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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2002-2003 Hewlett-Packard Co | |
3 | * Stephane Eranian <eranian@hpl.hp.com> | |
4 | * | |
5 | * This file implements the default sampling buffer format | |
6 | * for the Linux/ia64 perfmon-2 subsystem. | |
7 | */ | |
8 | #include <linux/kernel.h> | |
9 | #include <linux/types.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/config.h> | |
12 | #include <linux/init.h> | |
13 | #include <asm/delay.h> | |
14 | #include <linux/smp.h> | |
15 | ||
16 | #include <asm/perfmon.h> | |
17 | #include <asm/perfmon_default_smpl.h> | |
18 | ||
19 | MODULE_AUTHOR("Stephane Eranian <eranian@hpl.hp.com>"); | |
20 | MODULE_DESCRIPTION("perfmon default sampling format"); | |
21 | MODULE_LICENSE("GPL"); | |
22 | ||
23 | MODULE_PARM(debug, "i"); | |
24 | MODULE_PARM_DESC(debug, "debug"); | |
25 | ||
26 | MODULE_PARM(debug_ovfl, "i"); | |
27 | MODULE_PARM_DESC(debug_ovfl, "debug ovfl"); | |
28 | ||
29 | ||
30 | #define DEFAULT_DEBUG 1 | |
31 | ||
32 | #ifdef DEFAULT_DEBUG | |
33 | #define DPRINT(a) \ | |
34 | do { \ | |
35 | if (unlikely(debug >0)) { printk("%s.%d: CPU%d ", __FUNCTION__, __LINE__, smp_processor_id()); printk a; } \ | |
36 | } while (0) | |
37 | ||
38 | #define DPRINT_ovfl(a) \ | |
39 | do { \ | |
40 | if (unlikely(debug_ovfl >0)) { printk("%s.%d: CPU%d ", __FUNCTION__, __LINE__, smp_processor_id()); printk a; } \ | |
41 | } while (0) | |
42 | ||
43 | #else | |
44 | #define DPRINT(a) | |
45 | #define DPRINT_ovfl(a) | |
46 | #endif | |
47 | ||
48 | static int debug, debug_ovfl; | |
49 | ||
50 | static int | |
51 | default_validate(struct task_struct *task, unsigned int flags, int cpu, void *data) | |
52 | { | |
53 | pfm_default_smpl_arg_t *arg = (pfm_default_smpl_arg_t*)data; | |
54 | int ret = 0; | |
55 | ||
56 | if (data == NULL) { | |
57 | DPRINT(("[%d] no argument passed\n", task->pid)); | |
58 | return -EINVAL; | |
59 | } | |
60 | ||
61 | DPRINT(("[%d] validate flags=0x%x CPU%d\n", task->pid, flags, cpu)); | |
62 | ||
63 | /* | |
64 | * must hold at least the buffer header + one minimally sized entry | |
65 | */ | |
66 | if (arg->buf_size < PFM_DEFAULT_SMPL_MIN_BUF_SIZE) return -EINVAL; | |
67 | ||
68 | DPRINT(("buf_size=%lu\n", arg->buf_size)); | |
69 | ||
70 | return ret; | |
71 | } | |
72 | ||
73 | static int | |
74 | default_get_size(struct task_struct *task, unsigned int flags, int cpu, void *data, unsigned long *size) | |
75 | { | |
76 | pfm_default_smpl_arg_t *arg = (pfm_default_smpl_arg_t *)data; | |
77 | ||
78 | /* | |
79 | * size has been validated in default_validate | |
80 | */ | |
81 | *size = arg->buf_size; | |
82 | ||
83 | return 0; | |
84 | } | |
85 | ||
86 | static int | |
87 | default_init(struct task_struct *task, void *buf, unsigned int flags, int cpu, void *data) | |
88 | { | |
89 | pfm_default_smpl_hdr_t *hdr; | |
90 | pfm_default_smpl_arg_t *arg = (pfm_default_smpl_arg_t *)data; | |
91 | ||
92 | hdr = (pfm_default_smpl_hdr_t *)buf; | |
93 | ||
94 | hdr->hdr_version = PFM_DEFAULT_SMPL_VERSION; | |
95 | hdr->hdr_buf_size = arg->buf_size; | |
96 | hdr->hdr_cur_offs = sizeof(*hdr); | |
97 | hdr->hdr_overflows = 0UL; | |
98 | hdr->hdr_count = 0UL; | |
99 | ||
100 | DPRINT(("[%d] buffer=%p buf_size=%lu hdr_size=%lu hdr_version=%u cur_offs=%lu\n", | |
101 | task->pid, | |
102 | buf, | |
103 | hdr->hdr_buf_size, | |
104 | sizeof(*hdr), | |
105 | hdr->hdr_version, | |
106 | hdr->hdr_cur_offs)); | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | static int | |
112 | default_handler(struct task_struct *task, void *buf, pfm_ovfl_arg_t *arg, struct pt_regs *regs, unsigned long stamp) | |
113 | { | |
114 | pfm_default_smpl_hdr_t *hdr; | |
115 | pfm_default_smpl_entry_t *ent; | |
116 | void *cur, *last; | |
117 | unsigned long *e, entry_size; | |
118 | unsigned int npmds, i; | |
119 | unsigned char ovfl_pmd; | |
120 | unsigned char ovfl_notify; | |
121 | ||
122 | if (unlikely(buf == NULL || arg == NULL|| regs == NULL || task == NULL)) { | |
123 | DPRINT(("[%d] invalid arguments buf=%p arg=%p\n", task->pid, buf, arg)); | |
124 | return -EINVAL; | |
125 | } | |
126 | ||
127 | hdr = (pfm_default_smpl_hdr_t *)buf; | |
128 | cur = buf+hdr->hdr_cur_offs; | |
129 | last = buf+hdr->hdr_buf_size; | |
130 | ovfl_pmd = arg->ovfl_pmd; | |
131 | ovfl_notify = arg->ovfl_notify; | |
132 | ||
133 | /* | |
134 | * precheck for sanity | |
135 | */ | |
136 | if ((last - cur) < PFM_DEFAULT_MAX_ENTRY_SIZE) goto full; | |
137 | ||
138 | npmds = hweight64(arg->smpl_pmds[0]); | |
139 | ||
140 | ent = (pfm_default_smpl_entry_t *)cur; | |
141 | ||
142 | prefetch(arg->smpl_pmds_values); | |
143 | ||
144 | entry_size = sizeof(*ent) + (npmds << 3); | |
145 | ||
146 | /* position for first pmd */ | |
147 | e = (unsigned long *)(ent+1); | |
148 | ||
149 | hdr->hdr_count++; | |
150 | ||
151 | DPRINT_ovfl(("[%d] count=%lu cur=%p last=%p free_bytes=%lu ovfl_pmd=%d ovfl_notify=%d npmds=%u\n", | |
152 | task->pid, | |
153 | hdr->hdr_count, | |
154 | cur, last, | |
155 | last-cur, | |
156 | ovfl_pmd, | |
157 | ovfl_notify, npmds)); | |
158 | ||
159 | /* | |
160 | * current = task running at the time of the overflow. | |
161 | * | |
162 | * per-task mode: | |
163 | * - this is ususally the task being monitored. | |
164 | * Under certain conditions, it might be a different task | |
165 | * | |
166 | * system-wide: | |
167 | * - this is not necessarily the task controlling the session | |
168 | */ | |
169 | ent->pid = current->pid; | |
170 | ent->ovfl_pmd = ovfl_pmd; | |
171 | ent->last_reset_val = arg->pmd_last_reset; //pmd[0].reg_last_reset_val; | |
172 | ||
173 | /* | |
174 | * where did the fault happen (includes slot number) | |
175 | */ | |
176 | ent->ip = regs->cr_iip | ((regs->cr_ipsr >> 41) & 0x3); | |
177 | ||
178 | ent->tstamp = stamp; | |
179 | ent->cpu = smp_processor_id(); | |
180 | ent->set = arg->active_set; | |
181 | ent->tgid = current->tgid; | |
182 | ||
183 | /* | |
184 | * selectively store PMDs in increasing index number | |
185 | */ | |
186 | if (npmds) { | |
187 | unsigned long *val = arg->smpl_pmds_values; | |
188 | for(i=0; i < npmds; i++) { | |
189 | *e++ = *val++; | |
190 | } | |
191 | } | |
192 | ||
193 | /* | |
194 | * update position for next entry | |
195 | */ | |
196 | hdr->hdr_cur_offs += entry_size; | |
197 | cur += entry_size; | |
198 | ||
199 | /* | |
200 | * post check to avoid losing the last sample | |
201 | */ | |
202 | if ((last - cur) < PFM_DEFAULT_MAX_ENTRY_SIZE) goto full; | |
203 | ||
204 | /* | |
205 | * keep same ovfl_pmds, ovfl_notify | |
206 | */ | |
207 | arg->ovfl_ctrl.bits.notify_user = 0; | |
208 | arg->ovfl_ctrl.bits.block_task = 0; | |
209 | arg->ovfl_ctrl.bits.mask_monitoring = 0; | |
210 | arg->ovfl_ctrl.bits.reset_ovfl_pmds = 1; /* reset before returning from interrupt handler */ | |
211 | ||
212 | return 0; | |
213 | full: | |
214 | DPRINT_ovfl(("sampling buffer full free=%lu, count=%lu, ovfl_notify=%d\n", last-cur, hdr->hdr_count, ovfl_notify)); | |
215 | ||
216 | /* | |
217 | * increment number of buffer overflow. | |
218 | * important to detect duplicate set of samples. | |
219 | */ | |
220 | hdr->hdr_overflows++; | |
221 | ||
222 | /* | |
223 | * if no notification requested, then we saturate the buffer | |
224 | */ | |
225 | if (ovfl_notify == 0) { | |
226 | arg->ovfl_ctrl.bits.notify_user = 0; | |
227 | arg->ovfl_ctrl.bits.block_task = 0; | |
228 | arg->ovfl_ctrl.bits.mask_monitoring = 1; | |
229 | arg->ovfl_ctrl.bits.reset_ovfl_pmds = 0; | |
230 | } else { | |
231 | arg->ovfl_ctrl.bits.notify_user = 1; | |
232 | arg->ovfl_ctrl.bits.block_task = 1; /* ignored for non-blocking context */ | |
233 | arg->ovfl_ctrl.bits.mask_monitoring = 1; | |
234 | arg->ovfl_ctrl.bits.reset_ovfl_pmds = 0; /* no reset now */ | |
235 | } | |
236 | return -1; /* we are full, sorry */ | |
237 | } | |
238 | ||
239 | static int | |
240 | default_restart(struct task_struct *task, pfm_ovfl_ctrl_t *ctrl, void *buf, struct pt_regs *regs) | |
241 | { | |
242 | pfm_default_smpl_hdr_t *hdr; | |
243 | ||
244 | hdr = (pfm_default_smpl_hdr_t *)buf; | |
245 | ||
246 | hdr->hdr_count = 0UL; | |
247 | hdr->hdr_cur_offs = sizeof(*hdr); | |
248 | ||
249 | ctrl->bits.mask_monitoring = 0; | |
250 | ctrl->bits.reset_ovfl_pmds = 1; /* uses long-reset values */ | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | static int | |
256 | default_exit(struct task_struct *task, void *buf, struct pt_regs *regs) | |
257 | { | |
258 | DPRINT(("[%d] exit(%p)\n", task->pid, buf)); | |
259 | return 0; | |
260 | } | |
261 | ||
262 | static pfm_buffer_fmt_t default_fmt={ | |
263 | .fmt_name = "default_format", | |
264 | .fmt_uuid = PFM_DEFAULT_SMPL_UUID, | |
265 | .fmt_arg_size = sizeof(pfm_default_smpl_arg_t), | |
266 | .fmt_validate = default_validate, | |
267 | .fmt_getsize = default_get_size, | |
268 | .fmt_init = default_init, | |
269 | .fmt_handler = default_handler, | |
270 | .fmt_restart = default_restart, | |
271 | .fmt_restart_active = default_restart, | |
272 | .fmt_exit = default_exit, | |
273 | }; | |
274 | ||
275 | static int __init | |
276 | pfm_default_smpl_init_module(void) | |
277 | { | |
278 | int ret; | |
279 | ||
280 | ret = pfm_register_buffer_fmt(&default_fmt); | |
281 | if (ret == 0) { | |
282 | printk("perfmon_default_smpl: %s v%u.%u registered\n", | |
283 | default_fmt.fmt_name, | |
284 | PFM_DEFAULT_SMPL_VERSION_MAJ, | |
285 | PFM_DEFAULT_SMPL_VERSION_MIN); | |
286 | } else { | |
287 | printk("perfmon_default_smpl: %s cannot register ret=%d\n", | |
288 | default_fmt.fmt_name, | |
289 | ret); | |
290 | } | |
291 | ||
292 | return ret; | |
293 | } | |
294 | ||
295 | static void __exit | |
296 | pfm_default_smpl_cleanup_module(void) | |
297 | { | |
298 | int ret; | |
299 | ret = pfm_unregister_buffer_fmt(default_fmt.fmt_uuid); | |
300 | ||
301 | printk("perfmon_default_smpl: unregister %s=%d\n", default_fmt.fmt_name, ret); | |
302 | } | |
303 | ||
304 | module_init(pfm_default_smpl_init_module); | |
305 | module_exit(pfm_default_smpl_cleanup_module); | |
306 |