| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /*********************************************************************************/ | ||
| 2 | /* Copyright 2009-2026 Barcelona Supercomputing Center */ | ||
| 3 | /* */ | ||
| 4 | /* This file is part of the DLB library. */ | ||
| 5 | /* */ | ||
| 6 | /* DLB is free software: you can redistribute it and/or modify */ | ||
| 7 | /* it under the terms of the GNU Lesser General Public License as published by */ | ||
| 8 | /* the Free Software Foundation, either version 3 of the License, or */ | ||
| 9 | /* (at your option) any later version. */ | ||
| 10 | /* */ | ||
| 11 | /* DLB is distributed in the hope that it will be useful, */ | ||
| 12 | /* but WITHOUT ANY WARRANTY; without even the implied warranty of */ | ||
| 13 | /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ | ||
| 14 | /* GNU Lesser General Public License for more details. */ | ||
| 15 | /* */ | ||
| 16 | /* You should have received a copy of the GNU Lesser General Public License */ | ||
| 17 | /* along with DLB. If not, see <https://www.gnu.org/licenses/>. */ | ||
| 18 | /*********************************************************************************/ | ||
| 19 | |||
| 20 | #include "talp/talp_hwc.h" | ||
| 21 | |||
| 22 | #include "apis/dlb_errors.h" | ||
| 23 | #include "LB_core/spd.h" | ||
| 24 | #include "support/atomic.h" | ||
| 25 | #include "support/debug.h" | ||
| 26 | #include "support/dlb_common.h" | ||
| 27 | #include "talp/backend.h" | ||
| 28 | #include "talp/backend_manager.h" | ||
| 29 | #include "talp/regions.h" | ||
| 30 | #include "talp/talp.h" | ||
| 31 | #include "talp/talp_output.h" | ||
| 32 | #include "talp/talp_types.h" | ||
| 33 | |||
| 34 | |||
| 35 | typedef struct { | ||
| 36 | bool active; | ||
| 37 | bool have_last; | ||
| 38 | hw_counters_t last_raw; // last raw value from backend | ||
| 39 | } hwc_ctx_t; | ||
| 40 | |||
| 41 | static __thread hwc_ctx_t ctx = {0}; | ||
| 42 | |||
| 43 | static const backend_api_t *hwc_backend_api = NULL; | ||
| 44 | |||
| 45 | |||
| 46 | 28 | int talp_hwc_init(const subprocess_descriptor_t *spd) { | |
| 47 | |||
| 48 | 28 | hwc_backend_api = talp_backend_manager_load_hwc_backend(spd->options.talp_hwc_backend); | |
| 49 |
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28 | if (hwc_backend_api == NULL) { |
| 50 | 28 | debug_warning("HWC backend could not be loaded"); | |
| 51 | 28 | return DLB_ERR_UNKNOWN; | |
| 52 | } | ||
| 53 | |||
| 54 | int error; | ||
| 55 | |||
| 56 | /* If HWC component is not explicitly set, probe plugin first */ | ||
| 57 | ✗ | if (!(spd->options.talp & TALP_COMPONENT_HWC)) { | |
| 58 | ✗ | error = hwc_backend_api->probe(); | |
| 59 | ✗ | if (error == DLB_BACKEND_ERROR) { | |
| 60 | ✗ | debug_warning("HWC backend probe failed"); | |
| 61 | ✗ | return DLB_ERR_UNKNOWN; | |
| 62 | } | ||
| 63 | } | ||
| 64 | |||
| 65 | ✗ | error = hwc_backend_api->init(&core_api); | |
| 66 | ✗ | if (error == DLB_BACKEND_ERROR) { | |
| 67 | ✗ | debug_warning("HWC backend could not be initialized"); | |
| 68 | ✗ | return DLB_ERR_UNKNOWN; | |
| 69 | } | ||
| 70 | |||
| 71 | ✗ | error = hwc_backend_api->start(); | |
| 72 | ✗ | if (error == DLB_BACKEND_ERROR) { | |
| 73 | ✗ | debug_warning("HWC backend could not be started"); | |
| 74 | ✗ | hwc_backend_api->finalize(); | |
| 75 | ✗ | return DLB_ERR_UNKNOWN; | |
| 76 | } | ||
| 77 | |||
| 78 | ✗ | return DLB_SUCCESS; | |
| 79 | } | ||
| 80 | |||
| 81 | |||
| 82 | ✗ | int talp_hwc_thread_init(void) { | |
| 83 | |||
| 84 | ✗ | if (hwc_backend_api == NULL) return DLB_ERR_UNKNOWN; | |
| 85 | |||
| 86 | ✗ | int error = hwc_backend_api->start(); | |
| 87 | ✗ | if (error == DLB_BACKEND_ERROR) return DLB_ERR_UNKNOWN; | |
| 88 | |||
| 89 | ✗ | return DLB_SUCCESS; | |
| 90 | } | ||
| 91 | |||
| 92 | |||
| 93 | ✗ | void talp_hwc_finalize(void) { | |
| 94 | |||
| 95 | ✗ | if (hwc_backend_api != NULL) { | |
| 96 | |||
| 97 | ✗ | hwc_backend_api->stop(); | |
| 98 | ✗ | hwc_backend_api->finalize(); | |
| 99 | |||
| 100 | ✗ | talp_backend_manager_unload_hwc_backend(); | |
| 101 | ✗ | hwc_backend_api = NULL; | |
| 102 | } | ||
| 103 | } | ||
| 104 | |||
| 105 | ✗ | void talp_hwc_thread_finalize(void) { | |
| 106 | |||
| 107 | ✗ | if (hwc_backend_api != NULL) { | |
| 108 | ✗ | hwc_backend_api->stop(); | |
| 109 | } | ||
| 110 | } | ||
| 111 | |||
| 112 | ✗ | void talp_hwc_on_state_change(talp_sample_state_t old_state, talp_sample_state_t new_state) { | |
| 113 | |||
| 114 | ✗ | if (old_state != TALP_STATE_USEFUL | |
| 115 | ✗ | && new_state == TALP_STATE_USEFUL) { | |
| 116 | |||
| 117 | ✗ | ctx.active = true; | |
| 118 | ✗ | if (hwc_backend_api->hwc.collect(&ctx.last_raw) == DLB_BACKEND_SUCCESS) { | |
| 119 | ✗ | ctx.have_last = true; | |
| 120 | } | ||
| 121 | } | ||
| 122 | |||
| 123 | ✗ | else if (old_state == TALP_STATE_USEFUL | |
| 124 | ✗ | && new_state != TALP_STATE_USEFUL) { | |
| 125 | ✗ | ctx.active = false; | |
| 126 | } | ||
| 127 | } | ||
| 128 | |||
| 129 | ✗ | bool talp_hwc_collect(hw_counters_t *out) { | |
| 130 | |||
| 131 | ✗ | if (!ctx.active) { | |
| 132 | ✗ | return false; | |
| 133 | } | ||
| 134 | |||
| 135 | hw_counters_t raw; | ||
| 136 | ✗ | if (hwc_backend_api->hwc.collect(&raw) != DLB_BACKEND_SUCCESS) { | |
| 137 | ✗ | return false; | |
| 138 | } | ||
| 139 | |||
| 140 | /* Only if we try to collect before changing to 'useful' for the first time, | ||
| 141 | * discard this reading and use it as baseline for the next. */ | ||
| 142 | ✗ | if (unlikely(!ctx.have_last)) { | |
| 143 | ✗ | ctx.have_last = true; | |
| 144 | ✗ | ctx.last_raw = raw; | |
| 145 | ✗ | return false; | |
| 146 | } | ||
| 147 | |||
| 148 | ✗ | *out = (hw_counters_t) { | |
| 149 | ✗ | .cycles = raw.cycles - ctx.last_raw.cycles, | |
| 150 | ✗ | .instructions = raw.instructions - ctx.last_raw.instructions, | |
| 151 | }; | ||
| 152 | |||
| 153 | ✗ | ctx.last_raw = raw; | |
| 154 | |||
| 155 | ✗ | return true; | |
| 156 | } | ||
| 157 |