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vt/console: try harder to print output when panicing

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Jesse's initial patch commit said:

"At panic time (i.e.  when oops_in_progress is set) we should try a bit
harder to update the screen and make sure output gets to the VT, since
some drivers are capable of flipping back to it.

So make sure we try to unblank and update the display if called from a
panic context."

I've enhanced this to add a flag to the vc that console layer can set to
indicate they want this behaviour to occur.  This also adds support to
fbcon for that flag and adds an fb flag for drivers to indicate they want
to use the support.  It enables this for KMS drivers.

Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Acked-by: James Simmons <jsimmons@infradead.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jesse Barnes 2010-06-23 12:56:12 -07:00 • committed by Greg Kroah-Hartman
parent 26df6d1340
commit 8fd4bd2235
8 changed files with 27 additions and 9 deletions
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4
include/linux/fb.h
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@ -825,6 +825,10 @@ struct fb_tile_ops {
*/
#define FBINFO_BE_MATH 0x100000
/* report to the VT layer that this fb driver can accept forced console
output like oopses */
#define FBINFO_CAN_FORCE_OUTPUT 0x200000
struct fb_info {
int node;
int flags;