| 1 |
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| 2 | |
| 3 | * AMD Node helper functions and common defines
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| 4 | *
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| 5 | * Copyright (c) 2024, Advanced Micro Devices, Inc.
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| 6 | * All Rights Reserved.
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| 7 | *
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| 8 | * Author: Yazen Ghannam <[email protected]>
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| 9 | *
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| 10 | * Note:
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| 11 | * Items in this file may only be used in a single place.
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| 12 | * However, it's prudent to keep all AMD Node functionality
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| 13 | * in a unified place rather than spreading throughout the
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| 14 | * kernel.
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| 15 |
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| 16 |
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| 17 | #ifndef _ASM_X86_AMD_NODE_H_
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| 18 | #define _ASM_X86_AMD_NODE_H_
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| 19 |
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| 20 | #include <linux/pci.h>
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| 21 |
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| 22 | #define MAX_AMD_NUM_NODES 8
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| 23 | #define AMD_NODE0_PCI_SLOT 0x18
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| 24 |
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| 25 | struct pci_dev *amd_node_get_func(u16 node, u8 func);
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| 26 |
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| 27 | static inline u16 amd_num_nodes(void)
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| 28 | {
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| 29 | return topology_amd_nodes_per_pkg() * topology_max_packages();
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| 30 | }
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| 31 |
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| 32 | #ifdef CONFIG_AMD_NODE
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| 33 | int __must_check amd_smn_read(u16 node, u32 address, u32 *value);
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| 34 | int __must_check amd_smn_write(u16 node, u32 address, u32 value);
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| 35 |
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| 36 |
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| 37 | int __must_check amd_smn_hsmp_rdwr(u16 node, u32 address, u32 *value, bool write);
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| 38 | #else
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| 39 | static inline int __must_check amd_smn_read(u16 node, u32 address, u32 *value) { return -ENODEV; }
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| 40 | static inline int __must_check amd_smn_write(u16 node, u32 address, u32 value) { return -ENODEV; }
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| 41 |
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| 42 | static inline int __must_check amd_smn_hsmp_rdwr(u16 node, u32 address, u32 *value, bool write)
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| 43 | {
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| 44 | return -ENODEV;
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| 45 | }
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| 46 | #endif
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| 47 |
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| 48 |
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| 49 | static inline int smn_read_register(u32 reg)
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| 50 | {
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| 51 | int data, rc;
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| 52 |
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| 53 | rc = amd_smn_read(0, reg, &data);
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| 54 | if (rc)
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| 55 | return rc;
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| 56 |
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| 57 | return data;
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| 58 | }
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| 59 | #endif
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