// SPDX-License-Identifier: GPL-2.0-only /* * Copyright 2010 Google Inc. All Rights Reserved. * Author: [email protected] (Duncan Laurie) * * Re-worked to expose sysfs APIs by [email protected] (Mike Waychison) * * EFI SMI interface for Google platforms */ #include <linux/kernel.h> #include <linux/init.h> #include <linux/types.h> #include <linux/device.h> #include <linux/platform_device.h> #include <linux/errno.h> #include <linux/string.h> #include <linux/spinlock.h> #include <linux/dma-mapping.h> #include <linux/fs.h> #include <linux/slab.h> #include <linux/panic_notifier.h> #include <linux/ioctl.h> #include <linux/acpi.h> #include <linux/io.h> #include <linux/uaccess.h> #include <linux/dmi.h> #include <linux/kdebug.h> #include <linux/reboot.h> #include <linux/efi.h> #include <linux/module.h> #include <linux/ucs2_string.h> #include <linux/suspend.h> #define GSMI_SHUTDOWN_CLEAN … /* TODO([email protected]): Tie in HARDLOCKUP_DETECTOR with NMIWDT */ #define GSMI_SHUTDOWN_NMIWDT … #define GSMI_SHUTDOWN_PANIC … #define GSMI_SHUTDOWN_OOPS … #define GSMI_SHUTDOWN_DIE … #define GSMI_SHUTDOWN_MCE … #define GSMI_SHUTDOWN_SOFTWDT … #define GSMI_SHUTDOWN_MBE … #define GSMI_SHUTDOWN_TRIPLE … #define DRIVER_VERSION … #define GSMI_GUID_SIZE … #define GSMI_BUF_SIZE … #define GSMI_BUF_ALIGN … #define GSMI_CALLBACK … /* SMI return codes */ #define GSMI_SUCCESS … #define GSMI_UNSUPPORTED2 … #define GSMI_LOG_FULL … #define GSMI_VAR_NOT_FOUND … #define GSMI_HANDSHAKE_SPIN … #define GSMI_HANDSHAKE_CF … #define GSMI_HANDSHAKE_NONE … #define GSMI_INVALID_PARAMETER … #define GSMI_UNSUPPORTED … #define GSMI_BUFFER_TOO_SMALL … #define GSMI_NOT_READY … #define GSMI_DEVICE_ERROR … #define GSMI_NOT_FOUND … #define QUIRKY_BOARD_HASH … /* Internally used commands passed to the firmware */ #define GSMI_CMD_GET_NVRAM_VAR … #define GSMI_CMD_GET_NEXT_VAR … #define GSMI_CMD_SET_NVRAM_VAR … #define GSMI_CMD_SET_EVENT_LOG … #define GSMI_CMD_CLEAR_EVENT_LOG … #define GSMI_CMD_LOG_S0IX_SUSPEND … #define GSMI_CMD_LOG_S0IX_RESUME … #define GSMI_CMD_CLEAR_CONFIG … #define GSMI_CMD_HANDSHAKE_TYPE … #define GSMI_CMD_RESERVED … /* Magic entry type for kernel events */ #define GSMI_LOG_ENTRY_TYPE_KERNEL … /* SMI buffers must be in 32bit physical address space */ struct gsmi_buf { … }; static struct gsmi_device { … } gsmi_dev; /* Packed structures for communicating with the firmware */ struct gsmi_nvram_var_param { … } __packed; struct gsmi_get_next_var_param { … } __packed; struct gsmi_set_eventlog_param { … } __packed; /* Event log formats */ struct gsmi_log_entry_type_1 { … } __packed; /* * Some platforms don't have explicit SMI handshake * and need to wait for SMI to complete. */ #define GSMI_DEFAULT_SPINCOUNT … static unsigned int spincount = …; module_param(spincount, uint, 0600); MODULE_PARM_DESC(…) …; /* * Some older platforms with Apollo Lake chipsets do not support S0ix logging * in their GSMI handlers, and behaved poorly when resuming via power button * press if the logging was attempted. Updated firmware with proper behavior * has long since shipped, removing the need for this opt-in parameter. It * now exists as an opt-out parameter for folks defiantly running old * firmware, or unforeseen circumstances. After the change from opt-in to * opt-out has baked sufficiently, this parameter should probably be removed * entirely. */ static bool s0ix_logging_enable = …; module_param(s0ix_logging_enable, bool, 0600); static struct gsmi_buf *gsmi_buf_alloc(void) { … } static void gsmi_buf_free(struct gsmi_buf *smibuf) { … } /* * Make a call to gsmi func(sub). GSMI error codes are translated to * in-kernel errnos (0 on success, -ERRNO on error). */ static int gsmi_exec(u8 func, u8 sub) { … } #ifdef CONFIG_EFI static struct efivars efivars; static efi_status_t gsmi_get_variable(efi_char16_t *name, efi_guid_t *vendor, u32 *attr, unsigned long *data_size, void *data) { … } static efi_status_t gsmi_get_next_variable(unsigned long *name_size, efi_char16_t *name, efi_guid_t *vendor) { … } static efi_status_t gsmi_set_variable(efi_char16_t *name, efi_guid_t *vendor, u32 attr, unsigned long data_size, void *data) { … } static const struct efivar_operations efivar_ops = …; #endif /* CONFIG_EFI */ static ssize_t eventlog_write(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t pos, size_t count) { … } static struct bin_attribute eventlog_bin_attr = …; static ssize_t gsmi_clear_eventlog_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { … } static struct kobj_attribute gsmi_clear_eventlog_attr = …; static ssize_t gsmi_clear_config_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { … } static struct kobj_attribute gsmi_clear_config_attr = …; static const struct attribute *gsmi_attrs[] = …; static int gsmi_shutdown_reason(int reason) { … } static int gsmi_reboot_callback(struct notifier_block *nb, unsigned long reason, void *arg) { … } static struct notifier_block gsmi_reboot_notifier = …; static int gsmi_die_callback(struct notifier_block *nb, unsigned long reason, void *arg) { … } static struct notifier_block gsmi_die_notifier = …; static int gsmi_panic_callback(struct notifier_block *nb, unsigned long reason, void *arg) { … } static struct notifier_block gsmi_panic_notifier = …; /* * This hash function was blatantly copied from include/linux/hash.h. * It is used by this driver to obfuscate a board name that requires a * quirk within this driver. * * Please do not remove this copy of the function as any changes to the * global utility hash_64() function would break this driver's ability * to identify a board and provide the appropriate quirk -- [email protected] */ static u64 __init local_hash_64(u64 val, unsigned bits) { … } static u32 __init hash_oem_table_id(char s[8]) { … } static const struct dmi_system_id gsmi_dmi_table[] __initconst = …; MODULE_DEVICE_TABLE(dmi, gsmi_dmi_table); static __init int gsmi_system_valid(void) { … } static struct kobject *gsmi_kobj; static const struct platform_device_info gsmi_dev_info = …; #ifdef CONFIG_PM static void gsmi_log_s0ix_info(u8 cmd) { … } static int gsmi_log_s0ix_suspend(struct device *dev) { … } static int gsmi_log_s0ix_resume(struct device *dev) { … } static const struct dev_pm_ops gsmi_pm_ops = …; static int gsmi_platform_driver_probe(struct platform_device *dev) { … } static struct platform_driver gsmi_driver_info = …; #endif static __init int gsmi_init(void) { … } static void __exit gsmi_exit(void) { … } module_init(…) …; module_exit(gsmi_exit); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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