[PATCH 2/4] firmware: arm_ffa: Check if receiving direct requests are supported before sending

From: Sudeep Holla <sudeep.holla@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: Marc Bonnici <marc.bonnici@arm.com>,
	 Olivier Deprez <Olivier.Deprez@arm.com>,
	 Lorenzo Pieralisi <lpieralisi@kernel.org>,
	 Bertrand Marquis <Bertrand.Marquis@arm.com>,
	 Jens Wiklander <jens.wiklander@linaro.org>,
	 Sudeep Holla <sudeep.holla@arm.com>
Subject: [PATCH 2/4] firmware: arm_ffa: Check if receiving direct requests are supported before sending
Date: Mon, 15 Apr 2024 17:05:23 +0100	[thread overview]
Message-ID: <20240415-ffa_msg2_support-v1-2-a28c964b1b3f@arm.com> (raw)
In-Reply-To: <20240415-ffa_msg2_support-v1-0-a28c964b1b3f@arm.com>

Add check to see if the target partition can receive the direct requests
before sending any message to the partition.

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
 drivers/firmware/arm_ffa/driver.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index d258d04c1eda..52379885a403 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -875,9 +875,15 @@ static bool ffa_partition_check_property(struct ffa_device *dev, u32 property)
 	return partition->properties & property;
 }
 
+#define ffa_partition_supports_direct_recv(dev)	\
+	ffa_partition_check_property(dev, FFA_PARTITION_DIRECT_RECV)
+
 static int ffa_sync_send_receive(struct ffa_device *dev,
 				 struct ffa_send_direct_data *data)
 {
+	if (!ffa_partition_supports_direct_recv(dev))
+		return -EOPNOTSUPP;
+
 	return ffa_msg_send_direct_req(drv_info->vm_id, dev->vm_id,
 				       dev->mode_32bit, data);
 }

-- 
2.43.2


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