linux-kernel - Re: [PATCH 5/5] PCI: cadence: add EndPoint Controller driver for Cadence PCIe controller

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Date:   Thu, 14 Dec 2017 18:03:00 +0100
From:   Cyrille Pitchen <cyrille.pitchen@...e-electrons.com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:     bhelgaas@...gle.com, linux-pci@...r.kernel.org,
        adouglas@...ence.com, stelford@...ence.com, dgary@...ence.com,
        kgopi@...ence.com, eandrews@...ence.com,
        thomas.petazzoni@...e-electrons.com, sureshp@...ence.com,
        nsekhar@...com, linux-kernel@...r.kernel.org, robh@...nel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 5/5] PCI: cadence: add EndPoint Controller driver for
 Cadence PCIe controller

Le 13/12/2017 à 17:50, Cyrille Pitchen a écrit :
> Hi Kishon,
> 
> Le 05/12/2017 à 10:19, Kishon Vijay Abraham I a écrit :
>> Hi,
>>
>> On Friday 01 December 2017 05:50 PM, Lorenzo Pieralisi wrote:
>>> On Thu, Nov 23, 2017 at 04:01:50PM +0100, Cyrille Pitchen wrote:
>>>> This patch adds support to the Cadence PCIe controller in endpoint mode.
>>>
>>> Please add a brief description to the log to describe the most salient
>>> features.
>>>
>>>> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@...e-electrons.com>
>>>> ---
>>>>  drivers/pci/cadence/Kconfig           |   9 +
>>>>  drivers/pci/cadence/Makefile          |   1 +
>>>>  drivers/pci/cadence/pcie-cadence-ep.c | 553 ++++++++++++++++++++++++++++++++++
>>>>  3 files changed, 563 insertions(+)
>>>>  create mode 100644 drivers/pci/cadence/pcie-cadence-ep.c
[...]
>>>> +static int cdns_pcie_ep_write_header(struct pci_epc *epc,
>>>> +				     struct pci_epf_header *hdr)
>>>> +{
>>>> +	struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
>>>> +	struct cdns_pcie *pcie = &ep->pcie;
>>>> +	u8 fn = 0;
>>>> +
>>>> +	if (fn == 0) {
>>>
>>> I think there is some code to retrieve fn missing here.
>>
>> hmm.. the endpoint core has to send the function number which right now it's
>> not doing though it has the function number info in pci_epf.
> 
> Would it be OK if I add a new patch in the next series adding a
> 'struct pcie_epf *epf' as a 2nd argument to all handlers in the
> 'struct pcie_epc_ops'? This way I could have access to epf->func_no as needed.
>

Except for pci_epc_start() and pci_epc_stop(), both only called from
pci_epc_start_store(), I don't have trouble getting the epf value to be passed
as a 2nd argument to all other handlers in 'struct pcie_epc_ops'.

Now my next question is: is it better to keep the 'struct pci_epc *epc' as
the 1st argument of all those handlers or do you prefer me to remove it as
the value can always be retrieved from epf->epc, since now we provide epf as
a new argument ?

I have no personal preference. Please let me know your choice :)
 
> Best regards,
> 
> Cyrille
>