1 /* 2 * SPDX-License-Identifier: GPL-2.0-or-later 3 * Copyright (C) 2025, Julian Ganz <neither@nut.email> 4 * 5 * Traps - count traps 6 * 7 * Count the number of interrupts (asyncronous events), exceptions (synchronous 8 * events) and host calls (e.g. semihosting) per cpu and report those counts on 9 * exit. 10 */ 11 12 #include <stdio.h> 13 14 #include <qemu-plugin.h> 15 16 QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION; 17 18 typedef struct { 19 uint64_t interrupts; 20 uint64_t exceptions; 21 uint64_t hostcalls; 22 } TrapCounters; 23 24 static struct qemu_plugin_scoreboard *traps; 25 26 static void vcpu_discon(qemu_plugin_id_t id, unsigned int vcpu_index, 27 enum qemu_plugin_discon_type type, uint64_t from_pc, 28 uint64_t to_pc) 29 { 30 TrapCounters *rec = qemu_plugin_scoreboard_find(traps, vcpu_index); 31 switch (type) { 32 case QEMU_PLUGIN_DISCON_INTERRUPT: 33 rec->interrupts++; 34 break; 35 case QEMU_PLUGIN_DISCON_EXCEPTION: 36 rec->exceptions++; 37 break; 38 case QEMU_PLUGIN_DISCON_HOSTCALL: 39 rec->hostcalls++; 40 break; 41 default: 42 g_assert_not_reached(); 43 break; 44 } 45 } 46 47 static void plugin_exit(qemu_plugin_id_t id, void *p) 48 { 49 g_autoptr(GString) report; 50 report = g_string_new("VCPU, interrupts, exceptions, hostcalls\n"); 51 int max_vcpus = qemu_plugin_num_vcpus(); 52 int vcpu; 53 54 for (vcpu = 0; vcpu < max_vcpus; vcpu++) { 55 TrapCounters *rec = qemu_plugin_scoreboard_find(traps, vcpu); 56 g_string_append_printf(report, 57 "% 4d, % 10"PRId64", % 10"PRId64", % 10"PRId64 58 "\n", vcpu, rec->interrupts, rec->exceptions, 59 rec->hostcalls); 60 } 61 62 qemu_plugin_outs(report->str); 63 qemu_plugin_scoreboard_free(traps); 64 } 65 66 QEMU_PLUGIN_EXPORT 67 int qemu_plugin_install(qemu_plugin_id_t id, const qemu_info_t *info, 68 int argc, char **argv) 69 { 70 if (!info->system_emulation) { 71 qemu_plugin_outs("Note: interrupts are only reported in system" 72 " emulation mode."); 73 } 74 75 traps = qemu_plugin_scoreboard_new(sizeof(TrapCounters)); 76 77 qemu_plugin_register_vcpu_discon_cb(id, QEMU_PLUGIN_DISCON_ALL, 78 vcpu_discon); 79 80 qemu_plugin_register_atexit_cb(id, plugin_exit, NULL); 81 82 return 0; 83 } 84