1 | /* |
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2 | * Copyright (C) 2002-2003 Hewlett-Packard Co |
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3 | * Stephane Eranian <eranian@hpl.hp.com> |
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4 | * |
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5 | * This file implements the default sampling buffer format |
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6 | * for the Linux/ia64 perfmon-2 subsystem. |
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7 | */ |
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8 | #include <linux/kernel.h> |
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9 | #include <linux/types.h> |
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10 | #include <linux/module.h> |
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11 | #include <linux/config.h> |
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12 | #include <linux/init.h> |
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13 | #include <asm/delay.h> |
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14 | #include <linux/smp.h> |
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15 | |
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16 | #include <asm/perfmon.h> |
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17 | #include <asm/perfmon_default_smpl.h> |
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18 | |
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19 | #ifndef XEN |
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20 | MODULE_AUTHOR("Stephane Eranian <eranian@hpl.hp.com>"); |
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21 | MODULE_DESCRIPTION("perfmon default sampling format"); |
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22 | MODULE_LICENSE("GPL"); |
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23 | #endif |
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24 | |
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25 | #ifdef XEN |
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26 | #define pid vcpu_id |
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27 | #endif |
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28 | |
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29 | #define DEFAULT_DEBUG 1 |
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30 | |
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31 | #ifdef DEFAULT_DEBUG |
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32 | #define DPRINT(a) \ |
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33 | do { \ |
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34 | if (unlikely(pfm_sysctl.debug >0)) { printk("%s.%d: CPU%d ", __FUNCTION__, __LINE__, smp_processor_id()); printk a; } \ |
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35 | } while (0) |
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36 | |
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37 | #define DPRINT_ovfl(a) \ |
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38 | do { \ |
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39 | if (unlikely(pfm_sysctl.debug > 0 && pfm_sysctl.debug_ovfl >0)) { printk("%s.%d: CPU%d ", __FUNCTION__, __LINE__, smp_processor_id()); printk a; } \ |
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40 | } while (0) |
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41 | |
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42 | #else |
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43 | #define DPRINT(a) |
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44 | #define DPRINT_ovfl(a) |
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45 | #endif |
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46 | |
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47 | static int |
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48 | default_validate(struct task_struct *task, unsigned int flags, int cpu, void *data) |
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49 | { |
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50 | pfm_default_smpl_arg_t *arg = (pfm_default_smpl_arg_t*)data; |
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51 | int ret = 0; |
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52 | |
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53 | if (data == NULL) { |
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54 | DPRINT(("[%d] no argument passed\n", task->pid)); |
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55 | return -EINVAL; |
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56 | } |
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57 | |
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58 | DPRINT(("[%d] validate flags=0x%x CPU%d\n", task->pid, flags, cpu)); |
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59 | |
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60 | /* |
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61 | * must hold at least the buffer header + one minimally sized entry |
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62 | */ |
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63 | if (arg->buf_size < PFM_DEFAULT_SMPL_MIN_BUF_SIZE) return -EINVAL; |
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64 | |
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65 | DPRINT(("buf_size=%lu\n", arg->buf_size)); |
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66 | |
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67 | return ret; |
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68 | } |
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69 | |
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70 | static int |
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71 | default_get_size(struct task_struct *task, unsigned int flags, int cpu, void *data, unsigned long *size) |
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72 | { |
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73 | pfm_default_smpl_arg_t *arg = (pfm_default_smpl_arg_t *)data; |
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74 | |
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75 | /* |
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76 | * size has been validated in default_validate |
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77 | */ |
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78 | *size = arg->buf_size; |
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79 | |
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80 | return 0; |
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81 | } |
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82 | |
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83 | static int |
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84 | default_init(struct task_struct *task, void *buf, unsigned int flags, int cpu, void *data) |
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85 | { |
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86 | pfm_default_smpl_hdr_t *hdr; |
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87 | pfm_default_smpl_arg_t *arg = (pfm_default_smpl_arg_t *)data; |
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88 | |
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89 | hdr = (pfm_default_smpl_hdr_t *)buf; |
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90 | |
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91 | hdr->hdr_version = PFM_DEFAULT_SMPL_VERSION; |
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92 | hdr->hdr_buf_size = arg->buf_size; |
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93 | hdr->hdr_cur_offs = sizeof(*hdr); |
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94 | hdr->hdr_overflows = 0UL; |
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95 | hdr->hdr_count = 0UL; |
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96 | |
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97 | DPRINT(("[%d] buffer=%p buf_size=%lu hdr_size=%lu hdr_version=%u cur_offs=%lu\n", |
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98 | task->pid, |
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99 | buf, |
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100 | hdr->hdr_buf_size, |
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101 | sizeof(*hdr), |
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102 | hdr->hdr_version, |
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103 | hdr->hdr_cur_offs)); |
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104 | |
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105 | return 0; |
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106 | } |
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107 | |
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108 | static int |
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109 | default_handler(struct task_struct *task, void *buf, pfm_ovfl_arg_t *arg, struct pt_regs *regs, unsigned long stamp) |
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110 | { |
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111 | pfm_default_smpl_hdr_t *hdr; |
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112 | pfm_default_smpl_entry_t *ent; |
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113 | void *cur, *last; |
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114 | unsigned long *e, entry_size; |
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115 | unsigned int npmds, i; |
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116 | unsigned char ovfl_pmd; |
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117 | unsigned char ovfl_notify; |
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118 | |
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119 | if (unlikely(buf == NULL || arg == NULL|| regs == NULL || task == NULL)) { |
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120 | DPRINT(("[%d] invalid arguments buf=%p arg=%p\n", task->pid, buf, arg)); |
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121 | return -EINVAL; |
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122 | } |
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123 | |
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124 | hdr = (pfm_default_smpl_hdr_t *)buf; |
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125 | cur = buf+hdr->hdr_cur_offs; |
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126 | last = buf+hdr->hdr_buf_size; |
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127 | ovfl_pmd = arg->ovfl_pmd; |
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128 | ovfl_notify = arg->ovfl_notify; |
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129 | |
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130 | /* |
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131 | * precheck for sanity |
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132 | */ |
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133 | if ((last - cur) < PFM_DEFAULT_MAX_ENTRY_SIZE) goto full; |
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134 | |
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135 | npmds = hweight64(arg->smpl_pmds[0]); |
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136 | |
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137 | ent = (pfm_default_smpl_entry_t *)cur; |
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138 | |
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139 | prefetch(arg->smpl_pmds_values); |
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140 | |
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141 | entry_size = sizeof(*ent) + (npmds << 3); |
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142 | |
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143 | /* position for first pmd */ |
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144 | e = (unsigned long *)(ent+1); |
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145 | |
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146 | hdr->hdr_count++; |
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147 | |
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148 | DPRINT_ovfl(("[%d] count=%lu cur=%p last=%p free_bytes=%lu ovfl_pmd=%d ovfl_notify=%d npmds=%u\n", |
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149 | task->pid, |
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150 | hdr->hdr_count, |
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151 | cur, last, |
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152 | last-cur, |
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153 | ovfl_pmd, |
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154 | ovfl_notify, npmds)); |
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155 | |
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156 | /* |
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157 | * current = task running at the time of the overflow. |
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158 | * |
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159 | * per-task mode: |
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160 | * - this is ususally the task being monitored. |
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161 | * Under certain conditions, it might be a different task |
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162 | * |
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163 | * system-wide: |
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164 | * - this is not necessarily the task controlling the session |
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165 | */ |
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166 | #ifndef XEN |
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167 | ent->pid = current->pid; |
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168 | #endif |
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169 | ent->ovfl_pmd = ovfl_pmd; |
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170 | ent->last_reset_val = arg->pmd_last_reset; //pmd[0].reg_last_reset_val; |
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171 | |
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172 | /* |
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173 | * where did the fault happen (includes slot number) |
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174 | */ |
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175 | ent->ip = regs->cr_iip | ((regs->cr_ipsr >> 41) & 0x3); |
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176 | |
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177 | ent->tstamp = stamp; |
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178 | ent->cpu = smp_processor_id(); |
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179 | ent->set = arg->active_set; |
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180 | #ifndef XEN |
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181 | ent->tgid = current->tgid; |
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182 | #endif |
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183 | |
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184 | /* |
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185 | * selectively store PMDs in increasing index number |
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186 | */ |
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187 | if (npmds) { |
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188 | unsigned long *val = arg->smpl_pmds_values; |
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189 | for(i=0; i < npmds; i++) { |
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190 | *e++ = *val++; |
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191 | } |
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192 | } |
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193 | |
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194 | /* |
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195 | * update position for next entry |
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196 | */ |
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197 | hdr->hdr_cur_offs += entry_size; |
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198 | cur += entry_size; |
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199 | |
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200 | /* |
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201 | * post check to avoid losing the last sample |
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202 | */ |
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203 | if ((last - cur) < PFM_DEFAULT_MAX_ENTRY_SIZE) goto full; |
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204 | |
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205 | /* |
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206 | * keep same ovfl_pmds, ovfl_notify |
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207 | */ |
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208 | arg->ovfl_ctrl.bits.notify_user = 0; |
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209 | arg->ovfl_ctrl.bits.block_task = 0; |
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210 | arg->ovfl_ctrl.bits.mask_monitoring = 0; |
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211 | arg->ovfl_ctrl.bits.reset_ovfl_pmds = 1; /* reset before returning from interrupt handler */ |
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212 | |
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213 | return 0; |
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214 | full: |
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215 | DPRINT_ovfl(("sampling buffer full free=%lu, count=%lu, ovfl_notify=%d\n", last-cur, hdr->hdr_count, ovfl_notify)); |
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216 | |
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217 | /* |
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218 | * increment number of buffer overflow. |
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219 | * important to detect duplicate set of samples. |
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220 | */ |
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221 | hdr->hdr_overflows++; |
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222 | |
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223 | /* |
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224 | * if no notification requested, then we saturate the buffer |
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225 | */ |
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226 | if (ovfl_notify == 0) { |
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227 | arg->ovfl_ctrl.bits.notify_user = 0; |
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228 | arg->ovfl_ctrl.bits.block_task = 0; |
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229 | arg->ovfl_ctrl.bits.mask_monitoring = 1; |
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230 | arg->ovfl_ctrl.bits.reset_ovfl_pmds = 0; |
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231 | } else { |
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232 | arg->ovfl_ctrl.bits.notify_user = 1; |
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233 | arg->ovfl_ctrl.bits.block_task = 1; /* ignored for non-blocking context */ |
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234 | arg->ovfl_ctrl.bits.mask_monitoring = 1; |
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235 | arg->ovfl_ctrl.bits.reset_ovfl_pmds = 0; /* no reset now */ |
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236 | } |
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237 | return -1; /* we are full, sorry */ |
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238 | } |
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239 | |
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240 | static int |
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241 | default_restart(struct task_struct *task, pfm_ovfl_ctrl_t *ctrl, void *buf, struct pt_regs *regs) |
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242 | { |
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243 | pfm_default_smpl_hdr_t *hdr; |
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244 | |
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245 | hdr = (pfm_default_smpl_hdr_t *)buf; |
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246 | |
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247 | hdr->hdr_count = 0UL; |
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248 | hdr->hdr_cur_offs = sizeof(*hdr); |
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249 | |
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250 | ctrl->bits.mask_monitoring = 0; |
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251 | ctrl->bits.reset_ovfl_pmds = 1; /* uses long-reset values */ |
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252 | |
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253 | return 0; |
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254 | } |
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255 | |
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256 | static int |
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257 | default_exit(struct task_struct *task, void *buf, struct pt_regs *regs) |
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258 | { |
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259 | DPRINT(("[%d] exit(%p)\n", task->pid, buf)); |
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260 | return 0; |
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261 | } |
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262 | |
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263 | static pfm_buffer_fmt_t default_fmt={ |
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264 | .fmt_name = "default_format", |
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265 | .fmt_uuid = PFM_DEFAULT_SMPL_UUID, |
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266 | .fmt_arg_size = sizeof(pfm_default_smpl_arg_t), |
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267 | .fmt_validate = default_validate, |
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268 | .fmt_getsize = default_get_size, |
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269 | .fmt_init = default_init, |
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270 | .fmt_handler = default_handler, |
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271 | .fmt_restart = default_restart, |
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272 | .fmt_restart_active = default_restart, |
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273 | .fmt_exit = default_exit, |
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274 | }; |
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275 | |
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276 | #ifndef XEN |
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277 | static int __init |
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278 | pfm_default_smpl_init_module(void) |
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279 | { |
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280 | int ret; |
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281 | |
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282 | ret = pfm_register_buffer_fmt(&default_fmt); |
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283 | if (ret == 0) { |
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284 | printk("perfmon_default_smpl: %s v%u.%u registered\n", |
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285 | default_fmt.fmt_name, |
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286 | PFM_DEFAULT_SMPL_VERSION_MAJ, |
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287 | PFM_DEFAULT_SMPL_VERSION_MIN); |
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288 | } else { |
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289 | printk("perfmon_default_smpl: %s cannot register ret=%d\n", |
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290 | default_fmt.fmt_name, |
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291 | ret); |
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292 | } |
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293 | |
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294 | return ret; |
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295 | } |
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296 | #endif |
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297 | |
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298 | static void __exit |
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299 | pfm_default_smpl_cleanup_module(void) |
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300 | { |
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301 | int ret; |
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302 | ret = pfm_unregister_buffer_fmt(default_fmt.fmt_uuid); |
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303 | |
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304 | printk("perfmon_default_smpl: unregister %s=%d\n", default_fmt.fmt_name, ret); |
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305 | } |
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306 | |
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307 | #ifndef XEN |
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308 | module_init(pfm_default_smpl_init_module); |
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309 | module_exit(pfm_default_smpl_cleanup_module); |
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310 | #endif |
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311 | |
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