rpmsg: glink: Add announce_create ops and preallocate intents

Preallocate local intent buffers and pass the intent ids to the remote.
This way there are some default intents available  for the remote to
start sending data without having to wait by sending intent requests. Do
this by adding the rpmsg announce_create ops, which gets called right
after the rpmsg device gets probed.

Acked-by: Arun Kumar Neelakantam <aneela@codeaurora.org>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Author: Sricharan R

drivers/rpmsg/qcom_glink_native.c

@@ -23,6 +23,7 @@
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/rpmsg.h>
+#include <linux/sizes.h>
 #include <linux/slab.h>
 #include <linux/workqueue.h>
 #include <linux/mailbox_client.h>
@@ -1001,6 +1002,25 @@ static struct rpmsg_endpoint *qcom_glink_create_ept(struct rpmsg_device *rpdev,
 	return ept;
 }
 
+static int qcom_glink_announce_create(struct rpmsg_device *rpdev)
+{
+	struct glink_channel *channel = to_glink_channel(rpdev->ept);
+	struct glink_core_rx_intent *intent;
+	struct qcom_glink *glink = channel->glink;
+	int num_intents = glink->intentless ? 0 : 5;
+
+	/* Channel is now open, advertise base set of intents */
+	while (num_intents--) {
+		intent = qcom_glink_alloc_intent(glink, channel, SZ_1K, true);
+		if (!intent)
+			break;
+
+		qcom_glink_advertise_intent(glink, channel, intent);
+	}
+
+	return 0;
+}
+
 static void qcom_glink_destroy_ept(struct rpmsg_endpoint *ept)
 {
 	struct glink_channel *channel = to_glink_channel(ept);
@@ -1076,6 +1096,7 @@ static struct device_node *qcom_glink_match_channel(struct device_node *node,
 
 static const struct rpmsg_device_ops glink_device_ops = {
 	.create_ept = qcom_glink_create_ept,
+	.announce_create = qcom_glink_announce_create,
 };
 
 static const struct rpmsg_endpoint_ops glink_endpoint_ops = {