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kgdboc: Add call backs to allow kernel mode switching

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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: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Jason Wessel 2010-08-05 09:22:30 -05:00
parent 81d4450732
commit 408a4be1f8
1 changed files with 18 additions and 0 deletions
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18
drivers/serial/kgdboc.c
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@ -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 = {