power-8996.c

/*
 * Copyright (c) 2015-2016, The Linux Foundation. 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.
 */
#define LOG_NIDEBUG 0

#include <dlfcn.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>

#define LOG_TAG "QTI PowerHAL"
#include <hardware/hardware.h>
#include <hardware/power.h>
#include <log/log.h>

#include "hint-data.h"
#include "metadata-defs.h"
#include "performance.h"
#include "power-common.h"
#include "utils.h"

#define NUM_PERF_MODES 3

static int video_encode_hint_sent;

const int kMinInteractiveDuration = 500;  /* ms */
const int kMaxInteractiveDuration = 5000; /* ms */
const int kMaxLaunchDuration = 5000;      /* ms */

typedef enum {
    NORMAL_MODE = 0,
    SUSTAINED_MODE = 1,
    VR_MODE = 2,
    VR_SUSTAINED_MODE = (SUSTAINED_MODE | VR_MODE),
    INVALID_MODE = 0xFF
} perf_mode_type_t;

typedef struct perf_mode {
    perf_mode_type_t type;
    int perf_hint_id;
} perf_mode_t;

perf_mode_t perf_modes[NUM_PERF_MODES] = {{SUSTAINED_MODE, SUSTAINED_PERF_HINT},
                                          {VR_MODE, VR_MODE_HINT},
                                          {VR_SUSTAINED_MODE, VR_MODE_SUSTAINED_PERF_HINT}};

static int current_mode = NORMAL_MODE;

static inline int get_perfd_hint_id(perf_mode_type_t type) {
    int i;
    for (i = 0; i < NUM_PERF_MODES; i++) {
        if (perf_modes[i].type == type) {
            ALOGD("Hint id is 0x%x for mode 0x%x", perf_modes[i].perf_hint_id, type);
            return perf_modes[i].perf_hint_id;
        }
    }
    ALOGD("Couldn't find the hint for mode 0x%x", type);
    return 0;
}

static int switch_mode(perf_mode_type_t mode) {
    int hint_id = 0;
    static int perfd_mode_handle = -1;

    // release existing mode if any
    if (CHECK_HANDLE(perfd_mode_handle)) {
        ALOGD("Releasing handle 0x%x", perfd_mode_handle);
        release_request(perfd_mode_handle);
        perfd_mode_handle = -1;
    }
    // switch to a perf mode
    hint_id = get_perfd_hint_id(mode);
    if (hint_id != 0) {
        perfd_mode_handle = perf_hint_enable(hint_id, 0);
        if (!CHECK_HANDLE(perfd_mode_handle)) {
            ALOGE("Failed perf_hint_interaction for mode: 0x%x", mode);
            return -1;
        }
        ALOGD("Acquired handle 0x%x", perfd_mode_handle);
    }
    return 0;
}

static int process_perf_hint(void* data, perf_mode_type_t mode) {
    // enable
    if (data) {
        ALOGI("Enable request for mode: 0x%x", mode);
        // check if mode is current mode
        if (current_mode & mode) {
            ALOGD("Mode 0x%x already enabled", mode);
            return HINT_HANDLED;
        }
        // enable requested mode
        if (0 != switch_mode(current_mode | mode)) {
            ALOGE("Couldn't enable mode 0x%x", mode);
            return HINT_NONE;
        }
        current_mode |= mode;
        ALOGI("Current mode is 0x%x", current_mode);
        // disable
    } else {
        ALOGI("Disable request for mode: 0x%x", mode);
        // check if mode is enabled
        if (!(current_mode & mode)) {
            ALOGD("Mode 0x%x already disabled", mode);
            return HINT_HANDLED;
        }
        // disable requested mode
        if (0 != switch_mode(current_mode & ~mode)) {
            ALOGE("Couldn't disable mode 0x%x", mode);
            return HINT_NONE;
        }
        current_mode &= ~mode;
        ALOGI("Current mode is 0x%x", current_mode);
    }

    return HINT_HANDLED;
}

static int process_video_encode_hint(void* metadata) {
    char governor[80];
    struct video_encode_metadata_t video_encode_metadata;

    if (!metadata) return HINT_NONE;

    if (get_scaling_governor(governor, sizeof(governor)) == -1) {
        ALOGE("Can't obtain scaling governor.");
        return HINT_NONE;
    }

    /* Initialize encode metadata struct fields */
    memset(&video_encode_metadata, 0, sizeof(struct video_encode_metadata_t));
    video_encode_metadata.state = -1;
    video_encode_metadata.hint_id = DEFAULT_VIDEO_ENCODE_HINT_ID;

    if (parse_video_encode_metadata((char*)metadata, &video_encode_metadata) == -1) {
        ALOGE("Error occurred while parsing metadata.");
        return HINT_NONE;
    }

    if (video_encode_metadata.state == 1) {
        if (is_interactive_governor(governor)) {
            /* 1. cpufreq params
             *    -above_hispeed_delay for LVT - 40ms
             *    -go hispeed load for LVT - 95
             *    -hispeed freq for LVT - 556 MHz
             *    -target load for LVT - 90
             *    -above hispeed delay for sLVT - 40ms
             *    -go hispeed load for sLVT - 95
             *    -hispeed freq for sLVT - 806 MHz
             *    -target load for sLVT - 90
             * 2. bus DCVS set to V2 config:
             *    -low power ceil mpbs - 2500
             *    -low power io percent - 50
             * 3. hysteresis optimization
             *    -bus dcvs hysteresis tuning
             *    -sample_ms of 10 ms
             */
            int resource_values[] = {
                    ABOVE_HISPEED_DELAY_BIG,    0x4,   GO_HISPEED_LOAD_BIG,    0x5F,
                    HISPEED_FREQ_BIG,           0x326, TARGET_LOADS_BIG,       0x5A,
                    ABOVE_HISPEED_DELAY_LITTLE, 0x4,   GO_HISPEED_LOAD_LITTLE, 0x5F,
                    HISPEED_FREQ_LITTLE,        0x22C, TARGET_LOADS_LITTLE,    0x5A,
                    LOW_POWER_CEIL_MBPS,        0x9C4, LOW_POWER_IO_PERCENT,   0x32,
                    CPUBW_HWMON_HYST_OPT,       0x0,   CPUBW_HWMON_SAMPLE_MS,  0xA};
            if (!video_encode_hint_sent) {
                perform_hint_action(video_encode_metadata.hint_id, resource_values,
                                    ARRAY_SIZE(resource_values));
                video_encode_hint_sent = 1;
                return HINT_HANDLED;
            }
        }
    } else if (video_encode_metadata.state == 0) {
        if (is_interactive_governor(governor)) {
            undo_hint_action(video_encode_metadata.hint_id);
            video_encode_hint_sent = 0;
            return HINT_HANDLED;
        }
    }
    return HINT_NONE;
}

static void process_interaction_hint(void* data) {
    static struct timespec s_previous_boost_timespec;
    static int s_previous_duration = 0;

    struct timespec cur_boost_timespec;
    long long elapsed_time;
    int duration = kMinInteractiveDuration;

    if (current_mode != NORMAL_MODE) {
        ALOGV("%s: ignoring due to other active perf hints", __func__);
        return;
    }

    if (data) {
        int input_duration = *((int*)data);
        if (input_duration > duration) {
            duration = (input_duration > kMaxInteractiveDuration) ? kMaxInteractiveDuration
                                                                  : input_duration;
        }
    }

    clock_gettime(CLOCK_MONOTONIC, &cur_boost_timespec);

    elapsed_time = calc_timespan_us(s_previous_boost_timespec, cur_boost_timespec);
    // don't hint if it's been less than 250ms since last boost
    // also detect if we're doing anything resembling a fling
    // support additional boosting in case of flings
    if (elapsed_time < 250000 && duration <= 750) {
        return;
    }
    s_previous_boost_timespec = cur_boost_timespec;
    s_previous_duration = duration;

    perf_hint_enable_with_type(VENDOR_HINT_SCROLL_BOOST, duration, SCROLL_VERTICAL);
}

static int process_activity_launch_hint(void* data) {
    static int launch_handle = -1;
    static int launch_mode = 0;

    // release lock early if launch has finished
    if (!data) {
        if (CHECK_HANDLE(launch_handle)) {
            release_request(launch_handle);
            launch_handle = -1;
        }
        launch_mode = 0;
        return HINT_HANDLED;
    }

    if (current_mode != NORMAL_MODE) {
        ALOGV("%s: ignoring due to other active perf hints", __func__);
    } else if (!launch_mode) {
        launch_handle = perf_hint_enable_with_type(VENDOR_HINT_FIRST_LAUNCH_BOOST,
                                                   kMaxLaunchDuration, LAUNCH_BOOST_V1);
        if (!CHECK_HANDLE(launch_handle)) {
            ALOGE("Failed to perform launch boost");
            return HINT_NONE;
        }
        launch_mode = 1;
    }
    return HINT_HANDLED;
}

int power_hint_override(power_hint_t hint, void* data) {
    int ret_val = HINT_NONE;
    switch (hint) {
        case POWER_HINT_VIDEO_ENCODE:
            ret_val = process_video_encode_hint(data);
            break;
        case POWER_HINT_SUSTAINED_PERFORMANCE:
            ret_val = process_perf_hint(data, SUSTAINED_MODE);
            break;
        case POWER_HINT_VR_MODE:
            ret_val = process_perf_hint(data, VR_MODE);
            break;
        case POWER_HINT_INTERACTION:
            process_interaction_hint(data);
            ret_val = HINT_HANDLED;
            break;
        case POWER_HINT_LAUNCH:
            ret_val = process_activity_launch_hint(data);
            break;
        default:
            break;
    }
    return ret_val;
}

int set_interactive_override(int on) {
    return HINT_HANDLED; /* Don't excecute this code path, not in use */
}