firmware: arm_ffa: Add support for passing UUID in FFA_MSG_SEND2

FF-A v1.2 introduces UUID field in partition message header used in
FFA_MSG_SEND2 to enable partitions/endpoints exposing multiple UUIDs.

Add the support for passing UUID in FFA_MSG_SEND2.

Tested-by: Viresh Kumar <viresh.kumar@linaro.org>
Message-Id: <20250217-ffa_updates-v3-10-bd1d9de615e7@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

Author: sudeep-holla

drivers/firmware/arm_ffa/driver.c

@@ -484,9 +484,9 @@ static int ffa_msg_send_direct_req(u16 src_id, u16 dst_id, bool mode_32bit,
 	return -EINVAL;
 }
 
-static int ffa_msg_send2(u16 src_id, u16 dst_id, void *buf, size_t sz)
+static int ffa_msg_send2(struct ffa_device *dev, u16 src_id, void *buf, size_t sz)
 {
-	u32 src_dst_ids = PACK_TARGET_INFO(src_id, dst_id);
+	u32 src_dst_ids = PACK_TARGET_INFO(src_id, dev->vm_id);
 	struct ffa_indirect_msg_hdr *msg;
 	ffa_value_t ret;
 	int retval = 0;
@@ -502,6 +502,7 @@ static int ffa_msg_send2(u16 src_id, u16 dst_id, void *buf, size_t sz)
 	msg->offset = sizeof(*msg);
 	msg->send_recv_id = src_dst_ids;
 	msg->size = sz;
+	uuid_copy(&msg->uuid, &dev->uuid);
 	memcpy((u8 *)msg + msg->offset, buf, sz);
 
 	/* flags = 0, sender VMID = 0 works for both physical/virtual NS */
@@ -1054,7 +1055,7 @@ static int ffa_sync_send_receive(struct ffa_device *dev,
 
 static int ffa_indirect_msg_send(struct ffa_device *dev, void *buf, size_t sz)
 {
-	return ffa_msg_send2(drv_info->vm_id, dev->vm_id, buf, sz);
+	return ffa_msg_send2(dev, drv_info->vm_id, buf, sz);
 }
 
 static int ffa_sync_send_receive2(struct ffa_device *dev,

include/linux/arm_ffa.h

@@ -282,6 +282,7 @@ struct ffa_indirect_msg_hdr {
 	u32 offset;
 	u32 send_recv_id;
 	u32 size;
+	uuid_t uuid;
 };
 
 /* For use with FFA_MSG_SEND_DIRECT_{REQ,RESP}2 which pass data via registers */