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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/x86/include/asm/amd/node.h
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/* SPDX-License-Identifier: GPL-2.0 */

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/*

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 * AMD Node helper functions and common defines

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 *

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 * Copyright (c) 2024, Advanced Micro Devices, Inc.

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 * All Rights Reserved.

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 *

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 * Author: Yazen Ghannam <[email protected]>

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 *

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 * Note:

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 * Items in this file may only be used in a single place.

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 * However, it's prudent to keep all AMD Node functionality

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 * in a unified place rather than spreading throughout the

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 * kernel.

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 */

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#ifndef _ASM_X86_AMD_NODE_H_

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#define _ASM_X86_AMD_NODE_H_

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#include <linux/pci.h>

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#define MAX_AMD_NUM_NODES	8

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#define AMD_NODE0_PCI_SLOT	0x18

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struct pci_dev *amd_node_get_func(u16 node, u8 func);

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struct pci_dev *amd_node_get_root(u16 node);

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static inline u16 amd_num_nodes(void)

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{

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	return topology_amd_nodes_per_pkg() * topology_max_packages();

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}

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#ifdef CONFIG_AMD_NODE

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int __must_check amd_smn_read(u16 node, u32 address, u32 *value);

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int __must_check amd_smn_write(u16 node, u32 address, u32 value);

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/* Should only be used by the HSMP driver. */

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int __must_check amd_smn_hsmp_rdwr(u16 node, u32 address, u32 *value, bool write);

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#else

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static inline int __must_check amd_smn_read(u16 node, u32 address, u32 *value) { return -ENODEV; }

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static inline int __must_check amd_smn_write(u16 node, u32 address, u32 value) { return -ENODEV; }

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static inline int __must_check amd_smn_hsmp_rdwr(u16 node, u32 address, u32 *value, bool write)

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{

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	return -ENODEV;

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}

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#endif /* CONFIG_AMD_NODE */

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/* helper for use with read_poll_timeout */

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static inline int smn_read_register(u32 reg)

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{

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	int data, rc;

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	rc = amd_smn_read(0, reg, &data);

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	if (rc)

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		return rc;

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	return data;

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}

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#endif /*_ASM_X86_AMD_NODE_H_*/

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