linux-kernel - Re: [PATCH 0/2] PCI: dwc: Expose integrated DesignWare eDMA windows

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Message-ID: <csrj7tywe54yigtwhvw2cj733vzggs3z7mkhbgtfkmc6ir7yyr@mrtmpfpmwauu>
Date: Tue, 27 Jan 2026 12:41:45 +0900
From: Koichiro Den <den@...inux.co.jp>
To: Frank Li <Frank.li@....com>
Cc: jingoohan1@...il.com, mani@...nel.org, lpieralisi@...nel.org, 
	kwilczynski@...nel.org, robh@...nel.org, bhelgaas@...gle.com, linux-pci@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] PCI: dwc: Expose integrated DesignWare eDMA windows

On Mon, Jan 26, 2026 at 12:47:51PM -0500, Frank Li wrote:
> On Mon, Jan 26, 2026 at 04:55:58PM +0900, Koichiro Den wrote:
> > On Mon, Jan 26, 2026 at 04:15:48PM +0900, Koichiro Den wrote:
> > > This series adds small, query-only helper APIs to the DesignWare PCIe
> > > endpoint controller driver to expose resources of an integrated
> > > DesignWare eDMA instance. Specifically, it allows querying:
> > >
> > >   - the physical base address and size of the integrated eDMA register
> > >     aperture, and
> > >   - the per-channel linked-list (LL) region base and size, keyed by
> > >     transfer direction and hardware channel identifier.
> > >
> > > The motivation is that some DesignWare PCIe endpoint platforms integrate
> > > an eDMA engine that can be driven either locally by the endpoint or
> > > remotely by the host. Remote eDMA use cases (e.g. [1]) need to expose
> > > the eDMA register block and LL regions to the host through PCIe BARs,
> > > while still allowing the endpoint to boot with a standard EP settings,
> > > without DT changes to hide the eDMA instance from the endpoint itself.
> > >
> > > The hardware channel identifier used by the LL-region helper can be
> > > obtained via dma_get_slave_caps().hw_id, introduced by a dmaengine
> > > series posted separately.
> >
> > For reference, the series has been submitted here:
> >
> >   [PATCH 0/5] dmaengine: dw-edma: Add helpers for remote eDMA use scenarios
> >   https://lore.kernel.org/dmaengine/20260126073652.3293564-1-den@valinux.co.jp/
> 
> It'd better post together. It needs API user.

Thanks for the comment. I've sent v2, please see:
https://lore.kernel.org/all/20260127033420.3460579-1-den@valinux.co.jp/

Koichiro

> 
> Frank
> >
> > Kind regards,
> > Koichiro
> >
> > >
> > > [1] [RFC PATCH v4 00/38] NTB transport backed by PCI EP embedded DMA
> > >     https://lore.kernel.org/linux-pci/20260118135440.1958279-1-den@valinux.co.jp/
> > >
> > > Developed on PCI controller/dwc:
> > >   commit 0ecd890e3cf5 ("PCI: dwc: Rename dw_pcie_rp::has_msi_ctrl to
> > >                         dw_pcie_rp::use_imsi_rx for clarity")
> > >
> > > Kind regards,
> > >
> > > Koichiro Den (2):
> > >   PCI: dwc: Add helper to query integrated dw-edma register window
> > >   PCI: dwc: Add helper to query integrated dw-edma linked-list region
> > >
> > >  MAINTAINERS                                  |  2 +-
> > >  drivers/pci/controller/dwc/pcie-designware.c | 74 ++++++++++++++++++++
> > >  drivers/pci/controller/dwc/pcie-designware.h |  2 +
> > >  include/linux/pcie-dwc-edma.h                | 72 +++++++++++++++++++
> > >  4 files changed, 149 insertions(+), 1 deletion(-)
> > >  create mode 100644 include/linux/pcie-dwc-edma.h
> > >
> > > --
> > > 2.51.0
> > >