From: Rob Herring <robherring2@gmail.com>
To: Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@arm.com>
Cc: Jonas Bonn <jonas@southpole.se>,
devicetree@vger.kernel.org, Michal Simek <monstr@monstr.eu>,
linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org,
Rob Herring <rob.herring@calxeda.com>,
"Rafael J. Wysocki" <rjw@sisk.pl>,
Grant Likely <grant.likely@linaro.org>,
linuxppc-dev@lists.ozlabs.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [RFC PATCH v2 4/4] of: move of_get_cpu_node implementation to DT core library
Date: Mon, 19 Aug 2013 08:11:11 -0500 [thread overview]
Message-ID: <5212196F.4060708@gmail.com> (raw)
In-Reply-To: <1376674791-28244-3-git-send-email-Sudeep.KarkadaNagesha@arm.com>
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.
Otherwise,
Acked-by: Rob Herring <rob.herring@calxeda.com>
Rob
next prev parent reply other threads:[~2013-08-19 13:11 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1374492747-13879-1-git-send-email-Sudeep.KarkadaNagesha@arm.com>
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 [this message]
2013-08-19 13:24 ` Sudeep KarkadaNagesha
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
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