From: Sumit Garg <sumit.garg@linaro.org>
To: kgdb-bugreport@lists.sourceforge.net, linux-serial@vger.kernel.org
Cc: gregkh@linuxfoundation.org, daniel.thompson@linaro.org,
jason.wessel@windriver.com, dianders@chromium.org,
jslaby@suse.com, linux@armlinux.org.uk,
linux-kernel@vger.kernel.org, Sumit Garg <sumit.garg@linaro.org>
Subject: [PATCH 0/7] Enable support for kgdb NMI console feature
Date: Mon, 22 Jun 2020 19:56:17 +0530 [thread overview]
Message-ID: <1592835984-28613-1-git-send-email-sumit.garg@linaro.org> (raw)
This work is derived from Daniel's prior work here [1]. It has been
rebased (tag: kgdb-5.8-rc1 + console hardening patch-set[2]), reworked
to use serial RX interrupt as NMI (pseudo NMI on aarch64) in order to
drop into debugger and tested on Developerbox (using amba-pl011).
- Patch #1 is more of a fix required for NMI console to replace kgdb IO
console.
- Patches #2 to #6 adds an architecture agnostic fallback mechanism to
enable kgdb NMI console using serial RX interrupt as NMI.
- Patch #7 is an optimization patch that gets rid of inefficient timer
based tasklet and rather uses irq_work.
Usage of kgdb NMI console:
- Enable "CONFIG_SERIAL_KGDB_NMI".
- Kernel cmdline modification for Developerbox:
console=ttyNMI0 kgdboc=ttyAMA0
[1] https://git.linaro.org/people/daniel.thompson/linux.git/log/?h=kgdb/polled_request_irq
[2] https://lkml.org/lkml/2020/6/4/294
Daniel Thompson (5):
tty: serial: Add poll_get_irq() to the polling interface
kgdb: Add request_nmi() to the io ops table for kgdboc
serial: kgdb_nmi: Add support for interrupt based fallback
serial: 8250: Implement poll_get_irq() interface
serial: kgdb_nmi: Replace hrtimer with irq_work ping
Sumit Garg (2):
serial: kgdb_nmi: Allow NMI console to replace kgdb IO console
serial: amba-pl011: Implement poll_get_irq() interface
drivers/tty/serial/8250/8250_port.c | 16 ++++++
drivers/tty/serial/amba-pl011.c | 12 +++++
drivers/tty/serial/kgdb_nmi.c | 100 ++++++++++++++++++++++++------------
drivers/tty/serial/kgdboc.c | 35 +++++++++++++
drivers/tty/serial/serial_core.c | 18 +++++++
include/linux/kgdb.h | 7 +++
include/linux/serial_core.h | 1 +
include/linux/tty_driver.h | 1 +
8 files changed, 158 insertions(+), 32 deletions(-)
--
2.7.4
next reply other threads:[~2020-06-22 14:27 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-22 14:26 Sumit Garg [this message]
2020-06-22 14:26 ` [PATCH 1/7] serial: kgdb_nmi: Allow NMI console to replace kgdb IO console Sumit Garg
2020-06-22 14:26 ` [PATCH 2/7] tty: serial: Add poll_get_irq() to the polling interface Sumit Garg
2020-06-22 15:56 ` Daniel Thompson
2020-06-23 7:48 ` Sumit Garg
2020-06-23 10:52 ` Daniel Thompson
2020-06-22 14:26 ` [PATCH 3/7] kgdb: Add request_nmi() to the io ops table for kgdboc Sumit Garg
2020-06-22 16:03 ` Daniel Thompson
2020-06-23 8:37 ` Sumit Garg
2020-06-23 10:59 ` Daniel Thompson
2020-06-26 19:44 ` Doug Anderson
2020-06-29 11:45 ` Daniel Thompson
2020-06-30 6:09 ` Sumit Garg
2020-06-22 14:26 ` [PATCH 4/7] serial: kgdb_nmi: Add support for interrupt based fallback Sumit Garg
2020-06-22 16:36 ` Daniel Thompson
2020-06-23 9:59 ` Sumit Garg
2020-06-22 14:26 ` [PATCH 5/7] serial: 8250: Implement poll_get_irq() interface Sumit Garg
2020-06-22 14:26 ` [PATCH 6/7] serial: amba-pl011: " Sumit Garg
2020-06-22 14:26 ` [PATCH 7/7] serial: kgdb_nmi: Replace hrtimer with irq_work ping Sumit Garg
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