1 /* Copyright (c) 2015,2018 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
Init(HWCDebugHandler * debug_handler)41 DisplayError CPUHint::Init(HWCDebugHandler *debug_handler) {
42 char path[PROPERTY_VALUE_MAX];
43 if (debug_handler->GetProperty("ro.vendor.extension_library", path) != kErrorNone) {
44 DLOGI("Vendor Extension Library not enabled");
45 return kErrorNotSupported;
46 }
47
48 int pre_enable_window = -1;
49 debug_handler->GetProperty(PERF_HINT_WINDOW_PROP, &pre_enable_window);
50 if (pre_enable_window <= 0) {
51 DLOGI("Invalid CPU Hint Pre-enable Window %d", pre_enable_window);
52 return kErrorNotSupported;
53 }
54
55 DLOGI("CPU Hint Pre-enable Window %d", pre_enable_window);
56 pre_enable_window_ = pre_enable_window;
57
58 if (vendor_ext_lib_.Open(path)) {
59 if (!vendor_ext_lib_.Sym("perf_lock_acq", reinterpret_cast<void **>(&fn_lock_acquire_)) ||
60 !vendor_ext_lib_.Sym("perf_lock_rel", reinterpret_cast<void **>(&fn_lock_release_))) {
61 DLOGW("Failed to load symbols for Vendor Extension Library");
62 return kErrorNotSupported;
63 }
64 DLOGI("Successfully Loaded Vendor Extension Library symbols");
65 enabled_ = true;
66 } else {
67 DLOGW("Failed to open %s : %s", path, vendor_ext_lib_.Error());
68 }
69
70 return kErrorNone;
71 }
72
Set()73 void CPUHint::Set() {
74 if (!enabled_) {
75 return;
76 }
77 if (lock_acquired_) {
78 return;
79 }
80 if (frame_countdown_) {
81 --frame_countdown_;
82 return;
83 }
84
85 int hint = HINT;
86 lock_handle_ = fn_lock_acquire_(0 /*handle*/, 0/*duration*/,
87 &hint, sizeof(hint) / sizeof(int));
88 if (lock_handle_ >= 0) {
89 lock_acquired_ = true;
90 }
91 }
92
Reset()93 void CPUHint::Reset() {
94 if (!enabled_) {
95 return;
96 }
97
98 frame_countdown_ = pre_enable_window_;
99
100 if (!lock_acquired_) {
101 return;
102 }
103
104 fn_lock_release_(lock_handle_);
105 lock_acquired_ = false;
106 }
107
108 } // namespace sdm
109