efi: dmi: add support for SMBIOS 3.0 UEFI configuration table

This adds support to the UEFI side for detecting the presence of
a SMBIOS 3.0 64-bit entry point. This allows the actual SMBIOS
structure table to reside at a physical offset over 4 GB, which
cannot be supported by the legacy SMBIOS 32-bit entry point.

Since the firmware can legally provide both entry points, store
the SMBIOS 3.0 entry point in a separate variable, and let the
DMI decoding layer decide which one will be used.

Tested-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Acked-by: Leif Lindholm <leif.lindholm@linaro.org>
Acked-by: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 8590099..9035c1b 100644 (file)
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -30,6 +30,7 @@ struct efi __read_mostly efi = {
        .acpi       = EFI_INVALID_TABLE_ADDR,
        .acpi20     = EFI_INVALID_TABLE_ADDR,
        .smbios     = EFI_INVALID_TABLE_ADDR,
+       .smbios3    = EFI_INVALID_TABLE_ADDR,
        .sal_systab = EFI_INVALID_TABLE_ADDR,
        .boot_info  = EFI_INVALID_TABLE_ADDR,
        .hcdp       = EFI_INVALID_TABLE_ADDR,
@@ -86,6 +87,8 @@ static ssize_t systab_show(struct kobject *kobj,
                str += sprintf(str, "ACPI=0x%lx\n", efi.acpi);
        if (efi.smbios != EFI_INVALID_TABLE_ADDR)
                str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios);
+       if (efi.smbios3 != EFI_INVALID_TABLE_ADDR)
+               str += sprintf(str, "SMBIOS3=0x%lx\n", efi.smbios3);
        if (efi.hcdp != EFI_INVALID_TABLE_ADDR)
                str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp);
        if (efi.boot_info != EFI_INVALID_TABLE_ADDR)
@@ -260,6 +263,7 @@ static __initdata efi_config_table_type_t common_tables[] = {
        {MPS_TABLE_GUID, "MPS", &efi.mps},
        {SAL_SYSTEM_TABLE_GUID, "SALsystab", &efi.sal_systab},
        {SMBIOS_TABLE_GUID, "SMBIOS", &efi.smbios},
+       {SMBIOS3_TABLE_GUID, "SMBIOS 3.0", &efi.smbios3},
        {UGA_IO_PROTOCOL_GUID, "UGA", &efi.uga},
        {NULL_GUID, NULL, NULL},
 };

diff --git a/drivers/xen/efi.c b/drivers/xen/efi.c
index 1f850c9..f745db2 100644 (file)
--- a/drivers/xen/efi.c
+++ b/drivers/xen/efi.c
@@ -294,6 +294,7 @@ static const struct efi efi_xen __initconst = {
        .acpi                     = EFI_INVALID_TABLE_ADDR,
        .acpi20                   = EFI_INVALID_TABLE_ADDR,
        .smbios                   = EFI_INVALID_TABLE_ADDR,
+       .smbios3                  = EFI_INVALID_TABLE_ADDR,
        .sal_systab               = EFI_INVALID_TABLE_ADDR,
        .boot_info                = EFI_INVALID_TABLE_ADDR,
        .hcdp                     = EFI_INVALID_TABLE_ADDR,

diff --git a/include/linux/efi.h b/include/linux/efi.h
index 0949f9c..0238d61 100644 (file)
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -547,6 +547,9 @@ void efi_native_runtime_setup(void);
 #define SMBIOS_TABLE_GUID    \
     EFI_GUID(  0xeb9d2d31, 0x2d88, 0x11d3, 0x9a, 0x16, 0x0, 0x90, 0x27, 0x3f, 0xc1, 0x4d )
 
+#define SMBIOS3_TABLE_GUID    \
+    EFI_GUID(  0xf2fd1544, 0x9794, 0x4a2c, 0x99, 0x2e, 0xe5, 0xbb, 0xcf, 0x20, 0xe3, 0x94 )
+
 #define SAL_SYSTEM_TABLE_GUID    \
     EFI_GUID(  0xeb9d2d32, 0x2d88, 0x11d3, 0x9a, 0x16, 0x0, 0x90, 0x27, 0x3f, 0xc1, 0x4d )
 
@@ -810,7 +813,8 @@ extern struct efi {
        unsigned long mps;              /* MPS table */
        unsigned long acpi;             /* ACPI table  (IA64 ext 0.71) */
        unsigned long acpi20;           /* ACPI table  (ACPI 2.0) */
-       unsigned long smbios;           /* SM BIOS table */
+       unsigned long smbios;           /* SMBIOS table (32 bit entry point) */
+       unsigned long smbios3;          /* SMBIOS table (64 bit entry point) */
        unsigned long sal_systab;       /* SAL system table */
        unsigned long boot_info;        /* boot info table */
        unsigned long hcdp;             /* HCDP table */