zephyr: userspace_helper: add method to add access to DMA devices

Add helper function to grant a user thread access to all system
DMA devices.

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

Author: kv2019i

zephyr/include/rtos/userspace_helper.h

@@ -133,6 +133,13 @@ static inline uint32_t user_get_partition_attr(uintptr_t ptr)
  */
 void user_grant_dai_access_all(struct k_thread *thread);
 
+/**
+ * Grant DMA device access to a user-space thread.
+ *
+ * @param thread user-space thread for which DMA access is granted
+ */
+void user_grant_dma_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

@@ -15,11 +15,13 @@
 #include <stdint.h>
 
 #include <rtos/alloc.h>
+#include <rtos/sof.h>
 #include <rtos/userspace_helper.h>
 #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>
+#include <sof/lib/dma.h>
 
 #define MODULE_DRIVER_HEAP_CACHED		CONFIG_SOF_ZEPHYR_HEAP_CACHED
 
@@ -146,6 +148,17 @@ void user_grant_dai_access_all(struct k_thread *thread)
 	LOG_DBG("Granted DAI access to thread %p for %zu devices", thread, count);
 }
 
+void user_grant_dma_access_all(struct k_thread *thread)
+{
+	const struct dma_info *info = dma_info_get();
+	struct sof_dma *d;
+
+	for (d = info->dma_array; d < info->dma_array + info->num_dmas; d++) {
+		k_thread_access_grant(thread, d->z_dev);
+		LOG_DBG("Granted DMA device access: %s to thread %p", d->z_dev->name, thread);
+	}
+}
+
 #else /* CONFIG_USERSPACE */
 
 void *user_stack_allocate(size_t stack_size, uint32_t options)