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| author | Ard Biesheuvel <ardb@kernel.org> | 2020-01-21 11:17:47 +0100 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2020-02-23 21:59:42 +0100 |
| commit | 96a3dd3dece8134ba19b0ded7e6663136d3107b9 (patch) | |
| tree | 5501c241dbbfce60f986a7f0d92ac061ea2578d9 /drivers/firmware/efi/efi.c | |
| parent | e457ed516a67ea2087950960faaf89ebfb606f06 (diff) | |
| download | linux-96a3dd3dece8134ba19b0ded7e6663136d3107b9.tar.bz2 | |
efi: Store mask of supported runtime services in struct efi
Revision 2.8 of the UEFI spec introduces provisions for firmware to
advertise lack of support for certain runtime services at OS runtime.
Let's store this mask in struct efi for easy access.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Diffstat (limited to 'drivers/firmware/efi/efi.c')
| -rw-r--r-- | drivers/firmware/efi/efi.c | 27 |
1 files changed, 17 insertions, 10 deletions
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index 7dbe1487b111..703a019d81b4 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -34,6 +34,7 @@ #include <asm/early_ioremap.h> struct efi __read_mostly efi = { + .runtime_supported_mask = EFI_RT_SUPPORTED_ALL, .acpi = EFI_INVALID_TABLE_ADDR, .acpi20 = EFI_INVALID_TABLE_ADDR, .smbios = EFI_INVALID_TABLE_ADDR, @@ -301,16 +302,22 @@ static int __init efisubsys_init(void) if (!efi_enabled(EFI_BOOT)) return 0; - /* - * Since we process only one efi_runtime_service() at a time, an - * ordered workqueue (which creates only one execution context) - * should suffice all our needs. - */ - efi_rts_wq = alloc_ordered_workqueue("efi_rts_wq", 0); - if (!efi_rts_wq) { - pr_err("Creating efi_rts_wq failed, EFI runtime services disabled.\n"); - clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); - return 0; + if (!efi_enabled(EFI_RUNTIME_SERVICES)) + efi.runtime_supported_mask = 0; + + if (efi.runtime_supported_mask) { + /* + * Since we process only one efi_runtime_service() at a time, an + * ordered workqueue (which creates only one execution context) + * should suffice for all our needs. + */ + efi_rts_wq = alloc_ordered_workqueue("efi_rts_wq", 0); + if (!efi_rts_wq) { + pr_err("Creating efi_rts_wq failed, EFI runtime services disabled.\n"); + clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); + efi.runtime_supported_mask = 0; + return 0; + } } /* We register the efi directory at /sys/firmware/efi */ |