From: Stephen Boyd <swboyd@chromium.org>
To: Catalin Marinas <catalin.marinas@arm.com>,
Daniel Thompson <daniel.thompson@linaro.org>,
Douglas Anderson <dianders@chromium.org>,
Marc Zyngier <maz@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Sumit Garg <sumit.garg@linaro.org>, Will Deacon <will@kernel.org>
Cc: "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
Ard Biesheuvel <ardb@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
kgdb-bugreport@lists.sourceforge.net,
Lecopzer Chen <lecopzer.chen@mediatek.com>,
linux-perf-users@vger.kernel.org,
Masayoshi Mizuma <msys.mizuma@gmail.com>,
Chen-Yu Tsai <wens@csie.org>,
linux-arm-kernel@lists.infradead.org, ito-yuichi@fujitsu.com,
Peter Zijlstra <peterz@infradead.org>,
D Scott Phillips <scott@os.amperecomputing.com>,
Josh Poimboeuf <jpoimboe@kernel.org>,
Valentin Schneider <vschneid@redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v11 6/6] arm64: kgdb: Implement kgdb_roundup_cpus() to enable pseudo-NMI roundup
Date: Fri, 25 Aug 2023 17:28:23 -0500 [thread overview]
Message-ID: <CAE-0n50sODsofOC-5uhs_1E6aHyTmyK45nPUvFddq9N9jhqUXg@mail.gmail.com> (raw)
In-Reply-To: <20230824083012.v11.6.I2ef26d1b3bfbed2d10a281942b0da7d9854de05e@changeid>
Quoting Douglas Anderson (2023-08-24 08:30:32)
> Up until now we've been using the generic (weak) implementation for
> kgdb_roundup_cpus() when using kgdb on arm64. Let's move to a custom
> one. The advantage here is that, when pseudo-NMI is enabled on a
> device, we'll be able to round up CPUs using pseudo-NMI. This allows
> us to debug CPUs that are stuck with interrupts disabled. If
> pseudo-NMIs are not enabled then we'll fallback to just using an IPI,
> which is still slightly better than the generic implementation since
> it avoids the potential situation described in the generic
> kgdb_call_nmi_hook().
>
> Co-developed-by: Sumit Garg <sumit.garg@linaro.org>
> Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> ---
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
WARNING: multiple messages have this Message-ID (diff)
From: Stephen Boyd <swboyd@chromium.org>
To: Catalin Marinas <catalin.marinas@arm.com>,
Daniel Thompson <daniel.thompson@linaro.org>,
Douglas Anderson <dianders@chromium.org>,
Marc Zyngier <maz@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Sumit Garg <sumit.garg@linaro.org>,
Will Deacon <will@kernel.org>
Cc: "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
Ard Biesheuvel <ardb@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
kgdb-bugreport@lists.sourceforge.net,
Lecopzer Chen <lecopzer.chen@mediatek.com>,
linux-perf-users@vger.kernel.org,
Masayoshi Mizuma <msys.mizuma@gmail.com>,
Chen-Yu Tsai <wens@csie.org>,
linux-arm-kernel@lists.infradead.org, ito-yuichi@fujitsu.com,
Peter Zijlstra <peterz@infradead.org>,
D Scott Phillips <scott@os.amperecomputing.com>,
Josh Poimboeuf <jpoimboe@kernel.org>,
Valentin Schneider <vschneid@redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v11 6/6] arm64: kgdb: Implement kgdb_roundup_cpus() to enable pseudo-NMI roundup
Date: Fri, 25 Aug 2023 17:28:23 -0500 [thread overview]
Message-ID: <CAE-0n50sODsofOC-5uhs_1E6aHyTmyK45nPUvFddq9N9jhqUXg@mail.gmail.com> (raw)
In-Reply-To: <20230824083012.v11.6.I2ef26d1b3bfbed2d10a281942b0da7d9854de05e@changeid>
Quoting Douglas Anderson (2023-08-24 08:30:32)
> Up until now we've been using the generic (weak) implementation for
> kgdb_roundup_cpus() when using kgdb on arm64. Let's move to a custom
> one. The advantage here is that, when pseudo-NMI is enabled on a
> device, we'll be able to round up CPUs using pseudo-NMI. This allows
> us to debug CPUs that are stuck with interrupts disabled. If
> pseudo-NMIs are not enabled then we'll fallback to just using an IPI,
> which is still slightly better than the generic implementation since
> it avoids the potential situation described in the generic
> kgdb_call_nmi_hook().
>
> Co-developed-by: Sumit Garg <sumit.garg@linaro.org>
> Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> ---
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2023-08-25 22:29 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-24 15:30 [PATCH v11 0/6] arm64: Add IPI for backtraces / kgdb; try to use NMI for some IPIs Douglas Anderson
2023-08-24 15:30 ` Douglas Anderson
2023-08-24 15:30 ` [PATCH v11 1/6] irqchip/gic-v3: Enable support for SGIs to act as NMIs Douglas Anderson
2023-08-24 15:30 ` Douglas Anderson
2023-08-26 10:36 ` Marc Zyngier
2023-08-26 10:36 ` Marc Zyngier
2023-08-28 15:35 ` Doug Anderson
2023-08-28 15:35 ` Doug Anderson
2023-08-29 10:36 ` Sumit Garg
2023-08-29 10:36 ` Sumit Garg
2023-08-24 15:30 ` [PATCH v11 2/6] arm64: idle: Tag the arm64 idle functions as __cpuidle Douglas Anderson
2023-08-24 15:30 ` Douglas Anderson
2023-08-29 10:38 ` Sumit Garg
2023-08-29 10:38 ` Sumit Garg
2023-08-24 15:30 ` [PATCH v11 3/6] arm64: smp: Remove dedicated wakeup IPI Douglas Anderson
2023-08-24 15:30 ` Douglas Anderson
2023-08-25 22:17 ` Stephen Boyd
2023-08-25 22:17 ` Stephen Boyd
2023-08-29 10:41 ` Sumit Garg
2023-08-29 10:41 ` Sumit Garg
2023-08-24 15:30 ` [PATCH v11 4/6] arm64: smp: Add arch support for backtrace using pseudo-NMI Douglas Anderson
2023-08-24 15:30 ` Douglas Anderson
2023-08-25 22:27 ` Stephen Boyd
2023-08-25 22:27 ` Stephen Boyd
2023-08-25 23:02 ` Doug Anderson
2023-08-25 23:02 ` Doug Anderson
2023-08-25 23:23 ` Stephen Boyd
2023-08-25 23:23 ` Stephen Boyd
2023-08-29 5:23 ` Tomohiro Misono (Fujitsu)
2023-08-29 5:23 ` Tomohiro Misono (Fujitsu)
2023-08-29 16:03 ` Doug Anderson
2023-08-29 16:03 ` Doug Anderson
2023-08-24 15:30 ` [PATCH v11 5/6] arm64: smp: IPI_CPU_STOP and IPI_CPU_CRASH_STOP should try for NMI Douglas Anderson
2023-08-24 15:30 ` Douglas Anderson
2023-08-29 5:30 ` Tomohiro Misono (Fujitsu)
2023-08-29 5:30 ` Tomohiro Misono (Fujitsu)
2023-08-29 10:42 ` Sumit Garg
2023-08-29 10:42 ` Sumit Garg
2023-08-24 15:30 ` [PATCH v11 6/6] arm64: kgdb: Implement kgdb_roundup_cpus() to enable pseudo-NMI roundup Douglas Anderson
2023-08-24 15:30 ` Douglas Anderson
2023-08-25 11:20 ` Daniel Thompson
2023-08-25 11:20 ` Daniel Thompson
2023-08-25 22:28 ` Stephen Boyd [this message]
2023-08-25 22:28 ` Stephen Boyd
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAE-0n50sODsofOC-5uhs_1E6aHyTmyK45nPUvFddq9N9jhqUXg@mail.gmail.com \
--to=swboyd@chromium.org \
--cc=ardb@kernel.org \
--cc=catalin.marinas@arm.com \
--cc=daniel.thompson@linaro.org \
--cc=dianders@chromium.org \
--cc=ito-yuichi@fujitsu.com \
--cc=jpoimboe@kernel.org \
--cc=kgdb-bugreport@lists.sourceforge.net \
--cc=lecopzer.chen@mediatek.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-perf-users@vger.kernel.org \
--cc=mark.rutland@arm.com \
--cc=maz@kernel.org \
--cc=msys.mizuma@gmail.com \
--cc=peterz@infradead.org \
--cc=rafael.j.wysocki@intel.com \
--cc=scott@os.amperecomputing.com \
--cc=sumit.garg@linaro.org \
--cc=tglx@linutronix.de \
--cc=vschneid@redhat.com \
--cc=wens@csie.org \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.