From: "Lurndal, Scott" <Scott.Lurndal@cavium.com>
To: Fu Wei <fu.wei@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
Linaro ACPI Mailman List <linaro-acpi@lists.linaro.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Wim Van Sebroeck <wim@iguana.be>, Wei Huang <wei@redhat.com>,
Tomasz Nowicki <tn@semihalf.com>,
Timur Tabi <timur@codeaurora.org>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
Guenter Roeck <linux@roeck-us.net>, Len Brown <lenb@kernel.org>,
"Abdulhamid, Harb" <harba@codeaurora.org>,
Julien Grall <julien.grall@arm.com>,
linux-watchdog@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
Marc Zyngier <marc.zyngier@arm.com>, Jon Masters <jcm@redhat.com>,
Christopher Covington <cov@codeaurora.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [Linaro-acpi] [PATCH v21 13/13] acpi/arm64: Add SBSA Generic Watchdog support in GTDT driver
Date: Tue, 21 Mar 2017 05:48:13 -0700 [thread overview]
Message-ID: <20170321124813.GB31496@slurndal-lnx1.caveonetworks.com> (raw)
In-Reply-To: <CADyBb7vgzLCoFO6p=mu=D93VSHwuFh6cLEwVD9PvvuOUGxEgcw@mail.gmail.com>
On Tue, Mar 21, 2017 at 11:48:02AM +0800, Fu Wei wrote:
> Hi Mark, Lurndal,
>
> >> The base server system implements _a_ Generic Watchdog as
> >> specified in APPENDIX A: Generic Watchdog.
> >
> > It is a requirement of a conforming implementation that there
> > be a generic watchdog (impl as per the appendix). That doesn't preclude
> > an implmentation from providing additional watchdogs (for example, if
> > the processor implements EL3, it is likely that an implementation
> > will include a secure watchdog as well as a non-secure watchdog).
> >
> > The SBSA describes the minimal hardware requirements for a
> > compliant server.
>
> So I think, for the SBSA watchdog:
>
> (1) there maybe more then one non-secure watchdog in GTDT
I suppose a firmware vendor could chose to expose more than the
platform minimum to linux. Not quite sure what linux would
do with it :-)
>
> (2) we may also need to skip secure watchdogs in GTDT,
> and only register non-secure watchdogs into platform resources.
The secure watchdog will, be definition, never be accessible
to non-secure EL2 or non-secure EL1, so only in the case of
a secure EL1 operating system would the secure watchdog ever
be conveyed through ACPI. I don't think secure EL1 is in
the scope of the SBSA, or something that needs to be accomodated
in the GTDT at this time.
scott
WARNING: multiple messages have this Message-ID (diff)
From: "Lurndal, Scott" <Scott.Lurndal@cavium.com>
To: Fu Wei <fu.wei@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
Linaro ACPI Mailman List <linaro-acpi@lists.linaro.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Wim Van Sebroeck <wim@iguana.be>, Wei Huang <wei@redhat.com>,
Tomasz Nowicki <tn@semihalf.com>,
Timur Tabi <timur@codeaurora.org>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
Guenter Roeck <linux@roeck-us.net>, Len Brown <lenb@kernel.org>,
"Abdulhamid, Harb" <harba@codeaurora.org>,
Julien Grall <julien.grall@arm.com>,
linux-watchdog@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
Marc Zyngier <marc.zyngier@arm.com>, Jon Masters <jcm@redhat.com>,
Christopher Covington <cov@codeaurora.org>,
Thomas Gleixner <tglx@linutronix.de>,
linux-arm-kernel@lists.infradead.org,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Sudeep Holla <sudeep.holla@arm.com>,
Christoffer Dall <christoffer.dall@linaro.org>
Subject: Re: [Linaro-acpi] [PATCH v21 13/13] acpi/arm64: Add SBSA Generic Watchdog support in GTDT driver
Date: Tue, 21 Mar 2017 05:48:13 -0700 [thread overview]
Message-ID: <20170321124813.GB31496@slurndal-lnx1.caveonetworks.com> (raw)
In-Reply-To: <CADyBb7vgzLCoFO6p=mu=D93VSHwuFh6cLEwVD9PvvuOUGxEgcw@mail.gmail.com>
On Tue, Mar 21, 2017 at 11:48:02AM +0800, Fu Wei wrote:
> Hi Mark, Lurndal,
>
> >> The base server system implements _a_ Generic Watchdog as
> >> specified in APPENDIX A: Generic Watchdog.
> >
> > It is a requirement of a conforming implementation that there
> > be a generic watchdog (impl as per the appendix). That doesn't preclude
> > an implmentation from providing additional watchdogs (for example, if
> > the processor implements EL3, it is likely that an implementation
> > will include a secure watchdog as well as a non-secure watchdog).
> >
> > The SBSA describes the minimal hardware requirements for a
> > compliant server.
>
> So I think, for the SBSA watchdog:
>
> (1) there maybe more then one non-secure watchdog in GTDT
I suppose a firmware vendor could chose to expose more than the
platform minimum to linux. Not quite sure what linux would
do with it :-)
>
> (2) we may also need to skip secure watchdogs in GTDT,
> and only register non-secure watchdogs into platform resources.
The secure watchdog will, be definition, never be accessible
to non-secure EL2 or non-secure EL1, so only in the case of
a secure EL1 operating system would the secure watchdog ever
be conveyed through ACPI. I don't think secure EL1 is in
the scope of the SBSA, or something that needs to be accomodated
in the GTDT at this time.
scott
WARNING: multiple messages have this Message-ID (diff)
From: Scott.Lurndal@cavium.com (Lurndal, Scott)
To: linux-arm-kernel@lists.infradead.org
Subject: [Linaro-acpi] [PATCH v21 13/13] acpi/arm64: Add SBSA Generic Watchdog support in GTDT driver
Date: Tue, 21 Mar 2017 05:48:13 -0700 [thread overview]
Message-ID: <20170321124813.GB31496@slurndal-lnx1.caveonetworks.com> (raw)
In-Reply-To: <CADyBb7vgzLCoFO6p=mu=D93VSHwuFh6cLEwVD9PvvuOUGxEgcw@mail.gmail.com>
On Tue, Mar 21, 2017 at 11:48:02AM +0800, Fu Wei wrote:
> Hi Mark, Lurndal,
>
> >> The base server system implements _a_ Generic Watchdog as
> >> specified in APPENDIX A: Generic Watchdog.
> >
> > It is a requirement of a conforming implementation that there
> > be a generic watchdog (impl as per the appendix). That doesn't preclude
> > an implmentation from providing additional watchdogs (for example, if
> > the processor implements EL3, it is likely that an implementation
> > will include a secure watchdog as well as a non-secure watchdog).
> >
> > The SBSA describes the minimal hardware requirements for a
> > compliant server.
>
> So I think, for the SBSA watchdog:
>
> (1) there maybe more then one non-secure watchdog in GTDT
I suppose a firmware vendor could chose to expose more than the
platform minimum to linux. Not quite sure what linux would
do with it :-)
>
> (2) we may also need to skip secure watchdogs in GTDT,
> and only register non-secure watchdogs into platform resources.
The secure watchdog will, be definition, never be accessible
to non-secure EL2 or non-secure EL1, so only in the case of
a secure EL1 operating system would the secure watchdog ever
be conveyed through ACPI. I don't think secure EL1 is in
the scope of the SBSA, or something that needs to be accomodated
in the GTDT at this time.
scott
next prev parent reply other threads:[~2017-03-21 12:48 UTC|newest]
Thread overview: 98+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-06 18:50 [PATCH v21 00/13] acpi, clocksource: add GTDT driver and GTDT support in arm_arch_timer fu.wei
2017-02-06 18:50 ` fu.wei at linaro.org
2017-02-06 18:50 ` [PATCH v21 01/13] clocksource: arm_arch_timer: introduce two functions to get the frequency from mmio and sysreg fu.wei
2017-02-06 18:50 ` fu.wei at linaro.org
2017-03-17 18:05 ` Mark Rutland
2017-03-17 18:05 ` Mark Rutland
2017-03-17 18:05 ` Mark Rutland
2017-03-20 7:36 ` Fu Wei
2017-03-20 7:36 ` Fu Wei
2017-03-20 7:36 ` Fu Wei
2017-03-20 9:43 ` Fu Wei
2017-03-20 9:43 ` Fu Wei
2017-03-20 9:43 ` Fu Wei
2017-03-20 10:41 ` Mark Rutland
2017-03-20 10:41 ` Mark Rutland
2017-03-20 10:41 ` Mark Rutland
2017-03-20 11:09 ` Fu Wei
2017-03-20 11:09 ` Fu Wei
2017-03-20 11:09 ` Fu Wei
2017-02-06 18:50 ` [PATCH v21 03/13] clocksource: arm_arch_timer: remove arch_timer_detect_rate fu.wei
2017-02-06 18:50 ` fu.wei at linaro.org
2017-03-17 18:07 ` Mark Rutland
2017-03-17 18:07 ` Mark Rutland
2017-03-17 18:07 ` Mark Rutland
2017-03-20 6:59 ` Fu Wei
2017-03-20 6:59 ` Fu Wei
2017-03-20 6:59 ` Fu Wei
2017-02-06 18:50 ` [PATCH v21 04/13] clocksource: arm_arch_timer: split arch_timer_rate for different types of timer fu.wei
2017-02-06 18:50 ` fu.wei at linaro.org
2017-03-17 19:05 ` Mark Rutland
2017-03-17 19:05 ` Mark Rutland
2017-03-17 19:05 ` Mark Rutland
2017-03-20 13:35 ` Fu Wei
2017-03-20 13:35 ` Fu Wei
2017-03-20 13:35 ` Fu Wei
2017-02-06 18:50 ` [PATCH v21 05/13] clocksource: arm_arch_timer: refactor arch_timer_needs_probing fu.wei
2017-02-06 18:50 ` fu.wei at linaro.org
2017-02-06 18:50 ` [PATCH v21 06/13] clocksource: arm_arch_timer: move arch_timer_needs_of_probing into DT init call fu.wei
2017-02-06 18:50 ` fu.wei at linaro.org
2017-02-06 18:50 ` [PATCH v21 07/13] clocksource: arm_arch_timer: introduce some new structs to prepare for GTDT fu.wei
2017-02-06 18:50 ` fu.wei at linaro.org
2017-02-06 18:50 ` [PATCH v21 08/13] clocksource: arm_arch_timer: refactor MMIO timer probing fu.wei
2017-02-06 18:50 ` fu.wei at linaro.org
2017-02-06 18:50 ` [PATCH v21 09/13] acpi/arm64: Add GTDT table parse driver fu.wei
2017-02-06 18:50 ` fu.wei at linaro.org
2017-02-06 18:50 ` [PATCH v21 10/13] clocksource: arm_arch_timer: simplify ACPI support code fu.wei
2017-02-06 18:50 ` fu.wei at linaro.org
2017-02-06 18:50 ` [PATCH v21 11/13] acpi/arm64: Add memory-mapped timer support in GTDT driver fu.wei
2017-02-06 18:50 ` fu.wei at linaro.org
2017-02-06 18:50 ` fu.wei
2017-03-17 19:40 ` Mark Rutland
2017-03-17 19:40 ` Mark Rutland
2017-03-17 19:40 ` Mark Rutland
2017-03-20 13:38 ` Fu Wei
2017-03-20 13:38 ` Fu Wei
2017-03-20 13:38 ` Fu Wei
2017-02-06 18:50 ` [PATCH v21 12/13] clocksource: arm_arch_timer: add GTDT support for memory-mapped timer fu.wei
2017-02-06 18:50 ` fu.wei at linaro.org
2017-02-06 18:50 ` [PATCH v21 13/13] acpi/arm64: Add SBSA Generic Watchdog support in GTDT driver fu.wei
2017-02-06 18:50 ` fu.wei at linaro.org
2017-02-06 18:50 ` fu.wei
2017-03-17 20:01 ` Mark Rutland
2017-03-17 20:01 ` Mark Rutland
2017-03-17 20:01 ` Mark Rutland
2017-03-17 20:01 ` Mark Rutland
2017-03-20 17:57 ` Fu Wei
2017-03-20 17:57 ` Fu Wei
2017-03-20 17:57 ` Fu Wei
2017-03-20 18:09 ` Mark Rutland
2017-03-20 18:09 ` Mark Rutland
2017-03-20 18:09 ` Mark Rutland
2017-03-20 18:50 ` [Linaro-acpi] " Lurndal, Scott
2017-03-20 18:50 ` Lurndal, Scott
2017-03-20 18:50 ` Lurndal, Scott
2017-03-21 3:48 ` Fu Wei
2017-03-21 3:48 ` Fu Wei
2017-03-21 3:48 ` Fu Wei
2017-03-21 12:48 ` Lurndal, Scott [this message]
2017-03-21 12:48 ` Lurndal, Scott
2017-03-21 12:48 ` Lurndal, Scott
2017-03-21 5:12 ` Fu Wei
2017-03-21 5:12 ` Fu Wei
2017-03-21 5:12 ` Fu Wei
[not found] ` <20170206185015.12296-1-fu.wei-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2017-02-06 18:50 ` [PATCH v21 02/13] clocksource: arm_arch_timer: separate out device-tree code from arch_timer_detect_rate fu.wei-QSEj5FYQhm4dnm+yROfE0A
2017-02-06 18:50 ` fu.wei at linaro.org
2017-02-06 18:50 ` fu.wei
2017-02-20 16:20 ` [PATCH v21 00/13] acpi, clocksource: add GTDT driver and GTDT support in arm_arch_timer Fu Wei
2017-02-20 16:20 ` Fu Wei
2017-02-20 16:20 ` Fu Wei
[not found] ` <CADyBb7t_zrLetPQQ8=k8oN6iMHhuMHO8O3XTZqGYvTT9p0evKw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-03-09 22:47 ` Fu Wei
2017-03-09 22:47 ` Fu Wei
2017-03-09 22:47 ` Fu Wei
2017-03-17 20:03 ` Mark Rutland
2017-03-17 20:03 ` Mark Rutland
2017-03-17 20:03 ` Mark Rutland
2017-03-20 5:09 ` Fu Wei
2017-03-20 5:09 ` Fu Wei
2017-03-20 5:09 ` Fu Wei
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