| /* 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); |
| struct pci_dev *amd_node_get_root(u16 node); |
| |
| 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 */ |
| |
| #endif /*_ASM_X86_AMD_NODE_H_*/ |
