pcie_dma_transfer_rqst Struct Reference

Host request to initiate a PCIe DMA transfer. More...

#include <msgqueue.h>

Data Fields
uint8_t	command_code
	The command code corresponding to TT_SMC_MSG_PCIE_DMA_CHIP_TO_HOST_TRANSFER or TT_SMC_MSG_PCIE_DMA_HOST_TO_CHIP_TRANSFER.
uint8_t	completion_data
	Completion data written to the MSI completion address.
uint8_t	pad [2]
	Two bytes of padding.
uint32_t	transfer_size_bytes
	Transfer size in bytes.
uint64_t	chip_addr
	Chip-side address for the transfer.
uint64_t	host_addr
	Host-side address for the transfer.
uint64_t	msi_completion_addr
	MSI completion address on the host.

Detailed Description

Host request to initiate a PCIe DMA transfer.

Messages of this type are processed by pcie_dma_transfer_handler.

For TT_SMC_MSG_PCIE_DMA_HOST_TO_CHIP_TRANSFER the DMA reads from the host and writes to the chip. For TT_SMC_MSG_PCIE_DMA_CHIP_TO_HOST_TRANSFER the DMA reads from the chip and writes to the host.

On completion an MSI is sent to the host at msi_completion_addr with the completion_data value.

Field Documentation

chip_addr

uint64_t pcie_dma_transfer_rqst::chip_addr

Chip-side address for the transfer.

command_code

uint8_t pcie_dma_transfer_rqst::command_code

The command code corresponding to TT_SMC_MSG_PCIE_DMA_CHIP_TO_HOST_TRANSFER or TT_SMC_MSG_PCIE_DMA_HOST_TO_CHIP_TRANSFER.

completion_data

uint8_t pcie_dma_transfer_rqst::completion_data

Completion data written to the MSI completion address.

host_addr

uint64_t pcie_dma_transfer_rqst::host_addr

Host-side address for the transfer.

msi_completion_addr

uint64_t pcie_dma_transfer_rqst::msi_completion_addr

MSI completion address on the host.

pad

uint8_t pcie_dma_transfer_rqst::pad[2]

Two bytes of padding.

transfer_size_bytes

uint32_t pcie_dma_transfer_rqst::transfer_size_bytes

Transfer size in bytes.

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The documentation for this struct was generated from the following file:

• tenstorrent/msgqueue.h