// SPDX-License-Identifier: GPL-2.0 /* * AMD HSMP Platform Driver * Copyright (c) 2024, AMD. * All Rights Reserved. * * This file provides platform device implementations. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include "hsmp.h" #define DRIVER_NAME "amd_hsmp" #define DRIVER_VERSION "2.3" /* * 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 0x3B00000 #define SMN_HSMP_MSG_ID 0x0010534 #define SMN_HSMP_MSG_ID_F1A_M0H 0x0010934 #define SMN_HSMP_MSG_RESP 0x0010980 #define SMN_HSMP_MSG_DATA 0x00109E0 #define HSMP_INDEX_REG 0xc4 #define HSMP_DATA_REG 0xc8 static int amd_hsmp_pci_rdwr(struct hsmp_socket *sock, u32 offset, u32 *value, bool write) { int ret; if (!sock->root) return -ENODEV; ret = pci_write_config_dword(sock->root, HSMP_INDEX_REG, sock->mbinfo.base_addr + offset); if (ret) return ret; ret = (write ? pci_write_config_dword(sock->root, HSMP_DATA_REG, *value) : pci_read_config_dword(sock->root, HSMP_DATA_REG, value)); return ret; } static int hsmp_create_non_acpi_sysfs_if(struct device *dev) { const struct attribute_group **hsmp_attr_grps; struct attribute_group *attr_grp; u16 i; hsmp_attr_grps = devm_kcalloc(dev, hsmp_pdev.num_sockets + 1, sizeof(*hsmp_attr_grps), GFP_KERNEL); if (!hsmp_attr_grps) return -ENOMEM; /* Create a sysfs directory for each socket */ for (i = 0; i < hsmp_pdev.num_sockets; i++) { attr_grp = devm_kzalloc(dev, sizeof(struct attribute_group), GFP_KERNEL); if (!attr_grp) return -ENOMEM; snprintf(hsmp_pdev.sock[i].name, HSMP_ATTR_GRP_NAME_SIZE, "socket%u", (u8)i); attr_grp->name = hsmp_pdev.sock[i].name; attr_grp->is_bin_visible = hsmp_is_sock_attr_visible; hsmp_attr_grps[i] = attr_grp; hsmp_create_attr_list(attr_grp, dev, i); } return device_add_groups(dev, hsmp_attr_grps); } static inline bool is_f1a_m0h(void) { if (boot_cpu_data.x86 == 0x1A && boot_cpu_data.x86_model <= 0x0F) return true; return false; } static int init_platform_device(struct device *dev) { struct hsmp_socket *sock; int ret, i; for (i = 0; i < hsmp_pdev.num_sockets; i++) { if (!node_to_amd_nb(i)) return -ENODEV; sock = &hsmp_pdev.sock[i]; sock->root = node_to_amd_nb(i)->root; sock->sock_ind = i; sock->dev = dev; sock->mbinfo.base_addr = SMN_HSMP_BASE; sock->amd_hsmp_rdwr = amd_hsmp_pci_rdwr; /* * This is a transitional change from non-ACPI to ACPI, only * family 0x1A, model 0x00 platform is supported for both ACPI and non-ACPI. */ if (is_f1a_m0h()) sock->mbinfo.msg_id_off = SMN_HSMP_MSG_ID_F1A_M0H; else sock->mbinfo.msg_id_off = SMN_HSMP_MSG_ID; sock->mbinfo.msg_resp_off = SMN_HSMP_MSG_RESP; sock->mbinfo.msg_arg_off = SMN_HSMP_MSG_DATA; sema_init(&sock->hsmp_sem, 1); /* Test the hsmp interface on each socket */ ret = hsmp_test(i, 0xDEADBEEF); if (ret) { dev_err(dev, "HSMP test message failed on Fam:%x model:%x\n", boot_cpu_data.x86, boot_cpu_data.x86_model); dev_err(dev, "Is HSMP disabled in BIOS ?\n"); return ret; } ret = hsmp_cache_proto_ver(i); if (ret) { dev_err(dev, "Failed to read HSMP protocol version\n"); return ret; } } return 0; } static int hsmp_pltdrv_probe(struct platform_device *pdev) { int ret; hsmp_pdev.sock = devm_kcalloc(&pdev->dev, hsmp_pdev.num_sockets, sizeof(*hsmp_pdev.sock), GFP_KERNEL); if (!hsmp_pdev.sock) return -ENOMEM; ret = init_platform_device(&pdev->dev); if (ret) { dev_err(&pdev->dev, "Failed to init HSMP mailbox\n"); return ret; } ret = hsmp_create_non_acpi_sysfs_if(&pdev->dev); if (ret) dev_err(&pdev->dev, "Failed to create HSMP sysfs interface\n"); return hsmp_misc_register(&pdev->dev); } static void hsmp_pltdrv_remove(struct platform_device *pdev) { hsmp_misc_deregister(); } static struct platform_driver amd_hsmp_driver = { .probe = hsmp_pltdrv_probe, .remove = hsmp_pltdrv_remove, .driver = { .name = DRIVER_NAME, }, }; static struct platform_device *amd_hsmp_platdev; static int hsmp_plat_dev_register(void) { int ret; amd_hsmp_platdev = platform_device_alloc(DRIVER_NAME, PLATFORM_DEVID_NONE); if (!amd_hsmp_platdev) return -ENOMEM; ret = platform_device_add(amd_hsmp_platdev); if (ret) platform_device_put(amd_hsmp_platdev); return ret; } /* * 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) { if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) return false; switch (boot_cpu_data.x86) { case 0x19: switch (boot_cpu_data.x86_model) { case 0x00 ... 0x1F: case 0x30 ... 0x3F: case 0x90 ... 0x9F: case 0xA0 ... 0xAF: return true; default: return false; } case 0x1A: switch (boot_cpu_data.x86_model) { case 0x00 ... 0x1F: return true; default: return false; } default: return false; } return false; } static int __init hsmp_plt_init(void) { int ret = -ENODEV; if (!legacy_hsmp_support()) { pr_info("HSMP is not supported on Family:%x model:%x\n", boot_cpu_data.x86, boot_cpu_data.x86_model); return ret; } /* * amd_nb_num() returns number of SMN/DF interfaces present in the system * if we have N SMN/DF interfaces that ideally means N sockets */ hsmp_pdev.num_sockets = amd_nb_num(); if (hsmp_pdev.num_sockets == 0 || hsmp_pdev.num_sockets > MAX_AMD_SOCKETS) return ret; ret = platform_driver_register(&amd_hsmp_driver); if (ret) return ret; ret = hsmp_plat_dev_register(); if (ret) platform_driver_unregister(&amd_hsmp_driver); return ret; } static void __exit hsmp_plt_exit(void) { platform_device_unregister(amd_hsmp_platdev); platform_driver_unregister(&amd_hsmp_driver); } device_initcall(hsmp_plt_init); module_exit(hsmp_plt_exit); MODULE_DESCRIPTION("AMD HSMP Platform Interface Driver"); MODULE_VERSION(DRIVER_VERSION); MODULE_LICENSE("GPL");