linux-kernel - RE: [EXT] Re: [PATCH] drivers: crypto: caam: jr: Allow quiesce when quiesced

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Date:   Mon, 27 Feb 2023 07:32:41 +0000
From:   Pankaj Gupta <pankaj.gupta@....com>
To:     Vijay Balakrishna <vijayb@...ux.microsoft.com>,
        Meenakshi Aggarwal <meenakshi.aggarwal@....com>,
        Horia Geanta <horia.geanta@....com>,
        Varun Sethi <V.Sethi@....com>,
        Gaurav Jain <gaurav.jain@....com>,
        "herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Franck Lenormand <franck.lenormand@....com>
CC:     "code@...icks.com" <code@...icks.com>
Subject: RE: [EXT] Re: [PATCH] drivers: crypto: caam: jr: Allow quiesce when
 quiesced

Change the year in the License header.

After changing, you can add the reviewed by me.
Reviewed-By: Pankaj Gupta <pankaj.gupta@....com>

> -----Original Message-----
> From: Vijay Balakrishna <vijayb@...ux.microsoft.com>
> Sent: Tuesday, February 21, 2023 11:03 PM
> To: Meenakshi Aggarwal <meenakshi.aggarwal@....com>; Horia Geanta
> <horia.geanta@....com>; Varun Sethi <V.Sethi@....com>; Pankaj Gupta
> <pankaj.gupta@....com>; Gaurav Jain <gaurav.jain@....com>;
> herbert@...dor.apana.org.au; davem@...emloft.net; linux-
> crypto@...r.kernel.org; linux-kernel@...r.kernel.org; Franck Lenormand
> <franck.lenormand@....com>
> Cc: code@...icks.com
> Subject: [EXT] Re: [PATCH] drivers: crypto: caam: jr: Allow quiesce when
> quiesced
> 
> Caution: EXT Email
> 
> On 2/20/2023 9:42 PM, meenakshi.aggarwal@....com wrote:
> > From: Horia Geanta <horia.geanta@....com>
> >
> > Issues:
> > - Job ring device is busy when do kexec reboot
> > - Failed to flush job ring when do system suspend-resume
> >
> > Fix:
> > Flush the job ring to stop the running jobs.
> >
> > Signed-off-by: Horia Geanta <horia.geanta@....com>
> > Signed-off-by: Franck LENORMAND <franck.lenormand@....com>
> 
> Tested-by: Vijay Balakrishna <vijayb@...ux.microsoft.com>
> 
> Thanks,
> Vijay
> 
> 
> > ---
> >   drivers/crypto/caam/jr.c | 53 +++++++++++++++++++++++++++++++++-
> ------
> >   1 file changed, 44 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/crypto/caam/jr.c b/drivers/crypto/caam/jr.c index
> > 724fdec18bf9..8745fe3cb575 100644
> > --- a/drivers/crypto/caam/jr.c
> > +++ b/drivers/crypto/caam/jr.c
> > @@ -72,19 +72,27 @@ static void caam_jr_crypto_engine_exit(void *data)
> >       crypto_engine_exit(jrpriv->engine);
> >   }
> >
> > -static int caam_reset_hw_jr(struct device *dev)
> > +/*
> > + * Put the CAAM in quiesce, ie stop
> > + *
> > + * Must be called with itr disabled
> > + */
> > +static int caam_jr_stop_processing(struct device *dev, u32 jrcr_bits)
> >   {
> >       struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
> >       unsigned int timeout = 100000;
> >
> > -     /*
> > -      * mask interrupts since we are going to poll
> > -      * for reset completion status
> > -      */
> > -     clrsetbits_32(&jrp->rregs->rconfig_lo, 0, JRCFG_IMSK);
> > +     /* Check the current status */
> > +     if (rd_reg32(&jrp->rregs->jrintstatus) & JRINT_ERR_HALT_INPROGRESS)
> > +             goto wait_quiesce_completion;
> >
> > -     /* initiate flush (required prior to reset) */
> > -     wr_reg32(&jrp->rregs->jrcommand, JRCR_RESET);
> > +     /* Reset the field */
> > +     clrsetbits_32(&jrp->rregs->jrintstatus, JRINT_ERR_HALT_MASK, 0);
> > +
> > +     /* initiate flush / park (required prior to reset) */
> > +     wr_reg32(&jrp->rregs->jrcommand, jrcr_bits);
> > +
> > +wait_quiesce_completion:
> >       while (((rd_reg32(&jrp->rregs->jrintstatus) & JRINT_ERR_HALT_MASK)
> ==
> >               JRINT_ERR_HALT_INPROGRESS) && --timeout)
> >               cpu_relax();
> > @@ -95,8 +103,35 @@ static int caam_reset_hw_jr(struct device *dev)
> >               return -EIO;
> >       }
> >
> > +     return 0;
> > +}
> > +
> > +/*
> > + * Flush the job ring, so the jobs running will be stopped, jobs
> > +queued will be
> > + * invalidated and the CAAM will no longer fetch fron input ring.
> > + *
> > + * Must be called with itr disabled
> > + */
> > +static int caam_jr_flush(struct device *dev) {
> > +     return caam_jr_stop_processing(dev, JRCR_RESET); }
> > +
> > +static int caam_reset_hw_jr(struct device *dev) {
> > +     struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
> > +     unsigned int timeout = 100000;
> > +     int err;
> > +     /*
> > +      * mask interrupts since we are going to poll
> > +      * for reset completion status
> > +      */
> > +     clrsetbits_32(&jrp->rregs->rconfig_lo, 0, JRCFG_IMSK);
> > +     err = caam_jr_flush(dev);
> > +     if (err)
> > +             return err;
> > +
> >       /* initiate reset */
> > -     timeout = 100000;
> >       wr_reg32(&jrp->rregs->jrcommand, JRCR_RESET);
> >       while ((rd_reg32(&jrp->rregs->jrcommand) & JRCR_RESET) && --
> timeout)
> >               cpu_relax();