kernel/linux.git/include/linux/efi.h, branch v7.3-rc1

efi: make efi_guid_to_str() take a const GUID pointer

2026-08-20T11:49:39+00:00

efi_guid_to_str() only formats the GUID through the byte array passed to the UUID printf formatter. It does not modify the GUID contents. Make the input pointer const so callers can stringify GUIDs from const data without a cast. Signed-off-by: Vincent Mailhol Signed-off-by: Ard Biesheuvel

efi/runtime-wrappers: factor out efi_rts_park_worker()

2026-08-20T11:45:04+00:00

x86's efi_crash_gracefully_on_page_fault() ends in an infinite schedule() loop so the kworker that faulted in firmware never runs efi_rts_wq again. A later change needs the same "park this worker forever" primitive on the runtime service timeout path, so factor the loop into a shared efi_rts_park_worker() and call it from the x86 page-fault handler. No functional change. Signed-off-by: Breno Leitao Signed-off-by: Ard Biesheuvel

efi: fix stale reference to efi_recover_from_page_fault()

2026-07-09T05:00:20+00:00

efi_recover_from_page_fault() was renamed to efi_crash_gracefully_on_page_fault(), but the comment above enum efi_rts_ids was not updated. Use the current name. Fixes: c46f52231e79 ("x86/{fault,efi}: Fix and rename efi_recover_from_page_fault()") Signed-off-by: Breno Leitao Signed-off-by: Ard Biesheuvel

efi: efi.h: Remove extra semicolon

2026-05-19T15:26:07+00:00

Remove extra semicolons from comments. Signed-off-by: Rong Tao Signed-off-by: Ard Biesheuvel

efi: Drop unused efi_range_is_wc() function

2026-03-11T18:52:27+00:00

efi_range_is_wc() has no callers, so remove it. Reviewed-by: Ilias Apalodimas Signed-off-by: Ard Biesheuvel

efi: Support EDID information

2025-12-16T13:40:51+00:00

In the EFI config table, rename LINUX_EFI_SCREEN_INFO_TABLE_GUID to LINUX_EFI_PRIMARY_DISPLAY_TABLE_GUID. Read sysfb_primary_display from the entry. In addition to the screen_info, the entry now also contains EDID information. In libstub, replace struct screen_info with struct sysfb_display_info from the kernel's sysfb_primary_display and rename functions accordingly. Transfer it to the runtime kernel using the kernel's global state or the LINUX_EFI_PRIMARY_DISPLAY_TABLE_GUID config-table entry. With CONFIG_FIRMWARE_EDID=y, libstub now transfers the GOP device's EDID information to the kernel. If CONFIG_FIRMWARE_EDID=n, EDID information is disabled. Make the Kconfig symbol CONFIG_FIRMWARE_EDID available with EFI. Setting the value to 'n' disables EDID support. Also rename screen_info.c to primary_display.c and adapt the contained comment according to the changes. Link: https://lore.kernel.org/all/20251126160854.553077-8-tzimmermann@suse.de/ Signed-off-by: Thomas Zimmermann [ardb: depend on EFI_GENERIC_STUB not EFI, fix conflicts after dropping the preceding patch from the series] Signed-off-by: Ard Biesheuvel

Merge tag 'efi-next-for-v6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi

2025-12-05T01:10:08+00:00

Pull EFI updates from Ard Biesheuvel: "The usual trickle of EFI contributions: - Parse SMBIOS tables in memory directly on Macbooks that do not implement the EFI SMBIOS protocol - Obtain EDID information from the primary display while running in the EFI stub, and expose it via bootparams on x86 (generic method is in the works, and will likely land during the next cycle) - Bring CPER handling for ARM systems up to data with the latest EFI spec changes - Various cosmetic changes" * tag 'efi-next-for-v6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi: docs: efi: add CPER functions to driver-api efi/cper: align ARM CPER type with UEFI 2.9A/2.10 specs efi/cper: Add a new helper function to print bitmasks efi/cper: Adjust infopfx size to accept an extra space RAS: Report all ARM processor CPER information to userspace efi/libstub: x86: Store EDID in boot_params efi/libstub: gop: Add support for reading EDID efi/libstub: gop: Initialize screen_info in helper function efi/libstub: gop: Find GOP handle instead of GOP data efi: Fix trailing whitespace in header file efi/memattr: Convert efi_memattr_init() return type to void efi: stmm: fix kernel-doc "bad line" warnings efi/riscv: Remove the useless failure return message print efistub/x86: Add fallback for SMBIOS record lookup

efi/libstub: gop: Add support for reading EDID

2025-11-18T19:39:55+00:00

Add support for EFI_EDID_DISCOVERED_PROTOCOL and EFI_EDID_ACTIVE_PROTOCOL as defined in UEFI 2.8, sec 12.9. Define GUIDs and data structures in the rsp header files. In the GOP setup function, read the EDID of the primary GOP device. First try EFI_EDID_ACTIVE_PROTOCOL, which supports user-specified EDID data. Or else try EFI_EDID_DISCOVERED_PROTOCOL, which returns the display device's native EDID. If no EDID could be retrieved, clear the storage. Rename efi_setup_gop() to efi_setup_graphics() to reflect the changes Let callers pass an optional instance of struct edid_data, if they are interested. While screen_info and edid_info come from the same device handle, they should be considered indendent data. The former refers to the graphics mode, the latter refers to the display device. GOP devices might not provide both. Signed-off-by: Thomas Zimmermann Reviewed-by: Javier Martinez Canillas Signed-off-by: Ard Biesheuvel

efi: Fix trailing whitespace in header file

2025-11-18T19:39:55+00:00

Resolve an issue with the coding style. Signed-off-by: Thomas Zimmermann Reviewed-by: Javier Martinez Canillas Signed-off-by: Ard Biesheuvel

efi/runtime-wrappers: Keep track of the efi_runtime_lock owner

2025-11-11T18:59:22+00:00

The EFI runtime wrappers use a file local semaphore to serialize access to the EFI runtime services. This means that any calls to the arch wrappers around the runtime services will also be serialized, removing the need for redundant locking. For robustness, add a facility that allows those arch wrappers to assert that the semaphore was taken by the current task. Signed-off-by: Ard Biesheuvel Acked-by: Catalin Marinas Signed-off-by: Catalin Marinas