diff options
Diffstat (limited to 'meta-eas/recipes-kernel/linux/linux-renesas/0035-arm-Make-cpufreq-policy-notifier-usable-for-frequenc.patch')
| -rw-r--r-- | meta-eas/recipes-kernel/linux/linux-renesas/0035-arm-Make-cpufreq-policy-notifier-usable-for-frequenc.patch | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/meta-eas/recipes-kernel/linux/linux-renesas/0035-arm-Make-cpufreq-policy-notifier-usable-for-frequenc.patch b/meta-eas/recipes-kernel/linux/linux-renesas/0035-arm-Make-cpufreq-policy-notifier-usable-for-frequenc.patch new file mode 100644 index 0000000..7a004f0 --- /dev/null +++ b/meta-eas/recipes-kernel/linux/linux-renesas/0035-arm-Make-cpufreq-policy-notifier-usable-for-frequenc.patch @@ -0,0 +1,83 @@ +From e869e7130e9fcb8b44fd20b11ba4eee166f3f958 Mon Sep 17 00:00:00 2001 +From: Dietmar Eggemann <dietmar.eggemann@arm.com> +Date: Mon, 21 Nov 2016 16:42:17 +0000 +Subject: [PATCH 35/92] arm: Make cpufreq policy notifier usable for + frequency-invariant load-tracking support + +The maximum supported frequency of a cpu (policy->cpuinfo.max_freq) has +to be retrieved for frequency-invariant load-tracking. + +This can be achieved by coding this functionality into the existing +cpufreq policy notifier (init_cpu_capacity_notifier) which is currently +only used for setting up dt-based cpu capacities (cpu node property +capacity-dmips-mhz). + +But frequency-invariant load-tracking has to work whether cpu capacity +dt-parsing succeeded or not. + +Change init_cpu_capacity_notifier in such a way that even if the parsing +of the cpu capacity information failed the notifier is called for each +cpufreq policy to be able to set the maximum supported frequency. + +The continue statement in init_cpu_capacity_callback() makes sure that we +don't go on calculating cap_scale in case the capacity parsing failed. The +whole implementation makes only sense as soon the code to set the per-cpu +variable max_freq is introduced by the following patch ("arm: +Frequency-invariant load-tracking support"). + +Cc: Russell King <linux@arm.linux.org.uk> +Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com> +(cherry picked from commit e47eb4cac39817612543425e7d64cd30a6baf684) +Signed-off-by: Gaku Inami <gaku.inami.xw@bp.renesas.com> +--- + arch/arm/kernel/topology.c | 15 ++++++++------- + 1 file changed, 8 insertions(+), 7 deletions(-) + +diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c +index f0957f3..b030d01 100644 +--- a/arch/arm/kernel/topology.c ++++ b/arch/arm/kernel/topology.c +@@ -228,7 +228,7 @@ static void normalize_cpu_capacity(void) + struct cpufreq_policy *policy = data; + int cpu; + +- if (cap_parsing_failed || cap_parsing_done) ++ if (cap_parsing_done) + return 0; + + switch (val) { +@@ -240,14 +240,18 @@ static void normalize_cpu_capacity(void) + cpus_to_visit, + policy->related_cpus); + for_each_cpu(cpu, policy->related_cpus) { ++ if (cap_parsing_failed) ++ continue; + raw_capacity[cpu] = arch_scale_cpu_capacity(NULL, cpu) * + policy->cpuinfo.max_freq / 1000UL; + capacity_scale = max(raw_capacity[cpu], capacity_scale); + } + if (cpumask_empty(cpus_to_visit)) { +- normalize_cpu_capacity(); +- kfree(raw_capacity); +- pr_debug("cpu_capacity: parsing done\n"); ++ if (!cap_parsing_failed) { ++ normalize_cpu_capacity(); ++ kfree(raw_capacity); ++ } ++ pr_debug("cpu_capacity: parsing done"); + cap_parsing_done = true; + schedule_work(&parsing_done_work); + } +@@ -261,9 +265,6 @@ static void normalize_cpu_capacity(void) + + static int __init register_cpufreq_notifier(void) + { +- if (cap_parsing_failed) +- return -EINVAL; +- + if (!alloc_cpumask_var(&cpus_to_visit, GFP_KERNEL)) { + pr_err("cpu_capacity: failed to allocate memory for cpus_to_visit\n"); + return -ENOMEM; +-- +1.9.1 + |