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tty/sysrq: Extend the sysrq_key_table to cover capital letters

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All slots in sysrq_key_table[] are either used, reserved or at least
commented with their intended use. This patch adds capital letter versions
available, which means adding 26 more entries.

For already existing SysRq operations the user presses Alt-SysRq-<key>, and
for the newly added ones Alt-Shift-SysRq-<key>.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://lore.kernel.org/r/20200818112825.6445-2-andrzej.p@collabora.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andrzej Pietrasiewicz 2020-08-18 13:28:24 +02:00 committed by Greg Kroah-Hartman
parent fce3c5c1a2
commit a27eb0cb4b
3 changed files with 50 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/admin-guide/sysrq.rst
View File

@ -79,6 +79,8 @@ On all
echo t > /proc/sysrq-trigger
The :kbd:`<command key>` is case sensitive.
What are the 'command' keys?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

2
drivers/gpu/drm/drm_fb_helper.c
View File

@ -325,7 +325,7 @@ static void drm_fb_helper_sysrq(int dummy1)
static const struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
.handler = drm_fb_helper_sysrq,
.help_msg = "force-fb(V)",
.help_msg = "force-fb(v)",
.action_msg = "Restore framebuffer console",
};
#else

49
drivers/tty/sysrq.c
View File

@ -19,6 +19,7 @@
#include <linux/sched/rt.h>
#include <linux/sched/debug.h>
#include <linux/sched/task.h>
#include <linux/ctype.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/fs.h>
@ -440,7 +441,7 @@ static const struct sysrq_key_op sysrq_unrt_op = {
/* Key Operations table and lock */
static DEFINE_SPINLOCK(sysrq_key_table_lock);
static const struct sysrq_key_op *sysrq_key_table[36] = {
static const struct sysrq_key_op *sysrq_key_table[62] = {
&sysrq_loglevel_op, /* 0 */
&sysrq_loglevel_op, /* 1 */
&sysrq_loglevel_op, /* 2 */
@ -497,6 +498,32 @@ static const struct sysrq_key_op *sysrq_key_table[36] = {
/* y: May be registered on sparc64 for global register dump */
NULL, /* y */
&sysrq_ftrace_dump_op, /* z */
NULL, /* A */
NULL, /* B */
NULL, /* C */
NULL, /* D */
NULL, /* E */
NULL, /* F */
NULL, /* G */
NULL, /* H */
NULL, /* I */
NULL, /* J */
NULL, /* K */
NULL, /* L */
NULL, /* M */
NULL, /* N */
NULL, /* O */
NULL, /* P */
NULL, /* Q */
NULL, /* R */
NULL, /* S */
NULL, /* T */
NULL, /* U */
NULL, /* V */
NULL, /* W */
NULL, /* X */
NULL, /* Y */
NULL, /* Z */
};
/* key2index calculation, -1 on invalid index */
@ -508,6 +535,8 @@ static int sysrq_key_table_key2index(int key)
retval = key - '0';
else if ((key >= 'a') && (key <= 'z'))
retval = key + 10 - 'a';
else if ((key >= 'A') && (key <= 'Z'))
retval = key + 36 - 'A';
else
retval = -1;
return retval;
@ -621,6 +650,8 @@ struct sysrq_state {
unsigned long key_down[BITS_TO_LONGS(KEY_CNT)];
unsigned int alt;
unsigned int alt_use;
unsigned int shift;
unsigned int shift_use;
bool active;
bool need_reinject;
bool reinjecting;
@ -805,10 +836,20 @@ static bool sysrq_handle_keypress(struct sysrq_state *sysrq,
}
break;
case KEY_LEFTSHIFT:
case KEY_RIGHTSHIFT:
if (!value)
sysrq->shift = KEY_RESERVED;
else if (value != 2)
sysrq->shift = code;
break;
case KEY_SYSRQ:
if (value == 1 && sysrq->alt != KEY_RESERVED) {
sysrq->active = true;
sysrq->alt_use = sysrq->alt;
/* either RESERVED (for released) or actual code */
sysrq->shift_use = sysrq->shift;
/*
* If nothing else will be pressed we'll need
* to re-inject Alt-SysRq keysroke.
@ -831,8 +872,12 @@ static bool sysrq_handle_keypress(struct sysrq_state *sysrq,
default:
if (sysrq->active && value && value != 2) {
unsigned char c = sysrq_xlate[code];
sysrq->need_reinject = false;
__handle_sysrq(sysrq_xlate[code], true);
if (sysrq->shift_use != KEY_RESERVED)
c = toupper(c);
__handle_sysrq(c, true);
}
break;
}