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Message-Id: <20240820063001.36405-1-john.ogness@linutronix.de>
Date: Tue, 20 Aug 2024 08:35:26 +0206
From: John Ogness <john.ogness@...utronix.de>
To: Petr Mladek <pmladek@...e.com>
Cc: Sergey Senozhatsky <senozhatsky@...omium.org>,
Steven Rostedt <rostedt@...dmis.org>,
Thomas Gleixner <tglx@...utronix.de>,
linux-kernel@...r.kernel.org,
Miguel Ojeda <ojeda@...nel.org>,
"Paul E. McKenney" <paulmck@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jiri Slaby <jirislaby@...nel.org>,
linux-serial@...r.kernel.org,
Russell King <linux@...linux.org.uk>,
Tony Lindgren <tony@...mide.com>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Geert Uytterhoeven <geert+renesas@...der.be>,
Arnd Bergmann <arnd@...db.de>,
Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
Théo Lebrun <theo.lebrun@...tlin.com>,
Linus Walleij <linus.walleij@...aro.org>,
Lino Sanfilippo <l.sanfilippo@...bus.com>,
Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
Konrad Dybcio <konrad.dybcio@...aro.org>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
Andrew Morton <akpm@...ux-foundation.org>,
Jani Nikula <jani.nikula@...el.com>,
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Feng Tang <feng.tang@...el.com>,
Baoquan He <bhe@...hat.com>,
Frederic Weisbecker <frederic@...nel.org>,
Neeraj Upadhyay <neeraj.upadhyay@...nel.org>,
Joel Fernandes <joel@...lfernandes.org>,
Josh Triplett <josh@...htriplett.org>,
Boqun Feng <boqun.feng@...il.com>,
Uladzislau Rezki <urezki@...il.com>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Lai Jiangshan <jiangshanlai@...il.com>,
Zqiang <qiang.zhang1211@...il.com>,
rcu@...r.kernel.org,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Will Deacon <will@...nel.org>,
Waiman Long <longman@...hat.com>
Subject: [PATCH printk v8 00/35] wire up write_atomic() printing
Hi,
This is v8 of a series to wire up the nbcon consoles so that
they actually perform printing using their write_atomic()
callback. v7 is here [0]. For information about the motivation
of the atomic consoles, please read the cover letter of v1 [1].
The main focus of this series:
- For nbcon consoles, always call write_atomic() directly from
printk() caller context for the panic CPU.
- For nbcon consoles, call write_atomic() when unlocking the
console lock.
- Only perform the console lock/unlock dance if legacy or boot
consoles are registered.
- For legacy consoles, if nbcon consoles are registered, do not
attempt to print from printk() caller context for the panic
CPU until nbcon consoles have had a chance to print the most
significant messages.
- Mark emergency sections. In these sections, every printk()
call will attempt to directly flush to the consoles using the
EMERGENCY priority.
This series does _not_ include threaded printing or nbcon
drivers. Those features will be added in separate follow-up
series.
The changes since v7:
- Change printk_get_console_flush_type() to set preferred flush
types.
- Change printk_get_console_flush_type() to also check for
legacy consoles before seting @legacy_direct.
- Change vprintk_emit() to hack the struct console_flush_type
for LOGLEVEL_SCHED rather than using local variables.
- Change console_cpu_notify() to also flush nbcon atomic
consoles.
- Remove unnecessary flush type check in
nbcon_atomic_flush_pending_con(). It is not needed until the
threaded series.
- Fix compiling issues related to @legacy_allow_panic_sync for
!CONFIG_PRINTK.
John Ogness
[0] https://lore.kernel.org/lkml/20240804005138.3722656-1-john.ogness@linutronix.de
[1] https://lore.kernel.org/lkml/20230302195618.156940-1-john.ogness@linutronix.de
John Ogness (30):
printk: Add notation to console_srcu locking
printk: nbcon: Consolidate alloc() and init()
printk: nbcon: Clarify rules of the owner/waiter matching
printk: nbcon: Remove return value for write_atomic()
printk: nbcon: Add detailed doc for write_atomic()
printk: nbcon: Add callbacks to synchronize with driver
printk: nbcon: Use driver synchronization while (un)registering
serial: core: Provide low-level functions to lock port
serial: core: Introduce wrapper to set @uart_port->cons
console: Improve console_srcu_read_flags() comments
nbcon: Add API to acquire context for non-printing operations
serial: core: Acquire nbcon context in port->lock wrapper
printk: nbcon: Do not rely on proxy headers
printk: Make console_is_usable() available to nbcon.c
printk: Let console_is_usable() handle nbcon
printk: Add @flags argument for console_is_usable()
printk: nbcon: Add helper to assign priority based on CPU state
printk: Track registered boot consoles
printk: nbcon: Use nbcon consoles in console_flush_all()
printk: Add is_printk_legacy_deferred()
printk: nbcon: Flush new records on device_release()
printk: Flush nbcon consoles first on panic
printk: nbcon: Add unsafe flushing on panic
printk: Avoid console_lock dance if no legacy or boot consoles
printk: Track nbcon consoles
printk: Coordinate direct printing in panic
printk: Add helper for flush type logic
panic: Mark emergency section in oops
rcu: Mark emergency sections in rcu stalls
lockdep: Mark emergency sections in lockdep splats
Petr Mladek (1):
printk: Properly deal with nbcon consoles on seq init
Sebastian Andrzej Siewior (1):
printk: Check printk_deferred_enter()/_exit() usage
Thomas Gleixner (3):
printk: nbcon: Provide function to flush using write_atomic()
printk: nbcon: Implement emergency sections
panic: Mark emergency section in warn
drivers/tty/serial/8250/8250_core.c | 6 +-
drivers/tty/serial/amba-pl011.c | 2 +-
drivers/tty/serial/serial_core.c | 16 +-
include/linux/console.h | 110 +++++-
include/linux/printk.h | 33 +-
include/linux/serial_core.h | 117 +++++-
kernel/locking/lockdep.c | 83 ++++-
kernel/panic.c | 9 +
kernel/printk/internal.h | 137 ++++++-
kernel/printk/nbcon.c | 556 +++++++++++++++++++++++++---
kernel/printk/printk.c | 251 ++++++++++---
kernel/printk/printk_ringbuffer.h | 2 +
kernel/printk/printk_safe.c | 23 +-
kernel/rcu/tree_exp.h | 7 +
kernel/rcu/tree_stall.h | 9 +
15 files changed, 1210 insertions(+), 151 deletions(-)
base-commit: bcc954c6caba01fca143162d5fbb90e46aa1ad80
--
2.39.2
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