Performing First-Party DMA Transfers

The driver should perform the following steps for first-party DMA.

1. Allocate a DMA channel.

2. Use ddi_dmae_1stparty(9F) to configure the channel.

3. Ensure that the DMA object is locked in memory. See the physio(9F) or ddi_umem_lock(9F) man page.

4. Allocate DMA resources for the object.

5. Program the DMA engine on the device.

6. Start the engine.

7. When the transfer is complete, continue the bus-master operation.

8. Perform any required object synchronizations.

9. Release the DMA resources.

10. Deallocate the DMA channel.