linux-kernel - [PATCH v2 09/18] firmware: arm_ffa: Helper to check if a partition can receive REQUEST2 messages

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Message-Id: <20250131-ffa_updates-v2-9-544ba4e35387@arm.com>
Date: Fri, 31 Jan 2025 11:24:09 +0000
From: Sudeep Holla <sudeep.holla@....com>
To: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Sudeep Holla <sudeep.holla@....com>, Viresh Kumar <viresh.kumar@...aro.org>
Subject: [PATCH v2 09/18] firmware: arm_ffa: Helper to check if a partition
 can receive REQUEST2 messages

Add a helper that allows FF-A drivers to check if the partition can
receive the direct requests via the FFA_MSG_SEND_DIRECT_REQ2 ABI.

Signed-off-by: Sudeep Holla <sudeep.holla@....com>
---
 include/linux/arm_ffa.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/arm_ffa.h b/include/linux/arm_ffa.h
index ca2ad5b0ac4309052d55dcf546d29423bbd40a67..761ea8fe3bb6080c893a5eb365358b62d6a4f3ff 100644
--- a/include/linux/arm_ffa.h
+++ b/include/linux/arm_ffa.h
@@ -240,6 +240,10 @@ struct ffa_partition_info {
 #define FFA_PARTITION_NOTIFICATION_RECV	BIT(3)
 /* partition runs in the AArch64 execution state. */
 #define FFA_PARTITION_AARCH64_EXEC	BIT(8)
+/* partition supports receipt of direct request2 */
+#define FFA_PARTITION_DIRECT_REQ2_RECV	BIT(9)
+/* partition can send direct request2. */
+#define FFA_PARTITION_DIRECT_REQ2_SEND	BIT(10)
 	u32 properties;
 	uuid_t uuid;
 };
@@ -259,6 +263,10 @@ bool ffa_partition_check_property(struct ffa_device *dev, u32 property)
 #define ffa_partition_supports_direct_recv(dev)	\
 	ffa_partition_check_property(dev, FFA_PARTITION_DIRECT_RECV)
 
+#define ffa_partition_supports_direct_req2_recv(dev)	\
+	(ffa_partition_check_property(dev, FFA_PARTITION_DIRECT_REQ2_RECV) && \
+	 !dev->mode_32bit)
+
 /* For use with FFA_MSG_SEND_DIRECT_{REQ,RESP} which pass data via registers */
 struct ffa_send_direct_data {
 	unsigned long data0; /* w3/x3 */

-- 
2.34.1