From 366430b5c2f61a75d45b9fc00886ffff12f395ab Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Sat, 24 Dec 2016 00:29:56 +0100 Subject: cpufreq: intel_pstate: Do not expose PID parameters in passive mode If intel_pstate works in the passive mode in which it acts as a regular cpufreq driver and collaborates with generic cpufreq governors, the PID parameters are not used, so do not expose them via debugfs in that case. Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/intel_pstate.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) (limited to 'drivers/cpufreq') diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 7cd0177ddeaf..0d01cb2dc6d2 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -964,10 +964,6 @@ static void __init intel_pstate_debug_expose_params(void) struct dentry *debugfs_parent; int i = 0; - if (hwp_active || - pstate_funcs.get_target_pstate == get_target_pstate_use_cpu_load) - return; - debugfs_parent = debugfs_create_dir("pstate_snb", NULL); if (IS_ERR_OR_NULL(debugfs_parent)) return; @@ -2433,7 +2429,10 @@ hwp_cpu_matched: if (rc) goto out; - intel_pstate_debug_expose_params(); + if (intel_pstate_driver == &intel_pstate && !hwp_active && + pstate_funcs.get_target_pstate != get_target_pstate_use_cpu_load) + intel_pstate_debug_expose_params(); + intel_pstate_sysfs_expose_params(); if (hwp_active) -- cgit v1.2.1 From aa439248ab71bcd2d26a01708dead4dd56616499 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Fri, 30 Dec 2016 15:56:14 +0100 Subject: cpufreq: intel_pstate: Use locking in intel_pstate_resume() Theoretically, intel_pstate_resume() may be executed in parallel with intel_pstate_set_policy(), if the latter is invoked via cpufreq_update_policy() as a result of a notification, so use intel_pstate_limits_lock in there too to avoid race conditions. Signed-off-by: Rafael J. Wysocki Acked-by: Srinivas Pandruvada --- drivers/cpufreq/intel_pstate.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) (limited to 'drivers/cpufreq') diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 0d01cb2dc6d2..dc457abb7dab 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -914,12 +914,20 @@ static int intel_pstate_hwp_save_state(struct cpufreq_policy *policy) static int intel_pstate_resume(struct cpufreq_policy *policy) { + int ret; + if (!hwp_active) return 0; + mutex_lock(&intel_pstate_limits_lock); + all_cpu_data[policy->cpu]->epp_policy = 0; - return intel_pstate_hwp_set_policy(policy); + ret = intel_pstate_hwp_set_policy(policy); + + mutex_unlock(&intel_pstate_limits_lock); + + return ret; } static void intel_pstate_hwp_set_online_cpus(void) -- cgit v1.2.1 From cad30467963267509d5b0d7d3c9bd1af3b91e720 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Fri, 30 Dec 2016 15:57:11 +0100 Subject: cpufreq: intel_pstate: Use locking in intel_cpufreq_verify_policy() Race conditions are possible if intel_cpufreq_verify_policy() is executed in parallel with global limits updates from sysfs, so the invocation of intel_pstate_update_perf_limits() in it should be carried out under intel_pstate_limits_lock. Make that happen. Signed-off-by: Rafael J. Wysocki Acked-by: Srinivas Pandruvada --- drivers/cpufreq/intel_pstate.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'drivers/cpufreq') diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index dc457abb7dab..f8e514d7fbc4 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -2103,8 +2103,12 @@ static int intel_cpufreq_verify_policy(struct cpufreq_policy *policy) if (per_cpu_limits) perf_limits = cpu->perf_limits; + mutex_lock(&intel_pstate_limits_lock); + intel_pstate_update_perf_limits(policy, perf_limits); + mutex_unlock(&intel_pstate_limits_lock); + return 0; } -- cgit v1.2.1 From 111b8b3fe4fae35d4a85e9f524b077f5c4951e65 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Fri, 30 Dec 2016 15:58:21 +0100 Subject: cpufreq: intel_pstate: Always keep all limits settings in sync Make intel_pstate update per-logical-CPU limits when the global settings are changed to ensure that they are always in sync and users will not see confusing values in per-logical-CPU sysfs attributes. This also fixes the problem that setting the "no_turbo" global attribute to 1 in the "passive" mode (ie. when intel_pstate acts as a regular cpufreq driver) when scaling_governor is set to "performance" has no effect. Signed-off-by: Rafael J. Wysocki Acked-by: Srinivas Pandruvada --- drivers/cpufreq/intel_pstate.c | 30 ++++++++++++++---------------- 1 file changed, 14 insertions(+), 16 deletions(-) (limited to 'drivers/cpufreq') diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index f8e514d7fbc4..e261438cd690 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -803,13 +803,13 @@ static struct freq_attr *hwp_cpufreq_attrs[] = { NULL, }; -static void intel_pstate_hwp_set(const struct cpumask *cpumask) +static void intel_pstate_hwp_set(struct cpufreq_policy *policy) { int min, hw_min, max, hw_max, cpu, range, adj_range; struct perf_limits *perf_limits = limits; u64 value, cap; - for_each_cpu(cpu, cpumask) { + for_each_cpu(cpu, policy->cpus) { int max_perf_pct, min_perf_pct; struct cpudata *cpu_data = all_cpu_data[cpu]; s16 epp; @@ -895,7 +895,7 @@ skip_epp: static int intel_pstate_hwp_set_policy(struct cpufreq_policy *policy) { if (hwp_active) - intel_pstate_hwp_set(policy->cpus); + intel_pstate_hwp_set(policy); return 0; } @@ -930,11 +930,12 @@ static int intel_pstate_resume(struct cpufreq_policy *policy) return ret; } -static void intel_pstate_hwp_set_online_cpus(void) +static void intel_pstate_update_policies(void) { - get_online_cpus(); - intel_pstate_hwp_set(cpu_online_mask); - put_online_cpus(); + int cpu; + + for_each_possible_cpu(cpu) + cpufreq_update_policy(cpu); } /************************** debugfs begin ************************/ @@ -1055,11 +1056,10 @@ static ssize_t store_no_turbo(struct kobject *a, struct attribute *b, limits->no_turbo = clamp_t(int, input, 0, 1); - if (hwp_active) - intel_pstate_hwp_set_online_cpus(); - mutex_unlock(&intel_pstate_limits_lock); + intel_pstate_update_policies(); + return count; } @@ -1084,11 +1084,10 @@ static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b, limits->max_perf_pct); limits->max_perf = div_ext_fp(limits->max_perf_pct, 100); - if (hwp_active) - intel_pstate_hwp_set_online_cpus(); - mutex_unlock(&intel_pstate_limits_lock); + intel_pstate_update_policies(); + return count; } @@ -1113,11 +1112,10 @@ static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b, limits->min_perf_pct); limits->min_perf = div_ext_fp(limits->min_perf_pct, 100); - if (hwp_active) - intel_pstate_hwp_set_online_cpus(); - mutex_unlock(&intel_pstate_limits_lock); + intel_pstate_update_policies(); + return count; } -- cgit v1.2.1 From e11b6293a8fcd3f29376808910f49bd82f72b69a Mon Sep 17 00:00:00 2001 From: Hoan Tran Date: Thu, 15 Dec 2016 14:55:00 -0800 Subject: cpufreq: dt: Add support for APM X-Gene 2 Add the compatible string for supporting the generic device tree cpufreq-dt driver on APM's X-Gene 2 SoC. Signed-off-by: Hoan Tran Acked-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/cpufreq-dt-platdev.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/cpufreq') diff --git a/drivers/cpufreq/cpufreq-dt-platdev.c b/drivers/cpufreq/cpufreq-dt-platdev.c index bc97b6a4b1cf..7fcaf26e8f81 100644 --- a/drivers/cpufreq/cpufreq-dt-platdev.c +++ b/drivers/cpufreq/cpufreq-dt-platdev.c @@ -26,6 +26,8 @@ static const struct of_device_id machines[] __initconst = { { .compatible = "allwinner,sun8i-a83t", }, { .compatible = "allwinner,sun8i-h3", }, + { .compatible = "apm,xgene-shadowcat", }, + { .compatible = "arm,integrator-ap", }, { .compatible = "arm,integrator-cp", }, -- cgit v1.2.1