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

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Date:   Fri, 14 Jun 2019 12:38:51 +0530
From:   Karthikeyan Mitran <m.karthikeyan@...iveil.co.in>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:     "Z.q. Hou" <zhiqiang.hou@....com>,
        "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 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

Acked-by: Karthikeyan Mitran <m.karthikeyan@...iveil.co.in>

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
> >



-- 
Thanks,
Regards,
Karthikeyan Mitran

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