power: Use monotonic time for interaction boost

Using the wall clock will cause boosts to be disabled
when/if the clock is adjusted backward.

Bug: 29191415
Bug: 29208304
Change-Id: I8af5f40b46d996ce7bccb8324fc186e2f3a5b267
(cherry picked from commit 2bf13f822cf39123ee0e97e40caf1288ba4f457a)

9 files changed, 56 insertions, 48 deletions

diff --git a/power/power-8916.c b/power/power-8916.c
index 3ce1b84..dbae941 100644
--- a/power/power-8916.c
+++ b/power/power-8916.c
@@ -360,7 +360,9 @@ int power_hint_override(struct power_module *module __unused, power_hint_t hint,
 
     if (hint == POWER_HINT_INTERACTION) {
         int duration = 500, duration_hint = 0;
-        static unsigned long long previous_boost_time = 0;
+        static struct timespec s_previous_boost_timespec;
+        struct timespec cur_boost_timespec;
+        long long elapsed_time;
 
         if (data) {
             duration_hint = *((int *)data);
@@ -368,10 +370,8 @@ int power_hint_override(struct power_module *module __unused, power_hint_t hint,
 
         duration = duration_hint > 0 ? duration_hint : 500;
 
-        struct timeval cur_boost_timeval = {0, 0};
-        gettimeofday(&cur_boost_timeval, NULL);
-        unsigned long long cur_boost_time = cur_boost_timeval.tv_sec * 1000000 + cur_boost_timeval.tv_usec;
-        double elapsed_time = (double)(cur_boost_time - previous_boost_time);
+        clock_gettime(CLOCK_MONOTONIC, &cur_boost_timespec);
+        elapsed_time = calc_timespan_us(s_previous_boost_timespec, cur_boost_timespec);
         if (elapsed_time > 750000)
             elapsed_time = 750000;
         // don't hint if it's been less than 250ms since last boost
@@ -380,7 +380,7 @@ int power_hint_override(struct power_module *module __unused, power_hint_t hint,
         else if (elapsed_time < 250000 && duration <= 750)
             return HINT_HANDLED;
 
-        previous_boost_time = cur_boost_time;
+        s_previous_boost_timespec = cur_boost_timespec;
 
         if (duration >= 1500) {
             int resources[] = {
diff --git a/power/power-8937.c b/power/power-8937.c
index 02440a6..f2b4e7c 100644
--- a/power/power-8937.c
+++ b/power/power-8937.c
@@ -125,10 +125,9 @@ int  power_hint_override(struct power_module *module, power_hint_t hint,
         void *data)
 {
     int duration, duration_hint;
-    static unsigned long long previous_boost_time = 0;
-    unsigned long long cur_boost_time;
-    struct timeval cur_boost_timeval = {0, 0};
-    double elapsed_time;
+    static struct timespec s_previous_boost_timespec;
+    struct timespec cur_boost_timespec;
+    long long elapsed_time;
     int resources_launch_boost[] = {
         SCHED_BOOST_ON_V3, 0x1,
         MAX_FREQ_BIG_CORE_0, 0xFFF,
@@ -175,9 +174,8 @@ int  power_hint_override(struct power_module *module, power_hint_t hint,
 
             duration = duration_hint > 0 ? duration_hint : 500;
 
-            gettimeofday(&cur_boost_timeval, NULL);
-            cur_boost_time = cur_boost_timeval.tv_sec * 1000000 + cur_boost_timeval.tv_usec;
-            elapsed_time = (double)(cur_boost_time - previous_boost_time);
+            clock_gettime(CLOCK_MONOTONIC, &cur_boost_timespec);
+            elapsed_time = calc_timespan_us(s_previous_boost_timespec, cur_boost_timespec);
             if (elapsed_time > 750000)
                 elapsed_time = 750000;
             // don't hint if it's been less than 250ms since last boost
@@ -186,7 +184,7 @@ int  power_hint_override(struct power_module *module, power_hint_t hint,
             else if (elapsed_time < 250000 && duration <= 750)
                 return HINT_HANDLED;
 
-            previous_boost_time = cur_boost_time;
+            s_previous_boost_timespec = cur_boost_timespec;
 
             if (duration >= 1500) {
                 interaction(duration, ARRAY_SIZE(resources_interaction_fling_boost),
diff --git a/power/power-8952.c b/power/power-8952.c
index 05955d1..119a3de 100644
--- a/power/power-8952.c
+++ b/power/power-8952.c
@@ -107,10 +107,9 @@ int  power_hint_override(struct power_module *module, power_hint_t hint,
         void *data)
 {
     int duration, duration_hint;
-    static unsigned long long previous_boost_time = 0;
-    unsigned long long cur_boost_time;
-    struct timeval cur_boost_timeval = {0, 0};
-    double elapsed_time;
+    static struct timespec s_previous_boost_timespec;
+    struct timespec cur_boost_timespec;
+    long long elapsed_time;
     int resources_launch_boost[] = {
         ALL_CPUS_PWR_CLPS_DIS,
         SCHED_BOOST_ON,
@@ -153,9 +152,8 @@ int  power_hint_override(struct power_module *module, power_hint_t hint,
 
             duration = duration_hint > 0 ? duration_hint : 500;
 
-            gettimeofday(&cur_boost_timeval, NULL);
-            cur_boost_time = cur_boost_timeval.tv_sec * 1000000 + cur_boost_timeval.tv_usec;
-            elapsed_time = (double)(cur_boost_time - previous_boost_time);
+            clock_gettime(CLOCK_MONOTONIC, &cur_boost_timespec);
+            elapsed_time = calc_timespan_us(s_previous_boost_timespec, cur_boost_timespec);
             if (elapsed_time > 750000)
                 elapsed_time = 750000;
             // don't hint if it's been less than 250ms since last boost
@@ -164,7 +162,7 @@ int  power_hint_override(struct power_module *module, power_hint_t hint,
             else if (elapsed_time < 250000 && duration <= 750)
                 return HINT_HANDLED;
 
-            previous_boost_time = cur_boost_time;
+            s_previous_boost_timespec = cur_boost_timespec;
 
             if (duration >= 1500) {
                 interaction(duration, ARRAY_SIZE(resources_cpu_boost),
diff --git a/power/power-8974.c b/power/power-8974.c
index 0b6a4b3..02c9258 100644
--- a/power/power-8974.c
+++ b/power/power-8974.c
@@ -142,7 +142,9 @@ int power_hint_override(__attribute__((unused)) struct power_module *module,
 
     if (hint == POWER_HINT_INTERACTION) {
         int duration = 500, duration_hint = 0;
-        static unsigned long long previous_boost_time = 0;
+        static struct timespec s_previous_boost_timespec;
+        struct timespec cur_boost_timespec;
+        long long elapsed_time;
 
         if (data) {
             duration_hint = *((int *)data);
@@ -150,10 +152,8 @@ int power_hint_override(__attribute__((unused)) struct power_module *module,
 
         duration = duration_hint > 0 ? duration_hint : 500;
 
-        struct timeval cur_boost_timeval = {0, 0};
-        gettimeofday(&cur_boost_timeval, NULL);
-        unsigned long long cur_boost_time = cur_boost_timeval.tv_sec * 1000000 + cur_boost_timeval.tv_usec;
-        double elapsed_time = (double)(cur_boost_time - previous_boost_time);
+        clock_gettime(CLOCK_MONOTONIC, &cur_boost_timespec);
+        elapsed_time = calc_timespan_us(s_previous_boost_timespec, cur_boost_timespec);
         if (elapsed_time > 750000)
             elapsed_time = 750000;
         // don't hint if it's been less than 250ms since last boost
@@ -162,7 +162,7 @@ int power_hint_override(__attribute__((unused)) struct power_module *module,
         else if (elapsed_time < 250000 && duration <= 750)
             return HINT_HANDLED;
 
-        previous_boost_time = cur_boost_time;
+        s_previous_boost_timespec = cur_boost_timespec;
 
         int resources[] = { (duration >= 2000 ? CPUS_ONLINE_MIN_3 : CPUS_ONLINE_MIN_2),
             0x20F, 0x30F, 0x40F, 0x50F };
diff --git a/power/power-8992.c b/power/power-8992.c
index eee3443..879dae5 100644
--- a/power/power-8992.c
+++ b/power/power-8992.c
@@ -169,7 +169,9 @@ int power_hint_override(__attribute__((unused)) struct power_module *module,
 
     if (hint == POWER_HINT_INTERACTION) {
         int duration = 500, duration_hint = 0;
-        static unsigned long long previous_boost_time = 0;
+        static struct timespec s_previous_boost_timespec;
+        struct timespec cur_boost_timespec;
+        long long elapsed_time;
 
         if (data) {
             duration_hint = *((int *)data);
@@ -177,10 +179,8 @@ int power_hint_override(__attribute__((unused)) struct power_module *module,
 
         duration = duration_hint > 0 ? duration_hint : 500;
 
-        struct timeval cur_boost_timeval = {0, 0};
-        gettimeofday(&cur_boost_timeval, NULL);
-        unsigned long long cur_boost_time = cur_boost_timeval.tv_sec * 1000000 + cur_boost_timeval.tv_usec;
-        double elapsed_time = (double)(cur_boost_time - previous_boost_time);
+        clock_gettime(CLOCK_MONOTONIC, &cur_boost_timespec);
+        elapsed_time = calc_timespan_us(s_previous_boost_timespec, cur_boost_timespec);
         if (elapsed_time > 750000)
             elapsed_time = 750000;
         // don't hint if it's been less than 250ms since last boost
@@ -189,7 +189,7 @@ int power_hint_override(__attribute__((unused)) struct power_module *module,
         else if (elapsed_time < 250000 && duration <= 750)
             return HINT_HANDLED;
 
-        previous_boost_time = cur_boost_time;
+        s_previous_boost_timespec = cur_boost_timespec;
 
         if (duration >= 1500) {
             int resources[] = {
diff --git a/power/power-8994.c b/power/power-8994.c
index 3d93288..4a62826 100644
--- a/power/power-8994.c
+++ b/power/power-8994.c
@@ -179,7 +179,9 @@ int power_hint_override(__attribute__((unused)) struct power_module *module,
 
     if (hint == POWER_HINT_INTERACTION) {
         int duration = 500, duration_hint = 0;
-        static unsigned long long previous_boost_time = 0;
+        static struct timespec s_previous_boost_timespec;
+        struct timespec cur_boost_timespec;
+        long long elapsed_time;
 
         if (data) {
             duration_hint = *((int *)data);
@@ -187,10 +189,8 @@ int power_hint_override(__attribute__((unused)) struct power_module *module,
 
         duration = duration_hint > 0 ? duration_hint : 500;
 
-        struct timeval cur_boost_timeval = {0, 0};
-        gettimeofday(&cur_boost_timeval, NULL);
-        unsigned long long cur_boost_time = cur_boost_timeval.tv_sec * 1000000 + cur_boost_timeval.tv_usec;
-        double elapsed_time = (double)(cur_boost_time - previous_boost_time);
+        clock_gettime(CLOCK_MONOTONIC, &cur_boost_timespec);
+        elapsed_time = calc_timespan_us(s_previous_boost_timespec, cur_boost_timespec);
         if (elapsed_time > 750000)
             elapsed_time = 750000;
         // don't hint if it's been less than 250ms since last boost
@@ -199,7 +199,7 @@ int power_hint_override(__attribute__((unused)) struct power_module *module,
         else if (elapsed_time < 250000 && duration <= 750)
             return HINT_HANDLED;
 
-        previous_boost_time = cur_boost_time;
+        s_previous_boost_timespec = cur_boost_timespec;
 
         if (duration >= 1500) {
             int resources[] = {
diff --git a/power/power-8996.c b/power/power-8996.c
index 0e1bdf9..decced0 100644
--- a/power/power-8996.c
+++ b/power/power-8996.c
@@ -271,10 +271,9 @@ static int process_video_encode_hint(void *metadata)
 int power_hint_override(__unused struct power_module *module,
         power_hint_t hint, void *data)
 {
-    struct timeval cur_boost_timeval = {0, 0};
-    static unsigned long long previous_boost_time = 0;
-    unsigned long long cur_boost_time;
-    double elapsed_time;
+    static struct timespec s_previous_boost_timespec;
+    struct timespec cur_boost_timespec;
+    long long elapsed_time;
     int duration;
 
     int resources_launch_boost[] = {
@@ -317,9 +316,8 @@ int power_hint_override(__unused struct power_module *module,
     if (hint == POWER_HINT_INTERACTION) {
         duration = data ? *((int *)data) : 500;
 
-        gettimeofday(&cur_boost_timeval, NULL);
-        cur_boost_time = cur_boost_timeval.tv_sec * 1000000 + cur_boost_timeval.tv_usec;
-        elapsed_time = (double) (cur_boost_time - previous_boost_time);
+        clock_gettime(CLOCK_MONOTONIC, &cur_boost_timespec);
+        elapsed_time = calc_timespan_us(s_previous_boost_timespec, cur_boost_timespec);
         if (elapsed_time > 750000)
             elapsed_time = 750000;
         /**
@@ -330,7 +328,7 @@ int power_hint_override(__unused struct power_module *module,
         else if (elapsed_time < 250000 && duration <= 750)
             return HINT_HANDLED;
 
-        previous_boost_time = cur_boost_time;
+        s_previous_boost_timespec = cur_boost_timespec;
 
         if (duration >= 1500) {
             interaction(duration, ARRAY_SIZE(resources_interaction_fling_boost),
diff --git a/power/utils.c b/power/utils.c
index 202b718..ac73edd 100644
--- a/power/utils.c
+++ b/power/utils.c
@@ -33,6 +33,7 @@
 #include <errno.h>
 #include <string.h>
 #include <stdlib.h>
+#include <sys/stat.h>
 
 #include "utils.h"
 #include "list.h"
@@ -42,6 +43,9 @@
 #define LOG_TAG "QCOM PowerHAL"
 #include <utils/Log.h>
 
+#define USINSEC 1000000L
+#define NSINUS 1000L
+
 #define SOC_ID_0 "/sys/devices/soc0/soc_id"
 #define SOC_ID_1 "/sys/devices/system/soc/soc0/id"
 
@@ -391,6 +395,14 @@ void start_prefetch(int pid, const char* packageName) {
     }
 }
 
+long long calc_timespan_us(struct timespec start, struct timespec end)
+{
+    long long diff_in_us = 0;
+    diff_in_us += (end.tv_sec - start.tv_sec) * USINSEC;
+    diff_in_us += (end.tv_nsec - start.tv_nsec) / NSINUS;
+    return diff_in_us;
+}
+
 int get_soc_id(void)
 {
     int fd;
diff --git a/power/utils.h b/power/utils.h
index fb8d84c..3c4da92 100644
--- a/power/utils.h
+++ b/power/utils.h
@@ -44,4 +44,6 @@ void undo_hint_action(int hint_id);
 void undo_initial_hint_action();
 void set_profile(int profile);
 void start_prefetch(int pid, const char *packageName);
+
+long long calc_timespan_us(struct timespec start, struct timespec end);
 int get_soc_id(void);