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@xxxxxxxx>
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;
>
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