// SPDX-License-Identifier: GPL-2.0-only /* * dcdbas.c: Dell Systems Management Base Driver * * The Dell Systems Management Base Driver provides a sysfs interface for * systems management software to perform System Management Interrupts (SMIs) * and Host Control Actions (power cycle or power off after OS shutdown) on * Dell systems. * * See Documentation/userspace-api/dcdbas.rst for more information. * * Copyright (C) 1995-2006 Dell Inc. */ #include <linux/platform_device.h> #include <linux/acpi.h> #include <linux/dma-mapping.h> #include <linux/dmi.h> #include <linux/errno.h> #include <linux/cpu.h> #include <linux/gfp.h> #include <linux/init.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/mc146818rtc.h> #include <linux/module.h> #include <linux/reboot.h> #include <linux/sched.h> #include <linux/smp.h> #include <linux/spinlock.h> #include <linux/string.h> #include <linux/types.h> #include <linux/mutex.h> #include "dcdbas.h" #define DRIVER_NAME … #define DRIVER_VERSION … #define DRIVER_DESCRIPTION … static struct platform_device *dcdbas_pdev; static unsigned long max_smi_data_buf_size = …; static DEFINE_MUTEX(smi_data_lock); static u8 *bios_buffer; static struct smi_buffer smi_buf; static unsigned int host_control_action; static unsigned int host_control_smi_type; static unsigned int host_control_on_shutdown; static bool wsmt_enabled; int dcdbas_smi_alloc(struct smi_buffer *smi_buffer, unsigned long size) { … } EXPORT_SYMBOL_GPL(…); void dcdbas_smi_free(struct smi_buffer *smi_buffer) { … } EXPORT_SYMBOL_GPL(…); /** * smi_data_buf_free: free SMI data buffer */ static void smi_data_buf_free(void) { … } /** * smi_data_buf_realloc: grow SMI data buffer if needed */ static int smi_data_buf_realloc(unsigned long size) { … } static ssize_t smi_data_buf_phys_addr_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t smi_data_buf_size_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t smi_data_buf_size_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static ssize_t smi_data_read(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t pos, size_t count) { … } static ssize_t smi_data_write(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t pos, size_t count) { … } static ssize_t host_control_action_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t host_control_action_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static ssize_t host_control_smi_type_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t host_control_smi_type_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static ssize_t host_control_on_shutdown_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t host_control_on_shutdown_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static int raise_smi(void *par) { … } /** * dcdbas_smi_request: generate SMI request * * Called with smi_data_lock. */ int dcdbas_smi_request(struct smi_cmd *smi_cmd) { … } EXPORT_SYMBOL(…); /** * smi_request_store: * * The valid values are: * 0: zero SMI data buffer * 1: generate calling interface SMI * 2: generate raw SMI * * User application writes smi_cmd to smi_data before telling driver * to generate SMI. */ static ssize_t smi_request_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } /** * host_control_smi: generate host control SMI * * Caller must set up the host control command in smi_buf.virt. */ static int host_control_smi(void) { … } /** * dcdbas_host_control: initiate host control * * This function is called by the driver after the system has * finished shutting down if the user application specified a * host control action to perform on shutdown. It is safe to * use smi_buf.virt at this point because the system has finished * shutting down and no userspace apps are running. */ static void dcdbas_host_control(void) { … } /* WSMT */ static u8 checksum(u8 *buffer, u8 length) { … } static inline struct smm_eps_table *check_eps_table(u8 *addr) { … } static int dcdbas_check_wsmt(void) { … } /** * dcdbas_reboot_notify: handle reboot notification for host control */ static int dcdbas_reboot_notify(struct notifier_block *nb, unsigned long code, void *unused) { … } static struct notifier_block dcdbas_reboot_nb = …; static DCDBAS_BIN_ATTR_RW(smi_data); static struct bin_attribute *dcdbas_bin_attrs[] = …; static DCDBAS_DEV_ATTR_RW(smi_data_buf_size); static DCDBAS_DEV_ATTR_RO(smi_data_buf_phys_addr); static DCDBAS_DEV_ATTR_WO(smi_request); static DCDBAS_DEV_ATTR_RW(host_control_action); static DCDBAS_DEV_ATTR_RW(host_control_smi_type); static DCDBAS_DEV_ATTR_RW(host_control_on_shutdown); static struct attribute *dcdbas_dev_attrs[] = …; static const struct attribute_group dcdbas_attr_group = …; static int dcdbas_probe(struct platform_device *dev) { … } static void dcdbas_remove(struct platform_device *dev) { … } static struct platform_driver dcdbas_driver = …; static const struct platform_device_info dcdbas_dev_info __initconst = …; static struct platform_device *dcdbas_pdev_reg; /** * dcdbas_init: initialize driver */ static int __init dcdbas_init(void) { … } /** * dcdbas_exit: perform driver cleanup */ static void __exit dcdbas_exit(void) { … } subsys_initcall_sync(dcdbas_init); module_exit(dcdbas_exit); MODULE_DESCRIPTION(…) …; MODULE_VERSION(…); MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …; /* Any System or BIOS claiming to be by Dell */ MODULE_ALIAS(…) …;
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