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This can be used during init time by code that depends on a particular handler. If the handler is not present, then the code does not need to be loaded. Acked-by: "Rafael J. Wysocki (Intel)" Reviewed-by: "Mario Limonciello (AMD)" Signed-off-by: Yazen Ghannam --- drivers/acpi/prmt.c | 6 ++++++ include/linux/prmt.h | 2 ++ 2 files changed, 8 insertions(+) diff --git a/drivers/acpi/prmt.c b/drivers/acpi/prmt.c index 6792d4385eee..7b8b5d2015ec 100644 --- a/drivers/acpi/prmt.c +++ b/drivers/acpi/prmt.c @@ -244,6 +244,12 @@ static struct prm_handler_info *find_prm_handler(const= guid_t *guid) return (struct prm_handler_info *) find_guid_info(guid, GET_HANDLER); } =20 +bool acpi_prm_handler_available(const guid_t *guid) +{ + return find_prm_handler(guid) && find_prm_module(guid); +} +EXPORT_SYMBOL_GPL(acpi_prm_handler_available); + /* In-coming PRM commands */ =20 #define PRM_CMD_RUN_SERVICE 0 diff --git a/include/linux/prmt.h b/include/linux/prmt.h index c53ab287e932..8cdc987de963 100644 --- a/include/linux/prmt.h +++ b/include/linux/prmt.h @@ -4,9 +4,11 @@ =20 #ifdef CONFIG_ACPI_PRMT void init_prmt(void); +bool acpi_prm_handler_available(const guid_t *handler_guid); 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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-ID: <20251017-wip-atl-prm-v2-2-7ab1df4a5fbc@amd.com> References: <20251017-wip-atl-prm-v2-0-7ab1df4a5fbc@amd.com> In-Reply-To: <20251017-wip-atl-prm-v2-0-7ab1df4a5fbc@amd.com> To: "Rafael J. Wysocki" , Len Brown , Yazen Ghannam , Tony Luck , Borislav Petkov CC: , , , Avadhut Naik , John Allen , Mario Limonciello , "Mario Limonciello (AMD)" , Yazen Ghannam X-Mailer: b4 0.15-dev-9b767 X-ClientProxiedBy: satlexmb07.amd.com (10.181.42.216) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL02EPF0001A0FA:EE_|SJ0PR12MB6925:EE_ X-MS-Office365-Filtering-Correlation-Id: 574b34fa-a048-44be-a463-08de0d80d95b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|1800799024|376014; X-Microsoft-Antispam-Message-Info: =?utf-8?B?VXp4NFI1RGx4bUpZTTMzZWdRSEJKbkNYTzZ6bEdnUHRrOTBNNzRaWkdJNnV1?= =?utf-8?B?MXpEVXJFampmbGVvblA1OVFkSFkrTGYrMy9qajFPa3ZWTHR1V2FnM08za3RV?= =?utf-8?B?clN5amdFdFFLTTlDZzNyYjFhcTJnMysybUN3STluMER5TW1VMDl2dEEydzRr?= =?utf-8?B?ZFUyUmdGZnNWODBuZ2J0QXIrcFlGODFxUlZJbUpzK1B3NXlIcHYyNDRYVmdy?= =?utf-8?B?UDJkRVAreGxzc2s3ZjNDN1FNemk2UjdvY2F3LzRtMmhzSDBqZ2RwRktOMUJN?= =?utf-8?B?Njh2alFlNWs1N29IbWpidlJ6UkNlb1Z4OVRoV1R5bXRLOHdoNVNWOFN1MWRu?= =?utf-8?B?amd3T3BkNkFsRFlHTmpYSklmT041ZTNZSXJxRThBRm1qVU9OYzlMQThMSXBH?= =?utf-8?B?N1c1OTRIcFdzdGdHblE5U1huWjR0R25Wb01sbjN1ZzZ3UTBUek9La3N5N0hh?= =?utf-8?B?eFZnS0RSSlovMVVKVWtUTXdJUVFBOU1Tbmw5V3lVVVN4cVBERzcwdDV0MTNQ?= =?utf-8?B?WW8xcDJ6TnV6MWJ2cnVlcFlNcG5SYVhWV0M5QWMycWtzUUxHMENyMlF2UTl6?= =?utf-8?B?c3FDNGpEMXVySkl4S3psV0pTdndsWnF5RmtoRzBPeitTOHIya3dyZ0JFYVFS?= =?utf-8?B?OGRaZGhpSVJ5UVNzUi9EMzIzcGtVSnU3ak1ySFBZSnNhSHgrakFsdlJNVEgw?= =?utf-8?B?VW9WM3ZtYjZ2VVErN1haYzFESURZNGRMaE5GaERDOVNhZSt4eHZxVVZEY0RI?= =?utf-8?B?VTFUR0xLL1diYzkreTRsaHlDdmRZRXR3VjRibGYya2tqMk1GdUdrTDFLS2FM?= =?utf-8?B?QkptUlZSOFZzOGsxT3VVU2RvdmliamxjM09LR3A5YlhnTmsyMmhHSVpZaGZ5?= =?utf-8?B?Mnd5bmhGNnNSWmdWT04wT0Z0YXhtN2o1QVEweFpOSVpkckNZdTNUM2FhTmJE?= =?utf-8?B?a0tBOG9NYWpvN3R3M3NKR2d5b1Q4OXdXSWR2NXJUN0RiS0RQdFZLeGdqV293?= =?utf-8?B?LytlYkxUUWFJUlljTDg2RHMvc1FXeEVQV2Q1blFoazBaUUdzbDBCcFY0YUlp?= =?utf-8?B?anR1dkhPSUFIeDIzMW0veElhVGVaaDIrT29xQUZ4YkJ3cWk0aGUxWFMrZFoz?= =?utf-8?B?bDVsQklpeWlXcEExQ08xMTVJTm5OYVlGYzRGSkJLSmRxNHdUTXVsSjM2OWxw?= =?utf-8?B?elVudkU1aWNsS0djelBOTlUxK25YdGlQbEt4aHpEc01laEhSMkpMNXc3bjF2?= =?utf-8?B?OVdTVlFIUDRSeEg0dTQvbnhPa2sra2VGNGswQjNnVHorZWx1dVFWZXcvb3FI?= =?utf-8?B?cGp2QitWRE5OR3NkcC9WR2RvY25kdzZWRWR5UXp2bGlmV2NYd3JidW9DbWhX?= =?utf-8?B?WC94WjNkSkE4QjFBVmNSS0NIbTJicm9KTjZFL3Y3V0RqMWl3RW5JQ3RjYjRG?= =?utf-8?B?bVdqWVcwTVVIQko0NDhVU0lxWHgyYmVKWkJ1S212b1RHVFJVY2wzMU9ycXNx?= =?utf-8?B?RHc4UUNlVjIzYXVPMTJSR1lqVkgvM0R0V3UrODFrVW10eGFqTzI2MklvenBJ?= =?utf-8?B?UlJWbXg1Q1hya2NSSHNFWlNlMGRHMzZTZ3dCaVdnTjRkdi9XODF6SUhIRWtE?= =?utf-8?B?YWNvR3FPUzZMQ0NoRUQ5QThiOWxIcXZxWFNVVUlKZnhHeUh3bjR2T1JuZmli?= =?utf-8?B?VEVEbUZ2MDkzYkd0UldzRnQwRDYyMHJFNnZLRGFDcmN3dVZ4UDV3RXU4TXQr?= =?utf-8?B?a3FxV2lpZ3drbk9PVEx1MzJQb1VDN2l5Wm91Vkw2eFNERlVyUG9raGI3M3Fp?= =?utf-8?B?YnpaRGRTbm5DUm9YN1lncDA4aGh3K0plTFBzQWpTVTR3dlI2djhaLzMraVRt?= =?utf-8?B?bk16SDhsdVhvTlQvK0ZPMlcrRkMxUlIzdnA2SGJIaXArdDdxRFYzejYxcXNR?= =?utf-8?B?WUZENG1WZUJrNkV0NzhXQ1FoSFVwaEFZREhqZGVMam1MV3NPUW1rNzUya3p5?= =?utf-8?B?MWZsdDRJdmhVZFBpdHpBK1VjRGdIZXF3dTltaTVOYXlqTGl1NXdjWDFrK0ow?= =?utf-8?B?cHcyL3JtVDMvR1hSTkphWTNOUUlNUHg3d1U0dXYzZG9FVFRSSUFuMjhkSTBn?= =?utf-8?Q?HWt4=3D?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(82310400026)(36860700013)(1800799024)(376014);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Oct 2025 13:26:58.6378 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 574b34fa-a048-44be-a463-08de0d80d95b X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL02EPF0001A0FA.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR12MB6925 Currently, the AMD Address Translation Library will fail to load for new, unrecognized systems (based on Data Fabric revision). The intention is to prevent the code from executing on new systems and returning incorrect results. Recent AMD systems may provide UEFI PRM handlers for address translation. This is code provided by the platform through BIOS tables. These are the preferred method for translation, and the Linux native code can be used as a fallback. Future AMD systems are expected to provide PRM handlers by default. And Linux native code will not be used. Adjust the ATL init code so that new, unrecognized systems will default to using PRM handlers only. Reviewed-by: "Mario Limonciello (AMD)" Signed-off-by: Yazen Ghannam --- drivers/ras/amd/atl/internal.h | 6 +++++- drivers/ras/amd/atl/prm.c | 4 ---- drivers/ras/amd/atl/system.c | 23 +++++++++++++++++------ drivers/ras/amd/atl/umc.c | 2 +- 4 files changed, 23 insertions(+), 12 deletions(-) diff --git a/drivers/ras/amd/atl/internal.h b/drivers/ras/amd/atl/internal.h index 2b6279d32774..82a56d9c2be1 100644 --- a/drivers/ras/amd/atl/internal.h +++ b/drivers/ras/amd/atl/internal.h @@ -138,7 +138,8 @@ struct df_flags { __u8 legacy_ficaa : 1, socket_id_shift_quirk : 1, heterogeneous : 1, - __reserved_0 : 5; + prm_only : 1, + __reserved_0 : 4; }; =20 struct df_config { @@ -283,6 +284,9 @@ unsigned long convert_umc_mca_addr_to_sys_addr(struct a= tl_err *err); u64 add_base_and_hole(struct addr_ctx *ctx, u64 addr); u64 remove_base_and_hole(struct addr_ctx *ctx, u64 addr); =20 +/* GUIDs for PRM handlers */ +extern const guid_t norm_to_sys_guid; + #ifdef CONFIG_AMD_ATL_PRM unsigned long prm_umc_norm_to_sys_addr(u8 socket_id, u64 umc_bank_inst_id,= unsigned long addr); #else diff --git a/drivers/ras/amd/atl/prm.c b/drivers/ras/amd/atl/prm.c index 0931a20d213b..0f9bfa96e16a 100644 --- a/drivers/ras/amd/atl/prm.c +++ b/drivers/ras/amd/atl/prm.c @@ -29,10 +29,6 @@ struct norm_to_sys_param_buf { void *out_buf; } __packed; =20 -static const guid_t norm_to_sys_guid =3D GUID_INIT(0xE7180659, 0xA65D, 0x4= 51D, - 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; diff --git a/drivers/ras/amd/atl/system.c b/drivers/ras/amd/atl/system.c index 099841433cf9..812a30e21d3a 100644 --- a/drivers/ras/amd/atl/system.c +++ b/drivers/ras/amd/atl/system.c @@ -12,6 +12,12 @@ =20 #include "internal.h" =20 +#include + +const guid_t norm_to_sys_guid =3D GUID_INIT(0xE7180659, 0xA65D, 0x451D, + 0x92, 0xCD, 0x2B, 0x56, 0xF1, + 0x2B, 0xEB, 0xA6); + int determine_node_id(struct addr_ctx *ctx, u8 socket_id, u8 die_id) { u16 socket_id_bits, die_id_bits; @@ -212,15 +218,17 @@ static int determine_df_rev(void) if (!rev) return determine_df_rev_legacy(); =20 - /* - * Fail out for major revisions other than '4'. - * - * Explicit support should be added for newer systems to avoid issues. - */ if (rev =3D=3D 4) return df4_determine_df_rev(reg); =20 - return -EINVAL; + /* All other systems should have PRM handlers. */ + if (!acpi_prm_handler_available(&norm_to_sys_guid)) { + pr_debug("PRM not available\n"); + return -ENODEV; + } + + df_cfg.flags.prm_only =3D true; + return 0; } =20 static int get_dram_hole_base(void) @@ -297,6 +305,9 @@ int get_df_system_info(void) return ret; } =20 + if (df_cfg.flags.prm_only) + return 0; + apply_node_id_shift(); =20 get_num_maps(); diff --git a/drivers/ras/amd/atl/umc.c b/drivers/ras/amd/atl/umc.c index 6e072b7667e9..18ce419236a5 100644 --- a/drivers/ras/amd/atl/umc.c +++ b/drivers/ras/amd/atl/umc.c @@ -422,7 +422,7 @@ unsigned long convert_umc_mca_addr_to_sys_addr(struct a= tl_err *err) socket_id, die_id, coh_st_inst_id, addr); =20 ret_addr =3D prm_umc_norm_to_sys_addr(socket_id, err->ipid, addr); - if (!IS_ERR_VALUE(ret_addr)) + if (!IS_ERR_VALUE(ret_addr) || df_cfg.flags.prm_only) return ret_addr; =20 return norm_to_sys_addr(socket_id, die_id, coh_st_inst_id, addr); --=20 2.51.0