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AMD Zen-based systems report memory error addresses through machine check banks representing Unified Memory Controllers (UMCs) in the form of UMC relative "normalized" addresses. A normalized address must be converted to a system physical address to be usable by the OS. Future AMD platforms will provide a UEFI PRM module that implements a number of address translation PRM handlers. This will provide an interface for the OS to call platform specific code without requiring the use of SMM or other heavy firmware operations. Add support for the normalized to system physical address translation PRM handler in the AMD Address Translation Library and prefer it over native code if available. The GUID and parameter buffer structure are specific to the normalized to system physical address handler provided by the address translation PRM module included in future AMD systems. The address translation PRM module is documented in chapter 22 of the publicly available "AMD Family 1Ah Models 00h–0Fh and Models 10h–1Fh ACPI v6.5 Porting Guide". [ bp: Massage commit message. ] Signed-off-by: John Allen <john.allen@amd.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Link: https://lore.kernel.org/r/20240730151731.15363-3-john.allen@amd.com
57 lines
1.4 KiB
C
57 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* AMD Address Translation Library
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*
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* prm.c : Plumbing code for ACPI Platform Runtime Mechanism (PRM)
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*
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* Information on AMD PRM modules and handlers including the GUIDs and buffer
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* structures used here are defined in the AMD ACPI Porting Guide in the
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* chapter "Platform Runtime Mechanism Table (PRMT)"
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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: John Allen <john.allen@amd.com>
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*/
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#include "internal.h"
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#include <linux/prmt.h>
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/*
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* PRM parameter buffer - normalized to system physical address, as described
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* in the "PRM Parameter Buffer" section of the AMD ACPI Porting Guide.
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*/
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struct norm_to_sys_param_buf {
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u64 norm_addr;
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u8 socket;
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u64 bank_id;
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void *out_buf;
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} __packed;
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static const guid_t norm_to_sys_guid = GUID_INIT(0xE7180659, 0xA65D, 0x451D,
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0x92, 0xCD, 0x2B, 0x56, 0xF1,
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0x2B, 0xEB, 0xA6);
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unsigned long prm_umc_norm_to_sys_addr(u8 socket_id, u64 bank_id, unsigned long addr)
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{
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struct norm_to_sys_param_buf p_buf;
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unsigned long ret_addr;
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int ret;
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p_buf.norm_addr = addr;
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p_buf.socket = socket_id;
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p_buf.bank_id = bank_id;
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p_buf.out_buf = &ret_addr;
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ret = acpi_call_prm_handler(norm_to_sys_guid, &p_buf);
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if (!ret)
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return ret_addr;
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if (ret == -ENODEV)
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pr_debug("PRM module/handler not available\n");
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else
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pr_notice_once("PRM address translation failed\n");
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return ret;
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}
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