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      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 
     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("sdm.perf_hint_window", &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 
     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 
     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