| /* SPDX-License-Identifier: GPL-2.0 */ | |
| /* | |
| * AMD Node helper functions and common defines | |
| * | |
| * Copyright (c) 2024, Advanced Micro Devices, Inc. | |
| * All Rights Reserved. | |
| * | |
| * Author: Yazen Ghannam <Yazen.Ghannam@amd.com> | |
| * | |
| * Note: | |
| * Items in this file may only be used in a single place. | |
| * However, it's prudent to keep all AMD Node functionality | |
| * in a unified place rather than spreading throughout the | |
| * kernel. | |
| */ | |
| #ifndef _ASM_X86_AMD_NODE_H_ | |
| #define _ASM_X86_AMD_NODE_H_ | |
| #include <linux/pci.h> | |
| #define MAX_AMD_NUM_NODES 8 | |
| #define AMD_NODE0_PCI_SLOT 0x18 | |
| struct pci_dev *amd_node_get_func(u16 node, u8 func); | |
| static inline u16 amd_num_nodes(void) | |
| { | |
| return topology_amd_nodes_per_pkg() * topology_max_packages(); | |
| } | |
| #ifdef CONFIG_AMD_NODE | |
| int __must_check amd_smn_read(u16 node, u32 address, u32 *value); | |
| int __must_check amd_smn_write(u16 node, u32 address, u32 value); | |
| /* Should only be used by the HSMP driver. */ | |
| int __must_check amd_smn_hsmp_rdwr(u16 node, u32 address, u32 *value, bool write); | |
| #else | |
| static inline int __must_check amd_smn_read(u16 node, u32 address, u32 *value) { return -ENODEV; } | |
| static inline int __must_check amd_smn_write(u16 node, u32 address, u32 value) { return -ENODEV; } | |
| static inline int __must_check amd_smn_hsmp_rdwr(u16 node, u32 address, u32 *value, bool write) | |
| { | |
| return -ENODEV; | |
| } | |
| #endif /* CONFIG_AMD_NODE */ | |
| /* helper for use with read_poll_timeout */ | |
| static inline int smn_read_register(u32 reg) | |
| { | |
| int data, rc; | |
| rc = amd_smn_read(0, reg, &data); | |
| if (rc) | |
| return rc; | |
| return data; | |
| } | |
| #endif /*_ASM_X86_AMD_NODE_H_*/ |