logging: Add ipc_service log link

Added link that sends messages over ipc_service. It uses
log_link_remote and will talk to log_backend_ipc_service based
on log_link_backend.

Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>

subsys/logging/CMakeLists.txt

@@ -70,6 +70,11 @@ if(NOT CONFIG_LOG_MODE_MINIMAL)
     log_multidomain_link.c
   )
 
+  zephyr_sources_ifdef(
+    CONFIG_LOG_LINK_IPC_SERVICE
+    log_link_ipc_service.c
+  )
+
 
 else()
   zephyr_sources(log_minimal.c)

subsys/logging/Kconfig.links

@@ -4,3 +4,17 @@
 config LOG_MULTIDOMAIN_LINK
 	bool
 	select LOG_TIMESTAMP_64BIT
+
+config LOG_LINK_IPC_SERVICE
+	bool "IPC service link"
+	depends on LOG_MULTIDOMAIN
+	select LOG_MULTIDOMAIN_LINK
+
+config LOG_LINK_IPC_SERVICE_BUFFER_SIZE
+	int "Dedicated buffer size"
+	depends on LOG_LINK_IPC_SERVICE
+	default 2048
+	help
+	  Dedicated buffer allows to maintain ordering of processed messages.
+	  If 0, main buffer is used and messages are processed in the order of
+	  arrival.

subsys/logging/log_link_ipc_service.c

@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2021 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/kernel.h>
+#include <zephyr/ipc/ipc_service.h>
+#include <zephyr/logging/log_link.h>
+#include <zephyr/logging/log_multidomain_helper.h>
+#include <zephyr/logging/log_core.h>
+#include <zephyr/logging/log.h>
+
+LOG_MODULE_REGISTER(link_ipc);
+
+struct log_link_ipc_service {
+	struct ipc_ept ept;
+	struct log_multidomain_link link_remote;
+};
+
+static void bound_cb(void *priv)
+{
+	struct log_multidomain_link *link_remote = priv;
+
+	log_multidomain_link_on_started(link_remote, 0);
+}
+
+static void error_cb(const char *message, void *priv)
+{
+	struct log_multidomain_link *link_remote = priv;
+
+	log_multidomain_link_on_error(link_remote, -EIO);
+}
+
+static void recv_cb(const void *data, size_t len, void *priv)
+{
+	struct log_multidomain_link *link_remote = priv;
+
+	log_multidomain_link_on_recv_cb(link_remote, data, len);
+}
+
+static int link_ipc_service_send(struct log_multidomain_link *link_remote,
+				 void *data, size_t len)
+{
+	struct log_link_ipc_service *link_ipc_service =
+		CONTAINER_OF(link_remote, struct log_link_ipc_service, link_remote);
+
+	return ipc_service_send(&link_ipc_service->ept, data, len);
+}
+
+static int link_ipc_service_init(struct log_multidomain_link *link_remote)
+{
+	struct log_link_ipc_service *link_ipc_service =
+		CONTAINER_OF(link_remote, struct log_link_ipc_service, link_remote);
+	static struct ipc_ept_cfg ept_cfg = {
+		.name = "logging",
+		.prio = 0,
+		.cb = {
+			.bound    = bound_cb,
+			.received = recv_cb,
+			.error    = error_cb,
+		},
+	};
+	const struct device *ipc_instance = DEVICE_DT_GET(DT_CHOSEN(zephyr_log_ipc));
+	int err;
+
+	ept_cfg.priv = (void *)link_remote;
+	err = ipc_service_open_instance(ipc_instance);
+	if (err < 0 && err != -EALREADY) {
+		__ASSERT(0, "ipc_service_open_instance() failure (err:%d)\n", err);
+		return err;
+	}
+
+	err = ipc_service_register_endpoint(ipc_instance, &link_ipc_service->ept, &ept_cfg);
+
+	return err;
+}
+
+struct log_multidomain_link_transport_api log_link_ipc_service_transport_api = {
+	.init = link_ipc_service_init,
+	.send = link_ipc_service_send
+};
+
+static struct log_link_ipc_service link_ipc_service_data = {
+	.link_remote = {
+		.transport_api = &log_link_ipc_service_transport_api
+	}
+};
+
+LOG_LINK_DEF(link_ipc_service, log_multidomain_link_api,
+	     CONFIG_LOG_LINK_IPC_SERVICE_BUFFER_SIZE,
+	     &link_ipc_service_data.link_remote);
+
+const struct log_link *log_link_ipc_get_link(void)
+{
+	return &link_ipc_service;
+}