[PATCH 0/9] bus: mhi: ep: Add async read/write support

Manivannan Sadhasivam
2023-11-27T12:45:54Z

Hi,

This series add async read/write support for the MHI endpoint stack by
modifying the MHI ep stack and the MHI EPF (controller) driver.

Currently, only sync read/write operations are supported by the stack,
this resulting in poor data throughput as the transfer is halted until
receiving the DMA completion. So this series adds async support such
that the MHI transfers can continue without waiting for the transfer
completion. And once the completion happens, host is notified by sending
the transfer completion event.

This series brings iperf throughput of ~4Gbps on SM8450 based dev platform,
where previously 1.6Gbps was achieved with sync operation.

- Mani

Manivannan Sadhasivam (9):
bus: mhi: ep: Pass mhi_ep_buf_info struct to read/write APIs
bus: mhi: ep: Rename read_from_host() and write_to_host() APIs
bus: mhi: ep: Introduce async read/write callbacks
PCI: epf-mhi: Simulate async read/write using iATU
PCI: epf-mhi: Add support for DMA async read/write operation
PCI: epf-mhi: Enable MHI async read/write support
bus: mhi: ep: Add support for async DMA write operation
bus: mhi: ep: Add support for async DMA read operation
bus: mhi: ep: Add checks for read/write callbacks while registering
controllers

drivers/bus/mhi/ep/internal.h | 1 +
drivers/bus/mhi/ep/main.c | 256 +++++++++------
drivers/bus/mhi/ep/ring.c | 41 +--
drivers/pci/endpoint/functions/pci-epf-mhi.c | 314 ++++++++++++++++---
include/linux/mhi_ep.h | 33 +-
5 files changed, 485 insertions(+), 160 deletions(-)

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2.25.1