| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
|---|---|
| 2 | /* |
| 3 | * AMD Address Translation Library |
| 4 | * |
| 5 | * prm.c : Plumbing code for ACPI Platform Runtime Mechanism (PRM) |
| 6 | * |
| 7 | * Information on AMD PRM modules and handlers including the GUIDs and buffer |
| 8 | * structures used here are defined in the AMD ACPI Porting Guide in the |
| 9 | * chapter "Platform Runtime Mechanism Table (PRMT)" |
| 10 | * |
| 11 | * Copyright (c) 2024, Advanced Micro Devices, Inc. |
| 12 | * All Rights Reserved. |
| 13 | * |
| 14 | * Author: John Allen <john.allen@amd.com> |
| 15 | */ |
| 16 | |
| 17 | #include "internal.h" |
| 18 | |
| 19 | #include <linux/prmt.h> |
| 20 | |
| 21 | /* |
| 22 | * PRM parameter buffer - normalized to system physical address, as described |
| 23 | * in the "PRM Parameter Buffer" section of the AMD ACPI Porting Guide. |
| 24 | */ |
| 25 | struct norm_to_sys_param_buf { |
| 26 | u64 norm_addr; |
| 27 | u8 socket; |
| 28 | u64 bank_id; |
| 29 | void *out_buf; |
| 30 | } __packed; |
| 31 | |
| 32 | static const guid_t norm_to_sys_guid = GUID_INIT(0xE7180659, 0xA65D, 0x451D, |
| 33 | 0x92, 0xCD, 0x2B, 0x56, 0xF1, |
| 34 | 0x2B, 0xEB, 0xA6); |
| 35 | |
| 36 | unsigned long prm_umc_norm_to_sys_addr(u8 socket_id, u64 bank_id, unsigned long addr) |
| 37 | { |
| 38 | struct norm_to_sys_param_buf p_buf; |
| 39 | unsigned long ret_addr; |
| 40 | int ret; |
| 41 | |
| 42 | p_buf.norm_addr = addr; |
| 43 | p_buf.socket = socket_id; |
| 44 | p_buf.bank_id = bank_id; |
| 45 | p_buf.out_buf = &ret_addr; |
| 46 | |
| 47 | ret = acpi_call_prm_handler(handler_guid: norm_to_sys_guid, param_buffer: &p_buf); |
| 48 | if (!ret) |
| 49 | return ret_addr; |
| 50 | |
| 51 | if (ret == -ENODEV) |
| 52 | pr_debug("PRM module/handler not available\n"); |
| 53 | else |
| 54 | pr_notice_once("PRM address translation failed\n"); |
| 55 | |
| 56 | return ret; |
| 57 | } |
| 58 |