Re: [PATCH v4 1/6] PCI: endpoint: Define endpoint DMA BAR metadata format

[sashiko-bot@kernel.org]

> Define the BAR-resident metadata format used by endpoint functions that
> expose an endpoint-integrated DMA controller to the host.
> 
> A VSEC-based discovery scheme would be a natural fit, and existing
> dw-edma-pcie providers such as Synopsys EDDA and AMD (Xilinx) MDB/CPM6
> already use VSECs for DMA discovery. However, some endpoint controllers
> cannot provide enough writable configuration-space storage for a
> complete, controller-defined payload. Keep the extensible metadata in a
> BAR instead, where the endpoint function controls the layout and size.
> 
> The format describes the DMA register window, exported channel counts,
> descriptor windows, optional auxiliary windows, endpoint-local descriptor
> and auxiliary DMA addresses, and a ready bit that tells the host when the
> described BAR windows are usable. Channel entries keep the auxiliary
> window optional so layouts that need a separate data or auxiliary aperture
> can describe it without a format bump.
> 
> Signed-off-by: Koichiro Den <den@valinux.co.jp>

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

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260710082156.2395844-1-den@valinux.co.jp?part=1