linux-kernel - Re: [PATCH 14/20] PCI: hisi: update PCI config space remap function

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Date:   Thu, 2 Mar 2017 11:49:37 +0000
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Gabriele Paoloni <gabriele.paoloni@...wei.com>
Cc:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Wangzhou (B)" <wangzhou1@...ilicon.com>
Subject: Re: [PATCH 14/20] PCI: hisi: update PCI config space remap function

Hi Gabriele,

On Thu, Mar 02, 2017 at 10:56:16AM +0000, Gabriele Paoloni wrote:
> Hi Lorenzo
> 
> Many thanks for putting all of this together.
> 
> > -----Original Message-----
> > From: Lorenzo Pieralisi [mailto:lorenzo.pieralisi@....com]
> > Sent: 27 February 2017 15:14
> > To: linux-pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org
> > Cc: linux-kernel@...r.kernel.org; linux-arch@...r.kernel.org; Lorenzo
> > Pieralisi; Bjorn Helgaas; Gabriele Paoloni; Wangzhou (B)
> > Subject: [PATCH 14/20] PCI: hisi: update PCI config space remap
> > function
> > 
> > PCI configuration space should be mapped with a memory region type that
> > generates on the CPU host bus non-posted write transations. Update the
> > driver to use the devm_pci_remap_cfg* interface to make sure the
> > correct
> > memory mappings for PCI configuration space are used.
> > 
> > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> > Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> > Cc: Gabriele Paoloni <gabriele.paoloni@...wei.com>
> > Cc: Zhou Wang <wangzhou1@...ilicon.com>
> > ---
> >  drivers/pci/dwc/pcie-hisi.c | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> > 
> > diff --git a/drivers/pci/dwc/pcie-hisi.c b/drivers/pci/dwc/pcie-hisi.c
> > index e3e4fed..8042780 100644
> > --- a/drivers/pci/dwc/pcie-hisi.c
> > +++ b/drivers/pci/dwc/pcie-hisi.c
> > @@ -294,10 +294,9 @@ static int hisi_pcie_probe(struct platform_device
> > *pdev)
> >  	}
> > 
> >  	reg = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> > "rc_dbi");
> > -	pci->dbi_base = devm_ioremap_resource(dev, reg);
> > +	pci->dbi_base = devm_pci_remap_cfg_resource(dev, reg);
> >  	if (IS_ERR(pci->dbi_base))
> >  		return PTR_ERR(pci->dbi_base);
> > -
> >  	platform_set_drvdata(pdev, hisi_pcie);
> > 
> >  	ret = hisi_add_pcie_port(hisi_pcie, pdev);
> > --
> > 2.10.0
> 
> I think you missed a couple of places where cfg space is ioremapped.
> I have added these and merged with your changes in the patch below:
> 
> Thanks again
> Gab
> 
> ---------------------------------
> From: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> Date: Tue, 21 Feb 2017 15:24:34 +0000
> Subject: [PATCH 09/15] PCI: hisi: update PCI config space remap function
> 
> PCI configuration space should be mapped with a memory region type that
> generates on the CPU host bus non-posted write transations. Update the
> driver to use the devm_pci_remap_cfg* interface to make sure the correct
> memory mappings for PCI configuration space are used.
> 
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> Signed-off-by: Gabriele Paoloni <gabriele.paoloni@...wei.com>
> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> Cc: Gabriele Paoloni <gabriele.paoloni@...wei.com>
> Cc: Zhou Wang <wangzhou1@...ilicon.com>
> ---
>  drivers/pci/dwc/pcie-hisi.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pci/dwc/pcie-hisi.c b/drivers/pci/dwc/pcie-hisi.c
> index e3e4fed..a5b542c 100644
> --- a/drivers/pci/dwc/pcie-hisi.c
> +++ b/drivers/pci/dwc/pcie-hisi.c
> @@ -99,7 +99,7 @@ static int hisi_pcie_init(struct pci_config_window *cfg)
>  		return -ENOMEM;
>  	}
>  
> -	reg_base = devm_ioremap(dev, res->start, resource_size(res));
> +	reg_base = devm_pci_remap_cfgspace(dev, res->start, resource_size(res));
>  	if (!reg_base)
>  		return -ENOMEM;
>  
> @@ -294,10 +294,9 @@ static int hisi_pcie_probe(struct platform_device *pdev)
>  	}
>  
>  	reg = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rc_dbi");
> -	pci->dbi_base = devm_ioremap_resource(dev, reg);
> +	pci->dbi_base = devm_pci_remap_cfg_resource(dev, reg);
>  	if (IS_ERR(pci->dbi_base))
>  		return PTR_ERR(pci->dbi_base);
> -
>  	platform_set_drvdata(pdev, hisi_pcie);
>  
>  	ret = hisi_add_pcie_port(hisi_pcie, pdev);
> @@ -358,7 +357,7 @@ static int hisi_pcie_platform_init(struct pci_config_window *cfg)
>  		return -EINVAL;
>  	}
>  
> -	reg_base = devm_ioremap(dev, res->start, resource_size(res));
> +	reg_base = devm_pci_remap_cfgspace(dev, res->start, resource_size(res));
>  	if (!reg_base)
>  		return -ENOMEM;

I will fold the changes into v2 (and I hope other host controllers
maintainers will follow suit - I do not have enough knowledge of
all host bridges drivers internals to understand what ioremap calls
need patching).

Thanks !
Lorenzo