dai: add functionality to grant access to DAI devices

Add helper functions to provide a list of all Zephyr devices
and to grant a user thread access to them.

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

Author: kv2019i

src/include/sof/lib/dai-zephyr.h

@@ -306,6 +306,13 @@ void dai_release_llp_slot(struct dai_data *dd);
  * \brief Retrieve a pointer to the Zephyr device structure for a DAI of a given type and index.
  */
 const struct device *dai_get_device(uint32_t type, uint32_t index);
+
+/**
+ * \brief Retrieve the list of all DAI devices.
+ * \param count Pointer to store the number of devices in the list.
+ * \return Pointer to the array of device pointers.
+ */
+const struct device **dai_get_device_list(size_t *count);
 /** @}*/
 
 #endif /* __SOF_LIB_DAI_ZEPHYR_H__ */

src/lib/dai.c

@@ -187,6 +187,14 @@ const struct device *zephyr_dev[] = {
 #endif
 };
 
+const struct device **dai_get_device_list(size_t *count)
+{
+	__ASSERT_NO_MSG(count);
+	*count = ARRAY_SIZE(zephyr_dev);
+
+	return zephyr_dev;
+}
+
 /* convert sof_ipc_dai_type to Zephyr dai_type */
 static int sof_dai_type_to_zephyr(uint32_t type)
 {

zephyr/include/rtos/userspace_helper.h

@@ -126,6 +126,13 @@ static inline uint32_t user_get_partition_attr(uintptr_t ptr)
 	return sys_cache_is_ptr_cached(UINT_TO_POINTER(ptr)) ? XTENSA_MMU_CACHED_WB : 0;
 }
 
+/**
+ * Grant DAI device access to a user-space thread.
+ *
+ * @param thread user-space thread for which DAI access is granted
+ */
+void user_grant_dai_access_all(struct k_thread *thread);
+
 #else
 
 static inline int user_access_to_mailbox(struct k_mem_domain *domain, k_tid_t thread_id)

zephyr/lib/userspace_helper.c

@@ -19,12 +19,16 @@
 #include <sof/audio/module_adapter/module/generic.h>
 #include <sof/audio/module_adapter/library/userspace_proxy.h>
 #include <sof/lib/mailbox.h>
+#include <sof/lib/dai.h>
 
 #define MODULE_DRIVER_HEAP_CACHED		CONFIG_SOF_ZEPHYR_HEAP_CACHED
 
 /* Zephyr includes */
 #include <zephyr/kernel.h>
 #include <zephyr/app_memory/app_memdomain.h>
+#include <zephyr/logging/log.h>
+
+LOG_MODULE_REGISTER(userspace_helper, CONFIG_SOF_LOG_LEVEL);
 
 #if CONFIG_USERSPACE
 
@@ -128,6 +132,20 @@ int user_access_to_mailbox(struct k_mem_domain *domain, k_tid_t thread_id)
 	return 0;
 }
 
+void user_grant_dai_access_all(struct k_thread *thread)
+{
+	const struct device **devices;
+	size_t count;
+	size_t i;
+
+	devices = dai_get_device_list(&count);
+
+	for (i = 0; i < count; i++)
+		k_thread_access_grant(thread, devices[i]);
+
+	LOG_DBG("Granted DAI access to thread %p for %zu devices", thread, count);
+}
+
 #else /* CONFIG_USERSPACE */
 
 void *user_stack_allocate(size_t stack_size, uint32_t options)