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David Alan Gilbert" , , , , , Brijesh Singh Subject: [PATCH v12 26/46] x86/compressed/acpi: Move EFI config table lookup to helper Date: Mon, 7 Mar 2022 15:33:36 -0600 Message-ID: <20220307213356.2797205-27-brijesh.singh@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220307213356.2797205-1-brijesh.singh@amd.com> References: <20220307213356.2797205-1-brijesh.singh@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: cad4a300-a4a6-499b-9d61-08da00825831 X-MS-TrafficTypeDiagnostic: DS7PR12MB5960:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230001)(4636009)(40470700004)(36840700001)(46966006)(83380400001)(8936002)(36756003)(1076003)(508600001)(70586007)(54906003)(110136005)(26005)(186003)(16526019)(7406005)(7416002)(86362001)(6666004)(5660300002)(7696005)(2616005)(82310400004)(316002)(426003)(336012)(36860700001)(47076005)(44832011)(356005)(2906002)(81166007)(40460700003)(8676002)(4326008)(70206006)(36900700001)(2101003);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Mar 2022 21:35:05.1116 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: cad4a300-a4a6-499b-9d61-08da00825831 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=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT024.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB5960 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Michael Roth Future patches for SEV-SNP-validated CPUID will also require early parsing of the EFI configuration. Incrementally move the related code into a set of helpers that can be re-used for that purpose. Signed-off-by: Michael Roth Signed-off-by: Brijesh Singh --- arch/x86/boot/compressed/acpi.c | 25 ++++++------------- arch/x86/boot/compressed/efi.c | 43 +++++++++++++++++++++++++++++++++ arch/x86/boot/compressed/misc.h | 9 +++++++ 3 files changed, 60 insertions(+), 17 deletions(-) diff --git a/arch/x86/boot/compressed/acpi.c b/arch/x86/boot/compressed/acpi.c index 58a3d3f3e305..9a824af69961 100644 --- a/arch/x86/boot/compressed/acpi.c +++ b/arch/x86/boot/compressed/acpi.c @@ -118,10 +118,13 @@ static acpi_physical_address kexec_get_rsdp_addr(void) { return 0; } static acpi_physical_address efi_get_rsdp_addr(void) { #ifdef CONFIG_EFI - unsigned long systab_pa, config_tables; + unsigned long cfg_tbl_pa = 0; + unsigned int cfg_tbl_len; + unsigned long systab_pa; unsigned int nr_tables; enum efi_type et; bool efi_64; + int ret; et = efi_get_type(boot_params); if (et == EFI_TYPE_64) @@ -135,23 +138,11 @@ static acpi_physical_address efi_get_rsdp_addr(void) if (!systab_pa) error("EFI support advertised, but unable to locate system table."); - /* Handle EFI bitness properly */ - if (efi_64) { - efi_system_table_64_t *stbl = (efi_system_table_64_t *)systab_pa; - - config_tables = stbl->tables; - nr_tables = stbl->nr_tables; - } else { - efi_system_table_32_t *stbl = (efi_system_table_32_t *)systab_pa; - - config_tables = stbl->tables; - nr_tables = stbl->nr_tables; - } - - if (!config_tables) - error("EFI config tables not found."); + ret = efi_get_conf_table(boot_params, &cfg_tbl_pa, &cfg_tbl_len); + if (ret || !cfg_tbl_pa) + error("EFI config table not found."); - return __efi_get_rsdp_addr(config_tables, nr_tables, efi_64); + return __efi_get_rsdp_addr(cfg_tbl_pa, cfg_tbl_len, efi_64); #else return 0; #endif diff --git a/arch/x86/boot/compressed/efi.c b/arch/x86/boot/compressed/efi.c index 72a81ba1f87b..70acddbbe7af 100644 --- a/arch/x86/boot/compressed/efi.c +++ b/arch/x86/boot/compressed/efi.c @@ -77,3 +77,46 @@ unsigned long efi_get_system_table(struct boot_params *bp) return sys_tbl_pa; } + +/** + * efi_get_conf_table - Given a pointer to boot_params, locate and return the physical + * address of EFI configuration table. + * + * @bp: pointer to boot_params + * @cfg_tbl_pa: location to store physical address of config table + * @cfg_tbl_len: location to store number of config table entries + * + * Return: 0 on success. On error, return params are left unchanged. + */ +int efi_get_conf_table(struct boot_params *bp, unsigned long *cfg_tbl_pa, + unsigned int *cfg_tbl_len) +{ + unsigned long sys_tbl_pa = 0; + enum efi_type et; + int ret; + + if (!cfg_tbl_pa || !cfg_tbl_len) + return -EINVAL; + + sys_tbl_pa = efi_get_system_table(bp); + if (!sys_tbl_pa) + return -EINVAL; + + /* Handle EFI bitness properly */ + et = efi_get_type(bp); + if (et == EFI_TYPE_64) { + efi_system_table_64_t *stbl = (efi_system_table_64_t *)sys_tbl_pa; + + *cfg_tbl_pa = stbl->tables; + *cfg_tbl_len = stbl->nr_tables; + } else if (et == EFI_TYPE_32) { + efi_system_table_32_t *stbl = (efi_system_table_32_t *)sys_tbl_pa; + + *cfg_tbl_pa = stbl->tables; + *cfg_tbl_len = stbl->nr_tables; + } else { + return -EINVAL; + } + + return 0; +} diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h index b2acd3ac6525..8815af092a10 100644 --- a/arch/x86/boot/compressed/misc.h +++ b/arch/x86/boot/compressed/misc.h @@ -186,6 +186,8 @@ enum efi_type { /* helpers for early EFI config table access */ enum efi_type efi_get_type(struct boot_params *bp); unsigned long efi_get_system_table(struct boot_params *bp); +int efi_get_conf_table(struct boot_params *bp, unsigned long *cfg_tbl_pa, + unsigned int *cfg_tbl_len); #else static inline enum efi_type efi_get_type(struct boot_params *bp) { @@ -196,6 +198,13 @@ static inline unsigned long efi_get_system_table(struct boot_params *bp) { return 0; } + +static inline int efi_get_conf_table(struct boot_params *bp, + unsigned long *cfg_tbl_pa, + unsigned int *cfg_tbl_len) +{ + return -ENOENT; +} #endif /* CONFIG_EFI */ #endif /* BOOT_COMPRESSED_MISC_H */ -- 2.25.1