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Merge branch 'tty-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6

Browse Source 
* 'tty-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6:
  tty: update MAINTAINERS file due to driver movement
  tty: move drivers/serial/ to drivers/tty/serial/
  tty: move hvc drivers to drivers/tty/hvc/
This commit is contained in:
Linus Torvalds
2011-01-20 16:39:23 -08:00
parent 466c19063b df6212529c
commit fc887b15d9
140 changed files with 42 additions and 41 deletions
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2
drivers/char/Kconfig
View File

@@ -426,7 +426,7 @@ config SGI_MBCS
If you have an SGI Altix with an attached SABrick
say Y or M here, otherwise say N.
source "drivers/serial/Kconfig"
source "drivers/tty/serial/Kconfig"
config UNIX98_PTYS
bool "Unix98 PTY support" if EMBEDDED

13
drivers/char/Makefile
View File

@@ -30,25 +30,12 @@ obj-$(CONFIG_SYNCLINK_GT) += synclink_gt.o
obj-$(CONFIG_AMIGA_BUILTIN_SERIAL) += amiserial.o
obj-$(CONFIG_SX) += sx.o generic_serial.o
obj-$(CONFIG_RIO) += rio/ generic_serial.o
obj-$(CONFIG_HVC_CONSOLE) += hvc_vio.o hvsi.o
obj-$(CONFIG_HVC_ISERIES) += hvc_iseries.o
obj-$(CONFIG_HVC_RTAS) += hvc_rtas.o
obj-$(CONFIG_HVC_TILE) += hvc_tile.o
obj-$(CONFIG_HVC_DCC) += hvc_dcc.o
obj-$(CONFIG_HVC_BEAT) += hvc_beat.o
obj-$(CONFIG_HVC_DRIVER) += hvc_console.o
obj-$(CONFIG_HVC_IRQ) += hvc_irq.o
obj-$(CONFIG_HVC_XEN) += hvc_xen.o
obj-$(CONFIG_HVC_IUCV) += hvc_iucv.o
obj-$(CONFIG_HVC_UDBG) += hvc_udbg.o
obj-$(CONFIG_VIRTIO_CONSOLE) += virtio_console.o
obj-$(CONFIG_RAW_DRIVER) += raw.o
obj-$(CONFIG_SGI_SNSC) += snsc.o snsc_event.o
obj-$(CONFIG_MSPEC) += mspec.o
obj-$(CONFIG_MMTIMER) += mmtimer.o
obj-$(CONFIG_UV_MMTIMER) += uv_mmtimer.o
obj-$(CONFIG_VIOTAPE) += viotape.o
obj-$(CONFIG_HVCS) += hvcs.o
obj-$(CONFIG_IBM_BSR) += bsr.o
obj-$(CONFIG_SGI_MBCS) += mbcs.o
obj-$(CONFIG_BRIQ_PANEL) += briq_panel.o

134
drivers/char/hvc_beat.c
View File

@@ -1,134 +0,0 @@
/*
* Beat hypervisor console driver
*
* (C) Copyright 2006 TOSHIBA CORPORATION
*
* This code is based on drivers/char/hvc_rtas.c:
* (C) Copyright IBM Corporation 2001-2005
* (C) Copyright Red Hat, Inc. 2005
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/string.h>
#include <linux/console.h>
#include <asm/prom.h>
#include <asm/hvconsole.h>
#include <asm/firmware.h>
#include "hvc_console.h"
extern int64_t beat_get_term_char(uint64_t, uint64_t *, uint64_t *, uint64_t *);
extern int64_t beat_put_term_char(uint64_t, uint64_t, uint64_t, uint64_t);
struct hvc_struct *hvc_beat_dev = NULL;
/* bug: only one queue is available regardless of vtermno */
static int hvc_beat_get_chars(uint32_t vtermno, char *buf, int cnt)
{
static unsigned char q[sizeof(unsigned long) * 2]
__attribute__((aligned(sizeof(unsigned long))));
static int qlen = 0;
u64 got;
again:
if (qlen) {
if (qlen > cnt) {
memcpy(buf, q, cnt);
qlen -= cnt;
memmove(q + cnt, q, qlen);
return cnt;
} else { /* qlen <= cnt */
int r;
memcpy(buf, q, qlen);
r = qlen;
qlen = 0;
return r;
}
}
if (beat_get_term_char(vtermno, &got,
((u64 *)q), ((u64 *)q) + 1) == 0) {
qlen = got;
goto again;
}
return 0;
}
static int hvc_beat_put_chars(uint32_t vtermno, const char *buf, int cnt)
{
unsigned long kb[2];
int rest, nlen;
for (rest = cnt; rest > 0; rest -= nlen) {
nlen = (rest > 16) ? 16 : rest;
memcpy(kb, buf, nlen);
beat_put_term_char(vtermno, nlen, kb[0], kb[1]);
buf += nlen;
}
return cnt;
}
static const struct hv_ops hvc_beat_get_put_ops = {
.get_chars = hvc_beat_get_chars,
.put_chars = hvc_beat_put_chars,
};
static int hvc_beat_useit = 1;
static int hvc_beat_config(char *p)
{
hvc_beat_useit = simple_strtoul(p, NULL, 0);
return 0;
}
static int __init hvc_beat_console_init(void)
{
if (hvc_beat_useit && of_machine_is_compatible("Beat")) {
hvc_instantiate(0, 0, &hvc_beat_get_put_ops);
}
return 0;
}
/* temp */
static int __init hvc_beat_init(void)
{
struct hvc_struct *hp;
if (!firmware_has_feature(FW_FEATURE_BEAT))
return -ENODEV;
hp = hvc_alloc(0, NO_IRQ, &hvc_beat_get_put_ops, 16);
if (IS_ERR(hp))
return PTR_ERR(hp);
hvc_beat_dev = hp;
return 0;
}
static void __exit hvc_beat_exit(void)
{
if (hvc_beat_dev)
hvc_remove(hvc_beat_dev);
}
module_init(hvc_beat_init);
module_exit(hvc_beat_exit);
__setup("hvc_beat=", hvc_beat_config);
console_initcall(hvc_beat_console_init);

914
drivers/char/hvc_console.c
View File

@@ -1,914 +0,0 @@
/*
* Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
* Copyright (C) 2001 Paul Mackerras <paulus@au.ibm.com>, IBM
* Copyright (C) 2004 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
* Copyright (C) 2004 IBM Corporation
*
* Additional Author(s):
* Ryan S. Arnold <rsa@us.ibm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/console.h>
#include <linux/cpumask.h>
#include <linux/init.h>
#include <linux/kbd_kern.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/major.h>
#include <linux/sysrq.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/freezer.h>
#include <linux/slab.h>
#include <asm/uaccess.h>
#include "hvc_console.h"
#define HVC_MAJOR 229
#define HVC_MINOR 0
/*
* Wait this long per iteration while trying to push buffered data to the
* hypervisor before allowing the tty to complete a close operation.
*/
#define HVC_CLOSE_WAIT (HZ/100) /* 1/10 of a second */
/*
* These sizes are most efficient for vio, because they are the
* native transfer size. We could make them selectable in the
* future to better deal with backends that want other buffer sizes.
*/
#define N_OUTBUF 16
#define N_INBUF 16
#define __ALIGNED__ __attribute__((__aligned__(sizeof(long))))
static struct tty_driver *hvc_driver;
static struct task_struct *hvc_task;
/* Picks up late kicks after list walk but before schedule() */
static int hvc_kicked;
static int hvc_init(void);
#ifdef CONFIG_MAGIC_SYSRQ
static int sysrq_pressed;
#endif
/* dynamic list of hvc_struct instances */
static LIST_HEAD(hvc_structs);
/*
* Protect the list of hvc_struct instances from inserts and removals during
* list traversal.
*/
static DEFINE_SPINLOCK(hvc_structs_lock);
/*
* This value is used to assign a tty->index value to a hvc_struct based
* upon order of exposure via hvc_probe(), when we can not match it to
* a console candidate registered with hvc_instantiate().
*/
static int last_hvc = -1;
/*
* Do not call this function with either the hvc_structs_lock or the hvc_struct
* lock held. If successful, this function increments the kref reference
* count against the target hvc_struct so it should be released when finished.
*/
static struct hvc_struct *hvc_get_by_index(int index)
{
struct hvc_struct *hp;
unsigned long flags;
spin_lock(&hvc_structs_lock);
list_for_each_entry(hp, &hvc_structs, next) {
spin_lock_irqsave(&hp->lock, flags);
if (hp->index == index) {
kref_get(&hp->kref);
spin_unlock_irqrestore(&hp->lock, flags);
spin_unlock(&hvc_structs_lock);
return hp;
}
spin_unlock_irqrestore(&hp->lock, flags);
}
hp = NULL;
spin_unlock(&hvc_structs_lock);
return hp;
}
/*
* Initial console vtermnos for console API usage prior to full console
* initialization. Any vty adapter outside this range will not have usable
* console interfaces but can still be used as a tty device. This has to be
* static because kmalloc will not work during early console init.
*/
static const struct hv_ops *cons_ops[MAX_NR_HVC_CONSOLES];
static uint32_t vtermnos[MAX_NR_HVC_CONSOLES] =
{[0 ... MAX_NR_HVC_CONSOLES - 1] = -1};
/*
* Console APIs, NOT TTY. These APIs are available immediately when
* hvc_console_setup() finds adapters.
*/
static void hvc_console_print(struct console *co, const char *b,
unsigned count)
{
char c[N_OUTBUF] __ALIGNED__;
unsigned i = 0, n = 0;
int r, donecr = 0, index = co->index;
/* Console access attempt outside of acceptable console range. */
if (index >= MAX_NR_HVC_CONSOLES)
return;
/* This console adapter was removed so it is not usable. */
if (vtermnos[index] == -1)
return;
while (count > 0 || i > 0) {
if (count > 0 && i < sizeof(c)) {
if (b[n] == '\n' && !donecr) {
c[i++] = '\r';
donecr = 1;
} else {
c[i++] = b[n++];
donecr = 0;
--count;
}
} else {
r = cons_ops[index]->put_chars(vtermnos[index], c, i);
if (r <= 0) {
/* throw away chars on error */
i = 0;
} else if (r > 0) {
i -= r;
if (i > 0)
memmove(c, c+r, i);
}
}
}
}
static struct tty_driver *hvc_console_device(struct console *c, int *index)
{
if (vtermnos[c->index] == -1)
return NULL;
*index = c->index;
return hvc_driver;
}
static int __init hvc_console_setup(struct console *co, char *options)
{
if (co->index < 0 || co->index >= MAX_NR_HVC_CONSOLES)
return -ENODEV;
if (vtermnos[co->index] == -1)
return -ENODEV;
return 0;
}
static struct console hvc_console = {
.name = "hvc",
.write = hvc_console_print,
.device = hvc_console_device,
.setup = hvc_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
};
/*
* Early console initialization. Precedes driver initialization.
*
* (1) we are first, and the user specified another driver
* -- index will remain -1
* (2) we are first and the user specified no driver
* -- index will be set to 0, then we will fail setup.
* (3) we are first and the user specified our driver
* -- index will be set to user specified driver, and we will fail
* (4) we are after driver, and this initcall will register us
* -- if the user didn't specify a driver then the console will match
*
* Note that for cases 2 and 3, we will match later when the io driver
* calls hvc_instantiate() and call register again.
*/
static int __init hvc_console_init(void)
{
register_console(&hvc_console);
return 0;
}
console_initcall(hvc_console_init);
/* callback when the kboject ref count reaches zero. */
static void destroy_hvc_struct(struct kref *kref)
{
struct hvc_struct *hp = container_of(kref, struct hvc_struct, kref);
unsigned long flags;
spin_lock(&hvc_structs_lock);
spin_lock_irqsave(&hp->lock, flags);
list_del(&(hp->next));
spin_unlock_irqrestore(&hp->lock, flags);
spin_unlock(&hvc_structs_lock);
kfree(hp);
}
/*
* hvc_instantiate() is an early console discovery method which locates
* consoles * prior to the vio subsystem discovering them. Hotplugged
* vty adapters do NOT get an hvc_instantiate() callback since they
* appear after early console init.
*/
int hvc_instantiate(uint32_t vtermno, int index, const struct hv_ops *ops)
{
struct hvc_struct *hp;
if (index < 0 || index >= MAX_NR_HVC_CONSOLES)
return -1;
if (vtermnos[index] != -1)
return -1;
/* make sure no no tty has been registered in this index */
hp = hvc_get_by_index(index);
if (hp) {
kref_put(&hp->kref, destroy_hvc_struct);
return -1;
}
vtermnos[index] = vtermno;
cons_ops[index] = ops;
/* reserve all indices up to and including this index */
if (last_hvc < index)
last_hvc = index;
/* if this index is what the user requested, then register
* now (setup won't fail at this point). It's ok to just
* call register again if previously .setup failed.
*/
if (index == hvc_console.index)
register_console(&hvc_console);
return 0;
}
EXPORT_SYMBOL_GPL(hvc_instantiate);
/* Wake the sleeping khvcd */
void hvc_kick(void)
{
hvc_kicked = 1;
wake_up_process(hvc_task);
}
EXPORT_SYMBOL_GPL(hvc_kick);
static void hvc_unthrottle(struct tty_struct *tty)
{
hvc_kick();
}
/*
* The TTY interface won't be used until after the vio layer has exposed the vty
* adapter to the kernel.
*/
static int hvc_open(struct tty_struct *tty, struct file * filp)
{
struct hvc_struct *hp;
unsigned long flags;
int rc = 0;
/* Auto increments kref reference if found. */
if (!(hp = hvc_get_by_index(tty->index)))
return -ENODEV;
spin_lock_irqsave(&hp->lock, flags);
/* Check and then increment for fast path open. */
if (hp->count++ > 0) {
tty_kref_get(tty);
spin_unlock_irqrestore(&hp->lock, flags);
hvc_kick();
return 0;
} /* else count == 0 */
tty->driver_data = hp;
hp->tty = tty_kref_get(tty);
spin_unlock_irqrestore(&hp->lock, flags);
if (hp->ops->notifier_add)
rc = hp->ops->notifier_add(hp, hp->data);
/*
* If the notifier fails we return an error. The tty layer
* will call hvc_close() after a failed open but we don't want to clean
* up there so we'll clean up here and clear out the previously set
* tty fields and return the kref reference.
*/
if (rc) {
spin_lock_irqsave(&hp->lock, flags);
hp->tty = NULL;
spin_unlock_irqrestore(&hp->lock, flags);
tty_kref_put(tty);
tty->driver_data = NULL;
kref_put(&hp->kref, destroy_hvc_struct);
printk(KERN_ERR "hvc_open: request_irq failed with rc %d.\n", rc);
}
/* Force wakeup of the polling thread */
hvc_kick();
return rc;
}
static void hvc_close(struct tty_struct *tty, struct file * filp)
{
struct hvc_struct *hp;
unsigned long flags;
if (tty_hung_up_p(filp))
return;
/*
* No driver_data means that this close was issued after a failed
* hvc_open by the tty layer's release_dev() function and we can just
* exit cleanly because the kref reference wasn't made.
*/
if (!tty->driver_data)
return;
hp = tty->driver_data;
spin_lock_irqsave(&hp->lock, flags);
if (--hp->count == 0) {
/* We are done with the tty pointer now. */
hp->tty = NULL;
spin_unlock_irqrestore(&hp->lock, flags);
if (hp->ops->notifier_del)
hp->ops->notifier_del(hp, hp->data);
/* cancel pending tty resize work */
cancel_work_sync(&hp->tty_resize);
/*
* Chain calls chars_in_buffer() and returns immediately if
* there is no buffered data otherwise sleeps on a wait queue
* waking periodically to check chars_in_buffer().
*/
tty_wait_until_sent(tty, HVC_CLOSE_WAIT);
} else {
if (hp->count < 0)
printk(KERN_ERR "hvc_close %X: oops, count is %d\n",
hp->vtermno, hp->count);
spin_unlock_irqrestore(&hp->lock, flags);
}
tty_kref_put(tty);
kref_put(&hp->kref, destroy_hvc_struct);
}
static void hvc_hangup(struct tty_struct *tty)
{
struct hvc_struct *hp = tty->driver_data;
unsigned long flags;
int temp_open_count;
if (!hp)
return;
/* cancel pending tty resize work */
cancel_work_sync(&hp->tty_resize);
spin_lock_irqsave(&hp->lock, flags);
/*
* The N_TTY line discipline has problems such that in a close vs
* open->hangup case this can be called after the final close so prevent
* that from happening for now.
*/
if (hp->count <= 0) {
spin_unlock_irqrestore(&hp->lock, flags);
return;
}
temp_open_count = hp->count;
hp->count = 0;
hp->n_outbuf = 0;
hp->tty = NULL;
spin_unlock_irqrestore(&hp->lock, flags);
if (hp->ops->notifier_hangup)
hp->ops->notifier_hangup(hp, hp->data);
while(temp_open_count) {
--temp_open_count;
tty_kref_put(tty);
kref_put(&hp->kref, destroy_hvc_struct);
}
}
/*
* Push buffered characters whether they were just recently buffered or waiting
* on a blocked hypervisor. Call this function with hp->lock held.
*/
static int hvc_push(struct hvc_struct *hp)
{
int n;
n = hp->ops->put_chars(hp->vtermno, hp->outbuf, hp->n_outbuf);
if (n <= 0) {
if (n == 0) {
hp->do_wakeup = 1;
return 0;
}
/* throw away output on error; this happens when
there is no session connected to the vterm. */
hp->n_outbuf = 0;
} else
hp->n_outbuf -= n;
if (hp->n_outbuf > 0)
memmove(hp->outbuf, hp->outbuf + n, hp->n_outbuf);
else
hp->do_wakeup = 1;
return n;
}
static int hvc_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
struct hvc_struct *hp = tty->driver_data;
unsigned long flags;
int rsize, written = 0;
/* This write was probably executed during a tty close. */
if (!hp)
return -EPIPE;
if (hp->count <= 0)
return -EIO;
spin_lock_irqsave(&hp->lock, flags);
/* Push pending writes */
if (hp->n_outbuf > 0)
hvc_push(hp);
while (count > 0 && (rsize = hp->outbuf_size - hp->n_outbuf) > 0) {
if (rsize > count)
rsize = count;
memcpy(hp->outbuf + hp->n_outbuf, buf, rsize);
count -= rsize;
buf += rsize;
hp->n_outbuf += rsize;
written += rsize;
hvc_push(hp);
}
spin_unlock_irqrestore(&hp->lock, flags);
/*
* Racy, but harmless, kick thread if there is still pending data.
*/
if (hp->n_outbuf)
hvc_kick();
return written;
}
/**
* hvc_set_winsz() - Resize the hvc tty terminal window.
* @work: work structure.
*
* The routine shall not be called within an atomic context because it
* might sleep.
*
* Locking: hp->lock
*/
static void hvc_set_winsz(struct work_struct *work)
{
struct hvc_struct *hp;
unsigned long hvc_flags;
struct tty_struct *tty;
struct winsize ws;
hp = container_of(work, struct hvc_struct, tty_resize);
spin_lock_irqsave(&hp->lock, hvc_flags);
if (!hp->tty) {
spin_unlock_irqrestore(&hp->lock, hvc_flags);
return;
}
ws = hp->ws;
tty = tty_kref_get(hp->tty);
spin_unlock_irqrestore(&hp->lock, hvc_flags);
tty_do_resize(tty, &ws);
tty_kref_put(tty);
}
/*
* This is actually a contract between the driver and the tty layer outlining
* how much write room the driver can guarantee will be sent OR BUFFERED. This
* driver MUST honor the return value.
*/
static int hvc_write_room(struct tty_struct *tty)
{
struct hvc_struct *hp = tty->driver_data;
if (!hp)
return -1;
return hp->outbuf_size - hp->n_outbuf;
}
static int hvc_chars_in_buffer(struct tty_struct *tty)
{
struct hvc_struct *hp = tty->driver_data;
if (!hp)
return 0;
return hp->n_outbuf;
}
/*
* timeout will vary between the MIN and MAX values defined here. By default
* and during console activity we will use a default MIN_TIMEOUT of 10. When
* the console is idle, we increase the timeout value on each pass through
* msleep until we reach the max. This may be noticeable as a brief (average
* one second) delay on the console before the console responds to input when
* there has been no input for some time.
*/
#define MIN_TIMEOUT (10)
#define MAX_TIMEOUT (2000)
static u32 timeout = MIN_TIMEOUT;
#define HVC_POLL_READ 0x00000001
#define HVC_POLL_WRITE 0x00000002
int hvc_poll(struct hvc_struct *hp)
{
struct tty_struct *tty;
int i, n, poll_mask = 0;
char buf[N_INBUF] __ALIGNED__;
unsigned long flags;
int read_total = 0;
int written_total = 0;
spin_lock_irqsave(&hp->lock, flags);
/* Push pending writes */
if (hp->n_outbuf > 0)
written_total = hvc_push(hp);
/* Reschedule us if still some write pending */
if (hp->n_outbuf > 0) {
poll_mask |= HVC_POLL_WRITE;
/* If hvc_push() was not able to write, sleep a few msecs */
timeout = (written_total) ? 0 : MIN_TIMEOUT;
}
/* No tty attached, just skip */
tty = tty_kref_get(hp->tty);
if (tty == NULL)
goto bail;
/* Now check if we can get data (are we throttled ?) */
if (test_bit(TTY_THROTTLED, &tty->flags))
goto throttled;
/* If we aren't notifier driven and aren't throttled, we always
* request a reschedule
*/
if (!hp->irq_requested)
poll_mask |= HVC_POLL_READ;
/* Read data if any */
for (;;) {
int count = tty_buffer_request_room(tty, N_INBUF);
/* If flip is full, just reschedule a later read */
if (count == 0) {
poll_mask |= HVC_POLL_READ;
break;
}
n = hp->ops->get_chars(hp->vtermno, buf, count);
if (n <= 0) {
/* Hangup the tty when disconnected from host */
if (n == -EPIPE) {
spin_unlock_irqrestore(&hp->lock, flags);
tty_hangup(tty);
spin_lock_irqsave(&hp->lock, flags);
} else if ( n == -EAGAIN ) {
/*
* Some back-ends can only ensure a certain min
* num of bytes read, which may be > 'count'.
* Let the tty clear the flip buff to make room.
*/
poll_mask |= HVC_POLL_READ;
}
break;
}
for (i = 0; i < n; ++i) {
#ifdef CONFIG_MAGIC_SYSRQ
if (hp->index == hvc_console.index) {
/* Handle the SysRq Hack */
/* XXX should support a sequence */
if (buf[i] == '\x0f') { /* ^O */
/* if ^O is pressed again, reset
* sysrq_pressed and flip ^O char */
sysrq_pressed = !sysrq_pressed;
if (sysrq_pressed)
continue;
} else if (sysrq_pressed) {
handle_sysrq(buf[i]);
sysrq_pressed = 0;
continue;
}
}
#endif /* CONFIG_MAGIC_SYSRQ */
tty_insert_flip_char(tty, buf[i], 0);
}
read_total += n;
}
throttled:
/* Wakeup write queue if necessary */
if (hp->do_wakeup) {
hp->do_wakeup = 0;
tty_wakeup(tty);
}
bail:
spin_unlock_irqrestore(&hp->lock, flags);
if (read_total) {
/* Activity is occurring, so reset the polling backoff value to
a minimum for performance. */
timeout = MIN_TIMEOUT;
tty_flip_buffer_push(tty);
}
if (tty)
tty_kref_put(tty);
return poll_mask;
}
EXPORT_SYMBOL_GPL(hvc_poll);
/**
* __hvc_resize() - Update terminal window size information.
* @hp: HVC console pointer
* @ws: Terminal window size structure
*
* Stores the specified window size information in the hvc structure of @hp.
* The function schedule the tty resize update.
*
* Locking: Locking free; the function MUST be called holding hp->lock
*/
void __hvc_resize(struct hvc_struct *hp, struct winsize ws)
{
hp->ws = ws;
schedule_work(&hp->tty_resize);
}
EXPORT_SYMBOL_GPL(__hvc_resize);
/*
* This kthread is either polling or interrupt driven. This is determined by
* calling hvc_poll() who determines whether a console adapter support
* interrupts.
*/
static int khvcd(void *unused)
{
int poll_mask;
struct hvc_struct *hp;
set_freezable();
do {
poll_mask = 0;
hvc_kicked = 0;
try_to_freeze();
wmb();
if (!cpus_are_in_xmon()) {
spin_lock(&hvc_structs_lock);
list_for_each_entry(hp, &hvc_structs, next) {
poll_mask |= hvc_poll(hp);
}
spin_unlock(&hvc_structs_lock);
} else
poll_mask |= HVC_POLL_READ;
if (hvc_kicked)
continue;
set_current_state(TASK_INTERRUPTIBLE);
if (!hvc_kicked) {
if (poll_mask == 0)
schedule();
else {
if (timeout < MAX_TIMEOUT)
timeout += (timeout >> 6) + 1;
msleep_interruptible(timeout);
}
}
__set_current_state(TASK_RUNNING);
} while (!kthread_should_stop());
return 0;
}
static const struct tty_operations hvc_ops = {
.open = hvc_open,
.close = hvc_close,
.write = hvc_write,
.hangup = hvc_hangup,
.unthrottle = hvc_unthrottle,
.write_room = hvc_write_room,
.chars_in_buffer = hvc_chars_in_buffer,
};
struct hvc_struct *hvc_alloc(uint32_t vtermno, int data,
const struct hv_ops *ops,
int outbuf_size)
{
struct hvc_struct *hp;
int i;
/* We wait until a driver actually comes along */
if (!hvc_driver) {
int err = hvc_init();
if (err)
return ERR_PTR(err);
}
hp = kzalloc(ALIGN(sizeof(*hp), sizeof(long)) + outbuf_size,
GFP_KERNEL);
if (!hp)
return ERR_PTR(-ENOMEM);
hp->vtermno = vtermno;
hp->data = data;
hp->ops = ops;
hp->outbuf_size = outbuf_size;
hp->outbuf = &((char *)hp)[ALIGN(sizeof(*hp), sizeof(long))];
kref_init(&hp->kref);
INIT_WORK(&hp->tty_resize, hvc_set_winsz);
spin_lock_init(&hp->lock);
spin_lock(&hvc_structs_lock);
/*
* find index to use:
* see if this vterm id matches one registered for console.
*/
for (i=0; i < MAX_NR_HVC_CONSOLES; i++)
if (vtermnos[i] == hp->vtermno &&
cons_ops[i] == hp->ops)
break;
/* no matching slot, just use a counter */
if (i >= MAX_NR_HVC_CONSOLES)
i = ++last_hvc;
hp->index = i;
list_add_tail(&(hp->next), &hvc_structs);
spin_unlock(&hvc_structs_lock);
return hp;
}
EXPORT_SYMBOL_GPL(hvc_alloc);
int hvc_remove(struct hvc_struct *hp)
{
unsigned long flags;
struct tty_struct *tty;
spin_lock_irqsave(&hp->lock, flags);
tty = tty_kref_get(hp->tty);
if (hp->index < MAX_NR_HVC_CONSOLES)
vtermnos[hp->index] = -1;
/* Don't whack hp->irq because tty_hangup() will need to free the irq. */
spin_unlock_irqrestore(&hp->lock, flags);
/*
* We 'put' the instance that was grabbed when the kref instance
* was initialized using kref_init(). Let the last holder of this
* kref cause it to be removed, which will probably be the tty_vhangup
* below.
*/
kref_put(&hp->kref, destroy_hvc_struct);
/*
* This function call will auto chain call hvc_hangup.
*/
if (tty) {
tty_vhangup(tty);
tty_kref_put(tty);
}
return 0;
}
EXPORT_SYMBOL_GPL(hvc_remove);
/* Driver initialization: called as soon as someone uses hvc_alloc(). */
static int hvc_init(void)
{
struct tty_driver *drv;
int err;
/* We need more than hvc_count adapters due to hotplug additions. */
drv = alloc_tty_driver(HVC_ALLOC_TTY_ADAPTERS);
if (!drv) {
err = -ENOMEM;
goto out;
}
drv->owner = THIS_MODULE;
drv->driver_name = "hvc";
drv->name = "hvc";
drv->major = HVC_MAJOR;
drv->minor_start = HVC_MINOR;
drv->type = TTY_DRIVER_TYPE_SYSTEM;
drv->init_termios = tty_std_termios;
drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
tty_set_operations(drv, &hvc_ops);
/* Always start the kthread because there can be hotplug vty adapters
* added later. */
hvc_task = kthread_run(khvcd, NULL, "khvcd");
if (IS_ERR(hvc_task)) {
printk(KERN_ERR "Couldn't create kthread for console.\n");
err = PTR_ERR(hvc_task);
goto put_tty;
}
err = tty_register_driver(drv);
if (err) {
printk(KERN_ERR "Couldn't register hvc console driver\n");
goto stop_thread;
}
/*
* Make sure tty is fully registered before allowing it to be
* found by hvc_console_device.
*/
smp_mb();
hvc_driver = drv;
return 0;
stop_thread:
kthread_stop(hvc_task);
hvc_task = NULL;
put_tty:
put_tty_driver(drv);
out:
return err;
}
/* This isn't particularly necessary due to this being a console driver
* but it is nice to be thorough.
*/
static void __exit hvc_exit(void)
{
if (hvc_driver) {
kthread_stop(hvc_task);
tty_unregister_driver(hvc_driver);
/* return tty_struct instances allocated in hvc_init(). */
put_tty_driver(hvc_driver);
unregister_console(&hvc_console);
}
}
module_exit(hvc_exit);

119
drivers/char/hvc_console.h
View File

@@ -1,119 +0,0 @@
/*
* hvc_console.h
* Copyright (C) 2005 IBM Corporation
*
* Author(s):
* Ryan S. Arnold <rsa@us.ibm.com>
*
* hvc_console header information:
* moved here from arch/powerpc/include/asm/hvconsole.h
* and drivers/char/hvc_console.c
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef HVC_CONSOLE_H
#define HVC_CONSOLE_H
#include <linux/kref.h>
#include <linux/tty.h>
#include <linux/spinlock.h>
/*
* This is the max number of console adapters that can/will be found as
* console devices on first stage console init. Any number beyond this range
* can't be used as a console device but is still a valid tty device.
*/
#define MAX_NR_HVC_CONSOLES 16
/*
* The Linux TTY code does not support dynamic addition of tty derived devices
* so we need to know how many tty devices we might need when space is allocated
* for the tty device. Since this driver supports hotplug of vty adapters we
* need to make sure we have enough allocated.
*/
#define HVC_ALLOC_TTY_ADAPTERS 8
struct hvc_struct {
spinlock_t lock;
int index;
struct tty_struct *tty;
int count;
int do_wakeup;
char *outbuf;
int outbuf_size;
int n_outbuf;
uint32_t vtermno;
const struct hv_ops *ops;
int irq_requested;
int data;
struct winsize ws;
struct work_struct tty_resize;
struct list_head next;
struct kref kref; /* ref count & hvc_struct lifetime */
};
/* implemented by a low level driver */
struct hv_ops {
int (*get_chars)(uint32_t vtermno, char *buf, int count);
int (*put_chars)(uint32_t vtermno, const char *buf, int count);
/* Callbacks for notification. Called in open, close and hangup */
int (*notifier_add)(struct hvc_struct *hp, int irq);
void (*notifier_del)(struct hvc_struct *hp, int irq);
void (*notifier_hangup)(struct hvc_struct *hp, int irq);
};
/* Register a vterm and a slot index for use as a console (console_init) */
extern int hvc_instantiate(uint32_t vtermno, int index,
const struct hv_ops *ops);
/* register a vterm for hvc tty operation (module_init or hotplug add) */
extern struct hvc_struct * hvc_alloc(uint32_t vtermno, int data,
const struct hv_ops *ops, int outbuf_size);
/* remove a vterm from hvc tty operation (module_exit or hotplug remove) */
extern int hvc_remove(struct hvc_struct *hp);
/* data available */
int hvc_poll(struct hvc_struct *hp);
void hvc_kick(void);
/* Resize hvc tty terminal window */
extern void __hvc_resize(struct hvc_struct *hp, struct winsize ws);
static inline void hvc_resize(struct hvc_struct *hp, struct winsize ws)
{
unsigned long flags;
spin_lock_irqsave(&hp->lock, flags);
__hvc_resize(hp, ws);
spin_unlock_irqrestore(&hp->lock, flags);
}
/* default notifier for irq based notification */
extern int notifier_add_irq(struct hvc_struct *hp, int data);
extern void notifier_del_irq(struct hvc_struct *hp, int data);
extern void notifier_hangup_irq(struct hvc_struct *hp, int data);
#if defined(CONFIG_XMON) && defined(CONFIG_SMP)
#include <asm/xmon.h>
#else
static inline int cpus_are_in_xmon(void)
{
return 0;
}
#endif
#endif // HVC_CONSOLE_H

133
drivers/char/hvc_dcc.c
View File

@@ -1,133 +0,0 @@
/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <asm/processor.h>
#include "hvc_console.h"
/* DCC Status Bits */
#define DCC_STATUS_RX (1 << 30)
#define DCC_STATUS_TX (1 << 29)
static inline u32 __dcc_getstatus(void)
{
u32 __ret;
asm("mrc p14, 0, %0, c0, c1, 0 @ read comms ctrl reg"
: "=r" (__ret) : : "cc");
return __ret;
}
#if defined(CONFIG_CPU_V7)
static inline char __dcc_getchar(void)
{
char __c;
asm("get_wait: mrc p14, 0, pc, c0, c1, 0 \n\
bne get_wait \n\
mrc p14, 0, %0, c0, c5, 0 @ read comms data reg"
: "=r" (__c) : : "cc");
return __c;
}
#else
static inline char __dcc_getchar(void)
{
char __c;
asm("mrc p14, 0, %0, c0, c5, 0 @ read comms data reg"
: "=r" (__c));
return __c;
}
#endif
#if defined(CONFIG_CPU_V7)
static inline void __dcc_putchar(char c)
{
asm("put_wait: mrc p14, 0, pc, c0, c1, 0 \n\
bcs put_wait \n\
mcr p14, 0, %0, c0, c5, 0 "
: : "r" (c) : "cc");
}
#else
static inline void __dcc_putchar(char c)
{
asm("mcr p14, 0, %0, c0, c5, 0 @ write a char"
: /* no output register */
: "r" (c));
}
#endif
static int hvc_dcc_put_chars(uint32_t vt, const char *buf, int count)
{
int i;
for (i = 0; i < count; i++) {
while (__dcc_getstatus() & DCC_STATUS_TX)
cpu_relax();
__dcc_putchar((char)(buf[i] & 0xFF));
}
return count;
}
static int hvc_dcc_get_chars(uint32_t vt, char *buf, int count)
{
int i;
for (i = 0; i < count; ++i) {
int c = -1;
if (__dcc_getstatus() & DCC_STATUS_RX)
c = __dcc_getchar();
if (c < 0)
break;
buf[i] = c;
}
return i;
}
static const struct hv_ops hvc_dcc_get_put_ops = {
.get_chars = hvc_dcc_get_chars,
.put_chars = hvc_dcc_put_chars,
};
static int __init hvc_dcc_console_init(void)
{
hvc_instantiate(0, 0, &hvc_dcc_get_put_ops);
return 0;
}
console_initcall(hvc_dcc_console_init);
static int __init hvc_dcc_init(void)
{
hvc_alloc(0, 0, &hvc_dcc_get_put_ops, 128);
return 0;
}
device_initcall(hvc_dcc_init);

49
drivers/char/hvc_irq.c
View File

@@ -1,49 +0,0 @@
/*
* Copyright IBM Corp. 2001,2008
*
* This file contains the IRQ specific code for hvc_console
*
*/
#include <linux/interrupt.h>
#include "hvc_console.h"
static irqreturn_t hvc_handle_interrupt(int irq, void *dev_instance)
{
/* if hvc_poll request a repoll, then kick the hvcd thread */
if (hvc_poll(dev_instance))
hvc_kick();
return IRQ_HANDLED;
}
/*
* For IRQ based systems these callbacks can be used
*/
int notifier_add_irq(struct hvc_struct *hp, int irq)
{
int rc;
if (!irq) {
hp->irq_requested = 0;
return 0;
}
rc = request_irq(irq, hvc_handle_interrupt, IRQF_DISABLED,
"hvc_console", hp);
if (!rc)
hp->irq_requested = 1;
return rc;
}
void notifier_del_irq(struct hvc_struct *hp, int irq)
{
if (!hp->irq_requested)
return;
free_irq(irq, hp);
hp->irq_requested = 0;
}
void notifier_hangup_irq(struct hvc_struct *hp, int irq)
{
notifier_del_irq(hp, irq);
}

598
drivers/char/hvc_iseries.c
View File

@@ -1,598 +0,0 @@
/*
* iSeries vio driver interface to hvc_console.c
*
* This code is based heavily on hvc_vio.c and viocons.c
*
* Copyright (C) 2006 Stephen Rothwell, IBM Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdarg.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/console.h>
#include <asm/hvconsole.h>
#include <asm/vio.h>
#include <asm/prom.h>
#include <asm/firmware.h>
#include <asm/iseries/vio.h>
#include <asm/iseries/hv_call.h>
#include <asm/iseries/hv_lp_config.h>
#include <asm/iseries/hv_lp_event.h>
#include "hvc_console.h"
#define VTTY_PORTS 10
static DEFINE_SPINLOCK(consolelock);
static DEFINE_SPINLOCK(consoleloglock);
static const char hvc_driver_name[] = "hvc_console";
#define IN_BUF_SIZE 200
/*
* Our port information.
*/
static struct port_info {
HvLpIndex lp;
u64 seq; /* sequence number of last HV send */
u64 ack; /* last ack from HV */
struct hvc_struct *hp;
int in_start;
int in_end;
unsigned char in_buf[IN_BUF_SIZE];
} port_info[VTTY_PORTS] = {
[ 0 ... VTTY_PORTS - 1 ] = {
.lp = HvLpIndexInvalid
}
};
#define viochar_is_console(pi) ((pi) == &port_info[0])
static struct vio_device_id hvc_driver_table[] __devinitdata = {
{"serial", "IBM,iSeries-vty"},
{ "", "" }
};
MODULE_DEVICE_TABLE(vio, hvc_driver_table);
static void hvlog(char *fmt, ...)
{
int i;
unsigned long flags;
va_list args;
static char buf[256];
spin_lock_irqsave(&consoleloglock, flags);
va_start(args, fmt);
i = vscnprintf(buf, sizeof(buf) - 1, fmt, args);
va_end(args);
buf[i++] = '\r';
HvCall_writeLogBuffer(buf, i);
spin_unlock_irqrestore(&consoleloglock, flags);
}
/*
* Initialize the common fields in a charLpEvent
*/
static void init_data_event(struct viocharlpevent *viochar, HvLpIndex lp)
{
struct HvLpEvent *hev = &viochar->event;
memset(viochar, 0, sizeof(struct viocharlpevent));
hev->flags = HV_LP_EVENT_VALID | HV_LP_EVENT_DEFERRED_ACK |
HV_LP_EVENT_INT;
hev->xType = HvLpEvent_Type_VirtualIo;
hev->xSubtype = viomajorsubtype_chario | viochardata;
hev->xSourceLp = HvLpConfig_getLpIndex();
hev->xTargetLp = lp;
hev->xSizeMinus1 = sizeof(struct viocharlpevent);
hev->xSourceInstanceId = viopath_sourceinst(lp);
hev->xTargetInstanceId = viopath_targetinst(lp);
}
static int get_chars(uint32_t vtermno, char *buf, int count)
{
struct port_info *pi;
int n = 0;
unsigned long flags;
if (vtermno >= VTTY_PORTS)
return -EINVAL;
if (count == 0)
return 0;
pi = &port_info[vtermno];
spin_lock_irqsave(&consolelock, flags);
if (pi->in_end == 0)
goto done;
n = pi->in_end - pi->in_start;
if (n > count)
n = count;
memcpy(buf, &pi->in_buf[pi->in_start], n);
pi->in_start += n;
if (pi->in_start == pi->in_end) {
pi->in_start = 0;
pi->in_end = 0;
}
done:
spin_unlock_irqrestore(&consolelock, flags);
return n;
}
static int put_chars(uint32_t vtermno, const char *buf, int count)
{
struct viocharlpevent *viochar;
struct port_info *pi;
HvLpEvent_Rc hvrc;
unsigned long flags;
int sent = 0;
if (vtermno >= VTTY_PORTS)
return -EINVAL;
pi = &port_info[vtermno];
spin_lock_irqsave(&consolelock, flags);
if (viochar_is_console(pi) && !viopath_isactive(pi->lp)) {
HvCall_writeLogBuffer(buf, count);
sent = count;
goto done;
}
viochar = vio_get_event_buffer(viomajorsubtype_chario);
if (viochar == NULL) {
hvlog("\n\rviocons: Can't get viochar buffer.");
goto done;
}
while ((count > 0) && ((pi->seq - pi->ack) < VIOCHAR_WINDOW)) {
int len;
len = (count > VIOCHAR_MAX_DATA) ? VIOCHAR_MAX_DATA : count;
if (viochar_is_console(pi))
HvCall_writeLogBuffer(buf, len);
init_data_event(viochar, pi->lp);
viochar->len = len;
viochar->event.xCorrelationToken = pi->seq++;
viochar->event.xSizeMinus1 =
offsetof(struct viocharlpevent, data) + len;
memcpy(viochar->data, buf, len);
hvrc = HvCallEvent_signalLpEvent(&viochar->event);
if (hvrc)
hvlog("\n\rerror sending event! return code %d\n\r",
(int)hvrc);
sent += len;
count -= len;
buf += len;
}
vio_free_event_buffer(viomajorsubtype_chario, viochar);
done:
spin_unlock_irqrestore(&consolelock, flags);
return sent;
}
static const struct hv_ops hvc_get_put_ops = {
.get_chars = get_chars,
.put_chars = put_chars,
.notifier_add = notifier_add_irq,
.notifier_del = notifier_del_irq,
.notifier_hangup = notifier_hangup_irq,
};
static int __devinit hvc_vio_probe(struct vio_dev *vdev,
const struct vio_device_id *id)
{
struct hvc_struct *hp;
struct port_info *pi;
/* probed with invalid parameters. */
if (!vdev || !id)
return -EPERM;
if (vdev->unit_address >= VTTY_PORTS)
return -ENODEV;
pi = &port_info[vdev->unit_address];
hp = hvc_alloc(vdev->unit_address, vdev->irq, &hvc_get_put_ops,
VIOCHAR_MAX_DATA);
if (IS_ERR(hp))
return PTR_ERR(hp);
pi->hp = hp;
dev_set_drvdata(&vdev->dev, pi);
return 0;
}
static int __devexit hvc_vio_remove(struct vio_dev *vdev)
{
struct port_info *pi = dev_get_drvdata(&vdev->dev);
struct hvc_struct *hp = pi->hp;
return hvc_remove(hp);
}
static struct vio_driver hvc_vio_driver = {
.id_table = hvc_driver_table,
.probe = hvc_vio_probe,
.remove = __devexit_p(hvc_vio_remove),
.driver = {
.name = hvc_driver_name,
.owner = THIS_MODULE,
}
};
static void hvc_open_event(struct HvLpEvent *event)
{
unsigned long flags;
struct viocharlpevent *cevent = (struct viocharlpevent *)event;
u8 port = cevent->virtual_device;
struct port_info *pi;
int reject = 0;
if (hvlpevent_is_ack(event)) {
if (port >= VTTY_PORTS)
return;
spin_lock_irqsave(&consolelock, flags);
pi = &port_info[port];
if (event->xRc == HvLpEvent_Rc_Good) {
pi->seq = pi->ack = 0;
/*
* This line allows connections from the primary
* partition but once one is connected from the
* primary partition nothing short of a reboot
* of linux will allow access from the hosting
* partition again without a required iSeries fix.
*/
pi->lp = event->xTargetLp;
}
spin_unlock_irqrestore(&consolelock, flags);
if (event->xRc != HvLpEvent_Rc_Good)
printk(KERN_WARNING
"hvc: handle_open_event: event->xRc == (%d).\n",
event->xRc);
if (event->xCorrelationToken != 0) {
atomic_t *aptr= (atomic_t *)event->xCorrelationToken;
atomic_set(aptr, 1);
} else
printk(KERN_WARNING
"hvc: weird...got open ack without atomic\n");
return;
}
/* This had better require an ack, otherwise complain */
if (!hvlpevent_need_ack(event)) {
printk(KERN_WARNING "hvc: viocharopen without ack bit!\n");
return;
}
spin_lock_irqsave(&consolelock, flags);
/* Make sure this is a good virtual tty */
if (port >= VTTY_PORTS) {
event->xRc = HvLpEvent_Rc_SubtypeError;
cevent->subtype_result_code = viorc_openRejected;
/*
* Flag state here since we can't printk while holding
* the consolelock spinlock.
*/
reject = 1;
} else {
pi = &port_info[port];
if ((pi->lp != HvLpIndexInvalid) &&
(pi->lp != event->xSourceLp)) {
/*
* If this is tty is already connected to a different
* partition, fail.
*/
event->xRc = HvLpEvent_Rc_SubtypeError;
cevent->subtype_result_code = viorc_openRejected;
reject = 2;
} else {
pi->lp = event->xSourceLp;
event->xRc = HvLpEvent_Rc_Good;
cevent->subtype_result_code = viorc_good;
pi->seq = pi->ack = 0;
}
}
spin_unlock_irqrestore(&consolelock, flags);
if (reject == 1)
printk(KERN_WARNING "hvc: open rejected: bad virtual tty.\n");
else if (reject == 2)
printk(KERN_WARNING "hvc: open rejected: console in exclusive "
"use by another partition.\n");
/* Return the acknowledgement */
HvCallEvent_ackLpEvent(event);
}
/*
* Handle a close charLpEvent. This should ONLY be an Interrupt because the
* virtual console should never actually issue a close event to the hypervisor
* because the virtual console never goes away. A close event coming from the
* hypervisor simply means that there are no client consoles connected to the
* virtual console.
*/
static void hvc_close_event(struct HvLpEvent *event)
{
unsigned long flags;
struct viocharlpevent *cevent = (struct viocharlpevent *)event;
u8 port = cevent->virtual_device;
if (!hvlpevent_is_int(event)) {
printk(KERN_WARNING
"hvc: got unexpected close acknowledgement\n");
return;
}
if (port >= VTTY_PORTS) {
printk(KERN_WARNING
"hvc: close message from invalid virtual device.\n");
return;
}
/* For closes, just mark the console partition invalid */
spin_lock_irqsave(&consolelock, flags);
if (port_info[port].lp == event->xSourceLp)
port_info[port].lp = HvLpIndexInvalid;
spin_unlock_irqrestore(&consolelock, flags);
}
static void hvc_data_event(struct HvLpEvent *event)
{
unsigned long flags;
struct viocharlpevent *cevent = (struct viocharlpevent *)event;
struct port_info *pi;
int n;
u8 port = cevent->virtual_device;
if (port >= VTTY_PORTS) {
printk(KERN_WARNING "hvc: data on invalid virtual device %d\n",
port);
return;
}
if (cevent->len == 0)
return;
/*
* Change 05/01/2003 - Ryan Arnold: If a partition other than
* the current exclusive partition tries to send us data
* events then just drop them on the floor because we don't
* want his stinking data. He isn't authorized to receive
* data because he wasn't the first one to get the console,
* therefore he shouldn't be allowed to send data either.
* This will work without an iSeries fix.
*/
pi = &port_info[port];
if (pi->lp != event->xSourceLp)
return;
spin_lock_irqsave(&consolelock, flags);
n = IN_BUF_SIZE - pi->in_end;
if (n > cevent->len)
n = cevent->len;
if (n > 0) {
memcpy(&pi->in_buf[pi->in_end], cevent->data, n);
pi->in_end += n;
}
spin_unlock_irqrestore(&consolelock, flags);
if (n == 0)
printk(KERN_WARNING "hvc: input buffer overflow\n");
}
static void hvc_ack_event(struct HvLpEvent *event)
{
struct viocharlpevent *cevent = (struct viocharlpevent *)event;
unsigned long flags;
u8 port = cevent->virtual_device;
if (port >= VTTY_PORTS) {
printk(KERN_WARNING "hvc: data on invalid virtual device\n");
return;
}
spin_lock_irqsave(&consolelock, flags);
port_info[port].ack = event->xCorrelationToken;
spin_unlock_irqrestore(&consolelock, flags);
}
static void hvc_config_event(struct HvLpEvent *event)
{
struct viocharlpevent *cevent = (struct viocharlpevent *)event;
if (cevent->data[0] == 0x01)
printk(KERN_INFO "hvc: window resized to %d: %d: %d: %d\n",
cevent->data[1], cevent->data[2],
cevent->data[3], cevent->data[4]);
else
printk(KERN_WARNING "hvc: unknown config event\n");
}
static void hvc_handle_event(struct HvLpEvent *event)
{
int charminor;
if (event == NULL)
return;
charminor = event->xSubtype & VIOMINOR_SUBTYPE_MASK;
switch (charminor) {
case viocharopen:
hvc_open_event(event);
break;
case viocharclose:
hvc_close_event(event);
break;
case viochardata:
hvc_data_event(event);
break;
case viocharack:
hvc_ack_event(event);
break;
case viocharconfig:
hvc_config_event(event);
break;
default:
if (hvlpevent_is_int(event) && hvlpevent_need_ack(event)) {
event->xRc = HvLpEvent_Rc_InvalidSubtype;
HvCallEvent_ackLpEvent(event);
}
}
}
static int __init send_open(HvLpIndex remoteLp, void *sem)
{
return HvCallEvent_signalLpEventFast(remoteLp,
HvLpEvent_Type_VirtualIo,
viomajorsubtype_chario | viocharopen,
HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
viopath_sourceinst(remoteLp),
viopath_targetinst(remoteLp),
(u64)(unsigned long)sem, VIOVERSION << 16,
0, 0, 0, 0);
}
static int __init hvc_vio_init(void)
{
atomic_t wait_flag;
int rc;
if (!firmware_has_feature(FW_FEATURE_ISERIES))
return -EIO;
/* +2 for fudge */
rc = viopath_open(HvLpConfig_getPrimaryLpIndex(),
viomajorsubtype_chario, VIOCHAR_WINDOW + 2);
if (rc)
printk(KERN_WARNING "hvc: error opening to primary %d\n", rc);
if (viopath_hostLp == HvLpIndexInvalid)
vio_set_hostlp();
/*
* And if the primary is not the same as the hosting LP, open to the
* hosting lp
*/
if ((viopath_hostLp != HvLpIndexInvalid) &&
(viopath_hostLp != HvLpConfig_getPrimaryLpIndex())) {
printk(KERN_INFO "hvc: open path to hosting (%d)\n",
viopath_hostLp);
rc = viopath_open(viopath_hostLp, viomajorsubtype_chario,
VIOCHAR_WINDOW + 2); /* +2 for fudge */
if (rc)
printk(KERN_WARNING
"error opening to partition %d: %d\n",
viopath_hostLp, rc);
}
if (vio_setHandler(viomajorsubtype_chario, hvc_handle_event) < 0)
printk(KERN_WARNING
"hvc: error seting handler for console events!\n");
/*
* First, try to open the console to the hosting lp.
* Wait on a semaphore for the response.
*/
atomic_set(&wait_flag, 0);
if ((viopath_isactive(viopath_hostLp)) &&
(send_open(viopath_hostLp, &wait_flag) == 0)) {
printk(KERN_INFO "hvc: hosting partition %d\n", viopath_hostLp);
while (atomic_read(&wait_flag) == 0)
mb();
atomic_set(&wait_flag, 0);
}
/*
* If we don't have an active console, try the primary
*/
if ((!viopath_isactive(port_info[0].lp)) &&
(viopath_isactive(HvLpConfig_getPrimaryLpIndex())) &&
(send_open(HvLpConfig_getPrimaryLpIndex(), &wait_flag) == 0)) {
printk(KERN_INFO "hvc: opening console to primary partition\n");
while (atomic_read(&wait_flag) == 0)
mb();
}
/* Register as a vio device to receive callbacks */
rc = vio_register_driver(&hvc_vio_driver);
return rc;
}
module_init(hvc_vio_init); /* after drivers/char/hvc_console.c */
static void __exit hvc_vio_exit(void)
{
vio_unregister_driver(&hvc_vio_driver);
}
module_exit(hvc_vio_exit);
/* the device tree order defines our numbering */
static int __init hvc_find_vtys(void)
{
struct device_node *vty;
int num_found = 0;
for (vty = of_find_node_by_name(NULL, "vty"); vty != NULL;
vty = of_find_node_by_name(vty, "vty")) {
const uint32_t *vtermno;
/* We have statically defined space for only a certain number
* of console adapters.
*/
if ((num_found >= MAX_NR_HVC_CONSOLES) ||
(num_found >= VTTY_PORTS)) {
of_node_put(vty);
break;
}
vtermno = of_get_property(vty, "reg", NULL);
if (!vtermno)
continue;
if (!of_device_is_compatible(vty, "IBM,iSeries-vty"))
continue;
if (num_found == 0)
add_preferred_console("hvc", 0, NULL);
hvc_instantiate(*vtermno, num_found, &hvc_get_put_ops);
++num_found;
}
return num_found;
}
console_initcall(hvc_find_vtys);

1337
drivers/char/hvc_iucv.c
View File

File diff suppressed because it is too large Load Diff

133
drivers/char/hvc_rtas.c
View File

@@ -1,133 +0,0 @@
/*
* IBM RTAS driver interface to hvc_console.c
*
* (C) Copyright IBM Corporation 2001-2005
* (C) Copyright Red Hat, Inc. 2005
*
* Author(s): Maximino Augilar <IBM STI Design Center>
* : Ryan S. Arnold <rsa@us.ibm.com>
* : Utz Bacher <utz.bacher@de.ibm.com>
* : David Woodhouse <dwmw2@infradead.org>
*
* inspired by drivers/char/hvc_console.c
* written by Anton Blanchard and Paul Mackerras
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <asm/irq.h>
#include <asm/rtas.h>
#include "hvc_console.h"
#define hvc_rtas_cookie 0x67781e15
struct hvc_struct *hvc_rtas_dev;
static int rtascons_put_char_token = RTAS_UNKNOWN_SERVICE;
static int rtascons_get_char_token = RTAS_UNKNOWN_SERVICE;
static inline int hvc_rtas_write_console(uint32_t vtermno, const char *buf,
int count)
{
int i;
for (i = 0; i < count; i++) {
if (rtas_call(rtascons_put_char_token, 1, 1, NULL, buf[i]))
break;
}
return i;
}
static int hvc_rtas_read_console(uint32_t vtermno, char *buf, int count)
{
int i, c;
for (i = 0; i < count; i++) {
if (rtas_call(rtascons_get_char_token, 0, 2, &c))
break;
buf[i] = c;
}
return i;
}
static const struct hv_ops hvc_rtas_get_put_ops = {
.get_chars = hvc_rtas_read_console,
.put_chars = hvc_rtas_write_console,
};
static int __init hvc_rtas_init(void)
{
struct hvc_struct *hp;
if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
rtascons_put_char_token = rtas_token("put-term-char");
if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
return -EIO;
if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
rtascons_get_char_token = rtas_token("get-term-char");
if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
return -EIO;
BUG_ON(hvc_rtas_dev);
/* Allocate an hvc_struct for the console device we instantiated
* earlier. Save off hp so that we can return it on exit */
hp = hvc_alloc(hvc_rtas_cookie, NO_IRQ, &hvc_rtas_get_put_ops, 16);
if (IS_ERR(hp))
return PTR_ERR(hp);
hvc_rtas_dev = hp;
return 0;
}
module_init(hvc_rtas_init);
/* This will tear down the tty portion of the driver */
static void __exit hvc_rtas_exit(void)
{
/* Really the fun isn't over until the worker thread breaks down and
* the tty cleans up */
if (hvc_rtas_dev)
hvc_remove(hvc_rtas_dev);
}
module_exit(hvc_rtas_exit);
/* This will happen prior to module init. There is no tty at this time? */
static int __init hvc_rtas_console_init(void)
{
rtascons_put_char_token = rtas_token("put-term-char");
if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
return -EIO;
rtascons_get_char_token = rtas_token("get-term-char");
if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
return -EIO;
hvc_instantiate(hvc_rtas_cookie, 0, &hvc_rtas_get_put_ops);
add_preferred_console("hvc", 0, NULL);
return 0;
}
console_initcall(hvc_rtas_console_init);

68
drivers/char/hvc_tile.c
View File

@@ -1,68 +0,0 @@
/*
* Copyright 2010 Tilera Corporation. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for
* more details.
*
* Tilera TILE Processor hypervisor console
*/
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <hv/hypervisor.h>
#include "hvc_console.h"
static int hvc_tile_put_chars(uint32_t vt, const char *buf, int count)
{
return hv_console_write((HV_VirtAddr)buf, count);
}
static int hvc_tile_get_chars(uint32_t vt, char *buf, int count)
{
int i, c;
for (i = 0; i < count; ++i) {
c = hv_console_read_if_ready();
if (c < 0)
break;
buf[i] = c;
}
return i;
}
static const struct hv_ops hvc_tile_get_put_ops = {
.get_chars = hvc_tile_get_chars,
.put_chars = hvc_tile_put_chars,
};
static int __init hvc_tile_console_init(void)
{
extern void disable_early_printk(void);
hvc_instantiate(0, 0, &hvc_tile_get_put_ops);
add_preferred_console("hvc", 0, NULL);
disable_early_printk();
return 0;
}
console_initcall(hvc_tile_console_init);
static int __init hvc_tile_init(void)
{
struct hvc_struct *s;
s = hvc_alloc(0, 0, &hvc_tile_get_put_ops, 128);
return IS_ERR(s) ? PTR_ERR(s) : 0;
}
device_initcall(hvc_tile_init);

96
drivers/char/hvc_udbg.c
View File

@@ -1,96 +0,0 @@
/*
* udbg interface to hvc_console.c
*
* (C) Copyright David Gibson, IBM Corporation 2008.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/irq.h>
#include <asm/udbg.h>
#include "hvc_console.h"
struct hvc_struct *hvc_udbg_dev;
static int hvc_udbg_put(uint32_t vtermno, const char *buf, int count)
{
int i;
for (i = 0; i < count; i++)
udbg_putc(buf[i]);
return i;
}
static int hvc_udbg_get(uint32_t vtermno, char *buf, int count)
{
int i, c;
if (!udbg_getc_poll)
return 0;
for (i = 0; i < count; i++) {
if ((c = udbg_getc_poll()) == -1)
break;
buf[i] = c;
}
return i;
}
static const struct hv_ops hvc_udbg_ops = {
.get_chars = hvc_udbg_get,
.put_chars = hvc_udbg_put,
};
static int __init hvc_udbg_init(void)
{
struct hvc_struct *hp;
BUG_ON(hvc_udbg_dev);
hp = hvc_alloc(0, NO_IRQ, &hvc_udbg_ops, 16);
if (IS_ERR(hp))
return PTR_ERR(hp);
hvc_udbg_dev = hp;
return 0;
}
module_init(hvc_udbg_init);
static void __exit hvc_udbg_exit(void)
{
if (hvc_udbg_dev)
hvc_remove(hvc_udbg_dev);
}
module_exit(hvc_udbg_exit);
static int __init hvc_udbg_console_init(void)
{
hvc_instantiate(0, 0, &hvc_udbg_ops);
add_preferred_console("hvc", 0, NULL);
return 0;
}
console_initcall(hvc_udbg_console_init);

173
drivers/char/hvc_vio.c
View File

@@ -1,173 +0,0 @@
/*
* vio driver interface to hvc_console.c
*
* This code was moved here to allow the remaing code to be reused as a
* generic polling mode with semi-reliable transport driver core to the
* console and tty subsystems.
*
*
* Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
* Copyright (C) 2001 Paul Mackerras <paulus@au.ibm.com>, IBM
* Copyright (C) 2004 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
* Copyright (C) 2004 IBM Corporation
*
* Additional Author(s):
* Ryan S. Arnold <rsa@us.ibm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/types.h>
#include <linux/init.h>
#include <asm/hvconsole.h>
#include <asm/vio.h>
#include <asm/prom.h>
#include <asm/firmware.h>
#include "hvc_console.h"
static const char hvc_driver_name[] = "hvc_console";
static struct vio_device_id hvc_driver_table[] __devinitdata = {
{"serial", "hvterm1"},
{ "", "" }
};
MODULE_DEVICE_TABLE(vio, hvc_driver_table);
static int filtered_get_chars(uint32_t vtermno, char *buf, int count)
{
unsigned long got;
int i;
/*
* Vio firmware will read up to SIZE_VIO_GET_CHARS at its own discretion
* so we play safe and avoid the situation where got > count which could
* overload the flip buffer.
*/
if (count < SIZE_VIO_GET_CHARS)
return -EAGAIN;
got = hvc_get_chars(vtermno, buf, count);
/*
* Work around a HV bug where it gives us a null
* after every \r. -- paulus
*/
for (i = 1; i < got; ++i) {
if (buf[i] == 0 && buf[i-1] == '\r') {
--got;
if (i < got)
memmove(&buf[i], &buf[i+1],
got - i);
}
}
return got;
}
static const struct hv_ops hvc_get_put_ops = {
.get_chars = filtered_get_chars,
.put_chars = hvc_put_chars,
.notifier_add = notifier_add_irq,
.notifier_del = notifier_del_irq,
.notifier_hangup = notifier_hangup_irq,
};
static int __devinit hvc_vio_probe(struct vio_dev *vdev,
const struct vio_device_id *id)
{
struct hvc_struct *hp;
/* probed with invalid parameters. */
if (!vdev || !id)
return -EPERM;
hp = hvc_alloc(vdev->unit_address, vdev->irq, &hvc_get_put_ops,
MAX_VIO_PUT_CHARS);
if (IS_ERR(hp))
return PTR_ERR(hp);
dev_set_drvdata(&vdev->dev, hp);
return 0;
}
static int __devexit hvc_vio_remove(struct vio_dev *vdev)
{
struct hvc_struct *hp = dev_get_drvdata(&vdev->dev);
return hvc_remove(hp);
}
static struct vio_driver hvc_vio_driver = {
.id_table = hvc_driver_table,
.probe = hvc_vio_probe,
.remove = __devexit_p(hvc_vio_remove),
.driver = {
.name = hvc_driver_name,
.owner = THIS_MODULE,
}
};
static int __init hvc_vio_init(void)
{
int rc;
if (firmware_has_feature(FW_FEATURE_ISERIES))
return -EIO;
/* Register as a vio device to receive callbacks */
rc = vio_register_driver(&hvc_vio_driver);
return rc;
}
module_init(hvc_vio_init); /* after drivers/char/hvc_console.c */
static void __exit hvc_vio_exit(void)
{
vio_unregister_driver(&hvc_vio_driver);
}
module_exit(hvc_vio_exit);
/* the device tree order defines our numbering */
static int hvc_find_vtys(void)
{
struct device_node *vty;
int num_found = 0;
for (vty = of_find_node_by_name(NULL, "vty"); vty != NULL;
vty = of_find_node_by_name(vty, "vty")) {
const uint32_t *vtermno;
/* We have statically defined space for only a certain number
* of console adapters.
*/
if (num_found >= MAX_NR_HVC_CONSOLES) {
of_node_put(vty);
break;
}
vtermno = of_get_property(vty, "reg", NULL);
if (!vtermno)
continue;
if (of_device_is_compatible(vty, "hvterm1")) {
hvc_instantiate(*vtermno, num_found, &hvc_get_put_ops);
++num_found;
}
}
return num_found;
}
console_initcall(hvc_find_vtys);

271
drivers/char/hvc_xen.c
View File

@@ -1,271 +0,0 @@
/*
* xen console driver interface to hvc_console.c
*
* (c) 2007 Gerd Hoffmann <kraxel@suse.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/types.h>
#include <asm/xen/hypervisor.h>
#include <xen/xen.h>
#include <xen/page.h>
#include <xen/events.h>
#include <xen/interface/io/console.h>
#include <xen/hvc-console.h>
#include "hvc_console.h"
#define HVC_COOKIE 0x58656e /* "Xen" in hex */
static struct hvc_struct *hvc;
static int xencons_irq;
/* ------------------------------------------------------------------ */
static unsigned long console_pfn = ~0ul;
static inline struct xencons_interface *xencons_interface(void)
{
if (console_pfn == ~0ul)
return mfn_to_virt(xen_start_info->console.domU.mfn);
else
return __va(console_pfn << PAGE_SHIFT);
}
static inline void notify_daemon(void)
{
/* Use evtchn: this is called early, before irq is set up. */
notify_remote_via_evtchn(xen_start_info->console.domU.evtchn);
}
static int __write_console(const char *data, int len)
{
struct xencons_interface *intf = xencons_interface();
XENCONS_RING_IDX cons, prod;
int sent = 0;
cons = intf->out_cons;
prod = intf->out_prod;
mb(); /* update queue values before going on */
BUG_ON((prod - cons) > sizeof(intf->out));
while ((sent < len) && ((prod - cons) < sizeof(intf->out)))
intf->out[MASK_XENCONS_IDX(prod++, intf->out)] = data[sent++];
wmb(); /* write ring before updating pointer */
intf->out_prod = prod;
if (sent)
notify_daemon();
return sent;
}
static int domU_write_console(uint32_t vtermno, const char *data, int len)
{
int ret = len;
/*
* Make sure the whole buffer is emitted, polling if
* necessary. We don't ever want to rely on the hvc daemon
* because the most interesting console output is when the
* kernel is crippled.
*/
while (len) {
int sent = __write_console(data, len);
data += sent;
len -= sent;
if (unlikely(len))
HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
}
return ret;
}
static int domU_read_console(uint32_t vtermno, char *buf, int len)
{
struct xencons_interface *intf = xencons_interface();
XENCONS_RING_IDX cons, prod;
int recv = 0;
cons = intf->in_cons;
prod = intf->in_prod;
mb(); /* get pointers before reading ring */
BUG_ON((prod - cons) > sizeof(intf->in));
while (cons != prod && recv < len)
buf[recv++] = intf->in[MASK_XENCONS_IDX(cons++, intf->in)];
mb(); /* read ring before consuming */
intf->in_cons = cons;
notify_daemon();
return recv;
}
static struct hv_ops domU_hvc_ops = {
.get_chars = domU_read_console,
.put_chars = domU_write_console,
.notifier_add = notifier_add_irq,
.notifier_del = notifier_del_irq,
.notifier_hangup = notifier_hangup_irq,
};
static int dom0_read_console(uint32_t vtermno, char *buf, int len)
{
return HYPERVISOR_console_io(CONSOLEIO_read, len, buf);
}
/*
* Either for a dom0 to write to the system console, or a domU with a
* debug version of Xen
*/
static int dom0_write_console(uint32_t vtermno, const char *str, int len)
{
int rc = HYPERVISOR_console_io(CONSOLEIO_write, len, (char *)str);
if (rc < 0)
return 0;
return len;
}
static struct hv_ops dom0_hvc_ops = {
.get_chars = dom0_read_console,
.put_chars = dom0_write_console,
.notifier_add = notifier_add_irq,
.notifier_del = notifier_del_irq,
.notifier_hangup = notifier_hangup_irq,
};
static int __init xen_hvc_init(void)
{
struct hvc_struct *hp;
struct hv_ops *ops;
if (!xen_pv_domain())
return -ENODEV;
if (xen_initial_domain()) {
ops = &dom0_hvc_ops;
xencons_irq = bind_virq_to_irq(VIRQ_CONSOLE, 0);
} else {
if (!xen_start_info->console.domU.evtchn)
return -ENODEV;
ops = &domU_hvc_ops;
xencons_irq = bind_evtchn_to_irq(xen_start_info->console.domU.evtchn);
}
if (xencons_irq < 0)
xencons_irq = 0; /* NO_IRQ */
hp = hvc_alloc(HVC_COOKIE, xencons_irq, ops, 256);
if (IS_ERR(hp))
return PTR_ERR(hp);
hvc = hp;
console_pfn = mfn_to_pfn(xen_start_info->console.domU.mfn);
return 0;
}
void xen_console_resume(void)
{
if (xencons_irq)
rebind_evtchn_irq(xen_start_info->console.domU.evtchn, xencons_irq);
}
static void __exit xen_hvc_fini(void)
{
if (hvc)
hvc_remove(hvc);
}
static int xen_cons_init(void)
{
struct hv_ops *ops;
if (!xen_pv_domain())
return 0;
if (xen_initial_domain())
ops = &dom0_hvc_ops;
else
ops = &domU_hvc_ops;
hvc_instantiate(HVC_COOKIE, 0, ops);
return 0;
}
module_init(xen_hvc_init);
module_exit(xen_hvc_fini);
console_initcall(xen_cons_init);
#ifdef CONFIG_EARLY_PRINTK
static void xenboot_write_console(struct console *console, const char *string,
unsigned len)
{
unsigned int linelen, off = 0;
const char *pos;
dom0_write_console(0, string, len);
if (xen_initial_domain())
return;
domU_write_console(0, "(early) ", 8);
while (off < len && NULL != (pos = strchr(string+off, '\n'))) {
linelen = pos-string+off;
if (off + linelen > len)
break;
domU_write_console(0, string+off, linelen);
domU_write_console(0, "\r\n", 2);
off += linelen + 1;
}
if (off < len)
domU_write_console(0, string+off, len-off);
}
struct console xenboot_console = {
.name = "xenboot",
.write = xenboot_write_console,
.flags = CON_PRINTBUFFER | CON_BOOT | CON_ANYTIME,
};
#endif /* CONFIG_EARLY_PRINTK */
void xen_raw_console_write(const char *str)
{
dom0_write_console(0, str, strlen(str));
}
void xen_raw_printk(const char *fmt, ...)
{
static char buf[512];
va_list ap;
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
xen_raw_console_write(buf);
}

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drivers/char/hvcs.c
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drivers/char/hvsi.c
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drivers/char/virtio_console.c
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