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.

Link: https://lore.kernel.org/r/20231005-ffa_v1-1_notif-v4-11-cddd3237809c@arm.com
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index 1c3b34eb06e4b8631e4270db512111cbbac3a219..590005234073dd3daf204a60db007985042fe77d 100644 (file)
--- 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 fb6f388a3737b894825e789c81ee9232dd3877dc..f6df81f14b6d0873318540a7f4db5737345ee56d 100644 (file)
--- 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 {