linux-kernel - [PATCH v4 05/17] firmware: arm_ffa: Implement the FFA_NOTIFICATION

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Message-Id: <20231005-ffa_v1-1_notif-v4-5-cddd3237809c@arm.com>
Date:   Thu, 05 Oct 2023 15:44:58 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Sudeep Holla <sudeep.holla@....com>,
        Marc Bonnici <marc.bonnici@....com>,
        Jens Wiklander <jens.wiklander@...aro.org>,
        Coboy Chen <coboy.chen@...iatek.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Olivier Deprez <olivier.deprez@....com>
Subject: [PATCH v4 05/17] firmware: arm_ffa: Implement the
 FFA_NOTIFICATION_SET interface

The framework provides an interface to the sender to specify the
notification to signal to the receiver. A sender signals a notification
by requesting its partition manager to set the corresponding bit in the
notifications bitmap of the receiver invoking FFA_NOTIFICATION_SET.

Implement the FFA_NOTIFICATION_SET to enable the caller(sender) to send
the notifications for any other partitions in the system.

Signed-off-by: Sudeep Holla <sudeep.holla@....com>
---
 drivers/firmware/arm_ffa/driver.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index 82e54d231074..4edb3cb48014 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -616,6 +616,26 @@ static int ffa_notification_bind_common(u16 dst_id, u64 bitmap,
 	return 0;
 }
 
+static
+int ffa_notification_set(u16 src_id, u16 dst_id, u32 flags, u64 bitmap)
+{
+	ffa_value_t ret;
+	u32 src_dst_ids = PACK_TARGET_INFO(dst_id, src_id);
+
+	invoke_ffa_fn((ffa_value_t) {
+		  .a0 = FFA_NOTIFICATION_SET, .a1 = src_dst_ids, .a2 = flags,
+		  .a3 = NOTIFICATION_BITMAP_LOW(bitmap),
+		  .a4 = NOTIFICATION_BITMAP_HIGH(bitmap),
+		  }, &ret);
+
+	if (ret.a0 == FFA_ERROR)
+		return ffa_to_linux_errno((int)ret.a2);
+	else if (ret.a0 != FFA_SUCCESS)
+		return -EINVAL;
+
+	return 0;
+}
+
 static int ffa_run(struct ffa_device *dev, u16 vcpu)
 {
 	ffa_value_t ret;

-- 
2.42.0