linux-kernel - Re: [PATCH v3 07/11] PCI: dwc: Record integrated eDMA register window

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Message-ID: <aYOIlDiH-X8Aq7rw@lizhi-Precision-Tower-5810>
Date: Wed, 4 Feb 2026 12:57:40 -0500
From: Frank Li <Frank.li@....com>
To: Koichiro Den <den@...inux.co.jp>
Cc: vkoul@...nel.org, mani@...nel.org, jingoohan1@...il.com,
	lpieralisi@...nel.org, kwilczynski@...nel.org, robh@...nel.org,
	bhelgaas@...gle.com, dmaengine@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 07/11] PCI: dwc: Record integrated eDMA register window

On Wed, Feb 04, 2026 at 11:54:35PM +0900, Koichiro Den wrote:
> Some DesignWare PCIe controllers integrate an eDMA block whose registers
> are located in a dedicated register window. Endpoint function drivers
> may need the physical base and size of this window to map/expose it to a
> peer.
>
> Record the physical base and size of the integrated eDMA register window
> in struct dw_pcie.
>
> Signed-off-by: Koichiro Den <den@...inux.co.jp>
> ---

Reviewed-by: Frank Li <Frank.Li@....com>

>  drivers/pci/controller/dwc/pcie-designware.c | 4 ++++
>  drivers/pci/controller/dwc/pcie-designware.h | 2 ++
>  2 files changed, 6 insertions(+)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> index 18331d9e85be..d97ad9d2aa9b 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.c
> +++ b/drivers/pci/controller/dwc/pcie-designware.c
> @@ -162,8 +162,12 @@ int dw_pcie_get_resources(struct dw_pcie *pci)
>  			pci->edma.reg_base = devm_ioremap_resource(pci->dev, res);
>  			if (IS_ERR(pci->edma.reg_base))
>  				return PTR_ERR(pci->edma.reg_base);
> +			pci->edma_reg_phys = res->start;
> +			pci->edma_reg_size = resource_size(res);
>  		} else if (pci->atu_size >= 2 * DEFAULT_DBI_DMA_OFFSET) {
>  			pci->edma.reg_base = pci->atu_base + DEFAULT_DBI_DMA_OFFSET;
> +			pci->edma_reg_phys = pci->atu_phys_addr + DEFAULT_DBI_DMA_OFFSET;
> +			pci->edma_reg_size = pci->atu_size - DEFAULT_DBI_DMA_OFFSET;
>  		}
>  	}
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index 43d7606bc987..88e4a9e514e8 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -542,6 +542,8 @@ struct dw_pcie {
>  	int			max_link_speed;
>  	u8			n_fts[2];
>  	struct dw_edma_chip	edma;
> +	phys_addr_t		edma_reg_phys;
> +	resource_size_t		edma_reg_size;
>  	bool			l1ss_support;	/* L1 PM Substates support */
>  	struct clk_bulk_data	app_clks[DW_PCIE_NUM_APP_CLKS];
>  	struct clk_bulk_data	core_clks[DW_PCIE_NUM_CORE_CLKS];
> --
> 2.51.0
>