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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
0004  *
0005  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
0006  */
0007 
0008 #define pr_fmt(fmt) "ACPI: " fmt
0009 
0010 #include <linux/module.h>
0011 #include <linux/init.h>
0012 #include <linux/ioport.h>
0013 #include <linux/kernel.h>
0014 #include <linux/list.h>
0015 #include <linux/sched.h>
0016 #include <linux/pm.h>
0017 #include <linux/device.h>
0018 #include <linux/proc_fs.h>
0019 #include <linux/acpi.h>
0020 #include <linux/slab.h>
0021 #include <linux/regulator/machine.h>
0022 #include <linux/workqueue.h>
0023 #include <linux/reboot.h>
0024 #include <linux/delay.h>
0025 #ifdef CONFIG_X86
0026 #include <asm/mpspec.h>
0027 #include <linux/dmi.h>
0028 #endif
0029 #include <linux/acpi_agdi.h>
0030 #include <linux/acpi_iort.h>
0031 #include <linux/acpi_viot.h>
0032 #include <linux/pci.h>
0033 #include <acpi/apei.h>
0034 #include <linux/suspend.h>
0035 #include <linux/prmt.h>
0036 
0037 #include "internal.h"
0038 
0039 struct acpi_device *acpi_root;
0040 struct proc_dir_entry *acpi_root_dir;
0041 EXPORT_SYMBOL(acpi_root_dir);
0042 
0043 #ifdef CONFIG_X86
0044 #ifdef CONFIG_ACPI_CUSTOM_DSDT
0045 static inline int set_copy_dsdt(const struct dmi_system_id *id)
0046 {
0047     return 0;
0048 }
0049 #else
0050 static int set_copy_dsdt(const struct dmi_system_id *id)
0051 {
0052     pr_notice("%s detected - force copy of DSDT to local memory\n", id->ident);
0053     acpi_gbl_copy_dsdt_locally = 1;
0054     return 0;
0055 }
0056 #endif
0057 
0058 static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
0059     /*
0060      * Invoke DSDT corruption work-around on all Toshiba Satellite.
0061      * https://bugzilla.kernel.org/show_bug.cgi?id=14679
0062      */
0063     {
0064      .callback = set_copy_dsdt,
0065      .ident = "TOSHIBA Satellite",
0066      .matches = {
0067         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
0068         DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
0069         },
0070     },
0071     {}
0072 };
0073 #endif
0074 
0075 /* --------------------------------------------------------------------------
0076                                 Device Management
0077    -------------------------------------------------------------------------- */
0078 
0079 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
0080                        unsigned long long *sta)
0081 {
0082     acpi_status status;
0083 
0084     status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
0085     if (ACPI_SUCCESS(status))
0086         return AE_OK;
0087 
0088     if (status == AE_NOT_FOUND) {
0089         *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
0090                ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
0091         return AE_OK;
0092     }
0093     return status;
0094 }
0095 EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
0096 
0097 int acpi_bus_get_status(struct acpi_device *device)
0098 {
0099     acpi_status status;
0100     unsigned long long sta;
0101 
0102     if (acpi_device_override_status(device, &sta)) {
0103         acpi_set_device_status(device, sta);
0104         return 0;
0105     }
0106 
0107     /* Battery devices must have their deps met before calling _STA */
0108     if (acpi_device_is_battery(device) && device->dep_unmet) {
0109         acpi_set_device_status(device, 0);
0110         return 0;
0111     }
0112 
0113     status = acpi_bus_get_status_handle(device->handle, &sta);
0114     if (ACPI_FAILURE(status))
0115         return -ENODEV;
0116 
0117     acpi_set_device_status(device, sta);
0118 
0119     if (device->status.functional && !device->status.present) {
0120         pr_debug("Device [%s] status [%08x]: functional but not present\n",
0121              device->pnp.bus_id, (u32)sta);
0122     }
0123 
0124     pr_debug("Device [%s] status [%08x]\n", device->pnp.bus_id, (u32)sta);
0125     return 0;
0126 }
0127 EXPORT_SYMBOL(acpi_bus_get_status);
0128 
0129 void acpi_bus_private_data_handler(acpi_handle handle,
0130                    void *context)
0131 {
0132     return;
0133 }
0134 EXPORT_SYMBOL(acpi_bus_private_data_handler);
0135 
0136 int acpi_bus_attach_private_data(acpi_handle handle, void *data)
0137 {
0138     acpi_status status;
0139 
0140     status = acpi_attach_data(handle,
0141             acpi_bus_private_data_handler, data);
0142     if (ACPI_FAILURE(status)) {
0143         acpi_handle_debug(handle, "Error attaching device data\n");
0144         return -ENODEV;
0145     }
0146 
0147     return 0;
0148 }
0149 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
0150 
0151 int acpi_bus_get_private_data(acpi_handle handle, void **data)
0152 {
0153     acpi_status status;
0154 
0155     if (!data)
0156         return -EINVAL;
0157 
0158     status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
0159     if (ACPI_FAILURE(status)) {
0160         acpi_handle_debug(handle, "No context for object\n");
0161         return -ENODEV;
0162     }
0163 
0164     return 0;
0165 }
0166 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
0167 
0168 void acpi_bus_detach_private_data(acpi_handle handle)
0169 {
0170     acpi_detach_data(handle, acpi_bus_private_data_handler);
0171 }
0172 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
0173 
0174 static void acpi_print_osc_error(acpi_handle handle,
0175                  struct acpi_osc_context *context, char *error)
0176 {
0177     int i;
0178 
0179     acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
0180 
0181     pr_debug("_OSC request data:");
0182     for (i = 0; i < context->cap.length; i += sizeof(u32))
0183         pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
0184 
0185     pr_debug("\n");
0186 }
0187 
0188 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
0189 {
0190     acpi_status status;
0191     struct acpi_object_list input;
0192     union acpi_object in_params[4];
0193     union acpi_object *out_obj;
0194     guid_t guid;
0195     u32 errors;
0196     struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
0197 
0198     if (!context)
0199         return AE_ERROR;
0200     if (guid_parse(context->uuid_str, &guid))
0201         return AE_ERROR;
0202     context->ret.length = ACPI_ALLOCATE_BUFFER;
0203     context->ret.pointer = NULL;
0204 
0205     /* Setting up input parameters */
0206     input.count = 4;
0207     input.pointer = in_params;
0208     in_params[0].type       = ACPI_TYPE_BUFFER;
0209     in_params[0].buffer.length  = 16;
0210     in_params[0].buffer.pointer = (u8 *)&guid;
0211     in_params[1].type       = ACPI_TYPE_INTEGER;
0212     in_params[1].integer.value  = context->rev;
0213     in_params[2].type       = ACPI_TYPE_INTEGER;
0214     in_params[2].integer.value  = context->cap.length/sizeof(u32);
0215     in_params[3].type       = ACPI_TYPE_BUFFER;
0216     in_params[3].buffer.length  = context->cap.length;
0217     in_params[3].buffer.pointer     = context->cap.pointer;
0218 
0219     status = acpi_evaluate_object(handle, "_OSC", &input, &output);
0220     if (ACPI_FAILURE(status))
0221         return status;
0222 
0223     if (!output.length)
0224         return AE_NULL_OBJECT;
0225 
0226     out_obj = output.pointer;
0227     if (out_obj->type != ACPI_TYPE_BUFFER
0228         || out_obj->buffer.length != context->cap.length) {
0229         acpi_print_osc_error(handle, context,
0230             "_OSC evaluation returned wrong type");
0231         status = AE_TYPE;
0232         goto out_kfree;
0233     }
0234     /* Need to ignore the bit0 in result code */
0235     errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
0236     if (errors) {
0237         if (errors & OSC_REQUEST_ERROR)
0238             acpi_print_osc_error(handle, context,
0239                 "_OSC request failed");
0240         if (errors & OSC_INVALID_UUID_ERROR)
0241             acpi_print_osc_error(handle, context,
0242                 "_OSC invalid UUID");
0243         if (errors & OSC_INVALID_REVISION_ERROR)
0244             acpi_print_osc_error(handle, context,
0245                 "_OSC invalid revision");
0246         if (errors & OSC_CAPABILITIES_MASK_ERROR) {
0247             if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
0248                 & OSC_QUERY_ENABLE)
0249                 goto out_success;
0250             status = AE_SUPPORT;
0251             goto out_kfree;
0252         }
0253         status = AE_ERROR;
0254         goto out_kfree;
0255     }
0256 out_success:
0257     context->ret.length = out_obj->buffer.length;
0258     context->ret.pointer = kmemdup(out_obj->buffer.pointer,
0259                        context->ret.length, GFP_KERNEL);
0260     if (!context->ret.pointer) {
0261         status =  AE_NO_MEMORY;
0262         goto out_kfree;
0263     }
0264     status =  AE_OK;
0265 
0266 out_kfree:
0267     kfree(output.pointer);
0268     return status;
0269 }
0270 EXPORT_SYMBOL(acpi_run_osc);
0271 
0272 bool osc_sb_apei_support_acked;
0273 
0274 /*
0275  * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
0276  * OSPM supports platform coordinated low power idle(LPI) states
0277  */
0278 bool osc_pc_lpi_support_confirmed;
0279 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
0280 
0281 /*
0282  * ACPI 6.2 Section 6.2.11.2 'Platform-Wide OSPM Capabilities':
0283  *   Starting with ACPI Specification 6.2, all _CPC registers can be in
0284  *   PCC, System Memory, System IO, or Functional Fixed Hardware address
0285  *   spaces. OSPM support for this more flexible register space scheme is
0286  *   indicated by the “Flexible Address Space for CPPC Registers” _OSC bit.
0287  *
0288  * Otherwise (cf ACPI 6.1, s8.4.7.1.1.X), _CPC registers must be in:
0289  * - PCC or Functional Fixed Hardware address space if defined
0290  * - SystemMemory address space (NULL register) if not defined
0291  */
0292 bool osc_cpc_flexible_adr_space_confirmed;
0293 EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed);
0294 
0295 /*
0296  * ACPI 6.4 Operating System Capabilities for USB.
0297  */
0298 bool osc_sb_native_usb4_support_confirmed;
0299 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
0300 
0301 bool osc_sb_cppc2_support_acked;
0302 
0303 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
0304 static void acpi_bus_osc_negotiate_platform_control(void)
0305 {
0306     u32 capbuf[2], *capbuf_ret;
0307     struct acpi_osc_context context = {
0308         .uuid_str = sb_uuid_str,
0309         .rev = 1,
0310         .cap.length = 8,
0311         .cap.pointer = capbuf,
0312     };
0313     acpi_handle handle;
0314 
0315     capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
0316     capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
0317     if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
0318         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
0319     if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
0320         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
0321 
0322     capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
0323     capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
0324     if (IS_ENABLED(CONFIG_ACPI_PRMT))
0325         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT;
0326 
0327 #ifdef CONFIG_ARM64
0328     capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
0329 #endif
0330 #ifdef CONFIG_X86
0331     capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
0332 #endif
0333 
0334 #ifdef CONFIG_ACPI_CPPC_LIB
0335     capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
0336     capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
0337 #endif
0338 
0339     capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
0340 
0341     if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
0342         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
0343 
0344     if (IS_ENABLED(CONFIG_USB4))
0345         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT;
0346 
0347     if (!ghes_disable)
0348         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
0349     if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
0350         return;
0351 
0352     if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
0353         return;
0354 
0355     capbuf_ret = context.ret.pointer;
0356     if (context.ret.length <= OSC_SUPPORT_DWORD) {
0357         kfree(context.ret.pointer);
0358         return;
0359     }
0360 
0361     /*
0362      * Now run _OSC again with query flag clear and with the caps
0363      * supported by both the OS and the platform.
0364      */
0365     capbuf[OSC_QUERY_DWORD] = 0;
0366     capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD];
0367     kfree(context.ret.pointer);
0368 
0369     if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
0370         return;
0371 
0372     capbuf_ret = context.ret.pointer;
0373     if (context.ret.length > OSC_SUPPORT_DWORD) {
0374 #ifdef CONFIG_ACPI_CPPC_LIB
0375         osc_sb_cppc2_support_acked = capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPCV2_SUPPORT;
0376 #endif
0377 
0378         osc_sb_apei_support_acked =
0379             capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
0380         osc_pc_lpi_support_confirmed =
0381             capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
0382         osc_sb_native_usb4_support_confirmed =
0383             capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT;
0384         osc_cpc_flexible_adr_space_confirmed =
0385             capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
0386     }
0387 
0388     kfree(context.ret.pointer);
0389 }
0390 
0391 /*
0392  * Native control of USB4 capabilities. If any of the tunneling bits is
0393  * set it means OS is in control and we use software based connection
0394  * manager.
0395  */
0396 u32 osc_sb_native_usb4_control;
0397 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
0398 
0399 static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)
0400 {
0401     pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,
0402            (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',
0403            (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',
0404            (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',
0405            (bits & OSC_USB_XDOMAIN) ? '+' : '-');
0406 }
0407 
0408 static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
0409 static void acpi_bus_osc_negotiate_usb_control(void)
0410 {
0411     u32 capbuf[3];
0412     struct acpi_osc_context context = {
0413         .uuid_str = sb_usb_uuid_str,
0414         .rev = 1,
0415         .cap.length = sizeof(capbuf),
0416         .cap.pointer = capbuf,
0417     };
0418     acpi_handle handle;
0419     acpi_status status;
0420     u32 control;
0421 
0422     if (!osc_sb_native_usb4_support_confirmed)
0423         return;
0424 
0425     if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
0426         return;
0427 
0428     control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |
0429           OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;
0430 
0431     capbuf[OSC_QUERY_DWORD] = 0;
0432     capbuf[OSC_SUPPORT_DWORD] = 0;
0433     capbuf[OSC_CONTROL_DWORD] = control;
0434 
0435     status = acpi_run_osc(handle, &context);
0436     if (ACPI_FAILURE(status))
0437         return;
0438 
0439     if (context.ret.length != sizeof(capbuf)) {
0440         pr_info("USB4 _OSC: returned invalid length buffer\n");
0441         goto out_free;
0442     }
0443 
0444     osc_sb_native_usb4_control =
0445         control &  acpi_osc_ctx_get_pci_control(&context);
0446 
0447     acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
0448     acpi_bus_decode_usb_osc("USB4 _OSC: OS controls",
0449                 osc_sb_native_usb4_control);
0450 
0451 out_free:
0452     kfree(context.ret.pointer);
0453 }
0454 
0455 /* --------------------------------------------------------------------------
0456                              Notification Handling
0457    -------------------------------------------------------------------------- */
0458 
0459 /**
0460  * acpi_bus_notify
0461  * ---------------
0462  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
0463  */
0464 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
0465 {
0466     struct acpi_device *adev;
0467     u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
0468     bool hotplug_event = false;
0469 
0470     switch (type) {
0471     case ACPI_NOTIFY_BUS_CHECK:
0472         acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
0473         hotplug_event = true;
0474         break;
0475 
0476     case ACPI_NOTIFY_DEVICE_CHECK:
0477         acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
0478         hotplug_event = true;
0479         break;
0480 
0481     case ACPI_NOTIFY_DEVICE_WAKE:
0482         acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
0483         break;
0484 
0485     case ACPI_NOTIFY_EJECT_REQUEST:
0486         acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
0487         hotplug_event = true;
0488         break;
0489 
0490     case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
0491         acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
0492         /* TBD: Exactly what does 'light' mean? */
0493         break;
0494 
0495     case ACPI_NOTIFY_FREQUENCY_MISMATCH:
0496         acpi_handle_err(handle, "Device cannot be configured due "
0497                 "to a frequency mismatch\n");
0498         break;
0499 
0500     case ACPI_NOTIFY_BUS_MODE_MISMATCH:
0501         acpi_handle_err(handle, "Device cannot be configured due "
0502                 "to a bus mode mismatch\n");
0503         break;
0504 
0505     case ACPI_NOTIFY_POWER_FAULT:
0506         acpi_handle_err(handle, "Device has suffered a power fault\n");
0507         break;
0508 
0509     default:
0510         acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
0511         break;
0512     }
0513 
0514     adev = acpi_bus_get_acpi_device(handle);
0515     if (!adev)
0516         goto err;
0517 
0518     if (adev->dev.driver) {
0519         struct acpi_driver *driver = to_acpi_driver(adev->dev.driver);
0520 
0521         if (driver && driver->ops.notify &&
0522             (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
0523             driver->ops.notify(adev, type);
0524     }
0525 
0526     if (!hotplug_event) {
0527         acpi_bus_put_acpi_device(adev);
0528         return;
0529     }
0530 
0531     if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
0532         return;
0533 
0534     acpi_bus_put_acpi_device(adev);
0535 
0536  err:
0537     acpi_evaluate_ost(handle, type, ost_code, NULL);
0538 }
0539 
0540 static void acpi_notify_device(acpi_handle handle, u32 event, void *data)
0541 {
0542     struct acpi_device *device = data;
0543     struct acpi_driver *acpi_drv = to_acpi_driver(device->dev.driver);
0544 
0545     acpi_drv->ops.notify(device, event);
0546 }
0547 
0548 static void acpi_notify_device_fixed(void *data)
0549 {
0550     struct acpi_device *device = data;
0551 
0552     /* Fixed hardware devices have no handles */
0553     acpi_notify_device(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
0554 }
0555 
0556 static u32 acpi_device_fixed_event(void *data)
0557 {
0558     acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_notify_device_fixed, data);
0559     return ACPI_INTERRUPT_HANDLED;
0560 }
0561 
0562 static int acpi_device_install_notify_handler(struct acpi_device *device)
0563 {
0564     acpi_status status;
0565 
0566     if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
0567         status =
0568             acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
0569                              acpi_device_fixed_event,
0570                              device);
0571     else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
0572         status =
0573             acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
0574                              acpi_device_fixed_event,
0575                              device);
0576     else
0577         status = acpi_install_notify_handler(device->handle,
0578                              ACPI_DEVICE_NOTIFY,
0579                              acpi_notify_device,
0580                              device);
0581 
0582     if (ACPI_FAILURE(status))
0583         return -EINVAL;
0584     return 0;
0585 }
0586 
0587 static void acpi_device_remove_notify_handler(struct acpi_device *device)
0588 {
0589     if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
0590         acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
0591                         acpi_device_fixed_event);
0592     else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
0593         acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
0594                         acpi_device_fixed_event);
0595     else
0596         acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
0597                        acpi_notify_device);
0598 }
0599 
0600 /* Handle events targeting \_SB device (at present only graceful shutdown) */
0601 
0602 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
0603 #define ACPI_SB_INDICATE_INTERVAL   10000
0604 
0605 static void sb_notify_work(struct work_struct *dummy)
0606 {
0607     acpi_handle sb_handle;
0608 
0609     orderly_poweroff(true);
0610 
0611     /*
0612      * After initiating graceful shutdown, the ACPI spec requires OSPM
0613      * to evaluate _OST method once every 10seconds to indicate that
0614      * the shutdown is in progress
0615      */
0616     acpi_get_handle(NULL, "\\_SB", &sb_handle);
0617     while (1) {
0618         pr_info("Graceful shutdown in progress.\n");
0619         acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
0620                 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
0621         msleep(ACPI_SB_INDICATE_INTERVAL);
0622     }
0623 }
0624 
0625 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
0626 {
0627     static DECLARE_WORK(acpi_sb_work, sb_notify_work);
0628 
0629     if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
0630         if (!work_busy(&acpi_sb_work))
0631             schedule_work(&acpi_sb_work);
0632     } else
0633         pr_warn("event %x is not supported by \\_SB device\n", event);
0634 }
0635 
0636 static int __init acpi_setup_sb_notify_handler(void)
0637 {
0638     acpi_handle sb_handle;
0639 
0640     if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
0641         return -ENXIO;
0642 
0643     if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
0644                         acpi_sb_notify, NULL)))
0645         return -EINVAL;
0646 
0647     return 0;
0648 }
0649 
0650 /* --------------------------------------------------------------------------
0651                              Device Matching
0652    -------------------------------------------------------------------------- */
0653 
0654 /**
0655  * acpi_get_first_physical_node - Get first physical node of an ACPI device
0656  * @adev:   ACPI device in question
0657  *
0658  * Return: First physical node of ACPI device @adev
0659  */
0660 struct device *acpi_get_first_physical_node(struct acpi_device *adev)
0661 {
0662     struct mutex *physical_node_lock = &adev->physical_node_lock;
0663     struct device *phys_dev;
0664 
0665     mutex_lock(physical_node_lock);
0666     if (list_empty(&adev->physical_node_list)) {
0667         phys_dev = NULL;
0668     } else {
0669         const struct acpi_device_physical_node *node;
0670 
0671         node = list_first_entry(&adev->physical_node_list,
0672                     struct acpi_device_physical_node, node);
0673 
0674         phys_dev = node->dev;
0675     }
0676     mutex_unlock(physical_node_lock);
0677     return phys_dev;
0678 }
0679 EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
0680 
0681 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
0682                               const struct device *dev)
0683 {
0684     const struct device *phys_dev = acpi_get_first_physical_node(adev);
0685 
0686     return phys_dev && phys_dev == dev ? adev : NULL;
0687 }
0688 
0689 /**
0690  * acpi_device_is_first_physical_node - Is given dev first physical node
0691  * @adev: ACPI companion device
0692  * @dev: Physical device to check
0693  *
0694  * Function checks if given @dev is the first physical devices attached to
0695  * the ACPI companion device. This distinction is needed in some cases
0696  * where the same companion device is shared between many physical devices.
0697  *
0698  * Note that the caller have to provide valid @adev pointer.
0699  */
0700 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
0701                     const struct device *dev)
0702 {
0703     return !!acpi_primary_dev_companion(adev, dev);
0704 }
0705 
0706 /*
0707  * acpi_companion_match() - Can we match via ACPI companion device
0708  * @dev: Device in question
0709  *
0710  * Check if the given device has an ACPI companion and if that companion has
0711  * a valid list of PNP IDs, and if the device is the first (primary) physical
0712  * device associated with it.  Return the companion pointer if that's the case
0713  * or NULL otherwise.
0714  *
0715  * If multiple physical devices are attached to a single ACPI companion, we need
0716  * to be careful.  The usage scenario for this kind of relationship is that all
0717  * of the physical devices in question use resources provided by the ACPI
0718  * companion.  A typical case is an MFD device where all the sub-devices share
0719  * the parent's ACPI companion.  In such cases we can only allow the primary
0720  * (first) physical device to be matched with the help of the companion's PNP
0721  * IDs.
0722  *
0723  * Additional physical devices sharing the ACPI companion can still use
0724  * resources available from it but they will be matched normally using functions
0725  * provided by their bus types (and analogously for their modalias).
0726  */
0727 struct acpi_device *acpi_companion_match(const struct device *dev)
0728 {
0729     struct acpi_device *adev;
0730 
0731     adev = ACPI_COMPANION(dev);
0732     if (!adev)
0733         return NULL;
0734 
0735     if (list_empty(&adev->pnp.ids))
0736         return NULL;
0737 
0738     return acpi_primary_dev_companion(adev, dev);
0739 }
0740 
0741 /**
0742  * acpi_of_match_device - Match device object using the "compatible" property.
0743  * @adev: ACPI device object to match.
0744  * @of_match_table: List of device IDs to match against.
0745  * @of_id: OF ID if matched
0746  *
0747  * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
0748  * identifiers and a _DSD object with the "compatible" property, use that
0749  * property to match against the given list of identifiers.
0750  */
0751 static bool acpi_of_match_device(struct acpi_device *adev,
0752                  const struct of_device_id *of_match_table,
0753                  const struct of_device_id **of_id)
0754 {
0755     const union acpi_object *of_compatible, *obj;
0756     int i, nval;
0757 
0758     if (!adev)
0759         return false;
0760 
0761     of_compatible = adev->data.of_compatible;
0762     if (!of_match_table || !of_compatible)
0763         return false;
0764 
0765     if (of_compatible->type == ACPI_TYPE_PACKAGE) {
0766         nval = of_compatible->package.count;
0767         obj = of_compatible->package.elements;
0768     } else { /* Must be ACPI_TYPE_STRING. */
0769         nval = 1;
0770         obj = of_compatible;
0771     }
0772     /* Now we can look for the driver DT compatible strings */
0773     for (i = 0; i < nval; i++, obj++) {
0774         const struct of_device_id *id;
0775 
0776         for (id = of_match_table; id->compatible[0]; id++)
0777             if (!strcasecmp(obj->string.pointer, id->compatible)) {
0778                 if (of_id)
0779                     *of_id = id;
0780                 return true;
0781             }
0782     }
0783 
0784     return false;
0785 }
0786 
0787 static bool acpi_of_modalias(struct acpi_device *adev,
0788                  char *modalias, size_t len)
0789 {
0790     const union acpi_object *of_compatible;
0791     const union acpi_object *obj;
0792     const char *str, *chr;
0793 
0794     of_compatible = adev->data.of_compatible;
0795     if (!of_compatible)
0796         return false;
0797 
0798     if (of_compatible->type == ACPI_TYPE_PACKAGE)
0799         obj = of_compatible->package.elements;
0800     else /* Must be ACPI_TYPE_STRING. */
0801         obj = of_compatible;
0802 
0803     str = obj->string.pointer;
0804     chr = strchr(str, ',');
0805     strlcpy(modalias, chr ? chr + 1 : str, len);
0806 
0807     return true;
0808 }
0809 
0810 /**
0811  * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
0812  * @adev:   ACPI device object to match
0813  * @default_id: ID string to use as default if no compatible string found
0814  * @modalias:   Pointer to buffer that modalias value will be copied into
0815  * @len:    Length of modalias buffer
0816  *
0817  * This is a counterpart of of_modalias_node() for struct acpi_device objects.
0818  * If there is a compatible string for @adev, it will be copied to @modalias
0819  * with the vendor prefix stripped; otherwise, @default_id will be used.
0820  */
0821 void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
0822                char *modalias, size_t len)
0823 {
0824     if (!acpi_of_modalias(adev, modalias, len))
0825         strlcpy(modalias, default_id, len);
0826 }
0827 EXPORT_SYMBOL_GPL(acpi_set_modalias);
0828 
0829 static bool __acpi_match_device_cls(const struct acpi_device_id *id,
0830                     struct acpi_hardware_id *hwid)
0831 {
0832     int i, msk, byte_shift;
0833     char buf[3];
0834 
0835     if (!id->cls)
0836         return false;
0837 
0838     /* Apply class-code bitmask, before checking each class-code byte */
0839     for (i = 1; i <= 3; i++) {
0840         byte_shift = 8 * (3 - i);
0841         msk = (id->cls_msk >> byte_shift) & 0xFF;
0842         if (!msk)
0843             continue;
0844 
0845         sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
0846         if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
0847             return false;
0848     }
0849     return true;
0850 }
0851 
0852 static bool __acpi_match_device(struct acpi_device *device,
0853                 const struct acpi_device_id *acpi_ids,
0854                 const struct of_device_id *of_ids,
0855                 const struct acpi_device_id **acpi_id,
0856                 const struct of_device_id **of_id)
0857 {
0858     const struct acpi_device_id *id;
0859     struct acpi_hardware_id *hwid;
0860 
0861     /*
0862      * If the device is not present, it is unnecessary to load device
0863      * driver for it.
0864      */
0865     if (!device || !device->status.present)
0866         return false;
0867 
0868     list_for_each_entry(hwid, &device->pnp.ids, list) {
0869         /* First, check the ACPI/PNP IDs provided by the caller. */
0870         if (acpi_ids) {
0871             for (id = acpi_ids; id->id[0] || id->cls; id++) {
0872                 if (id->id[0] && !strcmp((char *)id->id, hwid->id))
0873                     goto out_acpi_match;
0874                 if (id->cls && __acpi_match_device_cls(id, hwid))
0875                     goto out_acpi_match;
0876             }
0877         }
0878 
0879         /*
0880          * Next, check ACPI_DT_NAMESPACE_HID and try to match the
0881          * "compatible" property if found.
0882          */
0883         if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
0884             return acpi_of_match_device(device, of_ids, of_id);
0885     }
0886     return false;
0887 
0888 out_acpi_match:
0889     if (acpi_id)
0890         *acpi_id = id;
0891     return true;
0892 }
0893 
0894 /**
0895  * acpi_match_device - Match a struct device against a given list of ACPI IDs
0896  * @ids: Array of struct acpi_device_id object to match against.
0897  * @dev: The device structure to match.
0898  *
0899  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
0900  * object for that handle and use that object to match against a given list of
0901  * device IDs.
0902  *
0903  * Return a pointer to the first matching ID on success or %NULL on failure.
0904  */
0905 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
0906                            const struct device *dev)
0907 {
0908     const struct acpi_device_id *id = NULL;
0909 
0910     __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL);
0911     return id;
0912 }
0913 EXPORT_SYMBOL_GPL(acpi_match_device);
0914 
0915 static const void *acpi_of_device_get_match_data(const struct device *dev)
0916 {
0917     struct acpi_device *adev = ACPI_COMPANION(dev);
0918     const struct of_device_id *match = NULL;
0919 
0920     if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
0921         return NULL;
0922 
0923     return match->data;
0924 }
0925 
0926 const void *acpi_device_get_match_data(const struct device *dev)
0927 {
0928     const struct acpi_device_id *match;
0929 
0930     if (!dev->driver->acpi_match_table)
0931         return acpi_of_device_get_match_data(dev);
0932 
0933     match = acpi_match_device(dev->driver->acpi_match_table, dev);
0934     if (!match)
0935         return NULL;
0936 
0937     return (const void *)match->driver_data;
0938 }
0939 EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
0940 
0941 int acpi_match_device_ids(struct acpi_device *device,
0942               const struct acpi_device_id *ids)
0943 {
0944     return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
0945 }
0946 EXPORT_SYMBOL(acpi_match_device_ids);
0947 
0948 bool acpi_driver_match_device(struct device *dev,
0949                   const struct device_driver *drv)
0950 {
0951     if (!drv->acpi_match_table)
0952         return acpi_of_match_device(ACPI_COMPANION(dev),
0953                         drv->of_match_table,
0954                         NULL);
0955 
0956     return __acpi_match_device(acpi_companion_match(dev),
0957                    drv->acpi_match_table, drv->of_match_table,
0958                    NULL, NULL);
0959 }
0960 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
0961 
0962 /* --------------------------------------------------------------------------
0963                               ACPI Driver Management
0964    -------------------------------------------------------------------------- */
0965 
0966 /**
0967  * acpi_bus_register_driver - register a driver with the ACPI bus
0968  * @driver: driver being registered
0969  *
0970  * Registers a driver with the ACPI bus.  Searches the namespace for all
0971  * devices that match the driver's criteria and binds.  Returns zero for
0972  * success or a negative error status for failure.
0973  */
0974 int acpi_bus_register_driver(struct acpi_driver *driver)
0975 {
0976     int ret;
0977 
0978     if (acpi_disabled)
0979         return -ENODEV;
0980     driver->drv.name = driver->name;
0981     driver->drv.bus = &acpi_bus_type;
0982     driver->drv.owner = driver->owner;
0983 
0984     ret = driver_register(&driver->drv);
0985     return ret;
0986 }
0987 
0988 EXPORT_SYMBOL(acpi_bus_register_driver);
0989 
0990 /**
0991  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
0992  * @driver: driver to unregister
0993  *
0994  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
0995  * devices that match the driver's criteria and unbinds.
0996  */
0997 void acpi_bus_unregister_driver(struct acpi_driver *driver)
0998 {
0999     driver_unregister(&driver->drv);
1000 }
1001 
1002 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1003 
1004 /* --------------------------------------------------------------------------
1005                               ACPI Bus operations
1006    -------------------------------------------------------------------------- */
1007 
1008 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
1009 {
1010     struct acpi_device *acpi_dev = to_acpi_device(dev);
1011     struct acpi_driver *acpi_drv = to_acpi_driver(drv);
1012 
1013     return acpi_dev->flags.match_driver
1014         && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
1015 }
1016 
1017 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
1018 {
1019     return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
1020 }
1021 
1022 static int acpi_device_probe(struct device *dev)
1023 {
1024     struct acpi_device *acpi_dev = to_acpi_device(dev);
1025     struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1026     int ret;
1027 
1028     if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1029         return -EINVAL;
1030 
1031     if (!acpi_drv->ops.add)
1032         return -ENOSYS;
1033 
1034     ret = acpi_drv->ops.add(acpi_dev);
1035     if (ret)
1036         return ret;
1037 
1038     pr_debug("Driver [%s] successfully bound to device [%s]\n",
1039          acpi_drv->name, acpi_dev->pnp.bus_id);
1040 
1041     if (acpi_drv->ops.notify) {
1042         ret = acpi_device_install_notify_handler(acpi_dev);
1043         if (ret) {
1044             if (acpi_drv->ops.remove)
1045                 acpi_drv->ops.remove(acpi_dev);
1046 
1047             acpi_dev->driver_data = NULL;
1048             return ret;
1049         }
1050     }
1051 
1052     pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name,
1053          acpi_dev->pnp.bus_id);
1054 
1055     get_device(dev);
1056     return 0;
1057 }
1058 
1059 static void acpi_device_remove(struct device *dev)
1060 {
1061     struct acpi_device *acpi_dev = to_acpi_device(dev);
1062     struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1063 
1064     if (acpi_drv->ops.notify)
1065         acpi_device_remove_notify_handler(acpi_dev);
1066 
1067     if (acpi_drv->ops.remove)
1068         acpi_drv->ops.remove(acpi_dev);
1069 
1070     acpi_dev->driver_data = NULL;
1071 
1072     put_device(dev);
1073 }
1074 
1075 struct bus_type acpi_bus_type = {
1076     .name       = "acpi",
1077     .match      = acpi_bus_match,
1078     .probe      = acpi_device_probe,
1079     .remove     = acpi_device_remove,
1080     .uevent     = acpi_device_uevent,
1081 };
1082 
1083 int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data)
1084 {
1085     return bus_for_each_dev(&acpi_bus_type, NULL, data, fn);
1086 }
1087 EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev);
1088 
1089 struct acpi_dev_walk_context {
1090     int (*fn)(struct acpi_device *, void *);
1091     void *data;
1092 };
1093 
1094 static int acpi_dev_for_one_check(struct device *dev, void *context)
1095 {
1096     struct acpi_dev_walk_context *adwc = context;
1097 
1098     if (dev->bus != &acpi_bus_type)
1099         return 0;
1100 
1101     return adwc->fn(to_acpi_device(dev), adwc->data);
1102 }
1103 EXPORT_SYMBOL_GPL(acpi_dev_for_each_child);
1104 
1105 int acpi_dev_for_each_child(struct acpi_device *adev,
1106                 int (*fn)(struct acpi_device *, void *), void *data)
1107 {
1108     struct acpi_dev_walk_context adwc = {
1109         .fn = fn,
1110         .data = data,
1111     };
1112 
1113     return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check);
1114 }
1115 
1116 int acpi_dev_for_each_child_reverse(struct acpi_device *adev,
1117                     int (*fn)(struct acpi_device *, void *),
1118                     void *data)
1119 {
1120     struct acpi_dev_walk_context adwc = {
1121         .fn = fn,
1122         .data = data,
1123     };
1124 
1125     return device_for_each_child_reverse(&adev->dev, &adwc, acpi_dev_for_one_check);
1126 }
1127 
1128 /* --------------------------------------------------------------------------
1129                              Initialization/Cleanup
1130    -------------------------------------------------------------------------- */
1131 
1132 static int __init acpi_bus_init_irq(void)
1133 {
1134     acpi_status status;
1135     char *message = NULL;
1136 
1137 
1138     /*
1139      * Let the system know what interrupt model we are using by
1140      * evaluating the \_PIC object, if exists.
1141      */
1142 
1143     switch (acpi_irq_model) {
1144     case ACPI_IRQ_MODEL_PIC:
1145         message = "PIC";
1146         break;
1147     case ACPI_IRQ_MODEL_IOAPIC:
1148         message = "IOAPIC";
1149         break;
1150     case ACPI_IRQ_MODEL_IOSAPIC:
1151         message = "IOSAPIC";
1152         break;
1153     case ACPI_IRQ_MODEL_GIC:
1154         message = "GIC";
1155         break;
1156     case ACPI_IRQ_MODEL_PLATFORM:
1157         message = "platform specific model";
1158         break;
1159     case ACPI_IRQ_MODEL_LPIC:
1160         message = "LPIC";
1161         break;
1162     default:
1163         pr_info("Unknown interrupt routing model\n");
1164         return -ENODEV;
1165     }
1166 
1167     pr_info("Using %s for interrupt routing\n", message);
1168 
1169     status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1170     if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1171         pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status));
1172         return -ENODEV;
1173     }
1174 
1175     return 0;
1176 }
1177 
1178 /**
1179  * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1180  *
1181  * The ACPI tables are accessible after this, but the handling of events has not
1182  * been initialized and the global lock is not available yet, so AML should not
1183  * be executed at this point.
1184  *
1185  * Doing this before switching the EFI runtime services to virtual mode allows
1186  * the EfiBootServices memory to be freed slightly earlier on boot.
1187  */
1188 void __init acpi_early_init(void)
1189 {
1190     acpi_status status;
1191 
1192     if (acpi_disabled)
1193         return;
1194 
1195     pr_info("Core revision %08x\n", ACPI_CA_VERSION);
1196 
1197     /* enable workarounds, unless strict ACPI spec. compliance */
1198     if (!acpi_strict)
1199         acpi_gbl_enable_interpreter_slack = TRUE;
1200 
1201     acpi_permanent_mmap = true;
1202 
1203 #ifdef CONFIG_X86
1204     /*
1205      * If the machine falls into the DMI check table,
1206      * DSDT will be copied to memory.
1207      * Note that calling dmi_check_system() here on other architectures
1208      * would not be OK because only x86 initializes dmi early enough.
1209      * Thankfully only x86 systems need such quirks for now.
1210      */
1211     dmi_check_system(dsdt_dmi_table);
1212 #endif
1213 
1214     status = acpi_reallocate_root_table();
1215     if (ACPI_FAILURE(status)) {
1216         pr_err("Unable to reallocate ACPI tables\n");
1217         goto error0;
1218     }
1219 
1220     status = acpi_initialize_subsystem();
1221     if (ACPI_FAILURE(status)) {
1222         pr_err("Unable to initialize the ACPI Interpreter\n");
1223         goto error0;
1224     }
1225 
1226 #ifdef CONFIG_X86
1227     if (!acpi_ioapic) {
1228         /* compatible (0) means level (3) */
1229         if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1230             acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1231             acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1232         }
1233         /* Set PIC-mode SCI trigger type */
1234         acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1235                      (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1236     } else {
1237         /*
1238          * now that acpi_gbl_FADT is initialized,
1239          * update it with result from INT_SRC_OVR parsing
1240          */
1241         acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1242     }
1243 #endif
1244     return;
1245 
1246  error0:
1247     disable_acpi();
1248 }
1249 
1250 /**
1251  * acpi_subsystem_init - Finalize the early initialization of ACPI.
1252  *
1253  * Switch over the platform to the ACPI mode (if possible).
1254  *
1255  * Doing this too early is generally unsafe, but at the same time it needs to be
1256  * done before all things that really depend on ACPI.  The right spot appears to
1257  * be before finalizing the EFI initialization.
1258  */
1259 void __init acpi_subsystem_init(void)
1260 {
1261     acpi_status status;
1262 
1263     if (acpi_disabled)
1264         return;
1265 
1266     status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1267     if (ACPI_FAILURE(status)) {
1268         pr_err("Unable to enable ACPI\n");
1269         disable_acpi();
1270     } else {
1271         /*
1272          * If the system is using ACPI then we can be reasonably
1273          * confident that any regulators are managed by the firmware
1274          * so tell the regulator core it has everything it needs to
1275          * know.
1276          */
1277         regulator_has_full_constraints();
1278     }
1279 }
1280 
1281 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1282 {
1283     if (event == ACPI_TABLE_EVENT_LOAD)
1284         acpi_scan_table_notify();
1285 
1286     return acpi_sysfs_table_handler(event, table, context);
1287 }
1288 
1289 static int __init acpi_bus_init(void)
1290 {
1291     int result;
1292     acpi_status status;
1293 
1294     acpi_os_initialize1();
1295 
1296     status = acpi_load_tables();
1297     if (ACPI_FAILURE(status)) {
1298         pr_err("Unable to load the System Description Tables\n");
1299         goto error1;
1300     }
1301 
1302     /*
1303      * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1304      * device is found in the namespace.
1305      *
1306      * This is accomplished by looking for the ECDT table and getting the EC
1307      * parameters out of that.
1308      *
1309      * Do that before calling acpi_initialize_objects() which may trigger EC
1310      * address space accesses.
1311      */
1312     acpi_ec_ecdt_probe();
1313 
1314     status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1315     if (ACPI_FAILURE(status)) {
1316         pr_err("Unable to start the ACPI Interpreter\n");
1317         goto error1;
1318     }
1319 
1320     status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1321     if (ACPI_FAILURE(status)) {
1322         pr_err("Unable to initialize ACPI objects\n");
1323         goto error1;
1324     }
1325 
1326     /* Set capability bits for _OSC under processor scope */
1327     acpi_early_processor_osc();
1328 
1329     /*
1330      * _OSC method may exist in module level code,
1331      * so it must be run after ACPI_FULL_INITIALIZATION
1332      */
1333     acpi_bus_osc_negotiate_platform_control();
1334     acpi_bus_osc_negotiate_usb_control();
1335 
1336     /*
1337      * _PDC control method may load dynamic SSDT tables,
1338      * and we need to install the table handler before that.
1339      */
1340     status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1341 
1342     acpi_sysfs_init();
1343 
1344     acpi_early_processor_set_pdc();
1345 
1346     /*
1347      * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1348      * is necessary to enable it as early as possible.
1349      */
1350     acpi_ec_dsdt_probe();
1351 
1352     pr_info("Interpreter enabled\n");
1353 
1354     /* Initialize sleep structures */
1355     acpi_sleep_init();
1356 
1357     /*
1358      * Get the system interrupt model and evaluate \_PIC.
1359      */
1360     result = acpi_bus_init_irq();
1361     if (result)
1362         goto error1;
1363 
1364     /*
1365      * Register the for all standard device notifications.
1366      */
1367     status =
1368         acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1369                     &acpi_bus_notify, NULL);
1370     if (ACPI_FAILURE(status)) {
1371         pr_err("Unable to register for system notifications\n");
1372         goto error1;
1373     }
1374 
1375     /*
1376      * Create the top ACPI proc directory
1377      */
1378     acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1379 
1380     result = bus_register(&acpi_bus_type);
1381     if (!result)
1382         return 0;
1383 
1384     /* Mimic structured exception handling */
1385       error1:
1386     acpi_terminate();
1387     return -ENODEV;
1388 }
1389 
1390 struct kobject *acpi_kobj;
1391 EXPORT_SYMBOL_GPL(acpi_kobj);
1392 
1393 static int __init acpi_init(void)
1394 {
1395     int result;
1396 
1397     if (acpi_disabled) {
1398         pr_info("Interpreter disabled.\n");
1399         return -ENODEV;
1400     }
1401 
1402     acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1403     if (!acpi_kobj)
1404         pr_debug("%s: kset create error\n", __func__);
1405 
1406     init_prmt();
1407     acpi_init_pcc();
1408     result = acpi_bus_init();
1409     if (result) {
1410         kobject_put(acpi_kobj);
1411         disable_acpi();
1412         return result;
1413     }
1414 
1415     pci_mmcfg_late_init();
1416     acpi_iort_init();
1417     acpi_viot_early_init();
1418     acpi_hest_init();
1419     acpi_ghes_init();
1420     acpi_scan_init();
1421     acpi_ec_init();
1422     acpi_debugfs_init();
1423     acpi_sleep_proc_init();
1424     acpi_wakeup_device_init();
1425     acpi_debugger_init();
1426     acpi_setup_sb_notify_handler();
1427     acpi_viot_init();
1428     acpi_agdi_init();
1429     return 0;
1430 }
1431 
1432 subsys_initcall(acpi_init);
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