1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $) |
4 | * |
5 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> |
6 | */ |
7 | |
8 | #define pr_fmt(fmt) "ACPI: " fmt |
9 | |
10 | #include <linux/module.h> |
11 | #include <linux/init.h> |
12 | #include <linux/ioport.h> |
13 | #include <linux/kernel.h> |
14 | #include <linux/list.h> |
15 | #include <linux/sched.h> |
16 | #include <linux/pm.h> |
17 | #include <linux/device.h> |
18 | #include <linux/proc_fs.h> |
19 | #include <linux/acpi.h> |
20 | #include <linux/slab.h> |
21 | #include <linux/regulator/machine.h> |
22 | #include <linux/workqueue.h> |
23 | #include <linux/reboot.h> |
24 | #include <linux/delay.h> |
25 | #ifdef CONFIG_X86 |
26 | #include <asm/mpspec.h> |
27 | #include <linux/dmi.h> |
28 | #endif |
29 | #include <linux/acpi_viot.h> |
30 | #include <linux/pci.h> |
31 | #include <acpi/apei.h> |
32 | #include <linux/suspend.h> |
33 | #include <linux/prmt.h> |
34 | |
35 | #include "internal.h" |
36 | |
37 | struct acpi_device *acpi_root; |
38 | struct proc_dir_entry *acpi_root_dir; |
39 | EXPORT_SYMBOL(acpi_root_dir); |
40 | |
41 | #ifdef CONFIG_X86 |
42 | #ifdef CONFIG_ACPI_CUSTOM_DSDT |
43 | static inline int set_copy_dsdt(const struct dmi_system_id *id) |
44 | { |
45 | return 0; |
46 | } |
47 | #else |
48 | static int set_copy_dsdt(const struct dmi_system_id *id) |
49 | { |
50 | pr_notice("%s detected - force copy of DSDT to local memory\n" , id->ident); |
51 | acpi_gbl_copy_dsdt_locally = 1; |
52 | return 0; |
53 | } |
54 | #endif |
55 | |
56 | static const struct dmi_system_id dsdt_dmi_table[] __initconst = { |
57 | /* |
58 | * Invoke DSDT corruption work-around on all Toshiba Satellite. |
59 | * https://bugzilla.kernel.org/show_bug.cgi?id=14679 |
60 | */ |
61 | { |
62 | .callback = set_copy_dsdt, |
63 | .ident = "TOSHIBA Satellite" , |
64 | .matches = { |
65 | DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA" ), |
66 | DMI_MATCH(DMI_PRODUCT_NAME, "Satellite" ), |
67 | }, |
68 | }, |
69 | {} |
70 | }; |
71 | #endif |
72 | |
73 | /* -------------------------------------------------------------------------- |
74 | Device Management |
75 | -------------------------------------------------------------------------- */ |
76 | |
77 | acpi_status acpi_bus_get_status_handle(acpi_handle handle, |
78 | unsigned long long *sta) |
79 | { |
80 | acpi_status status; |
81 | |
82 | status = acpi_evaluate_integer(handle, pathname: "_STA" , NULL, data: sta); |
83 | if (ACPI_SUCCESS(status)) |
84 | return AE_OK; |
85 | |
86 | if (status == AE_NOT_FOUND) { |
87 | *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | |
88 | ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING; |
89 | return AE_OK; |
90 | } |
91 | return status; |
92 | } |
93 | EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle); |
94 | |
95 | int acpi_bus_get_status(struct acpi_device *device) |
96 | { |
97 | acpi_status status; |
98 | unsigned long long sta; |
99 | |
100 | if (acpi_device_override_status(adev: device, status: &sta)) { |
101 | acpi_set_device_status(adev: device, sta); |
102 | return 0; |
103 | } |
104 | |
105 | /* Battery devices must have their deps met before calling _STA */ |
106 | if (acpi_device_is_battery(adev: device) && device->dep_unmet) { |
107 | acpi_set_device_status(adev: device, sta: 0); |
108 | return 0; |
109 | } |
110 | |
111 | status = acpi_bus_get_status_handle(device->handle, &sta); |
112 | if (ACPI_FAILURE(status)) |
113 | return -ENODEV; |
114 | |
115 | acpi_set_device_status(adev: device, sta); |
116 | |
117 | if (device->status.functional && !device->status.present) { |
118 | pr_debug("Device [%s] status [%08x]: functional but not present\n" , |
119 | device->pnp.bus_id, (u32)sta); |
120 | } |
121 | |
122 | pr_debug("Device [%s] status [%08x]\n" , device->pnp.bus_id, (u32)sta); |
123 | return 0; |
124 | } |
125 | EXPORT_SYMBOL(acpi_bus_get_status); |
126 | |
127 | void acpi_bus_private_data_handler(acpi_handle handle, |
128 | void *context) |
129 | { |
130 | return; |
131 | } |
132 | EXPORT_SYMBOL(acpi_bus_private_data_handler); |
133 | |
134 | int acpi_bus_attach_private_data(acpi_handle handle, void *data) |
135 | { |
136 | acpi_status status; |
137 | |
138 | status = acpi_attach_data(object: handle, |
139 | handler: acpi_bus_private_data_handler, data); |
140 | if (ACPI_FAILURE(status)) { |
141 | acpi_handle_debug(handle, "Error attaching device data\n" ); |
142 | return -ENODEV; |
143 | } |
144 | |
145 | return 0; |
146 | } |
147 | EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data); |
148 | |
149 | int acpi_bus_get_private_data(acpi_handle handle, void **data) |
150 | { |
151 | acpi_status status; |
152 | |
153 | if (!data) |
154 | return -EINVAL; |
155 | |
156 | status = acpi_get_data(object: handle, handler: acpi_bus_private_data_handler, data); |
157 | if (ACPI_FAILURE(status)) { |
158 | acpi_handle_debug(handle, "No context for object\n" ); |
159 | return -ENODEV; |
160 | } |
161 | |
162 | return 0; |
163 | } |
164 | EXPORT_SYMBOL_GPL(acpi_bus_get_private_data); |
165 | |
166 | void acpi_bus_detach_private_data(acpi_handle handle) |
167 | { |
168 | acpi_detach_data(object: handle, handler: acpi_bus_private_data_handler); |
169 | } |
170 | EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data); |
171 | |
172 | static void acpi_print_osc_error(acpi_handle handle, |
173 | struct acpi_osc_context *context, char *error) |
174 | { |
175 | int i; |
176 | |
177 | acpi_handle_debug(handle, "(%s): %s\n" , context->uuid_str, error); |
178 | |
179 | pr_debug("_OSC request data:" ); |
180 | for (i = 0; i < context->cap.length; i += sizeof(u32)) |
181 | pr_debug(" %x" , *((u32 *)(context->cap.pointer + i))); |
182 | |
183 | pr_debug("\n" ); |
184 | } |
185 | |
186 | acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) |
187 | { |
188 | acpi_status status; |
189 | struct acpi_object_list input; |
190 | union acpi_object in_params[4]; |
191 | union acpi_object *out_obj; |
192 | guid_t guid; |
193 | u32 errors; |
194 | struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; |
195 | |
196 | if (!context) |
197 | return AE_ERROR; |
198 | if (guid_parse(uuid: context->uuid_str, u: &guid)) |
199 | return AE_ERROR; |
200 | context->ret.length = ACPI_ALLOCATE_BUFFER; |
201 | context->ret.pointer = NULL; |
202 | |
203 | /* Setting up input parameters */ |
204 | input.count = 4; |
205 | input.pointer = in_params; |
206 | in_params[0].type = ACPI_TYPE_BUFFER; |
207 | in_params[0].buffer.length = 16; |
208 | in_params[0].buffer.pointer = (u8 *)&guid; |
209 | in_params[1].type = ACPI_TYPE_INTEGER; |
210 | in_params[1].integer.value = context->rev; |
211 | in_params[2].type = ACPI_TYPE_INTEGER; |
212 | in_params[2].integer.value = context->cap.length/sizeof(u32); |
213 | in_params[3].type = ACPI_TYPE_BUFFER; |
214 | in_params[3].buffer.length = context->cap.length; |
215 | in_params[3].buffer.pointer = context->cap.pointer; |
216 | |
217 | status = acpi_evaluate_object(object: handle, pathname: "_OSC" , parameter_objects: &input, return_object_buffer: &output); |
218 | if (ACPI_FAILURE(status)) |
219 | return status; |
220 | |
221 | if (!output.length) |
222 | return AE_NULL_OBJECT; |
223 | |
224 | out_obj = output.pointer; |
225 | if (out_obj->type != ACPI_TYPE_BUFFER |
226 | || out_obj->buffer.length != context->cap.length) { |
227 | acpi_print_osc_error(handle, context, |
228 | error: "_OSC evaluation returned wrong type" ); |
229 | status = AE_TYPE; |
230 | goto out_kfree; |
231 | } |
232 | /* Need to ignore the bit0 in result code */ |
233 | errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); |
234 | if (errors) { |
235 | if (errors & OSC_REQUEST_ERROR) |
236 | acpi_print_osc_error(handle, context, |
237 | error: "_OSC request failed" ); |
238 | if (errors & OSC_INVALID_UUID_ERROR) |
239 | acpi_print_osc_error(handle, context, |
240 | error: "_OSC invalid UUID" ); |
241 | if (errors & OSC_INVALID_REVISION_ERROR) |
242 | acpi_print_osc_error(handle, context, |
243 | error: "_OSC invalid revision" ); |
244 | if (errors & OSC_CAPABILITIES_MASK_ERROR) { |
245 | if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD] |
246 | & OSC_QUERY_ENABLE) |
247 | goto out_success; |
248 | status = AE_SUPPORT; |
249 | goto out_kfree; |
250 | } |
251 | status = AE_ERROR; |
252 | goto out_kfree; |
253 | } |
254 | out_success: |
255 | context->ret.length = out_obj->buffer.length; |
256 | context->ret.pointer = kmemdup(p: out_obj->buffer.pointer, |
257 | size: context->ret.length, GFP_KERNEL); |
258 | if (!context->ret.pointer) { |
259 | status = AE_NO_MEMORY; |
260 | goto out_kfree; |
261 | } |
262 | status = AE_OK; |
263 | |
264 | out_kfree: |
265 | kfree(objp: output.pointer); |
266 | return status; |
267 | } |
268 | EXPORT_SYMBOL(acpi_run_osc); |
269 | |
270 | bool osc_sb_apei_support_acked; |
271 | |
272 | /* |
273 | * ACPI 6.0 Section 8.4.4.2 Idle State Coordination |
274 | * OSPM supports platform coordinated low power idle(LPI) states |
275 | */ |
276 | bool osc_pc_lpi_support_confirmed; |
277 | EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed); |
278 | |
279 | /* |
280 | * ACPI 6.2 Section 6.2.11.2 'Platform-Wide OSPM Capabilities': |
281 | * Starting with ACPI Specification 6.2, all _CPC registers can be in |
282 | * PCC, System Memory, System IO, or Functional Fixed Hardware address |
283 | * spaces. OSPM support for this more flexible register space scheme is |
284 | * indicated by the “Flexible Address Space for CPPC Registers” _OSC bit. |
285 | * |
286 | * Otherwise (cf ACPI 6.1, s8.4.7.1.1.X), _CPC registers must be in: |
287 | * - PCC or Functional Fixed Hardware address space if defined |
288 | * - SystemMemory address space (NULL register) if not defined |
289 | */ |
290 | bool osc_cpc_flexible_adr_space_confirmed; |
291 | EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed); |
292 | |
293 | /* |
294 | * ACPI 6.4 Operating System Capabilities for USB. |
295 | */ |
296 | bool osc_sb_native_usb4_support_confirmed; |
297 | EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed); |
298 | |
299 | bool osc_sb_cppc2_support_acked; |
300 | |
301 | static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48" ; |
302 | static void acpi_bus_osc_negotiate_platform_control(void) |
303 | { |
304 | u32 capbuf[2], *capbuf_ret; |
305 | struct acpi_osc_context context = { |
306 | .uuid_str = sb_uuid_str, |
307 | .rev = 1, |
308 | .cap.length = 8, |
309 | .cap.pointer = capbuf, |
310 | }; |
311 | acpi_handle handle; |
312 | |
313 | capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; |
314 | capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */ |
315 | if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR)) |
316 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT; |
317 | if (IS_ENABLED(CONFIG_ACPI_PROCESSOR)) |
318 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT; |
319 | |
320 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT; |
321 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT; |
322 | if (IS_ENABLED(CONFIG_ACPI_PRMT)) |
323 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT; |
324 | if (IS_ENABLED(CONFIG_ACPI_FFH)) |
325 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_FFH_OPR_SUPPORT; |
326 | |
327 | #ifdef CONFIG_ARM64 |
328 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT; |
329 | #endif |
330 | #ifdef CONFIG_X86 |
331 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT; |
332 | #endif |
333 | |
334 | #ifdef CONFIG_ACPI_CPPC_LIB |
335 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT; |
336 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT; |
337 | #endif |
338 | |
339 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_FLEXIBLE_ADR_SPACE; |
340 | |
341 | if (IS_ENABLED(CONFIG_SCHED_MC_PRIO)) |
342 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT; |
343 | |
344 | if (IS_ENABLED(CONFIG_USB4)) |
345 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT; |
346 | |
347 | if (!ghes_disable) |
348 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT; |
349 | if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB" , &handle))) |
350 | return; |
351 | |
352 | if (ACPI_FAILURE(acpi_run_osc(handle, &context))) |
353 | return; |
354 | |
355 | capbuf_ret = context.ret.pointer; |
356 | if (context.ret.length <= OSC_SUPPORT_DWORD) { |
357 | kfree(objp: context.ret.pointer); |
358 | return; |
359 | } |
360 | |
361 | /* |
362 | * Now run _OSC again with query flag clear and with the caps |
363 | * supported by both the OS and the platform. |
364 | */ |
365 | capbuf[OSC_QUERY_DWORD] = 0; |
366 | capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD]; |
367 | kfree(objp: context.ret.pointer); |
368 | |
369 | if (ACPI_FAILURE(acpi_run_osc(handle, &context))) |
370 | return; |
371 | |
372 | capbuf_ret = context.ret.pointer; |
373 | if (context.ret.length > OSC_SUPPORT_DWORD) { |
374 | #ifdef CONFIG_ACPI_CPPC_LIB |
375 | osc_sb_cppc2_support_acked = capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPCV2_SUPPORT; |
376 | #endif |
377 | |
378 | osc_sb_apei_support_acked = |
379 | capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT; |
380 | osc_pc_lpi_support_confirmed = |
381 | capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT; |
382 | osc_sb_native_usb4_support_confirmed = |
383 | capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT; |
384 | osc_cpc_flexible_adr_space_confirmed = |
385 | capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPC_FLEXIBLE_ADR_SPACE; |
386 | } |
387 | |
388 | kfree(objp: context.ret.pointer); |
389 | } |
390 | |
391 | /* |
392 | * Native control of USB4 capabilities. If any of the tunneling bits is |
393 | * set it means OS is in control and we use software based connection |
394 | * manager. |
395 | */ |
396 | u32 osc_sb_native_usb4_control; |
397 | EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control); |
398 | |
399 | static void acpi_bus_decode_usb_osc(const char *msg, u32 bits) |
400 | { |
401 | pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n" , msg, |
402 | (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-', |
403 | (bits & OSC_USB_DP_TUNNELING) ? '+' : '-', |
404 | (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-', |
405 | (bits & OSC_USB_XDOMAIN) ? '+' : '-'); |
406 | } |
407 | |
408 | static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A" ; |
409 | static void acpi_bus_osc_negotiate_usb_control(void) |
410 | { |
411 | u32 capbuf[3], *capbuf_ret; |
412 | struct acpi_osc_context context = { |
413 | .uuid_str = sb_usb_uuid_str, |
414 | .rev = 1, |
415 | .cap.length = sizeof(capbuf), |
416 | .cap.pointer = capbuf, |
417 | }; |
418 | acpi_handle handle; |
419 | acpi_status status; |
420 | u32 control; |
421 | |
422 | if (!osc_sb_native_usb4_support_confirmed) |
423 | return; |
424 | |
425 | if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB" , &handle))) |
426 | return; |
427 | |
428 | control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING | |
429 | OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN; |
430 | |
431 | /* |
432 | * Run _OSC first with query bit set, trying to get control over |
433 | * all tunneling. The platform can then clear out bits in the |
434 | * control dword that it does not want to grant to the OS. |
435 | */ |
436 | capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; |
437 | capbuf[OSC_SUPPORT_DWORD] = 0; |
438 | capbuf[OSC_CONTROL_DWORD] = control; |
439 | |
440 | status = acpi_run_osc(handle, &context); |
441 | if (ACPI_FAILURE(status)) |
442 | return; |
443 | |
444 | if (context.ret.length != sizeof(capbuf)) { |
445 | pr_info("USB4 _OSC: returned invalid length buffer\n" ); |
446 | goto out_free; |
447 | } |
448 | |
449 | /* |
450 | * Run _OSC again now with query bit clear and the control dword |
451 | * matching what the platform granted (which may not have all |
452 | * the control bits set). |
453 | */ |
454 | capbuf_ret = context.ret.pointer; |
455 | |
456 | capbuf[OSC_QUERY_DWORD] = 0; |
457 | capbuf[OSC_CONTROL_DWORD] = capbuf_ret[OSC_CONTROL_DWORD]; |
458 | |
459 | kfree(objp: context.ret.pointer); |
460 | |
461 | status = acpi_run_osc(handle, &context); |
462 | if (ACPI_FAILURE(status)) |
463 | return; |
464 | |
465 | if (context.ret.length != sizeof(capbuf)) { |
466 | pr_info("USB4 _OSC: returned invalid length buffer\n" ); |
467 | goto out_free; |
468 | } |
469 | |
470 | osc_sb_native_usb4_control = |
471 | control & acpi_osc_ctx_get_pci_control(context: &context); |
472 | |
473 | acpi_bus_decode_usb_osc(msg: "USB4 _OSC: OS supports" , bits: control); |
474 | acpi_bus_decode_usb_osc(msg: "USB4 _OSC: OS controls" , |
475 | bits: osc_sb_native_usb4_control); |
476 | |
477 | out_free: |
478 | kfree(objp: context.ret.pointer); |
479 | } |
480 | |
481 | /* -------------------------------------------------------------------------- |
482 | Notification Handling |
483 | -------------------------------------------------------------------------- */ |
484 | |
485 | /** |
486 | * acpi_bus_notify - Global system-level (0x00-0x7F) notifications handler |
487 | * @handle: Target ACPI object. |
488 | * @type: Notification type. |
489 | * @data: Ignored. |
490 | * |
491 | * This only handles notifications related to device hotplug. |
492 | */ |
493 | static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) |
494 | { |
495 | struct acpi_device *adev; |
496 | |
497 | switch (type) { |
498 | case ACPI_NOTIFY_BUS_CHECK: |
499 | acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n" ); |
500 | break; |
501 | |
502 | case ACPI_NOTIFY_DEVICE_CHECK: |
503 | acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n" ); |
504 | break; |
505 | |
506 | case ACPI_NOTIFY_DEVICE_WAKE: |
507 | acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n" ); |
508 | return; |
509 | |
510 | case ACPI_NOTIFY_EJECT_REQUEST: |
511 | acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n" ); |
512 | break; |
513 | |
514 | case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: |
515 | acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n" ); |
516 | /* TBD: Exactly what does 'light' mean? */ |
517 | return; |
518 | |
519 | case ACPI_NOTIFY_FREQUENCY_MISMATCH: |
520 | acpi_handle_err(handle, "Device cannot be configured due " |
521 | "to a frequency mismatch\n" ); |
522 | return; |
523 | |
524 | case ACPI_NOTIFY_BUS_MODE_MISMATCH: |
525 | acpi_handle_err(handle, "Device cannot be configured due " |
526 | "to a bus mode mismatch\n" ); |
527 | return; |
528 | |
529 | case ACPI_NOTIFY_POWER_FAULT: |
530 | acpi_handle_err(handle, "Device has suffered a power fault\n" ); |
531 | return; |
532 | |
533 | default: |
534 | acpi_handle_debug(handle, "Unknown event type 0x%x\n" , type); |
535 | return; |
536 | } |
537 | |
538 | adev = acpi_get_acpi_dev(handle); |
539 | |
540 | if (adev && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type))) |
541 | return; |
542 | |
543 | acpi_put_acpi_dev(adev); |
544 | |
545 | acpi_evaluate_ost(handle, source_event: type, ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL); |
546 | } |
547 | |
548 | static void acpi_notify_device(acpi_handle handle, u32 event, void *data) |
549 | { |
550 | struct acpi_device *device = data; |
551 | struct acpi_driver *acpi_drv = to_acpi_driver(device->dev.driver); |
552 | |
553 | acpi_drv->ops.notify(device, event); |
554 | } |
555 | |
556 | static int acpi_device_install_notify_handler(struct acpi_device *device, |
557 | struct acpi_driver *acpi_drv) |
558 | { |
559 | u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ? |
560 | ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY; |
561 | acpi_status status; |
562 | |
563 | status = acpi_install_notify_handler(device: device->handle, handler_type: type, |
564 | handler: acpi_notify_device, context: device); |
565 | if (ACPI_FAILURE(status)) |
566 | return -EINVAL; |
567 | |
568 | return 0; |
569 | } |
570 | |
571 | static void acpi_device_remove_notify_handler(struct acpi_device *device, |
572 | struct acpi_driver *acpi_drv) |
573 | { |
574 | u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ? |
575 | ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY; |
576 | |
577 | acpi_remove_notify_handler(device: device->handle, handler_type: type, |
578 | handler: acpi_notify_device); |
579 | |
580 | acpi_os_wait_events_complete(); |
581 | } |
582 | |
583 | int acpi_dev_install_notify_handler(struct acpi_device *adev, |
584 | u32 handler_type, |
585 | acpi_notify_handler handler, void *context) |
586 | { |
587 | acpi_status status; |
588 | |
589 | status = acpi_install_notify_handler(device: adev->handle, handler_type, |
590 | handler, context); |
591 | if (ACPI_FAILURE(status)) |
592 | return -ENODEV; |
593 | |
594 | return 0; |
595 | } |
596 | EXPORT_SYMBOL_GPL(acpi_dev_install_notify_handler); |
597 | |
598 | void acpi_dev_remove_notify_handler(struct acpi_device *adev, |
599 | u32 handler_type, |
600 | acpi_notify_handler handler) |
601 | { |
602 | acpi_remove_notify_handler(device: adev->handle, handler_type, handler); |
603 | acpi_os_wait_events_complete(); |
604 | } |
605 | EXPORT_SYMBOL_GPL(acpi_dev_remove_notify_handler); |
606 | |
607 | /* Handle events targeting \_SB device (at present only graceful shutdown) */ |
608 | |
609 | #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81 |
610 | #define ACPI_SB_INDICATE_INTERVAL 10000 |
611 | |
612 | static void sb_notify_work(struct work_struct *dummy) |
613 | { |
614 | acpi_handle sb_handle; |
615 | |
616 | orderly_poweroff(force: true); |
617 | |
618 | /* |
619 | * After initiating graceful shutdown, the ACPI spec requires OSPM |
620 | * to evaluate _OST method once every 10seconds to indicate that |
621 | * the shutdown is in progress |
622 | */ |
623 | acpi_get_handle(NULL, pathname: "\\_SB" , ret_handle: &sb_handle); |
624 | while (1) { |
625 | pr_info("Graceful shutdown in progress.\n" ); |
626 | acpi_evaluate_ost(handle: sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN, |
627 | ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL); |
628 | msleep(ACPI_SB_INDICATE_INTERVAL); |
629 | } |
630 | } |
631 | |
632 | static void acpi_sb_notify(acpi_handle handle, u32 event, void *data) |
633 | { |
634 | static DECLARE_WORK(acpi_sb_work, sb_notify_work); |
635 | |
636 | if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) { |
637 | if (!work_busy(work: &acpi_sb_work)) |
638 | schedule_work(work: &acpi_sb_work); |
639 | } else { |
640 | pr_warn("event %x is not supported by \\_SB device\n" , event); |
641 | } |
642 | } |
643 | |
644 | static int __init acpi_setup_sb_notify_handler(void) |
645 | { |
646 | acpi_handle sb_handle; |
647 | |
648 | if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB" , &sb_handle))) |
649 | return -ENXIO; |
650 | |
651 | if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY, |
652 | acpi_sb_notify, NULL))) |
653 | return -EINVAL; |
654 | |
655 | return 0; |
656 | } |
657 | |
658 | /* -------------------------------------------------------------------------- |
659 | Device Matching |
660 | -------------------------------------------------------------------------- */ |
661 | |
662 | /** |
663 | * acpi_get_first_physical_node - Get first physical node of an ACPI device |
664 | * @adev: ACPI device in question |
665 | * |
666 | * Return: First physical node of ACPI device @adev |
667 | */ |
668 | struct device *acpi_get_first_physical_node(struct acpi_device *adev) |
669 | { |
670 | struct mutex *physical_node_lock = &adev->physical_node_lock; |
671 | struct device *phys_dev; |
672 | |
673 | mutex_lock(physical_node_lock); |
674 | if (list_empty(head: &adev->physical_node_list)) { |
675 | phys_dev = NULL; |
676 | } else { |
677 | const struct acpi_device_physical_node *node; |
678 | |
679 | node = list_first_entry(&adev->physical_node_list, |
680 | struct acpi_device_physical_node, node); |
681 | |
682 | phys_dev = node->dev; |
683 | } |
684 | mutex_unlock(lock: physical_node_lock); |
685 | return phys_dev; |
686 | } |
687 | EXPORT_SYMBOL_GPL(acpi_get_first_physical_node); |
688 | |
689 | static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev, |
690 | const struct device *dev) |
691 | { |
692 | const struct device *phys_dev = acpi_get_first_physical_node(adev); |
693 | |
694 | return phys_dev && phys_dev == dev ? adev : NULL; |
695 | } |
696 | |
697 | /** |
698 | * acpi_device_is_first_physical_node - Is given dev first physical node |
699 | * @adev: ACPI companion device |
700 | * @dev: Physical device to check |
701 | * |
702 | * Function checks if given @dev is the first physical devices attached to |
703 | * the ACPI companion device. This distinction is needed in some cases |
704 | * where the same companion device is shared between many physical devices. |
705 | * |
706 | * Note that the caller have to provide valid @adev pointer. |
707 | */ |
708 | bool acpi_device_is_first_physical_node(struct acpi_device *adev, |
709 | const struct device *dev) |
710 | { |
711 | return !!acpi_primary_dev_companion(adev, dev); |
712 | } |
713 | |
714 | /* |
715 | * acpi_companion_match() - Can we match via ACPI companion device |
716 | * @dev: Device in question |
717 | * |
718 | * Check if the given device has an ACPI companion and if that companion has |
719 | * a valid list of PNP IDs, and if the device is the first (primary) physical |
720 | * device associated with it. Return the companion pointer if that's the case |
721 | * or NULL otherwise. |
722 | * |
723 | * If multiple physical devices are attached to a single ACPI companion, we need |
724 | * to be careful. The usage scenario for this kind of relationship is that all |
725 | * of the physical devices in question use resources provided by the ACPI |
726 | * companion. A typical case is an MFD device where all the sub-devices share |
727 | * the parent's ACPI companion. In such cases we can only allow the primary |
728 | * (first) physical device to be matched with the help of the companion's PNP |
729 | * IDs. |
730 | * |
731 | * Additional physical devices sharing the ACPI companion can still use |
732 | * resources available from it but they will be matched normally using functions |
733 | * provided by their bus types (and analogously for their modalias). |
734 | */ |
735 | const struct acpi_device *acpi_companion_match(const struct device *dev) |
736 | { |
737 | struct acpi_device *adev; |
738 | |
739 | adev = ACPI_COMPANION(dev); |
740 | if (!adev) |
741 | return NULL; |
742 | |
743 | if (list_empty(head: &adev->pnp.ids)) |
744 | return NULL; |
745 | |
746 | return acpi_primary_dev_companion(adev, dev); |
747 | } |
748 | |
749 | /** |
750 | * acpi_of_match_device - Match device object using the "compatible" property. |
751 | * @adev: ACPI device object to match. |
752 | * @of_match_table: List of device IDs to match against. |
753 | * @of_id: OF ID if matched |
754 | * |
755 | * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of |
756 | * identifiers and a _DSD object with the "compatible" property, use that |
757 | * property to match against the given list of identifiers. |
758 | */ |
759 | static bool acpi_of_match_device(const struct acpi_device *adev, |
760 | const struct of_device_id *of_match_table, |
761 | const struct of_device_id **of_id) |
762 | { |
763 | const union acpi_object *of_compatible, *obj; |
764 | int i, nval; |
765 | |
766 | if (!adev) |
767 | return false; |
768 | |
769 | of_compatible = adev->data.of_compatible; |
770 | if (!of_match_table || !of_compatible) |
771 | return false; |
772 | |
773 | if (of_compatible->type == ACPI_TYPE_PACKAGE) { |
774 | nval = of_compatible->package.count; |
775 | obj = of_compatible->package.elements; |
776 | } else { /* Must be ACPI_TYPE_STRING. */ |
777 | nval = 1; |
778 | obj = of_compatible; |
779 | } |
780 | /* Now we can look for the driver DT compatible strings */ |
781 | for (i = 0; i < nval; i++, obj++) { |
782 | const struct of_device_id *id; |
783 | |
784 | for (id = of_match_table; id->compatible[0]; id++) |
785 | if (!strcasecmp(s1: obj->string.pointer, s2: id->compatible)) { |
786 | if (of_id) |
787 | *of_id = id; |
788 | return true; |
789 | } |
790 | } |
791 | |
792 | return false; |
793 | } |
794 | |
795 | static bool acpi_of_modalias(struct acpi_device *adev, |
796 | char *modalias, size_t len) |
797 | { |
798 | const union acpi_object *of_compatible; |
799 | const union acpi_object *obj; |
800 | const char *str, *chr; |
801 | |
802 | of_compatible = adev->data.of_compatible; |
803 | if (!of_compatible) |
804 | return false; |
805 | |
806 | if (of_compatible->type == ACPI_TYPE_PACKAGE) |
807 | obj = of_compatible->package.elements; |
808 | else /* Must be ACPI_TYPE_STRING. */ |
809 | obj = of_compatible; |
810 | |
811 | str = obj->string.pointer; |
812 | chr = strchr(str, ','); |
813 | strscpy(modalias, chr ? chr + 1 : str, len); |
814 | |
815 | return true; |
816 | } |
817 | |
818 | /** |
819 | * acpi_set_modalias - Set modalias using "compatible" property or supplied ID |
820 | * @adev: ACPI device object to match |
821 | * @default_id: ID string to use as default if no compatible string found |
822 | * @modalias: Pointer to buffer that modalias value will be copied into |
823 | * @len: Length of modalias buffer |
824 | * |
825 | * This is a counterpart of of_alias_from_compatible() for struct acpi_device |
826 | * objects. If there is a compatible string for @adev, it will be copied to |
827 | * @modalias with the vendor prefix stripped; otherwise, @default_id will be |
828 | * used. |
829 | */ |
830 | void acpi_set_modalias(struct acpi_device *adev, const char *default_id, |
831 | char *modalias, size_t len) |
832 | { |
833 | if (!acpi_of_modalias(adev, modalias, len)) |
834 | strscpy(modalias, default_id, len); |
835 | } |
836 | EXPORT_SYMBOL_GPL(acpi_set_modalias); |
837 | |
838 | static bool __acpi_match_device_cls(const struct acpi_device_id *id, |
839 | struct acpi_hardware_id *hwid) |
840 | { |
841 | int i, msk, byte_shift; |
842 | char buf[3]; |
843 | |
844 | if (!id->cls) |
845 | return false; |
846 | |
847 | /* Apply class-code bitmask, before checking each class-code byte */ |
848 | for (i = 1; i <= 3; i++) { |
849 | byte_shift = 8 * (3 - i); |
850 | msk = (id->cls_msk >> byte_shift) & 0xFF; |
851 | if (!msk) |
852 | continue; |
853 | |
854 | sprintf(buf, fmt: "%02x" , (id->cls >> byte_shift) & msk); |
855 | if (strncmp(buf, &hwid->id[(i - 1) * 2], 2)) |
856 | return false; |
857 | } |
858 | return true; |
859 | } |
860 | |
861 | static bool __acpi_match_device(const struct acpi_device *device, |
862 | const struct acpi_device_id *acpi_ids, |
863 | const struct of_device_id *of_ids, |
864 | const struct acpi_device_id **acpi_id, |
865 | const struct of_device_id **of_id) |
866 | { |
867 | const struct acpi_device_id *id; |
868 | struct acpi_hardware_id *hwid; |
869 | |
870 | /* |
871 | * If the device is not present, it is unnecessary to load device |
872 | * driver for it. |
873 | */ |
874 | if (!device || !device->status.present) |
875 | return false; |
876 | |
877 | list_for_each_entry(hwid, &device->pnp.ids, list) { |
878 | /* First, check the ACPI/PNP IDs provided by the caller. */ |
879 | if (acpi_ids) { |
880 | for (id = acpi_ids; id->id[0] || id->cls; id++) { |
881 | if (id->id[0] && !strcmp((char *)id->id, hwid->id)) |
882 | goto out_acpi_match; |
883 | if (id->cls && __acpi_match_device_cls(id, hwid)) |
884 | goto out_acpi_match; |
885 | } |
886 | } |
887 | |
888 | /* |
889 | * Next, check ACPI_DT_NAMESPACE_HID and try to match the |
890 | * "compatible" property if found. |
891 | */ |
892 | if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)) |
893 | return acpi_of_match_device(adev: device, of_match_table: of_ids, of_id); |
894 | } |
895 | return false; |
896 | |
897 | out_acpi_match: |
898 | if (acpi_id) |
899 | *acpi_id = id; |
900 | return true; |
901 | } |
902 | |
903 | /** |
904 | * acpi_match_acpi_device - Match an ACPI device against a given list of ACPI IDs |
905 | * @ids: Array of struct acpi_device_id objects to match against. |
906 | * @adev: The ACPI device pointer to match. |
907 | * |
908 | * Match the ACPI device @adev against a given list of ACPI IDs @ids. |
909 | * |
910 | * Return: |
911 | * a pointer to the first matching ACPI ID on success or %NULL on failure. |
912 | */ |
913 | const struct acpi_device_id *acpi_match_acpi_device(const struct acpi_device_id *ids, |
914 | const struct acpi_device *adev) |
915 | { |
916 | const struct acpi_device_id *id = NULL; |
917 | |
918 | __acpi_match_device(device: adev, acpi_ids: ids, NULL, acpi_id: &id, NULL); |
919 | return id; |
920 | } |
921 | EXPORT_SYMBOL_GPL(acpi_match_acpi_device); |
922 | |
923 | /** |
924 | * acpi_match_device - Match a struct device against a given list of ACPI IDs |
925 | * @ids: Array of struct acpi_device_id object to match against. |
926 | * @dev: The device structure to match. |
927 | * |
928 | * Check if @dev has a valid ACPI handle and if there is a struct acpi_device |
929 | * object for that handle and use that object to match against a given list of |
930 | * device IDs. |
931 | * |
932 | * Return a pointer to the first matching ID on success or %NULL on failure. |
933 | */ |
934 | const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, |
935 | const struct device *dev) |
936 | { |
937 | return acpi_match_acpi_device(ids, acpi_companion_match(dev)); |
938 | } |
939 | EXPORT_SYMBOL_GPL(acpi_match_device); |
940 | |
941 | static const void *acpi_of_device_get_match_data(const struct device *dev) |
942 | { |
943 | struct acpi_device *adev = ACPI_COMPANION(dev); |
944 | const struct of_device_id *match = NULL; |
945 | |
946 | if (!acpi_of_match_device(adev, of_match_table: dev->driver->of_match_table, of_id: &match)) |
947 | return NULL; |
948 | |
949 | return match->data; |
950 | } |
951 | |
952 | const void *acpi_device_get_match_data(const struct device *dev) |
953 | { |
954 | const struct acpi_device_id *acpi_ids = dev->driver->acpi_match_table; |
955 | const struct acpi_device_id *match; |
956 | |
957 | if (!acpi_ids) |
958 | return acpi_of_device_get_match_data(dev); |
959 | |
960 | match = acpi_match_device(acpi_ids, dev); |
961 | if (!match) |
962 | return NULL; |
963 | |
964 | return (const void *)match->driver_data; |
965 | } |
966 | EXPORT_SYMBOL_GPL(acpi_device_get_match_data); |
967 | |
968 | int acpi_match_device_ids(struct acpi_device *device, |
969 | const struct acpi_device_id *ids) |
970 | { |
971 | return __acpi_match_device(device, acpi_ids: ids, NULL, NULL, NULL) ? 0 : -ENOENT; |
972 | } |
973 | EXPORT_SYMBOL(acpi_match_device_ids); |
974 | |
975 | bool acpi_driver_match_device(struct device *dev, |
976 | const struct device_driver *drv) |
977 | { |
978 | const struct acpi_device_id *acpi_ids = drv->acpi_match_table; |
979 | const struct of_device_id *of_ids = drv->of_match_table; |
980 | |
981 | if (!acpi_ids) |
982 | return acpi_of_match_device(ACPI_COMPANION(dev), of_match_table: of_ids, NULL); |
983 | |
984 | return __acpi_match_device(device: acpi_companion_match(dev), acpi_ids, of_ids, NULL, NULL); |
985 | } |
986 | EXPORT_SYMBOL_GPL(acpi_driver_match_device); |
987 | |
988 | /* -------------------------------------------------------------------------- |
989 | ACPI Driver Management |
990 | -------------------------------------------------------------------------- */ |
991 | |
992 | /** |
993 | * acpi_bus_register_driver - register a driver with the ACPI bus |
994 | * @driver: driver being registered |
995 | * |
996 | * Registers a driver with the ACPI bus. Searches the namespace for all |
997 | * devices that match the driver's criteria and binds. Returns zero for |
998 | * success or a negative error status for failure. |
999 | */ |
1000 | int acpi_bus_register_driver(struct acpi_driver *driver) |
1001 | { |
1002 | if (acpi_disabled) |
1003 | return -ENODEV; |
1004 | driver->drv.name = driver->name; |
1005 | driver->drv.bus = &acpi_bus_type; |
1006 | driver->drv.owner = driver->owner; |
1007 | |
1008 | return driver_register(drv: &driver->drv); |
1009 | } |
1010 | |
1011 | EXPORT_SYMBOL(acpi_bus_register_driver); |
1012 | |
1013 | /** |
1014 | * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus |
1015 | * @driver: driver to unregister |
1016 | * |
1017 | * Unregisters a driver with the ACPI bus. Searches the namespace for all |
1018 | * devices that match the driver's criteria and unbinds. |
1019 | */ |
1020 | void acpi_bus_unregister_driver(struct acpi_driver *driver) |
1021 | { |
1022 | driver_unregister(drv: &driver->drv); |
1023 | } |
1024 | |
1025 | EXPORT_SYMBOL(acpi_bus_unregister_driver); |
1026 | |
1027 | /* -------------------------------------------------------------------------- |
1028 | ACPI Bus operations |
1029 | -------------------------------------------------------------------------- */ |
1030 | |
1031 | static int acpi_bus_match(struct device *dev, struct device_driver *drv) |
1032 | { |
1033 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
1034 | struct acpi_driver *acpi_drv = to_acpi_driver(drv); |
1035 | |
1036 | return acpi_dev->flags.match_driver |
1037 | && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); |
1038 | } |
1039 | |
1040 | static int acpi_device_uevent(const struct device *dev, struct kobj_uevent_env *env) |
1041 | { |
1042 | return __acpi_device_uevent_modalias(to_acpi_device(dev), env); |
1043 | } |
1044 | |
1045 | static int acpi_device_probe(struct device *dev) |
1046 | { |
1047 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
1048 | struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); |
1049 | int ret; |
1050 | |
1051 | if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev)) |
1052 | return -EINVAL; |
1053 | |
1054 | if (!acpi_drv->ops.add) |
1055 | return -ENOSYS; |
1056 | |
1057 | ret = acpi_drv->ops.add(acpi_dev); |
1058 | if (ret) { |
1059 | acpi_dev->driver_data = NULL; |
1060 | return ret; |
1061 | } |
1062 | |
1063 | pr_debug("Driver [%s] successfully bound to device [%s]\n" , |
1064 | acpi_drv->name, acpi_dev->pnp.bus_id); |
1065 | |
1066 | if (acpi_drv->ops.notify) { |
1067 | ret = acpi_device_install_notify_handler(device: acpi_dev, acpi_drv); |
1068 | if (ret) { |
1069 | if (acpi_drv->ops.remove) |
1070 | acpi_drv->ops.remove(acpi_dev); |
1071 | |
1072 | acpi_dev->driver_data = NULL; |
1073 | return ret; |
1074 | } |
1075 | } |
1076 | |
1077 | pr_debug("Found driver [%s] for device [%s]\n" , acpi_drv->name, |
1078 | acpi_dev->pnp.bus_id); |
1079 | |
1080 | get_device(dev); |
1081 | return 0; |
1082 | } |
1083 | |
1084 | static void acpi_device_remove(struct device *dev) |
1085 | { |
1086 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
1087 | struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); |
1088 | |
1089 | if (acpi_drv->ops.notify) |
1090 | acpi_device_remove_notify_handler(device: acpi_dev, acpi_drv); |
1091 | |
1092 | if (acpi_drv->ops.remove) |
1093 | acpi_drv->ops.remove(acpi_dev); |
1094 | |
1095 | acpi_dev->driver_data = NULL; |
1096 | |
1097 | put_device(dev); |
1098 | } |
1099 | |
1100 | const struct bus_type acpi_bus_type = { |
1101 | .name = "acpi" , |
1102 | .match = acpi_bus_match, |
1103 | .probe = acpi_device_probe, |
1104 | .remove = acpi_device_remove, |
1105 | .uevent = acpi_device_uevent, |
1106 | }; |
1107 | |
1108 | int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data) |
1109 | { |
1110 | return bus_for_each_dev(bus: &acpi_bus_type, NULL, data, fn); |
1111 | } |
1112 | EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev); |
1113 | |
1114 | struct acpi_dev_walk_context { |
1115 | int (*fn)(struct acpi_device *, void *); |
1116 | void *data; |
1117 | }; |
1118 | |
1119 | static int acpi_dev_for_one_check(struct device *dev, void *context) |
1120 | { |
1121 | struct acpi_dev_walk_context *adwc = context; |
1122 | |
1123 | if (dev->bus != &acpi_bus_type) |
1124 | return 0; |
1125 | |
1126 | return adwc->fn(to_acpi_device(dev), adwc->data); |
1127 | } |
1128 | EXPORT_SYMBOL_GPL(acpi_dev_for_each_child); |
1129 | |
1130 | int acpi_dev_for_each_child(struct acpi_device *adev, |
1131 | int (*fn)(struct acpi_device *, void *), void *data) |
1132 | { |
1133 | struct acpi_dev_walk_context adwc = { |
1134 | .fn = fn, |
1135 | .data = data, |
1136 | }; |
1137 | |
1138 | return device_for_each_child(dev: &adev->dev, data: &adwc, fn: acpi_dev_for_one_check); |
1139 | } |
1140 | |
1141 | int acpi_dev_for_each_child_reverse(struct acpi_device *adev, |
1142 | int (*fn)(struct acpi_device *, void *), |
1143 | void *data) |
1144 | { |
1145 | struct acpi_dev_walk_context adwc = { |
1146 | .fn = fn, |
1147 | .data = data, |
1148 | }; |
1149 | |
1150 | return device_for_each_child_reverse(dev: &adev->dev, data: &adwc, fn: acpi_dev_for_one_check); |
1151 | } |
1152 | |
1153 | /* -------------------------------------------------------------------------- |
1154 | Initialization/Cleanup |
1155 | -------------------------------------------------------------------------- */ |
1156 | |
1157 | static int __init acpi_bus_init_irq(void) |
1158 | { |
1159 | acpi_status status; |
1160 | char *message = NULL; |
1161 | |
1162 | |
1163 | /* |
1164 | * Let the system know what interrupt model we are using by |
1165 | * evaluating the \_PIC object, if exists. |
1166 | */ |
1167 | |
1168 | switch (acpi_irq_model) { |
1169 | case ACPI_IRQ_MODEL_PIC: |
1170 | message = "PIC" ; |
1171 | break; |
1172 | case ACPI_IRQ_MODEL_IOAPIC: |
1173 | message = "IOAPIC" ; |
1174 | break; |
1175 | case ACPI_IRQ_MODEL_IOSAPIC: |
1176 | message = "IOSAPIC" ; |
1177 | break; |
1178 | case ACPI_IRQ_MODEL_GIC: |
1179 | message = "GIC" ; |
1180 | break; |
1181 | case ACPI_IRQ_MODEL_PLATFORM: |
1182 | message = "platform specific model" ; |
1183 | break; |
1184 | case ACPI_IRQ_MODEL_LPIC: |
1185 | message = "LPIC" ; |
1186 | break; |
1187 | default: |
1188 | pr_info("Unknown interrupt routing model\n" ); |
1189 | return -ENODEV; |
1190 | } |
1191 | |
1192 | pr_info("Using %s for interrupt routing\n" , message); |
1193 | |
1194 | status = acpi_execute_simple_method(NULL, method: "\\_PIC" , arg: acpi_irq_model); |
1195 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { |
1196 | pr_info("_PIC evaluation failed: %s\n" , acpi_format_exception(status)); |
1197 | return -ENODEV; |
1198 | } |
1199 | |
1200 | return 0; |
1201 | } |
1202 | |
1203 | /** |
1204 | * acpi_early_init - Initialize ACPICA and populate the ACPI namespace. |
1205 | * |
1206 | * The ACPI tables are accessible after this, but the handling of events has not |
1207 | * been initialized and the global lock is not available yet, so AML should not |
1208 | * be executed at this point. |
1209 | * |
1210 | * Doing this before switching the EFI runtime services to virtual mode allows |
1211 | * the EfiBootServices memory to be freed slightly earlier on boot. |
1212 | */ |
1213 | void __init acpi_early_init(void) |
1214 | { |
1215 | acpi_status status; |
1216 | |
1217 | if (acpi_disabled) |
1218 | return; |
1219 | |
1220 | pr_info("Core revision %08x\n" , ACPI_CA_VERSION); |
1221 | |
1222 | /* enable workarounds, unless strict ACPI spec. compliance */ |
1223 | if (!acpi_strict) |
1224 | acpi_gbl_enable_interpreter_slack = TRUE; |
1225 | |
1226 | acpi_permanent_mmap = true; |
1227 | |
1228 | #ifdef CONFIG_X86 |
1229 | /* |
1230 | * If the machine falls into the DMI check table, |
1231 | * DSDT will be copied to memory. |
1232 | * Note that calling dmi_check_system() here on other architectures |
1233 | * would not be OK because only x86 initializes dmi early enough. |
1234 | * Thankfully only x86 systems need such quirks for now. |
1235 | */ |
1236 | dmi_check_system(list: dsdt_dmi_table); |
1237 | #endif |
1238 | |
1239 | status = acpi_reallocate_root_table(); |
1240 | if (ACPI_FAILURE(status)) { |
1241 | pr_err("Unable to reallocate ACPI tables\n" ); |
1242 | goto error0; |
1243 | } |
1244 | |
1245 | status = acpi_initialize_subsystem(); |
1246 | if (ACPI_FAILURE(status)) { |
1247 | pr_err("Unable to initialize the ACPI Interpreter\n" ); |
1248 | goto error0; |
1249 | } |
1250 | |
1251 | #ifdef CONFIG_X86 |
1252 | if (!acpi_ioapic) { |
1253 | /* compatible (0) means level (3) */ |
1254 | if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { |
1255 | acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; |
1256 | acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; |
1257 | } |
1258 | /* Set PIC-mode SCI trigger type */ |
1259 | acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, |
1260 | (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); |
1261 | } else { |
1262 | /* |
1263 | * now that acpi_gbl_FADT is initialized, |
1264 | * update it with result from INT_SRC_OVR parsing |
1265 | */ |
1266 | acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; |
1267 | } |
1268 | #endif |
1269 | return; |
1270 | |
1271 | error0: |
1272 | disable_acpi(); |
1273 | } |
1274 | |
1275 | /** |
1276 | * acpi_subsystem_init - Finalize the early initialization of ACPI. |
1277 | * |
1278 | * Switch over the platform to the ACPI mode (if possible). |
1279 | * |
1280 | * Doing this too early is generally unsafe, but at the same time it needs to be |
1281 | * done before all things that really depend on ACPI. The right spot appears to |
1282 | * be before finalizing the EFI initialization. |
1283 | */ |
1284 | void __init acpi_subsystem_init(void) |
1285 | { |
1286 | acpi_status status; |
1287 | |
1288 | if (acpi_disabled) |
1289 | return; |
1290 | |
1291 | status = acpi_enable_subsystem(flags: ~ACPI_NO_ACPI_ENABLE); |
1292 | if (ACPI_FAILURE(status)) { |
1293 | pr_err("Unable to enable ACPI\n" ); |
1294 | disable_acpi(); |
1295 | } else { |
1296 | /* |
1297 | * If the system is using ACPI then we can be reasonably |
1298 | * confident that any regulators are managed by the firmware |
1299 | * so tell the regulator core it has everything it needs to |
1300 | * know. |
1301 | */ |
1302 | regulator_has_full_constraints(); |
1303 | } |
1304 | } |
1305 | |
1306 | static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context) |
1307 | { |
1308 | if (event == ACPI_TABLE_EVENT_LOAD) |
1309 | acpi_scan_table_notify(); |
1310 | |
1311 | return acpi_sysfs_table_handler(event, table, context); |
1312 | } |
1313 | |
1314 | static int __init acpi_bus_init(void) |
1315 | { |
1316 | int result; |
1317 | acpi_status status; |
1318 | |
1319 | acpi_os_initialize1(); |
1320 | |
1321 | status = acpi_load_tables(); |
1322 | if (ACPI_FAILURE(status)) { |
1323 | pr_err("Unable to load the System Description Tables\n" ); |
1324 | goto error1; |
1325 | } |
1326 | |
1327 | /* |
1328 | * ACPI 2.0 requires the EC driver to be loaded and work before the EC |
1329 | * device is found in the namespace. |
1330 | * |
1331 | * This is accomplished by looking for the ECDT table and getting the EC |
1332 | * parameters out of that. |
1333 | * |
1334 | * Do that before calling acpi_initialize_objects() which may trigger EC |
1335 | * address space accesses. |
1336 | */ |
1337 | acpi_ec_ecdt_probe(); |
1338 | |
1339 | status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE); |
1340 | if (ACPI_FAILURE(status)) { |
1341 | pr_err("Unable to start the ACPI Interpreter\n" ); |
1342 | goto error1; |
1343 | } |
1344 | |
1345 | status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); |
1346 | if (ACPI_FAILURE(status)) { |
1347 | pr_err("Unable to initialize ACPI objects\n" ); |
1348 | goto error1; |
1349 | } |
1350 | |
1351 | /* |
1352 | * _OSC method may exist in module level code, |
1353 | * so it must be run after ACPI_FULL_INITIALIZATION |
1354 | */ |
1355 | acpi_bus_osc_negotiate_platform_control(); |
1356 | acpi_bus_osc_negotiate_usb_control(); |
1357 | |
1358 | /* |
1359 | * _PDC control method may load dynamic SSDT tables, |
1360 | * and we need to install the table handler before that. |
1361 | */ |
1362 | status = acpi_install_table_handler(handler: acpi_bus_table_handler, NULL); |
1363 | |
1364 | acpi_sysfs_init(); |
1365 | |
1366 | acpi_early_processor_control_setup(); |
1367 | |
1368 | /* |
1369 | * Maybe EC region is required at bus_scan/acpi_get_devices. So it |
1370 | * is necessary to enable it as early as possible. |
1371 | */ |
1372 | acpi_ec_dsdt_probe(); |
1373 | |
1374 | pr_info("Interpreter enabled\n" ); |
1375 | |
1376 | /* Initialize sleep structures */ |
1377 | acpi_sleep_init(); |
1378 | |
1379 | /* |
1380 | * Get the system interrupt model and evaluate \_PIC. |
1381 | */ |
1382 | result = acpi_bus_init_irq(); |
1383 | if (result) |
1384 | goto error1; |
1385 | |
1386 | /* |
1387 | * Register the for all standard device notifications. |
1388 | */ |
1389 | status = |
1390 | acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, |
1391 | handler: &acpi_bus_notify, NULL); |
1392 | if (ACPI_FAILURE(status)) { |
1393 | pr_err("Unable to register for system notifications\n" ); |
1394 | goto error1; |
1395 | } |
1396 | |
1397 | /* |
1398 | * Create the top ACPI proc directory |
1399 | */ |
1400 | acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); |
1401 | |
1402 | result = bus_register(bus: &acpi_bus_type); |
1403 | if (!result) |
1404 | return 0; |
1405 | |
1406 | /* Mimic structured exception handling */ |
1407 | error1: |
1408 | acpi_terminate(); |
1409 | return -ENODEV; |
1410 | } |
1411 | |
1412 | struct kobject *acpi_kobj; |
1413 | EXPORT_SYMBOL_GPL(acpi_kobj); |
1414 | |
1415 | static int __init acpi_init(void) |
1416 | { |
1417 | int result; |
1418 | |
1419 | if (acpi_disabled) { |
1420 | pr_info("Interpreter disabled.\n" ); |
1421 | return -ENODEV; |
1422 | } |
1423 | |
1424 | acpi_kobj = kobject_create_and_add(name: "acpi" , parent: firmware_kobj); |
1425 | if (!acpi_kobj) |
1426 | pr_debug("%s: kset create error\n" , __func__); |
1427 | |
1428 | init_prmt(); |
1429 | acpi_init_pcc(); |
1430 | result = acpi_bus_init(); |
1431 | if (result) { |
1432 | kobject_put(kobj: acpi_kobj); |
1433 | disable_acpi(); |
1434 | return result; |
1435 | } |
1436 | acpi_init_ffh(); |
1437 | |
1438 | pci_mmcfg_late_init(); |
1439 | acpi_viot_early_init(); |
1440 | acpi_hest_init(); |
1441 | acpi_ghes_init(); |
1442 | acpi_arm_init(); |
1443 | acpi_scan_init(); |
1444 | acpi_ec_init(); |
1445 | acpi_debugfs_init(); |
1446 | acpi_sleep_proc_init(); |
1447 | acpi_wakeup_device_init(); |
1448 | acpi_debugger_init(); |
1449 | acpi_setup_sb_notify_handler(); |
1450 | acpi_viot_init(); |
1451 | return 0; |
1452 | } |
1453 | |
1454 | subsys_initcall(acpi_init); |
1455 | |