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2025cf9e | 1 | // SPDX-License-Identifier: GPL-2.0-only |
59a56802 KRW |
2 | /* |
3 | * Copyright 2012 by Oracle Inc | |
4 | * Author: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | |
5 | * | |
43135df0 KC |
6 | * This code borrows ideas from |
7 | * https://lore.kernel.org/lkml/1322673664-14642-6-git-send-email-konrad.wilk@oracle.com | |
59a56802 KRW |
8 | * so many thanks go to Kevin Tian <kevin.tian@intel.com> |
9 | * and Yu Ke <ke.yu@intel.com>. | |
59a56802 KRW |
10 | */ |
11 | ||
283c0972 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
59a56802 KRW |
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> | |
1914f0cd | 22 | #include <linux/syscore_ops.h> |
8b48463f | 23 | #include <linux/acpi.h> |
59a56802 | 24 | #include <acpi/processor.h> |
323f90a6 | 25 | #include <xen/xen.h> |
59a56802 KRW |
26 | #include <xen/interface/platform.h> |
27 | #include <asm/xen/hypercall.h> | |
28 | ||
59a56802 KRW |
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. */ | |
3fac1014 | 45 | static unsigned long *acpi_id_present; |
59a56802 | 46 | /* And if there is an _CST definition (or a PBLK) for the ACPI IDs */ |
3fac1014 | 47 | static unsigned long *acpi_id_cst_present; |
4d0f1ce6 JM |
48 | /* Which ACPI P-State dependencies for a enumerated processor */ |
49 | static struct acpi_psd_package *acpi_psd; | |
59a56802 KRW |
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(_pr->power.count, | |
65 | 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; | |
59a56802 KRW |
94 | |
95 | dst_cx->dpcnt = 0; | |
96 | set_xen_guest_handle(dst_cx->dp, NULL); | |
97 | } | |
98 | if (!ok) { | |
283c0972 | 99 | pr_debug("No _Cx for ACPI CPU %u\n", _pr->acpi_id); |
59a56802 KRW |
100 | kfree(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) | |
cfafae94 | 113 | ret = HYPERVISOR_platform_op(&op); |
59a56802 KRW |
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 | } | |
1a4b50f6 | 124 | } else if ((ret != -EINVAL) && (ret != -ENOSYS)) |
b930fe5e KRW |
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. */ | |
283c0972 | 128 | pr_err("(CX): Hypervisor error (%d) for ACPI CPU%u\n", |
59a56802 KRW |
129 | ret, _pr->acpi_id); |
130 | ||
131 | kfree(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(_pr->performance->state_count, | |
146 | sizeof(struct xen_processor_px), GFP_KERNEL); | |
147 | if (!dst_states) | |
148 | return ERR_PTR(-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(&(_pr->performance->control_register), | |
221 | &dst_perf->control_register); | |
222 | xen_copy_pct_data(&(_pr->performance->status_register), | |
223 | &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(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_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)) { | |
283c0972 | 234 | pr_warn("ACPI CPU%u missing some P-state data (%x), skipping\n", |
59a56802 KRW |
235 | _pr->acpi_id, dst_perf->flags); |
236 | ret = -ENODEV; | |
237 | goto err_free; | |
238 | } | |
239 | ||
240 | if (!no_hypercall) | |
cfafae94 | 241 | ret = HYPERVISOR_platform_op(&op); |
59a56802 KRW |
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 | } | |
1a4b50f6 | 256 | } else if ((ret != -EINVAL) && (ret != -ENOSYS)) |
59a56802 KRW |
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. */ | |
283c0972 JP |
260 | pr_warn("(_PXX): Hypervisor error (%d) for ACPI CPU%u\n", |
261 | ret, _pr->acpi_id); | |
59a56802 KRW |
262 | err_free: |
263 | if (!IS_ERR_OR_NULL(dst_states)) | |
264 | kfree(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(&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(&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 | ||
cfafae94 | 299 | ret = HYPERVISOR_platform_op(&op); |
59a56802 KRW |
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; | |
cfafae94 | 307 | ret = HYPERVISOR_platform_op(&op); |
59a56802 KRW |
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. */ | |
283c0972 | 313 | pr_debug("Max ACPI ID: %u\n", max_acpi_id); |
59a56802 KRW |
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 | */ | |
18c0025b | 325 | static acpi_status |
59a56802 KRW |
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(handle, &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(handle, NULL, NULL, &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, "_UID", NULL, &tmp); | |
350 | if (ACPI_FAILURE(status)) | |
351 | return AE_OK; | |
352 | acpi_id = tmp; | |
353 | break; | |
354 | default: | |
355 | return AE_OK; | |
356 | } | |
166deb0f JB |
357 | if (invalid_phys_cpuid(acpi_get_phys_id(handle, |
358 | 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 | } | |
59a56802 KRW |
363 | /* There are more ACPI Processor objects than in x2APIC or MADT. |
364 | * This can happen with incorrect ACPI SSDT declerations. */ | |
c37a3c94 DC |
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); | |
59a56802 KRW |
368 | return AE_OK; |
369 | } | |
370 | /* OK, There is a ACPI Processor object */ | |
371 | __set_bit(acpi_id, acpi_id_present); | |
372 | ||
283c0972 | 373 | pr_debug("ACPI CPU%u w/ PBLK:0x%lx\n", acpi_id, (unsigned long)pblk); |
59a56802 | 374 | |
4d0f1ce6 JM |
375 | /* It has P-state dependencies */ |
376 | if (!acpi_processor_get_psd(handle, &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 | ||
59a56802 KRW |
382 | status = acpi_evaluate_object(handle, "_CST", NULL, &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 | } | |
18c0025b | 392 | static int check_acpi_ids(struct acpi_processor *pr_backup) |
59a56802 KRW |
393 | { |
394 | ||
395 | if (!pr_backup) | |
396 | return -ENODEV; | |
397 | ||
3fac1014 BG |
398 | if (acpi_id_present && acpi_id_cst_present) |
399 | /* OK, done this once .. skip to uploading */ | |
400 | goto upload; | |
401 | ||
59a56802 KRW |
402 | /* All online CPUs have been processed at this stage. Now verify |
403 | * whether in fact "online CPUs" == physical CPUs. | |
404 | */ | |
85eb278c | 405 | acpi_id_present = bitmap_zalloc(nr_acpi_bits, GFP_KERNEL); |
59a56802 KRW |
406 | if (!acpi_id_present) |
407 | return -ENOMEM; | |
408 | ||
85eb278c | 409 | acpi_id_cst_present = bitmap_zalloc(nr_acpi_bits, GFP_KERNEL); |
59a56802 | 410 | if (!acpi_id_cst_present) { |
85eb278c | 411 | bitmap_free(acpi_id_present); |
59a56802 KRW |
412 | return -ENOMEM; |
413 | } | |
414 | ||
4d0f1ce6 JM |
415 | acpi_psd = kcalloc(nr_acpi_bits, sizeof(struct acpi_psd_package), |
416 | GFP_KERNEL); | |
417 | if (!acpi_psd) { | |
85eb278c AS |
418 | bitmap_free(acpi_id_present); |
419 | bitmap_free(acpi_id_cst_present); | |
4d0f1ce6 JM |
420 | return -ENOMEM; |
421 | } | |
422 | ||
59a56802 KRW |
423 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, |
424 | ACPI_UINT32_MAX, | |
425 | read_acpi_id, NULL, NULL, NULL); | |
1c2593cc | 426 | acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, read_acpi_id, NULL, NULL); |
59a56802 | 427 | |
3fac1014 | 428 | upload: |
59a56802 KRW |
429 | if (!bitmap_equal(acpi_id_present, acpi_ids_done, 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); | |
4d0f1ce6 JM |
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 | } | |
59a56802 KRW |
441 | (void)upload_pm_data(pr_backup); |
442 | } | |
443 | } | |
3fac1014 | 444 | |
59a56802 KRW |
445 | return 0; |
446 | } | |
59a56802 | 447 | |
59a56802 KRW |
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 | { | |
cbd5458e | 453 | int i; |
59a56802 KRW |
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(acpi_perf_data); | |
460 | } | |
461 | ||
3fac1014 | 462 | static int xen_upload_processor_pm_data(void) |
59a56802 KRW |
463 | { |
464 | struct acpi_processor *pr_backup = NULL; | |
cbd5458e | 465 | int i; |
3fac1014 BG |
466 | int rc = 0; |
467 | ||
283c0972 | 468 | pr_info("Uploading Xen processor PM info\n"); |
3fac1014 BG |
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 = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); | |
478 | if (pr_backup) | |
479 | memcpy(pr_backup, _pr, sizeof(struct acpi_processor)); | |
480 | } | |
481 | (void)upload_pm_data(_pr); | |
482 | } | |
483 | ||
484 | rc = check_acpi_ids(pr_backup); | |
485 | kfree(pr_backup); | |
486 | ||
487 | return rc; | |
488 | } | |
489 | ||
1914f0cd | 490 | static void xen_acpi_processor_resume_worker(struct work_struct *dummy) |
3fac1014 | 491 | { |
1914f0cd AA |
492 | int rc; |
493 | ||
3fac1014 | 494 | bitmap_zero(acpi_ids_done, nr_acpi_bits); |
1914f0cd AA |
495 | |
496 | rc = xen_upload_processor_pm_data(); | |
497 | if (rc != 0) | |
498 | pr_info("ACPI data upload failed, error = %d\n", rc); | |
499 | } | |
500 | ||
501 | static void xen_acpi_processor_resume(void) | |
502 | { | |
503 | static DECLARE_WORK(wq, xen_acpi_processor_resume_worker); | |
504 | ||
505 | /* | |
506 | * xen_upload_processor_pm_data() calls non-atomic code. | |
507 | * However, the context for xen_acpi_processor_resume is syscore | |
508 | * with only the boot CPU online and in an atomic context. | |
509 | * | |
510 | * So defer the upload for some point safer. | |
511 | */ | |
512 | schedule_work(&wq); | |
3fac1014 BG |
513 | } |
514 | ||
1914f0cd AA |
515 | static struct syscore_ops xap_syscore_ops = { |
516 | .resume = xen_acpi_processor_resume, | |
3fac1014 BG |
517 | }; |
518 | ||
519 | static int __init xen_acpi_processor_init(void) | |
520 | { | |
cbd5458e | 521 | int i; |
6f2d9d99 | 522 | int rc; |
59a56802 | 523 | |
6f2d9d99 JB |
524 | if (!xen_initial_domain()) |
525 | return -ENODEV; | |
59a56802 KRW |
526 | |
527 | nr_acpi_bits = get_max_acpi_id() + 1; | |
85eb278c | 528 | acpi_ids_done = bitmap_zalloc(nr_acpi_bits, GFP_KERNEL); |
59a56802 KRW |
529 | if (!acpi_ids_done) |
530 | return -ENOMEM; | |
531 | ||
532 | acpi_perf_data = alloc_percpu(struct acpi_processor_performance); | |
533 | if (!acpi_perf_data) { | |
283c0972 | 534 | pr_debug("Memory allocation error for acpi_perf_data\n"); |
85eb278c | 535 | bitmap_free(acpi_ids_done); |
59a56802 KRW |
536 | return -ENOMEM; |
537 | } | |
538 | for_each_possible_cpu(i) { | |
539 | if (!zalloc_cpumask_var_node( | |
540 | &per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map, | |
541 | GFP_KERNEL, cpu_to_node(i))) { | |
542 | rc = -ENOMEM; | |
543 | goto err_out; | |
544 | } | |
545 | } | |
546 | ||
547 | /* Do initialization in ACPI core. It is OK to fail here. */ | |
548 | (void)acpi_processor_preregister_performance(acpi_perf_data); | |
549 | ||
550 | for_each_possible_cpu(i) { | |
c705c78c | 551 | struct acpi_processor *pr; |
59a56802 KRW |
552 | struct acpi_processor_performance *perf; |
553 | ||
c705c78c | 554 | pr = per_cpu(processors, i); |
59a56802 | 555 | perf = per_cpu_ptr(acpi_perf_data, i); |
949dd8c1 KRW |
556 | if (!pr) |
557 | continue; | |
558 | ||
c705c78c KRW |
559 | pr->performance = perf; |
560 | rc = acpi_processor_get_performance_info(pr); | |
27257fc0 | 561 | if (rc) |
59a56802 KRW |
562 | goto err_out; |
563 | } | |
59a56802 | 564 | |
3fac1014 | 565 | rc = xen_upload_processor_pm_data(); |
17f9b896 KRW |
566 | if (rc) |
567 | goto err_unregister; | |
59a56802 | 568 | |
1914f0cd | 569 | register_syscore_ops(&xap_syscore_ops); |
3fac1014 | 570 | |
59a56802 KRW |
571 | return 0; |
572 | err_unregister: | |
b2f8dc4c RW |
573 | for_each_possible_cpu(i) |
574 | acpi_processor_unregister_performance(i); | |
575 | ||
59a56802 KRW |
576 | err_out: |
577 | /* Freeing a NULL pointer is OK: alloc_percpu zeroes. */ | |
578 | free_acpi_perf_data(); | |
85eb278c | 579 | bitmap_free(acpi_ids_done); |
59a56802 KRW |
580 | return rc; |
581 | } | |
582 | static void __exit xen_acpi_processor_exit(void) | |
583 | { | |
584 | int i; | |
585 | ||
1914f0cd | 586 | unregister_syscore_ops(&xap_syscore_ops); |
85eb278c AS |
587 | bitmap_free(acpi_ids_done); |
588 | bitmap_free(acpi_id_present); | |
589 | bitmap_free(acpi_id_cst_present); | |
4d0f1ce6 | 590 | kfree(acpi_psd); |
b2f8dc4c RW |
591 | for_each_possible_cpu(i) |
592 | acpi_processor_unregister_performance(i); | |
593 | ||
59a56802 KRW |
594 | free_acpi_perf_data(); |
595 | } | |
596 | ||
597 | MODULE_AUTHOR("Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>"); | |
598 | MODULE_DESCRIPTION("Xen ACPI Processor P-states (and Cx) driver which uploads PM data to Xen hypervisor"); | |
599 | MODULE_LICENSE("GPL"); | |
600 | ||
601 | /* We want to be loaded before the CPU freq scaling drivers are loaded. | |
602 | * They are loaded in late_initcall. */ | |
603 | device_initcall(xen_acpi_processor_init); | |
604 | module_exit(xen_acpi_processor_exit); |