diff options
Diffstat (limited to 'meta-eas/recipes-kernel/linux/linux-renesas/0042-arm-Set-SD_ASYM_CPUCAPACITY-for-big.LITTLE-platforms.patch')
| -rw-r--r-- | meta-eas/recipes-kernel/linux/linux-renesas/0042-arm-Set-SD_ASYM_CPUCAPACITY-for-big.LITTLE-platforms.patch | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/meta-eas/recipes-kernel/linux/linux-renesas/0042-arm-Set-SD_ASYM_CPUCAPACITY-for-big.LITTLE-platforms.patch b/meta-eas/recipes-kernel/linux/linux-renesas/0042-arm-Set-SD_ASYM_CPUCAPACITY-for-big.LITTLE-platforms.patch new file mode 100644 index 0000000..9225712 --- /dev/null +++ b/meta-eas/recipes-kernel/linux/linux-renesas/0042-arm-Set-SD_ASYM_CPUCAPACITY-for-big.LITTLE-platforms.patch @@ -0,0 +1,80 @@ +From 68c09523de80d3510269aa418c5c3814c4aae56b Mon Sep 17 00:00:00 2001 +From: Morten Rasmussen <morten.rasmussen@arm.com> +Date: Fri, 17 Jun 2016 15:03:34 +0100 +Subject: [PATCH 42/92] arm: Set SD_ASYM_CPUCAPACITY for big.LITTLE platforms + +Set the SD_ASYM_CPUCAPACITY flag for DIE level sched_domains +on big.LITTLE systems. + +cc: Russell King <linux@arm.linux.org.uk> + +Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com> +(cherry picked from commit 2954ca1a61107ff029d1668dadae88c5e43035e5) +Signed-off-by: Gaku Inami <gaku.inami.xw@bp.renesas.com> +--- + arch/arm/kernel/topology.c | 16 +++++++++++++++- + 1 file changed, 15 insertions(+), 1 deletion(-) + +diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c +index e521b07..69fb4b6 100644 +--- a/arch/arm/kernel/topology.c ++++ b/arch/arm/kernel/topology.c +@@ -154,6 +154,7 @@ struct cpu_efficiency { + static u32 *raw_capacity; + static bool cap_parsing_failed; + static u32 capacity_scale; ++static bool asym_cpucap; + + static int __init parse_cpu_capacity(struct device_node *cpu_node, int cpu) + { +@@ -210,6 +211,8 @@ static void normalize_cpu_capacity(void) + set_capacity_scale(cpu, capacity); + pr_debug("cpu_capacity: CPU%d cpu_capacity=%lu\n", + cpu, arch_scale_cpu_capacity(NULL, cpu)); ++ if (capacity < capacity_scale) ++ asym_cpucap = true; + } + mutex_unlock(&cpu_scale_mutex); + } +@@ -422,6 +425,9 @@ static void __init parse_dt_topology(void) + middle_capacity = ((max_capacity / 3) + >> (SCHED_CAPACITY_SHIFT-1)) + 1; + ++ if (max_capacity && max_capacity != min_capacity) ++ asym_cpucap = true; ++ + if (cap_from_dt && !cap_parsing_failed) + normalize_cpu_capacity(); + } +@@ -438,6 +444,9 @@ static void update_cpu_capacity(unsigned int cpu) + + set_capacity_scale(cpu, cpu_capacity(cpu) / middle_capacity); + ++ if (scale_cpu_capacity(NULL, cpu) < SCHED_CAPACITY_SCALE) ++ asym_cpucap = true; ++ + pr_info("CPU%u: update cpu_capacity %lu\n", + cpu, arch_scale_cpu_capacity(NULL, cpu)); + } +@@ -553,12 +562,17 @@ static inline int cpu_corepower_flags(void) + return SD_SHARE_PKG_RESOURCES | SD_SHARE_POWERDOMAIN; + } + ++static inline int arm_cpu_cpu_flags(void) ++{ ++ return asym_cpucap ? 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) }, + #endif +- { cpu_cpu_mask, SD_INIT_NAME(DIE) }, ++ { cpu_cpu_mask, arm_cpu_cpu_flags, SD_INIT_NAME(DIE) }, + { NULL, }, + }; + +-- +1.9.1 + |