linux-kernel - RE: [PATCHv5 10/20] PCI: mobiveil: Fix the INTx process errors

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Date:   Wed, 19 Jun 2019 07:24:19 +0000
From:   "Z.q. Hou" <zhiqiang.hou@....com>
To:     Karthikeyan Mitran <m.karthikeyan@...iveil.co.in>,
        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 10/20] PCI: mobiveil: Fix the INTx process errors

Hi Karthikeyan,

> -----Original Message-----
> From: Karthikeyan Mitran [mailto:m.karthikeyan@...iveil.co.in]
> Sent: 2019年6月19日 13:29
> To: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> Cc: Z.q. Hou <zhiqiang.hou@....com>; 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 10/20] PCI: mobiveil: Fix the INTx process errors
> 
> On Fri, Jun 14, 2019 at 4:14 PM Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> wrote:
> >
> > On Fri, Jun 14, 2019 at 12:38:51PM +0530, Karthikeyan Mitran wrote:
> > > Hi Lorenzo and Hou Zhiqiang
> > >  PAB_INTP_AMBA_MISC_STAT does have other status in the higher bits,
> > > it should have been masked before checking for the status
> >
> > You are the maintainer for this driver, so if there is something to be
> > changed you must post a patch to that extent, I do not understand what
> > the above means, write the code to fix it, I won't do it.
> >
> > I am getting a bit annoyed with this Mobiveil driver so either you
> > guys sort this out or I will have to remove it from the kernel.
> >
> > > Acked-by: Karthikeyan Mitran <m.karthikeyan@...iveil.co.in>
> >
> > Ok I assume this means you tested it but according to what you say
> > above, are there still issues with this code path ? Should we update
> > the patch ?
> Tested-by: Karthikeyan Mitran <m.karthikeyan@...iveil.co.in> This patch
> fixes the INTx status extraction and handling, I don't see any need to update
> this patch.

Thanks a lot for your test!

Zhiqiang

> >
> > Moreover:
> >
> > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fkern
> >
> elnewbies.org%2FPatchCulture&amp;data=02%7C01%7Czhiqiang.hou%40nx
> p.com
> > %7C1445570163bb479cae3708d6f47709fb%7C686ea1d3bc2b4c6fa92cd99
> c5c301635
> > %7C0%7C0%7C636965189438647036&amp;sdata=xXQ5MCPuXV08Cd%2Fi
> TBnkAmOVGOsH
> > XFi7e1xcvlYIwiA%3D&amp;reserved=0
> >
> > Please read it and never top-post.
> Thank you very much, for the information.
> 
> >
> > Thanks,
> > Lorenzo
> >
> > > On Wed, Jun 12, 2019 at 8:38 PM Lorenzo Pieralisi
> > > <lorenzo.pieralisi@....com> wrote:
> > > >
> > > > On Fri, Apr 12, 2019 at 08:36:12AM +0000, Z.q. Hou wrote:
> > > > > From: Hou Zhiqiang <Zhiqiang.Hou@....com>
> > > > >
> > > > > In the loop block, there is not code to update the loop key,
> > > > > this patch updates the loop key by re-read the INTx status
> > > > > register.
> > > > >
> > > > > This patch also add the clearing of the handled INTx status.
> > > > >
> > > > > Note: Need MV to test this fix.
> > > >
> > > > This means INTX were never tested and current code handling them
> > > > is, AFAICS, an infinite loop which is very very bad.
> > > >
> > > > This is a gross bug and must be fixed as soon as possible.
> > > >
> > > > I want Karthikeyan ACK and Tested-by on this patch.
> > > >
> > > > Lorenzo
> > > >
> > > > > Fixes: 9af6bcb11e12 ("PCI: mobiveil: Add Mobiveil PCIe Host
> > > > > Bridge IP driver")
> > > > > Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@....com>
> > > > > Reviewed-by: Minghuan Lian <Minghuan.Lian@....com>
> > > > > Reviewed-by: Subrahmanya Lingappa
> <l.subrahmanya@...iveil.co.in>
> > > > > ---
> > > > > V5:
> > > > >  - Corrected and retouched the subject and changelog.
> > > > >
> > > > >  drivers/pci/controller/pcie-mobiveil.c | 13 +++++++++----
> > > > >  1 file changed, 9 insertions(+), 4 deletions(-)
> > > > >
> > > > > diff --git a/drivers/pci/controller/pcie-mobiveil.c
> > > > > b/drivers/pci/controller/pcie-mobiveil.c
> > > > > index 4ba458474e42..78e575e71f4d 100644
> > > > > --- a/drivers/pci/controller/pcie-mobiveil.c
> > > > > +++ b/drivers/pci/controller/pcie-mobiveil.c
> > > > > @@ -361,6 +361,7 @@ static void mobiveil_pcie_isr(struct irq_desc
> *desc)
> > > > >       /* Handle INTx */
> > > > >       if (intr_status & PAB_INTP_INTX_MASK) {
> > > > >               shifted_status = csr_readl(pcie,
> > > > > PAB_INTP_AMBA_MISC_STAT);
> > > > > +             shifted_status &= PAB_INTP_INTX_MASK;
> > > > >               shifted_status >>= PAB_INTX_START;
> > > > >               do {
> > > > >                       for_each_set_bit(bit, &shifted_status,
> > > > > PCI_NUM_INTX) { @@ -372,12 +373,16 @@ static void
> mobiveil_pcie_isr(struct irq_desc *desc)
> > > > >
> dev_err_ratelimited(dev, "unexpected IRQ, INT%d\n",
> > > > >
> bit);
> > > > >
> > > > > -                             /* clear interrupt */
> > > > > -                             csr_writel(pcie,
> > > > > -                                        shifted_status <<
> PAB_INTX_START,
> > > > > +                             /* clear interrupt handled */
> > > > > +                             csr_writel(pcie, 1 <<
> > > > > + (PAB_INTX_START + bit),
> > > > >
> PAB_INTP_AMBA_MISC_STAT);
> > > > >                       }
> > > > > -             } while ((shifted_status >> PAB_INTX_START) != 0);
> > > > > +
> > > > > +                     shifted_status = csr_readl(pcie,
> > > > > +
> PAB_INTP_AMBA_MISC_STAT);
> > > > > +                     shifted_status &= PAB_INTP_INTX_MASK;
> > > > > +                     shifted_status >>= PAB_INTX_START;
> > > > > +             } while (shifted_status != 0);
> > > > >       }
> > > > >
> > > > >       /* read extra MSI status register */
> > > > > --
> > > > > 2.17.1
> > > > >
> > >
> > >
> > >
> > >
> 
> --
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