Moritz Pflanzer | beabe3b | 2017-08-31 14:56:32 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2016, 2017 ARM Limited. |
| 3 | * |
| 4 | * SPDX-License-Identifier: MIT |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to |
| 8 | * deal in the Software without restriction, including without limitation the |
| 9 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
| 10 | * sell copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in all |
| 14 | * copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 19 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 22 | * SOFTWARE. |
| 23 | */ |
| 24 | #include "arm_compute/runtime/IScheduler.h" |
| 25 | |
| 26 | #include <array> |
| 27 | #include <cstdlib> |
| 28 | #include <cstring> |
| 29 | #include <fcntl.h> |
| 30 | #include <sched.h> |
| 31 | #include <sys/stat.h> |
| 32 | #include <sys/types.h> |
| 33 | #include <unistd.h> |
| 34 | |
| 35 | namespace |
| 36 | { |
| 37 | unsigned int get_cpu_impl() |
| 38 | { |
| 39 | #ifndef BARE_METAL |
| 40 | int fd = open("/proc/cpuinfo", 0); // NOLINT |
| 41 | std::array<char, 1200> buff{ {} }; |
| 42 | char *pos = nullptr; |
| 43 | char *end = nullptr; |
| 44 | bool foundid = false; |
| 45 | |
| 46 | int cpu = sched_getcpu(); |
| 47 | |
| 48 | if(fd == -1) |
| 49 | { |
| 50 | return 0; |
| 51 | } |
| 52 | |
| 53 | int charsread = read(fd, buff.data(), 1200); |
| 54 | pos = buff.data(); |
| 55 | end = buff.data() + charsread; |
| 56 | |
| 57 | close(fd); |
| 58 | |
| 59 | /* So, to date I've encountered two formats for /proc/cpuinfo. |
| 60 | * |
| 61 | * One of them just lists processor : n for each processor (with no |
| 62 | * other info), then at the end lists part information for the current |
| 63 | * CPU. |
| 64 | * |
| 65 | * The other has an entire clause (including part number info) for each |
| 66 | * CPU in the system, with "processor : n" headers. |
| 67 | * |
| 68 | * We can cope with either of these formats by waiting to see |
| 69 | * "processor: n" (where n = our CPU ID), and then looking for the next |
| 70 | * "CPU part" field. |
| 71 | */ |
| 72 | while(pos < end) |
| 73 | { |
| 74 | if(foundid && strncmp(pos, "CPU part", 8) == 0) |
| 75 | { |
| 76 | /* Found part number */ |
| 77 | pos += 11; |
| 78 | |
| 79 | for(char *ch = pos; ch < end; ch++) |
| 80 | { |
| 81 | if(*ch == '\n') |
| 82 | { |
| 83 | *ch = '\0'; |
| 84 | break; |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | return strtoul(pos, nullptr, 0); |
| 89 | } |
| 90 | |
| 91 | if(strncmp(pos, "processor", 9) == 0) |
| 92 | { |
| 93 | /* Found processor ID, see if it's ours. */ |
| 94 | pos += 11; |
| 95 | |
| 96 | for(char *ch = pos; ch < end; ch++) |
| 97 | { |
| 98 | if(*ch == '\n') |
| 99 | { |
| 100 | *ch = '\0'; |
| 101 | break; |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | int num = strtol(pos, nullptr, 0); |
| 106 | |
| 107 | if(num == cpu) |
| 108 | { |
| 109 | foundid = true; |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | while(pos < end) |
| 114 | { |
| 115 | char ch = *pos++; |
| 116 | if(ch == '\n' || ch == '\0') |
| 117 | { |
| 118 | break; |
| 119 | } |
| 120 | } |
| 121 | } |
| 122 | #endif /* BARE_METAL */ |
| 123 | |
| 124 | return 0; |
| 125 | } |
| 126 | } // namespace |
| 127 | |
| 128 | namespace arm_compute |
| 129 | { |
| 130 | IScheduler::IScheduler() |
| 131 | { |
| 132 | switch(get_cpu_impl()) |
| 133 | { |
Pablo Tello | 6f6639d | 2017-12-04 17:30:07 +0000 | [diff] [blame] | 134 | case 0xd0f: |
| 135 | _info.CPU = CPUTarget::A55_DOT; |
| 136 | break; |
Moritz Pflanzer | beabe3b | 2017-08-31 14:56:32 +0100 | [diff] [blame] | 137 | case 0xd03: |
| 138 | _info.CPU = CPUTarget::A53; |
| 139 | break; |
| 140 | default: |
Moritz Pflanzer | 80373f6 | 2017-09-15 10:42:58 +0100 | [diff] [blame] | 141 | #ifdef __arm__ |
| 142 | _info.CPU = CPUTarget::ARMV7; |
| 143 | #elif __aarch64__ |
Moritz Pflanzer | beabe3b | 2017-08-31 14:56:32 +0100 | [diff] [blame] | 144 | _info.CPU = CPUTarget::ARMV8; |
Moritz Pflanzer | 80373f6 | 2017-09-15 10:42:58 +0100 | [diff] [blame] | 145 | #else /* __arm__ || __aarch64__ */ |
Moritz Pflanzer | beabe3b | 2017-08-31 14:56:32 +0100 | [diff] [blame] | 146 | _info.CPU = CPUTarget::INTRINSICS; |
Moritz Pflanzer | 80373f6 | 2017-09-15 10:42:58 +0100 | [diff] [blame] | 147 | #endif /* __arm__ || __aarch64__ */ |
Moritz Pflanzer | beabe3b | 2017-08-31 14:56:32 +0100 | [diff] [blame] | 148 | break; |
| 149 | } |
| 150 | |
| 151 | _info.L1_size = 31000; |
| 152 | _info.L2_size = 500000; |
| 153 | } |
| 154 | |
| 155 | void IScheduler::set_target(CPUTarget target) |
| 156 | { |
| 157 | _info.CPU = target; |
| 158 | } |
| 159 | |
| 160 | CPUInfo IScheduler::cpu_info() const |
| 161 | { |
| 162 | return _info; |
| 163 | } |
| 164 | } // namespace arm_compute |