diff mbox series

[v7,04/10] arm_ffa: efi: unmap RX/TX buffers

Message ID 20221107192055.21669-5-abdellatif.elkhlifi@arm.com
State Changes Requested
Delegated to: Ilias Apalodimas
Headers show
Series introduce Arm FF-A support | expand

Commit Message

Abdellatif El Khlifi Nov. 7, 2022, 7:20 p.m. UTC 
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>

---

Changelog:
===============

v7: replace debug() by log_err()

lib/efi_loader/efi_boottime.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)
diff mbox series

Patch

diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index a56021559b..b0b61bc812 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 +2185,12 @@  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())
+			log_err("Can't unmap FF-A RX/TX buffers\n");
+#endif
+
 	/* Patch out unsupported runtime function */
 	efi_runtime_detach();