linux-kernel - RE: [PATCH v6 3/3] pci:add support aer/pme interrupts with none MSI/MSI-X/INTx mode

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Date:   Sun, 9 Oct 2016 02:47:36 +0000
From:   Po Liu <po.liu@....com>
To:     Rob Herring <robh@...nel.org>
CC:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Roy Zang <roy.zang@....com>, Mingkai Hu <mingkai.hu@....com>,
        Stuart Yoder <stuart.yoder@....com>,
        Leo Li <leoyang.li@....com>, Arnd Bergmann <arnd@...db.de>,
        "M.H. Lian" <minghuan.lian@....com>,
        Murali Karicheri <m-karicheri2@...com>
Subject: RE: [PATCH v6 3/3] pci:add support aer/pme interrupts with none
 MSI/MSI-X/INTx mode

Hi Rob,

Best regards,
Liu Po

>  -----Original Message-----
>  From: Rob Herring [mailto:robh@...nel.org]
>  Sent: Sunday, October 09, 2016 4:50 AM
>  To: Po Liu
>  Cc: linux-pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
>  linux-kernel@...r.kernel.org; devicetree@...r.kernel.org; Bjorn Helgaas;
>  Shawn Guo; Marc Zyngier; Roy Zang; Mingkai Hu; Stuart Yoder; Leo Li;
>  Arnd Bergmann; M.H. Lian; Murali Karicheri
>  Subject: Re: [PATCH v6 3/3] pci:add support aer/pme interrupts with none
>  MSI/MSI-X/INTx mode
>  
>  On Fri, Sep 30, 2016 at 05:11:37PM +0800, Po Liu wrote:
>  > On some platforms, root port doesn't support MSI/MSI-X/INTx in RC mode.
>  > When chip support the aer/pme interrupts with none MSI/MSI-X/INTx
>  > mode, maybe there is interrupt line for aer pme etc. Search the
>  > interrupt number in the fdt file. Then fixup the dev->irq with it.
>  
>  Again, explain why you are breaking compatibility. Will an old dtb using
>  "intr" still work with this change? It should normally. There are some
>  exceptions, but you need to say what they are.
>  
Ok, understand.

>  >
>  > Signed-off-by: Po Liu <po.liu@....com>
>  > ---
>  > changes for v6:
>  > 	- modify bindings for "aer""pme";
>  > 	- changing to the hood method to implement the aer pme interrupt;
>  > 	- add pme interrupt in the same way;
>  >
>  >  .../devicetree/bindings/pci/layerscape-pci.txt     | 13 +++++--
>  >  arch/arm/kernel/bios32.c                           | 43
>  ++++++++++++++++++++++
>  >  arch/arm64/kernel/pci.c                            | 43
>  ++++++++++++++++++++++
>  >  drivers/pci/pcie/portdrv_core.c                    | 31
>  +++++++++++++++-
>  >  include/linux/pci.h                                |  1 +
>  >  5 files changed, 126 insertions(+), 5 deletions(-)
>  >
>  > diff --git a/Documentation/devicetree/bindings/pci/layerscape-pci.txt
>  > b/Documentation/devicetree/bindings/pci/layerscape-pci.txt
>  > index 41e9f55..51ed49e 100644
>  > --- a/Documentation/devicetree/bindings/pci/layerscape-pci.txt
>  > +++ b/Documentation/devicetree/bindings/pci/layerscape-pci.txt
>  > @@ -18,8 +18,12 @@ Required properties:
>  >  - reg: base addresses and lengths of the PCIe controller
>  >  - interrupts: A list of interrupt outputs of the controller. Must
>  contain an
>  >    entry for each entry in the interrupt-names property.
>  > -- interrupt-names: Must include the following entries:
>  > -  "intr": The interrupt that is asserted for controller interrupts
>  > +- interrupt-names: It could include the following entries:
>  
>  "Could" is not strong enough. Every valid combination of interrupts
>  should correspond to a specific compatible string. A given version of
>  h/w either has these interrupts or not.

Ok, will change to 'must'.

>  
>  > +  "aer": Asserted for aer interrupt when chip support the aer
>  interrupt with
>  > +		 none MSI/MSI-X/INTx mode,but there is interrupt line for
>  aer.
>  > +  "pme": Asserted for pme interrupt when chip support the pme
>  interrupt with
>  > +		 none MSI/MSI-X/INTx mode,but there is interrupt line for
>  pme.
>  > +  ......
>  >  - fsl,pcie-scfg: Must include two entries.
>  >    The first entry must be a link to the SCFG device node
>  >    The second entry must be '0' or '1' based on physical PCIe
>  controller index.