From: Niklas Cassel <cassel@kernel•org>
To: Koichiro Den <den@valinux•co.jp>
Cc: jingoohan1@gmail•com, mani@kernel•org, lpieralisi@kernel•org,
kwilczynski@kernel•org, robh@kernel•org, bhelgaas@google•com,
Frank.Li@nxp•com, vigneshr@ti•com, s-vadapalli@ti•com,
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shawnguo@kernel•org, s.hauer@pengutronix•de,
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Subject: Re: [PATCH v10 4/8] PCI: dwc: ep: Support BAR subrange inbound mapping via Address Match Mode iATU
Date: Mon, 26 Jan 2026 11:25:03 +0100 [thread overview]
Message-ID: <aXdA_6shI23JBswI@ryzen> (raw)
In-Reply-To: <20260124145012.2794108-5-den@valinux.co.jp>
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@nxp•com>
> Signed-off-by: Koichiro Den <den@valinux•co.jp>
> ---
Reviewed-by: Niklas Cassel <cassel@kernel•org>
next prev parent reply other threads:[~2026-01-26 10:25 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-24 14:50 [PATCH v10 0/8] PCI: endpoint: BAR subrange mapping support Koichiro Den
2026-01-24 14:50 ` [PATCH v10 1/8] PCI: endpoint: Add dynamic_inbound_mapping EPC feature Koichiro Den
2026-01-24 14:50 ` [PATCH v10 2/8] PCI: endpoint: Add BAR subrange mapping support Koichiro Den
2026-01-24 14:50 ` [PATCH v10 3/8] PCI: dwc: Advertise dynamic inbound " Koichiro Den
2026-03-13 15:59 ` Christian Bruel
2026-03-13 18:18 ` Bjorn Helgaas
2026-03-16 12:26 ` Christian Bruel
2026-03-14 4:33 ` Koichiro Den
2026-03-16 12:41 ` Christian Bruel
2026-03-16 12:57 ` Niklas Cassel
2026-03-16 13:29 ` Christian Bruel
2026-03-16 13:50 ` Koichiro Den
2026-01-24 14:50 ` [PATCH v10 4/8] PCI: dwc: ep: Support BAR subrange inbound mapping via Address Match Mode iATU Koichiro Den
2026-01-26 10:25 ` Niklas Cassel [this message]
2026-01-24 14:50 ` [PATCH v10 5/8] Documentation: PCI: endpoint: Clarify pci_epc_set_bar() usage Koichiro Den
2026-01-24 14:50 ` [PATCH v10 6/8] PCI: endpoint: pci-epf-test: Add BAR subrange mapping test support Koichiro Den
2026-01-24 14:50 ` [PATCH v10 7/8] misc: pci_endpoint_test: Add BAR subrange mapping test case Koichiro Den
2026-01-24 14:50 ` [PATCH v10 8/8] selftests: pci_endpoint: " Koichiro Den
2026-01-28 13:47 ` [PATCH v10 0/8] PCI: endpoint: BAR subrange mapping support Manivannan Sadhasivam
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