unmap RX/TX buffers at ExitBootServices()
Unmapping the RX/TX buffers created by u-boot is needed before EFI runtime.
At EFI runtime the linux kernel takes care of allocating its own RX/TX buffers and registering them with the secure world.
Secure world should be using the RX/TX buffers created by the kernel. So, RX/TX buffers created by u-boot must be unmapped.
Signed-off-by: Abdellatif El Khlifi abdellatif.elkhlifi@arm.com Cc: Tom Rini trini@konsulko.com Cc: Simon Glass sjg@chromium.org Cc: Ilias Apalodimas ilias.apalodimas@linaro.org Cc: Jens Wiklander jens.wiklander@linaro.org --- lib/efi_loader/efi_boottime.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c index a56021559b..2054b33568 100644 --- a/lib/efi_loader/efi_boottime.c +++ b/lib/efi_loader/efi_boottime.c @@ -3,6 +3,9 @@ * EFI application boot time services * * Copyright (c) 2016 Alexander Graf + * + * (C) Copyright 2022 ARM Limited + * Abdellatif El Khlifi abdellatif.elkhlifi@arm.com */
#include <common.h> @@ -23,6 +26,10 @@ #include <asm/setjmp.h> #include <linux/libfdt_env.h>
+#if CONFIG_IS_ENABLED(ARM_FFA_TRANSPORT) +#include <arm_ffa.h> +#endif + DECLARE_GLOBAL_DATA_PTR;
/* Task priority level */ @@ -2178,6 +2185,14 @@ static efi_status_t EFIAPI efi_exit_boot_services(efi_handle_t image_handle, dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL); }
+#if CONFIG_IS_ENABLED(ARM_FFA_TRANSPORT) + /* unmap FF-A RX/TX buffers */ + if (ffa_bus_ops_get()->rxtx_unmap()) + debug("[efi_boottime][ERROR]: can not unmap FF-A RX/TX buffers\n"); + else + debug("[efi_boottime][INFO]: FF-A RX/TX buffers unmapped\n"); +#endif + /* Patch out unsupported runtime function */ efi_runtime_detach();