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authorAndrzej Pietrasiewicz <andrzej.p@collabora.com>2020-08-18 14:28:24 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-10-02 15:56:06 +0300
commita27eb0cb4b2104461de1a1284059b3ac875e45b5 (patch)
tree31615afcc85607db6f7729a431310e144713186c /drivers/tty
parentfce3c5c1a2d9cd888f2987662ce17c0c651916b2 (diff)
downloadlinux-a27eb0cb4b2104461de1a1284059b3ac875e45b5.tar.xz
tty/sysrq: Extend the sysrq_key_table to cover capital letters
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>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/sysrq.c49
1 files changed, 47 insertions, 2 deletions
diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
index a8e39b2cdd55..959f9e121cc6 100644
--- a/drivers/tty/sysrq.c
+++ b/drivers/tty/sysrq.c
@@ -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;
}