linux-kernel - Re: [PATCH] xen, fbfront: add support for specifying size via xenstore

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Date:   Wed, 5 Apr 2017 10:18:43 +0200
From:   Juergen Gross <jgross@...e.com>
To:     linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        linux-fbdev@...r.kernel.org, b.zolnierkie@...sung.com
Cc:     boris.ostrovsky@...cle.com
Subject: Re: [PATCH] xen, fbfront: add support for specifying size via
 xenstore

On 23/03/17 13:53, Juergen Gross wrote:
> Today xen-fbfront supports specifying the display size via module
> parameters only. Add support for specifying the size via Xenstore in
> order to enable doing this easily via the domain's Xen configuration.
> 
> Add an error message in case the configured display size conflicts
> with video memory size.
> 
> Signed-off-by: Juergen Gross <jgross@...e.com>

Bartlomiej, any comments? Can you please take this patch or should I
carry it through the Xen tree?


Juergen

> ---
>  drivers/video/fbdev/xen-fbfront.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/video/fbdev/xen-fbfront.c b/drivers/video/fbdev/xen-fbfront.c
> index 3ee309c..46f6396 100644
> --- a/drivers/video/fbdev/xen-fbfront.c
> +++ b/drivers/video/fbdev/xen-fbfront.c
> @@ -18,6 +18,8 @@
>   * frame buffer.
>   */
>  
> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> +
>  #include <linux/console.h>
>  #include <linux/kernel.h>
>  #include <linux/errno.h>
> @@ -380,10 +382,18 @@ static int xenfb_probe(struct xenbus_device *dev,
>  			video[KPARAM_MEM] = val;
>  	}
>  
> +	video[KPARAM_WIDTH] = xenbus_read_unsigned(dev->otherend, "width",
> +						   video[KPARAM_WIDTH]);
> +	video[KPARAM_HEIGHT] = xenbus_read_unsigned(dev->otherend, "height",
> +						    video[KPARAM_HEIGHT]);
> +
>  	/* If requested res does not fit in available memory, use default */
>  	fb_size = video[KPARAM_MEM] * 1024 * 1024;
>  	if (video[KPARAM_WIDTH] * video[KPARAM_HEIGHT] * XENFB_DEPTH / 8
>  	    > fb_size) {
> +		pr_warn("display parameters %d,%d,%d invalid, use defaults\n",
> +			video[KPARAM_MEM], video[KPARAM_WIDTH],
> +			video[KPARAM_HEIGHT]);
>  		video[KPARAM_WIDTH] = XENFB_WIDTH;
>  		video[KPARAM_HEIGHT] = XENFB_HEIGHT;
>  		fb_size = XENFB_DEFAULT_FB_LEN;
>