Re: [PATCH v7 08/10] dmaengine: dw-edma-pcie: Discover endpoint DMA metadata

[sashiko-bot@kernel.org]

> Teach dw-edma-pcie to discover a PCI endpoint DMA function from
> BAR-resident metadata. The metadata supplies the DMA register window,
> channel counts, descriptor windows, optional auxiliary windows, and
> endpoint-local descriptor and auxiliary addresses. Accept DesignWare
> eDMA unroll, HDMA compatible, and HDMA native linked-list layouts.
> 
> Endpoint-provided DMA channels use raw slave addresses because the host
> programs transfers against endpoint physical addresses, not PCI BAR
> addresses. The host-side dw-edma-pcie instance is remote-routed by
> default, so delegated channels report completions through IMWr/MSI.
> 
> Endpoint DMA metadata currently has no static PCI ID. Let an explicit
> driver_override bind use the generic endpoint DMA metadata parser, but
> do not treat arbitrary dynamic IDs without driver data as endpoint DMA
> devices.
> 
> The endpoint polls HOST_REQ at a low idle rate before programming DMA
> window submaps and setting READY. Let the host wait for several endpoint
> poll periods before treating the READY handshake as timed out.
> 
> Signed-off-by: Koichiro Den <den@valinux.co.jp>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20260813063757.3131865-1-den@valinux.co.jp?part=8