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authorJesse Barnes <jbarnes@virtuousgeek.org>2010-08-02 12:05:41 -0700
committerJason Wessel <jason.wessel@windriver.com>2010-08-05 09:22:31 -0500
commitd219adc1228a3887486b58a430e736b0831f192c (patch)
treea734e48a573774201ab8c6c06ff6eb6de60648f1 /include/linux/fb.h
parent408a4be1f8cbee511895ee07da2a007a5a24303f (diff)
downloadlinux-linaro-stable-d219adc1228a3887486b58a430e736b0831f192c.tar.gz
fb: add hooks to handle KDB enter/exit
Add fb ops to handle enter/exit of the kernel debugger. If present, the fb core will register them with KGDB and they'll be called when the debugger is entered and exited. The new functions are responsible for switching to an appropriate debug framebuffer and restoring the interrupted state at exit time. Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Diffstat (limited to 'include/linux/fb.h')
-rw-r--r--include/linux/fb.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/fb.h b/include/linux/fb.h
index e7445df44d6c..0c5659c41b01 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -3,6 +3,9 @@
#include <linux/types.h>
#include <linux/i2c.h>
+#ifdef __KERNEL__
+#include <linux/kgdb.h>
+#endif /* __KERNEL__ */
/* Definitions of frame buffers */
@@ -607,6 +610,12 @@ struct fb_deferred_io {
* LOCKING NOTE: those functions must _ALL_ be called with the console
* semaphore held, this is the only suitable locking mechanism we have
* in 2.6. Some may be called at interrupt time at this point though.
+ *
+ * The exception to this is the debug related hooks. Putting the fb
+ * into a debug state (e.g. flipping to the kernel console) and restoring
+ * it must be done in a lock-free manner, so low level drivers should
+ * keep track of the initial console (if applicable) and may need to
+ * perform direct, unlocked hardware writes in these hooks.
*/
struct fb_ops {
@@ -676,6 +685,10 @@ struct fb_ops {
/* teardown any resources to do with this framebuffer */
void (*fb_destroy)(struct fb_info *info);
+
+ /* called at KDB enter and leave time to prepare the console */
+ int (*fb_debug_enter)(struct fb_info *info);
+ int (*fb_debug_leave)(struct fb_info *info);
};
#ifdef CONFIG_FB_TILEBLITTING