linux/arch/x86/include/asm/amd_node.h

/* 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);

#endif /*_ASM_X86_AMD_NODE_H_*/
x86: Start moving AMD node functionality out of AMD_NB The "AMD Node" concept spans many families of systems and applies to a number of subsystems and drivers. Currently, the AMD Northbridge code is overloaded with AMD node functionality. However, the node concept is broader than just northbridges. Start files to host common AMD node functions and definitions. Include a helper to find an AMD node device function based on the convention described in AMD documentation. Anything that needs node functionality should include this rather than amd_nb.h. The AMD_NB code will be reduced to only northbridge-specific code needed for legacy systems. Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Link: https://lore.kernel.org/r/20241206161210.163701-5-yazen.ghannam@amd.com 2024-12-06 16:11:57 +00:00			`/* 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);`
x86/amd_nb: Simplify root device search The "root" device search was introduced to support SMN access for Zen systems. This device represents a PCIe root complex. It is not the same as the "CPU/node" devices found at slots 0x18-0x1F. There may be multiple PCIe root complexes within an AMD node. Such is the case with server or High-end Desktop (HEDT) systems, etc. Therefore it is not enough to assume "root <-> AMD node" is a 1-to-1 association. Currently, this is handled by skipping "extra" root complexes during the search. However, the hardware provides the PCI bus number of an AMD node's root device. Use the hardware info to get the root device's bus and drop the extra search code and PCI IDs. Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Link: https://lore.kernel.org/r/20241206161210.163701-7-yazen.ghannam@amd.com 2024-12-06 16:11:59 +00:00			`struct pci_dev *amd_node_get_root(u16 node);`
x86: Start moving AMD node functionality out of AMD_NB The "AMD Node" concept spans many families of systems and applies to a number of subsystems and drivers. Currently, the AMD Northbridge code is overloaded with AMD node functionality. However, the node concept is broader than just northbridges. Start files to host common AMD node functions and definitions. Include a helper to find an AMD node device function based on the convention described in AMD documentation. Anything that needs node functionality should include this rather than amd_nb.h. The AMD_NB code will be reduced to only northbridge-specific code needed for legacy systems. Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Link: https://lore.kernel.org/r/20241206161210.163701-5-yazen.ghannam@amd.com 2024-12-06 16:11:57 +00:00
			`#endif /_ASM_X86_AMD_NODE_H_/`