Re: [PATCH v2 08/10] PCI: layerscape: Add EP mode support for ls1088a and ls2088a

From: Andrew Murray
Date: Tue Aug 27 2019 - 10:48:36 EST

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In reply to: Xiaowei Bao: "RE: [PATCH v2 08/10] PCI: layerscape: Add EP mode support for ls1088a and ls2088a"
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On Sun, Aug 25, 2019 at 03:07:32AM +0000, Xiaowei Bao wrote:
>
>
> > -----Original Message-----
> > From: christophe leroy <christophe.leroy@xxxxxx>
> > Sent: 2019å8æ24æ 14:45
> > To: Xiaowei Bao <xiaowei.bao@xxxxxxx>; Andrew Murray
> > <andrew.murray@xxxxxxx>
> > Cc: mark.rutland@xxxxxxx; Roy Zang <roy.zang@xxxxxxx>;
> > lorenzo.pieralisi@xxxxxx; arnd@xxxxxxxx; devicetree@xxxxxxxxxxxxxxx;
> > gregkh@xxxxxxxxxxxxxxxxxxx; linuxppc-dev@xxxxxxxxxxxxxxxx;
> > linux-pci@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; kishon@xxxxxx; M.h.
> > Lian <minghuan.lian@xxxxxxx>; robh+dt@xxxxxxxxxx;
> > gustavo.pimentel@xxxxxxxxxxxx; jingoohan1@xxxxxxxxx;
> > bhelgaas@xxxxxxxxxx; Leo Li <leoyang.li@xxxxxxx>; shawnguo@xxxxxxxxxx;
> > Mingkai Hu <mingkai.hu@xxxxxxx>; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> > Subject: Re: [PATCH v2 08/10] PCI: layerscape: Add EP mode support for
> > ls1088a and ls2088a
> >
> >
> >
> > Le 24/08/2019 Ã 02:18, Xiaowei Bao a ÃcritÂ:
> > >
> > >
> > >> -----Original Message-----
> > >> From: Andrew Murray <andrew.murray@xxxxxxx>
> > >> Sent: 2019å8æ23æ 22:28
> > >> To: Xiaowei Bao <xiaowei.bao@xxxxxxx>
> > >> Cc: bhelgaas@xxxxxxxxxx; robh+dt@xxxxxxxxxx; mark.rutland@xxxxxxx;
> > >> shawnguo@xxxxxxxxxx; Leo Li <leoyang.li@xxxxxxx>; kishon@xxxxxx;
> > >> 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
> > >> Subject: Re: [PATCH v2 08/10] PCI: layerscape: Add EP mode support
> > >> for ls1088a and ls2088a
> > >>
> > >> On Thu, Aug 22, 2019 at 07:22:40PM +0800, Xiaowei Bao wrote:
> > >>> Add PCIe EP mode support for ls1088a and ls2088a, there are some
> > >>> difference between LS1 and LS2 platform, so refactor the code of the
> > >>> EP driver.
> > >>>
> > >>> Signed-off-by: Xiaowei Bao <xiaowei.bao@xxxxxxx>
> > >>> ---
> > >>> v2:
> > >>> - New mechanism for layerscape EP driver.
> > >>
> > >> Was there a v1 of this patch?
> > >
> > > Yes, but I don't know how to comments, ^_^
> >
> > As far as I can see, in the previous version of the series
> > (https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpatch
> > work.ozlabs.org%2Fproject%2Flinuxppc-dev%2Flist%2F%3Fseries%3D125315
> > %26state%3D*&data=02%7C01%7Cxiaowei.bao%40nxp.com%7C1befe9
> > a67c8046f9535e08d7285eaab6%7C686ea1d3bc2b4c6fa92cd99c5c301635%
> > 7C0%7C0%7C637022259387139020&sdata=p4wbycd04Z7qRUfAoZtwc
> > UP7pR%2FuA3%2FjVcWMz6YyQVQ%3D&reserved=0),
> > the 8/10 was something completely different, and I can't find any other patch
> > in the series that could have been the v1 of this patch.
>
> Thanks, I will correct it to v1 in next version patch.

I think you numbered it correctly (so please leave it as v2, referring to
the patch series revision) - I got confused trying to find a previous
version of this patch.

Perhaps in the future when new patches are introduced in a series you can
indicate that in the description patch revision history (e.g. introduced
in v2).

Thanks,

Andrew Murray

>
> >
> > Christophe
> >
> > >
> > >>
> > >>>
> > >>> drivers/pci/controller/dwc/pci-layerscape-ep.c | 76
> > >>> ++++++++++++++++++++------
> > >>> 1 file changed, 58 insertions(+), 18 deletions(-)
> > >>>
> > >>> diff --git a/drivers/pci/controller/dwc/pci-layerscape-ep.c
> > >>> b/drivers/pci/controller/dwc/pci-layerscape-ep.c
> > >>> index 7ca5fe8..2a66f07 100644
> > >>> --- a/drivers/pci/controller/dwc/pci-layerscape-ep.c
> > >>> +++ b/drivers/pci/controller/dwc/pci-layerscape-ep.c
> > >>> @@ -20,27 +20,29 @@
> > >>>
> > >>> #define PCIE_DBI2_OFFSET 0x1000 /* DBI2 base address*/
> > >>>
> > >>> -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)
> > >>> +
> > >>> +struct ls_pcie_ep_drvdata {
> > >>> + u32 func_offset;
> > >>> + const struct dw_pcie_ep_ops *ops;
> > >>> + const struct dw_pcie_ops *dw_pcie_ops;
> > >>> };
> > >>>
> > >>> -#define to_ls_pcie_ep(x) dev_get_drvdata((x)->dev)
> > >>> +struct ls_pcie_ep {
> > >>> + struct dw_pcie *pci;
> > >>> + struct pci_epc_features *ls_epc;
> > >>> + const struct ls_pcie_ep_drvdata *drvdata; };
> > >>>
> > >>> static int ls_pcie_establish_link(struct dw_pcie *pci) {
> > >>> return 0;
> > >>> }
> > >>>
> > >>> -static const struct dw_pcie_ops ls_pcie_ep_ops = {
> > >>> +static const struct dw_pcie_ops dw_ls_pcie_ep_ops = {
> > >>> .start_link = ls_pcie_establish_link, };
> > >>>
> > >>> -static const struct of_device_id ls_pcie_ep_of_match[] = {
> > >>> - { .compatible = "fsl,ls-pcie-ep",},
> > >>> - { },
> > >>> -};
> > >>> -
> > >>> static const struct pci_epc_features*
> > >>> ls_pcie_ep_get_features(struct dw_pcie_ep *ep) { @@ -82,10 +84,44
> > >>> @@ static int ls_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
> > >>> }
> > >>> }
> > >>>
> > >>> -static const struct dw_pcie_ep_ops pcie_ep_ops = {
> > >>> +static unsigned int ls_pcie_ep_func_conf_select(struct dw_pcie_ep *ep,
> > >>> + u8 func_no)
> > >>> +{
> > >>> + struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> > >>> + struct ls_pcie_ep *pcie = to_ls_pcie_ep(pci);
> > >>> + u8 header_type;
> > >>> +
> > >>> + header_type = ioread8(pci->dbi_base + PCI_HEADER_TYPE);
> > >>> +
> > >>> + if (header_type & (1 << 7))
> > >>> + return pcie->drvdata->func_offset * func_no;
> > >>> + else
> > >>> + return 0;
> > >>
> > >> It looks like there isn't a PCI define for multi function, the
> > >> nearest I could find was PCI_HEADER_TYPE_MULTIDEVICE in
> > >> hotplug/ibmphp.h. A comment above the test might be helpful to explain
> > the test.
> > >
> > > Yes, I have not find the PCI_HEADER_TYPE_MULTIDEVICE define. OK, I
> > > will add The comments in next version patch.
> > >
> > >>
> > >> As the ls_pcie_ep_drvdata structures are static, the unset
> > >> .func_offset will be initialised to 0, so you could just drop the test above.
> > >
> > > OK, thanks
> > >
> > >>
> > >> However something to the effect of the following may help spot
> > >> misconfiguration:
> > >>
> > >> WARN_ON(func_no && !pcie->drvdata->func_offset); return
> > >> pcie->drvdata->func_offset * func_no;
> > >
> > > Thanks a lot, this looks better.
> > >
> > >>
> > >> The WARN is probably quite useful as if you are attempting to use
> > >> non-zero functions and func_offset isn't set - then things may appear
> > >> to work normally but actually will break horribly.
> > >
> > > got it, thanks.
> > >
> > >>
> > >> Thanks,
> > >>
> > >> Andrew Murray
> > >>
> > >>> +}
> > >>> +
> > >>> +static const struct dw_pcie_ep_ops ls_pcie_ep_ops = {
> > >>> .ep_init = ls_pcie_ep_init,
> > >>> .raise_irq = ls_pcie_ep_raise_irq,
> > >>> .get_features = ls_pcie_ep_get_features,
> > >>> + .func_conf_select = ls_pcie_ep_func_conf_select, };
> > >>> +
> > >>> +static const struct ls_pcie_ep_drvdata ls1_ep_drvdata = {
> > >>> + .ops = &ls_pcie_ep_ops,
> > >>> + .dw_pcie_ops = &dw_ls_pcie_ep_ops, };
> > >>> +
> > >>> +static const struct ls_pcie_ep_drvdata ls2_ep_drvdata = {
> > >>> + .func_offset = 0x20000,
> > >>> + .ops = &ls_pcie_ep_ops,
> > >>> + .dw_pcie_ops = &dw_ls_pcie_ep_ops, };
> > >>> +
> > >>> +static const struct of_device_id ls_pcie_ep_of_match[] = {
> > >>> + { .compatible = "fsl,ls1046a-pcie-ep", .data = &ls1_ep_drvdata },
> > >>> + { .compatible = "fsl,ls1088a-pcie-ep", .data = &ls2_ep_drvdata },
> > >>> + { .compatible = "fsl,ls2088a-pcie-ep", .data = &ls2_ep_drvdata },
> > >>> + { },
> > >>> };
> > >>>
> > >>> static int __init ls_add_pcie_ep(struct ls_pcie_ep *pcie, @@ -98,7
> > >>> +134,7 @@ static int __init ls_add_pcie_ep(struct ls_pcie_ep *pcie,
> > >>> int ret;
> > >>>
> > >>> ep = &pci->ep;
> > >>> - ep->ops = &pcie_ep_ops;
> > >>> + ep->ops = pcie->drvdata->ops;
> > >>>
> > >>> res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> > >> "addr_space");
> > >>> if (!res)
> > >>> @@ -137,14 +173,11 @@ static int __init ls_pcie_ep_probe(struct
> > >> platform_device *pdev)
> > >>> 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))
> > >>> - return PTR_ERR(pci->dbi_base);
> > >>> + pcie->drvdata = of_device_get_match_data(dev);
> > >>>
> > >>> - pci->dbi_base2 = pci->dbi_base + PCIE_DBI2_OFFSET;
> > >>> pci->dev = dev;
> > >>> - pci->ops = &ls_pcie_ep_ops;
> > >>> + pci->ops = pcie->drvdata->dw_pcie_ops;
> > >>> +
> > >>> pcie->pci = pci;
> > >>>
> > >>> ls_epc->linkup_notifier = false,
> > >>> @@ -152,6 +185,13 @@ static int __init ls_pcie_ep_probe(struct
> > >>> platform_device *pdev)
> > >>>
> > >>> pcie->ls_epc = ls_epc;
> > >>>
> > >>> + 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))
> > >>> + return PTR_ERR(pci->dbi_base);
> > >>> +
> > >>> + pci->dbi_base2 = pci->dbi_base + PCIE_DBI2_OFFSET;
> > >>> +
> > >>> platform_set_drvdata(pdev, pcie);
> > >>>
> > >>> ret = ls_add_pcie_ep(pcie, pdev);
> > >>> --
> > >>> 2.9.5
> > >>>
> >
> > ---
> > L'absence de virus dans ce courrier Ãlectronique a ÃtÃ vÃrifiÃe par le logiciel
> > antivirus Avast.
> > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.
> > avast.com%2Fantivirus&data=02%7C01%7Cxiaowei.bao%40nxp.com%7
> > C1befe9a67c8046f9535e08d7285eaab6%7C686ea1d3bc2b4c6fa92cd99c5c3
> > 01635%7C0%7C0%7C637022259387139020&sdata=JAYds7X%2FHVxgtrg
> > e%2F%2FvnP84zdb2yReXcctQUiSLC11I%3D&reserved=0
>

Next message: Kieran Bingham: "Re: [PATCH 5/7] bcm-vk: add bcm_vk UAPI"
Previous message: Jan Kara: "Re: [PATCH 5/5] writeback, memcg: Implement foreign dirty flushing"
In reply to: Xiaowei Bao: "RE: [PATCH v2 08/10] PCI: layerscape: Add EP mode support for ls1088a and ls2088a"
Next in thread: Xiaowei Bao: "RE: [PATCH v2 08/10] PCI: layerscape: Add EP mode support for ls1088a and ls2088a"
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