From: Abdellatif El Khlifi <abdellatif.elkhl...@arm.com>
Add FFA_MEM_SHARE support to the FF-A emulator
Signed-off-by: Abdellatif El Khlifi <abdellatif.elkhl...@arm.com>
Cc: Tom Rini <tr...@konsulko.com>
Cc: Simon Glass <s...@chromium.org>
Cc: Ilias Apalodimas <ilias.apalodi...@linaro.org>
Cc: Jens Wiklander <jens.wiklan...@linaro.org>
Cc: Casey Connolly <casey.conno...@linaro.org>
---
.../include/asm/sandbox_arm_ffa_priv.h | 4 ++
drivers/firmware/arm-ffa/ffa-emul-uclass.c | 43 +++++++++++++++++++
drivers/firmware/arm-ffa/sandbox_ffa.c | 3 +-
3 files changed, 49 insertions(+), 1 deletion(-)
diff --git a/arch/sandbox/include/asm/sandbox_arm_ffa_priv.h
b/arch/sandbox/include/asm/sandbox_arm_ffa_priv.h
index 8f442145eba..fa09f9598ee 100644
--- a/arch/sandbox/include/asm/sandbox_arm_ffa_priv.h
+++ b/arch/sandbox/include/asm/sandbox_arm_ffa_priv.h
@@ -38,6 +38,7 @@
/* RX/TX buffers minimum size */
#define RXTX_BUFFERS_MIN_SIZE (RXTX_4K)
#define RXTX_BUFFERS_MIN_PAGES (1)
+#define RXTX_BUFFERS_MIN_PAGES_SIZE (RXTX_BUFFERS_MIN_PAGES * SZ_4K)
/* A helper macro used for clearing registers that Must Be Zero (MBZ) */
#define FFA_X_REG_SIZE_IN_BYTE sizeof((((ffa_value_t *)0)->a0))
@@ -59,6 +60,9 @@
#define SANDBOX_SERVICE2_UUID_A3 0x9cc02d72
#define SANDBOX_SERVICE2_UUID_A4 0xcdd998a7
+/* Globally unique Handle to identify the shared memory region */
+#define SANDBOX_MEM_HANDLE 0xffffffff
+
/**
* struct ffa_rxtxpair_info - structure hosting the RX/TX buffers flags
* @rxbuf_owned: RX buffer ownership flag (the owner is non secure world)
diff --git a/drivers/firmware/arm-ffa/ffa-emul-uclass.c
b/drivers/firmware/arm-ffa/ffa-emul-uclass.c
index dcf5bce9435..4918404fb6d 100644
--- a/drivers/firmware/arm-ffa/ffa-emul-uclass.c
+++ b/drivers/firmware/arm-ffa/ffa-emul-uclass.c
@@ -563,6 +563,46 @@ static int sandbox_ffa_get_parts(struct udevice *emul,
struct ffa_sandbox_data *
return 0;
}
+/**
+ * sandbox_ffa_memory_share() - Emulated FFA_MEM_SHARE handler
+ * @emul: The sandbox FF-A emulator device
+ * @pargs: The SMC call input arguments a0-a7
+ * @res: The SMC return data
+ *
+ * Emulate FFA_MEM_SHARE FF-A function.
+ *
+ * Return:
+ *
+ * 0 on success. Otherwise, failure
+ */
+static int sandbox_ffa_memory_share(struct udevice *emul, ffa_value_t *pargs,
+ ffa_value_t *res)
+{
+ int ret;
+
+ res->a1 = 0;
+
+ if (!pargs->a1 || pargs->a1 > RXTX_BUFFERS_MIN_PAGES_SIZE) {
+ /* FFA_ERROR encoding */
+ res->a0 = FFA_SMC_32(FFA_ERROR);
+ res->a2 = -INVALID_PARAMETERS;
+ ret = ffa_to_std_errmap[INVALID_PARAMETERS];
+ /* x3-x7 MBZ */
+ memset(&res->a3, 0, 5 * FFA_X_REG_SIZE_IN_BYTE);
+
+ return ret;
+ }
+
+ /* FFA_SUCCESS encoding */
+ res->a0 = FFA_SMC_32(FFA_SUCCESS);
+ res->a2 = SANDBOX_MEM_HANDLE;
+ res->a3 = SANDBOX_MEM_HANDLE;
+ /* x4-x7 MBZ */
+ memset(&res->a4, 0, 4 * FFA_X_REG_SIZE_IN_BYTE);
+
+ return 0;
+}
+
/**
* sandbox_query_ffa_emul_state() - Inspect the FF-A ABIs
* @queried_func_id: The FF-A function to be queried
@@ -653,6 +693,9 @@ void sandbox_arm_ffa_smccc_smc(ffa_value_t *args,
ffa_value_t *res)
case FFA_SMC_32(FFA_RX_RELEASE):
ret = sandbox_ffa_rx_release(emul, args, res);
break;
+ case FFA_SMC_32(FFA_MEM_SHARE):
+ ret = sandbox_ffa_memory_share(emul, args, res);
+ break;
default:
log_err("Undefined FF-A interface (%lx)\n",
args->a0);
diff --git a/drivers/firmware/arm-ffa/sandbox_ffa.c
b/drivers/firmware/arm-ffa/sandbox_ffa.c
index 44b32a829dd..8d85e660e2b 100644
--- a/drivers/firmware/arm-ffa/sandbox_ffa.c
+++ b/drivers/firmware/arm-ffa/sandbox_ffa.c
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0+
/*
- * Copyright 2022-2023 Arm Limited and/or its affiliates
<open-source-off...@arm.com>
+ * Copyright 2022-2023, 2025 Arm Limited and/or its affiliates
<open-source-off...@arm.com>
*
* Authors:
* Abdellatif El Khlifi <abdellatif.elkhl...@arm.com>
@@ -91,6 +91,7 @@ static const struct ffa_bus_ops sandbox_ffa_ops = {
.partition_info_get = ffa_get_partitions_info_hdlr,
.sync_send_receive = ffa_msg_send_direct_req_hdlr,
.rxtx_unmap = ffa_unmap_rxtx_buffers_hdlr,
+ .memory_share = ffa_memory_share_hdlr,
};
static const struct udevice_id sandbox_ffa_id[] = {
--
2.25.1
