1 | /****************************************************************************** |
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2 | * perfmon.c for xenoprof |
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3 | * This is based linux/arch/ia64/oprofile/perfmon.c, but heavily rewritten. |
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4 | * |
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5 | * Copyright (c) 2006 Isaku Yamahata <yamahata at valinux co jp> |
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6 | * VA Linux Systems Japan K.K. |
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7 | * |
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8 | * This program is free software; you can redistribute it and/or modify |
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9 | * it under the terms of the GNU General Public License as published by |
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10 | * the Free Software Foundation; either version 2 of the License, or |
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11 | * (at your option) any later version. |
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12 | * |
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13 | * This program is distributed in the hope that it will be useful, |
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | * GNU General Public License for more details. |
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17 | * |
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18 | * You should have received a copy of the GNU General Public License |
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19 | * along with this program; if not, write to the Free Software |
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20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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21 | * |
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22 | */ |
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23 | /** |
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24 | * @file perfmon.c |
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25 | * |
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26 | * @remark Copyright 2003 OProfile authors |
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27 | * @remark Read the file COPYING |
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28 | * |
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29 | * @author John Levon <levon@movementarian.org> |
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30 | */ |
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31 | |
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32 | #include <xen/config.h> |
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33 | #include <xen/sched.h> |
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34 | #include <xen/event.h> |
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35 | #include <xen/xenoprof.h> |
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36 | #include <asm/perfmon.h> |
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37 | #include <asm/ptrace.h> |
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38 | |
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39 | // XXX move them to an appropriate header file |
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40 | extern void xenoprof_log_event(struct vcpu *vcpu, |
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41 | unsigned long eip, int mode, int event); |
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42 | extern int is_active(struct domain *d); |
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43 | |
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44 | static int allow_virq; |
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45 | static int allow_ints; |
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46 | |
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47 | static int |
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48 | xenoprof_handler(struct task_struct *task, void *buf, pfm_ovfl_arg_t *arg, |
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49 | struct pt_regs *regs, unsigned long stamp) |
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50 | { |
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51 | unsigned long ip = regs->cr_iip; |
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52 | int event = arg->pmd_eventid; |
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53 | |
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54 | arg->ovfl_ctrl.bits.reset_ovfl_pmds = 1; |
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55 | if (!allow_virq || !allow_ints) |
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56 | return 0; |
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57 | |
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58 | xenoprof_log_event(current, ip, xenoprofile_get_mode(task, regs), event); |
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59 | |
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60 | // send VIRQ_XENOPROF |
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61 | if (is_active(current->domain) && !ring_0(regs)) |
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62 | send_guest_vcpu_virq(current, VIRQ_XENOPROF); |
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63 | |
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64 | return 0; |
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65 | } |
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66 | |
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67 | // same as linux OPROFILE_FMT_UUID |
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68 | #define XENOPROF_FMT_UUID { \ |
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69 | 0x77, 0x7a, 0x6e, 0x61, 0x20, 0x65, 0x73, 0x69, 0x74, 0x6e, 0x72, 0x20, 0x61, 0x65, 0x0a, 0x6c } |
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70 | |
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71 | static pfm_buffer_fmt_t xenoprof_fmt = { |
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72 | .fmt_name = "xenoprof_format", |
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73 | .fmt_uuid = XENOPROF_FMT_UUID, |
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74 | .fmt_handler = xenoprof_handler, |
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75 | }; |
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76 | |
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77 | static char * get_cpu_type(void) |
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78 | { |
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79 | __u8 family = local_cpu_data->family; |
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80 | |
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81 | switch (family) { |
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82 | case 0x07: |
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83 | return "ia64/itanium"; |
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84 | case 0x1f: |
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85 | return "ia64/itanium2"; |
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86 | default: |
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87 | return "ia64/ia64"; |
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88 | } |
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89 | } |
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90 | |
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91 | static int using_xenoprof; |
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92 | |
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93 | int __init |
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94 | xenprof_perfmon_init(void) |
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95 | { |
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96 | int ret = pfm_register_buffer_fmt(&xenoprof_fmt); |
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97 | if (ret) |
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98 | return -ENODEV; |
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99 | using_xenoprof = 1; |
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100 | printk("xenoprof: using perfmon.\n"); |
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101 | return 0; |
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102 | } |
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103 | __initcall(xenprof_perfmon_init); |
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104 | |
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105 | #ifdef notyet |
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106 | void xenoprof_perfmon_exit(void) |
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107 | { |
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108 | if (!using_xenoprof) |
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109 | return; |
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110 | |
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111 | pfm_unregister_buffer_fmt(xenoprof_fmt.fmt_uuid); |
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112 | } |
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113 | __exitcall(xenoprof_perfmon_exit); |
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114 | #endif |
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115 | |
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116 | /////////////////////////////////////////////////////////////////////////// |
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117 | // glue methods for xenoprof and perfmon. |
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118 | int |
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119 | xenoprof_arch_init(int *num_events, int *is_primary, char *cpu_type) |
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120 | { |
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121 | *num_events = 0; |
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122 | strlcpy(cpu_type, get_cpu_type(), XENOPROF_CPU_TYPE_SIZE); |
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123 | |
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124 | *is_primary = 0; |
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125 | if (xenoprof_primary_profiler == NULL) { |
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126 | /* For now, only dom0 can be the primary profiler */ |
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127 | if (current->domain->domain_id == 0) { |
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128 | *is_primary = 1; |
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129 | } |
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130 | } else if (xenoprof_primary_profiler == current->domain) |
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131 | *is_primary = 1; |
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132 | return 0; |
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133 | } |
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134 | |
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135 | int |
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136 | xenoprof_arch_reserve_counters(void) |
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137 | { |
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138 | // perfmon takes care |
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139 | return 0; |
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140 | } |
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141 | |
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142 | int |
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143 | xenoprof_arch_counter(XEN_GUEST_HANDLE(void) arg) |
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144 | { |
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145 | return -ENOSYS; |
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146 | } |
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147 | |
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148 | int |
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149 | xenoprof_arch_setup_events(void) |
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150 | { |
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151 | // perfmon takes care |
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152 | return 0; |
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153 | } |
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154 | |
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155 | //XXX SMP: sync by IPI? |
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156 | int |
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157 | xenoprof_arch_enable_virq(void) |
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158 | { |
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159 | allow_virq = 1; |
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160 | return 0; |
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161 | } |
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162 | |
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163 | //XXX SMP: sync by IPI? |
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164 | int |
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165 | xenoprof_arch_start(void) |
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166 | { |
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167 | allow_ints = 1; |
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168 | return 0; |
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169 | } |
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170 | |
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171 | //XXX SMP: sync by IPI? |
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172 | void |
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173 | xenoprof_arch_stop(void) |
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174 | { |
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175 | allow_ints = 0; |
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176 | } |
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177 | |
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178 | //XXX SMP: sync by IPI? |
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179 | void |
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180 | xenoprof_arch_disable_virq(void) |
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181 | { |
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182 | allow_virq = 0; |
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183 | } |
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184 | |
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185 | void |
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186 | xenoprof_arch_release_counters(void) |
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187 | { |
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188 | // perfmon takes care |
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189 | } |
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190 | |
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191 | /* |
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192 | * Local variables: |
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193 | * mode: C |
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194 | * c-set-style: "BSD" |
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195 | * c-basic-offset: 4 |
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196 | * tab-width: 4 |
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197 | * indent-tabs-mode: nil |
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198 | * End: |
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199 | */ |
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