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

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Date:   Thu, 2 Mar 2017 10:56:16 +0000
From:   Gabriele Paoloni <gabriele.paoloni@...wei.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
CC:     "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 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;
 
-- 
2.7.4