linux-kernel - Re: [PATCH v10 4/8] PCI: dwc: ep: Support BAR subrange inbound mapping via Address Match Mode iATU

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Message-ID: <aXdA_6shI23JBswI@ryzen>
Date: Mon, 26 Jan 2026 11:25:03 +0100
From: Niklas Cassel <cassel@...nel.org>
To: Koichiro Den <den@...inux.co.jp>
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Subject: Re: [PATCH v10 4/8] PCI: dwc: ep: Support BAR subrange inbound
 mapping via Address Match Mode iATU

On Sat, Jan 24, 2026 at 11:50:08PM +0900, Koichiro Den wrote:
> Extend dw_pcie_ep_set_bar() to support inbound mappings for BAR
> subranges using Address Match Mode IB iATU when pci_epf_bar.num_submap
> is non-zero.
> 
> Rename the existing BAR-match helper into dw_pcie_ep_ib_atu_bar() and
> introduce dw_pcie_ep_ib_atu_addr() for Address Match Mode. When
> num_submap is non-zero, read the assigned BAR base address and program
> one inbound iATU window per subrange. Validate the submap array before
> programming:
> - each subrange is aligned to pci->region_align
> - subranges cover the whole BAR (no gaps and no overlaps)
> 
> Track Address Match Mode mappings and tear them down on clear_bar() and
> on set_bar() error paths to avoid leaving half-programmed state or
> untranslated BAR holes.
> 
> Advertise this capability by extending the common feature bit
> initializer macro (DWC_EPC_COMMON_FEATURES).
> 
> This enables multiple inbound windows within a single BAR, which is
> useful on platforms where usable BARs are scarce but EPFs need multiple
> inbound regions.
> 
> Reviewed-by: Frank Li <Frank.Li@....com>
> Signed-off-by: Koichiro Den <den@...inux.co.jp>
> ---

Reviewed-by: Niklas Cassel <cassel@...nel.org>