RE: [PATCH] driver: firmware: stratix10-svc: schedule thread out when there is no data reveived

From: Li, Meng
Date: Sun Nov 14 2021 - 20:54:22 EST




> -----Original Message-----
> From: Dinh Nguyen <dinguyen@xxxxxxxxxx>
> Sent: Saturday, November 13, 2021 3:35 AM
> To: Li, Meng <Meng.Li@xxxxxxxxxxxxx>; gregkh@xxxxxxxxxxxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH] driver: firmware: stratix10-svc: schedule thread out
> when there is no data reveived
>
> [Please note: This e-mail is from an EXTERNAL e-mail address]
>
> On 11/9/21 1:46 AM, Meng Li wrote:
> > From: Meng Li <meng.li@xxxxxxxxxxxxx>
> >
> > In thread svc_normal_to_secure_thread(), function
> > kfifo_out_spinlocked() always return, so this thread can't release cpu
> > even if there is no data received, and cause cpu is under heave load
> > status. System performance
>
> do you mean "heavy"?

Yes!

Thanks for fixing these typos.
I will pay more attention next time.

Regards,
Limeng

>
> > is poor.
> >
> > This issue is introduced by commit 7ca5ce896524("firmware: add Intel
> > Stratix10 service layer driver")
> >
> > Therefore, schedule this thread out when there is no data reveived,
> > and
>
> s/reveived/received
>
> > wake it up after sending data to it.
> >
> > Fixes: 7ca5ce896524 ("firmware: add Intel Stratix10 service layer
> > driver")
> > Cc: stable@xxxxxxxxxxxxxxx
> > Signed-off-by: Meng Li <Meng.Li@xxxxxxxxxxxxx>
> > ---
> > drivers/firmware/stratix10-svc.c | 5 ++++-
> > 1 file changed, 4 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/firmware/stratix10-svc.c
> > b/drivers/firmware/stratix10-svc.c
> > index 2a7687911c09..ddb86d441726 100644
> > --- a/drivers/firmware/stratix10-svc.c
> > +++ b/drivers/firmware/stratix10-svc.c
> > @@ -365,8 +365,10 @@ static int svc_normal_to_secure_thread(void
> *data)
> > pdata, sizeof(*pdata),
> > &ctrl->svc_fifo_lock);
> >
> > - if (!ret_fifo)
> > + if (!ret_fifo) {
> > +
> > + schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
> > continue;
> > + }
> >
> > pr_debug("get from FIFO pa=0x%016x, command=%u, size=%u\n",
> > (unsigned int)pdata->paddr, pdata->command, @@
> > -861,6 +863,7 @@ int stratix10_svc_send(struct stratix10_svc_chan *chan,
> void *msg)
> > ret = kfifo_in_spinlocked(&chan->ctrl->svc_fifo, p_data,
> > sizeof(*p_data),
> > &chan->ctrl->svc_fifo_lock);
> > + wake_up_process(chan->ctrl->task);
> >
> > kfree(p_data);
> >
> >
>
> I've made above spelling fixes and have applied it.
>
> Thanks,
> Dinh