+++ /dev/null
-/* -*- 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);
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff