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1 /* | |
2 * Copyright 2016 Google Inc. | |
3 * | |
4 * Use of this source code is governed by a BSD-style license that can be | |
5 * found in the LICENSE file. | |
6 */ | |
7 | |
8 #include "ThermalManager.h" | |
9 | |
10 #include "SkOSFile.h" | |
11 | |
12 #include <stdio.h> | |
13 | |
14 #ifdef THERMAL_MANAGER_SUPPORTED | |
15 | |
16 /* | |
17 * ThermalManager is completely dependent on sysfs to monitor thermal temperatur es. In sysfs | |
18 * thermal management is controlled by a number of thermal zones. They are laid out as follows: | |
19 * /sys/class/thermal/thermal_zoneN where N is the number of the thermal zone st arting at 0. | |
20 * | |
21 * Inside each thermal_zone folder is a file called 'temp,' which has the curren t temperature | |
22 * reading from the sensor in that zone, as well as 0 or more files called 'trip _point_N_temp.' | |
23 * | |
24 * When the reading in temp is greater than one of the numbers in the trip_point files, then the | |
25 * kernel will take some kind of action. This is all documented online. | |
26 * | |
27 * In any case, the goal of this class is to sleep right before a trip point is about to be | |
28 * triggered, thus naturally cooling the system and preventing thermal throttlin g. | |
29 */ | |
30 | |
31 ThermalManager::ThermalManager(int32_t threshold, uint32_t sleepIntervalMs, uint 32_t timeoutMs) | |
32 : fSleepIntervalMs(sleepIntervalMs) | |
33 , fTimeoutMs(timeoutMs) { | |
34 static const char* kThermalZonePath = "/sys/class/thermal/"; | |
35 SkOSFile::Iter it(kThermalZonePath); | |
36 SkString path; | |
37 while (it.next(&path, true)) { | |
38 if (!path.contains("thermal_zone")) { | |
39 continue; | |
40 } | |
41 | |
42 SkString fullPath(kThermalZonePath); | |
43 fullPath.append(path); | |
44 SkOSFile::Iter thermalZoneIt(fullPath.c_str()); | |
45 | |
46 SkString filename; | |
47 while (thermalZoneIt.next(&filename)) { | |
48 if (!(filename.contains("trip_point") && filename.contains("temp"))) { | |
49 continue; | |
50 } | |
51 | |
52 fTripPoints.push_back(TripPoint(fullPath, filename, threshold)); | |
53 } | |
54 } | |
55 } | |
56 | |
57 bool ThermalManager::coolOffIfNecessary() { | |
58 uint32_t i = 0, totalTimeSleptMs = 0; | |
59 while (i < (uint32_t)fTripPoints.count() && totalTimeSleptMs < fTimeoutMs) { | |
60 if (fTripPoints[i].willTrip()) { | |
61 sleep(fSleepIntervalMs); | |
scroggo
2016/02/10 17:01:11
This breaks the AOSP mips build. From [1]:
extern
| |
62 totalTimeSleptMs += fSleepIntervalMs; | |
63 } else { | |
64 i++; | |
65 } | |
66 } | |
67 | |
68 return totalTimeSleptMs < fTimeoutMs; | |
69 } | |
70 | |
71 int32_t ThermalManager::OpenFileAndReadInt32(const char* path) { | |
72 FILE* tempFile = fopen(path, "r"); | |
73 SkASSERT(tempFile); | |
74 int32_t value; | |
75 int ret = fscanf(tempFile, "%d", &value); | |
76 if (!ret) { | |
77 SkDebugf("Could not read temperature\n"); | |
78 SkASSERT(false); | |
79 } | |
80 | |
81 fclose(tempFile); | |
82 return value; | |
83 } | |
84 | |
85 ThermalManager::TripPoint::TripPoint(SkString thermalZoneRoot, SkString pointNam e, | |
86 int32_t threshold) | |
87 : fThermalZoneRoot(thermalZoneRoot) | |
88 , fPointName(pointName) { | |
89 SkString fullPath(thermalZoneRoot); | |
90 fullPath.appendf("/%s", pointName.c_str()); | |
91 fPoint = OpenFileAndReadInt32(fullPath.c_str()); | |
92 fBase = GetTemp(fThermalZoneRoot); | |
93 fDisabled = fBase >= fPoint + fThreshold; // We disable any trip point whic h start off | |
94 // triggered | |
95 fThreshold = threshold; | |
96 if (!fDisabled) { | |
97 SkDebugf("Trip point %s base - %d trip point-%d\n", fullPath.c_str(), | |
98 fBase, fPoint); | |
99 } | |
100 } | |
101 | |
102 bool ThermalManager::TripPoint::willTrip() { | |
103 int32_t currentTemp = GetTemp(fThermalZoneRoot); | |
104 bool wouldTrip = !fDisabled && currentTemp + fThreshold >= fPoint; | |
105 | |
106 if (wouldTrip) { | |
107 SkDebugf("%s/%s would trip {%d,%d,%d,%d}\n", fThermalZoneRoot.c_str(), | |
108 fPointName.c_str(), fBase, currentTemp, fPoint, fThreshold); | |
109 } | |
110 return wouldTrip; | |
111 } | |
112 | |
113 #endif | |
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