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path: root/arch/arm/kernel/topology.c
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2012-11-19ARM: kernel: update topology to use new MPIDR macrosLorenzo Pieralisi
This patch updates the topology initialization code to use the newly defined accessors to retrieve the MPIDR affinity levels. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Acked-by: Will Deacon <will.deacon@arm.com> Acked-by: Nicolas Pitre <nico@linaro.org>
2012-11-19ARM: kernel: enhance MPIDR macro definitionsLorenzo Pieralisi
Kernel subsystems other than the topology layer need the MPIDR mask definitions to access the MPIDR without relying on hardcoded masks. This patch moves the MPIDR register masks definition to a header file and defines a macro to simplify access to MPIDR bit fields representing affinity levels. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Acked-by: Will Deacon <will.deacon@arm.com> Acked-by: Nicolas Pitre <nico@linaro.org>
2012-08-11ARM: 7482/1: topology: fix section mismatch warning for init_cpu_topologyVenkatraman Sathiyamoorthy
Get rid of this warning.. arch/arm/kernel/built-in.o(.text+0xac78): Section mismatch in reference from the function init_cpu_topology() to the function .init.text:parse_dt_topology() The function init_cpu_topology() references the function __init parse_dt_topology(). This is often because init_cpu_topology lacks a __init annotation or the annotation of parse_dt_topology is wrong. Signed-off-by: Venkatraman S <svenkatr@ti.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2012-07-12ARM: 7463/1: topology: Update cpu_power according to DT informationVincent Guittot
Use cpu compatibility field and clock-frequency field of DT to estimate the capacity of each core of the system and to update the cpu_power field accordingly. This patch enables to put more running tasks on big cores than on LITTLE ones. But this patch doesn't ensure that long running tasks will run on big cores and short ones on LITTLE cores. Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org> Reviewed-by: Namhyung Kim <namhyung@kernel.org> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2012-07-12ARM: 7462/1: topology: factorize the update of sibling masksVincent Guittot
This factorization has also been proposed in another patch that has not been merged yet: http://lists.infradead.org/pipermail/linux-arm-kernel/2012-January/080873.html So, this patch could be dropped depending of the state of the other one. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org> Reviewed-by: Namhyung Kim <namhyung@kernel.org> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2012-07-12ARM: 7461/1: topology: Add arch_scale_freq_power functionVincent Guittot
Add infrastructure to be able to modify the cpu_power of each core Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org> Reviewed-by: Namhyung Kim <namhyung@kernel.org> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-11-30ARM: 7182/1: ARM cpu topology: fix warningVincent Guittot
kernel/sched.c:7354:2: warning: initialization from incompatible pointer type Align cpu_coregroup_mask prototype interface with sched_domain_mask_f typedef use int cpu instead of unsigned int cpu Cc: <stable@vger.kernel.org> Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-10-17ARM: 7011/1: Add ARM cpu topology definitionVincent Guittot
The affinity between ARM processors is defined in the MPIDR register. We can identify which processors are in the same cluster, and which ones have performance interdependency. We can define the cpu topology of ARM platform, that is then used by sched_mc and sched_smt. The default state of sched_mc and sched_smt config is disable. When enabled, the behavior of the scheduler can be modified with sched_mc_power_savings and sched_smt_power_savings sysfs interfaces. Changes since v4 : * Remove unnecessary parentheses and blank lines Changes since v3 : * Update the format of printk message * Remove blank line Changes since v2 : * Update the commit message and some comments Changes since v1 : * Update the commit message * Add read_cpuid_mpidr in arch/arm/include/asm/cputype.h * Modify header of arch/arm/kernel/topology.c * Modify tests and manipulation of MPIDR's bitfields * Modify the place and dependancy of the config * Modify Noop functions Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org> Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>