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/* 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 */
/* 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_*/
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