From: Jon Masters <jcm@redhat.com>
To: Graeme Gregory <gg@slimlogic.co.uk>
Cc: Hanjun Guo <hanjun.guo@linaro.org>,
Catalin Marinas <catalin.marinas@arm.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Mark Rutland <mark.rutland@arm.com>,
Olof Johansson <olof@lixom.net>,
Grant Likely <grant.likely@linaro.org>,
Will Deacon <will.deacon@arm.com>, Rob Herring <robh@kernel.org>,
Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>,
Robert Richter <rric@kernel.org>,
Jason Cooper <jason@lakedaemon.net>,
Arnd Bergmann <arnd@arndb.de>,
linaro-acpi@lists.linaro.org, Marc Zyngier <marc.zyngier@arm.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Liviu Dudau <Liviu.Dudau@arm.com>,
Robert Moore <robert.moore@intel.com>,
Tomasz Nowicki <tomasz.nowicki@linaro.org>,
linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
Mark Brown <broonie@kernel.org>,
Randy Dunlap <rdunlap@infradead.org>,
Lv Zheng <lv.zheng@intel.com>,
Sudeep Holla <Sudeep.Holla@arm.com>,
Bjorn Helgaas <bhelgaas@google.com>,
Graeme Gregory <graeme.gregory@linaro.org>,
linux-arm-kernel@lists.infradead.org,
Charles.Garcia-Tobin@arm.com
Subject: Re: [PATCH v4 05/18] ARM64 / ACPI: Introduce sleep-arm.c
Date: Fri, 12 Sep 2014 17:10:32 -0400 [thread overview]
Message-ID: <54136148.40106@redhat.com> (raw)
In-Reply-To: <20140912200355.GD9234@xora-haswell.xora.org.uk>
On 09/12/2014 04:03 PM, Graeme Gregory wrote:
> On Fri, Sep 12, 2014 at 03:43:36PM -0400, Jon Masters wrote:
>> On 09/12/2014 10:00 AM, Hanjun Guo wrote:
>>> From: Graeme Gregory <graeme.gregory@linaro.org>
>>>
>>> ACPI 5.1 does not currently support S states for ARM64 hardware but
>>> ACPI code will call acpi_target_system_state() for device power
>>> managment, so introduce sleep-arm.c to allow other drivers to function
>>> until S states are defined.
>>
>> Aside: ACPI5.1 does define the Platform Communication Channel and CPC
>> (Collaborative Processor Performance Control). Some details need to be
>> fleshed out there for practical 64-bit ARMv8 server systems, but the
>> underpinnings and mechanisms are in place in the 5.1 specification that
>> can be built upon over time to achieve practical S-State equivalence.
^ meant C/P sorry
> Disagree, S-States are about going to sleep or hibernating, that is
> nothing to do with CPU Performance.
Correct. In replying to the above, I was thinking about power and
performance management of components - CPU (C/P), and device (D)
specific power/performance states - not the overall system (S) state,
and I went off on a tangent. That was off-topic. For the actual topic at
hand, that of global sleep, you are correct that only G0 (S0) and S5 are
really defined today. Though I do think that the PCC might be used to
actually implement overall system sleep state transitions later.
Jon.
next prev parent reply other threads:[~2014-09-12 21:12 UTC|newest]
Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-12 13:59 [PATCH v4 00/18] Introduce ACPI for ARM64 based on ACPI 5.1 Hanjun Guo
2014-09-12 13:59 ` [PATCH v4 01/18] ARM64: Move the init of cpu_logical_map(0) before unflatten_device_tree() Hanjun Guo
2014-09-12 19:34 ` Jon Masters
2014-09-15 6:16 ` Olof Johansson
2014-09-17 16:48 ` Mark Rutland
2014-09-12 14:00 ` [PATCH v4 02/18] ACPI / table: Add new function to get table entries Hanjun Guo
2014-09-15 16:48 ` Grant Likely
2014-09-12 14:00 ` [PATCH v4 03/18] ACPI / table: Count matched and successfully parsed entries without specifying max entries Hanjun Guo
2014-09-15 16:48 ` Grant Likely
2014-09-12 14:00 ` [PATCH v4 04/18] ARM64 / ACPI: Get RSDP and ACPI boot-time tables Hanjun Guo
2014-09-12 14:00 ` [PATCH v4 05/18] ARM64 / ACPI: Introduce sleep-arm.c Hanjun Guo
2014-09-12 14:51 ` Catalin Marinas
2014-09-12 15:18 ` Graeme Gregory
2014-09-12 15:49 ` Catalin Marinas
2014-09-12 16:32 ` Graeme Gregory
2014-09-17 1:31 ` Matthew Garrett
2014-09-12 19:43 ` Jon Masters
2014-09-12 20:03 ` Graeme Gregory
2014-09-12 21:10 ` Jon Masters [this message]
2014-09-12 14:00 ` [PATCH v4 06/18] ARM64 / ACPI: Introduce early_param for "acpi" Hanjun Guo
2014-09-15 6:28 ` Olof Johansson
2014-09-15 14:51 ` Catalin Marinas
2014-09-15 16:09 ` Olof Johansson
2014-09-15 16:31 ` Jon Masters
2014-09-15 22:55 ` Hanjun Guo
2014-09-12 14:00 ` [PATCH v4 07/18] ARM64 / ACPI: If we chose to boot from acpi then disable FDT Hanjun Guo
2014-09-12 14:00 ` [PATCH v4 08/18] ARM64 / ACPI: Make PCI optional for ACPI on ARM64 Hanjun Guo
2014-09-12 14:00 ` [PATCH v4 09/18] ARM64 / ACPI: Parse FADT table to get PSCI flags for PSCI init Hanjun Guo
2014-09-15 6:38 ` Olof Johansson
2014-09-15 14:54 ` Catalin Marinas
2014-09-15 23:24 ` Jon Masters
2014-09-15 23:34 ` Hanjun Guo
2014-09-12 14:00 ` [PATCH v4 10/18] ACPI / table: Print GIC information when MADT is parsed Hanjun Guo
2014-09-15 6:40 ` Olof Johansson
2014-09-15 14:11 ` Jon Masters
2014-09-15 17:52 ` Grant Likely
2014-09-15 18:01 ` Olof Johansson
2014-09-15 21:55 ` Jon Masters
2014-09-12 14:00 ` [PATCH v4 11/18] ARM64 / ACPI: Parse MADT for SMP initialization Hanjun Guo
2014-09-12 19:47 ` Jon Masters
2014-09-15 14:56 ` Catalin Marinas
2014-09-15 23:19 ` Jon Masters
2014-09-15 7:00 ` Olof Johansson
2014-09-16 0:01 ` Hanjun Guo
2014-09-12 14:00 ` [PATCH v4 12/18] ACPI / processor: Make it possible to get CPU hardware ID via GICC Hanjun Guo
2014-09-15 7:05 ` Olof Johansson
2014-09-16 0:11 ` Hanjun Guo
2014-09-12 14:00 ` [PATCH v4 13/18] ARM64 / ACPI: Introduce ACPI_IRQ_MODEL_GIC and register device's gsi Hanjun Guo
2014-09-12 14:00 ` [PATCH v4 14/18] ARM64 / ACPI: Add GICv2 specific ACPI boot support Hanjun Guo
2014-09-12 19:48 ` Jon Masters
2014-09-15 15:01 ` Catalin Marinas
2014-09-15 16:16 ` Jon Masters
2014-09-15 16:42 ` Catalin Marinas
2014-09-17 7:40 ` Tomasz Nowicki
2014-09-17 15:14 ` Catalin Marinas
2014-09-18 2:25 ` Arnd Bergmann
2014-09-18 16:00 ` Catalin Marinas
2014-09-12 14:00 ` [PATCH v4 15/18] ARM64 / ACPI: Parse GTDT to initialize arch timer Hanjun Guo
2014-09-15 7:13 ` Olof Johansson
2014-09-12 14:00 ` [PATCH v4 16/18] ARM64 / ACPI: Select ACPI_REDUCED_HARDWARE_ONLY if ACPI is enabled on ARM64 Hanjun Guo
2014-09-12 14:00 ` [PATCH v4 17/18] ARM64 / ACPI: Enable ARM64 in Kconfig Hanjun Guo
2014-09-12 14:00 ` [PATCH v4 18/18] Documentation: ACPI for ARM64 Hanjun Guo
2014-09-15 7:33 ` Olof Johansson
2014-09-17 1:44 ` Matthew Garrett
2014-09-17 1:57 ` Matthew Garrett
2014-09-17 8:58 ` Jon Masters
2014-09-17 17:02 ` Mark Brown
2014-09-17 16:05 ` Graeme Gregory
2014-09-17 23:22 ` Arnd Bergmann
2014-09-17 23:40 ` Graeme Gregory
2014-09-18 15:54 ` Catalin Marinas
2014-09-18 23:20 ` Rafael J. Wysocki
2014-09-18 23:59 ` Jon Masters
2014-09-17 19:37 ` Rafael J. Wysocki
2014-09-17 19:22 ` Matthew Garrett
2014-09-17 19:29 ` Jon Masters
2014-09-17 20:11 ` Rafael J. Wysocki
2014-09-17 19:59 ` Matthew Garrett
2014-09-17 23:06 ` Hanjun Guo
2014-09-22 19:48 ` Pavel Machek
2014-09-22 20:31 ` Matthew Garrett
2014-09-22 22:46 ` Rafael J. Wysocki
2014-09-22 22:28 ` Matthew Garrett
2014-09-22 22:34 ` Hanjun Guo
2014-09-22 22:38 ` Matthew Garrett
2014-09-22 23:22 ` Rafael J. Wysocki
2014-09-22 22:55 ` Al Stone
2014-09-22 23:07 ` Matthew Garrett
2014-09-22 22:40 ` Al Stone
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