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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* AMD Address Translation Library
*
* prm.c : Plumbing code for ACPI Platform Runtime Mechanism (PRM)
*
* Information on AMD PRM modules and handlers including the GUIDs and buffer
* structures used here are defined in the AMD ACPI Porting Guide in the
* chapter "Platform Runtime Mechanism Table (PRMT)"
*
* Copyright (c) 2024, Advanced Micro Devices, Inc.
* All Rights Reserved.
*
* Author: John Allen <john.allen@amd.com>
*/
#include "internal.h"
#include <linux/prmt.h>
/*
* PRM parameter buffer - normalized to system physical address, as described
* in the "PRM Parameter Buffer" section of the AMD ACPI Porting Guide.
*/
struct norm_to_sys_param_buf {
u64 norm_addr;
u8 socket;
u64 bank_id;
void *out_buf;
} __packed;
static const guid_t norm_to_sys_guid = GUID_INIT(0xE7180659, 0xA65D, 0x451D,
0x92, 0xCD, 0x2B, 0x56, 0xF1,
0x2B, 0xEB, 0xA6);
unsigned long prm_umc_norm_to_sys_addr(u8 socket_id, u64 bank_id, unsigned long addr)
{
struct norm_to_sys_param_buf p_buf;
unsigned long ret_addr;
int ret;
p_buf.norm_addr = addr;
p_buf.socket = socket_id;
p_buf.bank_id = bank_id;
p_buf.out_buf = &ret_addr;
ret = acpi_call_prm_handler(norm_to_sys_guid, &p_buf);
if (!ret)
return ret_addr;
if (ret == -ENODEV)
pr_debug("PRM module/handler not available\n");
else
pr_notice_once("PRM address translation failed\n");
return ret;
}
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