linux-kernel - Re: [PATCH] vfio-mdev/samples: change RDI interrupt condition

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Message-ID: <1521532382.3326.5.camel@hxt-semitech.com>
Date:   Tue, 20 Mar 2018 07:53:02 +0000
From:   "Yang, Shunyong" <shunyong.yang@...-semitech.com>
To:     "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "kwankhede@...dia.com" <kwankhede@...dia.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "Zheng, Joey" <yu.zheng@...-semitech.com>
Subject: Re: [PATCH] vfio-mdev/samples: change RDI interrupt condition

Hi, Alex,

Gentle ping. Could you please help to pull this patch?
It's a small fix and Kirti has reviewed.

Thanks.
Shunyong.


On Fri, 2018-03-09 at 11:36 +0530, Kirti Wankhede wrote:
> Thanks for fixing it.
> Patch looks good to me.
> +Alex to pull this patch.
> 
> Reviewed by: Kirti Wankhede <kwankhede@...dia.com>
> 
> Thanks,
> Kirti
> 
> On 3/8/2018 12:38 PM, Shunyong Yang wrote:
> > 
> > When FIFO mode is enabled, the receive data available interrupt
> > (UART_IIR_RDI in code) should be triggered when the number of data
> > in FIFO is equal or larger than interrupt trigger level.
> > 
> > This patch changes the trigger level check to ensure multiple bytes
> > received from upper layer can trigger RDI interrupt correctly.
> > 
> > Cc: Joey Zheng <yu.zheng@...-semitech.com>
> > Signed-off-by: Shunyong Yang <shunyong.yang@...-semitech.com>
> > ---
> >  samples/vfio-mdev/mtty.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c
> > index 09f255bdf3ac..7abb79d8313d 100644
> > --- a/samples/vfio-mdev/mtty.c
> > +++ b/samples/vfio-mdev/mtty.c
> > @@ -534,7 +534,7 @@ static void handle_bar_read(unsigned int index,
> > struct mdev_state *mdev_state,
> >  
> >  		/* Interrupt priority 2: Fifo trigger level
> > reached */
> >  		if ((ier & UART_IER_RDI) &&
> > -		    (mdev_state->s[index].rxtx.count ==
> > +		    (mdev_state->s[index].rxtx.count >=
> >  		      mdev_state->s[index].intr_trigger_level))
> >  			*buf |= UART_IIR_RDI;
> >  
> >