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Commit 408a4be1 authored by Jason Wessel's avatar Jason Wessel
Browse files

kgdboc: Add call backs to allow kernel mode switching 



Add the kms keyword processing to kgdboc and the callbacks to invoke
console switching when ever kgdboc is started with "kgdboc=kms,kbd".

Signed-off-by: default avatarJason Wessel <jason.wessel@windriver.com>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent 81d44507

drivers/serial/kgdboc.c

+18 −0
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ 
#include <linux/kdb.h>

#include <linux/tty.h>

#include <linux/console.h>

#include <linux/vt_kern.h>



#define MAX_CONFIG_LEN		40
@@ -31,6 +32,7 @@ static struct kparam_string kps = { 
	.maxlen			= MAX_CONFIG_LEN,

};



static int kgdboc_use_kms;  /* 1 if we use kernel mode switching */

static struct tty_driver	*kgdb_tty_driver;

static int			kgdb_tty_line;
@@ -104,6 +106,12 @@ static int configure_kgdboc(void) 
	kgdboc_io_ops.is_console = 0;

	kgdb_tty_driver = NULL;



	kgdboc_use_kms = 0;

	if (strncmp(cptr, "kms,", 4) == 0) {

		cptr += 4;

		kgdboc_use_kms = 1;

	}



	if (kgdboc_register_kbd(&cptr))

		goto do_register;
@@ -201,8 +209,14 @@ static int param_set_kgdboc_var(const char *kmessage, struct kernel_param *kp) 
	return configure_kgdboc();

}



static int dbg_restore_graphics;



static void kgdboc_pre_exp_handler(void)

{

	if (!dbg_restore_graphics && kgdboc_use_kms) {

		dbg_restore_graphics = 1;

		con_debug_enter(vc_cons[fg_console].d);

	}

	/* Increment the module count when the debugger is active */

	if (!kgdb_connected)

		try_module_get(THIS_MODULE);
@@ -213,6 +227,10 @@ static void kgdboc_post_exp_handler(void) 
	/* decrement the module count when the debugger detaches */

	if (!kgdb_connected)

		module_put(THIS_MODULE);

	if (kgdboc_use_kms && dbg_restore_graphics) {

		dbg_restore_graphics = 0;

		con_debug_leave();

	}

}



static struct kgdb_io kgdboc_io_ops = {