Re: [14/15] tty: hvc: introduce the hv_ops.flush operation for hvc drivers

[PATCH 00/15] hvc and powerpc opal console latency reduction · Nicholas Piggin <npiggin@gmail.com> · 2018-04-30
[PATCH 01/15] powerpc/powernv: opal_put_chars partial write fix · Nicholas Piggin <npiggin@gmail.com> · 2018-04-30
Re: [01/15] powerpc/powernv: opal_put_chars partial write fix · Michael Ellerman <hidden> · 2018-07-24
[PATCH 02/15] powerpc/powernv: Fix OPAL console driver OPAL_BUSY loops · Nicholas Piggin <npiggin@gmail.com> · 2018-04-30
[PATCH 03/15] powerpc/powernv: opal-kmsg standardise OPAL_BUSY handling · Nicholas Piggin <npiggin@gmail.com> · 2018-04-30
[PATCH 04/15] powerpc/powernv: opal-kmsg use flush fallback from console code · Nicholas Piggin <npiggin@gmail.com> · 2018-04-30
Re: [PATCH 04/15] powerpc/powernv: opal-kmsg use flush fallback from console code · Michael Ellerman <mpe@ellerman.id.au> · 2018-05-04
Re: [PATCH 04/15] powerpc/powernv: opal-kmsg use flush fallback from console code · Nicholas Piggin <npiggin@gmail.com> · 2018-05-04
Re: [PATCH 04/15] powerpc/powernv: opal-kmsg use flush fallback from console code · Michael Ellerman <mpe@ellerman.id.au> · 2018-05-07
Re: [PATCH 04/15] powerpc/powernv: opal-kmsg use flush fallback from console code · Nicholas Piggin <npiggin@gmail.com> · 2018-05-08
[PATCH 05/15] powerpc/powernv: Implement and use opal_flush_console · Nicholas Piggin <npiggin@gmail.com> · 2018-04-30
[PATCH 06/15] powerpc/powernv: Remove OPALv1 support from opal console driver · Nicholas Piggin <npiggin@gmail.com> · 2018-04-30
[PATCH 07/15] powerpc/powernv: move opal console flushing to udbg · Nicholas Piggin <npiggin@gmail.com> · 2018-04-30
[PATCH 08/15] powerpc/powernv: implement opal_put_chars_atomic · Nicholas Piggin <npiggin@gmail.com> · 2018-04-30
Re: [PATCH 08/15] powerpc/powernv: implement opal_put_chars_atomic · Benjamin Herrenschmidt <benh@kernel.crashing.org> · 2018-05-01
Re: [PATCH 08/15] powerpc/powernv: implement opal_put_chars_atomic · Nicholas Piggin <npiggin@gmail.com> · 2018-05-01
Re: [PATCH 08/15] powerpc/powernv: implement opal_put_chars_atomic · Michael Ellerman <mpe@ellerman.id.au> · 2018-05-07
Re: [PATCH 08/15] powerpc/powernv: implement opal_put_chars_atomic · Nicholas Piggin <npiggin@gmail.com> · 2018-05-08
[PATCH 09/15] tty: hvc: remove unexplained "just in case" spin delay · Nicholas Piggin <npiggin@gmail.com> · 2018-04-30
[PATCH 10/15] tty: hvc: use mutex instead of spinlock for hvc_structs lock · Nicholas Piggin <npiggin@gmail.com> · 2018-04-30
Re: [10/15] tty: hvc: use mutex instead of spinlock for hvc_structs lock · Michael Ellerman <hidden> · 2018-08-13
[PATCH 11/15] tty: hvc: hvc_poll break hv read loop · Nicholas Piggin <npiggin@gmail.com> · 2018-04-30
Re: [11/15] tty: hvc: hvc_poll break hv read loop · Michael Ellerman <hidden> · 2018-08-13
[PATCH 12/15] tty: hvc: hvc_poll may sleep · Nicholas Piggin <npiggin@gmail.com> · 2018-04-30
Re: [12/15] tty: hvc: hvc_poll may sleep · Michael Ellerman <hidden> · 2018-08-13
[PATCH 13/15] tty: hvc: hvc_write may sleep · Nicholas Piggin <npiggin@gmail.com> · 2018-04-30
Re: [13/15] tty: hvc: hvc_write may sleep · Michael Ellerman <hidden> · 2018-08-13
[PATCH 14/15] tty: hvc: introduce the hv_ops.flush operation for hvc drivers · Nicholas Piggin <npiggin@gmail.com> · 2018-04-30
Re: [14/15] tty: hvc: introduce the hv_ops.flush operation for hvc drivers · Michael Ellerman <hidden> · 2018-08-13
[PATCH 15/15] powerpc/powernv: provide a console flush operation for opal hvc driver · Nicholas Piggin <npiggin@gmail.com> · 2018-04-30
Re: [15/15] powerpc/powernv: provide a console flush operation for opal hvc driver · Michael Ellerman <hidden> · 2018-08-21

From: Michael Ellerman <hidden>
Date: 2018-08-13 11:23:09
Also in: lkml

On Mon, 2018-04-30 at 14:55:57 UTC, Nicholas Piggin wrote:

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>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/9f65b81f36e31563c5a5e4df3b3b8b

cheers

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