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From:   Karthikeyan Mitran <m.karthikeyan@mobiveil.co.in>
Date:   Wed, 19 Jun 2019 10:58:49 +0530
Message-ID: <CAKnKUHHTAsjMoMkqaWq5z6r30JUGCpxSaYwyp8AuE3H5R0vBig@mail.gmail.com>
Subject: Re: [PATCHv5 10/20] PCI: mobiveil: Fix the INTx process errors
To:     Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc:     "Z.q. Hou" <zhiqiang.hou@nxp.com>,
        "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
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        "mark.rutland@arm.com" <mark.rutland@arm.com>,
        "l.subrahmanya@mobiveil.co.in" <l.subrahmanya@mobiveil.co.in>,
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        Leo Li <leoyang.li@nxp.com>,
        "catalin.marinas@arm.com" <catalin.marinas@arm.com>,
        "will.deacon@arm.com" <will.deacon@arm.com>,
        Mingkai Hu <mingkai.hu@nxp.com>,
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        Xiaowei Bao <xiaowei.bao@nxp.com>
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On Fri, Jun 14, 2019 at 4:14 PM Lorenzo Pieralisi
<lorenzo.pieralisi@arm.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@mobiveil.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@mobiveil.co.in>
This patch fixes the INTx status extraction and handling,
I don't see any need to update this patch.
>
> Moreover:
>
> https://kernelnewbies.org/PatchCulture
>
> 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@arm.com> wrote:
> > >
> > > On Fri, Apr 12, 2019 at 08:36:12AM +0000, Z.q. Hou wrote:
> > > > From: Hou Zhiqiang <Zhiqiang.Hou@nxp.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@nxp.com>
> > > > Reviewed-by: Minghuan Lian <Minghuan.Lian@nxp.com>
> > > > Reviewed-by: Subrahmanya Lingappa <l.subrahmanya@mobiveil.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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