linux-kernel - RE: [PATCHv3 04/27] PCI: mobiveil: remove flag MSI_FLAG_MULTI_PCI

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Date:   Mon, 18 Feb 2019 07:03:28 +0000
From:   "Z.q. Hou" <zhiqiang.hou@....com>
To:     Subrahmanya Lingappa <l.subrahmanya@...iveil.co.in>
CC:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        Leo Li <leoyang.li@....com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will.deacon@....com" <will.deacon@....com>,
        Mingkai Hu <mingkai.hu@....com>,
        "M.h. Lian" <minghuan.lian@....com>,
        Xiaowei Bao <xiaowei.bao@....com>
Subject: RE: [PATCHv3 04/27] PCI: mobiveil: remove flag MSI_FLAG_MULTI_PCI_MSI

Hi Subbu,

Thanks a lot for your comments!

> -----Original Message-----
> From: Subrahmanya Lingappa <l.subrahmanya@...iveil.co.in>
> Sent: 2019年2月5日 14:05
> To: Z.q. Hou <zhiqiang.hou@....com>
> Cc: linux-pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> devicetree@...r.kernel.org; linux-kernel@...r.kernel.org;
> bhelgaas@...gle.com; robh+dt@...nel.org; mark.rutland@....com;
> shawnguo@...nel.org; Leo Li <leoyang.li@....com>;
> lorenzo.pieralisi@....com; catalin.marinas@....com;
> will.deacon@....com; Mingkai Hu <mingkai.hu@....com>; M.h. Lian
> <minghuan.lian@....com>; Xiaowei Bao <xiaowei.bao@....com>
> Subject: Re: [PATCHv3 04/27] PCI: mobiveil: remove flag
> MSI_FLAG_MULTI_PCI_MSI
> 
> Zhiqiang,
> why are we removing multi-MSI support ?
> what functionality this driver is not providing to support it ?

In the function mobiveil_irq_msi_domain_alloc() there is a check about the number of IRQs to allocate: WARN_ON(nr_irqs != 1);
This is a paradox against the flag "MSI_FLAG_MULTI_PCI_MSI".

> 
> Thanks.
> 
> On Tue, Jan 29, 2019 at 1:38 PM Z.q. Hou <zhiqiang.hou@....com> wrote:
> >
> > From: Hou Zhiqiang <Zhiqiang.Hou@....com>
> >
> > The current code does not support multiple MSIs, so remove the
> > corresponding flag from the msi_domain_info structure.
> >
> > Fixes: 1e913e58335f ("PCI: mobiveil: Add MSI support")
> > Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@....com>
> > Reviewed-by: Minghuan Lian <Minghuan.Lian@....com>
> > ---
> > V3:
> >  - No change
> >
> >  drivers/pci/controller/pcie-mobiveil.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/pci/controller/pcie-mobiveil.c
> > b/drivers/pci/controller/pcie-mobiveil.c
> > index 563210e731d3..a0dd337c6214 100644
> > --- a/drivers/pci/controller/pcie-mobiveil.c
> > +++ b/drivers/pci/controller/pcie-mobiveil.c
> > @@ -703,7 +703,7 @@ static struct irq_chip mobiveil_msi_irq_chip = {
> >
> >  static struct msi_domain_info mobiveil_msi_domain_info = {
> >         .flags  = (MSI_FLAG_USE_DEF_DOM_OPS |
> MSI_FLAG_USE_DEF_CHIP_OPS |
> > -                  MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX),
> > +                  MSI_FLAG_PCI_MSIX),
> >         .chip   = &mobiveil_msi_irq_chip,
> >  };
> >
> > --
> > 2.17.1
> >
Thanks,
Zhiqiang