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Date: Tue, 8 Sep 2020 01:09:22 +0900 From: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com> To: Rob Herring <robh+dt@...nel.org> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>, Bjorn Helgaas <bhelgaas@...gle.com>, Jingoo Han <jingoohan1@...il.com>, Gustavo Pimentel <gustavo.pimentel@...opsys.com>, Masahiro Yamada <yamada.masahiro@...ionext.com>, Marc Zyngier <maz@...nel.org>, PCI <linux-pci@...r.kernel.org>, devicetree@...r.kernel.org, "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" <linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Masami Hiramatsu <masami.hiramatsu@...aro.org>, Jassi Brar <jaswinder.singh@...aro.org> Subject: Re: [PATCH v6 5/6] PCI: uniphier: Add iATU register support Hi Rob, On 2020/09/04 7:12, Rob Herring wrote: > On Fri, Aug 21, 2020 at 1:05 AM Kunihiko Hayashi > <hayashi.kunihiko@...ionext.com> wrote: >> >> On 2020/08/18 1:48, Rob Herring wrote: >>> On Fri, Aug 7, 2020 at 4:25 AM Kunihiko Hayashi >>> <hayashi.kunihiko@...ionext.com> wrote: >>>> >>>> This gets iATU register area from reg property. In Synopsys DWC version >>>> 4.80 or later, since iATU register area is separated from core register >>>> area, this area is necessary to get from DT independently. >>>> >>>> Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com> >>>> --- >>>> drivers/pci/controller/dwc/pcie-uniphier.c | 5 +++++ >>>> 1 file changed, 5 insertions(+) >>>> >>>> diff --git a/drivers/pci/controller/dwc/pcie-uniphier.c b/drivers/pci/controller/dwc/pcie-uniphier.c >>>> index 55a7166..93ef608 100644 >>>> --- a/drivers/pci/controller/dwc/pcie-uniphier.c >>>> +++ b/drivers/pci/controller/dwc/pcie-uniphier.c >>>> @@ -471,6 +471,11 @@ static int uniphier_pcie_probe(struct platform_device *pdev) >>>> if (IS_ERR(priv->pci.dbi_base)) >>>> return PTR_ERR(priv->pci.dbi_base); >>>> >>>> + priv->pci.atu_base = >>>> + devm_platform_ioremap_resource_byname(pdev, "atu"); >>>> + if (IS_ERR(priv->pci.atu_base)) >>>> + priv->pci.atu_base = NULL; >>> >>> Keystone has the same 'atu' resource setup. Please move its code to >>> the DW core and use that. >> >> There are some platforms that pci.atu_base is set by other way. >> The 'atu' code shouldn't be conflicted with the following existing code. > > No, it's not a conflict but needless duplication. I see. >> drivers/pci/controller/dwc/pci-keystone.c: atu_base = devm_platform_ioremap_resource_byname(pdev, "atu"); >> drivers/pci/controller/dwc/pci-keystone.c: pci->atu_base = atu_base; >> drivers/pci/controller/dwc/pcie-designware.c: pci->atu_base = pci->dbi_base + DEFAULT_DBI_ATU_OFFSET; >> drivers/pci/controller/dwc/pcie-intel-gw.c: pci->atu_base = pci->dbi_base + data->pcie_atu_offset; > > This one should have had an 'atu' region in DT. > >> drivers/pci/controller/dwc/pcie-tegra194.c: pci->atu_base = devm_ioremap_resource(dev, atu_dma_res); > > Unfortunately, a different name was used. That is the mess which is > the DW PCI controller. Okay, this has already set atu_base, so ignore it for this patch. >> >> So I'm not sure where to move the code in the DW core. >> Is there any idea? > > You just need this and then remove the keystone code: > > diff --git a/drivers/pci/controller/dwc/pcie-designware.c > b/drivers/pci/controller/dwc/pcie-designware.c > index b723e0cc41fb..680084467447 100644 > --- a/drivers/pci/controller/dwc/pcie-designware.c > +++ b/drivers/pci/controller/dwc/pcie-designware.c > @@ -556,6 +556,8 @@ void dw_pcie_setup(struct dw_pcie *pci) > dw_pcie_iatu_unroll_enabled(pci))) { > pci->iatu_unroll_enabled = true; > if (!pci->atu_base) > + pci->atu_base = > devm_platform_ioremap_resource_byname(pdev, "atu"); > + if (IS_ERR(pci->atu_base)) > pci->atu_base = pci->dbi_base + DEFAULT_DBI_ATU_OFFSET; > } > dev_dbg(pci->dev, "iATU unroll: %s\n", pci->iatu_unroll_enabled ? > I've got it. I think I need to add a bit of code to this though, I'll try to apply this and remove the duplicate code. I'll separate this from other PER/AER patches and send new series. Thank you, --- Best Regards Kunihiko Hayashi
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