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David Alan Gilbert" , , , , , Brijesh Singh Subject: [PATCH v12 27/46] x86/compressed/acpi: Move EFI vendor table lookup to helper Date: Mon, 7 Mar 2022 15:33:37 -0600 Message-ID: <20220307213356.2797205-28-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 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: 1701498c-f350-4a6c-a212-08da0082591d X-MS-TrafficTypeDiagnostic: DM6PR12MB4942: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)(36840700001)(46966006)(40470700004)(16526019)(2616005)(186003)(336012)(83380400001)(40460700003)(356005)(26005)(1076003)(426003)(8676002)(4326008)(44832011)(8936002)(7406005)(2906002)(81166007)(5660300002)(36756003)(7416002)(110136005)(316002)(70586007)(70206006)(82310400004)(86362001)(7696005)(6666004)(47076005)(54906003)(36860700001)(508600001)(36900700001)(2101003); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Mar 2022 21:35:06.6428 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1701498c-f350-4a6c-a212-08da0082591d 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: DM6PR12MB4942 Precedence: bulk List-ID: X-Mailing-List: linux-efi@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 | 68 +++++++++++-------------------- arch/x86/boot/compressed/efi.c | 72 +++++++++++++++++++++++++++++++++ arch/x86/boot/compressed/misc.h | 13 ++++++ 3 files changed, 108 insertions(+), 45 deletions(-) diff --git a/arch/x86/boot/compressed/acpi.c b/arch/x86/boot/compressed/acpi.c index 9a824af69961..b0c1dffc5510 100644 --- a/arch/x86/boot/compressed/acpi.c +++ b/arch/x86/boot/compressed/acpi.c @@ -20,48 +20,31 @@ */ struct mem_vector immovable_mem[MAX_NUMNODES*2]; -/* - * Search EFI system tables for RSDP. If both ACPI_20_TABLE_GUID and - * ACPI_TABLE_GUID are found, take the former, which has more features. - */ static acpi_physical_address -__efi_get_rsdp_addr(unsigned long config_tables, unsigned int nr_tables, - bool efi_64) +__efi_get_rsdp_addr(unsigned long cfg_tbl_pa, unsigned int cfg_tbl_len) { - acpi_physical_address rsdp_addr = 0; - #ifdef CONFIG_EFI - int i; - - /* Get EFI tables from systab. */ - for (i = 0; i < nr_tables; i++) { - acpi_physical_address table; - efi_guid_t guid; - - if (efi_64) { - efi_config_table_64_t *tbl = (efi_config_table_64_t *)config_tables + i; - - guid = tbl->guid; - table = tbl->table; - - if (!IS_ENABLED(CONFIG_X86_64) && table >> 32) { - debug_putstr("Error getting RSDP address: EFI config table located above 4GB.\n"); - return 0; - } - } else { - efi_config_table_32_t *tbl = (efi_config_table_32_t *)config_tables + i; - - guid = tbl->guid; - table = tbl->table; - } + unsigned long rsdp_addr; + int ret; - if (!(efi_guidcmp(guid, ACPI_TABLE_GUID))) - rsdp_addr = table; - else if (!(efi_guidcmp(guid, ACPI_20_TABLE_GUID))) - return table; - } + /* + * Search EFI system tables for RSDP. Preferred is ACPI_20_TABLE_GUID to + * ACPI_TABLE_GUID because it has more features. + */ + rsdp_addr = efi_find_vendor_table(boot_params, cfg_tbl_pa, cfg_tbl_len, + ACPI_20_TABLE_GUID); + if (rsdp_addr) + return (acpi_physical_address)rsdp_addr; + + /* No ACPI_20_TABLE_GUID found, fallback to ACPI_TABLE_GUID. */ + rsdp_addr = efi_find_vendor_table(boot_params, cfg_tbl_pa, cfg_tbl_len, + ACPI_TABLE_GUID); + if (rsdp_addr) + return (acpi_physical_address)rsdp_addr; + + debug_putstr("Error getting RSDP address.\n"); #endif - return rsdp_addr; + return 0; } /* EFI/kexec support is 64-bit only. */ @@ -109,7 +92,7 @@ static acpi_physical_address kexec_get_rsdp_addr(void) if (!systab) error("EFI system table not found in kexec boot_params."); - return __efi_get_rsdp_addr((unsigned long)esd->tables, systab->nr_tables, true); + return __efi_get_rsdp_addr((unsigned long)esd->tables, systab->nr_tables); } #else static acpi_physical_address kexec_get_rsdp_addr(void) { return 0; } @@ -123,15 +106,10 @@ static acpi_physical_address efi_get_rsdp_addr(void) 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) - efi_64 = true; - else if (et == EFI_TYPE_32) - efi_64 = false; - else + if (et == EFI_TYPE_NONE) return 0; systab_pa = efi_get_system_table(boot_params); @@ -142,7 +120,7 @@ static acpi_physical_address efi_get_rsdp_addr(void) if (ret || !cfg_tbl_pa) error("EFI config table not found."); - return __efi_get_rsdp_addr(cfg_tbl_pa, cfg_tbl_len, efi_64); + return __efi_get_rsdp_addr(cfg_tbl_pa, cfg_tbl_len); #else return 0; #endif diff --git a/arch/x86/boot/compressed/efi.c b/arch/x86/boot/compressed/efi.c index 70acddbbe7af..f8d26db22659 100644 --- a/arch/x86/boot/compressed/efi.c +++ b/arch/x86/boot/compressed/efi.c @@ -120,3 +120,75 @@ int efi_get_conf_table(struct boot_params *bp, unsigned long *cfg_tbl_pa, return 0; } + +/* Get vendor table address/guid from EFI config table at the given index */ +static int get_vendor_table(void *cfg_tbl, unsigned int idx, + unsigned long *vendor_tbl_pa, + efi_guid_t *vendor_tbl_guid, + enum efi_type et) +{ + if (et == EFI_TYPE_64) { + efi_config_table_64_t *tbl_entry = + (efi_config_table_64_t *)cfg_tbl + idx; + + if (!IS_ENABLED(CONFIG_X86_64) && tbl_entry->table >> 32) { + debug_putstr("Error: EFI config table entry located above 4GB.\n"); + return -EINVAL; + } + + *vendor_tbl_pa = tbl_entry->table; + *vendor_tbl_guid = tbl_entry->guid; + + } else if (et == EFI_TYPE_32) { + efi_config_table_32_t *tbl_entry = + (efi_config_table_32_t *)cfg_tbl + idx; + + *vendor_tbl_pa = tbl_entry->table; + *vendor_tbl_guid = tbl_entry->guid; + } else { + return -EINVAL; + } + + return 0; +} + +/** + * efi_find_vendor_table - Given EFI config table, search it for the physical + * address of the vendor table associated with GUID. + * + * @bp: pointer to boot_params + * @cfg_tbl_pa: pointer to EFI configuration table + * @cfg_tbl_len: number of entries in EFI configuration table + * @guid: GUID of vendor table + * + * Return: vendor table address on success. On error, return 0. + */ +unsigned long efi_find_vendor_table(struct boot_params *bp, + unsigned long cfg_tbl_pa, + unsigned int cfg_tbl_len, + efi_guid_t guid) +{ + enum efi_type et; + unsigned int i; + + et = efi_get_type(bp); + if (et == EFI_TYPE_NONE) + return 0; + + for (i = 0; i < cfg_tbl_len; i++) { + unsigned long vendor_tbl_pa; + efi_guid_t vendor_tbl_guid; + int ret; + + ret = get_vendor_table((void *)cfg_tbl_pa, i, + &vendor_tbl_pa, + &vendor_tbl_guid, et); + if (ret) + return 0; + + if (!efi_guidcmp(guid, vendor_tbl_guid)) + return vendor_tbl_pa; + } + + return 0; +} diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h index 8815af092a10..ba538af37e90 100644 --- a/arch/x86/boot/compressed/misc.h +++ b/arch/x86/boot/compressed/misc.h @@ -23,6 +23,7 @@ #include #include #include +#include #include #include #include @@ -188,6 +189,10 @@ 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); +unsigned long efi_find_vendor_table(struct boot_params *bp, + unsigned long cfg_tbl_pa, + unsigned int cfg_tbl_len, + efi_guid_t guid); #else static inline enum efi_type efi_get_type(struct boot_params *bp) { @@ -205,6 +210,14 @@ static inline int efi_get_conf_table(struct boot_params *bp, { return -ENOENT; } + +static inline unsigned long efi_find_vendor_table(struct boot_params *bp, + unsigned long cfg_tbl_pa, + unsigned int cfg_tbl_len, + efi_guid_t guid) +{ + return 0; +} #endif /* CONFIG_EFI */ #endif /* BOOT_COMPRESSED_MISC_H */