Add remote get_attribute for cross core connection

To support pipelines connection between cores, ipc4_create_buffer()
must be able to create buffer shared between source and sink
components created on different cores. ipc4_create_buffer() requires
source component obs size. When both source and sink components
created on same core, ipc4_create_buffer() is executed on that core,
otherwise it is executed of core 0 (IPC processing core). So for the
case when source and sink components are created on different cores
comp_get_attribute_remote() is used to receive source obs size.

Signed-off-by: Serhiy Katsyuba <serhiy.katsyuba@intel.com>

src/idc/idc.c

@@ -158,7 +158,23 @@ static int idc_ipc4_unbind(uint32_t comp_id)
 
 	return comp_unbind(ipc_dev->cd, bu);
 }
-#endif
+
+static int idc_get_attribute(uint32_t comp_id)
+{
+	struct ipc_comp_dev *ipc_dev;
+	struct idc_payload *idc_payload;
+	struct get_attribute_remote_payload *get_attr_payload;
+
+	ipc_dev = ipc_get_comp_by_id(ipc_get(), comp_id);
+	if (!ipc_dev)
+		return -ENODEV;
+
+	idc_payload = idc_payload_get(*idc_get(), cpu_get_id());
+	get_attr_payload = (struct get_attribute_remote_payload *)idc_payload;
+
+	return comp_get_attribute(ipc_dev->cd, get_attr_payload->type, get_attr_payload->value);
+}
+#endif	/* CONFIG_IPC_MAJOR_4 */
 
 /**
  * \brief Executes IDC component params message.
@@ -368,6 +384,9 @@ void idc_cmd(struct idc_msg *msg)
 	case iTS(IDC_MSG_UNBIND):
 		ret = idc_ipc4_unbind(msg->extension);
 		break;
+	case iTS(IDC_MSG_GET_ATTRIBUTE):
+		ret = idc_get_attribute(msg->extension);
+		break;
 #endif
 	case iTS(IDC_MSG_PARAMS):
 		ret = idc_params(msg->extension);

src/include/sof/audio/component_ext.h

@@ -208,15 +208,61 @@ static inline int comp_prepare(struct comp_dev *dev)
 
 int comp_copy(struct comp_dev *dev);
 
+#if CONFIG_IPC_MAJOR_4
+struct get_attribute_remote_payload {
+	uint32_t type;
+	void *value;
+};
+
+static inline int comp_ipc4_get_attribute_remote(struct comp_dev *dev, uint32_t type,
+						 void *value)
+{
+	struct ipc4_base_module_cfg *base_cfg;
+	struct get_attribute_remote_payload payload = {};
+	struct idc_msg msg = { IDC_MSG_GET_ATTRIBUTE,
+		IDC_EXTENSION(dev->ipc_config.id), dev->ipc_config.core,
+		sizeof(payload), &payload};
+	int ret;
+
+	/* Only COMP_ATTR_BASE_CONFIG is supported for remote access */
+	if (type != COMP_ATTR_BASE_CONFIG)
+		return -EINVAL;
+
+	base_cfg = rzalloc(SOF_MEM_ZONE_RUNTIME_SHARED, 0, SOF_MEM_CAPS_RAM, sizeof(*base_cfg));
+	if (!base_cfg)
+		return -ENOMEM;
+
+	payload.type = type;
+	payload.value = base_cfg;
+
+	ret = idc_send_msg(&msg, IDC_BLOCKING);
+
+	if (ret == 0)
+		memcpy_s(value, sizeof(struct ipc4_base_module_cfg),
+			 base_cfg, sizeof(struct ipc4_base_module_cfg));
+
+	rfree(base_cfg);
+	return ret;
+}
+#endif	/* CONFIG_IPC_MAJOR_4 */
 
 /** See comp_ops::get_attribute */
 static inline int comp_get_attribute(struct comp_dev *dev, uint32_t type,
 				     void *value)
 {
+#if CONFIG_IPC_MAJOR_4
+	if (dev->drv->ops.get_attribute)
+		return cpu_is_me(dev->ipc_config.core) ?
+			dev->drv->ops.get_attribute(dev, type, value) :
+			comp_ipc4_get_attribute_remote(dev, type, value);
+
+	return 0;
+#else
 	if (dev->drv->ops.get_attribute)
 		return dev->drv->ops.get_attribute(dev, type, value);
 
 	return 0;
+#endif
 }
 
 /** See comp_ops::set_attribute */

xtos/include/rtos/idc.h

@@ -103,6 +103,7 @@
 
 #define IDC_MSG_BIND IDC_TYPE(0xD)
 #define IDC_MSG_UNBIND IDC_TYPE(0xE)
+#define IDC_MSG_GET_ATTRIBUTE IDC_TYPE(0xF)
 
 #define IDC_HEADER_TO_AMS_SLOT_MASK(x)	(x & 0xFFFF)
 

zephyr/include/rtos/idc.h

@@ -104,6 +104,7 @@
 
 #define IDC_MSG_BIND IDC_TYPE(0xD)
 #define IDC_MSG_UNBIND IDC_TYPE(0xE)
+#define IDC_MSG_GET_ATTRIBUTE IDC_TYPE(0xF)
 
 /** \brief IDC_MSG_SECONDARY_CORE_CRASHED header fields. */
 #define IDC_SCC_CORE_SHIFT		0