[PATCH v4 11/17] firmware: arm_ffa: Add interface to send a notification to a given partition

From: Sudeep Holla
Date: Thu Oct 05 2023 - 11:25:39 EST


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@xxxxxxx>
---
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 fc8b29648fb2..2a46052a280a 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -1038,6 +1038,18 @@ 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,
@@ -1063,6 +1075,7 @@ 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