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Subject[RFC PATCH] vt:tackle kbd_table
Date
This could do with some extra eyes and double checking. With this one out of
the day we can start to make a dent in the console locking logic and thus
eventually into tty_lock().

From: Alan Cox <alan@linux.intel.com>

Keyboard struct lifetime is easy, but the locking is not and is completely
ignored by the existing code. Tackle this one head on

- Make the kbd_table private so we can run down all direct users
- Hoick the relevant ioctl handlers into the keyboard layer
- Lock them with the keyboard lock so they don't change mid keypress
- Add helpers for things like console stop/start so we isolate the poking
around properly
- Tweak the braille console so it still builds

There are a couple of FIXME locking cases left for ioctls that are so hideous
they should be addressed in a later patch. After this patch the kbd_table is
private and all the keyboard jiggery pokery is in one place.

Signed-off-by: Alan Cox <alan@linux.intel.com>
---

drivers/accessibility/braille/braille_console.c | 9
drivers/tty/sysrq.c | 6
drivers/tty/vt/keyboard.c | 620 ++++++++++++++++++++++-
drivers/tty/vt/selection.c | 9
drivers/tty/vt/vt.c | 27 -
drivers/tty/vt/vt_ioctl.c | 325 +-----------
include/linux/kbd_kern.h | 7
include/linux/keyboard.h | 2
include/linux/vt_kern.h | 23 +
9 files changed, 655 insertions(+), 373 deletions(-)


diff --git a/drivers/accessibility/braille/braille_console.c b/drivers/accessibility/braille/braille_console.c
index c339a08..d21167b 100644
--- a/drivers/accessibility/braille/braille_console.c
+++ b/drivers/accessibility/braille/braille_console.c
@@ -244,16 +244,13 @@ static int keyboard_notifier_call(struct notifier_block *blk,

switch (val) {
case KVAL(K_CAPS):
- on_off = vc_kbd_led(kbd_table + fg_console,
- VC_CAPSLOCK);
+ on_off = vt_get_leds(fg_console, VC_CAPSLOCK);
break;
case KVAL(K_NUM):
- on_off = vc_kbd_led(kbd_table + fg_console,
- VC_NUMLOCK);
+ on_off = vt_get_leds(fg_console, VC_NUMLOCK);
break;
case KVAL(K_HOLD):
- on_off = vc_kbd_led(kbd_table + fg_console,
- VC_SCROLLOCK);
+ on_off = vt_get_leds(fg_console, VC_SCROLLOCK);
break;
}
if (on_off == 1)
diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
index 8db9125..ecb8e22 100644
--- a/drivers/tty/sysrq.c
+++ b/drivers/tty/sysrq.c
@@ -110,11 +110,9 @@ static struct sysrq_key_op sysrq_SAK_op = {
#ifdef CONFIG_VT
static void sysrq_handle_unraw(int key)
{
- struct kbd_struct *kbd = &kbd_table[fg_console];
-
- if (kbd)
- kbd->kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE;
+ vt_reset_unicode(fg_console);
}
+
static struct sysrq_key_op sysrq_unraw_op = {
.handler = sysrq_handle_unraw,
.help_msg = "unRaw",
diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c
index 0479114..8a401e6 100644
--- a/drivers/tty/vt/keyboard.c
+++ b/drivers/tty/vt/keyboard.c
@@ -67,8 +67,6 @@ extern void ctrl_alt_del(void);

#define KBD_DEFLOCK 0

-void compute_shiftstate(void);
-
/*
* Handler Tables.
*/
@@ -99,35 +97,29 @@ static fn_handler_fn *fn_handler[] = { FN_HANDLERS };
* Variables exported for vt_ioctl.c
*/

-/* maximum values each key_handler can handle */
-const int max_vals[] = {
- 255, ARRAY_SIZE(func_table) - 1, ARRAY_SIZE(fn_handler) - 1, NR_PAD - 1,
- NR_DEAD - 1, 255, 3, NR_SHIFT - 1, 255, NR_ASCII - 1, NR_LOCK - 1,
- 255, NR_LOCK - 1, 255, NR_BRL - 1
-};
-
-const int NR_TYPES = ARRAY_SIZE(max_vals);
-
-struct kbd_struct kbd_table[MAX_NR_CONSOLES];
-EXPORT_SYMBOL_GPL(kbd_table);
-static struct kbd_struct *kbd = kbd_table;
-
struct vt_spawn_console vt_spawn_con = {
.lock = __SPIN_LOCK_UNLOCKED(vt_spawn_con.lock),
.pid = NULL,
.sig = 0,
};

-/*
- * Variables exported for vt.c
- */
-
-int shift_state = 0;

/*
* Internal Data.
*/

+static struct kbd_struct kbd_table[MAX_NR_CONSOLES];
+static struct kbd_struct *kbd = kbd_table;
+
+/* maximum values each key_handler can handle */
+static const int max_vals[] = {
+ 255, ARRAY_SIZE(func_table) - 1, ARRAY_SIZE(fn_handler) - 1, NR_PAD - 1,
+ NR_DEAD - 1, 255, 3, NR_SHIFT - 1, 255, NR_ASCII - 1, NR_LOCK - 1,
+ 255, NR_LOCK - 1, 255, NR_BRL - 1
+};
+
+static const int NR_TYPES = ARRAY_SIZE(max_vals);
+
static struct input_handler kbd_handler;
static DEFINE_SPINLOCK(kbd_event_lock);
static unsigned long key_down[BITS_TO_LONGS(KEY_CNT)]; /* keyboard key bitmap */
@@ -137,6 +129,8 @@ static int npadch = -1; /* -1 or number assembled on pad */
static unsigned int diacr;
static char rep; /* flag telling character repeat */

+static int shift_state = 0;
+
static unsigned char ledstate = 0xff; /* undefined */
static unsigned char ledioctl;

@@ -187,7 +181,7 @@ static int getkeycode_helper(struct input_handle *handle, void *data)
return d->error == 0; /* stop as soon as we successfully get one */
}

-int getkeycode(unsigned int scancode)
+static int getkeycode(unsigned int scancode)
{
struct getset_keycode_data d = {
.ke = {
@@ -214,7 +208,7 @@ static int setkeycode_helper(struct input_handle *handle, void *data)
return d->error == 0; /* stop as soon as we successfully set one */
}

-int setkeycode(unsigned int scancode, unsigned int keycode)
+static int setkeycode(unsigned int scancode, unsigned int keycode)
{
struct getset_keycode_data d = {
.ke = {
@@ -382,9 +376,11 @@ static void to_utf8(struct vc_data *vc, uint c)
/*
* Called after returning from RAW mode or when changing consoles - recompute
* shift_down[] and shift_state from key_down[] maybe called when keymap is
- * undefined, so that shiftkey release is seen
+ * undefined, so that shiftkey release is seen. The caller must hold the
+ * kbd_event_lock.
*/
-void compute_shiftstate(void)
+
+static void do_compute_shiftstate(void)
{
unsigned int i, j, k, sym, val;

@@ -417,6 +413,15 @@ void compute_shiftstate(void)
}
}

+/* We still have to export this method to vt.c */
+void compute_shiftstate(void)
+{
+ unsigned long flags;
+ spin_lock_irqsave(&kbd_event_lock, flags);
+ do_compute_shiftstate();
+ spin_unlock_irqrestore(&kbd_event_lock, flags);
+}
+
/*
* We have a combining character DIACR here, followed by the character CH.
* If the combination occurs in the table, return the corresponding value.
@@ -636,7 +641,7 @@ static void fn_SAK(struct vc_data *vc)

static void fn_null(struct vc_data *vc)
{
- compute_shiftstate();
+ do_compute_shiftstate();
}

/*
@@ -989,6 +994,8 @@ unsigned char getledstate(void)

void setledstate(struct kbd_struct *kbd, unsigned int led)
{
+ unsigned long flags;
+ spin_lock_irqsave(&kbd_event_lock, flags);
if (!(led & ~7)) {
ledioctl = led;
kbd->ledmode = LED_SHOW_IOCTL;
@@ -996,6 +1003,7 @@ void setledstate(struct kbd_struct *kbd, unsigned int led)
kbd->ledmode = LED_SHOW_FLAGS;

set_leds();
+ spin_unlock_irqrestore(&kbd_event_lock, flags);
}

static inline unsigned char getleds(void)
@@ -1035,6 +1043,75 @@ static int kbd_update_leds_helper(struct input_handle *handle, void *data)
return 0;
}

+/**
+ * vt_get_leds - helper for braille console
+ * @console: console to read
+ * @flag: flag we want to check
+ *
+ * Check the status of a keyboard led flag and report it back
+ */
+int vt_get_leds(int console, int flag)
+{
+ unsigned long flags;
+ struct kbd_struct * kbd = kbd_table + console;
+ int ret;
+
+ spin_lock_irqsave(&kbd_event_lock, flags);
+ ret = vc_kbd_led(kbd, flag);
+ spin_unlock_irqrestore(&kbd_event_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(vt_get_leds);
+
+/**
+ * vt_set_led_state - set LED state of a console
+ * @console: console to set
+ * @leds: LED bits
+ *
+ * Set the LEDs on a console. This is a wrapper for the VT layer
+ * so that we can keep kbd knowledge internal
+ */
+void vt_set_led_state(int console, int leds)
+{
+ struct kbd_struct * kbd = kbd_table + console;
+ setledstate(kbd, leds);
+}
+
+/**
+ * vt_kbd_con_start - Keyboard side of console start
+ * @console: console
+ *
+ * Handle console start. This is a wrapper for the VT layer
+ * so that we can keep kbd knowledge internal
+ */
+void vt_kbd_con_start(int console)
+{
+ struct kbd_struct * kbd = kbd_table + console;
+ unsigned long flags;
+ spin_lock_irqsave(&kbd_event_lock, flags);
+ clr_vc_kbd_led(kbd, VC_SCROLLOCK);
+ set_leds();
+ spin_unlock_irqrestore(&kbd_event_lock, flags);
+}
+
+/**
+ * vt_kbd_con_stop - Keyboard side of console stop
+ * @console: console
+ *
+ * Handle console stop. This is a wrapper for the VT layer
+ * so that we can keep kbd knowledge internal
+ */
+void vt_kbd_con_stop(int console)
+{
+ struct kbd_struct * kbd = kbd_table + console;
+ unsigned long flags;
+ spin_lock_irqsave(&kbd_event_lock, flags);
+ set_vc_kbd_led(kbd, VC_SCROLLOCK);
+ set_leds();
+ spin_unlock_irqrestore(&kbd_event_lock, flags);
+}
+
/*
* This is the tasklet that updates LED state on all keyboards
* attached to the box. The reason we use tasklet is that we
@@ -1254,7 +1331,7 @@ static void kbd_keycode(unsigned int keycode, int down, int hw_raw)
if (rc == NOTIFY_STOP || !key_map) {
atomic_notifier_call_chain(&keyboard_notifier_list,
KBD_UNBOUND_KEYCODE, &param);
- compute_shiftstate();
+ do_compute_shiftstate();
kbd->slockstate = 0;
return;
}
@@ -1614,3 +1691,494 @@ int vt_do_diacrit(unsigned int cmd, void __user *up, int perm)
}
return ret;
}
+
+/**
+ * vt_do_kdskbmode - set keyboard mode ioctl
+ * @console: the console to use
+ * @arg: the requested mode
+ *
+ * Update the keyboard mode bits while holding the correct locks.
+ * Return 0 for success or an error code.
+ */
+int vt_do_kdskbmode(int console, unsigned int arg)
+{
+ struct kbd_struct * kbd = kbd_table + console;
+ int ret = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&kbd_event_lock, flags);
+ switch(arg) {
+ case K_RAW:
+ kbd->kbdmode = VC_RAW;
+ break;
+ case K_MEDIUMRAW:
+ kbd->kbdmode = VC_MEDIUMRAW;
+ break;
+ case K_XLATE:
+ kbd->kbdmode = VC_XLATE;
+ do_compute_shiftstate();
+ break;
+ case K_UNICODE:
+ kbd->kbdmode = VC_UNICODE;
+ do_compute_shiftstate();
+ break;
+ case K_OFF:
+ kbd->kbdmode = VC_OFF;
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ spin_unlock_irqrestore(&kbd_event_lock, flags);
+ return ret;
+}
+
+/**
+ * vt_do_kdskbmeta - set keyboard meta state
+ * @console: the console to use
+ * @arg: the requested meta state
+ *
+ * Update the keyboard meta bits while holding the correct locks.
+ * Return 0 for success or an error code.
+ */
+int vt_do_kdskbmeta(int console, unsigned int arg)
+{
+ struct kbd_struct * kbd = kbd_table + console;
+ int ret = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&kbd_event_lock, flags);
+ switch(arg) {
+ case K_METABIT:
+ clr_vc_kbd_mode(kbd, VC_META);
+ break;
+ case K_ESCPREFIX:
+ set_vc_kbd_mode(kbd, VC_META);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ spin_unlock_irqrestore(&kbd_event_lock, flags);
+ return ret;
+}
+
+int vt_do_kbkeycode_ioctl(int cmd, struct kbkeycode __user *user_kbkc,
+ int perm)
+{
+ struct kbkeycode tmp;
+ int kc = 0;
+
+ if (copy_from_user(&tmp, user_kbkc, sizeof(struct kbkeycode)))
+ return -EFAULT;
+ switch (cmd) {
+ case KDGETKEYCODE:
+ kc = getkeycode(tmp.scancode);
+ if (kc >= 0)
+ kc = put_user(kc, &user_kbkc->keycode);
+ break;
+ case KDSETKEYCODE:
+ if (!perm)
+ return -EPERM;
+ kc = setkeycode(tmp.scancode, tmp.keycode);
+ break;
+ }
+ return kc;
+}
+
+#define i (tmp.kb_index)
+#define s (tmp.kb_table)
+#define v (tmp.kb_value)
+
+int vt_do_kdsk_ioctl(int cmd, struct kbentry __user *user_kbe, int perm,
+ int console)
+{
+ struct kbd_struct * kbd = kbd_table + console;
+ struct kbentry tmp;
+ ushort *key_map, *new_map, val, ov;
+ unsigned long flags;
+
+ if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry)))
+ return -EFAULT;
+
+ if (!capable(CAP_SYS_TTY_CONFIG))
+ perm = 0;
+
+ switch (cmd) {
+ case KDGKBENT:
+ /* Ensure another thread doesn't free it under us */
+ spin_lock_irqsave(&kbd_event_lock, flags);
+ key_map = key_maps[s];
+ if (key_map) {
+ val = U(key_map[i]);
+ if (kbd->kbdmode != VC_UNICODE && KTYP(val) >= NR_TYPES)
+ val = K_HOLE;
+ } else
+ val = (i ? K_HOLE : K_NOSUCHMAP);
+ spin_unlock_irqrestore(&kbd_event_lock, flags);
+ return put_user(val, &user_kbe->kb_value);
+ case KDSKBENT:
+ if (!perm)
+ return -EPERM;
+ if (!i && v == K_NOSUCHMAP) {
+ spin_lock_irqsave(&kbd_event_lock, flags);
+ /* deallocate map */
+ key_map = key_maps[s];
+ if (s && key_map) {
+ key_maps[s] = NULL;
+ if (key_map[0] == U(K_ALLOCATED)) {
+ kfree(key_map);
+ keymap_count--;
+ }
+ }
+ spin_unlock_irqrestore(&kbd_event_lock, flags);
+ break;
+ }
+
+ if (KTYP(v) < NR_TYPES) {
+ if (KVAL(v) > max_vals[KTYP(v)])
+ return -EINVAL;
+ } else
+ if (kbd->kbdmode != VC_UNICODE)
+ return -EINVAL;
+
+ /* ++Geert: non-PC keyboards may generate keycode zero */
+#if !defined(__mc68000__) && !defined(__powerpc__)
+ /* assignment to entry 0 only tests validity of args */
+ if (!i)
+ break;
+#endif
+
+ new_map = kmalloc(sizeof(plain_map), GFP_KERNEL);
+ if (!new_map)
+ return -ENOMEM;
+ spin_lock_irqsave(&kbd_event_lock, flags);
+ key_map = key_maps[s];
+ if (key_map == NULL) {
+ int j;
+
+ if (keymap_count >= MAX_NR_OF_USER_KEYMAPS &&
+ !capable(CAP_SYS_RESOURCE)) {
+ spin_unlock_irqrestore(&kbd_event_lock, flags);
+ return -EPERM;
+ }
+ key_maps[s] = new_map;
+ key_map[0] = U(K_ALLOCATED);
+ for (j = 1; j < NR_KEYS; j++)
+ key_map[j] = U(K_HOLE);
+ keymap_count++;
+ } else
+ kfree(new_map);
+
+ ov = U(key_map[i]);
+ if (v == ov)
+ goto out;
+ /*
+ * Attention Key.
+ */
+ if (((ov == K_SAK) || (v == K_SAK)) && !capable(CAP_SYS_ADMIN)) {
+ spin_unlock_irqrestore(&kbd_event_lock, flags);
+ return -EPERM;
+ }
+ key_map[i] = U(v);
+ if (!s && (KTYP(ov) == KT_SHIFT || KTYP(v) == KT_SHIFT))
+ do_compute_shiftstate();
+out:
+ spin_unlock_irqrestore(&kbd_event_lock, flags);
+ break;
+ }
+ return 0;
+}
+#undef i
+#undef s
+#undef v
+
+/* FIXME: This one needs untangling and locking */
+int vt_do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm)
+{
+ struct kbsentry *kbs;
+ char *p;
+ u_char *q;
+ u_char __user *up;
+ int sz;
+ int delta;
+ char *first_free, *fj, *fnw;
+ int i, j, k;
+ int ret;
+
+ if (!capable(CAP_SYS_TTY_CONFIG))
+ perm = 0;
+
+ kbs = kmalloc(sizeof(*kbs), GFP_KERNEL);
+ if (!kbs) {
+ ret = -ENOMEM;
+ goto reterr;
+ }
+
+ /* we mostly copy too much here (512bytes), but who cares ;) */
+ if (copy_from_user(kbs, user_kdgkb, sizeof(struct kbsentry))) {
+ ret = -EFAULT;
+ goto reterr;
+ }
+ kbs->kb_string[sizeof(kbs->kb_string)-1] = '\0';
+ i = kbs->kb_func;
+
+ switch (cmd) {
+ case KDGKBSENT:
+ sz = sizeof(kbs->kb_string) - 1; /* sz should have been
+ a struct member */
+ up = user_kdgkb->kb_string;
+ p = func_table[i];
+ if(p)
+ for ( ; *p && sz; p++, sz--)
+ if (put_user(*p, up++)) {
+ ret = -EFAULT;
+ goto reterr;
+ }
+ if (put_user('\0', up)) {
+ ret = -EFAULT;
+ goto reterr;
+ }
+ kfree(kbs);
+ return ((p && *p) ? -EOVERFLOW : 0);
+ case KDSKBSENT:
+ if (!perm) {
+ ret = -EPERM;
+ goto reterr;
+ }
+
+ q = func_table[i];
+ first_free = funcbufptr + (funcbufsize - funcbufleft);
+ for (j = i+1; j < MAX_NR_FUNC && !func_table[j]; j++)
+ ;
+ if (j < MAX_NR_FUNC)
+ fj = func_table[j];
+ else
+ fj = first_free;
+
+ delta = (q ? -strlen(q) : 1) + strlen(kbs->kb_string);
+ if (delta <= funcbufleft) { /* it fits in current buf */
+ if (j < MAX_NR_FUNC) {
+ memmove(fj + delta, fj, first_free - fj);
+ for (k = j; k < MAX_NR_FUNC; k++)
+ if (func_table[k])
+ func_table[k] += delta;
+ }
+ if (!q)
+ func_table[i] = fj;
+ funcbufleft -= delta;
+ } else { /* allocate a larger buffer */
+ sz = 256;
+ while (sz < funcbufsize - funcbufleft + delta)
+ sz <<= 1;
+ fnw = kmalloc(sz, GFP_KERNEL);
+ if(!fnw) {
+ ret = -ENOMEM;
+ goto reterr;
+ }
+
+ if (!q)
+ func_table[i] = fj;
+ if (fj > funcbufptr)
+ memmove(fnw, funcbufptr, fj - funcbufptr);
+ for (k = 0; k < j; k++)
+ if (func_table[k])
+ func_table[k] = fnw + (func_table[k] - funcbufptr);
+
+ if (first_free > fj) {
+ memmove(fnw + (fj - funcbufptr) + delta, fj, first_free - fj);
+ for (k = j; k < MAX_NR_FUNC; k++)
+ if (func_table[k])
+ func_table[k] = fnw + (func_table[k] - funcbufptr) + delta;
+ }
+ if (funcbufptr != func_buf)
+ kfree(funcbufptr);
+ funcbufptr = fnw;
+ funcbufleft = funcbufleft - delta + sz - funcbufsize;
+ funcbufsize = sz;
+ }
+ strcpy(func_table[i], kbs->kb_string);
+ break;
+ }
+ ret = 0;
+reterr:
+ kfree(kbs);
+ return ret;
+}
+
+int vt_do_kdskled(int console, int cmd, unsigned long arg, int perm)
+{
+ struct kbd_struct * kbd = kbd_table + console;
+ unsigned long flags;
+ unsigned char ucval;
+
+ switch(cmd) {
+ /* the ioctls below read/set the flags usually shown in the leds */
+ /* don't use them - they will go away without warning */
+ case KDGKBLED:
+ spin_lock_irqsave(&kbd_event_lock, flags);
+ ucval = kbd->ledflagstate | (kbd->default_ledflagstate << 4);
+ spin_unlock_irqrestore(&kbd_event_lock, flags);
+ return put_user(ucval, (char __user *)arg);
+
+ case KDSKBLED:
+ if (!perm)
+ return -EPERM;
+ if (arg & ~0x77)
+ return -EINVAL;
+ spin_lock_irqsave(&kbd_event_lock, flags);
+ kbd->ledflagstate = (arg & 7);
+ kbd->default_ledflagstate = ((arg >> 4) & 7);
+ set_leds();
+ spin_unlock_irqrestore(&kbd_event_lock, flags);
+ break;
+
+ /* the ioctls below only set the lights, not the functions */
+ /* for those, see KDGKBLED and KDSKBLED above */
+ case KDGETLED:
+ ucval = getledstate();
+ return put_user(ucval, (char __user *)arg);
+
+ case KDSETLED:
+ if (!perm)
+ return -EPERM;
+ setledstate(kbd, arg);
+ return 0;
+ }
+ return -ENOIOCTLCMD;
+}
+
+int vt_do_kdgkbmode(int console)
+{
+ struct kbd_struct * kbd = kbd_table + console;
+ /* This is a spot read so needs no locking */
+ switch (kbd->kbdmode) {
+ case VC_RAW:
+ return K_RAW;
+ case VC_MEDIUMRAW:
+ return K_MEDIUMRAW;
+ case VC_UNICODE:
+ return K_UNICODE;
+ case VC_OFF:
+ return K_OFF;
+ default:
+ return K_XLATE;
+ }
+}
+
+/**
+ * vt_do_kdgkbmeta - report meta status
+ * @console: console to report
+ *
+ * Report the meta flag status of this console
+ */
+int vt_do_kdgkbmeta(int console)
+{
+ struct kbd_struct * kbd = kbd_table + console;
+ /* Again a spot read so no locking */
+ return vc_kbd_mode(kbd, VC_META) ? K_ESCPREFIX : K_METABIT;
+}
+
+/**
+ * vt_reset_unicode - reset the unicode status
+ * @console: console being reset
+ *
+ * Restore the unicode console state to its default
+ */
+void vt_reset_unicode(int console)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&kbd_event_lock, flags);
+ kbd_table[console].kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE;
+ spin_unlock_irqrestore(&kbd_event_lock, flags);
+}
+
+/**
+ * vt_get_shiftstate - shift bit state
+ *
+ * Report the shift bits from the keyboard state. We have to export
+ * this to support some oddities in the vt layer.
+ */
+int vt_get_shift_state(void)
+{
+ /* Don't lock as this is a transient report */
+ return shift_state;
+}
+
+/**
+ * vt_reset_keyboard - reset keyboard state
+ * @console: console to reset
+ *
+ * Reset the keyboard bits for a console as part of a general console
+ * reset event
+ */
+void vt_reset_keyboard(int console)
+{
+ struct kbd_struct * kbd = kbd_table + console;
+ unsigned long flags;
+
+ spin_lock_irqsave(&kbd_event_lock, flags);
+ set_vc_kbd_mode(kbd, VC_REPEAT);
+ clr_vc_kbd_mode(kbd, VC_CKMODE);
+ clr_vc_kbd_mode(kbd, VC_APPLIC);
+ clr_vc_kbd_mode(kbd, VC_CRLF);
+ kbd->lockstate = 0;
+ kbd->slockstate = 0;
+ kbd->ledmode = LED_SHOW_FLAGS;
+ kbd->ledflagstate = kbd->default_ledflagstate;
+ /* do not do set_leds here because this causes an endless tasklet loop
+ when the keyboard hasn't been initialized yet */
+ spin_unlock_irqrestore(&kbd_event_lock, flags);
+}
+
+/**
+ * vt_get_kbd_mode_bit - read keyboard status bits
+ * @console: console to read from
+ * @bit: mode bit to read
+ *
+ * Report back a vt mode bit. We do this without locking so the
+ * caller must be sure that there are no synchronization needs
+ */
+
+int vt_get_kbd_mode_bit(int console, int bit)
+{
+ struct kbd_struct * kbd = kbd_table + console;
+ return vc_kbd_mode(kbd, bit);
+}
+
+/**
+ * vt_set_kbd_mode_bit - read keyboard status bits
+ * @console: console to read from
+ * @bit: mode bit to read
+ *
+ * Set a vt mode bit. We do this without locking so the
+ * caller must be sure that there are no synchronization needs
+ */
+
+void vt_set_kbd_mode_bit(int console, int bit)
+{
+ struct kbd_struct * kbd = kbd_table + console;
+ unsigned long flags;
+
+ spin_lock_irqsave(&kbd_event_lock, flags);
+ set_vc_kbd_mode(kbd, bit);
+ spin_unlock_irqrestore(&kbd_event_lock, flags);
+}
+
+/**
+ * vt_clr_kbd_mode_bit - read keyboard status bits
+ * @console: console to read from
+ * @bit: mode bit to read
+ *
+ * Report back a vt mode bit. We do this without locking so the
+ * caller must be sure that there are no synchronization needs
+ */
+
+void vt_clr_kbd_mode_bit(int console, int bit)
+{
+ struct kbd_struct * kbd = kbd_table + console;
+ unsigned long flags;
+
+ spin_lock_irqsave(&kbd_event_lock, flags);
+ clr_vc_kbd_mode(kbd, bit);
+ spin_unlock_irqrestore(&kbd_event_lock, flags);
+}
diff --git a/drivers/tty/vt/selection.c b/drivers/tty/vt/selection.c
index 7a0a12a..738e45a 100644
--- a/drivers/tty/vt/selection.c
+++ b/drivers/tty/vt/selection.c
@@ -30,6 +30,7 @@

extern void poke_blanked_console(void);

+/* FIXME: all this needs locking */
/* Variables for selection control. */
/* Use a dynamic buffer, instead of static (Dec 1994) */
struct vc_data *sel_cons; /* must not be deallocated */
@@ -138,7 +139,7 @@ int set_selection(const struct tiocl_selection __user *sel, struct tty_struct *t
char *bp, *obp;
int i, ps, pe, multiplier;
u16 c;
- struct kbd_struct *kbd = kbd_table + fg_console;
+ int mode;

poke_blanked_console();

@@ -182,7 +183,11 @@ int set_selection(const struct tiocl_selection __user *sel, struct tty_struct *t
clear_selection();
sel_cons = vc_cons[fg_console].d;
}
- use_unicode = kbd && kbd->kbdmode == VC_UNICODE;
+ mode = vt_do_kdgkbmode(fg_console);
+ if (mode == K_UNICODE)
+ use_unicode = 1;
+ else
+ use_unicode = 0;

switch (sel_mode)
{
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 3c7c56b..8205578 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -1028,9 +1028,9 @@ void vc_deallocate(unsigned int currcons)
* VT102 emulator
*/

-#define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
-#define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
-#define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
+#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
+#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
+#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))

#define decarm VC_REPEAT
#define decckm VC_CKMODE
@@ -1652,16 +1652,7 @@ static void reset_terminal(struct vc_data *vc, int do_clear)
vc->vc_deccm = global_cursor_default;
vc->vc_decim = 0;

- set_kbd(vc, decarm);
- clr_kbd(vc, decckm);
- clr_kbd(vc, kbdapplic);
- clr_kbd(vc, lnm);
- kbd_table[vc->vc_num].lockstate = 0;
- kbd_table[vc->vc_num].slockstate = 0;
- kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
- kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
- /* do not do set_leds here because this causes an endless tasklet loop
- when the keyboard hasn't been initialized yet */
+ vt_reset_keyboard(vc->vc_num);

vc->vc_cursor_type = cur_default;
vc->vc_complement_mask = vc->vc_s_complement_mask;
@@ -1979,7 +1970,7 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
case 'q': /* DECLL - but only 3 leds */
/* map 0,1,2,3 to 0,1,2,4 */
if (vc->vc_par[0] < 4)
- setledstate(kbd_table + vc->vc_num,
+ vt_set_led_state(vc->vc_num,
(vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
return;
case 'r':
@@ -2642,7 +2633,7 @@ int tioclinux(struct tty_struct *tty, unsigned long arg)
* kernel-internal variable; programs not closely
* related to the kernel should not use this.
*/
- data = shift_state;
+ data = vt_get_shift_state();
ret = __put_user(data, p);
break;
case TIOCL_GETMOUSEREPORTING:
@@ -2753,8 +2744,7 @@ static void con_stop(struct tty_struct *tty)
console_num = tty->index;
if (!vc_cons_allocated(console_num))
return;
- set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
- set_leds();
+ vt_kbd_con_stop(console_num);
}

/*
@@ -2768,8 +2758,7 @@ static void con_start(struct tty_struct *tty)
console_num = tty->index;
if (!vc_cons_allocated(console_num))
return;
- clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
- set_leds();
+ vt_kbd_con_start(console_num);
}

static void con_flush_chars(struct tty_struct *tty)
diff --git a/drivers/tty/vt/vt_ioctl.c b/drivers/tty/vt/vt_ioctl.c
index 80af0f9..28ca0aa 100644
--- a/drivers/tty/vt/vt_ioctl.c
+++ b/drivers/tty/vt/vt_ioctl.c
@@ -195,232 +195,7 @@ int vt_waitactive(int n)
#define GPLAST 0x3df
#define GPNUM (GPLAST - GPFIRST + 1)

-#define i (tmp.kb_index)
-#define s (tmp.kb_table)
-#define v (tmp.kb_value)
-static inline int
-do_kdsk_ioctl(int cmd, struct kbentry __user *user_kbe, int perm, struct kbd_struct *kbd)
-{
- struct kbentry tmp;
- ushort *key_map, val, ov;
-
- if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry)))
- return -EFAULT;
-
- if (!capable(CAP_SYS_TTY_CONFIG))
- perm = 0;
-
- switch (cmd) {
- case KDGKBENT:
- key_map = key_maps[s];
- if (key_map) {
- val = U(key_map[i]);
- if (kbd->kbdmode != VC_UNICODE && KTYP(val) >= NR_TYPES)
- val = K_HOLE;
- } else
- val = (i ? K_HOLE : K_NOSUCHMAP);
- return put_user(val, &user_kbe->kb_value);
- case KDSKBENT:
- if (!perm)
- return -EPERM;
- if (!i && v == K_NOSUCHMAP) {
- /* deallocate map */
- key_map = key_maps[s];
- if (s && key_map) {
- key_maps[s] = NULL;
- if (key_map[0] == U(K_ALLOCATED)) {
- kfree(key_map);
- keymap_count--;
- }
- }
- break;
- }
-
- if (KTYP(v) < NR_TYPES) {
- if (KVAL(v) > max_vals[KTYP(v)])
- return -EINVAL;
- } else
- if (kbd->kbdmode != VC_UNICODE)
- return -EINVAL;
-
- /* ++Geert: non-PC keyboards may generate keycode zero */
-#if !defined(__mc68000__) && !defined(__powerpc__)
- /* assignment to entry 0 only tests validity of args */
- if (!i)
- break;
-#endif
-
- if (!(key_map = key_maps[s])) {
- int j;
-
- if (keymap_count >= MAX_NR_OF_USER_KEYMAPS &&
- !capable(CAP_SYS_RESOURCE))
- return -EPERM;
-
- key_map = kmalloc(sizeof(plain_map),
- GFP_KERNEL);
- if (!key_map)
- return -ENOMEM;
- key_maps[s] = key_map;
- key_map[0] = U(K_ALLOCATED);
- for (j = 1; j < NR_KEYS; j++)
- key_map[j] = U(K_HOLE);
- keymap_count++;
- }
- ov = U(key_map[i]);
- if (v == ov)
- break; /* nothing to do */
- /*
- * Attention Key.
- */
- if (((ov == K_SAK) || (v == K_SAK)) && !capable(CAP_SYS_ADMIN))
- return -EPERM;
- key_map[i] = U(v);
- if (!s && (KTYP(ov) == KT_SHIFT || KTYP(v) == KT_SHIFT))
- compute_shiftstate();
- break;
- }
- return 0;
-}
-#undef i
-#undef s
-#undef v
-
-static inline int
-do_kbkeycode_ioctl(int cmd, struct kbkeycode __user *user_kbkc, int perm)
-{
- struct kbkeycode tmp;
- int kc = 0;
-
- if (copy_from_user(&tmp, user_kbkc, sizeof(struct kbkeycode)))
- return -EFAULT;
- switch (cmd) {
- case KDGETKEYCODE:
- kc = getkeycode(tmp.scancode);
- if (kc >= 0)
- kc = put_user(kc, &user_kbkc->keycode);
- break;
- case KDSETKEYCODE:
- if (!perm)
- return -EPERM;
- kc = setkeycode(tmp.scancode, tmp.keycode);
- break;
- }
- return kc;
-}
-
-static inline int
-do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm)
-{
- struct kbsentry *kbs;
- char *p;
- u_char *q;
- u_char __user *up;
- int sz;
- int delta;
- char *first_free, *fj, *fnw;
- int i, j, k;
- int ret;
-
- if (!capable(CAP_SYS_TTY_CONFIG))
- perm = 0;
-
- kbs = kmalloc(sizeof(*kbs), GFP_KERNEL);
- if (!kbs) {
- ret = -ENOMEM;
- goto reterr;
- }
-
- /* we mostly copy too much here (512bytes), but who cares ;) */
- if (copy_from_user(kbs, user_kdgkb, sizeof(struct kbsentry))) {
- ret = -EFAULT;
- goto reterr;
- }
- kbs->kb_string[sizeof(kbs->kb_string)-1] = '\0';
- i = kbs->kb_func;
-
- switch (cmd) {
- case KDGKBSENT:
- sz = sizeof(kbs->kb_string) - 1; /* sz should have been
- a struct member */
- up = user_kdgkb->kb_string;
- p = func_table[i];
- if(p)
- for ( ; *p && sz; p++, sz--)
- if (put_user(*p, up++)) {
- ret = -EFAULT;
- goto reterr;
- }
- if (put_user('\0', up)) {
- ret = -EFAULT;
- goto reterr;
- }
- kfree(kbs);
- return ((p && *p) ? -EOVERFLOW : 0);
- case KDSKBSENT:
- if (!perm) {
- ret = -EPERM;
- goto reterr;
- }

- q = func_table[i];
- first_free = funcbufptr + (funcbufsize - funcbufleft);
- for (j = i+1; j < MAX_NR_FUNC && !func_table[j]; j++)
- ;
- if (j < MAX_NR_FUNC)
- fj = func_table[j];
- else
- fj = first_free;
-
- delta = (q ? -strlen(q) : 1) + strlen(kbs->kb_string);
- if (delta <= funcbufleft) { /* it fits in current buf */
- if (j < MAX_NR_FUNC) {
- memmove(fj + delta, fj, first_free - fj);
- for (k = j; k < MAX_NR_FUNC; k++)
- if (func_table[k])
- func_table[k] += delta;
- }
- if (!q)
- func_table[i] = fj;
- funcbufleft -= delta;
- } else { /* allocate a larger buffer */
- sz = 256;
- while (sz < funcbufsize - funcbufleft + delta)
- sz <<= 1;
- fnw = kmalloc(sz, GFP_KERNEL);
- if(!fnw) {
- ret = -ENOMEM;
- goto reterr;
- }
-
- if (!q)
- func_table[i] = fj;
- if (fj > funcbufptr)
- memmove(fnw, funcbufptr, fj - funcbufptr);
- for (k = 0; k < j; k++)
- if (func_table[k])
- func_table[k] = fnw + (func_table[k] - funcbufptr);
-
- if (first_free > fj) {
- memmove(fnw + (fj - funcbufptr) + delta, fj, first_free - fj);
- for (k = j; k < MAX_NR_FUNC; k++)
- if (func_table[k])
- func_table[k] = fnw + (func_table[k] - funcbufptr) + delta;
- }
- if (funcbufptr != func_buf)
- kfree(funcbufptr);
- funcbufptr = fnw;
- funcbufleft = funcbufleft - delta + sz - funcbufsize;
- funcbufsize = sz;
- }
- strcpy(func_table[i], kbs->kb_string);
- break;
- }
- ret = 0;
-reterr:
- kfree(kbs);
- return ret;
-}

static inline int
do_fontx_ioctl(int cmd, struct consolefontdesc __user *user_cfd, int perm, struct console_font_op *op)
@@ -497,7 +272,6 @@ int vt_ioctl(struct tty_struct *tty,
{
struct vc_data *vc = tty->driver_data;
struct console_font_op op; /* used in multiple places here */
- struct kbd_struct * kbd;
unsigned int console;
unsigned char ucval;
unsigned int uival;
@@ -523,7 +297,6 @@ int vt_ioctl(struct tty_struct *tty,
if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
perm = 1;

- kbd = kbd_table + console;
switch (cmd) {
case TIOCLINUX:
ret = tioclinux(tty, arg);
@@ -565,7 +338,8 @@ int vt_ioctl(struct tty_struct *tty,
* this is naive.
*/
ucval = KB_101;
- goto setchar;
+ ret = put_user(ucval, (char __user *)arg);
+ break;

/*
* These cannot be implemented on any machine that implements
@@ -670,68 +444,25 @@ int vt_ioctl(struct tty_struct *tty,
case KDSKBMODE:
if (!perm)
goto eperm;
- switch(arg) {
- case K_RAW:
- kbd->kbdmode = VC_RAW;
- break;
- case K_MEDIUMRAW:
- kbd->kbdmode = VC_MEDIUMRAW;
- break;
- case K_XLATE:
- kbd->kbdmode = VC_XLATE;
- compute_shiftstate();
- break;
- case K_UNICODE:
- kbd->kbdmode = VC_UNICODE;
- compute_shiftstate();
- break;
- case K_OFF:
- kbd->kbdmode = VC_OFF;
- break;
- default:
- ret = -EINVAL;
- goto out;
- }
- tty_ldisc_flush(tty);
+ ret = vt_do_kdskbmode(console, arg);
+ if (ret == 0)
+ tty_ldisc_flush(tty);
break;

case KDGKBMODE:
- switch (kbd->kbdmode) {
- case VC_RAW:
- uival = K_RAW;
- break;
- case VC_MEDIUMRAW:
- uival = K_MEDIUMRAW;
- break;
- case VC_UNICODE:
- uival = K_UNICODE;
- break;
- case VC_OFF:
- uival = K_OFF;
- break;
- default:
- uival = K_XLATE;
- break;
- }
- goto setint;
+ uival = vt_do_kdgkbmode(console);
+ ret = put_user(uival, (int __user *)arg);
+ break;

/* this could be folded into KDSKBMODE, but for compatibility
reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */
case KDSKBMETA:
- switch(arg) {
- case K_METABIT:
- clr_vc_kbd_mode(kbd, VC_META);
- break;
- case K_ESCPREFIX:
- set_vc_kbd_mode(kbd, VC_META);
- break;
- default:
- ret = -EINVAL;
- }
+ ret = vt_do_kdskbmeta(console, arg);
break;

case KDGKBMETA:
- uival = (vc_kbd_mode(kbd, VC_META) ? K_ESCPREFIX : K_METABIT);
+ /* FIXME: should review whether this is worth locking */
+ uival = vt_do_kdgkbmeta(console);
setint:
ret = put_user(uival, (int __user *)arg);
break;
@@ -740,17 +471,17 @@ int vt_ioctl(struct tty_struct *tty,
case KDSETKEYCODE:
if(!capable(CAP_SYS_TTY_CONFIG))
perm = 0;
- ret = do_kbkeycode_ioctl(cmd, up, perm);
+ ret = vt_do_kbkeycode_ioctl(cmd, up, perm);
break;

case KDGKBENT:
case KDSKBENT:
- ret = do_kdsk_ioctl(cmd, up, perm, kbd);
+ ret = vt_do_kdsk_ioctl(cmd, up, perm, console);
break;

case KDGKBSENT:
case KDSKBSENT:
- ret = do_kdgkb_ioctl(cmd, up, perm);
+ ret = vt_do_kdgkb_ioctl(cmd, up, perm);
break;

/* Diacritical processing. Handled in keyboard.c as it has
@@ -765,33 +496,10 @@ int vt_ioctl(struct tty_struct *tty,
/* the ioctls below read/set the flags usually shown in the leds */
/* don't use them - they will go away without warning */
case KDGKBLED:
- ucval = kbd->ledflagstate | (kbd->default_ledflagstate << 4);
- goto setchar;
-
case KDSKBLED:
- if (!perm)
- goto eperm;
- if (arg & ~0x77) {
- ret = -EINVAL;
- break;
- }
- kbd->ledflagstate = (arg & 7);
- kbd->default_ledflagstate = ((arg >> 4) & 7);
- set_leds();
- break;
-
- /* the ioctls below only set the lights, not the functions */
- /* for those, see KDGKBLED and KDSKBLED above */
case KDGETLED:
- ucval = getledstate();
- setchar:
- ret = put_user(ucval, (char __user *)arg);
- break;
-
case KDSETLED:
- if (!perm)
- goto eperm;
- setledstate(kbd, arg);
+ ret = vt_do_kdskled(console, cmd, arg, perm);
break;

/*
@@ -1286,7 +994,7 @@ eperm:
void reset_vc(struct vc_data *vc)
{
vc->vc_mode = KD_TEXT;
- kbd_table[vc->vc_num].kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE;
+ vt_reset_unicode(vc->vc_num);
vc->vt_mode.mode = VT_AUTO;
vc->vt_mode.waitv = 0;
vc->vt_mode.relsig = 0;
@@ -1309,6 +1017,7 @@ void vc_SAK(struct work_struct *work)
console_lock();
vc = vc_con->d;
if (vc) {
+ /* FIXME: review tty ref counting */
tty = vc->port.tty;
/*
* SAK should also work in all raw modes and reset
diff --git a/include/linux/kbd_kern.h b/include/linux/kbd_kern.h
index ec2d17b..daf4a3a 100644
--- a/include/linux/kbd_kern.h
+++ b/include/linux/kbd_kern.h
@@ -7,8 +7,6 @@

extern struct tasklet_struct keyboard_tasklet;

-extern int shift_state;
-
extern char *func_table[MAX_NR_FUNC];
extern char func_buf[];
extern char *funcbufptr;
@@ -65,8 +63,6 @@ struct kbd_struct {
#define VC_META 4 /* 0 - meta, 1 - meta=prefix with ESC */
};

-extern struct kbd_struct kbd_table[];
-
extern int kbd_init(void);

extern unsigned char getledstate(void);
@@ -79,6 +75,7 @@ extern void (*kbd_ledfunc)(unsigned int led);
extern int set_console(int nr);
extern void schedule_console_callback(void);

+/* FIXME: review locking for vt.c callers */
static inline void set_leds(void)
{
tasklet_schedule(&keyboard_tasklet);
@@ -142,8 +139,6 @@ static inline void chg_vc_kbd_led(struct kbd_struct * kbd, int flag)

struct console;

-int getkeycode(unsigned int scancode);
-int setkeycode(unsigned int scancode, unsigned int keycode);
void compute_shiftstate(void);

/* defkeymap.c */
diff --git a/include/linux/keyboard.h b/include/linux/keyboard.h
index 33a63f6..86e5214 100644
--- a/include/linux/keyboard.h
+++ b/include/linux/keyboard.h
@@ -24,8 +24,6 @@

#ifdef __KERNEL__
struct notifier_block;
-extern const int NR_TYPES;
-extern const int max_vals[];
extern unsigned short *key_maps[MAX_NR_KEYMAPS];
extern unsigned short plain_map[NR_KEYS];

diff --git a/include/linux/vt_kern.h b/include/linux/vt_kern.h
index 5d8726a..e33d77f 100644
--- a/include/linux/vt_kern.h
+++ b/include/linux/vt_kern.h
@@ -169,5 +169,28 @@ extern void hide_boot_cursor(bool hide);

/* keyboard provided interfaces */
extern int vt_do_diacrit(unsigned int cmd, void __user *up, int eperm);
+extern int vt_do_kdskbmode(int console, unsigned int arg);
+extern int vt_do_kdskbmeta(int console, unsigned int arg);
+extern int vt_do_kbkeycode_ioctl(int cmd, struct kbkeycode __user *user_kbkc,
+ int perm);
+extern int vt_do_kdsk_ioctl(int cmd, struct kbentry __user *user_kbe,
+ int perm, int console);
+extern int vt_do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb,
+ int perm);
+extern int vt_do_kdskled(int console, int cmd, unsigned long arg, int perm);
+extern int vt_do_kdgkbmode(int console);
+extern int vt_do_kdgkbmeta(int console);
+extern void vt_reset_unicode(int console);
+extern int vt_get_shift_state(void);
+extern void vt_reset_keyboard(int console);
+extern int vt_get_leds(int console, int flag);
+extern int vt_get_kbd_mode_bit(int console, int bit);
+extern void vt_set_kbd_mode_bit(int console, int bit);
+extern void vt_clr_kbd_mode_bit(int console, int bit);
+extern void vt_set_led_state(int console, int leds);
+extern void vt_set_led_state(int console, int leds);
+extern void vt_kbd_con_start(int console);
+extern void vt_kbd_con_stop(int console);
+

#endif /* _VT_KERN_H */


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