACE_SYSTEM_IO; |
77 | if (cx->entry_method == ACPI_CSTATE_SYSTEMIO) { |
78 | dst_cx->reg.bit_width = 8; |
79 | dst_cx->reg.bit_offset = 0; |
80 | dst_cx->reg.access_size = 1; |
81 | } else { |
82 | dst_cx->reg.space_id = ACPI_ADR_SPACE_FIXED_HARDWARE; |
83 | if (cx->entry_method == ACPI_CSTATE_FFH) { |
84 | /* NATIVE_CSTATE_BEYOND_HALT */ |
85 | dst_cx->reg.bit_offset = 2; |
86 | dst_cx->reg.bit_width = 1; /* VENDOR_INTEL */ |
87 | } |
88 | dst_cx->reg.access_size = 0; |
89 | } |
90 | dst_cx->reg.address = cx->address; |
91 | |
92 | dst_cx->type = cx->type; |
93 | dst_cx->latency = cx->latency; |
94 | |
95 | dst_cx->dpcnt = 0; |
96 | set_xen_guest_handle(dst_cx->dp, NULL); |
97 | } |
98 | if (!ok) { |
99 | pr_debug("No _Cx for ACPI CPU %u\n" , _pr->acpi_id); |
100 | kfree(objp: dst_cx_states); |
101 | return -EINVAL; |
102 | } |
103 | op.u.set_pminfo.power.count = ok; |
104 | op.u.set_pminfo.power.flags.bm_control = _pr->flags.bm_control; |
105 | op.u.set_pminfo.power.flags.bm_check = _pr->flags.bm_check; |
106 | op.u.set_pminfo.power.flags.has_cst = _pr->flags.has_cst; |
107 | op.u.set_pminfo.power.flags.power_setup_done = |
108 | _pr->flags.power_setup_done; |
109 | |
110 | set_xen_guest_handle(op.u.set_pminfo.power.states, dst_cx_states); |
111 | |
112 | if (!no_hypercall) |
113 | ret = HYPERVISOR_platform_op(op: &op); |
114 | |
115 | if (!ret) { |
116 | pr_debug("ACPI CPU%u - C-states uploaded.\n" , _pr->acpi_id); |
117 | for (i = 1; i <= _pr->power.count; i++) { |
118 | cx = &_pr->power.states[i]; |
119 | if (!cx->valid) |
120 | continue; |
121 | pr_debug(" C%d: %s %d uS\n" , |
122 | cx->type, cx->desc, (u32)cx->latency); |
123 | } |
124 | } else if ((ret != -EINVAL) && (ret != -ENOSYS)) |
125 | /* EINVAL means the ACPI ID is incorrect - meaning the ACPI |
126 | * table is referencing a non-existing CPU - which can happen |
127 | * with broken ACPI tables. */ |
128 | pr_err("(CX): Hypervisor error (%d) for ACPI CPU%u\n" , |
129 | ret, _pr->acpi_id); |
130 | |
131 | kfree(objp: dst_cx_states); |
132 | |
133 | return ret; |
134 | } |
135 | static struct xen_processor_px * |
136 | xen_copy_pss_data(struct acpi_processor *_pr, |
137 | struct xen_processor_performance *dst_perf) |
138 | { |
139 | struct xen_processor_px *dst_states = NULL; |
140 | unsigned int i; |
141 | |
142 | BUILD_BUG_ON(sizeof(struct xen_processor_px) != |
143 | sizeof(struct acpi_processor_px)); |
144 | |
145 | dst_states = kcalloc(n: _pr->performance->state_count, |
146 | size: sizeof(struct xen_processor_px), GFP_KERNEL); |
147 | if (!dst_states) |
148 | return ERR_PTR(error: -ENOMEM); |
149 | |
150 | dst_perf->state_count = _pr->performance->state_count; |
151 | for (i = 0; i < _pr->performance->state_count; i++) { |
152 | /* Fortunatly for us, they are both the same size */ |
153 | memcpy(&(dst_states[i]), &(_pr->performance->states[i]), |
154 | sizeof(struct acpi_processor_px)); |
155 | } |
156 | return dst_states; |
157 | } |
158 | static int xen_copy_psd_data(struct acpi_processor *_pr, |
159 | struct xen_processor_performance *dst) |
160 | { |
161 | struct acpi_psd_package *pdomain; |
162 | |
163 | BUILD_BUG_ON(sizeof(struct xen_psd_package) != |
164 | sizeof(struct acpi_psd_package)); |
165 | |
166 | /* This information is enumerated only if acpi_processor_preregister_performance |
167 | * has been called. |
168 | */ |
169 | dst->shared_type = _pr->performance->shared_type; |
170 | |
171 | pdomain = &(_pr->performance->domain_info); |
172 | |
173 | /* 'acpi_processor_preregister_performance' does not parse if the |
174 | * num_processors <= 1, but Xen still requires it. Do it manually here. |
175 | */ |
176 | if (pdomain->num_processors <= 1) { |
177 | if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) |
178 | dst->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
179 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) |
180 | dst->shared_type = CPUFREQ_SHARED_TYPE_HW; |
181 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) |
182 | dst->shared_type = CPUFREQ_SHARED_TYPE_ANY; |
183 | |
184 | } |
185 | memcpy(&(dst->domain_info), pdomain, sizeof(struct acpi_psd_package)); |
186 | return 0; |
187 | } |
188 | static int xen_copy_pct_data(struct acpi_pct_register *pct, |
189 | struct xen_pct_register *dst_pct) |
190 | { |
191 | /* It would be nice if you could just do 'memcpy(pct, dst_pct') but |
192 | * sadly the Xen structure did not have the proper padding so the |
193 | * descriptor field takes two (dst_pct) bytes instead of one (pct). |
194 | */ |
195 | dst_pct->descriptor = pct->descriptor; |
196 | dst_pct->length = pct->length; |
197 | dst_pct->space_id = pct->space_id; |
198 | dst_pct->bit_width = pct->bit_width; |
199 | dst_pct->bit_offset = pct->bit_offset; |
200 | dst_pct->reserved = pct->reserved; |
201 | dst_pct->address = pct->address; |
202 | return 0; |
203 | } |
204 | static int push_pxx_to_hypervisor(struct acpi_processor *_pr) |
205 | { |
206 | int ret = 0; |
207 | struct xen_platform_op op = { |
208 | .cmd = XENPF_set_processor_pminfo, |
209 | .interface_version = XENPF_INTERFACE_VERSION, |
210 | .u.set_pminfo.id = _pr->acpi_id, |
211 | .u.set_pminfo.type = XEN_PM_PX, |
212 | }; |
213 | struct xen_processor_performance *dst_perf; |
214 | struct xen_processor_px *dst_states = NULL; |
215 | |
216 | dst_perf = &op.u.set_pminfo.perf; |
217 | |
218 | dst_perf->platform_limit = _pr->performance_platform_limit; |
219 | dst_perf->flags |= XEN_PX_PPC; |
220 | xen_copy_pct_data(pct: &(_pr->performance->control_register), |
221 | dst_pct: &dst_perf->control_register); |
222 | xen_copy_pct_data(pct: &(_pr->performance->status_register), |
223 | dst_pct: &dst_perf->status_register); |
224 | dst_perf->flags |= XEN_PX_PCT; |
225 | dst_states = xen_copy_pss_data(_pr, dst_perf); |
226 | if (!IS_ERR_OR_NULL(ptr: dst_states)) { |
227 | set_xen_guest_handle(dst_perf->states, dst_states); |
228 | dst_perf->flags |= XEN_PX_PSS; |
229 | } |
230 | if (!xen_copy_psd_data(_pr, dst: dst_perf)) |
231 | dst_perf->flags |= XEN_PX_PSD; |
232 | |
233 | if (dst_perf->flags != (XEN_PX_PSD | XEN_PX_PSS | XEN_PX_PCT | XEN_PX_PPC)) { |
234 | pr_warn("ACPI CPU%u missing some P-state data (%x), skipping\n" , |
235 | _pr->acpi_id, dst_perf->flags); |
236 | ret = -ENODEV; |
237 | goto err_free; |
238 | } |
239 | |
240 | if (!no_hypercall) |
241 | ret = HYPERVISOR_platform_op(op: &op); |
242 | |
243 | if (!ret) { |
244 | struct acpi_processor_performance *perf; |
245 | unsigned int i; |
246 | |
247 | perf = _pr->performance; |
248 | pr_debug("ACPI CPU%u - P-states uploaded.\n" , _pr->acpi_id); |
249 | for (i = 0; i < perf->state_count; i++) { |
250 | pr_debug(" %cP%d: %d MHz, %d mW, %d uS\n" , |
251 | (i == perf->state ? '*' : ' '), i, |
252 | (u32) perf->states[i].core_frequency, |
253 | (u32) perf->states[i].power, |
254 | (u32) perf->states[i].transition_latency); |
255 | } |
256 | } else if ((ret != -EINVAL) && (ret != -ENOSYS)) |
257 | /* EINVAL means the ACPI ID is incorrect - meaning the ACPI |
258 | * table is referencing a non-existing CPU - which can happen |
259 | * with broken ACPI tables. */ |
260 | pr_warn("(_PXX): Hypervisor error (%d) for ACPI CPU%u\n" , |
261 | ret, _pr->acpi_id); |
262 | err_free: |
263 | if (!IS_ERR_OR_NULL(ptr: dst_states)) |
264 | kfree(objp: dst_states); |
265 | |
266 | return ret; |
267 | } |
268 | static int upload_pm_data(struct acpi_processor *_pr) |
269 | { |
270 | int err = 0; |
271 | |
272 | mutex_lock(&acpi_ids_mutex); |
273 | if (__test_and_set_bit(_pr->acpi_id, acpi_ids_done)) { |
274 | mutex_unlock(lock: &acpi_ids_mutex); |
275 | return -EBUSY; |
276 | } |
277 | if (_pr->flags.power) |
278 | err = push_cxx_to_hypervisor(_pr); |
279 | |
280 | if (_pr->performance && _pr->performance->states) |
281 | err |= push_pxx_to_hypervisor(_pr); |
282 | |
283 | mutex_unlock(lock: &acpi_ids_mutex); |
284 | return err; |
285 | } |
286 | static unsigned int __init get_max_acpi_id(void) |
287 | { |
288 | struct xenpf_pcpuinfo *info; |
289 | struct xen_platform_op op = { |
290 | .cmd = XENPF_get_cpuinfo, |
291 | .interface_version = XENPF_INTERFACE_VERSION, |
292 | }; |
293 | int ret = 0; |
294 | unsigned int i, last_cpu, max_acpi_id = 0; |
295 | |
296 | info = &op.u.pcpu_info; |
297 | info->xen_cpuid = 0; |
298 | |
299 | ret = HYPERVISOR_platform_op(op: &op); |
300 | if (ret) |
301 | return NR_CPUS; |
302 | |
303 | /* The max_present is the same irregardless of the xen_cpuid */ |
304 | last_cpu = op.u.pcpu_info.max_present; |
305 | for (i = 0; i <= last_cpu; i++) { |
306 | info->xen_cpuid = i; |
307 | ret = HYPERVISOR_platform_op(op: &op); |
308 | if (ret) |
309 | continue; |
310 | max_acpi_id = max(info->acpi_id, max_acpi_id); |
311 | } |
312 | max_acpi_id *= 2; /* Slack for CPU hotplug support. */ |
313 | pr_debug("Max ACPI ID: %u\n" , max_acpi_id); |
314 | return max_acpi_id; |
315 | } |
316 | /* |
317 | * The read_acpi_id and check_acpi_ids are there to support the Xen |
318 | * oddity of virtual CPUs != physical CPUs in the initial domain. |
319 | * The user can supply 'xen_max_vcpus=X' on the Xen hypervisor line |
320 | * which will band the amount of CPUs the initial domain can see. |
321 | * In general that is OK, except it plays havoc with any of the |
322 | * for_each_[present|online]_cpu macros which are banded to the virtual |
323 | * CPU amount. |
324 | */ |
325 | static acpi_status |
326 | read_acpi_id(acpi_handle handle, u32 lvl, void *context, void **rv) |
327 | { |
328 | u32 acpi_id; |
329 | acpi_status status; |
330 | acpi_object_type acpi_type; |
331 | unsigned long long tmp; |
332 | union acpi_object object = { 0 }; |
333 | struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; |
334 | acpi_io_address pblk = 0; |
335 | |
336 | status = acpi_get_type(object: handle, out_type: &acpi_type); |
337 | if (ACPI_FAILURE(status)) |
338 | return AE_OK; |
339 | |
340 | switch (acpi_type) { |
341 | case ACPI_TYPE_PROCESSOR: |
342 | status = acpi_evaluate_object(object: handle, NULL, NULL, return_object_buffer: &buffer); |
343 | if (ACPI_FAILURE(status)) |
344 | return AE_OK; |
345 | acpi_id = object.processor.proc_id; |
346 | pblk = object.processor.pblk_address; |
347 | break; |
348 | case ACPI_TYPE_DEVICE: |
349 | status = acpi_evaluate_integer(handle, pathname: "_UID" , NULL, data: &tmp); |
350 | if (ACPI_FAILURE(status)) |
351 | return AE_OK; |
352 | acpi_id = tmp; |
353 | break; |
354 | default: |
355 | return AE_OK; |
356 | } |
357 | if (invalid_phys_cpuid(phys_id: acpi_get_phys_id(handle, |
358 | type: acpi_type == ACPI_TYPE_DEVICE, |
359 | acpi_id))) { |
360 | pr_debug("CPU with ACPI ID %u is unavailable\n" , acpi_id); |
361 | return AE_OK; |
362 | } |
363 | /* There are more ACPI Processor objects than in x2APIC or MADT. |
364 | * This can happen with incorrect ACPI SSDT declerations. */ |
365 | if (acpi_id >= nr_acpi_bits) { |
366 | pr_debug("max acpi id %u, trying to set %u\n" , |
367 | nr_acpi_bits - 1, acpi_id); |
368 | return AE_OK; |
369 | } |
370 | /* OK, There is a ACPI Processor object */ |
371 | __set_bit(acpi_id, acpi_id_present); |
372 | |
373 | pr_debug("ACPI CPU%u w/ PBLK:0x%lx\n" , acpi_id, (unsigned long)pblk); |
374 | |
375 | /* It has P-state dependencies */ |
376 | if (!acpi_processor_get_psd(handle, pdomain: &acpi_psd[acpi_id])) { |
377 | pr_debug("ACPI CPU%u w/ PST:coord_type = %llu domain = %llu\n" , |
378 | acpi_id, acpi_psd[acpi_id].coord_type, |
379 | acpi_psd[acpi_id].domain); |
380 | } |
381 | |
382 | status = acpi_evaluate_object(object: handle, pathname: "_CST" , NULL, return_object_buffer: &buffer); |
383 | if (ACPI_FAILURE(status)) { |
384 | if (!pblk) |
385 | return AE_OK; |
386 | } |
387 | /* .. and it has a C-state */ |
388 | __set_bit(acpi_id, acpi_id_cst_present); |
389 | |
390 | return AE_OK; |
391 | } |
392 | static int check_acpi_ids(struct acpi_processor *pr_backup) |
393 | { |
394 | |
395 | if (!pr_backup) |
396 | return -ENODEV; |
397 | |
398 | if (acpi_id_present && acpi_id_cst_present) |
399 | /* OK, done this once .. skip to uploading */ |
400 | goto upload; |
401 | |
402 | /* All online CPUs have been processed at this stage. Now verify |
403 | * whether in fact "online CPUs" == physical CPUs. |
404 | */ |
405 | acpi_id_present = bitmap_zalloc(nbits: nr_acpi_bits, GFP_KERNEL); |
406 | if (!acpi_id_present) |
407 | return -ENOMEM; |
408 | |
409 | acpi_id_cst_present = bitmap_zalloc(nbits: nr_acpi_bits, GFP_KERNEL); |
410 | if (!acpi_id_cst_present) { |
411 | bitmap_free(bitmap: acpi_id_present); |
412 | return -ENOMEM; |
413 | } |
414 | |
415 | acpi_psd = kcalloc(n: nr_acpi_bits, size: sizeof(struct acpi_psd_package), |
416 | GFP_KERNEL); |
417 | if (!acpi_psd) { |
418 | bitmap_free(bitmap: acpi_id_present); |
419 | bitmap_free(bitmap: acpi_id_cst_present); |
420 | return -ENOMEM; |
421 | } |
422 | |
423 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, |
424 | ACPI_UINT32_MAX, |
425 | descending_callback: read_acpi_id, NULL, NULL, NULL); |
426 | acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, user_function: read_acpi_id, NULL, NULL); |
427 | |
428 | upload: |
429 | if (!bitmap_equal(src1: acpi_id_present, src2: acpi_ids_done, nbits: nr_acpi_bits)) { |
430 | unsigned int i; |
431 | for_each_set_bit(i, acpi_id_present, nr_acpi_bits) { |
432 | pr_backup->acpi_id = i; |
433 | /* Mask out C-states if there are no _CST or PBLK */ |
434 | pr_backup->flags.power = test_bit(i, acpi_id_cst_present); |
435 | /* num_entries is non-zero if we evaluated _PSD */ |
436 | if (acpi_psd[i].num_entries) { |
437 | memcpy(&pr_backup->performance->domain_info, |
438 | &acpi_psd[i], |
439 | sizeof(struct acpi_psd_package)); |
440 | } |
441 | (void)upload_pm_data(pr: pr_backup); |
442 | } |
443 | } |
444 | |
445 | return 0; |
446 | } |
447 | |
448 | /* acpi_perf_data is a pointer to percpu data. */ |
449 | static struct acpi_processor_performance __percpu *acpi_perf_data; |
450 | |
451 | static void free_acpi_perf_data(void) |
452 | { |
453 | int i; |
454 | |
455 | /* Freeing a NULL pointer is OK, and alloc_percpu zeroes. */ |
456 | for_each_possible_cpu(i) |
457 | free_cpumask_var(per_cpu_ptr(acpi_perf_data, i) |
458 | ->shared_cpu_map); |
459 | free_percpu(pdata: acpi_perf_data); |
460 | } |
461 | |
462 | static int xen_upload_processor_pm_data(void) |
463 | { |
464 | struct acpi_processor *pr_backup = NULL; |
465 | int i; |
466 | int rc = 0; |
467 | |
468 | pr_info("Uploading Xen processor PM info\n" ); |
469 | |
470 | for_each_possible_cpu(i) { |
471 | struct acpi_processor *_pr; |
472 | _pr = per_cpu(processors, i /* APIC ID */); |
473 | if (!_pr) |
474 | continue; |
475 | |
476 | if (!pr_backup) |
477 | pr_backup = kmemdup(p: _pr, size: sizeof(*_pr), GFP_KERNEL); |
478 | (void)upload_pm_data(_pr); |
479 | } |
480 | |
481 | rc = check_acpi_ids(pr_backup); |
482 | kfree(objp: pr_backup); |
483 | |
484 | return rc; |
485 | } |
486 | |
487 | static void xen_acpi_processor_resume_worker(struct work_struct *dummy) |
488 | { |
489 | int rc; |
490 | |
491 | bitmap_zero(dst: acpi_ids_done, nbits: nr_acpi_bits); |
492 | |
493 | rc = xen_upload_processor_pm_data(); |
494 | if (rc != 0) |
495 | pr_info("ACPI data upload failed, error = %d\n" , rc); |
496 | } |
497 | |
498 | static void xen_acpi_processor_resume(void) |
499 | { |
500 | static DECLARE_WORK(wq, xen_acpi_processor_resume_worker); |
501 | |
502 | /* |
503 | * xen_upload_processor_pm_data() calls non-atomic code. |
504 | * However, the context for xen_acpi_processor_resume is syscore |
505 | * with only the boot CPU online and in an atomic context. |
506 | * |
507 | * So defer the upload for some point safer. |
508 | */ |
509 | schedule_work(work: &wq); |
510 | } |
511 | |
512 | static struct syscore_ops xap_syscore_ops = { |
513 | .resume = xen_acpi_processor_resume, |
514 | }; |
515 | |
516 | static int __init xen_acpi_processor_init(void) |
517 | { |
518 | int i; |
519 | int rc; |
520 | |
521 | if (!xen_initial_domain()) |
522 | return -ENODEV; |
523 | |
524 | nr_acpi_bits = get_max_acpi_id() + 1; |
525 | acpi_ids_done = bitmap_zalloc(nbits: nr_acpi_bits, GFP_KERNEL); |
526 | if (!acpi_ids_done) |
527 | return -ENOMEM; |
528 | |
529 | acpi_perf_data = alloc_percpu(struct acpi_processor_performance); |
530 | if (!acpi_perf_data) { |
531 | pr_debug("Memory allocation error for acpi_perf_data\n" ); |
532 | bitmap_free(bitmap: acpi_ids_done); |
533 | return -ENOMEM; |
534 | } |
535 | for_each_possible_cpu(i) { |
536 | if (!zalloc_cpumask_var_node( |
537 | mask: &per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map, |
538 | GFP_KERNEL, cpu_to_node(cpu: i))) { |
539 | rc = -ENOMEM; |
540 | goto err_out; |
541 | } |
542 | } |
543 | |
544 | /* Do initialization in ACPI core. It is OK to fail here. */ |
545 | (void)acpi_processor_preregister_performance(performance: acpi_perf_data); |
546 | |
547 | for_each_possible_cpu(i) { |
548 | struct acpi_processor *pr; |
549 | struct acpi_processor_performance *perf; |
550 | |
551 | pr = per_cpu(processors, i); |
552 | perf = per_cpu_ptr(acpi_perf_data, i); |
553 | if (!pr) |
554 | continue; |
555 | |
556 | pr->performance = perf; |
557 | rc = acpi_processor_get_performance_info(pr); |
558 | if (rc) |
559 | goto err_out; |
560 | } |
561 | |
562 | rc = xen_upload_processor_pm_data(); |
563 | if (rc) |
564 | goto err_unregister; |
565 | |
566 | register_syscore_ops(ops: &xap_syscore_ops); |
567 | |
568 | return 0; |
569 | err_unregister: |
570 | for_each_possible_cpu(i) |
571 | acpi_processor_unregister_performance(cpu: i); |
572 | |
573 | err_out: |
574 | /* Freeing a NULL pointer is OK: alloc_percpu zeroes. */ |
575 | free_acpi_perf_data(); |
576 | bitmap_free(bitmap: acpi_ids_done); |
577 | return rc; |
578 | } |
579 | static void __exit xen_acpi_processor_exit(void) |
580 | { |
581 | int i; |
582 | |
583 | unregister_syscore_ops(ops: &xap_syscore_ops); |
584 | bitmap_free(bitmap: acpi_ids_done); |
585 | bitmap_free(bitmap: acpi_id_present); |
586 | bitmap_free(bitmap: acpi_id_cst_present); |
587 | kfree(objp: acpi_psd); |
588 | for_each_possible_cpu(i) |
589 | acpi_processor_unregister_performance(cpu: i); |
590 | |
591 | free_acpi_perf_data(); |
592 | } |
593 | |
594 | MODULE_AUTHOR("Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>" ); |
595 | MODULE_DESCRIPTION("Xen ACPI Processor P-states (and Cx) driver which uploads PM data to Xen hypervisor" ); |
596 | MODULE_LICENSE("GPL" ); |
597 | |
598 | /* We want to be loaded before the CPU freq scaling drivers are loaded. |
599 | * They are loaded in late_initcall. */ |
600 | device_initcall(xen_acpi_processor_init); |
601 | module_exit(xen_acpi_processor_exit); |
602 | |