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

[Kishon Vijay Abraham I]

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; 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?

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);
>>>