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 10:27:58 +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


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.

> 
> Thanks
> Kishon
>