Messages in this thread Patch in this message | | | From | Morten Rasmussen <> | Subject | [PATCH v2 12/13] arm: Set SD_ASYM_CPUCAPACITY for big.LITTLE platforms | Date | Wed, 22 Jun 2016 18:03:23 +0100 |
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Set the SD_ASYM_CPUCAPACITY flag for DIE and MC level sched_domains on big.LITTLE systems.
cc: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com> --- arch/arm/kernel/topology.c | 23 ++++++++++++++++++++--- 1 file changed, 20 insertions(+), 3 deletions(-)
diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c index ec279d161b32..ab6d9c1835a4 100644 --- a/arch/arm/kernel/topology.c +++ b/arch/arm/kernel/topology.c @@ -78,6 +78,7 @@ static unsigned long *__cpu_capacity; #define cpu_capacity(cpu) __cpu_capacity[cpu] static unsigned long middle_capacity = 1; +static unsigned int big_little; /* * Iterate all CPUs' descriptor in DT and compute the efficiency @@ -151,6 +152,8 @@ static void __init parse_dt_topology(void) middle_capacity = ((max_capacity / 3) >> (SCHED_CAPACITY_SHIFT-1)) + 1; + if (max_capacity && max_capacity != min_capacity) + big_little = 1; } /* @@ -277,15 +280,29 @@ void store_cpu_topology(unsigned int cpuid) static inline int cpu_corepower_flags(void) { - return SD_SHARE_PKG_RESOURCES | SD_SHARE_POWERDOMAIN; + int flags = SD_SHARE_PKG_RESOURCES | SD_SHARE_POWERDOMAIN; + + return big_little ? SD_ASYM_CPUCAPACITY | flags : flags; +} + +static inline int arm_cpu_core_flags(void) +{ + int flags = SD_SHARE_PKG_RESOURCES; + + return big_little ? SD_ASYM_CPUCAPACITY | flags : flags; +} + +static inline int arm_cpu_cpu_flags(void) +{ + return big_little ? SD_ASYM_CPUCAPACITY : 0; } static struct sched_domain_topology_level arm_topology[] = { #ifdef CONFIG_SCHED_MC { cpu_corepower_mask, cpu_corepower_flags, SD_INIT_NAME(GMC) }, - { cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) }, + { cpu_coregroup_mask, arm_cpu_core_flags, SD_INIT_NAME(MC) }, #endif - { cpu_cpu_mask, SD_INIT_NAME(DIE) }, + { cpu_cpu_mask, arm_cpu_cpu_flags, SD_INIT_NAME(DIE) }, { NULL, }, }; -- 1.9.1
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