]> err.no Git - linux-2.6/commitdiff
powerpc/iseries: remove the old viocons driver
authorStephen Rothwell <sfr@canb.auug.org.au>
Thu, 7 Aug 2008 04:08:27 +0000 (14:08 +1000)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 8 Aug 2008 01:07:10 +0000 (18:07 -0700)
This driver was declared obsolete over 2 years ago, the alternative
console driver for legacy iSeries (hvc_iseries) was made the default
over 1 year ago and this driver has been build broken for over 3
months, so remove it.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/powerpc/platforms/iseries/Kconfig
drivers/char/Kconfig
drivers/char/Makefile
drivers/char/viocons.c [deleted file]

index ea3e541ac74f306d1dee49cedc96dad2d8ebbdad..45ffd8e542f4b79757dba792031cbe7d8295a704 100644 (file)
@@ -7,15 +7,6 @@ config PPC_ISERIES
 menu "iSeries device drivers"
        depends on PPC_ISERIES
 
-config VIOCONS
-       bool "iSeries Virtual Console Support (Obsolete)"
-       depends on !HVC_ISERIES
-       default n
-       help
-         This is the old virtual console driver for legacy iSeries.
-         You should use the iSeries Hypervisor Virtual Console
-         support instead.
-
 config VIODASD
        tristate "iSeries Virtual I/O disk support"
        help
@@ -38,5 +29,5 @@ endmenu
 
 config VIOPATH
        bool
-       depends on VIOCONS || VIODASD || VIOCD || VIOTAPE || ISERIES_VETH
+       depends on VIODASD || VIOCD || VIOTAPE || ISERIES_VETH
        default y
index d0ac944e16961775d5bb428e851ab0ea0e4d7494..caff85149b9d43897730d8fb9319ca1c36b9ca87 100644 (file)
@@ -8,7 +8,7 @@ config VT
        bool "Virtual terminal" if EMBEDDED
        depends on !S390
        select INPUT
-       default y if !VIOCONS
+       default y
        ---help---
          If you say Y here, you will get support for terminal devices with
          display and keyboard devices. These are called "virtual" because you
index 8a161c30e1dc1670ebd5576ccc7669fdc857aaf7..6850f6da75762169374b44a654679d5681f05a1e 100644 (file)
@@ -55,7 +55,6 @@ 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-$(CONFIG_VIOCONS)          += viocons.o
 obj-$(CONFIG_VIOTAPE)          += viotape.o
 obj-$(CONFIG_HVCS)             += hvcs.o
 obj-$(CONFIG_IBM_BSR)          += bsr.o
diff --git a/drivers/char/viocons.c b/drivers/char/viocons.c
deleted file mode 100644 (file)
index 7feeb77..0000000
+++ /dev/null
@@ -1,1167 +0,0 @@
-/* -*- linux-c -*-
- *
- *  drivers/char/viocons.c
- *
- *  iSeries Virtual Terminal
- *
- *  Authors: Dave Boutcher <boutcher@us.ibm.com>
- *           Ryan Arnold <ryanarn@us.ibm.com>
- *           Colin Devilbiss <devilbis@us.ibm.com>
- *           Stephen Rothwell
- *
- * (C) Copyright 2000, 2001, 2002, 2003, 2004 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) anyu 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/kernel.h>
-#include <linux/proc_fs.h>
-#include <linux/errno.h>
-#include <linux/vmalloc.h>
-#include <linux/mm.h>
-#include <linux/console.h>
-#include <linux/module.h>
-#include <asm/uaccess.h>
-#include <linux/init.h>
-#include <linux/wait.h>
-#include <linux/spinlock.h>
-#include <asm/ioctls.h>
-#include <linux/kd.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/sysrq.h>
-
-#include <asm/firmware.h>
-#include <asm/iseries/vio.h>
-#include <asm/iseries/hv_lp_event.h>
-#include <asm/iseries/hv_call_event.h>
-#include <asm/iseries/hv_lp_config.h>
-#include <asm/iseries/hv_call.h>
-
-#ifdef CONFIG_VT
-#error You must turn off CONFIG_VT to use CONFIG_VIOCONS
-#endif
-
-#define VIOTTY_MAGIC (0x0DCB)
-#define VTTY_PORTS 10
-
-#define VIOCONS_KERN_WARN      KERN_WARNING "viocons: "
-#define VIOCONS_KERN_INFO      KERN_INFO "viocons: "
-
-static DEFINE_SPINLOCK(consolelock);
-static DEFINE_SPINLOCK(consoleloglock);
-
-static int vio_sysrq_pressed;
-
-#define VIOCHAR_NUM_BUF                16
-
-/*
- * Our port information.  We store a pointer to one entry in the
- * tty_driver_data
- */
-static struct port_info {
-       int magic;
-       struct tty_struct *tty;
-       HvLpIndex lp;
-       u8 vcons;
-       u64 seq;        /* sequence number of last HV send */
-       u64 ack;        /* last ack from HV */
-/*
- * When we get writes faster than we can send it to the partition,
- * buffer the data here. Note that used is a bit map of used buffers.
- * It had better have enough bits to hold VIOCHAR_NUM_BUF the bitops assume
- * it is a multiple of unsigned long
- */
-       unsigned long used;
-       u8 *buffer[VIOCHAR_NUM_BUF];
-       int bufferBytes[VIOCHAR_NUM_BUF];
-       int curbuf;
-       int bufferOverflow;
-       int overflowMessage;
-} port_info[VTTY_PORTS];
-
-#define viochar_is_console(pi) ((pi) == &port_info[0])
-#define viochar_port(pi)       ((pi) - &port_info[0])
-
-static void initDataEvent(struct viocharlpevent *viochar, HvLpIndex lp);
-
-static struct tty_driver *viotty_driver;
-
-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);
-}
-
-static void hvlogOutput(const char *buf, int count)
-{
-       unsigned long flags;
-       int begin;
-       int index;
-       static const char cr = '\r';
-
-       begin = 0;
-       spin_lock_irqsave(&consoleloglock, flags);
-       for (index = 0; index < count; index++) {
-               if (buf[index] == '\n') {
-                       /*
-                        * Start right after the last '\n' or at the zeroth
-                        * array position and output the number of characters
-                        * including the newline.
-                        */
-                       HvCall_writeLogBuffer(&buf[begin], index - begin + 1);
-                       begin = index + 1;
-                       HvCall_writeLogBuffer(&cr, 1);
-               }
-       }
-       if ((index - begin) > 0)
-               HvCall_writeLogBuffer(&buf[begin], index - begin);
-       spin_unlock_irqrestore(&consoleloglock, flags);
-}
-
-/*
- * Make sure we're pointing to a valid port_info structure.  Shamelessly
- * plagerized from serial.c
- */
-static inline int viotty_paranoia_check(struct port_info *pi,
-                                       char *name, const char *routine)
-{
-       static const char *bad_pi_addr = VIOCONS_KERN_WARN
-               "warning: bad address for port_info struct (%s) in %s\n";
-       static const char *badmagic = VIOCONS_KERN_WARN
-               "warning: bad magic number for port_info struct (%s) in %s\n";
-
-       if ((pi < &port_info[0]) || (viochar_port(pi) > VTTY_PORTS)) {
-               printk(bad_pi_addr, name, routine);
-               return 1;
-       }
-       if (pi->magic != VIOTTY_MAGIC) {
-               printk(badmagic, name, routine);
-               return 1;
-       }
-       return 0;
-}
-
-/*
- * Add data to our pending-send buffers.  
- *
- * NOTE: Don't use printk in here because it gets nastily recursive.
- * hvlog can be used to log to the hypervisor buffer
- */
-static int buffer_add(struct port_info *pi, const char *buf, size_t len)
-{
-       size_t bleft;
-       size_t curlen;
-       const char *curbuf;
-       int nextbuf;
-
-       curbuf = buf;
-       bleft = len;
-       while (bleft > 0) {
-               /*
-                * If there is no space left in the current buffer, we have
-                * filled everything up, so return.  If we filled the previous
-                * buffer we would already have moved to the next one.
-                */
-               if (pi->bufferBytes[pi->curbuf] == VIOCHAR_MAX_DATA) {
-                       hvlog ("\n\rviocons: No overflow buffer available for memcpy().\n");
-                       pi->bufferOverflow++;
-                       pi->overflowMessage = 1;
-                       break;
-               }
-
-               /*
-                * Turn on the "used" bit for this buffer.  If it's already on,
-                * that's fine.
-                */
-               set_bit(pi->curbuf, &pi->used);
-
-               /*
-                * See if this buffer has been allocated.  If not, allocate it.
-                */
-               if (pi->buffer[pi->curbuf] == NULL) {
-                       pi->buffer[pi->curbuf] =
-                           kmalloc(VIOCHAR_MAX_DATA, GFP_ATOMIC);
-                       if (pi->buffer[pi->curbuf] == NULL) {
-                               hvlog("\n\rviocons: kmalloc failed allocating spaces for buffer %d.",
-                                       pi->curbuf);
-                               break;
-                       }
-               }
-
-               /* Figure out how much we can copy into this buffer. */
-               if (bleft < (VIOCHAR_MAX_DATA - pi->bufferBytes[pi->curbuf]))
-                       curlen = bleft;
-               else
-                       curlen = VIOCHAR_MAX_DATA - pi->bufferBytes[pi->curbuf];
-
-               /* Copy the data into the buffer. */
-               memcpy(pi->buffer[pi->curbuf] + pi->bufferBytes[pi->curbuf],
-                               curbuf, curlen);
-
-               pi->bufferBytes[pi->curbuf] += curlen;
-               curbuf += curlen;
-               bleft -= curlen;
-
-               /*
-                * Now see if we've filled this buffer.  If not then
-                * we'll try to use it again later.  If we've filled it
-                * up then we'll advance the curbuf to the next in the
-                * circular queue.
-                */
-               if (pi->bufferBytes[pi->curbuf] == VIOCHAR_MAX_DATA) {
-                       nextbuf = (pi->curbuf + 1) % VIOCHAR_NUM_BUF;
-                       /*
-                        * Move to the next buffer if it hasn't been used yet
-                        */
-                       if (test_bit(nextbuf, &pi->used) == 0)
-                               pi->curbuf = nextbuf;
-               }
-       }
-       return len - bleft;
-}
-
-/*
- * Send pending data
- *
- * NOTE: Don't use printk in here because it gets nastily recursive.
- * hvlog can be used to log to the hypervisor buffer
- */
-static void send_buffers(struct port_info *pi)
-{
-       HvLpEvent_Rc hvrc;
-       int nextbuf;
-       struct viocharlpevent *viochar;
-       unsigned long flags;
-
-       spin_lock_irqsave(&consolelock, flags);
-
-       viochar = (struct viocharlpevent *)
-           vio_get_event_buffer(viomajorsubtype_chario);
-
-       /* Make sure we got a buffer */
-       if (viochar == NULL) {
-               hvlog("\n\rviocons: Can't get viochar buffer in sendBuffers().");
-               spin_unlock_irqrestore(&consolelock, flags);
-               return;
-       }
-
-       if (pi->used == 0) {
-               hvlog("\n\rviocons: in sendbuffers(), but no buffers used.\n");
-               vio_free_event_buffer(viomajorsubtype_chario, viochar);
-               spin_unlock_irqrestore(&consolelock, flags);
-               return;
-       }
-
-       /*
-        * curbuf points to the buffer we're filling.  We want to
-        * start sending AFTER this one.  
-        */
-       nextbuf = (pi->curbuf + 1) % VIOCHAR_NUM_BUF;
-
-       /*
-        * Loop until we find a buffer with the used bit on
-        */
-       while (test_bit(nextbuf, &pi->used) == 0)
-               nextbuf = (nextbuf + 1) % VIOCHAR_NUM_BUF;
-
-       initDataEvent(viochar, pi->lp);
-
-       /*
-        * While we have buffers with data, and our send window
-        * is open, send them
-        */
-       while ((test_bit(nextbuf, &pi->used)) &&
-              ((pi->seq - pi->ack) < VIOCHAR_WINDOW)) {
-               viochar->len = pi->bufferBytes[nextbuf];
-               viochar->event.xCorrelationToken = pi->seq++;
-               viochar->event.xSizeMinus1 =
-                       offsetof(struct viocharlpevent, data) + viochar->len;
-
-               memcpy(viochar->data, pi->buffer[nextbuf], viochar->len);
-
-               hvrc = HvCallEvent_signalLpEvent(&viochar->event);
-               if (hvrc) {
-                       /*
-                        * MUST unlock the spinlock before doing a printk
-                        */
-                       vio_free_event_buffer(viomajorsubtype_chario, viochar);
-                       spin_unlock_irqrestore(&consolelock, flags);
-
-                       printk(VIOCONS_KERN_WARN
-                              "error sending event! return code %d\n",
-                              (int)hvrc);
-                       return;
-               }
-
-               /*
-                * clear the used bit, zero the number of bytes in
-                * this buffer, and move to the next buffer
-                */
-               clear_bit(nextbuf, &pi->used);
-               pi->bufferBytes[nextbuf] = 0;
-               nextbuf = (nextbuf + 1) % VIOCHAR_NUM_BUF;
-       }
-
-       /*
-        * If we have emptied all the buffers, start at 0 again.
-        * this will re-use any allocated buffers
-        */
-       if (pi->used == 0) {
-               pi->curbuf = 0;
-
-               if (pi->overflowMessage)
-                       pi->overflowMessage = 0;
-
-               if (pi->tty) {
-                       tty_wakeup(pi->tty);
-               }
-       }
-
-       vio_free_event_buffer(viomajorsubtype_chario, viochar);
-       spin_unlock_irqrestore(&consolelock, flags);
-}
-
-/*
- * Our internal writer.  Gets called both from the console device and
- * the tty device.  the tty pointer will be NULL if called from the console.
- * Return total number of bytes "written".
- *
- * NOTE: Don't use printk in here because it gets nastily recursive.  hvlog
- * can be used to log to the hypervisor buffer
- */
-static int internal_write(struct port_info *pi, const char *buf, size_t len)
-{
-       HvLpEvent_Rc hvrc;
-       size_t bleft;
-       size_t curlen;
-       const char *curbuf;
-       unsigned long flags;
-       struct viocharlpevent *viochar;
-
-       /*
-        * Write to the hvlog of inbound data are now done prior to
-        * calling internal_write() since internal_write() is only called in
-        * the event that an lp event path is active, which isn't the case for
-        * logging attempts prior to console initialization.
-        *
-        * If there is already data queued for this port, send it prior to
-        * attempting to send any new data.
-        */
-       if (pi->used)
-               send_buffers(pi);
-
-       spin_lock_irqsave(&consolelock, flags);
-
-       viochar = vio_get_event_buffer(viomajorsubtype_chario);
-       if (viochar == NULL) {
-               spin_unlock_irqrestore(&consolelock, flags);
-               hvlog("\n\rviocons: Can't get vio buffer in internal_write().");
-               return -EAGAIN;
-       }
-       initDataEvent(viochar, pi->lp);
-
-       curbuf = buf;
-       bleft = len;
-
-       while ((bleft > 0) && (pi->used == 0) &&
-              ((pi->seq - pi->ack) < VIOCHAR_WINDOW)) {
-               if (bleft > VIOCHAR_MAX_DATA)
-                       curlen = VIOCHAR_MAX_DATA;
-               else
-                       curlen = bleft;
-
-               viochar->event.xCorrelationToken = pi->seq++;
-               memcpy(viochar->data, curbuf, curlen);
-               viochar->len = curlen;
-               viochar->event.xSizeMinus1 =
-                   offsetof(struct viocharlpevent, data) + curlen;
-
-               hvrc = HvCallEvent_signalLpEvent(&viochar->event);
-               if (hvrc) {
-                       hvlog("viocons: error sending event! %d\n", (int)hvrc);
-                       goto out;
-               }
-               curbuf += curlen;
-               bleft -= curlen;
-       }
-
-       /* If we didn't send it all, buffer as much of it as we can. */
-       if (bleft > 0)
-               bleft -= buffer_add(pi, curbuf, bleft);
-out:
-       vio_free_event_buffer(viomajorsubtype_chario, viochar);
-       spin_unlock_irqrestore(&consolelock, flags);
-       return len - bleft;
-}
-
-static struct port_info *get_port_data(struct tty_struct *tty)
-{
-       unsigned long flags;
-       struct port_info *pi;
-
-       spin_lock_irqsave(&consolelock, flags);
-       if (tty) {
-               pi = (struct port_info *)tty->driver_data;
-               if (!pi || viotty_paranoia_check(pi, tty->name,
-                                            "get_port_data")) {
-                       pi = NULL;
-               }
-       } else
-               /*
-                * If this is the console device, use the lp from
-                * the first port entry
-                */
-               pi = &port_info[0];
-       spin_unlock_irqrestore(&consolelock, flags);
-       return pi;
-}
-
-/*
- * Initialize the common fields in a charLpEvent
- */
-static void initDataEvent(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);
-}
-
-/*
- * early console device write
- */
-static void viocons_write_early(struct console *co, const char *s, unsigned count)
-{
-       hvlogOutput(s, count);
-}
-
-/*
- * console device write
- */
-static void viocons_write(struct console *co, const char *s, unsigned count)
-{
-       int index;
-       int begin;
-       struct port_info *pi;
-
-       static const char cr = '\r';
-
-       /*
-        * Check port data first because the target LP might be valid but
-        * simply not active, in which case we want to hvlog the output.
-        */
-       pi = get_port_data(NULL);
-       if (pi == NULL) {
-               hvlog("\n\rviocons_write: unable to get port data.");
-               return;
-       }
-
-       hvlogOutput(s, count);
-
-       if (!viopath_isactive(pi->lp))
-               return;
-
-       /* 
-        * Any newline character found will cause a
-        * carriage return character to be emitted as well. 
-        */
-       begin = 0;
-       for (index = 0; index < count; index++) {
-               if (s[index] == '\n') {
-                       /* 
-                        * Newline found. Print everything up to and 
-                        * including the newline
-                        */
-                       internal_write(pi, &s[begin], index - begin + 1);
-                       begin = index + 1;
-                       /* Emit a carriage return as well */
-                       internal_write(pi, &cr, 1);
-               }
-       }
-
-       /* If any characters left to write, write them now */
-       if ((index - begin) > 0)
-               internal_write(pi, &s[begin], index - begin);
-}
-
-/*
- * Work out the device associate with this console
- */
-static struct tty_driver *viocons_device(struct console *c, int *index)
-{
-       *index = c->index;
-       return viotty_driver;
-}
-
-/*
- * console device I/O methods
- */
-static struct console viocons_early = {
-       .name = "viocons",
-       .write = viocons_write_early,
-       .flags = CON_PRINTBUFFER,
-       .index = -1,
-};
-
-static struct console viocons = {
-       .name = "viocons",
-       .write = viocons_write,
-       .device = viocons_device,
-       .flags = CON_PRINTBUFFER,
-       .index = -1,
-};
-
-/*
- * TTY Open method
- */
-static int viotty_open(struct tty_struct *tty, struct file *filp)
-{
-       int port;
-       unsigned long flags;
-       struct port_info *pi;
-
-       port = tty->index;
-
-       if ((port < 0) || (port >= VTTY_PORTS))
-               return -ENODEV;
-
-       spin_lock_irqsave(&consolelock, flags);
-
-       pi = &port_info[port];
-       /* If some other TTY is already connected here, reject the open */
-       if ((pi->tty) && (pi->tty != tty)) {
-               spin_unlock_irqrestore(&consolelock, flags);
-               printk(VIOCONS_KERN_WARN
-                      "attempt to open device twice from different ttys\n");
-               return -EBUSY;
-       }
-       tty->driver_data = pi;
-       pi->tty = tty;
-       spin_unlock_irqrestore(&consolelock, flags);
-
-       return 0;
-}
-
-/*
- * TTY Close method
- */
-static void viotty_close(struct tty_struct *tty, struct file *filp)
-{
-       unsigned long flags;
-       struct port_info *pi;
-
-       spin_lock_irqsave(&consolelock, flags);
-       pi = (struct port_info *)tty->driver_data;
-
-       if (!pi || viotty_paranoia_check(pi, tty->name, "viotty_close")) {
-               spin_unlock_irqrestore(&consolelock, flags);
-               return;
-       }
-       if (tty->count == 1)
-               pi->tty = NULL;
-       spin_unlock_irqrestore(&consolelock, flags);
-}
-
-/*
- * TTY Write method
- */
-static int viotty_write(struct tty_struct *tty, const unsigned char *buf,
-               int count)
-{
-       struct port_info *pi;
-
-       pi = get_port_data(tty);
-       if (pi == NULL) {
-               hvlog("\n\rviotty_write: no port data.");
-               return -ENODEV;
-       }
-
-       if (viochar_is_console(pi))
-               hvlogOutput(buf, count);
-
-       /*
-        * If the path to this LP is closed, don't bother doing anything more.
-        * just dump the data on the floor and return count.  For some reason
-        * some user level programs will attempt to probe available tty's and
-        * they'll attempt a viotty_write on an invalid port which maps to an
-        * invalid target lp.  If this is the case then ignore the
-        * viotty_write call and, since the viopath isn't active to this
-        * partition, return count.
-        */
-       if (!viopath_isactive(pi->lp))
-               return count;
-
-       return internal_write(pi, buf, count);
-}
-
-/*
- * TTY put_char method
- */
-static int viotty_put_char(struct tty_struct *tty, unsigned char ch)
-{
-       struct port_info *pi;
-
-       pi = get_port_data(tty);
-       if (pi == NULL)
-               return 0;
-
-       /* This will append '\r' as well if the char is '\n' */
-       if (viochar_is_console(pi))
-               hvlogOutput(&ch, 1);
-
-       if (viopath_isactive(pi->lp))
-               internal_write(pi, &ch, 1);
-       return 1;
-}
-
-/*
- * TTY write_room method
- */
-static int viotty_write_room(struct tty_struct *tty)
-{
-       int i;
-       int room = 0;
-       struct port_info *pi;
-       unsigned long flags;
-
-       spin_lock_irqsave(&consolelock, flags);
-       pi = (struct port_info *)tty->driver_data;
-       if (!pi || viotty_paranoia_check(pi, tty->name, "viotty_write_room")) {
-               spin_unlock_irqrestore(&consolelock, flags);
-               return 0;
-       }
-
-       /* If no buffers are used, return the max size. */
-       if (pi->used == 0) {
-               spin_unlock_irqrestore(&consolelock, flags);
-               return VIOCHAR_MAX_DATA * VIOCHAR_NUM_BUF;
-       }
-
-       /*
-        * We retain the spinlock because we want to get an accurate
-        * count and it can change on us between each operation if we
-        * don't hold the spinlock.
-        */
-       for (i = 0; ((i < VIOCHAR_NUM_BUF) && (room < VIOCHAR_MAX_DATA)); i++)
-               room += (VIOCHAR_MAX_DATA - pi->bufferBytes[i]);
-       spin_unlock_irqrestore(&consolelock, flags);
-
-       if (room > VIOCHAR_MAX_DATA)
-               room = VIOCHAR_MAX_DATA;
-       return room;
-}
-
-/*
- * TTY chars_in_buffer method
- */
-static int viotty_chars_in_buffer(struct tty_struct *tty)
-{
-       return 0;
-}
-
-static int viotty_ioctl(struct tty_struct *tty, struct file *file,
-                       unsigned int cmd, unsigned long arg)
-{
-       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 KDGETLED:
-       case KDGKBLED:
-               return put_user(0, (char *)arg);
-
-       case KDSKBLED:
-               return 0;
-       }
-       return -ENOIOCTLCMD;
-}
-
-/*
- * Handle an open charLpEvent.  Could be either interrupt or ack
- */
-static void vioHandleOpenEvent(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);
-               /* Got the lock, don't cause console output */
-
-               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(VIOCONS_KERN_WARN
-                              "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(VIOCONS_KERN_WARN
-                              "weird...got open ack without atomic\n");
-               return;
-       }
-
-       /* This had better require an ack, otherwise complain */
-       if (!hvlpevent_need_ack(event)) {
-               printk(VIOCONS_KERN_WARN "viocharopen without ack bit!\n");
-               return;
-       }
-
-       spin_lock_irqsave(&consolelock, flags);
-       /* Got the lock, don't cause console output */
-
-       /* 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
-                * a 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;
-                       reject = 0;
-               }
-       }
-
-       spin_unlock_irqrestore(&consolelock, flags);
-
-       if (reject == 1)
-               printk(VIOCONS_KERN_WARN "open rejected: bad virtual tty.\n");
-       else if (reject == 2)
-               printk(VIOCONS_KERN_WARN
-                       "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.
- *
- * Regardless of the number of connections masqueraded on the other side of
- * the hypervisor ONLY ONE close event should be called to accompany the ONE
- * open event that is called.  The close event should ONLY be called when NO
- * MORE connections (masqueraded or not) exist on the other side of the
- * hypervisor.
- */
-static void vioHandleCloseEvent(struct HvLpEvent *event)
-{
-       unsigned long flags;
-       struct viocharlpevent *cevent = (struct viocharlpevent *)event;
-       u8 port = cevent->virtual_device;
-
-       if (hvlpevent_is_int(event)) {
-               if (port >= VTTY_PORTS) {
-                       printk(VIOCONS_KERN_WARN
-                                       "close message from invalid virtual device.\n");
-                       return;
-               }
-
-               /* For closes, just mark the console partition invalid */
-               spin_lock_irqsave(&consolelock, flags);
-               /* Got the lock, don't cause console output */
-
-               if (port_info[port].lp == event->xSourceLp)
-                       port_info[port].lp = HvLpIndexInvalid;
-
-               spin_unlock_irqrestore(&consolelock, flags);
-               printk(VIOCONS_KERN_INFO "close from %d\n", event->xSourceLp);
-       } else
-               printk(VIOCONS_KERN_WARN
-                               "got unexpected close acknowlegement\n");
-}
-
-/*
- * Handle a config charLpEvent.  Could be either interrupt or ack
- */
-static void vioHandleConfig(struct HvLpEvent *event)
-{
-       struct viocharlpevent *cevent = (struct viocharlpevent *)event;
-
-       HvCall_writeLogBuffer(cevent->data, cevent->len);
-
-       if (cevent->data[0] == 0x01)
-               printk(VIOCONS_KERN_INFO "window resized to %d: %d: %d: %d\n",
-                      cevent->data[1], cevent->data[2],
-                      cevent->data[3], cevent->data[4]);
-       else
-               printk(VIOCONS_KERN_WARN "unknown config event\n");
-}
-
-/*
- * Handle a data charLpEvent. 
- */
-static void vioHandleData(struct HvLpEvent *event)
-{
-       struct tty_struct *tty;
-       unsigned long flags;
-       struct viocharlpevent *cevent = (struct viocharlpevent *)event;
-       struct port_info *pi;
-       int index;
-       int num_pushed;
-       u8 port = cevent->virtual_device;
-
-       if (port >= VTTY_PORTS) {
-               printk(VIOCONS_KERN_WARN "data on invalid virtual device %d\n",
-                               port);
-               return;
-       }
-
-       /*
-        * Hold the spinlock so that we don't take an interrupt that
-        * changes tty between the time we fetch the port_info
-        * pointer and the time we paranoia check.
-        */
-       spin_lock_irqsave(&consolelock, flags);
-       pi = &port_info[port];
-
-       /*
-        * 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.
-        */
-       if (pi->lp != event->xSourceLp) {
-               spin_unlock_irqrestore(&consolelock, flags);
-               return;
-       }
-
-       tty = pi->tty;
-       if (tty == NULL) {
-               spin_unlock_irqrestore(&consolelock, flags);
-               printk(VIOCONS_KERN_WARN "no tty for virtual device %d\n",
-                               port);
-               return;
-       }
-
-       if (tty->magic != TTY_MAGIC) {
-               spin_unlock_irqrestore(&consolelock, flags);
-               printk(VIOCONS_KERN_WARN "tty bad magic\n");
-               return;
-       }
-
-       /*
-        * Just to be paranoid, make sure the tty points back to this port
-        */
-       pi = (struct port_info *)tty->driver_data;
-       if (!pi || viotty_paranoia_check(pi, tty->name, "vioHandleData")) {
-               spin_unlock_irqrestore(&consolelock, flags);
-               return;
-       }
-       spin_unlock_irqrestore(&consolelock, flags);
-
-       /*
-        * Change 07/21/2003 - Ryan Arnold: functionality added to
-        * support sysrq utilizing ^O as the sysrq key.  The sysrq
-        * functionality will only work if built into the kernel and
-        * then only if sysrq is enabled through the proc filesystem.
-        */
-       num_pushed = 0;
-       for (index = 0; index < cevent->len; index++) {
-               /*
-                * Will be optimized away if !CONFIG_MAGIC_SYSRQ:
-                */
-               if (sysrq_on()) {
-                       /* 0x0f is the ascii character for ^O */
-                       if (cevent->data[index] == '\x0f') {
-                               vio_sysrq_pressed = 1;
-                               /*
-                                * continue because we don't want to add
-                                * the sysrq key into the data string.
-                                */
-                               continue;
-                       } else if (vio_sysrq_pressed) {
-                               handle_sysrq(cevent->data[index], tty);
-                               vio_sysrq_pressed = 0;
-                               /*
-                                * continue because we don't want to add
-                                * the sysrq sequence into the data string.
-                                */
-                               continue;
-                       }
-               }
-               /*
-                * The sysrq sequence isn't included in this check if
-                * sysrq is enabled and compiled into the kernel because
-                * the sequence will never get inserted into the buffer.
-                * Don't attempt to copy more data into the buffer than we
-                * have room for because it would fail without indication.
-                */
-               if(tty_insert_flip_char(tty, cevent->data[index], TTY_NORMAL) == 0) {
-                       printk(VIOCONS_KERN_WARN "input buffer overflow!\n");
-                       break;
-               }
-               num_pushed++;
-       }
-
-       if (num_pushed)
-               tty_flip_buffer_push(tty);
-}
-
-/*
- * Handle an ack charLpEvent. 
- */
-static void vioHandleAck(struct HvLpEvent *event)
-{
-       struct viocharlpevent *cevent = (struct viocharlpevent *)event;
-       unsigned long flags;
-       u8 port = cevent->virtual_device;
-
-       if (port >= VTTY_PORTS) {
-               printk(VIOCONS_KERN_WARN "data on invalid virtual device\n");
-               return;
-       }
-
-       spin_lock_irqsave(&consolelock, flags);
-       port_info[port].ack = event->xCorrelationToken;
-       spin_unlock_irqrestore(&consolelock, flags);
-
-       if (port_info[port].used)
-               send_buffers(&port_info[port]);
-}
-
-/*
- * Handle charLpEvents and route to the appropriate routine
- */
-static void vioHandleCharEvent(struct HvLpEvent *event)
-{
-       int charminor;
-
-       if (event == NULL)
-               return;
-
-       charminor = event->xSubtype & VIOMINOR_SUBTYPE_MASK;
-       switch (charminor) {
-       case viocharopen:
-               vioHandleOpenEvent(event);
-               break;
-       case viocharclose:
-               vioHandleCloseEvent(event);
-               break;
-       case viochardata:
-               vioHandleData(event);
-               break;
-       case viocharack:
-               vioHandleAck(event);
-               break;
-       case viocharconfig:
-               vioHandleConfig(event);
-               break;
-       default:
-               if (hvlpevent_is_int(event) && hvlpevent_need_ack(event)) {
-                       event->xRc = HvLpEvent_Rc_InvalidSubtype;
-                       HvCallEvent_ackLpEvent(event);
-               }
-       }
-}
-
-/*
- * Send an open event
- */
-static int 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 const struct tty_operations serial_ops = {
-       .open = viotty_open,
-       .close = viotty_close,
-       .write = viotty_write,
-       .put_char = viotty_put_char,
-       .write_room = viotty_write_room,
-       .chars_in_buffer = viotty_chars_in_buffer,
-       .ioctl = viotty_ioctl,
-};
-
-static int __init viocons_init2(void)
-{
-       atomic_t wait_flag;
-       int rc;
-
-       if (!firmware_has_feature(FW_FEATURE_ISERIES))
-               return -ENODEV;
-
-       /* +2 for fudge */
-       rc = viopath_open(HvLpConfig_getPrimaryLpIndex(),
-                       viomajorsubtype_chario, VIOCHAR_WINDOW + 2);
-       if (rc)
-               printk(VIOCONS_KERN_WARN "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(VIOCONS_KERN_INFO "open path to hosting (%d)\n",
-                               viopath_hostLp);
-               rc = viopath_open(viopath_hostLp, viomajorsubtype_chario,
-                               VIOCHAR_WINDOW + 2);    /* +2 for fudge */
-               if (rc)
-                       printk(VIOCONS_KERN_WARN
-                               "error opening to partition %d: %d\n",
-                               viopath_hostLp, rc);
-       }
-
-       if (vio_setHandler(viomajorsubtype_chario, vioHandleCharEvent) < 0)
-               printk(VIOCONS_KERN_WARN
-                               "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, (void *)&wait_flag) == 0)) {
-               printk(VIOCONS_KERN_INFO "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(), (void *)&wait_flag)
-            == 0)) {
-               printk(VIOCONS_KERN_INFO "opening console to primary partition\n");
-               while (atomic_read(&wait_flag) == 0)
-                       mb();
-       }
-
-       /* Initialize the tty_driver structure */
-       viotty_driver = alloc_tty_driver(VTTY_PORTS);
-       viotty_driver->owner = THIS_MODULE;
-       viotty_driver->driver_name = "vioconsole";
-       viotty_driver->name = "tty";
-       viotty_driver->name_base = 1;
-       viotty_driver->major = TTY_MAJOR;
-       viotty_driver->minor_start = 1;
-       viotty_driver->type = TTY_DRIVER_TYPE_CONSOLE;
-       viotty_driver->subtype = 1;
-       viotty_driver->init_termios = tty_std_termios;
-       viotty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
-       tty_set_operations(viotty_driver, &serial_ops);
-
-       if (tty_register_driver(viotty_driver)) {
-               printk(VIOCONS_KERN_WARN "couldn't register console driver\n");
-               put_tty_driver(viotty_driver);
-               viotty_driver = NULL;
-       }
-
-       unregister_console(&viocons_early);
-       register_console(&viocons);
-
-       return 0;
-}
-
-static int __init viocons_init(void)
-{
-       int i;
-
-       if (!firmware_has_feature(FW_FEATURE_ISERIES))
-               return -ENODEV;
-
-       printk(VIOCONS_KERN_INFO "registering console\n");
-       for (i = 0; i < VTTY_PORTS; i++) {
-               port_info[i].lp = HvLpIndexInvalid;
-               port_info[i].magic = VIOTTY_MAGIC;
-       }
-       HvCall_setLogBufferFormatAndCodepage(HvCall_LogBuffer_ASCII, 437);
-       add_preferred_console("viocons", 0, NULL);
-       register_console(&viocons_early);
-       return 0;
-}
-
-console_initcall(viocons_init);
-module_init(viocons_init2);