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: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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@ -17,6 +17,7 @@
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#include <linux/kdb.h>
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#include <linux/tty.h>
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#include <linux/console.h>
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#include <linux/vt_kern.h>
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#define MAX_CONFIG_LEN 40
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@ -31,6 +32,7 @@ static struct kparam_string kps = {
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.maxlen = MAX_CONFIG_LEN,
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};
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static int kgdboc_use_kms; /* 1 if we use kernel mode switching */
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static struct tty_driver *kgdb_tty_driver;
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static int kgdb_tty_line;
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@ -104,6 +106,12 @@ static int configure_kgdboc(void)
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kgdboc_io_ops.is_console = 0;
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kgdb_tty_driver = NULL;
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kgdboc_use_kms = 0;
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if (strncmp(cptr, "kms,", 4) == 0) {
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cptr += 4;
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kgdboc_use_kms = 1;
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}
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if (kgdboc_register_kbd(&cptr))
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goto do_register;
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@ -201,8 +209,14 @@ static int param_set_kgdboc_var(const char *kmessage, struct kernel_param *kp)
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return configure_kgdboc();
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}
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static int dbg_restore_graphics;
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static void kgdboc_pre_exp_handler(void)
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{
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if (!dbg_restore_graphics && kgdboc_use_kms) {
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dbg_restore_graphics = 1;
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con_debug_enter(vc_cons[fg_console].d);
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}
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/* Increment the module count when the debugger is active */
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if (!kgdb_connected)
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try_module_get(THIS_MODULE);
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@ -213,6 +227,10 @@ static void kgdboc_post_exp_handler(void)
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/* decrement the module count when the debugger detaches */
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if (!kgdb_connected)
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module_put(THIS_MODULE);
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if (kgdboc_use_kms && dbg_restore_graphics) {
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dbg_restore_graphics = 0;
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con_debug_leave();
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}
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}
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static struct kgdb_io kgdboc_io_ops = {
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