diff mbox series

[12/15] tty: hvc: hvc_poll may sleep

Message ID 20180430145558.4308-13-npiggin@gmail.com (mailing list archive)
State Accepted
Commit cfb5946b55f1dfd19e042feae1fbff6041e25a98
Headers show
Series hvc and powerpc opal console latency reduction | expand

Commit Message

Nicholas Piggin April 30, 2018, 2:55 p.m. UTC 
Introduce points where hvc_poll drops the lock, enables interrupts,
and reschedules.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 drivers/tty/hvc/hvc_console.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

Comments

Michael Ellerman Aug. 13, 2018, 11:23 a.m. UTC | #1 
On Mon, 2018-04-30 at 14:55:55 UTC, Nicholas Piggin wrote:
> Introduce points where hvc_poll drops the lock, enables interrupts,
> and reschedules.
> 
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/cfb5946b55f1dfd19e042feae1fbff

cheers
diff mbox series

Patch

diff --git a/drivers/tty/hvc/hvc_console.c b/drivers/tty/hvc/hvc_console.c
index 745ac220fce8..2abfc0b15fbb 100644
--- a/drivers/tty/hvc/hvc_console.c
+++ b/drivers/tty/hvc/hvc_console.c
@@ -589,7 +589,7 @@  static u32 timeout = MIN_TIMEOUT;
 #define HVC_POLL_READ	0x00000001
 #define HVC_POLL_WRITE	0x00000002
 
-int hvc_poll(struct hvc_struct *hp)
+static int __hvc_poll(struct hvc_struct *hp, bool may_sleep)
 {
 	struct tty_struct *tty;
 	int i, n, count, poll_mask = 0;
@@ -611,6 +611,12 @@  int hvc_poll(struct hvc_struct *hp)
 		timeout = (written_total) ? 0 : MIN_TIMEOUT;
 	}
 
+	if (may_sleep) {
+		spin_unlock_irqrestore(&hp->lock, flags);
+		cond_resched();
+		spin_lock_irqsave(&hp->lock, flags);
+	}
+
 	/* No tty attached, just skip */
 	tty = tty_port_tty_get(&hp->port);
 	if (tty == NULL)
@@ -698,6 +704,11 @@  int hvc_poll(struct hvc_struct *hp)
 
 	return poll_mask;
 }
+
+int hvc_poll(struct hvc_struct *hp)
+{
+	return __hvc_poll(hp, false);
+}
 EXPORT_SYMBOL_GPL(hvc_poll);
 
 /**
@@ -736,7 +747,8 @@  static int khvcd(void *unused)
 		if (!cpus_are_in_xmon()) {
 			mutex_lock(&hvc_structs_mutex);
 			list_for_each_entry(hp, &hvc_structs, next) {
-				poll_mask |= hvc_poll(hp);
+				poll_mask |= __hvc_poll(hp, true);
+				cond_resched();
 			}
 			mutex_unlock(&hvc_structs_mutex);
 		} else