linux-kernel - RE: [PATCHv5 04/20] PCI: mobiveil: Remove the flag MSI_FLAG_MULTI_PCI

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Date:   Sat, 15 Jun 2019 01:30:39 +0000
From:   "Z.q. Hou" <zhiqiang.hou@....com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
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>,
        "l.subrahmanya@...iveil.co.in" <l.subrahmanya@...iveil.co.in>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        Leo Li <leoyang.li@....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: [PATCHv5 04/20] PCI: mobiveil: Remove the flag
 MSI_FLAG_MULTI_PCI_MSI

Hi Lorenzo,

> -----Original Message-----
> From: Lorenzo Pieralisi [mailto:lorenzo.pieralisi@....com]
> Sent: 2019年6月12日 21:08
> 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;
> l.subrahmanya@...iveil.co.in; shawnguo@...nel.org; Leo Li
> <leoyang.li@....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: [PATCHv5 04/20] PCI: mobiveil: Remove the flag
> MSI_FLAG_MULTI_PCI_MSI
> 
> On Wed, Jun 12, 2019 at 11:34:51AM +0000, Z.q. Hou wrote:
> > Hi Lorenzo,
> >
> > Thanks a lot for your comments!
> >
> > > -----Original Message-----
> > > From: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> > > Sent: 2019年6月12日 1:00
> > > 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;
> > > l.subrahmanya@...iveil.co.in; shawnguo@...nel.org; Leo Li
> > > <leoyang.li@....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: [PATCHv5 04/20] PCI: mobiveil: Remove the flag
> > > MSI_FLAG_MULTI_PCI_MSI
> > >
> > > On Fri, Apr 12, 2019 at 08:35:36AM +0000, Z.q. Hou 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.
> > >
> > > Please explain me what's the problem before removing multi MSI support.
> >
> > NXP LX2 PCIe use the GIC-ITS instead of Mobiveil IP internal MSI
> > controller, so, I didn't encounter problem.
> 
> Well, you sent a patch to fix an issue, explain me the issue you are fixing then,
> aka what have you sent this patch for ?

I did not face issue, as I have explained NXP does not use the Mobiveil IP's MSI controller.
But obviously the MSI allocate function does not support multiple MSI, so I submitted this patch.

Thanks,
Zhiqiang

> 
> Lorenzo
> 
> > Subbu, did you test with Endpoint supporting multi MSI?
> >
> > Thanks,
> > Zhiqiang
> >
> > >
> > > Thanks,
> > > Lorenzo
> > >
> > > > Fixes: 1e913e58335f ("PCI: mobiveil: Add MSI support")
> > > > Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@....com>
> > > > Reviewed-by: Minghuan Lian <Minghuan.Lian@....com>
> > > > ---
> > > > V5:
> > > >  - Corrected the subject.
> > > >
> > > >  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
> > > >