linux-kernel - Re: [PATCH 0/9] bus: mhi: ep: Add async read/write support

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Date:   Wed, 13 Dec 2023 13:31:03 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     lpieralisi@...nel.org, kw@...ux.com, kishon@...nel.org,
        bhelgaas@...gle.com, mhi@...ts.linux.dev,
        linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/9] bus: mhi: ep: Add async read/write support

On Mon, Nov 27, 2023 at 06:15:20PM +0530, Manivannan Sadhasivam wrote:
> 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(-)

Mani, do you want to merge this via your MHI tree?  If so, you can
include Krzysztof's Reviewed-by tags and my:

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

If you think it'd be better via the PCI tree, let me know and we can
do that, too.

Bjorn