RE: [PATCH v2 06/10] PCI: layerscape: Modify the way of getting capability with different PEX

From: Xiaowei Bao
Date: Mon Sep 02 2019 - 22:11:50 EST

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In reply to: Andrew Murray: "Re: [PATCH v2 06/10] PCI: layerscape: Modify the way of getting capability with different PEX"
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> -----Original Message-----
> From: Andrew Murray <andrew.murray@xxxxxxx>
> Sent: 2019å9æ2æ 21:37
> To: Xiaowei Bao <xiaowei.bao@xxxxxxx>
> Cc: Kishon Vijay Abraham I <kishon@xxxxxx>; bhelgaas@xxxxxxxxxx;
> robh+dt@xxxxxxxxxx; mark.rutland@xxxxxxx; shawnguo@xxxxxxxxxx; Leo Li
> <leoyang.li@xxxxxxx>; lorenzo.pieralisi@xxxxxx
> <lorenzo.pieralisi@xxxxxxx>; arnd@xxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx;
> M.h. Lian <minghuan.lian@xxxxxxx>; Mingkai Hu <mingkai.hu@xxxxxxx>;
> Roy Zang <roy.zang@xxxxxxx>; jingoohan1@xxxxxxxxx;
> gustavo.pimentel@xxxxxxxxxxxx; linux-pci@xxxxxxxxxxxxxxx;
> devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linuxppc-dev@xxxxxxxxxxxxxxxx
> Subject: Re: [PATCH v2 06/10] PCI: layerscape: Modify the way of getting
> capability with different PEX
>
> On Fri, Aug 23, 2019 at 04:13:30AM +0000, Xiaowei Bao wrote:
> >
> >
> > > -----Original Message-----
> > > From: Kishon Vijay Abraham I <kishon@xxxxxx>
> > > Sent: 2019å8æ23æ 11:40
> > > To: Xiaowei Bao <xiaowei.bao@xxxxxxx>; bhelgaas@xxxxxxxxxx;
> > > robh+dt@xxxxxxxxxx; mark.rutland@xxxxxxx; shawnguo@xxxxxxxxxx; Leo
> > > robh+Li
> > > <leoyang.li@xxxxxxx>; lorenzo.pieralisi@xxxxxx
> > > <lorenzo.pieralisi@xxxxxxx>; arnd@xxxxxxxx;
> > > gregkh@xxxxxxxxxxxxxxxxxxx; M.h. Lian <minghuan.lian@xxxxxxx>;
> > > Mingkai Hu <mingkai.hu@xxxxxxx>; Roy Zang <roy.zang@xxxxxxx>;
> > > jingoohan1@xxxxxxxxx; gustavo.pimentel@xxxxxxxxxxxx;
> > > linux-pci@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx;
> > > linux-kernel@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> > > linuxppc-dev@xxxxxxxxxxxxxxxx; andrew.murray@xxxxxxx
> > > Subject: Re: [PATCH v2 06/10] PCI: layerscape: Modify the way of
> > > getting capability with different PEX
> > >
> > > Hi,
> > >
> > > (Fixed Lorenzo's email address. All the patches in the series have
> > > wrong email
> > > id)
> > >
> > > On 23/08/19 8:09 AM, Xiaowei Bao wrote:
> > > >
> > > >
> > > >> -----Original Message-----
> > > >> From: Kishon Vijay Abraham I <kishon@xxxxxx>
> > > >> Sent: 2019å8æ22æ 19:44
> > > >> To: Xiaowei Bao <xiaowei.bao@xxxxxxx>; bhelgaas@xxxxxxxxxx;
> > > >> robh+dt@xxxxxxxxxx; mark.rutland@xxxxxxx; shawnguo@xxxxxxxxxx;
> > > >> robh+Leo
> > > Li
> > > >> <leoyang.li@xxxxxxx>; lorenzo.pieralisi@xxxxxx; arnd@xxxxxxxx;
> > > >> gregkh@xxxxxxxxxxxxxxxxxxx; M.h. Lian <minghuan.lian@xxxxxxx>;
> > > >> Mingkai Hu <mingkai.hu@xxxxxxx>; Roy Zang <roy.zang@xxxxxxx>;
> > > >> jingoohan1@xxxxxxxxx; gustavo.pimentel@xxxxxxxxxxxx;
> > > >> linux-pci@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx;
> > > >> linux-kernel@xxxxxxxxxxxxxxx;
> > > >> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> > > >> linuxppc-dev@xxxxxxxxxxxxxxxx; andrew.murray@xxxxxxx
> > > >> Subject: Re: [PATCH v2 06/10] PCI: layerscape: Modify the way of
> > > >> getting capability with different PEX
> > > >>
> > > >> Hi,
> > > >>
> > > >> On 22/08/19 4:52 PM, Xiaowei Bao wrote:
> > > >>> The different PCIe controller in one board may be have different
> > > >>> capability of MSI or MSIX, so change the way of getting the MSI
> > > >>> capability, make it more flexible.
> > > >>
> > > >> please use different pci_epc_features table for different boards.
> > > > Thanks, I think that it will be more flexible to dynamically get
> > > > MSI or MSIX capability, Thus, we will not need to define the
> > > > pci_epc_feature for
> > > different boards.
> > >
> > > Is the restriction because you cannot have different compatible for
> > > different boards?
> > Sorry, I am not very clear what your mean, I think even if I use the
> > same compatible with different boards, each boards will enter the
> > probe function, in there I will get the MSI or MSIX PCIe capability of
> > the current controller in this board. Why do I need to define the
> pci_epc_feature for different boards?
>
> At present you determine how to set the [msi,msix]_capable flags of
> pci_epc_features based on reading the function capabilities at probe time.
> Instead of doing this, is it possible that you can determine the flags based on
> the compatible type alone? For example, is the MSI/MSIX capability the same
> for all fsl,ls2088a-pcie-ep devices?
>
> If it isn't *necessary* to probe for this information at probe time, then you
> could instead create a static pci_epc_features structure and assign it to
> something in your drvdata. This may provide some benefits.
>
> The dw_pcie_ep_get_features function would then look like:
>
> static const struct pci_epc_features*
> ls_pcie_ep_get_features(struct dw_pcie_ep *ep) {
> struct dw_pcie *pci = to_dw_pcie_from_pp(ep);
> struct ls_pcie_ep *pcie = dev_get_drvdata(pci->dev);
> return pcie->epc_features;
> }
>
> This also means you can revert "[v3,03/11] PCI: designware-ep: Move the".
>
> Is this what you had in mind Kishon?

Yes, I consider this scheme, but there is a issue with my board, e.g. my board have
three PCIE controllers, but only two controllers support MSI, I can't said that the
board support the MSI feature, so I only set the msi_capabitily by reading the MSI
capability struct the current PCIE controller, I am also very entangled in this issue.
so, do you have better advice? Thanks a lot.

Thanks
Xiaowei

>
> Thanks,
>
> Andrew Murray
>
> > >
> > > Thanks
> > > Kishon
> > >
> > > >>
> > > >> Thanks
> > > >> Kishon
> > > >>>
> > > >>> Signed-off-by: Xiaowei Bao <xiaowei.bao@xxxxxxx>
> > > >>> ---
> > > >>> v2:
> > > >>> - Remove the repeated assignment code.
> > > >>>
> > > >>> drivers/pci/controller/dwc/pci-layerscape-ep.c | 26
> > > >>> +++++++++++++++++++-------
> > > >>> 1 file changed, 19 insertions(+), 7 deletions(-)
> > > >>>
> > > >>> diff --git a/drivers/pci/controller/dwc/pci-layerscape-ep.c
> > > >>> b/drivers/pci/controller/dwc/pci-layerscape-ep.c
> > > >>> index 4e92a95..8461f62 100644
> > > >>> --- a/drivers/pci/controller/dwc/pci-layerscape-ep.c
> > > >>> +++ b/drivers/pci/controller/dwc/pci-layerscape-ep.c
> > > >>> @@ -22,6 +22,7 @@
> > > >>>
> > > >>> struct ls_pcie_ep {
> > > >>> struct dw_pcie *pci;
> > > >>> + struct pci_epc_features *ls_epc;
> > > >>> };
> > > >>>
> > > >>> #define to_ls_pcie_ep(x) dev_get_drvdata((x)->dev)
> > > >>> @@ -40,25 +41,26 @@ static const struct of_device_id
> > > >> ls_pcie_ep_of_match[] = {
> > > >>> { },
> > > >>> };
> > > >>>
> > > >>> -static const struct pci_epc_features ls_pcie_epc_features = {
> > > >>> - .linkup_notifier = false,
> > > >>> - .msi_capable = true,
> > > >>> - .msix_capable = false,
> > > >>> -};
> > > >>> -
> > > >>> static const struct pci_epc_features*
> > > >>> ls_pcie_ep_get_features(struct dw_pcie_ep *ep) {
> > > >>> - return &ls_pcie_epc_features;
> > > >>> + struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> > > >>> + struct ls_pcie_ep *pcie = to_ls_pcie_ep(pci);
> > > >>> +
> > > >>> + return pcie->ls_epc;
> > > >>> }
> > > >>>
> > > >>> static void ls_pcie_ep_init(struct dw_pcie_ep *ep) {
> > > >>> struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> > > >>> + struct ls_pcie_ep *pcie = to_ls_pcie_ep(pci);
> > > >>> enum pci_barno bar;
> > > >>>
> > > >>> for (bar = BAR_0; bar <= BAR_5; bar++)
> > > >>> dw_pcie_ep_reset_bar(pci, bar);
> > > >>> +
> > > >>> + pcie->ls_epc->msi_capable = ep->msi_cap ? true : false;
> > > >>> + pcie->ls_epc->msix_capable = ep->msix_cap ? true : false;
> > > >>> }
> > > >>>
> > > >>> static int ls_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8
> > > >>> func_no, @@
> > > >>> -118,6 +120,7 @@ static int __init ls_pcie_ep_probe(struct
> > > >>> platform_device
> > > >> *pdev)
> > > >>> struct device *dev = &pdev->dev;
> > > >>> struct dw_pcie *pci;
> > > >>> struct ls_pcie_ep *pcie;
> > > >>> + struct pci_epc_features *ls_epc;
> > > >>> struct resource *dbi_base;
> > > >>> int ret;
> > > >>>
> > > >>> @@ -129,6 +132,10 @@ static int __init ls_pcie_ep_probe(struct
> > > >> platform_device *pdev)
> > > >>> if (!pci)
> > > >>> return -ENOMEM;
> > > >>>
> > > >>> + ls_epc = devm_kzalloc(dev, sizeof(*ls_epc), GFP_KERNEL);
> > > >>> + if (!ls_epc)
> > > >>> + return -ENOMEM;
> > > >>> +
> > > >>> dbi_base = platform_get_resource_byname(pdev,
> > > IORESOURCE_MEM,
> > > >> "regs");
> > > >>> pci->dbi_base = devm_pci_remap_cfg_resource(dev,
> dbi_base);
> > > >>> if (IS_ERR(pci->dbi_base))
> > > >>> @@ -139,6 +146,11 @@ static int __init ls_pcie_ep_probe(struct
> > > >> platform_device *pdev)
> > > >>> pci->ops = &ls_pcie_ep_ops;
> > > >>> pcie->pci = pci;
> > > >>>
> > > >>> + ls_epc->linkup_notifier = false,
> > > >>> + ls_epc->bar_fixed_64bit = (1 << BAR_2) | (1 << BAR_4),
> > > >>> +
> > > >>> + pcie->ls_epc = ls_epc;
> > > >>> +
> > > >>> platform_set_drvdata(pdev, pcie);
> > > >>>
> > > >>> ret = ls_add_pcie_ep(pcie, pdev);
> > > >>>

Next message: Namhyung Kim: "Re: [PATCH 2/9] perf/core: Add PERF_SAMPLE_CGROUP feature"
Previous message: Qian Cai: ""Rework enabling/disabling of ATS for PCI masters" failed to compile on arm64"
In reply to: Andrew Murray: "Re: [PATCH v2 06/10] PCI: layerscape: Modify the way of getting capability with different PEX"
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