linux-kernel - Re: [PATCH v7 24/25] PCI: bt1: Set 64-bit DMA-mask

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Date:   Fri, 13 Jan 2023 21:23:20 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Robin Murphy <robin.murphy@....com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>
Cc:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Vinod Koul <vkoul@...nel.org>, Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Cai Huoqing <cai.huoqing@...ux.dev>,
        Jingoo Han <jingoohan1@...il.com>, Frank Li <Frank.Li@....com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        caihuoqing <caihuoqing@...du.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        linux-pci@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 24/25] PCI: bt1: Set 64-bit DMA-mask

On Fri, Jan 13, 2023 at 05:40:38PM +0000, Robin Murphy wrote:
> On 2023-01-13 12:04, Lorenzo Pieralisi wrote:
> > On Thu, Dec 15, 2022 at 02:53:04AM +0300, Serge Semin wrote:
> > > The DW PCIe RC IP-core is synthesized with the 64-bits AXI address bus.
> > > Since the device is also equipped with the eDMA engine we need to
> > > explicitly set the device DMA-mask so the DMA-engine clients would be able
> > > to allocate the data buffers from the DMA-able memory space.
> > > 
> > > Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> > > 
> > > ---
> > > 
> > > Changelog v7:
> > > - This is a new patch added on v7 stage of the series. (@Robin)
> > > ---
> > >   drivers/pci/controller/dwc/pcie-bt1.c | 4 ++++
> > >   1 file changed, 4 insertions(+)
> > 
> > Hi Robin,
> > 
> > are you OK with this change ? I think that's the last (PCI) bit we
> > need to take the series.
> 

> Yup, having gone and double-checked the context this seems fine too - I've
> slightly lost track of all the circles we've been round in by now, but it
> looks like the way things all end up after v8 (and now v9) should be
> uncontentious.

Yes, v9 has just been submitted with your Rb-tag preserved in the
coherent-DMA-mask modification patch (patch #25/27).
Please find the last version of the series here:
https://lore.kernel.org/linux-pci/20230113171409.30470-1-Sergey.Semin@baikalelectronics.ru/

-Serge(y)

> 
> Thanks,
> Robin.
> 
> > 
> > Thanks,
> > Lorenzo
> > 
> > > diff --git a/drivers/pci/controller/dwc/pcie-bt1.c b/drivers/pci/controller/dwc/pcie-bt1.c
> > > index 8b6c7d544d9a..04aa58348aa5 100644
> > > --- a/drivers/pci/controller/dwc/pcie-bt1.c
> > > +++ b/drivers/pci/controller/dwc/pcie-bt1.c
> > > @@ -583,6 +583,10 @@ static int bt1_pcie_add_port(struct bt1_pcie *btpci)
> > >   	struct device *dev = &btpci->pdev->dev;
> > >   	int ret;
> > > +	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
> > > +	if (ret)
> > > +		return ret;
> > > +
> > >   	btpci->dw.version = DW_PCIE_VER_460A;
> > >   	btpci->dw.dev = dev;
> > >   	btpci->dw.ops = &bt1_pcie_ops;
> > > -- 
> > > 2.38.1
> > > 
> > >