tests/plugin/mem.c

   1 /*
   2  * Copyright (C) 2018, Emilio G. Cota <cota@braap.org>
   3  *
   4  * License: GNU GPL, version 2 or later.
   5  *   See the COPYING file in the top-level directory.
   6  */
   7 #include <inttypes.h>
   8 #include <assert.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <unistd.h>
  12 #include <stdio.h>
  13 #include <glib.h>
  14
  15 #include <qemu-plugin.h>
  16
  17 QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
  18
  19 typedef struct {
  20     uint64_t mem_count;
  21     uint64_t io_count;
  22 } CPUCount;
  23
  24 static struct qemu_plugin_scoreboard *counts;
  25 static qemu_plugin_u64 mem_count;
  26 static qemu_plugin_u64 io_count;
  27 static bool do_inline, do_callback;
  28 static bool do_haddr;
  29 static enum qemu_plugin_mem_rw rw = QEMU_PLUGIN_MEM_RW;
  30
  31 static void plugin_exit(qemu_plugin_id_t id, void *p)
  32 {
  33     g_autoptr(GString) out = g_string_new("");
  34
  35     if (do_inline || do_callback) {
  36         g_string_printf(out, "mem accesses: %" PRIu64 "\n",
  37                         qemu_plugin_u64_sum(mem_count));
  38     }
  39     if (do_haddr) {
  40         g_string_append_printf(out, "io accesses: %" PRIu64 "\n",
  41                                qemu_plugin_u64_sum(io_count));
  42     }
  43     qemu_plugin_outs(out->str);
  44     qemu_plugin_scoreboard_free(counts);
  45 }
  46
  47 static void vcpu_mem(unsigned int cpu_index, qemu_plugin_meminfo_t meminfo,
  48                      uint64_t vaddr, void *udata)
  49 {
  50     if (do_haddr) {
  51         struct qemu_plugin_hwaddr *hwaddr;
  52         hwaddr = qemu_plugin_get_hwaddr(meminfo, vaddr);
  53         if (qemu_plugin_hwaddr_is_io(hwaddr)) {
  54             qemu_plugin_u64_add(io_count, cpu_index, 1);
  55         } else {
  56             qemu_plugin_u64_add(mem_count, cpu_index, 1);
  57         }
  58     } else {
  59         qemu_plugin_u64_add(mem_count, cpu_index, 1);
  60     }
  61 }
  62
  63 static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
  64 {
  65     size_t n = qemu_plugin_tb_n_insns(tb);
  66     size_t i;
  67
  68     for (i = 0; i < n; i++) {
  69         struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, i);
  70
  71         if (do_inline) {
  72             qemu_plugin_register_vcpu_mem_inline_per_vcpu(
  73                 insn, rw,
  74                 QEMU_PLUGIN_INLINE_ADD_U64,
  75                 mem_count, 1);
  76         }
  77         if (do_callback) {
  78             qemu_plugin_register_vcpu_mem_cb(insn, vcpu_mem,
  79                                              QEMU_PLUGIN_CB_NO_REGS,
  80                                              rw, NULL);
  81         }
  82     }
  83 }
  84
  85 QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
  86                                            const qemu_info_t *info,
  87                                            int argc, char **argv)
  88 {
  89
  90     for (int i = 0; i < argc; i++) {
  91         char *opt = argv[i];
  92         g_auto(GStrv) tokens = g_strsplit(opt, "=", 2);
  93
  94         if (g_strcmp0(tokens[0], "haddr") == 0) {
  95             if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_haddr)) {
  96                 fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
  97                 return -1;
  98             }
  99         } else if (g_strcmp0(tokens[0], "track") == 0) {
 100             if (g_strcmp0(tokens[1], "r") == 0) {
 101                 rw = QEMU_PLUGIN_MEM_R;
 102             } else if (g_strcmp0(tokens[1], "w") == 0) {
 103                 rw = QEMU_PLUGIN_MEM_W;
 104             } else if (g_strcmp0(tokens[1], "rw") == 0) {
 105                 rw = QEMU_PLUGIN_MEM_RW;
 106             } else {
 107                 fprintf(stderr, "invalid value for argument track: %s\n", opt);
 108                 return -1;
 109             }
 110         } else if (g_strcmp0(tokens[0], "inline") == 0) {
 111             if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_inline)) {
 112                 fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
 113                 return -1;
 114             }
 115         } else if (g_strcmp0(tokens[0], "callback") == 0) {
 116             if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_callback)) {
 117                 fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
 118                 return -1;
 119             }
 120         } else {
 121             fprintf(stderr, "option parsing failed: %s\n", opt);
 122             return -1;
 123         }
 124     }
 125
 126     if (do_inline && do_callback) {
 127         fprintf(stderr,
 128                 "can't enable inline and callback counting at the same time\n");
 129         return -1;
 130     }
 131
 132     counts = qemu_plugin_scoreboard_new(sizeof(CPUCount));
 133     mem_count = qemu_plugin_scoreboard_u64_in_struct(
 134         counts, CPUCount, mem_count);
 135     io_count = qemu_plugin_scoreboard_u64_in_struct(counts, CPUCount, io_count);
 136     qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
 137     qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
 138     return 0;
 139 }