Merge back earlier cpufreq material for 7.1

Author: rafaeljw

drivers/acpi/cppc_acpi.c

@@ -1944,7 +1944,7 @@ static void cppc_find_dmi_mhz(const struct dmi_header *dm, void *private)
 }
 
 /* Look up the max frequency in DMI */
-static u64 cppc_get_dmi_max_khz(void)
+u64 cppc_get_dmi_max_khz(void)
 {
 	u16 mhz = 0;
 
@@ -1958,6 +1958,7 @@ static u64 cppc_get_dmi_max_khz(void)
 
 	return KHZ_PER_MHZ * mhz;
 }
+EXPORT_SYMBOL_GPL(cppc_get_dmi_max_khz);
 
 /*
  * If CPPC lowest_freq and nominal_freq registers are exposed then we can

drivers/cpufreq/acpi-cpufreq.c

@@ -675,6 +675,29 @@ static inline u64 get_max_boost_ratio(unsigned int cpu, u64 *nominal_freq)
 }
 #endif
 
+static void acpi_cpufreq_resolve_max_freq(struct cpufreq_policy *policy,
+					  unsigned int pss_max_freq)
+{
+#ifdef CONFIG_ACPI_CPPC_LIB
+	u64 max_speed = cppc_get_dmi_max_khz();
+	/*
+	 * Use DMI "Max Speed" if it looks plausible: must be
+	 * above _PSS P0 frequency and within 2x of it.
+	 */
+	if (max_speed > pss_max_freq && max_speed < pss_max_freq * 2) {
+		policy->cpuinfo.max_freq = max_speed;
+		return;
+	}
+#endif
+	/*
+	 * If the maximum "boost" frequency is unknown, ask the arch
+	 * scale-invariance code to use the "nominal" performance for
+	 * CPU utilization scaling so as to prevent the schedutil
+	 * governor from selecting inadequate CPU frequencies.
+	 */
+	arch_set_max_freq_ratio(true);
+}
+
 static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
 {
 	struct cpufreq_frequency_table *freq_table;
@@ -849,13 +872,7 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
 
 		policy->cpuinfo.max_freq = freq * max_boost_ratio >> SCHED_CAPACITY_SHIFT;
 	} else {
-		/*
-		 * If the maximum "boost" frequency is unknown, ask the arch
-		 * scale-invariance code to use the "nominal" performance for
-		 * CPU utilization scaling so as to prevent the schedutil
-		 * governor from selecting inadequate CPU frequencies.
-		 */
-		arch_set_max_freq_ratio(true);
+		acpi_cpufreq_resolve_max_freq(policy, freq_table[0].frequency);
 	}
 
 	policy->freq_table = freq_table;

drivers/cpufreq/cpufreq.c

@@ -2364,8 +2364,8 @@ int __cpufreq_driver_target(struct cpufreq_policy *policy,
 	target_freq = __resolve_freq(policy, target_freq, policy->min,
 				     policy->max, relation);
 
-	pr_debug("target for CPU %u: %u kHz, relation %u, requested %u kHz\n",
-		 policy->cpu, target_freq, relation, old_target_freq);
+	pr_debug("CPU %u: cur %u kHz -> target %u kHz (req %u kHz, rel %u)\n",
+		policy->cpu, policy->cur, target_freq, old_target_freq, relation);
 
 	/*
 	 * This might look like a redundant call as we are checking it again

drivers/cpufreq/cpufreq_governor.h

@@ -21,6 +21,7 @@
 #include <linux/kernel_stat.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
+#include <linux/sysfs.h>
 
 /* Ondemand Sampling types */
 enum {OD_NORMAL_SAMPLE, OD_SUB_SAMPLE};
@@ -57,15 +58,15 @@ static ssize_t file_name##_show						\
 {									\
 	struct dbs_data *dbs_data = to_dbs_data(attr_set);		\
 	struct _gov##_dbs_tuners *tuners = dbs_data->tuners;		\
-	return sprintf(buf, "%u\n", tuners->file_name);			\
+	return sysfs_emit(buf, "%u\n", tuners->file_name);		\
 }
 
 #define gov_show_one_common(file_name)					\
 static ssize_t file_name##_show						\
 (struct gov_attr_set *attr_set, char *buf)				\
 {									\
 	struct dbs_data *dbs_data = to_dbs_data(attr_set);		\
-	return sprintf(buf, "%u\n", dbs_data->file_name);		\
+	return sysfs_emit(buf, "%u\n", dbs_data->file_name);		\
 }
 
 #define gov_attr_ro(_name)						\

drivers/cpufreq/intel_pstate.c

@@ -3472,7 +3472,7 @@ static int intel_pstate_update_status(const char *buf, size_t size)
 {
 	if (size == 3 && !strncmp(buf, "off", size)) {
 		if (!intel_pstate_driver)
-			return -EINVAL;
+			return 0;
 
 		if (hwp_active)
 			return -EBUSY;

include/acpi/cppc_acpi.h

@@ -156,6 +156,7 @@ extern int cppc_set_enable(int cpu, bool enable);
 extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps);
 extern bool cppc_perf_ctrs_in_pcc_cpu(unsigned int cpu);
 extern bool cppc_perf_ctrs_in_pcc(void);
+extern u64 cppc_get_dmi_max_khz(void);
 extern unsigned int cppc_perf_to_khz(struct cppc_perf_caps *caps, unsigned int perf);
 extern unsigned int cppc_khz_to_perf(struct cppc_perf_caps *caps, unsigned int freq);
 extern bool acpi_cpc_valid(void);

include/linux/cpufreq.h

@@ -232,7 +232,7 @@ static inline bool policy_is_inactive(struct cpufreq_policy *policy)
 
 static inline bool policy_is_shared(struct cpufreq_policy *policy)
 {
-	return cpumask_weight(policy->cpus) > 1;
+	return cpumask_nth(1, policy->cpus) < nr_cpumask_bits;
 }
 
 #ifdef CONFIG_CPU_FREQ