linux-kernel - [PATCH RFT v2 11/18] firmware: arm_ffa: Add interface to send a notification to a given partition

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Date:   Tue, 19 Sep 2023 18:40:59 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Sudeep Holla <sudeep.holla@....com>,
        Jens Wiklander <jens.wiklander@...aro.org>,
        Marc Bonnici <marc.bonnici@....com>,
        Coboy Chen <coboy.chen@...iatek.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Olivier Deprez <olivier.deprez@....com>
Subject: [PATCH RFT v2 11/18] firmware: arm_ffa: Add interface to send a
 notification to a given partition

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

Expose the ability to send a notification to another partition.

Signed-off-by: Sudeep Holla <sudeep.holla@....com>
---
 drivers/firmware/arm_ffa/driver.c | 13 +++++++++++++
 include/linux/arm_ffa.h           |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index 1d61442ca4fa..b95c7979da8d 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -1033,6 +1033,18 @@ static int ffa_notify_request(struct ffa_device *dev, bool is_per_vcpu,
 	return rc;
 }
 
+static int ffa_notify_send(struct ffa_device *dev, int notify_id,
+			   bool is_per_vcpu, u16 vcpu)
+{
+	u32 flags = 0;
+
+	if (is_per_vcpu)
+		flags |= (PER_VCPU_NOTIFICATION_FLAG | vcpu << 16);
+
+	return ffa_notification_set(dev->vm_id, drv_info->vm_id, flags,
+				    BIT(notify_id));
+}
+
 static const struct ffa_info_ops ffa_drv_info_ops = {
 	.api_version_get = ffa_api_version_get,
 	.partition_info_get = ffa_partition_info_get,
@@ -1058,6 +1070,7 @@ static const struct ffa_notifier_ops ffa_drv_notifier_ops = {
 	.sched_recv_cb_unregister = ffa_sched_recv_cb_unregister,
 	.notify_request = ffa_notify_request,
 	.notify_relinquish = ffa_notify_relinquish,
+	.notify_send = ffa_notify_send,
 };
 
 static const struct ffa_ops ffa_drv_ops = {
diff --git a/include/linux/arm_ffa.h b/include/linux/arm_ffa.h
index fb6f388a3737..f6df81f14b6d 100644
--- a/include/linux/arm_ffa.h
+++ b/include/linux/arm_ffa.h
@@ -401,6 +401,8 @@ struct ffa_notifier_ops {
 	int (*notify_request)(struct ffa_device *dev, bool per_vcpu,
 			      ffa_notifier_cb cb, void *cb_data, int notify_id);
 	int (*notify_relinquish)(struct ffa_device *dev, int notify_id);
+	int (*notify_send)(struct ffa_device *dev, int notify_id, bool per_vcpu,
+			   u16 vcpu);
 };
 
 struct ffa_ops {

-- 
2.42.0