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| author | Nicholas Piggin <npiggin@gmail.com> | 2018-05-01 00:55:57 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-07-23 20:13:20 +1000 |
| commit | 9f65b81f36e31563c5a5e4df3b3b8bc7550b6030 (patch) | |
| tree | a4e3e295eba020c1f68072d40733cdb57f543e84 /drivers/tty/hvc/hvc_console.h | |
| parent | 550ddadcc7580ec2a6c22d4ed04291bc6e2428fb (diff) | |
| download | op-kernel-dev-9f65b81f36e31563c5a5e4df3b3b8bc7550b6030.zip op-kernel-dev-9f65b81f36e31563c5a5e4df3b3b8bc7550b6030.tar.gz | |
tty: hvc: introduce the hv_ops.flush operation for hvc drivers
Use .flush to wait for drivers to flush their console outside of
the spinlock, to reduce lock/irq latencies.
Flush the hvc console driver after each write, which can help
messages make it out to the console after a crash.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/tty/hvc/hvc_console.h')
| -rw-r--r-- | drivers/tty/hvc/hvc_console.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/tty/hvc/hvc_console.h b/drivers/tty/hvc/hvc_console.h index ea63090..e931995 100644 --- a/drivers/tty/hvc/hvc_console.h +++ b/drivers/tty/hvc/hvc_console.h @@ -54,6 +54,7 @@ struct hvc_struct { struct hv_ops { int (*get_chars)(uint32_t vtermno, char *buf, int count); int (*put_chars)(uint32_t vtermno, const char *buf, int count); + int (*flush)(uint32_t vtermno, bool wait); /* Callbacks for notification. Called in open, close and hangup */ int (*notifier_add)(struct hvc_struct *hp, int irq); |
