58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
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// 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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