Merge tag 'pm-extra-4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
authorLinus Torvalds <torvalds@linux-foundation.org>
Fri, 14 Oct 2016 19:46:13 +0000 (12:46 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 14 Oct 2016 19:46:13 +0000 (12:46 -0700)
Pull more power management updates from Rafael Wysocki:
 "This includes a couple of fixes for cpufreq regressions introduced in
  4.8, a rework of the intel_pstate algorithm used on Atom processors
  (that took some time to test) plus a fix and a couple of cleanups in
  that driver, a CPPC cpufreq driver fix, and a some devfreq fixes and
  cleanups (core and exynos-nocp).

  Specifics:

   - Fix two cpufreq regressions causing undesirable changes in behavior
     to appear (one in the core and one in the conservative governor)
     introduced during the 4.8 cycle (Aaro Koskinen, Rafael Wysocki).

   - Fix the way the intel_pstate driver accesses MSRs related to the
     hardware-managed P-states (HWP) feature during the initialization
     which currently is unsafe and may cause the processor to generate a
     general protection fault (Srinivas Pandruvada).

   - Rework the intel_pstate's P-state selection algorithm used on Atom
     processors to avoid known problems with the current one and to make
     the computation more straightforward, which also happens to improve
     performance in multiple benchmarks a bit (Rafael Wysocki).

   - Improve two comments in the intel_pstate driver (Rafael Wysocki).

   - Fix the desired performance computation in the CPPC cpufreq driver
     (Hoan Tran).

   - Fix the devfreq core to avoid printing misleading error messages in
     some cases (Tobias Jakobi).

   - Fix the error code path in devfreq_add_device() to use proper
     locking around list modifications (Axel Lin).

   - Fix a build failure and remove a couple of redundant updates of
     variables in the exynos-nocp devfreq driver (Axel Lin)"

* tag 'pm-extra-4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  cpufreq: CPPC: Correct desired_perf calculation
  cpufreq: conservative: Fix next frequency selection
  cpufreq: skip invalid entries when searching the frequency
  cpufreq: intel_pstate: Fix struct pstate_adjust_policy kerneldoc
  cpufreq: intel_pstate: Proportional algorithm for Atom
  PM / devfreq: Skip status update on uninitialized previous_freq
  PM / devfreq: Add proper locking around list_del()
  PM / devfreq: exynos-nocp: Remove redundant code
  PM / devfreq: exynos-nocp: Select REGMAP_MMIO
  cpufreq: intel_pstate: Clarify comment in get_target_pstate_use_performance()
  cpufreq: intel_pstate: Fix unsafe HWP MSR access

drivers/cpufreq/cppc_cpufreq.c
drivers/cpufreq/cpufreq_conservative.c
drivers/cpufreq/intel_pstate.c
drivers/devfreq/devfreq.c
drivers/devfreq/event/Kconfig
drivers/devfreq/event/exynos-nocp.c
include/linux/cpufreq.h

index 1b2f28f69a8142fce5edcd02c2f85f2e4f0c4a72..4852d9efe74e7c470169b25babbb3355e8a5a0b6 100644 (file)
@@ -80,11 +80,17 @@ static int cppc_cpufreq_set_target(struct cpufreq_policy *policy,
 {
        struct cppc_cpudata *cpu;
        struct cpufreq_freqs freqs;
+       u32 desired_perf;
        int ret = 0;
 
        cpu = all_cpu_data[policy->cpu];
 
-       cpu->perf_ctrls.desired_perf = (u64)target_freq * policy->max / cppc_dmi_max_khz;
+       desired_perf = (u64)target_freq * cpu->perf_caps.highest_perf / cppc_dmi_max_khz;
+       /* Return if it is exactly the same perf */
+       if (desired_perf == cpu->perf_ctrls.desired_perf)
+               return ret;
+
+       cpu->perf_ctrls.desired_perf = desired_perf;
        freqs.old = policy->cur;
        freqs.new = target_freq;
 
index 18da4f8051d372d06eb74e68e591f57e40569c82..13475890d792d7bb24209a8fa8617f011883e660 100644 (file)
@@ -17,6 +17,7 @@
 struct cs_policy_dbs_info {
        struct policy_dbs_info policy_dbs;
        unsigned int down_skip;
+       unsigned int requested_freq;
 };
 
 static inline struct cs_policy_dbs_info *to_dbs_info(struct policy_dbs_info *policy_dbs)
@@ -61,6 +62,7 @@ static unsigned int cs_dbs_timer(struct cpufreq_policy *policy)
 {
        struct policy_dbs_info *policy_dbs = policy->governor_data;
        struct cs_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs);
+       unsigned int requested_freq = dbs_info->requested_freq;
        struct dbs_data *dbs_data = policy_dbs->dbs_data;
        struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
        unsigned int load = dbs_update(policy);
@@ -72,10 +74,16 @@ static unsigned int cs_dbs_timer(struct cpufreq_policy *policy)
        if (cs_tuners->freq_step == 0)
                goto out;
 
+       /*
+        * If requested_freq is out of range, it is likely that the limits
+        * changed in the meantime, so fall back to current frequency in that
+        * case.
+        */
+       if (requested_freq > policy->max || requested_freq < policy->min)
+               requested_freq = policy->cur;
+
        /* Check for frequency increase */
        if (load > dbs_data->up_threshold) {
-               unsigned int requested_freq = policy->cur;
-
                dbs_info->down_skip = 0;
 
                /* if we are already at full speed then break out early */
@@ -83,8 +91,11 @@ static unsigned int cs_dbs_timer(struct cpufreq_policy *policy)
                        goto out;
 
                requested_freq += get_freq_target(cs_tuners, policy);
+               if (requested_freq > policy->max)
+                       requested_freq = policy->max;
 
                __cpufreq_driver_target(policy, requested_freq, CPUFREQ_RELATION_H);
+               dbs_info->requested_freq = requested_freq;
                goto out;
        }
 
@@ -95,7 +106,7 @@ static unsigned int cs_dbs_timer(struct cpufreq_policy *policy)
 
        /* Check for frequency decrease */
        if (load < cs_tuners->down_threshold) {
-               unsigned int freq_target, requested_freq = policy->cur;
+               unsigned int freq_target;
                /*
                 * if we cannot reduce the frequency anymore, break out early
                 */
@@ -109,6 +120,7 @@ static unsigned int cs_dbs_timer(struct cpufreq_policy *policy)
                        requested_freq = policy->min;
 
                __cpufreq_driver_target(policy, requested_freq, CPUFREQ_RELATION_L);
+               dbs_info->requested_freq = requested_freq;
        }
 
  out:
@@ -287,6 +299,7 @@ static void cs_start(struct cpufreq_policy *policy)
        struct cs_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data);
 
        dbs_info->down_skip = 0;
+       dbs_info->requested_freq = policy->cur;
 }
 
 static struct dbs_governor cs_governor = {
index 806f2039571e56ec69bd2cad697f788821826c1a..f535f812325841a683d5691fc61bd89860681229 100644 (file)
@@ -225,7 +225,7 @@ struct cpudata {
 static struct cpudata **all_cpu_data;
 
 /**
- * struct pid_adjust_policy - Stores static PID configuration data
+ * struct pstate_adjust_policy - Stores static PID configuration data
  * @sample_rate_ms:    PID calculation sample rate in ms
  * @sample_rate_ns:    Sample rate calculation in ns
  * @deadband:          PID deadband
@@ -562,12 +562,12 @@ static void intel_pstate_hwp_set(const struct cpumask *cpumask)
        int min, hw_min, max, hw_max, cpu, range, adj_range;
        u64 value, cap;
 
-       rdmsrl(MSR_HWP_CAPABILITIES, cap);
-       hw_min = HWP_LOWEST_PERF(cap);
-       hw_max = HWP_HIGHEST_PERF(cap);
-       range = hw_max - hw_min;
-
        for_each_cpu(cpu, cpumask) {
+               rdmsrl_on_cpu(cpu, MSR_HWP_CAPABILITIES, &cap);
+               hw_min = HWP_LOWEST_PERF(cap);
+               hw_max = HWP_HIGHEST_PERF(cap);
+               range = hw_max - hw_min;
+
                rdmsrl_on_cpu(cpu, MSR_HWP_REQUEST, &value);
                adj_range = limits->min_perf_pct * range / 100;
                min = hw_min + adj_range;
@@ -1232,6 +1232,7 @@ static inline int32_t get_target_pstate_use_cpu_load(struct cpudata *cpu)
 {
        struct sample *sample = &cpu->sample;
        int32_t busy_frac, boost;
+       int target, avg_pstate;
 
        busy_frac = div_fp(sample->mperf, sample->tsc);
 
@@ -1242,7 +1243,26 @@ static inline int32_t get_target_pstate_use_cpu_load(struct cpudata *cpu)
                busy_frac = boost;
 
        sample->busy_scaled = busy_frac * 100;
-       return get_avg_pstate(cpu) - pid_calc(&cpu->pid, sample->busy_scaled);
+
+       target = limits->no_turbo || limits->turbo_disabled ?
+                       cpu->pstate.max_pstate : cpu->pstate.turbo_pstate;
+       target += target >> 2;
+       target = mul_fp(target, busy_frac);
+       if (target < cpu->pstate.min_pstate)
+               target = cpu->pstate.min_pstate;
+
+       /*
+        * If the average P-state during the previous cycle was higher than the
+        * current target, add 50% of the difference to the target to reduce
+        * possible performance oscillations and offset possible performance
+        * loss related to moving the workload from one CPU to another within
+        * a package/module.
+        */
+       avg_pstate = get_avg_pstate(cpu);
+       if (avg_pstate > target)
+               target += (avg_pstate - target) >> 1;
+
+       return target;
 }
 
 static inline int32_t get_target_pstate_use_performance(struct cpudata *cpu)
@@ -1251,10 +1271,11 @@ static inline int32_t get_target_pstate_use_performance(struct cpudata *cpu)
        u64 duration_ns;
 
        /*
-        * perf_scaled is the average performance during the last sampling
-        * period scaled by the ratio of the maximum P-state to the P-state
-        * requested last time (in percent).  That measures the system's
-        * response to the previous P-state selection.
+        * perf_scaled is the ratio of the average P-state during the last
+        * sampling period to the P-state requested last time (in percent).
+        *
+        * That measures the system's response to the previous P-state
+        * selection.
         */
        max_pstate = cpu->pstate.max_pstate_physical;
        current_pstate = cpu->pstate.current_pstate;
index 478006b7764a5919259e8b582dedfd3a1f5358f5..bf3ea7603a58a9705d51feb271a61507f5c779e9 100644 (file)
@@ -137,6 +137,10 @@ static int devfreq_update_status(struct devfreq *devfreq, unsigned long freq)
 
        cur_time = jiffies;
 
+       /* Immediately exit if previous_freq is not initialized yet. */
+       if (!devfreq->previous_freq)
+               goto out;
+
        prev_lev = devfreq_get_freq_level(devfreq, devfreq->previous_freq);
        if (prev_lev < 0) {
                ret = prev_lev;
@@ -594,17 +598,19 @@ struct devfreq *devfreq_add_device(struct device *dev,
        if (devfreq->governor)
                err = devfreq->governor->event_handler(devfreq,
                                        DEVFREQ_GOV_START, NULL);
-       mutex_unlock(&devfreq_list_lock);
        if (err) {
                dev_err(dev, "%s: Unable to start governor for the device\n",
                        __func__);
                goto err_init;
        }
+       mutex_unlock(&devfreq_list_lock);
 
        return devfreq;
 
 err_init:
        list_del(&devfreq->node);
+       mutex_unlock(&devfreq_list_lock);
+
        device_unregister(&devfreq->dev);
 err_out:
        return ERR_PTR(err);
index 0fdae86089613fe130d35246318fe75d41a755c5..cd949800eed962cffa34b599d3ce66f386763d11 100644 (file)
@@ -17,6 +17,7 @@ config DEVFREQ_EVENT_EXYNOS_NOCP
        tristate "EXYNOS NoC (Network On Chip) Probe DEVFREQ event Driver"
        depends on ARCH_EXYNOS || COMPILE_TEST
        select PM_OPP
+       select REGMAP_MMIO
        help
          This add the devfreq-event driver for Exynos SoC. It provides NoC
          (Network on Chip) Probe counters to measure the bandwidth of AXI bus.
index a5841403bde8b64c314c921148b6189d7dcef82f..49e712aca0c15367e2168d91a3542cdb6ff2ff5b 100644 (file)
@@ -176,9 +176,6 @@ static int exynos_nocp_get_event(struct devfreq_event_dev *edev,
        return 0;
 
 out:
-       edata->load_count = 0;
-       edata->total_count = 0;
-
        dev_err(nocp->dev, "Failed to read the counter of NoC probe device\n");
 
        return ret;
index 631ba33bbe9fdb2fe0fd3f73cb1ab1773b52f617..5fa55fc56e18d1971da8c2e031c35a17fe0d51fc 100644 (file)
@@ -639,19 +639,19 @@ static inline int cpufreq_table_find_index_al(struct cpufreq_policy *policy,
                                              unsigned int target_freq)
 {
        struct cpufreq_frequency_table *table = policy->freq_table;
+       struct cpufreq_frequency_table *pos, *best = table - 1;
        unsigned int freq;
-       int i, best = -1;
 
-       for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
-               freq = table[i].frequency;
+       cpufreq_for_each_valid_entry(pos, table) {
+               freq = pos->frequency;
 
                if (freq >= target_freq)
-                       return i;
+                       return pos - table;
 
-               best = i;
+               best = pos;
        }
 
-       return best;
+       return best - table;
 }
 
 /* Find lowest freq at or above target in a table in descending order */
@@ -659,28 +659,28 @@ static inline int cpufreq_table_find_index_dl(struct cpufreq_policy *policy,
                                              unsigned int target_freq)
 {
        struct cpufreq_frequency_table *table = policy->freq_table;
+       struct cpufreq_frequency_table *pos, *best = table - 1;
        unsigned int freq;
-       int i, best = -1;
 
-       for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
-               freq = table[i].frequency;
+       cpufreq_for_each_valid_entry(pos, table) {
+               freq = pos->frequency;
 
                if (freq == target_freq)
-                       return i;
+                       return pos - table;
 
                if (freq > target_freq) {
-                       best = i;
+                       best = pos;
                        continue;
                }
 
                /* No freq found above target_freq */
-               if (best == -1)
-                       return i;
+               if (best == table - 1)
+                       return pos - table;
 
-               return best;
+               return best - pos;
        }
 
-       return best;
+       return best - pos;
 }
 
 /* Works only on sorted freq-tables */
@@ -700,28 +700,28 @@ static inline int cpufreq_table_find_index_ah(struct cpufreq_policy *policy,
                                              unsigned int target_freq)
 {
        struct cpufreq_frequency_table *table = policy->freq_table;
+       struct cpufreq_frequency_table *pos, *best = table - 1;
        unsigned int freq;
-       int i, best = -1;
 
-       for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
-               freq = table[i].frequency;
+       cpufreq_for_each_valid_entry(pos, table) {
+               freq = pos->frequency;
 
                if (freq == target_freq)
-                       return i;
+                       return pos - table;
 
                if (freq < target_freq) {
-                       best = i;
+                       best = pos;
                        continue;
                }
 
                /* No freq found below target_freq */
-               if (best == -1)
-                       return i;
+               if (best == table - 1)
+                       return pos - table;
 
-               return best;
+               return best - table;
        }
 
-       return best;
+       return best - table;
 }
 
 /* Find highest freq at or below target in a table in descending order */
@@ -729,19 +729,19 @@ static inline int cpufreq_table_find_index_dh(struct cpufreq_policy *policy,
                                              unsigned int target_freq)
 {
        struct cpufreq_frequency_table *table = policy->freq_table;
+       struct cpufreq_frequency_table *pos, *best = table - 1;
        unsigned int freq;
-       int i, best = -1;
 
-       for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
-               freq = table[i].frequency;
+       cpufreq_for_each_valid_entry(pos, table) {
+               freq = pos->frequency;
 
                if (freq <= target_freq)
-                       return i;
+                       return pos - table;
 
-               best = i;
+               best = pos;
        }
 
-       return best;
+       return best - table;
 }
 
 /* Works only on sorted freq-tables */
@@ -761,32 +761,32 @@ static inline int cpufreq_table_find_index_ac(struct cpufreq_policy *policy,
                                              unsigned int target_freq)
 {
        struct cpufreq_frequency_table *table = policy->freq_table;
+       struct cpufreq_frequency_table *pos, *best = table - 1;
        unsigned int freq;
-       int i, best = -1;
 
-       for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
-               freq = table[i].frequency;
+       cpufreq_for_each_valid_entry(pos, table) {
+               freq = pos->frequency;
 
                if (freq == target_freq)
-                       return i;
+                       return pos - table;
 
                if (freq < target_freq) {
-                       best = i;
+                       best = pos;
                        continue;
                }
 
                /* No freq found below target_freq */
-               if (best == -1)
-                       return i;
+               if (best == table - 1)
+                       return pos - table;
 
                /* Choose the closest freq */
-               if (target_freq - table[best].frequency > freq - target_freq)
-                       return i;
+               if (target_freq - best->frequency > freq - target_freq)
+                       return pos - table;
 
-               return best;
+               return best - table;
        }
 
-       return best;
+       return best - table;
 }
 
 /* Find closest freq to target in a table in descending order */
@@ -794,32 +794,32 @@ static inline int cpufreq_table_find_index_dc(struct cpufreq_policy *policy,
                                              unsigned int target_freq)
 {
        struct cpufreq_frequency_table *table = policy->freq_table;
+       struct cpufreq_frequency_table *pos, *best = table - 1;
        unsigned int freq;
-       int i, best = -1;
 
-       for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
-               freq = table[i].frequency;
+       cpufreq_for_each_valid_entry(pos, table) {
+               freq = pos->frequency;
 
                if (freq == target_freq)
-                       return i;
+                       return pos - table;
 
                if (freq > target_freq) {
-                       best = i;
+                       best = pos;
                        continue;
                }
 
                /* No freq found above target_freq */
-               if (best == -1)
-                       return i;
+               if (best == table - 1)
+                       return pos - table;
 
                /* Choose the closest freq */
-               if (table[best].frequency - target_freq > target_freq - freq)
-                       return i;
+               if (best->frequency - target_freq > target_freq - freq)
+                       return pos - table;
 
-               return best;
+               return best - table;
        }
 
-       return best;
+       return best - table;
 }
 
 /* Works only on sorted freq-tables */