1 /* Copyright (c) 2015, The Linux Foundataion. All rights reserved.
2 *
3 * Redistribution and use in source and binary forms, with or without
4 * modification, are permitted provided that the following conditions are
5 * met:
6 * * Redistributions of source code must retain the above copyright
7 * notice, this list of conditions and the following disclaimer.
8 * * Redistributions in binary form must reproduce the above
9 * copyright notice, this list of conditions and the following
10 * disclaimer in the documentation and/or other materials provided
11 * with the distribution.
12 * * Neither the name of The Linux Foundation nor the names of its
13 * contributors may be used to endorse or promote products derived
14 * from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
23 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
25 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
26 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 */
29
30 #include <cutils/properties.h>
31 #include <dlfcn.h>
32 #include <utils/debug.h>
33
34 #include "cpuhint.h"
35 #include "hwc_debugger.h"
36
37 #define __CLASS__ "CPUHint"
38
39 namespace sdm {
40
~CPUHint()41 CPUHint::~CPUHint() {
42 if (lib_handle_) {
43 dlclose(lib_handle_);
44 lib_handle_ = NULL;
45 }
46 }
47
Init(HWCDebugHandler * debug_handler)48 DisplayError CPUHint::Init(HWCDebugHandler *debug_handler) {
49 char path[PROPERTY_VALUE_MAX];
50 if (debug_handler->GetProperty("ro.vendor.extension_library", path) != kErrorNone) {
51 DLOGI("Vendor Extension Library not enabled");
52 return kErrorNotSupported;
53 }
54
55 int pre_enable_window = -1;
56 debug_handler->GetProperty("sdm.perf_hint_window", &pre_enable_window);
57 if (pre_enable_window <= 0) {
58 DLOGI("Invalid CPU Hint Pre-enable Window %d", pre_enable_window);
59 return kErrorNotSupported;
60 }
61
62 DLOGI("CPU Hint Pre-enable Window %d", pre_enable_window);
63 pre_enable_window_ = pre_enable_window;
64 lib_handle_ = dlopen(path, RTLD_NOW);
65
66 if (lib_handle_) {
67 *(reinterpret_cast<void **>(&fn_lock_acquire_)) = dlsym(lib_handle_, "perf_lock_acq");
68 *(reinterpret_cast<void **>(&fn_lock_release_)) = dlsym(lib_handle_, "perf_lock_rel");
69 if (!fn_lock_acquire_ || !fn_lock_release_) {
70 DLOGW("Failed to load symbols for Vendor Extension Library");
71 return kErrorNotSupported;
72 }
73 DLOGI("Successfully Loaded Vendor Extension Library symbols");
74 enabled_ = true;
75 } else {
76 DLOGW("Failed to open %s : %s", path, dlerror());
77 }
78
79 return kErrorNone;
80 }
81
Set()82 void CPUHint::Set() {
83 if (!enabled_) {
84 return;
85 }
86 if (lock_acquired_) {
87 return;
88 }
89 if (frame_countdown_) {
90 --frame_countdown_;
91 return;
92 }
93
94 int hint = HINT;
95 lock_handle_ = fn_lock_acquire_(0 /*handle*/, 0/*duration*/,
96 &hint, sizeof(hint) / sizeof(int));
97 if (lock_handle_ >= 0) {
98 lock_acquired_ = true;
99 }
100 }
101
Reset()102 void CPUHint::Reset() {
103 if (!enabled_) {
104 return;
105 }
106
107 frame_countdown_ = pre_enable_window_;
108
109 if (!lock_acquired_) {
110 return;
111 }
112
113 fn_lock_release_(lock_handle_);
114 lock_acquired_ = false;
115 }
116
117 } // namespace sdm
118