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path: root/drivers/tty/hvc/hvsi.c
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Diffstat (limited to 'drivers/tty/hvc/hvsi.c')
-rw-r--r--drivers/tty/hvc/hvsi.c128
1 files changed, 54 insertions, 74 deletions
diff --git a/drivers/tty/hvc/hvsi.c b/drivers/tty/hvc/hvsi.c
index a7488b748647..6f5bc49c441f 100644
--- a/drivers/tty/hvc/hvsi.c
+++ b/drivers/tty/hvc/hvsi.c
@@ -69,14 +69,13 @@
#define __ALIGNED__ __attribute__((__aligned__(sizeof(long))))
struct hvsi_struct {
+ struct tty_port port;
struct delayed_work writer;
struct work_struct handshaker;
wait_queue_head_t emptyq; /* woken when outbuf is emptied */
wait_queue_head_t stateq; /* woken when HVSI state changes */
spinlock_t lock;
int index;
- struct tty_struct *tty;
- int count;
uint8_t throttle_buf[128];
uint8_t outbuf[N_OUTBUF]; /* to implement write_room and chars_in_buffer */
/* inbuf is for packet reassembly. leave a little room for leftovers. */
@@ -237,7 +236,7 @@ static int hvsi_read(struct hvsi_struct *hp, char *buf, int count)
}
static void hvsi_recv_control(struct hvsi_struct *hp, uint8_t *packet,
- struct tty_struct **to_hangup, struct hvsi_struct **to_handshake)
+ struct tty_struct *tty, struct hvsi_struct **to_handshake)
{
struct hvsi_control *header = (struct hvsi_control *)packet;
@@ -247,9 +246,8 @@ static void hvsi_recv_control(struct hvsi_struct *hp, uint8_t *packet,
/* CD went away; no more connection */
pr_debug("hvsi%i: CD dropped\n", hp->index);
hp->mctrl &= TIOCM_CD;
- /* If userland hasn't done an open(2) yet, hp->tty is NULL. */
- if (hp->tty && !(hp->tty->flags & CLOCAL))
- *to_hangup = hp->tty;
+ if (tty && !C_CLOCAL(tty))
+ tty_hangup(tty);
}
break;
case VSV_CLOSE_PROTOCOL:
@@ -331,7 +329,8 @@ static void hvsi_recv_query(struct hvsi_struct *hp, uint8_t *packet)
}
}
-static void hvsi_insert_chars(struct hvsi_struct *hp, const char *buf, int len)
+static void hvsi_insert_chars(struct hvsi_struct *hp, struct tty_struct *tty,
+ const char *buf, int len)
{
int i;
@@ -347,7 +346,7 @@ static void hvsi_insert_chars(struct hvsi_struct *hp, const char *buf, int len)
continue;
}
#endif /* CONFIG_MAGIC_SYSRQ */
- tty_insert_flip_char(hp->tty, c, 0);
+ tty_insert_flip_char(tty, c, 0);
}
}
@@ -360,7 +359,7 @@ static void hvsi_insert_chars(struct hvsi_struct *hp, const char *buf, int len)
* revisited.
*/
#define TTY_THRESHOLD_THROTTLE 128
-static struct tty_struct *hvsi_recv_data(struct hvsi_struct *hp,
+static bool hvsi_recv_data(struct hvsi_struct *hp, struct tty_struct *tty,
const uint8_t *packet)
{
const struct hvsi_header *header = (const struct hvsi_header *)packet;
@@ -371,14 +370,14 @@ static struct tty_struct *hvsi_recv_data(struct hvsi_struct *hp,
pr_debug("queueing %i chars '%.*s'\n", datalen, datalen, data);
if (datalen == 0)
- return NULL;
+ return false;
if (overflow > 0) {
pr_debug("%s: got >TTY_THRESHOLD_THROTTLE bytes\n", __func__);
datalen = TTY_THRESHOLD_THROTTLE;
}
- hvsi_insert_chars(hp, data, datalen);
+ hvsi_insert_chars(hp, tty, data, datalen);
if (overflow > 0) {
/*
@@ -390,7 +389,7 @@ static struct tty_struct *hvsi_recv_data(struct hvsi_struct *hp,
hp->n_throttle = overflow;
}
- return hp->tty;
+ return true;
}
/*
@@ -399,14 +398,13 @@ static struct tty_struct *hvsi_recv_data(struct hvsi_struct *hp,
* machine during console handshaking (in which case tty = NULL and we ignore
* incoming data).
*/
-static int hvsi_load_chunk(struct hvsi_struct *hp, struct tty_struct **flip,
- struct tty_struct **hangup, struct hvsi_struct **handshake)
+static int hvsi_load_chunk(struct hvsi_struct *hp, struct tty_struct *tty,
+ struct hvsi_struct **handshake)
{
uint8_t *packet = hp->inbuf;
int chunklen;
+ bool flip = false;
- *flip = NULL;
- *hangup = NULL;
*handshake = NULL;
chunklen = hvsi_read(hp, hp->inbuf_end, HVSI_MAX_READ);
@@ -440,12 +438,12 @@ static int hvsi_load_chunk(struct hvsi_struct *hp, struct tty_struct **flip,
case VS_DATA_PACKET_HEADER:
if (!is_open(hp))
break;
- if (hp->tty == NULL)
+ if (tty == NULL)
break; /* no tty buffer to put data in */
- *flip = hvsi_recv_data(hp, packet);
+ flip = hvsi_recv_data(hp, tty, packet);
break;
case VS_CONTROL_PACKET_HEADER:
- hvsi_recv_control(hp, packet, hangup, handshake);
+ hvsi_recv_control(hp, packet, tty, handshake);
break;
case VS_QUERY_RESPONSE_PACKET_HEADER:
hvsi_recv_response(hp, packet);
@@ -462,28 +460,26 @@ static int hvsi_load_chunk(struct hvsi_struct *hp, struct tty_struct **flip,
packet += len_packet(packet);
- if (*hangup || *handshake) {
- pr_debug("%s: hangup or handshake\n", __func__);
- /*
- * we need to send the hangup now before receiving any more data.
- * If we get "data, hangup, data", we can't deliver the second
- * data before the hangup.
- */
+ if (*handshake) {
+ pr_debug("%s: handshake\n", __func__);
break;
}
}
compact_inbuf(hp, packet);
+ if (flip)
+ tty_flip_buffer_push(tty);
+
return 1;
}
-static void hvsi_send_overflow(struct hvsi_struct *hp)
+static void hvsi_send_overflow(struct hvsi_struct *hp, struct tty_struct *tty)
{
pr_debug("%s: delivering %i bytes overflow\n", __func__,
hp->n_throttle);
- hvsi_insert_chars(hp, hp->throttle_buf, hp->n_throttle);
+ hvsi_insert_chars(hp, tty, hp->throttle_buf, hp->n_throttle);
hp->n_throttle = 0;
}
@@ -494,35 +490,20 @@ static void hvsi_send_overflow(struct hvsi_struct *hp)
static irqreturn_t hvsi_interrupt(int irq, void *arg)
{
struct hvsi_struct *hp = (struct hvsi_struct *)arg;
- struct tty_struct *flip;
- struct tty_struct *hangup;
struct hvsi_struct *handshake;
+ struct tty_struct *tty;
unsigned long flags;
int again = 1;
pr_debug("%s\n", __func__);
+ tty = tty_port_tty_get(&hp->port);
+
while (again) {
spin_lock_irqsave(&hp->lock, flags);
- again = hvsi_load_chunk(hp, &flip, &hangup, &handshake);
+ again = hvsi_load_chunk(hp, tty, &handshake);
spin_unlock_irqrestore(&hp->lock, flags);
- /*
- * we have to call tty_flip_buffer_push() and tty_hangup() outside our
- * spinlock. But we also have to keep going until we've read all the
- * available data.
- */
-
- if (flip) {
- /* there was data put in the tty flip buffer */
- tty_flip_buffer_push(flip);
- flip = NULL;
- }
-
- if (hangup) {
- tty_hangup(hangup);
- }
-
if (handshake) {
pr_debug("hvsi%i: attempting re-handshake\n", handshake->index);
schedule_work(&handshake->handshaker);
@@ -530,18 +511,15 @@ static irqreturn_t hvsi_interrupt(int irq, void *arg)
}
spin_lock_irqsave(&hp->lock, flags);
- if (hp->tty && hp->n_throttle
- && (!test_bit(TTY_THROTTLED, &hp->tty->flags))) {
- /* we weren't hung up and we weren't throttled, so we can deliver the
- * rest now */
- flip = hp->tty;
- hvsi_send_overflow(hp);
+ if (tty && hp->n_throttle && !test_bit(TTY_THROTTLED, &tty->flags)) {
+ /* we weren't hung up and we weren't throttled, so we can
+ * deliver the rest now */
+ hvsi_send_overflow(hp, tty);
+ tty_flip_buffer_push(tty);
}
spin_unlock_irqrestore(&hp->lock, flags);
- if (flip) {
- tty_flip_buffer_push(flip);
- }
+ tty_kref_put(tty);
return IRQ_HANDLED;
}
@@ -749,9 +727,9 @@ static int hvsi_open(struct tty_struct *tty, struct file *filp)
if (hp->state == HVSI_FSP_DIED)
return -EIO;
+ tty_port_tty_set(&hp->port, tty);
spin_lock_irqsave(&hp->lock, flags);
- hp->tty = tty;
- hp->count++;
+ hp->port.count++;
atomic_set(&hp->seqno, 0);
h_vio_signal(hp->vtermno, VIO_IRQ_ENABLE);
spin_unlock_irqrestore(&hp->lock, flags);
@@ -808,8 +786,8 @@ static void hvsi_close(struct tty_struct *tty, struct file *filp)
spin_lock_irqsave(&hp->lock, flags);
- if (--hp->count == 0) {
- hp->tty = NULL;
+ if (--hp->port.count == 0) {
+ tty_port_tty_set(&hp->port, NULL);
hp->inbuf_end = hp->inbuf; /* discard remaining partial packets */
/* only close down connection if it is not the console */
@@ -841,9 +819,9 @@ static void hvsi_close(struct tty_struct *tty, struct file *filp)
spin_lock_irqsave(&hp->lock, flags);
}
- } else if (hp->count < 0)
+ } else if (hp->port.count < 0)
printk(KERN_ERR "hvsi_close %lu: oops, count is %d\n",
- hp - hvsi_ports, hp->count);
+ hp - hvsi_ports, hp->port.count);
spin_unlock_irqrestore(&hp->lock, flags);
}
@@ -855,12 +833,11 @@ static void hvsi_hangup(struct tty_struct *tty)
pr_debug("%s\n", __func__);
- spin_lock_irqsave(&hp->lock, flags);
+ tty_port_tty_set(&hp->port, NULL);
- hp->count = 0;
+ spin_lock_irqsave(&hp->lock, flags);
+ hp->port.count = 0;
hp->n_outbuf = 0;
- hp->tty = NULL;
-
spin_unlock_irqrestore(&hp->lock, flags);
}
@@ -888,6 +865,7 @@ static void hvsi_write_worker(struct work_struct *work)
{
struct hvsi_struct *hp =
container_of(work, struct hvsi_struct, writer.work);
+ struct tty_struct *tty;
unsigned long flags;
#ifdef DEBUG
static long start_j = 0;
@@ -921,7 +899,11 @@ static void hvsi_write_worker(struct work_struct *work)
start_j = 0;
#endif /* DEBUG */
wake_up_all(&hp->emptyq);
- tty_wakeup(hp->tty);
+ tty = tty_port_tty_get(&hp->port);
+ if (tty) {
+ tty_wakeup(tty);
+ tty_kref_put(tty);
+ }
}
out:
@@ -966,8 +948,8 @@ static int hvsi_write(struct tty_struct *tty,
* and hvsi_write_worker will be scheduled. subsequent hvsi_write() calls
* will see there is no room in outbuf and return.
*/
- while ((count > 0) && (hvsi_write_room(hp->tty) > 0)) {
- int chunksize = min(count, hvsi_write_room(hp->tty));
+ while ((count > 0) && (hvsi_write_room(tty) > 0)) {
+ int chunksize = min(count, hvsi_write_room(tty));
BUG_ON(hp->n_outbuf < 0);
memcpy(hp->outbuf + hp->n_outbuf, source, chunksize);
@@ -1014,19 +996,16 @@ static void hvsi_unthrottle(struct tty_struct *tty)
{
struct hvsi_struct *hp = tty->driver_data;
unsigned long flags;
- int shouldflip = 0;
pr_debug("%s\n", __func__);
spin_lock_irqsave(&hp->lock, flags);
if (hp->n_throttle) {
- hvsi_send_overflow(hp);
- shouldflip = 1;
+ hvsi_send_overflow(hp, tty);
+ tty_flip_buffer_push(tty);
}
spin_unlock_irqrestore(&hp->lock, flags);
- if (shouldflip)
- tty_flip_buffer_push(hp->tty);
h_vio_signal(hp->vtermno, VIO_IRQ_ENABLE);
}
@@ -1228,6 +1207,7 @@ static int __init hvsi_console_init(void)
init_waitqueue_head(&hp->emptyq);
init_waitqueue_head(&hp->stateq);
spin_lock_init(&hp->lock);
+ tty_port_init(&hp->port);
hp->index = hvsi_count;
hp->inbuf_end = hp->inbuf;
hp->state = HVSI_CLOSED;