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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 COUNTERS_COUNT 10
71 #define CONFIG_COUNT 8
72 #define KPC_MASK (KPC_CLASS_CONFIGURABLE_MASK | KPC_CLASS_FIXED_MASK)
73 
kperf_init(void)74 static void kperf_init(void)
75 {
76     uint64_t config[COUNTERS_COUNT] = {0};
77     void *kperf = NULL;
78 
79     av_assert0(kperf = dlopen("/System/Library/PrivateFrameworks/kperf.framework/Versions/A/kperf", RTLD_LAZY));
80 
81 #define F(ret, name, ...) av_assert0(name = (name##proc *)(dlsym(kperf, #name)));
82     KPERF_LIST
83 #undef F
84 
85     av_assert0(kpc_get_counter_count(KPC_MASK) == COUNTERS_COUNT);
86     av_assert0(kpc_get_config_count(KPC_MASK) == CONFIG_COUNT);
87 
88     config[0] = CPMU_CORE_CYCLE | CFGWORD_EL0A64EN_MASK;
89     // config[3] = CPMU_INST_BRANCH | CFGWORD_EL0A64EN_MASK;
90     // config[4] = CPMU_SYNC_BR_ANY_MISP | CFGWORD_EL0A64EN_MASK;
91     // config[5] = CPMU_INST_A64 | CFGWORD_EL0A64EN_MASK;
92 
93     av_assert0(kpc_set_config(KPC_MASK, config) == 0 || !"the kperf API needs to be run as root");
94     av_assert0(kpc_force_all_ctrs_set(1) == 0);
95     av_assert0(kpc_set_counting(KPC_MASK) == 0);
96     av_assert0(kpc_set_thread_counting(KPC_MASK) == 0);
97 }
98 
ff_kperf_init(void)99 void ff_kperf_init(void)
100 {
101     static AVOnce init_static_once = AV_ONCE_INIT;
102     ff_thread_once(&init_static_once, kperf_init);
103 }
104 
ff_kperf_cycles()105 uint64_t ff_kperf_cycles()
106 {
107     uint64_t counters[COUNTERS_COUNT];
108     if (kpc_get_thread_counters(0, COUNTERS_COUNT, counters)) {
109         return -1;
110     }
111 
112     return counters[0];
113 }
114