[PATCH v3 3/4] arm_ffa: introduce Arm FF-A low-level driver

Abdellatif El Khlifi
2022-08-01T17:21:53Z

Add the driver implementing Arm Firmware Framework for Armv8-A v1.0

The Firmware Framework for Arm A-profile processors (FF-A)
describes interfaces (ABIs) that standardize communication
between the Secure World and Normal World leveraging TrustZone
technology.

This driver uses 64-bit registers as per SMCCCv1.2 spec and comes
on top of the SMCCC layer. The driver provides the FF-A ABIs needed for
querying the FF-A framework from the secure world.

32-bit version of the ABIs is supported and 64-bit version of FFA_RXTX_MAP
and FFA_MSG_SEND_DIRECT_{REQ, RESP}.

In u-boot FF-A design, FF-A is considered as a discoverable bus.
The Secure World is considered as one entity to communicate with
using the FF-A bus. FF-A communication is handled by one device and
one instance (the bus). This FF-A driver takes care of all the
interactions between Normal world and Secure World.

The driver exports its operations to be used by upper layers.

Exported operations:

- partition_info_get
- sync_send_receive
- rxtx_unmap

This implementation provides an optional feature to copy the driver data
to EFI runtime area.

Signed-off-by: Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
Cc: Tom Rini <trini@konsulko.com>
Cc: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Cc: Jens Wiklander <jens.wiklander@linaro.org>
---
MAINTAINERS | 6 +
common/board_r.c | 7 +
drivers/Kconfig | 2 +
drivers/Makefile | 1 +
drivers/arm-ffa/Kconfig | 33 +
drivers/arm-ffa/Makefile | 7 +
drivers/arm-ffa/arm-ffa-uclass.c | 16 +
drivers/arm-ffa/arm_ffa_prv.h | 219 ++++
drivers/arm-ffa/core.c | 1338 ++++++++++++++++++++
drivers/arm-ffa/efi_ffa_runtime_data_mgr.c | 94 ++
include/arm_ffa.h | 132 ++
include/dm/uclass-id.h | 1 +
include/uuid.h | 8 +
lib/efi_loader/efi_boottime.c | 17 +
lib/uuid.c | 65 +
15 files changed, 1946 insertions(+)
create mode 100644 drivers/arm-ffa/Kconfig
create mode 100644 drivers/arm-ffa/Makefile
create mode 100644 drivers/arm-ffa/arm-ffa-uclass.c
create mode 100644 drivers/arm-ffa/arm_ffa_prv.h
create mode 100644 drivers/arm-ffa/core.c
create mode 100644 drivers/arm-ffa/efi_ffa_runtime_data_mgr.c
create mode 100644 include/arm_ffa.h

diff --git a/MAINTAINERS b/MAINTAINERS
index f371d864f2..93a57f4df2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -248,6 +248,12 @@ F: drivers/net/cortina_ni.h
F: drivers/net/phy/ca_phy.c
F: configs/cortina_presidio-asic-pnand_defconfig

+ARM FF-A
+M: Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
+S: Maintained
+F: drivers/arm-ffa/
+F: include/arm_ffa.h
+
ARM FREESCALE IMX
M: Stefano Babic <sbabic@denx.de>
M: Fabio Estevam <festevam@gmail.com>
diff --git a/common/board_r.c b/common/board_r.c
index ed29069d2d..2d3f359b96 100644
--- a/common/board_r.c
+++ b/common/board_r.c
@@ -63,6 +63,10 @@
#include <efi_loader.h>
#include <relocate.h>

+#ifdef CONFIG_ARM_FFA_TRANSPORT
+#include <arm_ffa.h>
+#endif
+
DECLARE_GLOBAL_DATA_PTR;

ulong monitor_flash_len;
@@ -767,6 +771,9 @@ static init_fnc_t init_sequence_r[] = {
INIT_FUNC_WATCHDOG_RESET
initr_net,
#endif
+#ifdef CONFIG_ARM_FFA_TRANSPORT
+ ffa_bus_discover,
+#endif
#ifdef CONFIG_POST
initr_post,
#endif
diff --git a/drivers/Kconfig b/drivers/Kconfig
index 8b6fead351..60b5fd4d9d 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -6,6 +6,8 @@ source "drivers/core/Kconfig"

source "drivers/adc/Kconfig"

+source "drivers/arm-ffa/Kconfig"
+
source "drivers/ata/Kconfig"

source "drivers/axi/Kconfig"
diff --git a/drivers/Makefile b/drivers/Makefile
index eba9940231..dfde371381 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -110,6 +110,7 @@ obj-y += iommu/
obj-y += smem/
obj-y += thermal/
obj-$(CONFIG_TEE) += tee/
+obj-$(CONFIG_ARM_FFA_TRANSPORT) += arm-ffa/
obj-y += axi/
obj-y += ufs/
obj-$(CONFIG_W1) += w1/
diff --git a/drivers/arm-ffa/Kconfig b/drivers/arm-ffa/Kconfig
new file mode 100644
index 0000000000..882ffde90f
--- /dev/null
+++ b/drivers/arm-ffa/Kconfig
@@ -0,0 +1,33 @@
+# SPDX-License-Identifier: GPL-2.0
+
+config ARM_FFA_TRANSPORT
+ bool "Enable Arm Firmware Framework for Armv8-A driver"
+ depends on DM && ARM64
+ select ARM_SMCCC
+ select LIB_UUID
+ select DEVRES
+ help
+ The Firmware Framework for Arm A-profile processors (FF-A)
+ describes interfaces (ABIs) that standardize communication
+ between the Secure World and Normal World leveraging TrustZone
+ technology.
+
+ This driver is based on FF-A specification v1.0 and uses SMC32
+ calling convention.
+
+ FF-A specification:
+
+ https://developer.arm.com/documentation/den0077/a/?lang=en
+
+ In u-boot FF-A design, FF-A is considered as a discoverable bus.
+ The Secure World is considered as one entity to communicate with
+ using the FF-A bus.
+ FF-A communication is handled by one device and one instance (the bus).
+ This FF-A driver takes care of all the interactions between Normal world
+ and Secure World.
+
+config ARM_FFA_EFI_RUNTIME_MODE
+ bool "Enable EFI runtime support for FF-A data and code "
+ depends on ARM_FFA_TRANSPORT && EFI_LOADER
+ help
+ Allows FF-A driver data structures and code to be accessible at EFI runtime
diff --git a/drivers/arm-ffa/Makefile b/drivers/arm-ffa/Makefile
new file mode 100644
index 0000000000..0b9b0a61b4
--- /dev/null
+++ b/drivers/arm-ffa/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# (C) Copyright 2022 Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
+#
+
+obj-y += arm-ffa-uclass.o core.o
+obj-$(CONFIG_ARM_FFA_EFI_RUNTIME_MODE) += efi_ffa_runtime_data_mgr.o
diff --git a/drivers/arm-ffa/arm-ffa-uclass.c b/drivers/arm-ffa/arm-ffa-uclass.c
new file mode 100644
index 0000000000..7d9695d289
--- /dev/null
+++ b/drivers/arm-ffa/arm-ffa-uclass.c
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2022 ARM Limited
+ * Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <asm/global_data.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+UCLASS_DRIVER(ffa) = {
+ .name = "ffa",
+ .id = UCLASS_FFA,
+};
diff --git a/drivers/arm-ffa/arm_ffa_prv.h b/drivers/arm-ffa/arm_ffa_prv.h
new file mode 100644
index 0000000000..1133c02400
--- /dev/null
+++ b/drivers/arm-ffa/arm_ffa_prv.h
@@ -0,0 +1,219 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * (C) Copyright 2022 ARM Limited
+ * Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
+ */
+
+#ifndef __ARM_FFA_PRV_H
+#define __ARM_FFA_PRV_H
+
+#include <arm_ffa.h>
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/arm-smccc.h>
+
+/*
+ * This header is private. It is exclusively used by the FF-A driver
+ */
+
+/* FF-A core driver name */
+#define FFA_DRV_NAME "arm_ffa"
+
+/* FF-A driver version definitions */
+
+#define MAJOR_VERSION_MASK GENMASK(30, 16)
+#define MINOR_VERSION_MASK GENMASK(15, 0)
+#define GET_FFA_MAJOR_VERSION(x) \
+ ((u16)(FIELD_GET(MAJOR_VERSION_MASK, (x))))
+#define GET_FFA_MINOR_VERSION(x) \
+ ((u16)(FIELD_GET(MINOR_VERSION_MASK, (x))))
+#define PACK_VERSION_INFO(major, minor) \
+ (FIELD_PREP(MAJOR_VERSION_MASK, (major)) | \
+ FIELD_PREP(MINOR_VERSION_MASK, (minor)))
+
+#define FFA_MAJOR_VERSION (1)
+#define FFA_MINOR_VERSION (0)
+#define FFA_VERSION_1_0 \
+ PACK_VERSION_INFO(FFA_MAJOR_VERSION, FFA_MINOR_VERSION)
+
+/* Endpoint ID mask (u-boot endpoint ID) */
+
+#define GET_SELF_ENDPOINT_ID_MASK GENMASK(15, 0)
+#define GET_SELF_ENDPOINT_ID(x) \
+ ((u16)(FIELD_GET(GET_SELF_ENDPOINT_ID_MASK, (x))))
+
+#define PREP_SELF_ENDPOINT_ID_MASK GENMASK(31, 16)
+#define PREP_SELF_ENDPOINT_ID(x) \
+ (FIELD_PREP(PREP_SELF_ENDPOINT_ID_MASK, (x)))
+
+/* Partition endpoint ID mask (partition with which u-boot communicates with) */
+
+#define PREP_PART_ENDPOINT_ID_MASK GENMASK(15, 0)
+#define PREP_PART_ENDPOINT_ID(x) \
+ (FIELD_PREP(PREP_PART_ENDPOINT_ID_MASK, (x)))
+
+/*
+ * Definitions of the Arm FF-A interfaces supported by the Arm FF-A driver
+ */
+
+#define FFA_SMC(calling_convention, func_num) \
+ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, (calling_convention), \
+ ARM_SMCCC_OWNER_STANDARD, (func_num))
+
+#define FFA_SMC_32(func_num) FFA_SMC(ARM_SMCCC_SMC_32, (func_num))
+#define FFA_SMC_64(func_num) FFA_SMC(ARM_SMCCC_SMC_64, (func_num))
+
+#define FFA_VERSION FFA_SMC_32(0x63)
+#define FFA_ID_GET FFA_SMC_32(0x69)
+#define FFA_FEATURES FFA_SMC_32(0x64)
+#define FFA_PARTITION_INFO_GET FFA_SMC_32(0x68)
+#define FFA_RXTX_UNMAP FFA_SMC_32(0x67)
+#define FFA_RX_RELEASE FFA_SMC_32(0x65)
+#define FFA_RUN FFA_SMC_32(0x6D)
+#define FFA_ERROR FFA_SMC_32(0x60)
+#define FFA_SUCCESS FFA_SMC_32(0x61)
+#define FFA_INTERRUPT FFA_SMC_32(0x62)
+#define FFA_RXTX_MAP FFA_SMC_64(0x66)
+#define FFA_MSG_SEND_DIRECT_REQ FFA_SMC_64(0x6F)
+#define FFA_MSG_SEND_DIRECT_RESP FFA_SMC_64(0x70)
+
+/* The FF-A SMC function definitions */
+
+typedef struct arm_smccc_1_2_regs ffa_value_t;
+typedef void (*invoke_ffa_fn_t)(ffa_value_t args, ffa_value_t *res);
+
+/* FF-A error codes */
+#define FFA_ERR_STAT_NOT_SUPPORTED (-1)
+#define FFA_ERR_STAT_INVALID_PARAMETERS (-2)
+#define FFA_ERR_STAT_NO_MEMORY (-3)
+#define FFA_ERR_STAT_BUSY (-4)
+#define FFA_ERR_STAT_INTERRUPTED (-5)
+#define FFA_ERR_STAT_DENIED (-6)
+#define FFA_ERR_STAT_RETRY (-7)
+#define FFA_ERR_STAT_ABORTED (-8)
+
+/* UUID data size */
+#define UUID_SIZE (16)
+
+/*
+ * union ffa_partition_uuid - Data union hosting the UUID
+ * transmitted by FFA_PARTITION_INFO_GET
+ * @words: data structure giving 32-bit words access to the UUID data
+ * @bytes: data structure giving byte access to the UUID data
+ *
+ * The structure holds little-endian UUID data.
+ */
+union ffa_partition_uuid {
+ struct __packed words {
+ u32 a1; /* w1 */
+ u32 a2; /* w2 */
+ u32 a3; /* w3 */
+ u32 a4; /* w4 */
+ } words;
+ u8 bytes[UUID_SIZE];
+};
+
+/**
+ * struct ffa_features_desc - FF-A functions features
+ * @func_id: FF-A function
+ * @field1: features read from register w2
+ * @field2: features read from register w3
+ *
+ * Data structure describing the features of the FF-A functions queried by
+ * FFA_FEATURES
+ */
+struct ffa_features_desc {
+ u32 func_id;
+ u32 field1;
+ u64 field2;
+};
+
+/**
+ * enum ffa_rxtx_buf_sizes - minimum sizes supported
+ * for the RX/TX buffers
+ */
+enum ffa_rxtx_buf_sizes {
+ RXTX_4K,
+ RXTX_64K,
+ RXTX_16K
+};
+
+/*
+ * Number of the FF-A interfaces features descriptors
+ * currently only FFA_RXTX_MAP descriptor is supported
+ */
+#define FFA_FEATURE_DESC_CNT (1)
+
+/**
+ * struct ffa_rxtxpair - structure hosting the RX/TX buffers virtual addresses
+ * @rxbuf: virtual address of the RX buffer
+ * @txbuf: virtual address of the TX buffer
+ *
+ * Data structure hosting the virtual addresses of the mapped RX/TX buffers
+ * These addresses are used by the FF-A functions that use the RX/TX buffers
+ */
+struct ffa_rxtxpair {
+ u64 rxbuf; /* virtual address */
+ u64 txbuf; /* virtual address */
+};
+
+/**
+ * struct ffa_partition_desc - the secure partition descriptor
+ * @info: partition information
+ * @UUID: UUID
+ *
+ * Each partition has its descriptor containing the partitions information and the UUID
+ */
+struct ffa_partition_desc {
+ struct ffa_partition_info info;
+ union ffa_partition_uuid UUID;
+};
+
+/**
+ * struct ffa_partitions - descriptors for all secure partitions
+ * @count: The number of partitions descriptors
+ * @descs The partitions descriptors table
+ *
+ * This data structure contains the partitions descriptors table
+ */
+struct ffa_partitions {
+ u32 count;
+ struct ffa_partition_desc *descs; /* virtual address */
+};
+
+/**
+ * struct ffa_prvdata - the driver private data structure
+ *
+ * @dev: The arm_ffa device under u-boot driver model
+ * @ffa_ops: The driver operations structure
+ * @fwk_version: FF-A framework version
+ * @id: u-boot endpoint ID
+ * @partitions: The partitions descriptors structure
+ * @pair: The RX/TX buffers pair
+ * @invoke_ffa_fn: The function executing the FF-A function
+ * @features: Table of the FF-A functions having features
+ *
+ * The driver data structure hosting all resident data.
+ */
+struct ffa_prvdata {
+ struct udevice *dev;
+ struct ffa_bus_ops ffa_ops;
+ u32 fwk_version;
+ u16 id;
+ struct ffa_partitions partitions;
+ struct ffa_rxtxpair pair;
+ invoke_ffa_fn_t invoke_ffa_fn;
+ struct ffa_features_desc features[FFA_FEATURE_DESC_CNT];
+};
+
+/**
+ * ffa_device_get - create, bind and probe the arm_ffa device
+ */
+int ffa_device_get(void);
+
+/**
+ * ffa_bus_prvdata_get - bus driver private data getter
+ */
+struct ffa_prvdata **ffa_bus_prvdata_get(void);
+
+#endif
diff --git a/drivers/arm-ffa/core.c b/drivers/arm-ffa/core.c
new file mode 100644
index 0000000000..40d140fc3e
--- /dev/null
+++ b/drivers/arm-ffa/core.c
@@ -0,0 +1,1338 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2022 ARM Limited
+ * Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
+ */
+
+#include "arm_ffa_prv.h"
+#include <asm/global_data.h>
+#include <common.h>
+#include <dm.h>
+#include <dm/device-internal.h>
+#include <dm/devres.h>
+#include <dm/root.h>
+#include <linux/errno.h>
+#include <linux/sizes.h>
+#include <log.h>
+#include <malloc.h>
+#include <string.h>
+#include <uuid.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/**
+ * The device private data structure containing all the resident
+ * data read from secure world
+ */
+__ffa_runtime_data struct ffa_prvdata *ffa_priv_data;
+
+/*
+ * Driver functions
+ */
+
+/**
+ * ffa_remove_device - removes the arm_ffa device
+ * @dev: the device to be removed
+ *
+ * This boot time function makes sure the arm_ffa device is removed
+ * No need to free the kmalloced data when the device is destroyed.
+ * It's automatically done by devm management.
+ *
+ * Return:
+ *
+ * FFA_ERR_STAT_SUCCESS on success. Otherwise, failure
+ */
+int ffa_remove_device(struct udevice *dev)
+{
+ int ret;
+
+ if (!dev)
+ return -ENODEV;
+
+ ret = device_remove(dev, DM_REMOVE_NORMAL);
+ if (ret) {
+ ffa_err("Unable to remove. err:%d\n", ret);
+ return ret;
+ }
+
+ ret = device_unbind(dev);
+ if (ret) {
+ ffa_err("Unable to unbind. err:%d\n", ret);
+ return ret;
+ }
+
+ return FFA_ERR_STAT_SUCCESS;
+}
+
+/**
+ * ffa_device_get - create, bind and probe the arm_ffa device
+ *
+ * This boot time function makes sure the arm_ffa device is
+ * created, bound to this driver, probed and ready to use.
+ * Arm FF-A transport is implemented through a single u-boot
+ * device managing the FF-A bus (arm_ffa).
+ *
+ * Return:
+ *
+ * FFA_ERR_STAT_SUCCESS on success. Otherwise, failure
+ */
+int ffa_device_get(void)
+{
+ int ret;
+ struct udevice *dev = NULL;
+
+ if (ffa_priv_data && ffa_priv_data->dev)
+ return FFA_ERR_STAT_SUCCESS;
+
+ ret = device_bind(dm_root(),
+ DM_DRIVER_GET(arm_ffa),
+ FFA_DRV_NAME,
+ NULL,
+ ofnode_null(),
+ &dev);
+ if (ret)
+ return ret;
+
+ /* The FF-A bus discovery succeeds when probing is successful */
+ ret = device_probe(dev);
+ if (ret) {
+ ffa_err("arm_ffa device probing failed");
+ ffa_remove_device(dev);
+ return ret;
+ }
+
+ return FFA_ERR_STAT_SUCCESS;
+}
+
+/**
+ * ffa_get_version - FFA_VERSION handler function
+ *
+ * This is the boot time function that implements FFA_VERSION FF-A function
+ * to get from the secure world the FF-A framework version
+ *
+ * Return:
+ *
+ * FFA_ERR_STAT_SUCCESS on success. Otherwise, failure
+ */
+static int ffa_get_version(void)
+{
+ u16 major, minor;
+ ffa_value_t res = {0};
+
+ if (!ffa_priv_data->invoke_ffa_fn)
+ panic("[FFA] no private data found\n");
+
+ ffa_priv_data->invoke_ffa_fn((ffa_value_t){
+ .a0 = FFA_VERSION,
+ .a1 = FFA_VERSION_1_0, .a2 = 0, .a3 = 0, .a4 = 0, .a5 = 0, .a6 = 0, .a7 = 0,
+ }, &res);
+
+ if (((int)res.a0) == FFA_ERR_STAT_NOT_SUPPORTED) {
+ ffa_err("A Firmware Framework implementation does not exist");
+ return -EOPNOTSUPP;
+ }
+
+ major = GET_FFA_MAJOR_VERSION((u32)res.a0);
+ minor = GET_FFA_MINOR_VERSION((u32)res.a0);
+
+ ffa_info("FF-A driver %d.%d\nFF-A framework %d.%d",
+ FFA_MAJOR_VERSION, FFA_MINOR_VERSION, major, minor);
+
+ if ((major == FFA_MAJOR_VERSION && minor >= FFA_MINOR_VERSION)) {
+ ffa_info("Versions are compatible ");
+
+ ffa_priv_data->fwk_version = (u32)res.a0;
+
+ return FFA_ERR_STAT_SUCCESS;
+ }
+
+ ffa_err("Versions are incompatible\nExpected: %d.%d , Found: %d.%d\n",
+ FFA_MAJOR_VERSION, FFA_MINOR_VERSION, major, minor);
+
+ return -EPROTONOSUPPORT;
+}
+
+/**
+ * ffa_get_endpoint_id - FFA_ID_GET handler function
+ *
+ * This is the boot time function that implements FFA_ID_GET FF-A function
+ * to get from the secure world u-boot endpoint ID
+ *
+ * Return:
+ *
+ * FFA_ERR_STAT_SUCCESS on success. Otherwise, failure
+ */
+static int ffa_get_endpoint_id(void)
+{
+ ffa_value_t res = {0};
+
+ if (!ffa_priv_data->invoke_ffa_fn)
+ panic("[FFA] no private data found\n");
+
+ ffa_priv_data->invoke_ffa_fn((ffa_value_t){
+ .a0 = FFA_ID_GET,
+ .a1 = 0, .a2 = 0, .a3 = 0, .a4 = 0, .a5 = 0, .a6 = 0, .a7 = 0,
+ }, &res);
+
+ switch (res.a0) {
+ case FFA_ERROR:
+
+ if (((int)res.a2) == FFA_ERR_STAT_NOT_SUPPORTED) {
+ ffa_err("This function is not implemented at this FF-A instance");
+ return -EOPNOTSUPP;
+ }
+
+ ffa_err("Undefined error code (%d)", ((int)res.a2));
+ return -EINVAL;
+
+ case FFA_SUCCESS:
+
+ ffa_priv_data->id = GET_SELF_ENDPOINT_ID((u32)res.a2);
+ ffa_info("endpoint ID is %u", ffa_priv_data->id);
+
+ return FFA_ERR_STAT_SUCCESS;
+
+ default:
+
+ ffa_err("Undefined response function (0x%lx)", res.a0);
+ return -EINVAL;
+ }
+}
+
+/**
+ * ffa_get_features_desc - returns the features descriptor of the specified
+ * FF-A function
+ * @func_id: the FF-A function which the features are to be retrieved
+ *
+ * This is a boot time function that searches the features descriptor of the
+ * specified FF-A function
+ *
+ * Return:
+ *
+ * When found, the address of the features descriptor is returned. Otherwise, NULL.
+ */
+static struct ffa_features_desc *ffa_get_features_desc(u32 func_id)
+{
+ u32 desc_idx;
+
+ /*
+ * search for the descriptor of the selected FF-A interface
+ */
+ for (desc_idx = 0; desc_idx < FFA_FEATURE_DESC_CNT ; desc_idx++)
+ if (ffa_priv_data->features[desc_idx].func_id == func_id)
+ return &ffa_priv_data->features[desc_idx];
+
+ return NULL;
+}
+
+/**
+ * ffa_get_rxtx_map_features - FFA_FEATURES handler function with FFA_RXTX_MAP
+ * argument
+ *
+ * This is the boot time function that implements FFA_FEATURES FF-A function
+ * to retrieve the FFA_RXTX_MAP features
+ *
+ * Return:
+ *
+ * FFA_ERR_STAT_SUCCESS on success. Otherwise, failure
+ */
+static int ffa_get_rxtx_map_features(void)
+{
+ ffa_value_t res = {0};
+
+ if (!ffa_priv_data->invoke_ffa_fn)
+ panic("[FFA] no private data found\n");
+
+ ffa_priv_data->invoke_ffa_fn((ffa_value_t){
+ .a0 = FFA_FEATURES,
+ .a1 = FFA_RXTX_MAP,
+ .a2 = 0, .a3 = 0, .a4 = 0, .a5 = 0, .a6 = 0, .a7 = 0,
+ }, &res);
+
+ switch (res.a0) {
+ case FFA_ERROR:
+ {
+ if (((int)res.a2) == FFA_ERR_STAT_NOT_SUPPORTED) {
+ ffa_err("FFA_RXTX_MAP is not implemented at this FF-A instance");
+ return -EOPNOTSUPP;
+ }
+
+ ffa_err("Undefined error code (%d)", ((int)res.a2));
+ return -EINVAL;
+ }
+ case FFA_SUCCESS:
+ {
+ u32 desc_idx;
+
+ /*
+ * search for an empty descriptor
+ */
+ for (desc_idx = 0; desc_idx < FFA_FEATURE_DESC_CNT ; desc_idx++)
+ if (!ffa_priv_data->features[desc_idx].func_id) {
+ /*
+ * populate the descriptor with
+ * the interface features data
+ */
+ ffa_priv_data->features[desc_idx].func_id =
+ FFA_RXTX_MAP;
+ ffa_priv_data->features[desc_idx].field1 =
+ (u32)res.a2;
+
+ ffa_info("FFA_RXTX_MAP features data 0x%x",
+ ffa_priv_data->features[desc_idx].field1);
+
+ return FFA_ERR_STAT_SUCCESS;
+ }
+
+ ffa_err("Cannot save FFA_RXTX_MAP features data. Descriptors table full");
+ return -ENOBUFS;
+ }
+ default:
+ {
+ ffa_err("Undefined response function (0x%lx)",
+ res.a0);
+ return -EINVAL;
+ }
+ }
+}
+
+/**
+ * ffa_get_rxtx_buffers_pages_cnt - reads from the features data descriptors
+ * the minimum number of pages in each of the RX/TX
+ * buffers
+ * @buf_4k_pages: Pointer to the minimum number of pages
+ *
+ * This is the boot time function that returns the minimum number of pages
+ * in each of the RX/TX buffers
+ *
+ * Return:
+ *
+ * buf_4k_pages points to the returned number of pages
+ * FFA_ERR_STAT_SUCCESS on success. Otherwise, failure
+ */
+static int ffa_get_rxtx_buffers_pages_cnt(size_t *buf_4k_pages)
+{
+ struct ffa_features_desc *desc = NULL;
+
+ if (!buf_4k_pages)
+ return -EINVAL;
+
+ desc = ffa_get_features_desc(FFA_RXTX_MAP);
+ if (!desc)
+ return -EINVAL;
+
+ switch (desc->field1) {
+ case RXTX_4K:
+ *buf_4k_pages = 1;
+ break;
+ case RXTX_16K:
+ *buf_4k_pages = 4;
+ break;
+ case RXTX_64K:
+ *buf_4k_pages = 16;
+ break;
+ default:
+ ffa_err("RX/TX buffer size not supported");
+ return -EINVAL;
+ }
+
+ return FFA_ERR_STAT_SUCCESS;
+}
+
+/**
+ * ffa_free_rxtx_buffers - frees the RX/TX buffers
+ * @buf_4k_pages: the minimum number of pages in each of the RX/TX
+ * buffers
+ *
+ * This is the boot time function used to free the RX/TX buffers
+ *
+ */
+static void ffa_free_rxtx_buffers(void)
+{
+ ffa_info("Freeing RX/TX buffers");
+
+ if (ffa_priv_data->pair.rxbuf) {
+ free((void *)ffa_priv_data->pair.rxbuf);
+ ffa_priv_data->pair.rxbuf = 0;
+ }
+
+ if (ffa_priv_data->pair.txbuf) {
+ free((void *)ffa_priv_data->pair.txbuf);
+ ffa_priv_data->pair.txbuf = 0;
+ }
+}
+
+/**
+ * ffa_alloc_rxtx_buffers - allocates the RX/TX buffers
+ * @buf_4k_pages: the minimum number of pages in each of the RX/TX
+ * buffers
+ *
+ * This is the boot time function used by ffa_map_rxtx_buffers to allocate
+ * the RX/TX buffers before mapping them. The allocated memory is physically
+ * contiguous since memalign ends up calling malloc which allocates
+ * contiguous memory in u-boot.
+ *
+ * Return:
+ *
+ * FFA_ERR_STAT_SUCCESS on success. Otherwise, failure
+ */
+static int ffa_alloc_rxtx_buffers(size_t buf_4k_pages)
+{
+ u64 bytes;
+
+ ffa_info("Using %lu 4KB page(s) for RX/TX buffers size", buf_4k_pages);
+
+ bytes = buf_4k_pages * SZ_4K;
+
+ /* RX/TX buffers addresses should be PAGE_SIZE aligned */
+
+ ffa_priv_data->pair.rxbuf = (u64)memalign(PAGE_SIZE, bytes);
+ if (!ffa_priv_data->pair.rxbuf) {
+ ffa_err("Failure to allocate RX buffer");
+ return -ENOBUFS;
+ }
+
+ ffa_info("RX buffer at virtual address 0x%llx", ffa_priv_data->pair.rxbuf);
+
+ ffa_priv_data->pair.txbuf = (u64)memalign(PAGE_SIZE, bytes);
+ if (!ffa_priv_data->pair.txbuf) {
+ free((void *)ffa_priv_data->pair.rxbuf);
+ ffa_priv_data->pair.rxbuf = 0;
+ ffa_err("Failure to allocate the TX buffer");
+ return -ENOBUFS;
+ }
+
+ ffa_info("TX buffer at virtual address 0x%llx", ffa_priv_data->pair.txbuf);
+
+ /*
+ * make sure the buffers are cleared before use
+ */
+ memset((void *)ffa_priv_data->pair.rxbuf, 0, bytes);
+ memset((void *)ffa_priv_data->pair.txbuf, 0, bytes);
+
+ return FFA_ERR_STAT_SUCCESS;
+}
+
+/**
+ * ffa_map_rxtx_buffers - FFA_RXTX_MAP handler function
+ * @buf_4k_pages: the minimum number of pages in each of the RX/TX
+ * buffers
+ *
+ * This is the boot time function that implements FFA_RXTX_MAP FF-A function
+ * to map the RX/TX buffers
+ *
+ * Return:
+ *
+ * FFA_ERR_STAT_SUCCESS on success. Otherwise, failure
+ */
+static int ffa_map_rxtx_buffers(size_t buf_4k_pages)
+{
+ int ret;
+ ffa_value_t res = {0};
+
+ if (!ffa_priv_data->invoke_ffa_fn)
+ panic("[FFA] no private data found\n");
+
+ ret = ffa_alloc_rxtx_buffers(buf_4k_pages);
+ if (ret != FFA_ERR_STAT_SUCCESS)
+ return ret;
+
+ /*
+ * we need to pass the physical addresses of the RX/TX buffers
+ * in u-boot physical/virtual mapping is 1:1
+ *no need to convert from virtual to physical
+ */
+
+ ffa_priv_data->invoke_ffa_fn((ffa_value_t){
+ .a0 = FFA_RXTX_MAP,
+ .a1 = ffa_priv_data->pair.txbuf,
+ .a2 = ffa_priv_data->pair.rxbuf,
+ .a3 = buf_4k_pages,
+ .a4 = 0, .a5 = 0, .a6 = 0, .a7 = 0,
+ }, &res);
+
+ switch (res.a0) {
+ case FFA_ERROR:
+ {
+ switch (((int)res.a2)) {
+ case FFA_ERR_STAT_INVALID_PARAMETERS:
+ ffa_err("One or more fields in input parameters is incorrectly encoded");
+ ret = -EPERM;
+ break;
+ case FFA_ERR_STAT_NO_MEMORY:
+ ffa_err("Not enough memory");
+ ret = -ENOMEM;
+ break;
+ case FFA_ERR_STAT_DENIED:
+ ffa_err("Buffer pair already registered");
+ ret = -EACCES;
+ break;
+ case FFA_ERR_STAT_NOT_SUPPORTED:
+ ffa_err("This function is not implemented at this FF-A instance");
+ ret = -EOPNOTSUPP;
+ break;
+ default:
+ ffa_err("Undefined error (%d)",
+ ((int)res.a2));
+ ret = -EINVAL;
+ }
+ break;
+ }
+ case FFA_SUCCESS:
+ ffa_info("RX/TX buffers mapped");
+ return FFA_ERR_STAT_SUCCESS;
+ default:
+ ffa_err("Undefined response function (0x%lx)",
+ res.a0);
+ ret = -EINVAL;
+ }
+
+ ffa_free_rxtx_buffers();
+
+ return ret;
+}
+
+/**
+ * ffa_unmap_rxtx_buffers - FFA_RXTX_UNMAP handler function
+ *
+ * This is the boot time function that implements FFA_RXTX_UNMAP FF-A function
+ * to unmap the RX/TX buffers
+ *
+ * Return:
+ *
+ * FFA_ERR_STAT_SUCCESS on success. Otherwise, failure
+ */
+static int ffa_unmap_rxtx_buffers(void)
+{
+ ffa_value_t res = {0};
+
+ if (!ffa_priv_data->invoke_ffa_fn)
+ panic("[FFA] no private data found\n");
+
+ ffa_priv_data->invoke_ffa_fn((ffa_value_t){
+ .a0 = FFA_RXTX_UNMAP,
+ .a1 = PREP_SELF_ENDPOINT_ID(ffa_priv_data->id),
+ .a2 = 0, .a3 = 0, .a4 = 0, .a5 = 0, .a6 = 0, .a7 = 0,
+ }, &res);
+
+ switch (res.a0) {
+ case FFA_ERROR:
+ {
+ if (((int)res.a2) == FFA_ERR_STAT_NOT_SUPPORTED)
+ panic("[FFA] FFA_RXTX_UNMAP is not implemented at this FF-A instance\n");
+ else if (((int)res.a2) == FFA_ERR_STAT_INVALID_PARAMETERS)
+ panic("[FFA] There is no buffer pair registered on behalf of the caller\n");
+ else
+ panic("[FFA] Undefined error (%d)\n", ((int)res.a2));
+ }
+ case FFA_SUCCESS:
+ {
+ ffa_free_rxtx_buffers();
+
+ return FFA_ERR_STAT_SUCCESS;
+ }
+ default:
+ panic("[FFA] Undefined response function (0x%lx)", res.a0);
+ return -ENODEV;
+ }
+}
+
+/**
+ * ffa_release_rx_buffer - FFA_RX_RELEASE handler function
+ *
+ * This is the boot time function that invokes FFA_RX_RELEASE FF-A function
+ * to release the ownership of the RX buffer
+ *
+ * Return:
+ *
+ * FFA_ERR_STAT_SUCCESS on success. Otherwise, failure
+ */
+static int ffa_release_rx_buffer(void)
+{
+ ffa_value_t res = {0};
+
+ if (!ffa_priv_data->invoke_ffa_fn)
+ panic("[FFA] no private data found\n");
+
+ ffa_priv_data->invoke_ffa_fn((ffa_value_t){
+ .a0 = FFA_RX_RELEASE,
+ .a1 = 0, .a2 = 0, .a3 = 0, .a4 = 0, .a5 = 0, .a6 = 0, .a7 = 0,
+ }, &res);
+
+ switch (res.a0) {
+ case FFA_ERROR:
+ {
+ if (((int)res.a2) == FFA_ERR_STAT_NOT_SUPPORTED)
+ panic("[FFA] FFA_RX_RELEASE is not implemented at this FF-A instance\n");
+ else if (((int)res.a2) == FFA_ERR_STAT_DENIED)
+ panic("[FFA] Caller did not have ownership of the RX buffer\n");
+ else
+ panic("[FFA] Undefined error (%d)\n", ((int)res.a2));
+ }
+ case FFA_SUCCESS:
+ return FFA_ERR_STAT_SUCCESS;
+
+ default:
+ panic("[FFA] Undefined response function (0x%lx)\n", res.a0);
+ return -ENODEV;
+ }
+}
+
+/**
+ * ffa_uuid_are_identical - checks whether two given UUIDs are identical
+ * @uuid1: first UUID
+ * @uuid2: second UUID
+ *
+ * This is a boot time function used by ffa_read_partitions_info to search
+ * for a UUID in the partitions descriptors table
+ *
+ * Return:
+ *
+ * 1 when UUIDs match. Otherwise, 0
+ */
+int ffa_uuid_are_identical(const union ffa_partition_uuid *uuid1,
+ const union ffa_partition_uuid *uuid2)
+{
+ if (!uuid1 || !uuid2)
+ return 0;
+
+ return (!memcmp(uuid1, uuid2, sizeof(union ffa_partition_uuid)));
+}
+
+/**
+ * ffa_read_partitions_info - reads the data queried by FFA_PARTITION_INFO_GET
+ * and saves it in the private structure
+ * @count: The number of partitions queried
+ * @part_uuid: Pointer to the partition(s) UUID
+ *
+ * This is the boot time function that reads the partitions information
+ * returned by the FFA_PARTITION_INFO_GET and saves it in the private
+ * data structure.
+ *
+ * Return:
+ *
+ * The private data structure is updated with the partition(s) information
+ * FFA_ERR_STAT_SUCCESS is returned on success. Otherwise, failure
+ */
+static int ffa_read_partitions_info(u32 count, union ffa_partition_uuid *part_uuid)
+{
+ if (!count) {
+ ffa_err("No partition detected");
+ return -ENODATA;
+ }
+
+ ffa_info("Reading partitions data from the RX buffer");
+
+ if (!part_uuid) {
+ /*
+ * querying information of all partitions
+ */
+ u64 buf_bytes;
+ u64 data_bytes;
+ size_t buf_4k_pages = 0;
+ u32 desc_idx;
+ struct ffa_partition_info *parts_info;
+ int ret;
+
+ data_bytes = count * sizeof(struct ffa_partition_desc);
+
+ /*
+ * get the RX buffer size in pages
+ */
+ ret = ffa_get_rxtx_buffers_pages_cnt(&buf_4k_pages);
+ if (ret != FFA_ERR_STAT_SUCCESS) {
+ ffa_err("Can not get the RX buffer size (error %d)", ret);
+ return ret;
+ }
+
+ buf_bytes = buf_4k_pages * SZ_4K;
+
+ if (data_bytes > buf_bytes) {
+ ffa_err("Partitions data size exceeds the RX buffer size:");
+ ffa_err(" Sizes in bytes: data %llu , RX buffer %llu ",
+ data_bytes,
+ buf_bytes);
+
+ return -ENOMEM;
+ }
+
+ ffa_priv_data->partitions.descs = (struct ffa_partition_desc *)
+ devm_kmalloc(ffa_priv_data->dev, data_bytes, __GFP_ZERO);
+ if (!ffa_priv_data->partitions.descs) {
+ ffa_err("Cannot allocate partitions data buffer");
+ return -ENOMEM;
+ }
+
+ parts_info = (struct ffa_partition_info *)ffa_priv_data->pair.rxbuf;
+
+ for (desc_idx = 0 ; desc_idx < count ; desc_idx++) {
+ ffa_priv_data->partitions.descs[desc_idx].info =
+ parts_info[desc_idx];
+
+ ffa_info("Partition ID %x : info cached",
+ ffa_priv_data->partitions.descs[desc_idx].info.id);
+ }
+
+ ffa_priv_data->partitions.count = count;
+
+ ffa_info("%d partition(s) found and cached", count);
+
+ } else {
+ u32 rx_desc_idx, cached_desc_idx;
+ struct ffa_partition_info *parts_info;
+ u8 desc_found;
+
+ parts_info = (struct ffa_partition_info *)ffa_priv_data->pair.rxbuf;
+
+ /*
+ * search for the SP IDs read from the RX buffer
+ * in the already cached SPs.
+ * Update the UUID when ID found.
+ */
+ for (rx_desc_idx = 0; rx_desc_idx < count ; rx_desc_idx++) {
+ desc_found = 0;
+
+ /*
+ * search the current ID in the cached partitions
+ */
+ for (cached_desc_idx = 0;
+ cached_desc_idx < ffa_priv_data->partitions.count;
+ cached_desc_idx++) {
+ /*
+ * save the UUID
+ */
+ if (ffa_priv_data->partitions.descs[cached_desc_idx].info.id ==
+ parts_info[rx_desc_idx].id) {
+ ffa_priv_data->partitions.descs[cached_desc_idx].UUID =
+ *part_uuid;
+
+ desc_found = 1;
+ break;
+ }
+ }
+
+ if (!desc_found)
+ return -ENODATA;
+ }
+ }
+
+ return FFA_ERR_STAT_SUCCESS;
+}
+
+/**
+ * ffa_query_partitions_info - invokes FFA_PARTITION_INFO_GET and saves partitions data
+ *
+ * @part_uuid: Pointer to the partition(s) UUID
+ * @pcount: Pointer to the number of partitions variable filled when querying
+ *
+ * This is the boot time function that executes the FFA_PARTITION_INFO_GET
+ * to query the partitions data. Then, it calls ffa_read_partitions_info
+ * to save the data in the private data structure.
+ *
+ * After reading the data the RX buffer is released using ffa_release_rx_buffer
+ *
+ * Return:
+ *
+ * When part_uuid is NULL, all partitions data are retrieved from secure world
+ * When part_uuid is non NULL, data for partitions matching the given UUID are
+ * retrieved and the number of partitions is returned
+ * FFA_ERR_STAT_SUCCESS is returned on success. Otherwise, failure
+ */
+static int ffa_query_partitions_info(union ffa_partition_uuid *part_uuid,
+ u32 *pcount)
+{
+ union ffa_partition_uuid query_uuid = {0};
+ ffa_value_t res = {0};
+
+ if (!ffa_priv_data->invoke_ffa_fn)
+ panic("[FFA] no private data found\n");
+
+ /*
+ * If a UUID is specified. Information for one or more
+ * partitions in the system is queried. Otherwise, information
+ * for all installed partitions is queried
+ */
+
+ if (part_uuid) {
+ if (!pcount)
+ return -EINVAL;
+
+ query_uuid = *part_uuid;
+ }
+
+ ffa_priv_data->invoke_ffa_fn((ffa_value_t){
+ .a0 = FFA_PARTITION_INFO_GET,
+ .a1 = query_uuid.words.a1,
+ .a2 = query_uuid.words.a2,
+ .a3 = query_uuid.words.a3,
+ .a4 = query_uuid.words.a4,
+ .a5 = 0,
+ .a6 = 0,
+ .a7 = 0,
+ }, &res);
+
+ switch (res.a0) {
+ case FFA_ERROR:
+ {
+ switch (((int)res.a2)) {
+ case FFA_ERR_STAT_INVALID_PARAMETERS:
+ ffa_err("Unrecognized UUID");
+ return -EPERM;
+ case FFA_ERR_STAT_NO_MEMORY:
+ ffa_err("Results cannot fit in RX buffer of the caller");
+ return -ENOMEM;
+ case FFA_ERR_STAT_DENIED:
+ ffa_err("Callee is not in a state to handle this request");
+ return -EACCES;
+ case FFA_ERR_STAT_NOT_SUPPORTED:
+ ffa_err("This function is not implemented at this FF-A instance");
+ return -EOPNOTSUPP;
+ case FFA_ERR_STAT_BUSY:
+ ffa_err("RX buffer of the caller is not free");
+ return -EBUSY;
+ default:
+ ffa_err("Undefined error (%d)", ((int)res.a2));
+ return -EINVAL;
+ }
+ }
+ case FFA_SUCCESS:
+ {
+ int ret;
+
+ /*
+ * res.a2 contains the count of partition information descriptors
+ * populated in the RX buffer
+ */
+ if (res.a2) {
+ ret = ffa_read_partitions_info((u32)res.a2, part_uuid);
+ if (ret)
+ ffa_err("Failed to read partition(s) data , error (%d)", ret);
+ }
+
+ /*
+ * return the SP count
+ */
+ if (part_uuid) {
+ if (!ret)
+ *pcount = (u32)res.a2;
+ else
+ *pcount = 0;
+ }
+ /*
+ * After calling FFA_PARTITION_INFO_GET the buffer ownership
+ * is assigned to the consumer (u-boot). So, we need to give
+ * the ownership back to the SPM or hypervisor
+ */
+ ret = ffa_release_rx_buffer();
+
+ if (!part_uuid && !res.a2) {
+ ffa_err("[FFA] no partition installed in the system");
+ return -ENODEV;
+ }
+
+ return ret;
+ }
+ default:
+ ffa_err("Undefined response function (0x%lx)", res.a0);
+ return -EINVAL;
+ }
+}
+
+/**
+ * ffa_get_partitions_info - FFA_PARTITION_INFO_GET handler function
+ *
+ * The passed arguments:
+ * Mode 1: When getting from the driver the number of
+ * secure partitions:
+ * @uuid_str: pointer to the UUID string
+ * @parts_size: pointer to the variable that contains the number of partitions
+ * The variable will be set by the driver
+ * @buffer: NULL
+ *
+ * Mode 2: When requesting the driver to return the
+ * partitions information:
+ * @uuid_str: pointer to the UUID string
+ * @parts_size: pointer to the size of the SPs information buffer in bytes
+ * @buffer: pointer to SPs information buffer
+ * (allocated by the client).
+ * The buffer will be filled by the driver
+ *
+ * This is the boot time function that queries the secure partition data from
+ * the private data structure. If not found, it invokes FFA_PARTITION_INFO_GET
+ * FF-A function to query the partition information from secure world.
+ *
+ * A client of the FF-A driver should know the UUID of the service it wants to
+ * access. It should use the UUID to request the FF-A driver to provide the
+ * partition(s) information of the service. The FF-A driver uses
+ * PARTITION_INFO_GET to obtain this information. This is implemented through
+ * ffa_get_partitions_info function.
+ * A new FFA_PARTITION_INFO_GET call is issued (first one performed through
+ * ffa_cache_partitions_info) allowing to retrieve the partition(s) information.
+ * They are not saved (already done). We only update the UUID in the cached area.
+ * This assumes that partitions data does not change in the secure world.
+ * Otherwise u-boot will have an outdated partition data. The benefit of caching
+ * the information in the FF-A driver is to accommodate discovery after
+ * ExitBootServices().
+ *
+ * When invoked through a client request, ffa_get_partitions_info should be
+ * called twice. First call is to get from the driver the number of secure
+ * partitions (SPs) associated to a particular UUID.
+ * Then, the caller (client) allocates the buffer to host the SPs data and
+ * issues a 2nd call. Then, the driver fills the SPs data in the pre-allocated
+ * buffer.
+ *
+ * To achieve the mechanism described above, ffa_get_partitions_info uses the
+ * following functions:
+ * ffa_read_partitions_info
+ * ffa_query_partitions_info
+ *
+ * Return:
+ *
+ * @parts_size: When pointing to the number of partitions variable, the number is
+ * set by the driver.
+ * When pointing to the partitions information buffer size, the buffer will be
+ * filled by the driver.
+ *
+ * On success FFA_ERR_STAT_SUCCESS is returned. Otherwise, failure
+ */
+static int ffa_get_partitions_info(const char *uuid_str,
+ u32 *parts_size, struct ffa_partition_info *buffer)
+{
+ /*
+ * fill_data:
+ * 0: return the SP count
+ * 1: fill SP data and return it to the caller
+ * -1: undefined mode
+ */
+ int fill_data = -1;
+ u32 desc_idx, client_desc_idx;
+ union ffa_partition_uuid part_uuid = {0};
+ u32 client_desc_max_cnt;
+ u32 parts_found = 0;
+
+ if (!ffa_priv_data->partitions.count || !ffa_priv_data->partitions.descs)
+ panic("[FFA] No partition installed\n");
+
+ if (!uuid_str) {
+ ffa_err("No UUID provided");
+ return -EINVAL;
+ }
+
+ if (!parts_size) {
+ ffa_err("No size/count provided");
+ return -EINVAL;
+ }
+
+ if (ffa_uuid_str_to_bin(uuid_str, (unsigned char *)&part_uuid)) {
+ ffa_err("Invalid UUID");
+ return -EINVAL;
+ }
+
+ if (!buffer) {
+ /* Mode 1: getting the number of secure partitions */
+
+ fill_data = 0;
+
+ ffa_info("Preparing for checking partitions count");
+
+ } else if ((*parts_size >= sizeof(struct ffa_partition_info)) &&
+ !(*parts_size % sizeof(struct ffa_partition_info))) {
+ /* Mode 2: retrieving the partitions information */
+
+ fill_data = 1;
+
+ client_desc_idx = 0;
+
+ /*
+ * number of empty descriptors preallocated by the caller
+ */
+ client_desc_max_cnt = *parts_size / sizeof(struct ffa_partition_info);
+
+ ffa_info("Preparing for filling partitions info");
+
+ } else {
+ ffa_err("Invalid function arguments provided");
+ return -EINVAL;
+ }
+
+ ffa_info("Searching partitions using the provided UUID");
+
+ /*
+ * search in the cached partitions
+ */
+ for (desc_idx = 0;
+ desc_idx < ffa_priv_data->partitions.count;
+ desc_idx++) {
+ if (ffa_uuid_are_identical(&ffa_priv_data->partitions.descs[desc_idx].UUID,
+ &part_uuid)) {
+ ffa_info("Partition ID %x matches the provided UUID",
+ ffa_priv_data->partitions.descs[desc_idx].info.id);
+
+ parts_found++;
+
+ if (fill_data) {
+ /*
+ * trying to fill the partition info in the input buffer
+ */
+
+ if (client_desc_idx < client_desc_max_cnt) {
+ buffer[client_desc_idx++] =
+ ffa_priv_data->partitions.descs[desc_idx].info;
+ continue;
+ }
+
+ ffa_err("Failed to fill the current descriptor client buffer full");
+ return -ENOBUFS;
+ }
+ }
+ }
+
+ if (!parts_found) {
+ int ret;
+
+ ffa_info("No partition found. Querying framework ...");
+
+ ret = ffa_query_partitions_info(&part_uuid, &parts_found);
+
+ if (ret == FFA_ERR_STAT_SUCCESS) {
+ if (!fill_data) {
+ *parts_size = parts_found;
+
+ ffa_info("Number of partition(s) found matching the UUID: %d",
+ parts_found);
+ } else {
+ /*
+ * If SPs data detected, they are already in the private data
+ * structure, retry searching SP data again to return them
+ * to the caller
+ */
+ if (parts_found)
+ ret = ffa_get_partitions_info(uuid_str, parts_size, buffer);
+ else
+ ret = -ENODATA;
+ }
+ }
+
+ return ret;
+ }
+
+ /* partition(s) found */
+ if (!fill_data)
+ *parts_size = parts_found;
+
+ return FFA_ERR_STAT_SUCCESS;
+}
+
+/**
+ * ffa_cache_partitions_info - Queries and saves all secure partitions data
+ *
+ * This is a boot time function that invokes FFA_PARTITION_INFO_GET FF-A
+ * function to query from secure world all partitions information.
+ *
+ * The FFA_PARTITION_INFO_GET call is issued with nil UUID as an argument.
+ * All installed partitions information are returned. We cache them in the
+ * resident private data structure and we keep the UUID field empty
+ * (in FF-A 1.0 UUID is not provided by the partition descriptor)
+ *
+ * This function is called at the device probing level.
+ * ffa_cache_partitions_info uses ffa_query_partitions_info to get the data
+ *
+ * Return:
+ *
+ * FFA_ERR_STAT_SUCCESS on success. Otherwise, failure
+ */
+static int ffa_cache_partitions_info(void)
+{
+ return ffa_query_partitions_info(NULL, NULL);
+}
+
+/**
+ * ffa_msg_send_direct_req - FFA_MSG_SEND_DIRECT_{REQ,RESP} handler function
+ * @dst_part_id: destination partition ID
+ * @msg: pointer to the message data preallocated by the client (in/out)
+ *
+ * This is the runtime function that implements FFA_MSG_SEND_DIRECT_{REQ,RESP}
+ * FF-A functions.
+ *
+ * FFA_MSG_SEND_DIRECT_REQ is used to send the data to the secure partition.
+ * The response from the secure partition is handled by reading the
+ * FFA_MSG_SEND_DIRECT_RESP arguments.
+ *
+ * The maximum size of the data that can be exchanged is 40 bytes which is
+ * sizeof(struct ffa_send_direct_data) as defined by the FF-A specification 1.0
+ * in the section relevant to FFA_MSG_SEND_DIRECT_{REQ,RESP}
+ *
+ * Return:
+ *
+ * FFA_ERR_STAT_SUCCESS on success. Otherwise, failure
+ */
+static int __ffa_runtime ffa_msg_send_direct_req(u16 dst_part_id, struct ffa_send_direct_data *msg)
+{
+ ffa_value_t res = {0};
+
+ if (!ffa_priv_data->invoke_ffa_fn)
+ return -ENODEV;
+
+ /* No partition installed */
+ if (!ffa_priv_data->partitions.count || !ffa_priv_data->partitions.descs)
+ return -ENODEV;
+
+ ffa_priv_data->invoke_ffa_fn((ffa_value_t){
+ .a0 = FFA_MSG_SEND_DIRECT_REQ,
+ .a1 = PREP_SELF_ENDPOINT_ID(ffa_priv_data->id) |
+ PREP_PART_ENDPOINT_ID(dst_part_id),
+ .a2 = 0,
+ .a3 = msg->data0,
+ .a4 = msg->data1,
+ .a5 = msg->data2,
+ .a6 = msg->data3,
+ .a7 = msg->data4,
+ }, &res);
+
+ while (res.a0 == FFA_INTERRUPT)
+ ffa_priv_data->invoke_ffa_fn((ffa_value_t){
+ .a0 = FFA_RUN,
+ .a1 = res.a1, .a2 = 0, .a3 = 0, .a4 = 0, .a5 = 0, .a6 = 0, .a7 = 0,
+ }, &res);
+
+ switch (res.a0) {
+ case FFA_ERROR:
+ {
+ switch (((int)res.a2)) {
+ case FFA_ERR_STAT_INVALID_PARAMETERS:
+ /* Invalid endpoint ID or non-zero reserved register */
+ return -EPERM;
+ case FFA_ERR_STAT_ABORTED:
+ /* Message target ran into unexpected error and has aborted */
+ return -ECONNABORTED;
+ case FFA_ERR_STAT_DENIED:
+ /* Callee is not in a state to handle this request */
+ return -EACCES;
+ case FFA_ERR_STAT_NOT_SUPPORTED:
+ /* This function is not implemented at this FF-A instance */
+ return -EOPNOTSUPP;
+ case FFA_ERR_STAT_BUSY:
+ /* Message target is busy */
+ return -EBUSY;
+ default:
+ /* Undefined error */
+ return -ENXIO;
+ }
+ }
+ case FFA_SUCCESS:
+
+ /* Message sent with no response */
+ return FFA_ERR_STAT_SUCCESS;
+
+ case FFA_MSG_SEND_DIRECT_RESP:
+ /*
+ * Message sent with response
+ * extract the return data
+ */
+ msg->data0 = res.a3;
+ msg->data1 = res.a4;
+ msg->data2 = res.a5;
+ msg->data3 = res.a6;
+ msg->data4 = res.a7;
+
+ return FFA_ERR_STAT_SUCCESS;
+
+ default:
+ /* Undefined response function */
+ return -ENOENT;
+ }
+}
+
+/**
+ * __arm_ffa_fn_smc - SMC wrapper
+ *
+ * Calls low level SMC function
+ *
+ * Return: void
+ */
+void __ffa_runtime __arm_ffa_fn_smc(ffa_value_t args, ffa_value_t *res)
+{
+ arm_smccc_1_2_smc(&args, res);
+}
+
+/**
+ * ffa_set_conduit - Set the conduit
+ *
+ * This boot time function clears the private data structure and sets the conduit
+ *
+ * Return:
+ *
+ * FFA_ERR_STAT_SUCCESS on success. Otherwise, failure
+ */
+static int ffa_set_conduit(void)
+{
+ ffa_priv_data->invoke_ffa_fn = __arm_ffa_fn_smc;
+
+ ffa_info("Conduit is SMC");
+
+ return FFA_ERR_STAT_SUCCESS;
+}
+
+/**
+ * ffa_set_bus_ops - Set the bus driver operations
+ *
+ * Setting the driver callbacks.
+ *
+ */
+static void ffa_set_bus_ops(void)
+{
+ ffa_priv_data->ffa_ops.partition_info_get = ffa_get_partitions_info;
+ ffa_priv_data->ffa_ops.sync_send_receive = ffa_msg_send_direct_req;
+ ffa_priv_data->ffa_ops.rxtx_unmap = ffa_unmap_rxtx_buffers;
+}
+
+/**
+ * ffa_alloc_prvdata - allocate the driver main data structure
+ * @dev: the arm_ffa device
+ *
+ * This boot time function creates the main data structure embedding all the driver data.
+ *
+ * Return:
+ *
+ * FFA_ERR_STAT_SUCCESS on success. Otherwise, failure
+ */
+static int ffa_alloc_prvdata(struct udevice *dev)
+{
+ if (!dev)
+ return -ENODEV;
+
+ /* The device is registered with the DM. Let's create the driver main data structure*/
+
+ ffa_priv_data = devm_kmalloc(dev, sizeof(struct ffa_prvdata), __GFP_ZERO);
+ if (!ffa_priv_data) {
+ ffa_err("can not allocate the driver main data structure");
+ return -ENOMEM;
+ }
+
+ ffa_priv_data->dev = dev;
+
+ return FFA_ERR_STAT_SUCCESS;
+}
+
+/**
+ * ffa_probe - The driver probe function
+ * @dev: the arm_ffa device
+ *
+ * Probing is done at boot time and triggered by the uclass device discovery.
+ * At probe level the following actions are done:
+ * - setting the conduit
+ * - querying the FF-A framework version
+ * - querying from secure world the u-boot endpoint ID
+ * - querying from secure world the supported features of the specified FF-A calls
+ * - mapping the RX/TX buffers
+ * - querying from secure world all the partitions information
+ *
+ * All data queried from secure world is saved in the resident private data structure.
+ *
+ * The probe will fail if either FF-A framework is not detected or the
+ * FF-A requests are not behaving correctly. This ensures that the
+ * driver is not installed and its operations are not exported to the clients.
+ * However, once the driver is successfully probed and an FF-A anomaly is
+ * detected when clients invoke the driver operations, the driver cause
+ * u-boot to panic because the client would not know what to do in such conditions.
+ *
+ * Return:
+ *
+ * FFA_ERR_STAT_SUCCESS on success. Otherwise, failure
+ */
+static int ffa_probe(struct udevice *dev)
+{
+ int ret;
+ size_t buf_4k_pages = 0;
+
+ ret = ffa_alloc_prvdata(dev);
+ if (ret != FFA_ERR_STAT_SUCCESS)
+ return ret;
+
+ ffa_set_bus_ops();
+
+ ret = ffa_set_conduit();
+ if (ret != FFA_ERR_STAT_SUCCESS)
+ return ret;
+
+ ret = ffa_get_version();
+ if (ret != FFA_ERR_STAT_SUCCESS)
+ return ret;
+
+ ret = ffa_get_endpoint_id();
+ if (ret != FFA_ERR_STAT_SUCCESS)
+ return ret;
+
+ ret = ffa_get_rxtx_map_features();
+ if (ret != FFA_ERR_STAT_SUCCESS)
+ return ret;
+
+ ret = ffa_get_rxtx_buffers_pages_cnt(&buf_4k_pages);
+ if (ret != FFA_ERR_STAT_SUCCESS)
+ return ret;
+
+ ret = ffa_map_rxtx_buffers(buf_4k_pages);
+ if (ret != FFA_ERR_STAT_SUCCESS)
+ return ret;
+
+ ret = ffa_cache_partitions_info();
+ if (ret != FFA_ERR_STAT_SUCCESS) {
+ ffa_free_rxtx_buffers();
+ return ret;
+ }
+
+ return FFA_ERR_STAT_SUCCESS;
+}
+
+/**
+ * ffa_bus_ops_get - bus driver operations getter
+ *
+ * Return:
+ * This runtime function returns a pointer to the driver operations structure
+ */
+const struct ffa_bus_ops * __ffa_runtime ffa_bus_ops_get(void)
+{
+ return &ffa_priv_data->ffa_ops;
+}
+
+/**
+ * ffa_bus_prvdata_get - bus driver private data getter
+ *
+ * Return:
+ * This boot time function returns a pointer to the main private data structure
+ */
+struct ffa_prvdata **ffa_bus_prvdata_get(void)
+{
+ return &ffa_priv_data;
+}
+
+/**
+ * ffa_bus_discover - discover FF-A bus and probe the arm_ffa device
+ *
+ * This boot time function makes sure the FF-A bus is discoverable.
+ * Then, the arm_ffa device is probed and ready to use.
+ * This function is called automatically at initcalls
+ * level (after u-boot relocation).
+ *
+ * Arm FF-A transport is implemented through arm_ffa u-boot device managing the FF-A
+ * communication.
+ * All FF-A clients should use the arm_ffa device to use the FF-A transport.
+ *
+ * Return:
+ *
+ * FFA_ERR_STAT_SUCCESS on success. Otherwise, failure
+ */
+int ffa_bus_discover(void)
+{
+ return ffa_device_get();
+}
+
+/**
+ * Declaring the arm_ffa driver under UCLASS_FFA
+ */
+
+U_BOOT_DRIVER(arm_ffa) = {
+ .name = FFA_DRV_NAME,
+ .id = UCLASS_FFA,
+ .probe = ffa_probe,
+};
diff --git a/drivers/arm-ffa/efi_ffa_runtime_data_mgr.c b/drivers/arm-ffa/efi_ffa_runtime_data_mgr.c
new file mode 100644
index 0000000000..942601a7ba
--- /dev/null
+++ b/drivers/arm-ffa/efi_ffa_runtime_data_mgr.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2022 ARM Limited
+ * Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
+ */
+
+#include "arm_ffa_prv.h"
+
+/**
+ * ffa_copy_runtime_data - copy the private data structure to the runtime area
+ *
+ * This boot time function copies the arm_ffa driver data structures including
+ * partitions data to the EFI runtime data section.
+ *
+ * Return:
+ *
+ * FFA_ERR_STAT_SUCCESS on success. Otherwise, failure
+ */
+efi_status_t ffa_copy_runtime_data(void)
+{
+ efi_status_t efi_ret;
+ efi_uintn_t prvdata_pages;
+ efi_uintn_t descs_pages;
+ struct ffa_prvdata **prvdata = NULL; /* Pointer to the current structure */
+ struct ffa_prvdata *runtime_prvdata = NULL; /* Pointer to the structure runtime copy */
+ u64 runtime_descs = 0;
+
+ prvdata = ffa_bus_prvdata_get();
+
+ printf("INFO: EFI: FFA: prv data area at 0x%llx\n", (u64)prvdata);
+
+ /* allocate private data runtime area */
+
+ prvdata_pages = efi_size_in_pages(sizeof(struct ffa_prvdata));
+ efi_ret = efi_allocate_pages(EFI_ALLOCATE_ANY_PAGES,
+ EFI_RUNTIME_SERVICES_DATA,
+ prvdata_pages,
+ (u64 *)&runtime_prvdata);
+
+ if (efi_ret != EFI_SUCCESS) {
+ printf("ERROR: EFI: FFA: allocating runtime data (err: 0x%lx, addr 0x%llx)\n",
+ efi_ret, (u64)runtime_prvdata);
+
+ return efi_ret;
+ }
+
+ printf("INFO: EFI: FFA: runtime data area at 0x%llx\n", (u64)runtime_prvdata);
+
+ if (!runtime_prvdata)
+ return EFI_INVALID_PARAMETER;
+
+ /* allocate the partition data runtime area */
+
+ descs_pages = efi_size_in_pages((*prvdata)->partitions.count *
+ sizeof(struct ffa_partition_desc));
+ efi_ret = efi_allocate_pages(EFI_ALLOCATE_ANY_PAGES,
+ EFI_RUNTIME_SERVICES_DATA,
+ descs_pages,
+ &runtime_descs);
+
+ if (efi_ret != EFI_SUCCESS) {
+ printf("ERROR: EFI: FFA: allocating runtime SPs data (err: 0x%lx, addr 0x%llx)\n",
+ efi_ret, runtime_descs);
+
+ efi_free_pages((u64)runtime_prvdata, prvdata_pages);
+
+ return efi_ret;
+ }
+
+ printf("INFO: EFI: FFA: SPs runtime area at 0x%llx\n", (u64)runtime_descs);
+
+ if (!runtime_descs)
+ return EFI_INVALID_PARAMETER;
+
+ *runtime_prvdata = **prvdata;
+
+ runtime_prvdata->dev = NULL;
+ runtime_prvdata->ffa_ops.partition_info_get = NULL;
+ runtime_prvdata->ffa_ops.rxtx_unmap = NULL;
+ runtime_prvdata->partitions.descs = (struct ffa_partition_desc *)runtime_descs;
+ runtime_prvdata->pair.rxbuf = 0;
+ runtime_prvdata->pair.txbuf = 0;
+
+ /*
+ * Update the private data structure pointer in the driver
+ * no need to free the old structure. devm takes care of that
+ */
+ *prvdata = runtime_prvdata;
+
+ printf("INFO: EFI: FFA: runtime prv data now at 0x%llx , SPs count %d\n",
+ (u64)*prvdata, (*prvdata)->partitions.count);
+
+ return FFA_ERR_STAT_SUCCESS;
+}
diff --git a/include/arm_ffa.h b/include/arm_ffa.h
new file mode 100644
index 0000000000..ee9ce2d99d
--- /dev/null
+++ b/include/arm_ffa.h
@@ -0,0 +1,132 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * (C) Copyright 2022 ARM Limited
+ * Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
+ */
+
+#ifndef __ARM_FFA_H
+#define __ARM_FFA_H
+
+#include <linux/printk.h>
+
+/*
+ * This header is public. It can be used by clients to access
+ * data structures and definitions they need
+ */
+
+/*
+ * Macros for displaying logs
+ */
+
+#define ffa_info(fmt, ...) pr_info("[FFA] " fmt "\n", ##__VA_ARGS__)
+#define ffa_err(fmt, ...) pr_err("[FFA] " fmt "\n", ##__VA_ARGS__)
+
+/*
+ * The driver operations success error code
+ */
+#define FFA_ERR_STAT_SUCCESS (0)
+
+/*
+ * struct ffa_partition_info - Partition information descriptor
+ * @id: Partition ID
+ * @exec_ctxt: Execution context count
+ * @properties: Partition properties
+ *
+ * Data structure containing information about partitions instantiated in the system
+ * This structure is filled with the data queried by FFA_PARTITION_INFO_GET
+ */
+struct __packed ffa_partition_info {
+ u16 id;
+ u16 exec_ctxt;
+/* partition supports receipt of direct requests */
+#define FFA_PARTITION_DIRECT_RECV BIT(0)
+/* partition can send direct requests. */
+#define FFA_PARTITION_DIRECT_SEND BIT(1)
+/* partition can send and receive indirect messages. */
+#define FFA_PARTITION_INDIRECT_MSG BIT(2)
+ u32 properties;
+};
+
+/*
+ * struct ffa_send_direct_data - Data structure hosting the data
+ * used by FFA_MSG_SEND_DIRECT_{REQ,RESP}
+ * @data0-4: Data read/written from/to x3-x7 registers
+ *
+ * Data structure containing the data to be sent by FFA_MSG_SEND_DIRECT_REQ
+ * or read from FFA_MSG_SEND_DIRECT_RESP
+ */
+
+/* For use with FFA_MSG_SEND_DIRECT_{REQ,RESP} which pass data via registers */
+struct __packed ffa_send_direct_data {
+ unsigned long data0; /* w3/x3 */
+ unsigned long data1; /* w4/x4 */
+ unsigned long data2; /* w5/x5 */
+ unsigned long data3; /* w6/x6 */
+ unsigned long data4; /* w7/x7 */
+};
+
+#if CONFIG_IS_ENABLED(ARM_FFA_EFI_RUNTIME_MODE)
+
+#include <efi_loader.h>
+
+/*
+ * __ffa_runtime - controls whether functions are
+ * available after calling the EFI ExitBootServices service.
+ * Functions tagged with these keywords are resident (available at boot time and
+ * at runtime)
+ */
+
+#define __ffa_runtime_data __efi_runtime_data
+#define __ffa_runtime __efi_runtime
+
+#else
+
+/*
+ * The FF-A driver is independent from EFI
+ */
+
+#define __ffa_runtime_data
+#define __ffa_runtime
+
+#endif
+
+/**
+ * struct ffa_bus_ops - The driver operations structure
+ * @partition_info_get: callback for the FFA_PARTITION_INFO_GET
+ * @sync_send_receive: callback for the FFA_MSG_SEND_DIRECT_REQ
+ * @rxtx_unmap: callback for the FFA_RXTX_UNMAP
+ *
+ * The data structure providing all the operations supported by the driver.
+ * This structure is EFI runtime resident.
+ */
+struct ffa_bus_ops {
+ int (*partition_info_get)(const char *uuid_str,
+ u32 *parts_size, struct ffa_partition_info *buffer);
+ int (*sync_send_receive)(u16 dst_part_id, struct ffa_send_direct_data *msg);
+ int (*rxtx_unmap)(void);
+};
+
+/**
+ * The device driver and the Uclass driver public functions
+ */
+
+/**
+ * ffa_bus_ops_get - driver operations getter
+ */
+const struct ffa_bus_ops * __ffa_runtime ffa_bus_ops_get(void);
+
+/**
+ * ffa_bus_discover - discover FF-A bus and probes the arm_ffa device
+ */
+int ffa_bus_discover(void);
+
+#if CONFIG_IS_ENABLED(ARM_FFA_EFI_RUNTIME_MODE)
+
+/**
+ * ffa_copy_runtime_data - copy the private data structure and the SPs data to the runtime area
+ */
+efi_status_t ffa_copy_runtime_data(void);
+
+#endif
+
+#endif
diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
index a432e43871..6eebbe9c7d 100644
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -55,6 +55,7 @@ enum uclass_id {
UCLASS_EFI_MEDIA, /* Devices provided by UEFI firmware */
UCLASS_ETH, /* Ethernet device */
UCLASS_ETH_PHY, /* Ethernet PHY device */
+ UCLASS_FFA, /* Arm Firmware Framework for Armv8-A */
UCLASS_FIRMWARE, /* Firmware */
UCLASS_FUZZING_ENGINE, /* Fuzzing engine */
UCLASS_FS_FIRMWARE_LOADER, /* Generic loader */
diff --git a/include/uuid.h b/include/uuid.h
index 4a4883d3b5..789f8e0f15 100644
--- a/include/uuid.h
+++ b/include/uuid.h
@@ -44,4 +44,12 @@ int uuid_guid_get_bin(const char *guid_str, unsigned char *guid_bin);
const char *uuid_guid_get_str(const unsigned char *guid_bin);
void gen_rand_uuid(unsigned char *uuid_bin);
void gen_rand_uuid_str(char *uuid_str, int str_format);
+
+#ifdef CONFIG_ARM_FFA_TRANSPORT
+/**
+ * ffa_uuid_str_to_bin - Converts a big endian UUID string to a little endian buffer
+ */
+int ffa_uuid_str_to_bin(const char *uuid_str, unsigned char *uuid_bin);
+#endif
+
#endif
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index 4da64b5d29..e02bb445f5 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -23,6 +23,10 @@
#include <asm/setjmp.h>
#include <linux/libfdt_env.h>

+#if defined(CONFIG_ARM_FFA_TRANSPORT)
+#include <arm_ffa.h>
+#endif
+
DECLARE_GLOBAL_DATA_PTR;

/* Task priority level */
@@ -2113,6 +2117,10 @@ static efi_status_t EFIAPI efi_exit_boot_services(efi_handle_t image_handle,
struct efi_event *evt, *next_event;
efi_status_t ret = EFI_SUCCESS;

+#if defined(CONFIG_ARM_FFA_TRANSPORT)
+ int ffa_ret;
+#endif
+
EFI_ENTRY("%p, %zx", image_handle, map_key);

/* Check that the caller has read the current memory map */
@@ -2173,6 +2181,15 @@ static efi_status_t EFIAPI efi_exit_boot_services(efi_handle_t image_handle,
dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL);
}

+#if defined(CONFIG_ARM_FFA_TRANSPORT)
+ /* unmap FF-A RX/TX buffers */
+ ffa_ret = ffa_bus_ops_get()->rxtx_unmap();
+ if (ffa_ret)
+ 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();

diff --git a/lib/uuid.c b/lib/uuid.c
index 284f8113ff..50b3e61d59 100644
--- a/lib/uuid.c
+++ b/lib/uuid.c
@@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2011 Calxeda, Inc.
+ * Copyright 2022 ARM Limited
*/

#include <common.h>
@@ -342,6 +343,70 @@ int uuid_str_to_bin(const char *uuid_str, unsigned char *uuid_bin,
return 0;
}

+#ifdef CONFIG_ARM_FFA_TRANSPORT
+/**
+ * ffa_uuid_str_to_bin - Converts a big endian UUID string to a little endian buffer
+ * @uuid_str: UUID string in big endian format (36 bytes wide + '/0')
+ * @uuid_bin: preallocated 16 bytes UUID buffer in little endian format
+ *
+ * UUID string is 36 characters (36 bytes):
+ *
+ * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+ * be be be be be
+ *
+ * where x is a hexadecimal character. Fields are separated by '-'s.
+ * When converting to a binary UUID, these endianness rules apply:
+ * be: means the field in the string is considered a big endian hex number
+ * and should be converted to little endian binary format
+ *
+ * Return:
+ *
+ * uuid_bin filled with little endian UUID data
+ * On success 0 is returned. Otherwise, failure code.
+ */
+int ffa_uuid_str_to_bin(const char *uuid_str, unsigned char *uuid_bin)
+{
+ u16 tmp16 = 0;
+ u32 tmp32 = 0;
+ u64 tmp64 = 0;
+
+ if (!uuid_str_valid(uuid_str) || !uuid_bin)
+ return -EINVAL;
+
+ /*
+ * reverse bytes from big to little endian
+ */
+ tmp32 = simple_strtoul(uuid_str, NULL, 16);
+ memcpy(uuid_bin, &tmp32, 4);
+
+ /*
+ * reverse bytes from big to little endian
+ */
+ tmp16 = simple_strtoul(uuid_str + 9, NULL, 16);
+ memcpy(uuid_bin + 4, &tmp16, 2);
+
+ /*
+ * reverse bytes from big to little endian
+ */
+ tmp16 = simple_strtoul(uuid_str + 14, NULL, 16);
+ memcpy(uuid_bin + 6, &tmp16, 2);
+
+ /*
+ * reverse bytes from big to little endian
+ */
+ tmp16 = simple_strtoul(uuid_str + 19, NULL, 16);
+ memcpy(uuid_bin + 8, &tmp16, 2);
+
+ /*
+ * reverse bytes from big to little endian
+ */
+ tmp64 = simple_strtoull(uuid_str + 24, NULL, 16);
+ memcpy(uuid_bin + 10, (char *)&tmp64, 6);
+
+ return 0;
+}
+#endif
+
/*
* uuid_bin_to_str() - convert big endian binary data to string UUID or GUID.
*
--
2.17.1