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

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> -----Original Message-----
> From: Andrew Murray <andrew.murray@xxxxxxx>
> Sent: 2019年8月27日 21:34
> 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 Mon, Aug 26, 2019 at 09:49:35AM +0000, Xiaowei Bao wrote:
> >
> >
> > > -----Original Message-----
> > > From: Andrew Murray <andrew.murray@xxxxxxx>
> > > Sent: 2019年8月23日 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?
> > >
> > > >
> > > >  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.
> >
> > OK, I will add a comment above this code.
> >
> > >
> > > 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.
> >
> > Due to the different PCIe controller have different property, e.g.
> > PCIe controller1 support multiple function feature, but PCIe
> > controller2 don't support this feature, so I need to check which
> > controller support it and return the correct offset value, but each board only
> have one ls_pcie_ep_drvdata, ^_^.
> 
> Yes but if they don't support the feature then func_offset will be 0.
> 
> >
> > >
> > > 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;
> > >
> > > 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.
> >
> > As discussion before, I think the func_offset should not depends on
> > the function number, even if other platforms of NXP may be use write
> > registers way to access the different function config space.
> 
> I agree that func_offset is an optional parameter. But if you are attempting to
> determine the offset of a function and you are given a non-zero function
> number - then something has gone wrong if func_offset is 0.

I have understood you means, maybe I need to set a flag in the driver_data struct,
because I may add other platform of NXP, these platform use the write register 
method to access different function, e.g. 
write func_num to register, then we can access this func_num config space.

I will modify the code like this? Do you have better advice?
Case1:
diff --git a/drivers/pci/controller/dwc/pci-layerscape-ep.c b/drivers/pci/controller/dwc/pci-layerscape-ep.c
index 004a7e8..8a0d6df 100644
--- a/drivers/pci/controller/dwc/pci-layerscape-ep.c
+++ b/drivers/pci/controller/dwc/pci-layerscape-ep.c
@@ -23,6 +23,7 @@
 #define to_ls_pcie_ep(x)       dev_get_drvdata((x)->dev)

 struct ls_pcie_ep_drvdata {
+       u8                              func_config_flag;
        u32                             func_offset;
        const struct dw_pcie_ep_ops     *ops;
        const struct dw_pcie_ops        *dw_pcie_ops;
@@ -97,8 +98,14 @@ static unsigned int ls_pcie_ep_func_conf_select(struct dw_pcie_ep *ep,
         * Read the Header Type register of config space to check
         * whether this PCI device support the multiple function.
         */
-       if (header_type & (1 << 7))
-               return pcie->drvdata->func_offset * func_no;
+       if (header_type & (1 << 7)) {
+               if (pcie->drvdata->func_config_flag) {
+                       iowrite32((func_num << n), pci->dbi_base + PCI_XXXX_XXX);
+               } else {
+                       WARN_ON(func_no && !pcie->drvdata->func_offset);
+                       return pcie->drvdata->func_offset * func_no;
+               }
+       }

        return 0;
 }

Of course, I don't need to set the flag this time, because I don't use the second method(write
register method), so the code like this:
case2:
+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;

	   of course, this code is not requied, due to the 
	   pcie->drvdata->func_offset is 0, but I think this is more clear
	   if use this code.
       header_type = ioread8(pci->dbi_base + PCI_HEADER_TYPE);

       /*
        * Read the Header Type register of config space to check
        * whether this PCI device support the multiple function.
        */
       if (header_type & (1 << 7)) {
			   WARN_ON(func_no && !pcie->drvdata->func_offset);
               return pcie->drvdata->func_offset * func_no; 
		}
		
       return 0;
}

Or like this:
Case3:
+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);

	   WARN_ON(func_no && !pcie->drvdata->func_offset);
       return pcie->drvdata->func_offset * func_no;

}
Of course, we can return a -1 by adjuring the (func_no && !pcie->drvdata->func_offset) 
Valu in case1

Thanks 
Xiaowei

> 
> Thanks,
> 
> Andrew Murray
> 
> >
> > I have added the comments above the code, as follow, do you have any
> advice?
> > +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);
> > +
> > +       /*
> > +        * Read the Header Type register of config space to check
> > +        * whether this PCI device support the multiple function.
> > +        */
> > +       if (header_type & (1 << 7))
> > +               return pcie->drvdata->func_offset * func_no;
> > +
> > +       return 0;
> > +}
> >
> > Thanks a lot for your detail comments.
> >
> > >
> > > 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
> > > >




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