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

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Message-ID: <c14684a6-9388-e38a-c99a-a393c5bcf2a4@nvidia.com>
Date:   Fri, 9 Mar 2018 11:36:05 +0530
From:   Kirti Wankhede <kwankhede@...dia.com>
To:     Shunyong Yang <shunyong.yang@...-semitech.com>,
        Alex Williamson <alex.williamson@...hat.com>
CC:     <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Joey Zheng <yu.zheng@...-semitech.com>
Subject: Re: [PATCH] vfio-mdev/samples: change RDI interrupt condition


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;
>  
>