libavutil/macos_kperf.c

   1 /*
   2  * This file is part of FFmpeg.
   3  *
   4  * FFmpeg is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * FFmpeg is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include "avassert.h"
  20 #include "macos_kperf.h"
  21 #include "thread.h"
  22
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <dlfcn.h>
  26
  27 #define KPERF_LIST                                             \
  28     F(int, kpc_get_counting, void)                             \
  29     F(int, kpc_force_all_ctrs_set, int)                        \
  30     F(int, kpc_set_counting, uint32_t)                         \
  31     F(int, kpc_set_thread_counting, uint32_t)                  \
  32     F(int, kpc_set_config, uint32_t, void *)                   \
  33     F(int, kpc_get_config, uint32_t, void *)                   \
  34     F(int, kpc_set_period, uint32_t, void *)                   \
  35     F(int, kpc_get_period, uint32_t, void *)                   \
  36     F(uint32_t, kpc_get_counter_count, uint32_t)               \
  37     F(uint32_t, kpc_get_config_count, uint32_t)                \
  38     F(int, kperf_sample_get, int *)                            \
  39     F(int, kpc_get_thread_counters, int, unsigned int, void *)
  40
  41 #define F(ret, name, ...)                                      \
  42     typedef ret name##proc(__VA_ARGS__);                       \
  43     static name##proc *name = NULL;
  44 KPERF_LIST
  45 #undef F
  46
  47 #define CFGWORD_EL0A32EN_MASK (0x10000)
  48 #define CFGWORD_EL0A64EN_MASK (0x20000)
  49 #define CFGWORD_EL1EN_MASK    (0x40000)
  50 #define CFGWORD_EL3EN_MASK    (0x80000)
  51 #define CFGWORD_ALLMODES_MASK (0xf0000)
  52
  53 #define CPMU_NONE 0
  54 #define CPMU_CORE_CYCLE 0x02
  55 #define CPMU_INST_A64 0x8c
  56 #define CPMU_INST_BRANCH 0x8d
  57 #define CPMU_SYNC_DC_LOAD_MISS 0xbf
  58 #define CPMU_SYNC_DC_STORE_MISS 0xc0
  59 #define CPMU_SYNC_DTLB_MISS 0xc1
  60 #define CPMU_SYNC_ST_HIT_YNGR_LD 0xc4
  61 #define CPMU_SYNC_BR_ANY_MISP 0xcb
  62 #define CPMU_FED_IC_MISS_DEM 0xd3
  63 #define CPMU_FED_ITLB_MISS 0xd4
  64
  65 #define KPC_CLASS_FIXED_MASK        (1 << 0)
  66 #define KPC_CLASS_CONFIGURABLE_MASK (1 << 1)
  67 #define KPC_CLASS_POWER_MASK        (1 << 2)
  68 #define KPC_CLASS_RAWPMU_MASK       (1 << 3)
  69
  70 #define KPC_MAX_COUNTERS 32
  71 #define CONFIG_COUNT 8
  72 #define KPC_MASK (KPC_CLASS_CONFIGURABLE_MASK | KPC_CLASS_FIXED_MASK)
  73
  74 static void kperf_init(void)
  75 {
  76     uint64_t config[CONFIG_COUNT] = {0};
  77     void *kperf = NULL;
  78     uint32_t n;
  79
  80     av_assert0(kperf = dlopen("/System/Library/PrivateFrameworks/kperf.framework/Versions/A/kperf", RTLD_LAZY));
  81
  82 #define F(ret, name, ...) av_assert0(name = (name##proc *)(dlsym(kperf, #name)));
  83     KPERF_LIST
  84 #undef F
  85
  86     n = kpc_get_counter_count(KPC_MASK);
  87     av_assert0(n <= KPC_MAX_COUNTERS);
  88     n = kpc_get_config_count(KPC_MASK);
  89     av_assert0(n <= CONFIG_COUNT);
  90
  91     config[0] = CPMU_CORE_CYCLE | CFGWORD_EL0A64EN_MASK;
  92     // config[3] = CPMU_INST_BRANCH | CFGWORD_EL0A64EN_MASK;
  93     // config[4] = CPMU_SYNC_BR_ANY_MISP | CFGWORD_EL0A64EN_MASK;
  94     // config[5] = CPMU_INST_A64 | CFGWORD_EL0A64EN_MASK;
  95
  96     av_assert0(kpc_set_config(KPC_MASK, config) == 0 || !"the kperf API needs to be run as root");
  97     av_assert0(kpc_force_all_ctrs_set(1) == 0);
  98     av_assert0(kpc_set_counting(KPC_MASK) == 0);
  99     av_assert0(kpc_set_thread_counting(KPC_MASK) == 0);
 100 }
 101
 102 void ff_kperf_init(void)
 103 {
 104     static AVOnce init_static_once = AV_ONCE_INIT;
 105     ff_thread_once(&init_static_once, kperf_init);
 106 }
 107
 108 uint64_t ff_kperf_cycles(void)
 109 {
 110     uint64_t counters[KPC_MAX_COUNTERS];
 111
 112     if (kpc_get_thread_counters(0, KPC_MAX_COUNTERS, counters)) {
 113         return -1;
 114     }
 115
 116     return counters[0];
 117 }