zephyr: rtos: userspace_helper.h: add sysuser memory partition

Add APP_SYSUSER_BSS() and APP_SYSUSER_DATA() macros to put global
objects to a memory partition that is available to the user context
used to run main SOF application. If SOF is run in kernel space,
these are no-ops, but if CONFIG_SOF_USERSPACE_LL is set, a dedicated
memory partition is used.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>

Author: kv2019i

zephyr/include/rtos/userspace_helper.h

@@ -26,6 +26,9 @@
 #define APP_TASK_BSS	K_APP_BMEM(common_partition)
 #define APP_TASK_DATA	K_APP_DMEM(common_partition)
 
+#define APP_SYSUSER_BSS	K_APP_BMEM(sysuser_partition)
+#define APP_SYSUSER_DATA	K_APP_DMEM(sysuser_partition)
+
 struct processing_module;
 struct userspace_context;
 
@@ -137,4 +140,27 @@ static inline int user_access_to_mailbox(struct k_mem_domain *domain, k_tid_t th
 
 #endif /* CONFIG_USERSPACE */
 
+#ifdef CONFIG_SOF_USERSPACE_LL
+
+int user_memory_attach_system_user_partition(struct k_mem_domain *dom);
+
+#else
+
+/**
+ * Attach SOF system user memory partition to a memory domain.
+ * @param dom - memory domain to attach the sysuser partition to.
+ *
+ * @return 0 for success, error otherwise.
+ *
+ * @note
+ * Function used only when CONFIG_USERSPACE is set.
+ * The sysuser partition contains shared objects required by user-space modules.
+ */
+static inline int user_memory_attach_system_user_partition(struct k_mem_domain *dom)
+{
+	return 0;
+}
+
+#endif /* CONFIG_SOF_USERSPACE_LL */
+
 #endif /* __ZEPHYR_LIB_USERSPACE_HELPER_H__ */

zephyr/lib/userspace_helper.c

@@ -36,6 +36,10 @@ LOG_MODULE_REGISTER(userspace_helper, CONFIG_SOF_LOG_LEVEL);
 
 K_APPMEM_PARTITION_DEFINE(common_partition);
 
+#ifdef CONFIG_SOF_USERSPACE_LL
+K_APPMEM_PARTITION_DEFINE(sysuser_partition);
+#endif
+
 struct k_heap *module_driver_heap_init(void)
 {
 	struct k_heap *mod_drv_heap = rballoc(SOF_MEM_FLAG_USER, sizeof(*mod_drv_heap));
@@ -83,6 +87,10 @@ int user_memory_attach_common_partition(struct k_mem_domain *dom)
 }
 
 #ifdef CONFIG_SOF_USERSPACE_LL
+int user_memory_attach_system_user_partition(struct k_mem_domain *dom)
+{
+	return k_mem_domain_add_partition(dom, &sysuser_partition);
+}
 
 int user_access_to_mailbox(struct k_mem_domain *domain, k_tid_t thread_id)
 {