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 static uint64_t inline_mem_count;
  20 static uint64_t cb_mem_count;
  21 static uint64_t io_count;
  22 static bool do_inline, do_callback;
  23 static bool do_haddr;
  24 static enum qemu_plugin_mem_rw rw = QEMU_PLUGIN_MEM_RW;
  25
  26 static void plugin_exit(qemu_plugin_id_t id, void *p)
  27 {
  28     g_autoptr(GString) out = g_string_new("");
  29
  30     if (do_inline) {
  31         g_string_printf(out, "inline mem accesses: %" PRIu64 "\n", inline_mem_count);
  32     }
  33     if (do_callback) {
  34         g_string_append_printf(out, "callback mem accesses: %" PRIu64 "\n", cb_mem_count);
  35     }
  36     if (do_haddr) {
  37         g_string_append_printf(out, "io accesses: %" PRIu64 "\n", io_count);
  38     }
  39     qemu_plugin_outs(out->str);
  40 }
  41
  42 static void vcpu_mem(unsigned int cpu_index, qemu_plugin_meminfo_t meminfo,
  43                      uint64_t vaddr, void *udata)
  44 {
  45     if (do_haddr) {
  46         struct qemu_plugin_hwaddr *hwaddr;
  47         hwaddr = qemu_plugin_get_hwaddr(meminfo, vaddr);
  48         if (qemu_plugin_hwaddr_is_io(hwaddr)) {
  49             io_count++;
  50         } else {
  51             cb_mem_count++;
  52         }
  53     } else {
  54         cb_mem_count++;
  55     }
  56 }
  57
  58 static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
  59 {
  60     size_t n = qemu_plugin_tb_n_insns(tb);
  61     size_t i;
  62
  63     for (i = 0; i < n; i++) {
  64         struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, i);
  65
  66         if (do_inline) {
  67             qemu_plugin_register_vcpu_mem_inline(insn, rw,
  68                                                  QEMU_PLUGIN_INLINE_ADD_U64,
  69                                                  &inline_mem_count, 1);
  70         }
  71         if (do_callback) {
  72             qemu_plugin_register_vcpu_mem_cb(insn, vcpu_mem,
  73                                              QEMU_PLUGIN_CB_NO_REGS,
  74                                              rw, NULL);
  75         }
  76     }
  77 }
  78
  79 QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
  80                                            const qemu_info_t *info,
  81                                            int argc, char **argv)
  82 {
  83     if (argc) {
  84         if (argc >= 3) {
  85             if (!strcmp(argv[2], "haddr")) {
  86                 do_haddr = true;
  87             }
  88         }
  89         if (argc >= 2) {
  90             const char *str = argv[1];
  91
  92             if (!strcmp(str, "r")) {
  93                 rw = QEMU_PLUGIN_MEM_R;
  94             } else if (!strcmp(str, "w")) {
  95                 rw = QEMU_PLUGIN_MEM_W;
  96             }
  97         }
  98         if (!strcmp(argv[0], "inline")) {
  99             do_inline = true;
 100             do_callback = false;
 101         } else if (!strcmp(argv[0], "both")) {
 102             do_inline = true;
 103             do_callback = true;
 104         } else {
 105             do_callback = true;
 106         }
 107     }
 108
 109     qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
 110     qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
 111     return 0;
 112 }