forked from Minki/linux
119ea10947
Virtio consoles can be hotplugged, so hvc_alloc gets called from multiple sites: from the initial probe() routine as well as later on from workqueue handlers which aren't __devinit code. So, drop the __devinit annotation for hvc_alloc. Signed-off-by: Amit Shah <amit.shah@redhat.com> Cc: linuxppc-dev@ozlabs.org Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
120 lines
3.6 KiB
C
120 lines
3.6 KiB
C
/*
|
|
* 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
|