Memory Reservation Interface

Prototype	void wd_reserve_memory(struct wd_queue q, size_t size);
Function	Create DMA memory of a specified size based on q.
Input Description	q: queue size: memory size
Output Description	N/A
Return Value Description	Start address of the valid memory: success NULL: failure
Usage Instruction	This interface is used when SMMU is disabled. Memory can be reserved for each queue only once. The applied memory is released back to the kernel when the queue is released.
Precautions	This interface is used only in no-IOMMU and IOMMU-passthrough scenarios. In the SVA scenario, the function of this interface is unavailable.

Parent topic: WD Data Storage Formats and Memory Interfaces