// SPDX-License-Identifier: GPL-2.0 /* * AMD HSMP Platform Driver * Copyright (c) 2022, AMD. * All Rights Reserved. * * This file provides a device implementation for HSMP interface */ #define pr_fmt(fmt) … #include <asm/amd_hsmp.h> #include <asm/amd_nb.h> #include <linux/delay.h> #include <linux/io.h> #include <linux/miscdevice.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/platform_device.h> #include <linux/semaphore.h> #include <linux/acpi.h> #define DRIVER_NAME … #define DRIVER_VERSION … #define ACPI_HSMP_DEVICE_HID … /* HSMP Status / Error codes */ #define HSMP_STATUS_NOT_READY … #define HSMP_STATUS_OK … #define HSMP_ERR_INVALID_MSG … #define HSMP_ERR_INVALID_INPUT … /* Timeout in millsec */ #define HSMP_MSG_TIMEOUT … #define HSMP_SHORT_SLEEP … #define HSMP_WR … #define HSMP_RD … /* * To access specific HSMP mailbox register, s/w writes the SMN address of HSMP mailbox * register into the SMN_INDEX register, and reads/writes the SMN_DATA reg. * Below are required SMN address for HSMP Mailbox register offsets in SMU address space */ #define SMN_HSMP_BASE … #define SMN_HSMP_MSG_ID … #define SMN_HSMP_MSG_ID_F1A_M0H … #define SMN_HSMP_MSG_RESP … #define SMN_HSMP_MSG_DATA … #define HSMP_INDEX_REG … #define HSMP_DATA_REG … #define HSMP_CDEV_NAME … #define HSMP_DEVNODE_NAME … #define HSMP_METRICS_TABLE_NAME … #define HSMP_ATTR_GRP_NAME_SIZE … /* These are the strings specified in ACPI table */ #define MSG_IDOFF_STR … #define MSG_ARGOFF_STR … #define MSG_RESPOFF_STR … #define MAX_AMD_SOCKETS … struct hsmp_mbaddr_info { … }; struct hsmp_socket { … }; struct hsmp_plat_device { … }; static struct hsmp_plat_device plat_dev; static int amd_hsmp_pci_rdwr(struct hsmp_socket *sock, u32 offset, u32 *value, bool write) { … } static void amd_hsmp_acpi_rdwr(struct hsmp_socket *sock, u32 offset, u32 *value, bool write) { … } static int amd_hsmp_rdwr(struct hsmp_socket *sock, u32 offset, u32 *value, bool write) { … } /* * Send a message to the HSMP port via PCI-e config space registers * or by writing to MMIO space. * * The caller is expected to zero out any unused arguments. * If a response is expected, the number of response words should be greater than 0. * * Returns 0 for success and populates the requested number of arguments. * Returns a negative error code for failure. */ static int __hsmp_send_message(struct hsmp_socket *sock, struct hsmp_message *msg) { … } static int validate_message(struct hsmp_message *msg) { … } int hsmp_send_message(struct hsmp_message *msg) { … } EXPORT_SYMBOL_GPL(…); static int hsmp_test(u16 sock_ind, u32 value) { … } static long hsmp_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) { … } static const struct file_operations hsmp_fops = …; /* This is the UUID used for HSMP */ static const guid_t acpi_hsmp_uuid = …; static inline bool is_acpi_hsmp_uuid(union acpi_object *obj) { … } static inline int hsmp_get_uid(struct device *dev, u16 *sock_ind) { … } static acpi_status hsmp_resource(struct acpi_resource *res, void *data) { … } static int hsmp_read_acpi_dsd(struct hsmp_socket *sock) { … } static int hsmp_read_acpi_crs(struct hsmp_socket *sock) { … } /* Parse the ACPI table to read the data */ static int hsmp_parse_acpi_table(struct device *dev, u16 sock_ind) { … } static ssize_t hsmp_metric_tbl_read(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { … } static int hsmp_get_tbl_dram_base(u16 sock_ind) { … } static umode_t hsmp_is_sock_attr_visible(struct kobject *kobj, struct bin_attribute *battr, int id) { … } static int hsmp_init_metric_tbl_bin_attr(struct bin_attribute **hattrs, u16 sock_ind) { … } /* One bin sysfs for metrics table */ #define NUM_HSMP_ATTRS … static int hsmp_create_attr_list(struct attribute_group *attr_grp, struct device *dev, u16 sock_ind) { … } static int hsmp_create_non_acpi_sysfs_if(struct device *dev) { … } static int hsmp_create_acpi_sysfs_if(struct device *dev) { … } static int hsmp_cache_proto_ver(u16 sock_ind) { … } static inline bool is_f1a_m0h(void) { … } static int init_platform_device(struct device *dev) { … } static const struct acpi_device_id amd_hsmp_acpi_ids[] = …; MODULE_DEVICE_TABLE(acpi, amd_hsmp_acpi_ids); static int hsmp_pltdrv_probe(struct platform_device *pdev) { … } static void hsmp_pltdrv_remove(struct platform_device *pdev) { … } static struct platform_driver amd_hsmp_driver = …; static struct platform_device *amd_hsmp_platdev; static int hsmp_plat_dev_register(void) { … } /* * This check is only needed for backward compatibility of previous platforms. * All new platforms are expected to support ACPI based probing. */ static bool legacy_hsmp_support(void) { … } static int __init hsmp_plt_init(void) { … } static void __exit hsmp_plt_exit(void) { … } device_initcall(hsmp_plt_init); module_exit(hsmp_plt_exit); MODULE_DESCRIPTION(…) …; MODULE_VERSION(…); MODULE_LICENSE(…) …;
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