From: Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@arm.com>
To: Rob Herring <robherring2@gmail.com>
Cc: Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@arm.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
Jonas Bonn <jonas@southpole.se>, Michal Simek <monstr@monstr.eu>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
"rob.herring@calxeda.com" <rob.herring@calxeda.com>,
"Rafael J. Wysocki" <rjw@sisk.pl>,
"grant.likely@linaro.org" <grant.likely@linaro.org>
Subject: Re: [RFC PATCH v2 4/4] of: move of_get_cpu_node implementation to DT core library
Date: Mon, 19 Aug 2013 14:24:20 +0100 [thread overview]
Message-ID: <52121C84.1030102@arm.com> (raw)
In-Reply-To: <5212196F.4060708@gmail.com>
On 19/08/13 14:11, Rob Herring wrote:
> On 08/16/2013 12:39 PM, Sudeep KarkadaNagesha wrote:
>> From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
>>
>> This patch moves the generalized implementation of of_get_cpu_node from
>> PowerPC to DT core library, thereby adding support for retrieving cpu
>> node for a given logical cpu index on any architecture.
>>
>> The CPU subsystem can now use this function to assign of_node in the
>> cpu device while registering CPUs.
>>
>> It is recommended to use these helper function only in pre-SMP/early
>> initialisation stages to retrieve CPU device node pointers in logical
>> ordering. Once the cpu devices are registered, it can be retrieved easily
>> from cpu device of_node which avoids unnecessary parsing and matching.
>>
>> Cc: Rob Herring <rob.herring@calxeda.com>
>> Cc: Grant Likely <grant.likely@linaro.org>
>> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
>> Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
>
> [snip]
>
>> +/**
>> + * of_get_cpu_node - Get device node associated with the given logical CPU
>> + *
>> + * @cpu: CPU number(logical index) for which device node is required
>> + * @thread: if not NULL, local thread number within the physical core is
>> + * returned
>> + *
>> + * The main purpose of this function is to retrieve the device node for the
>> + * given logical CPU index. It should be used to initialize the of_node in
>> + * cpu device. Once of_node in cpu device is populated, all the further
>> + * references can use that instead.
>> + *
>> + * CPU logical to physical index mapping is architecture specific and is built
>> + * before booting secondary cores. This function uses arch_match_cpu_phys_id
>> + * which can be overridden by architecture specific implementation.
>> + *
>> + * Returns a node pointer for the logical cpu if found, else NULL.
>> + */
>> +struct device_node *of_get_cpu_node(int cpu, unsigned int *thread)
>> +{
>> + struct device_node *cpun, *cpus;
>> +
>> + cpus = of_find_node_by_path("/cpus");
>> + if (!cpus) {
>> + pr_warn("Missing cpus node, bailing out\n");
>> + return NULL;
>> + }
>> +
>> + for_each_child_of_node(cpus, cpun) {
>> + if (of_node_cmp(cpun->type, "cpu"))
>> + continue;
>> +#ifdef CONFIG_PPC
>
> You don't really need this ifdef as this function should never succeed
> on other arches. Alternatively, you can use "IS_ENABLED(CONFIG_PPC)"
> instead.
>
Agreed, I can remove it as long as no other architecture use that
property. It's just to avoid checking for it on other architectures.
I will use IS_ENABLED as you suggested.
> Otherwise,
>
> Acked-by: Rob Herring <rob.herring@calxeda.com>
>
Thanks.
Regards,
Sudeep
next prev parent reply other threads:[~2013-08-19 13:24 UTC|newest]
Thread overview: 127+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-17 14:06 [RFC PATCH v2 00/15] DT/core: update cpu device of_node Sudeep.KarkadaNagesha
2013-07-17 14:06 ` [RFC PATCH v2 01/15] of: add support for retrieving cpu node for a given logical cpu index Sudeep.KarkadaNagesha
2013-07-17 14:30 ` Nicolas Pitre
2013-07-17 14:50 ` Rob Herring
2013-07-17 15:18 ` Sudeep KarkadaNagesha
2013-07-17 14:06 ` [RFC PATCH v2 02/15] driver/core: cpu: initialize of_node in cpu's device struture Sudeep.KarkadaNagesha
2013-07-17 14:06 ` [RFC PATCH v2 03/15] ARM: DT/kernel: define ARM specific arch_match_cpu_phys_id Sudeep.KarkadaNagesha
2013-07-17 14:06 ` [RFC PATCH v2 04/15] ARM: topology: remove hwid/MPIDR dependency from cpu_capacity Sudeep.KarkadaNagesha
2013-07-17 14:06 ` [RFC PATCH v2 05/15] ARM: mvebu: remove device tree parsing for cpu nodes Sudeep.KarkadaNagesha
2013-07-17 14:06 ` [RFC PATCH v2 06/15] drivers/bus: arm-cci: avoid parsing DT for cpu device nodes Sudeep.KarkadaNagesha
2013-07-17 14:06 ` [RFC PATCH v2 07/15] cpufreq: imx6q-cpufreq: remove device tree parsing for cpu nodes Sudeep.KarkadaNagesha
2013-07-17 14:06 ` [RFC PATCH v2 08/15] cpufreq: cpufreq-cpu0: " Sudeep.KarkadaNagesha
2013-07-17 14:06 ` [RFC PATCH v2 09/15] cpufreq: highbank-cpufreq: " Sudeep.KarkadaNagesha
2013-07-17 14:06 ` [RFC PATCH v2 10/15] cpufreq: spear-cpufreq: " Sudeep.KarkadaNagesha
2013-07-17 14:06 ` [RFC PATCH v2 11/15] cpufreq: kirkwood-cpufreq: " Sudeep.KarkadaNagesha
2013-07-17 14:43 ` Andrew Lunn
2013-07-18 7:53 ` Viresh Kumar
2013-07-18 8:24 ` Sudeep KarkadaNagesha
2013-07-18 10:14 ` Sudeep KarkadaNagesha
2013-07-18 18:30 ` Rob Herring
2013-07-17 14:06 ` [RFC PATCH v2 12/15] cpufreq: arm_big_little: " Sudeep.KarkadaNagesha
2013-07-17 14:06 ` [RFC PATCH v2 13/15] cpufreq: maple-cpufreq: " Sudeep.KarkadaNagesha
2013-07-17 14:06 ` [RFC PATCH v2 14/15] cpufreq: pmac64-cpufreq: " Sudeep.KarkadaNagesha
2013-07-17 14:06 ` [RFC PATCH v2 15/15] cpufreq: pmac32-cpufreq: " Sudeep.KarkadaNagesha
2013-07-18 7:54 ` [RFC PATCH v2 00/15] DT/core: update cpu device of_node Viresh Kumar
2013-07-22 11:32 ` [PATCH v3 00/16] " Sudeep KarkadaNagesha
2013-07-22 11:32 ` [PATCH v3 01/16] of: add support for retrieving cpu node for a given logical cpu index Sudeep KarkadaNagesha
2013-07-22 14:14 ` Nicolas Pitre
2013-07-22 15:07 ` Sudeep KarkadaNagesha
2013-07-23 10:54 ` Sudeep KarkadaNagesha
2013-08-15 11:32 ` Tomasz Figa
2013-08-15 14:59 ` Sudeep KarkadaNagesha
2013-07-22 11:32 ` [PATCH v3 02/16] ARM: DT/kernel: define ARM specific arch_match_cpu_phys_id Sudeep KarkadaNagesha
2013-07-22 14:14 ` Nicolas Pitre
2013-07-22 11:32 ` [PATCH v3 03/16] driver/core: cpu: initialize of_node in cpu's device struture Sudeep KarkadaNagesha
2013-08-15 11:35 ` Tomasz Figa
2013-08-15 15:13 ` Sudeep KarkadaNagesha
2013-07-22 11:32 ` [PATCH v3 04/16] ARM: topology: remove hwid/MPIDR dependency from cpu_capacity Sudeep KarkadaNagesha
2013-07-22 14:25 ` Nicolas Pitre
2013-07-22 11:32 ` [PATCH v3 05/16] ARM: mvebu: remove device tree parsing for cpu nodes Sudeep KarkadaNagesha
2013-08-01 9:54 ` Sudeep KarkadaNagesha
2013-08-01 12:02 ` Jason Cooper
2013-08-05 16:28 ` Sudeep KarkadaNagesha
2013-08-06 8:25 ` Gregory CLEMENT
2013-08-06 9:02 ` Sudeep KarkadaNagesha
2013-07-22 11:32 ` [PATCH v3 06/16] drivers/bus: arm-cci: avoid parsing DT for cpu device nodes Sudeep KarkadaNagesha
2013-07-22 14:37 ` Nicolas Pitre
2013-07-22 11:32 ` [PATCH v3 07/16] of/device: add helper to get cpu device node from logical cpu index Sudeep KarkadaNagesha
2013-07-26 17:01 ` Sudeep KarkadaNagesha
2013-07-26 18:55 ` Rob Herring
2013-07-22 11:32 ` [PATCH v3 08/16] cpufreq: imx6q-cpufreq: remove device tree parsing for cpu nodes Sudeep KarkadaNagesha
2013-07-22 11:32 ` [PATCH v3 09/16] cpufreq: cpufreq-cpu0: " Sudeep KarkadaNagesha
2013-07-22 11:32 ` [PATCH v3 10/16] cpufreq: highbank-cpufreq: " Sudeep KarkadaNagesha
2013-07-22 11:32 ` [PATCH v3 11/16] cpufreq: spear-cpufreq: " Sudeep KarkadaNagesha
2013-07-22 11:32 ` [PATCH v3 12/16] cpufreq: kirkwood-cpufreq: " Sudeep KarkadaNagesha
2013-07-23 9:25 ` Andrew Lunn
2013-07-22 11:32 ` [PATCH v3 13/16] cpufreq: arm_big_little: " Sudeep KarkadaNagesha
2013-07-22 11:32 ` [PATCH v3 14/16] cpufreq: maple-cpufreq: " Sudeep KarkadaNagesha
2013-07-22 11:32 ` [PATCH v3 15/16] cpufreq: pmac64-cpufreq: " Sudeep KarkadaNagesha
2013-07-22 11:32 ` [PATCH v3 16/16] cpufreq: pmac32-cpufreq: " Sudeep KarkadaNagesha
2013-08-01 10:05 ` [PATCH v3 00/16] DT/core: update cpu device of_node Sudeep KarkadaNagesha
2013-08-15 17:09 ` [RFC PATCH 0/4] DT: move of_get_cpu_node from PPC to DT core Sudeep KarkadaNagesha
2013-08-15 17:09 ` [RFC PATCH 1/4] microblaze: remove undefined of_get_cpu_node declaration Sudeep KarkadaNagesha
2013-08-15 17:09 ` [RFC PATCH 2/4] openrisc: " Sudeep KarkadaNagesha
2013-08-16 9:41 ` Sudeep KarkadaNagesha
2013-08-21 5:10 ` Jonas Bonn
2013-08-15 17:09 ` [RFC PATCH 3/4] powerpc: refactor of_get_cpu_node to support other architectures Sudeep KarkadaNagesha
2013-08-16 4:49 ` Benjamin Herrenschmidt
2013-08-16 8:48 ` Sudeep KarkadaNagesha
2013-08-16 12:32 ` Benjamin Herrenschmidt
2013-08-16 12:44 ` Sudeep KarkadaNagesha
2013-08-16 4:50 ` Benjamin Herrenschmidt
2013-08-16 8:43 ` Sudeep KarkadaNagesha
2013-08-15 17:09 ` [RFC PATCH 4/4] of: move of_get_cpu_node implementation to DT core library Sudeep KarkadaNagesha
2013-08-16 17:39 ` [RFC PATCH v2 0/4] DT: move of_get_cpu_node from PPC to DT core Sudeep KarkadaNagesha
2013-08-16 17:39 ` [RFC PATCH v2 3/4] powerpc: refactor of_get_cpu_node to support other architectures Sudeep KarkadaNagesha
2013-08-16 22:13 ` Benjamin Herrenschmidt
2013-08-19 10:13 ` Sudeep KarkadaNagesha
2013-08-17 10:50 ` Tomasz Figa
2013-08-17 22:09 ` Benjamin Herrenschmidt
2013-08-17 22:22 ` Tomasz Figa
2013-08-19 10:19 ` Mark Rutland
2013-08-19 13:02 ` Rob Herring
2013-08-19 13:56 ` Sudeep KarkadaNagesha
2013-08-22 13:59 ` Mark Rutland
2013-08-22 16:51 ` Sudeep KarkadaNagesha
2013-08-28 19:46 ` Grant Likely
2013-08-29 9:50 ` Lorenzo Pieralisi
2013-08-16 17:39 ` [RFC PATCH v2 4/4] of: move of_get_cpu_node implementation to DT core library Sudeep KarkadaNagesha
2013-08-16 22:14 ` Benjamin Herrenschmidt
2013-08-19 10:21 ` Sudeep KarkadaNagesha
2013-08-19 13:11 ` Rob Herring
2013-08-19 13:24 ` Sudeep KarkadaNagesha [this message]
2013-08-20 9:30 ` [PATCH v4 00/19] DT/core: update cpu device of_node Sudeep KarkadaNagesha
2013-08-20 9:30 ` [PATCH v4 01/19] microblaze: remove undefined of_get_cpu_node declaration Sudeep KarkadaNagesha
2013-08-20 9:30 ` [PATCH v4 02/19] openrisc: " Sudeep KarkadaNagesha
2013-08-20 9:30 ` [PATCH v4 03/19] powerpc: refactor of_get_cpu_node to support other architectures Sudeep KarkadaNagesha
2013-08-20 12:27 ` Rafael J. Wysocki
2013-08-20 12:22 ` Sudeep KarkadaNagesha
2013-08-20 21:48 ` Benjamin Herrenschmidt
2013-08-22 6:15 ` Benjamin Herrenschmidt
2013-08-22 13:29 ` Sudeep KarkadaNagesha
2013-08-20 9:30 ` [PATCH v4 04/19] of: move of_get_cpu_node implementation to DT core library Sudeep KarkadaNagesha
2013-08-20 9:30 ` [PATCH v4 05/19] ARM: DT/kernel: define ARM specific arch_match_cpu_phys_id Sudeep KarkadaNagesha
2013-08-20 9:30 ` [PATCH v4 06/19] driver/core: cpu: initialize of_node in cpu's device struture Sudeep KarkadaNagesha
2013-08-20 12:28 ` Rafael J. Wysocki
2013-08-20 15:18 ` Greg Kroah-Hartman
2013-08-20 9:30 ` [PATCH v4 07/19] of/device: add helper to get cpu device node from logical cpu index Sudeep KarkadaNagesha
2013-08-20 9:30 ` [PATCH v4 08/19] ARM: topology: remove hwid/MPIDR dependency from cpu_capacity Sudeep KarkadaNagesha
2013-08-20 9:30 ` [PATCH v4 09/19] ARM: mvebu: remove device tree parsing for cpu nodes Sudeep KarkadaNagesha
2013-08-20 9:30 ` [PATCH v4 10/19] drivers/bus: arm-cci: avoid parsing DT for cpu device nodes Sudeep KarkadaNagesha
2013-08-20 9:30 ` [PATCH v4 11/19] cpufreq: imx6q-cpufreq: remove device tree parsing for cpu nodes Sudeep KarkadaNagesha
2013-08-20 9:30 ` [PATCH v4 12/19] cpufreq: cpufreq-cpu0: " Sudeep KarkadaNagesha
2013-09-06 13:44 ` Guennadi Liakhovetski
2013-09-09 9:24 ` Sudeep KarkadaNagesha
2013-09-09 14:32 ` Shawn Guo
2013-09-09 15:24 ` Sudeep KarkadaNagesha
2013-09-10 2:44 ` Shawn Guo
2013-09-10 10:56 ` Sudeep KarkadaNagesha
2013-09-10 11:19 ` Shawn Guo
2013-08-20 9:30 ` [PATCH v4 13/19] cpufreq: highbank-cpufreq: " Sudeep KarkadaNagesha
2013-08-20 9:30 ` [PATCH v4 14/19] cpufreq: spear-cpufreq: " Sudeep KarkadaNagesha
2013-08-20 9:30 ` [PATCH v4 15/19] cpufreq: kirkwood-cpufreq: " Sudeep KarkadaNagesha
2013-08-20 9:30 ` [PATCH v4 16/19] cpufreq: arm_big_little: " Sudeep KarkadaNagesha
2013-08-20 9:30 ` [PATCH v4 17/19] cpufreq: maple-cpufreq: " Sudeep KarkadaNagesha
2013-08-20 9:30 ` [PATCH v4 18/19] cpufreq: pmac64-cpufreq: " Sudeep KarkadaNagesha
2013-08-20 9:30 ` [PATCH v4 19/19] cpufreq: pmac32-cpufreq: " Sudeep KarkadaNagesha
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=52121C84.1030102@arm.com \
--to=sudeep.karkadanagesha@arm.com \
--cc=benh@kernel.crashing.org \
--cc=devicetree@vger.kernel.org \
--cc=grant.likely@linaro.org \
--cc=jonas@southpole.se \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=monstr@monstr.eu \
--cc=rjw@sisk.pl \
--cc=rob.herring@calxeda.com \
--cc=robherring2@gmail.com \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).