linux-kernel - Re: [PATCH 11/37] PCI: dwc: Split pcie-designware.c into host and core files

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Date:   Mon, 16 Jan 2017 13:38:07 +0000
From:   Joao Pinto <Joao.Pinto@...opsys.com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Arnd Bergmann <arnd@...db.de>
CC:     <linux-pci@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-omap@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-samsung-soc@...r.kernel.org>,
        <linuxppc-dev@...ts.ozlabs.org>, <linux-arm-kernel@...s.com>,
        <linux-arm-msm@...r.kernel.org>, <nsekhar@...com>
Subject: Re: [PATCH 11/37] PCI: dwc: Split pcie-designware.c into host and
 core files

Às 11:30 AM de 1/16/2017, Kishon Vijay Abraham I escreveu:
> Hi Joao,
> 
> On Monday 16 January 2017 03:57 PM, Joao Pinto wrote:
>>
>> Hi,
>>
>> Às 5:21 AM de 1/16/2017, Kishon Vijay Abraham I escreveu:
>>> Hi Joao,
>>>
>>> On Friday 13 January 2017 10:19 PM, Joao Pinto wrote:
>>>> Às 10:26 AM de 1/12/2017, Kishon Vijay Abraham I escreveu:
>>>>> Split pcie-designware.c into pcie-designware-host.c that contains
>>>>> the host specific parts of the driver and pcie-designware.c that
>>>>> contains the parts used by both host driver and endpoint driver.
>>>>>
>>>>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>>>>> ---
>>>>>  drivers/pci/dwc/Makefile               |    2 +-
>>>>>  drivers/pci/dwc/pcie-designware-host.c |  619 ++++++++++++++++++++++++++++++++
>>>>>  drivers/pci/dwc/pcie-designware.c      |  613 +------------------------------
>>>>>  drivers/pci/dwc/pcie-designware.h      |    8 +
>>>>>  4 files changed, 634 insertions(+), 608 deletions(-)
>>>>>  create mode 100644 drivers/pci/dwc/pcie-designware-host.c
>>>>>
>>>>> diff --git a/drivers/pci/dwc/Makefile b/drivers/pci/dwc/Makefile
>>>>> index 7d27c14..3b57e55 100644
>>>>> --- a/drivers/pci/dwc/Makefile
>>>>> +++ b/drivers/pci/dwc/Makefile
>>>>> @@ -1,4 +1,4 @@
>>>>
>>>> (snip...)
>>>>
>>>>> -static void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index,
>>>>> -				      int type, u64 cpu_addr, u64 pci_addr,
>>>>> -				      u32 size)
>>>>> +void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
>>>>> +			       u64 cpu_addr, u64 pci_addr, u32 size)
>>>>>  {
>>>>>  	u32 retries, val;
>>>>>  
>>>>> @@ -186,220 +151,6 @@ static void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index,
>>>>>  	dev_err(pci->dev, "iATU is not being enabled\n");
>>>>>  }
>>>>
>>>> Kishon, iATU only makes sense in The Root Complex (host), so it should be inside
>>>> the pcie-designware-host.
>>>
>>> That is not true. Outbound ATU should be programmed to access host side buffers
>>> and inbound ATU should be programmed for the host to access EP mem space.
>>
>> Sorry, I was not clear enough. What I was trying to suggest is, since the ATU
>> programming is done by the host, wouldn't be better to include it in the
>> pcie-designware-host? It is just an architectural detail.
> 
> ATU programming is required in EP mode. See "[PATCH 24/37] PCI: dwc:
> designware: Add EP mode support" in this patch series.
> 
> Anything that's required by both EP mode and RC mode, I've placed in
> pcie-designware.c

Agreed!

> 
> Thanks
> Kishon
>