From mboxrd@z Thu Jan 1 00:00:00 1970 From: Juergen Gross Date: Thu, 23 Mar 2017 12:53:04 +0000 Subject: [PATCH] xen, fbfront: add support for specifying size via xenstore Message-Id: <20170323125304.11891-1-jgross@suse.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org, linux-fbdev@vger.kernel.org Cc: b.zolnierkie@samsung.com, boris.ostrovsky@oracle.com, Juergen Gross 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 --- 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 #include #include @@ -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; -- 2.10.2