Hi Frank, On Wed, Mar 2, 2022 at 3:42 PM Frank Li <frank.li@xxxxxxx> wrote: > > > > > -----Original Message----- > > From: Lad, Prabhakar <prabhakar.csengg@xxxxxxxxx> > > Sent: Thursday, February 10, 2022 3:24 AM > > To: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx> > > Cc: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>; Kishon Vijay > > Abraham I <kishon@xxxxxx>; Bjorn Helgaas <bhelgaas@xxxxxxxxxx>; Lorenzo > > Pieralisi <lorenzo.pieralisi@xxxxxxx>; Krzysztof Wilczyński <kw@xxxxxxxxx>; > > Arnd Bergmann <arnd@xxxxxxxx>; Greg Kroah-Hartman > > <gregkh@xxxxxxxxxxxxxxxxxxx>; Marek Vasut <marek.vasut+renesas@xxxxxxxxx>; > > Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>; Rob Herring > > <robh@xxxxxxxxxx>; linux-pci <linux-pci@xxxxxxxxxxxxxxx>; Linux-Renesas > > <linux-renesas-soc@xxxxxxxxxxxxxxx>; LKML <linux-kernel@xxxxxxxxxxxxxxx>; > > Biju Das <biju.das.jz@xxxxxxxxxxxxxx> > > Subject: [EXT] Re: [RFC PATCH 0/5] PCIe EPF support for internal DMAC > > handling and driver update for R-Car PCIe EP to support DMAC > > I use standard DMA engine API to implement Designware PCIE EP embedded DMA support. > Please check https://lore.kernel.org/all/20220302032646.3793-3-Frank.Li@xxxxxxx/T/ > Thank you for the link. The Designware PCIE EP is implemented as a DMA engine driver so it's convenient to use the DMA engine API, whereas the R-Car PCIe-EP is implemented as an actual PCIe EP [0]. [0] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/Documentation/devicetree/bindings/pci/rcar-pci-ep.yaml?h=next-20220302 Cheers, Prabhakar > Best regards > Frank Li > > > > > Caution: EXT Email > > > > Hi, > > > > On Thu, Feb 10, 2022 at 8:40 AM Manivannan Sadhasivam > > <manivannan.sadhasivam@xxxxxxxxxx> wrote: > > > > > > Hi, > > > > > > On Wed, Jan 26, 2022 at 07:50:38PM +0000, Lad Prabhakar wrote: > > > > Hi All, > > > > > > > > The current PCIe EPF framework supports DMA data transfers using > > external > > > > DMA only, this patch series aims to add support for platforms > > supporting > > > > internal DMAC on PCIe for data transfers. > > > > > > > > R-Car PCIe supports internal DMAC to transfer data between Internal Bus > > to > > > > PCI Express and vice versa. Last patch fills up the required flags and > > ops > > > > to support internal DMAC. > > > > > > > > Patches 1-3 are for PCIe EPF core to support internal DMAC handling, > > patch > > > > 4/5 is to fix test cases based on the conversation [1]. > > > > > > > > > > This looks similar to the Synopsys eDMA IP [1] that goes with the > > Synopsys PCIe > > > endpoint IP. Why can't you represent it as a dmaengine driver and use the > > > existing DMA support? > > > > > Let me have a look. Could you please share a link to the Synopsys PCIe > > endpoint HW manual (the driver doesn't have a binding doc). > > > > Cheers, > > Prabhakar > > > > > [1] > > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.kerne > > l.org%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Ftorvalds%2Flinux.git%2Ftree%2Fdr > > ivers%2Fdma%2Fdw- > > edma&data=04%7C01%7Cfrank.li%40nxp.com%7C95a5831aac544de2211508d9ec772f > > 9a%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637800819106821404%7CUnknow > > n%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI > > 6Mn0%3D%7C3000&sdata=yG39L2YBN9blGxTcXyVQwIXol8%2FCo%2FZ3GbGPIlqz6Mg%3D > > &reserved=0 > > > > > > > Patches are based on top of [1] next branch. > > > > > > > > [0] > > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.spini > > cs.net%2Flists%2Flinux- > > pci%2Fmsg92385.html&data=04%7C01%7Cfrank.li%40nxp.com%7C95a5831aac544de > > 2211508d9ec772f9a%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637800819106 > > 821404%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6 > > Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=ieX2gSSHFDumc1k2iWoOfMyHg236aJTE7UZ > > 5D74D9KM%3D&reserved=0 > > > > [1] > > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.kerne > > l.org%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Fhelgaas%2Fpci.git&data=04%7C > > 01%7Cfrank.li%40nxp.com%7C95a5831aac544de2211508d9ec772f9a%7C686ea1d3bc2b4c > > 6fa92cd99c5c301635%7C0%7C0%7C637800819106821404%7CUnknown%7CTWFpbGZsb3d8eyJ > > WIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000& > > sdata=Qc5cW6y5OrxprDjFQ1dNMZ4ZUc656I3FZqClaUMLx%2FM%3D&reserved=0 > > > > > > > > Cheers, > > > > Prabhakar > > > > > > > > Lad Prabhakar (5): > > > > PCI: endpoint: Add ops and flag to support internal DMAC > > > > PCI: endpoint: Add support to data transfer using internal dmac > > > > misc: pci_endpoint_test: Add driver data for Renesas RZ/G2{EHMN} > > > > misc: pci_endpoint_test: Add support to pass flags for buffer > > > > allocation > > > > PCI: rcar-ep: Add support for DMAC > > > > > > > > drivers/misc/pci_endpoint_test.c | 56 ++++- > > > > drivers/pci/controller/pcie-rcar-ep.c | 227 ++++++++++++++++++ > > > > drivers/pci/controller/pcie-rcar.h | 23 ++ > > > > drivers/pci/endpoint/functions/pci-epf-test.c | 184 ++++++++++---- > > > > drivers/pci/endpoint/pci-epf-core.c | 32 +++ > > > > include/linux/pci-epc.h | 8 + > > > > include/linux/pci-epf.h | 7 + > > > > 7 files changed, 483 insertions(+), 54 deletions(-) > > > > > > > > -- > > > > 2.25.1 > > > >
