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kgdboc,kdb: Allow kdb to work on a non open console port

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If kdb is open on a serial port that is not actually a console make
sure to call the poll routines to emit and receive characters.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Acked-by: Martin Hicks <mort@sgi.com>
This commit is contained in:
Jason Wessel 2010-05-20 21:04:26 -05:00
parent 1cee5e35f1
commit efe2f29e32
3 changed files with 33 additions and 0 deletions
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14
drivers/serial/kgdboc.c
View File

@ -16,6 +16,7 @@
#include <linux/kgdb.h>
#include <linux/kdb.h>
#include <linux/tty.h>
#include <linux/console.h>
#define MAX_CONFIG_LEN 40
@ -93,12 +94,14 @@ static int configure_kgdboc(void)
int tty_line = 0;
int err;
char *cptr = config;
struct console *cons;
err = kgdboc_option_setup(config);
if (err || !strlen(config) || isspace(config[0]))
goto noconfig;
err = -ENODEV;
kgdboc_io_ops.is_console = 0;
kgdb_tty_driver = NULL;
if (kgdboc_register_kbd(&cptr))
@ -108,6 +111,17 @@ static int configure_kgdboc(void)
if (!p)
goto noconfig;
cons = console_drivers;
while (cons) {
int idx;
if (cons->device && cons->device(cons, &idx) == p &&
idx == tty_line) {
kgdboc_io_ops.is_console = 1;
break;
}
cons = cons->next;
}
kgdb_tty_driver = p;
kgdb_tty_line = tty_line;

3
include/linux/kgdb.h
View File

@ -247,6 +247,8 @@ struct kgdb_arch {
* the I/O driver.
* @post_exception: Pointer to a function that will do any cleanup work
* for the I/O driver.
* @is_console: 1 if the end device is a console 0 if the I/O device is
* not a console
*/
struct kgdb_io {
const char *name;
@ -256,6 +258,7 @@ struct kgdb_io {
int (*init) (void);
void (*pre_exception) (void);
void (*post_exception) (void);
int is_console;
};
extern struct kgdb_arch arch_kgdb_ops;

16
kernel/debug/kdb/kdb_io.c
View File

@ -673,6 +673,14 @@ int kdb_printf(const char *fmt, ...)
if (!dbg_kdb_mode && kgdb_connected) {
gdbstub_msg_write(kdb_buffer, retlen);
} else {
if (!dbg_io_ops->is_console) {
len = strlen(kdb_buffer);
cp = kdb_buffer;
while (len--) {
dbg_io_ops->write_char(*cp);
cp++;
}
}
while (c) {
c->write(c, kdb_buffer, retlen);
touch_nmi_watchdog();
@ -719,6 +727,14 @@ int kdb_printf(const char *fmt, ...)
kdb_input_flush();
c = console_drivers;
if (!dbg_io_ops->is_console) {
len = strlen(moreprompt);
cp = moreprompt;
while (len--) {
dbg_io_ops->write_char(*cp);
cp++;
}
}
while (c) {
c->write(c, moreprompt, strlen(moreprompt));
touch_nmi_watchdog();