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/* Copyright (c) 2015, The Linux Foundataion. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of The Linux Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <cutils/properties.h>
#include <dlfcn.h>
#include <utils/debug.h>
#include "cpuhint.h"
#include "hwc_debugger.h"
#define __CLASS__ "CPUHint"
namespace sdm {
DisplayError CPUHint::Init(HWCDebugHandler *debug_handler) {
char path[PROPERTY_VALUE_MAX];
if (debug_handler->GetProperty("ro.vendor.extension_library", path) != kErrorNone) {
DLOGI("Vendor Extension Library not enabled");
return kErrorNotSupported;
}
int pre_enable_window = -1;
debug_handler->GetProperty("sdm.perf_hint_window", &pre_enable_window);
if (pre_enable_window <= 0) {
DLOGI("Invalid CPU Hint Pre-enable Window %d", pre_enable_window);
return kErrorNotSupported;
}
DLOGI("CPU Hint Pre-enable Window %d", pre_enable_window);
pre_enable_window_ = pre_enable_window;
if (vendor_ext_lib_.Open(path)) {
if (!vendor_ext_lib_.Sym("perf_lock_acq", reinterpret_cast<void **>(&fn_lock_acquire_)) ||
!vendor_ext_lib_.Sym("perf_lock_rel", reinterpret_cast<void **>(&fn_lock_release_))) {
DLOGW("Failed to load symbols for Vendor Extension Library");
return kErrorNotSupported;
}
DLOGI("Successfully Loaded Vendor Extension Library symbols");
enabled_ = true;
} else {
DLOGW("Failed to open %s : %s", path, vendor_ext_lib_.Error());
}
return kErrorNone;
}
void CPUHint::Set() {
if (!enabled_) {
return;
}
if (lock_acquired_) {
return;
}
if (frame_countdown_) {
--frame_countdown_;
return;
}
int hint = HINT;
lock_handle_ = fn_lock_acquire_(0 /*handle*/, 0/*duration*/,
&hint, sizeof(hint) / sizeof(int));
if (lock_handle_ >= 0) {
lock_acquired_ = true;
}
}
void CPUHint::Reset() {
if (!enabled_) {
return;
}
frame_countdown_ = pre_enable_window_;
if (!lock_acquired_) {
return;
}
fn_lock_release_(lock_handle_);
lock_acquired_ = false;
}
} // namespace sdm
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