[PATCHv2.99 04/11] cpufreq: Define ADAPTIVE frequency governor policy.

[Francisco Jerez <currojerez@riseup.net>]

This defines a generic policy in addition to the existing PERFORMANCE
and POWERSAVE policies.  The ADAPTIVE policy is expected to provide a
variable trade-off between performance and energy efficiency based on
the dynamic behavior of the workload -- E.g. whether the system has a
bottleneck on the CPU or another IO device.

Signed-off-by: Francisco Jerez <currojerez@riseup.net>
---
 drivers/cpufreq/cpufreq.c | 10 ++++++++--
 drivers/cpufreq/longrun.c |  1 +
 include/linux/cpufreq.h   |  1 +
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 045f9fe157ce..e87285b6294c 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -629,6 +629,9 @@ static unsigned int cpufreq_parse_policy(char *str_governor)
 	if (!strncasecmp(str_governor, "powersave", CPUFREQ_NAME_LEN))
 		return CPUFREQ_POLICY_POWERSAVE;
 
+	if (!strncasecmp(str_governor, "adaptive", CPUFREQ_NAME_LEN))
+		return CPUFREQ_POLICY_ADAPTIVE;
+
 	return CPUFREQ_POLICY_UNKNOWN;
 }
 
@@ -750,6 +753,8 @@ static ssize_t show_scaling_governor(struct cpufreq_policy *policy, char *buf)
 		return sprintf(buf, "powersave\n");
 	else if (policy->policy == CPUFREQ_POLICY_PERFORMANCE)
 		return sprintf(buf, "performance\n");
+	else if (policy->policy == CPUFREQ_POLICY_ADAPTIVE)
+		return sprintf(buf, "adaptive\n");
 	else if (policy->governor)
 		return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n",
 				policy->governor->name);
@@ -811,7 +816,7 @@ static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy,
 	struct cpufreq_governor *t;
 
 	if (!has_target()) {
-		i += sprintf(buf, "performance powersave");
+		i += sprintf(buf, "performance powersave adaptive");
 		goto out;
 	}
 
@@ -1085,7 +1090,8 @@ static int cpufreq_init_policy(struct cpufreq_policy *policy)
 				pol = policy->policy;
 		}
 		if (pol != CPUFREQ_POLICY_PERFORMANCE &&
-		    pol != CPUFREQ_POLICY_POWERSAVE)
+		    pol != CPUFREQ_POLICY_POWERSAVE &&
+		    pol != CPUFREQ_POLICY_ADAPTIVE)
 			return -ENODATA;
 	}
 
diff --git a/drivers/cpufreq/longrun.c b/drivers/cpufreq/longrun.c
index 1caaec7c280b..cb70f0b7ff7a 100644
--- a/drivers/cpufreq/longrun.c
+++ b/drivers/cpufreq/longrun.c
@@ -99,6 +99,7 @@ static int longrun_set_policy(struct cpufreq_policy *policy)
 		msr_lo |= 0x00000001;
 		break;
 	case CPUFREQ_POLICY_POWERSAVE:
+	case CPUFREQ_POLICY_ADAPTIVE:
 		break;
 	}
 	wrmsr(MSR_TMTA_LONGRUN_FLAGS, msr_lo, msr_hi);
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index f7240251a949..fa63df914f9f 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -536,6 +536,7 @@ static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
  */
 #define CPUFREQ_POLICY_POWERSAVE	(1)
 #define CPUFREQ_POLICY_PERFORMANCE	(2)
+#define CPUFREQ_POLICY_ADAPTIVE 	(3)
 
 /*
  * The polling frequency depends on the capability of the processor. Default
-- 
2.22.1