Re: [PATCH v7 07/10] PCI: dwc: Expose endpoint DMA resources

[sashiko-bot@kernel.org]

> Expose the DesignWare endpoint-integrated eDMA register window, logical
> DMA channels, and linked-list descriptor memories through the EPC
> auxiliary resource API. This lets endpoint functions decide which
> channels to publish to the host.
> 
> When the DMA register window is already visible through a reserved BAR
> region, report its BAR and offset. Otherwise report it as a normal
> physical resource so an endpoint function can map it. DMA channel
> resources carry hardware channel selectors, identify the corresponding
> local DMA engine device and static channel ID, and refer to linked-list
> descriptor memory by ID.
> 
> Expose DMA controller and channel resources only after the local DW eDMA
> provider has been registered, and only expose channels whose linked-list
> descriptor memory is available. The interrupt-emulation doorbell remains
> reported when the local DW eDMA provider is registered and its offset is
> valid, even if linked-list resources are unavailable. DWC non-LL exposure
> needs a metadata ABI and host parser extension, so leave it unsupported
> for now. Reject VF auxiliary resource queries because the
> RC-programmable DWC eDMA/HDMA register window is assigned to a PF BAR
> only.
> 
> 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=7