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Linux kernel mirror (for testing)
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linux
1/*
2 * Copyright (C) 2001-2003 Hewlett-Packard Co
3 * Stephane Eranian <eranian@hpl.hp.com>
4 */
5
6#ifndef _ASM_IA64_PERFMON_H
7#define _ASM_IA64_PERFMON_H
8
9/*
10 * perfmon comamnds supported on all CPU models
11 */
12#define PFM_WRITE_PMCS 0x01
13#define PFM_WRITE_PMDS 0x02
14#define PFM_READ_PMDS 0x03
15#define PFM_STOP 0x04
16#define PFM_START 0x05
17#define PFM_ENABLE 0x06 /* obsolete */
18#define PFM_DISABLE 0x07 /* obsolete */
19#define PFM_CREATE_CONTEXT 0x08
20#define PFM_DESTROY_CONTEXT 0x09 /* obsolete use close() */
21#define PFM_RESTART 0x0a
22#define PFM_PROTECT_CONTEXT 0x0b /* obsolete */
23#define PFM_GET_FEATURES 0x0c
24#define PFM_DEBUG 0x0d
25#define PFM_UNPROTECT_CONTEXT 0x0e /* obsolete */
26#define PFM_GET_PMC_RESET_VAL 0x0f
27#define PFM_LOAD_CONTEXT 0x10
28#define PFM_UNLOAD_CONTEXT 0x11
29
30/*
31 * PMU model specific commands (may not be supported on all PMU models)
32 */
33#define PFM_WRITE_IBRS 0x20
34#define PFM_WRITE_DBRS 0x21
35
36/*
37 * context flags
38 */
39#define PFM_FL_NOTIFY_BLOCK 0x01 /* block task on user level notifications */
40#define PFM_FL_SYSTEM_WIDE 0x02 /* create a system wide context */
41#define PFM_FL_OVFL_NO_MSG 0x80 /* do not post overflow/end messages for notification */
42
43/*
44 * event set flags
45 */
46#define PFM_SETFL_EXCL_IDLE 0x01 /* exclude idle task (syswide only) XXX: DO NOT USE YET */
47
48/*
49 * PMC flags
50 */
51#define PFM_REGFL_OVFL_NOTIFY 0x1 /* send notification on overflow */
52#define PFM_REGFL_RANDOM 0x2 /* randomize sampling interval */
53
54/*
55 * PMD/PMC/IBR/DBR return flags (ignored on input)
56 *
57 * Those flags are used on output and must be checked in case EAGAIN is returned
58 * by any of the calls using a pfarg_reg_t or pfarg_dbreg_t structure.
59 */
60#define PFM_REG_RETFL_NOTAVAIL (1UL<<31) /* set if register is implemented but not available */
61#define PFM_REG_RETFL_EINVAL (1UL<<30) /* set if register entry is invalid */
62#define PFM_REG_RETFL_MASK (PFM_REG_RETFL_NOTAVAIL|PFM_REG_RETFL_EINVAL)
63
64#define PFM_REG_HAS_ERROR(flag) (((flag) & PFM_REG_RETFL_MASK) != 0)
65
66typedef unsigned char pfm_uuid_t[16]; /* custom sampling buffer identifier type */
67
68/*
69 * Request structure used to define a context
70 */
71typedef struct {
72 pfm_uuid_t ctx_smpl_buf_id; /* which buffer format to use (if needed) */
73 unsigned long ctx_flags; /* noblock/block */
74 unsigned short ctx_nextra_sets; /* number of extra event sets (you always get 1) */
75 unsigned short ctx_reserved1; /* for future use */
76 int ctx_fd; /* return arg: unique identification for context */
77 void *ctx_smpl_vaddr; /* return arg: virtual address of sampling buffer, is used */
78 unsigned long ctx_reserved2[11];/* for future use */
79} pfarg_context_t;
80
81/*
82 * Request structure used to write/read a PMC or PMD
83 */
84typedef struct {
85 unsigned int reg_num; /* which register */
86 unsigned short reg_set; /* event set for this register */
87 unsigned short reg_reserved1; /* for future use */
88
89 unsigned long reg_value; /* initial pmc/pmd value */
90 unsigned long reg_flags; /* input: pmc/pmd flags, return: reg error */
91
92 unsigned long reg_long_reset; /* reset after buffer overflow notification */
93 unsigned long reg_short_reset; /* reset after counter overflow */
94
95 unsigned long reg_reset_pmds[4]; /* which other counters to reset on overflow */
96 unsigned long reg_random_seed; /* seed value when randomization is used */
97 unsigned long reg_random_mask; /* bitmask used to limit random value */
98 unsigned long reg_last_reset_val;/* return: PMD last reset value */
99
100 unsigned long reg_smpl_pmds[4]; /* which pmds are accessed when PMC overflows */
101 unsigned long reg_smpl_eventid; /* opaque sampling event identifier */
102
103 unsigned long reg_reserved2[3]; /* for future use */
104} pfarg_reg_t;
105
106typedef struct {
107 unsigned int dbreg_num; /* which debug register */
108 unsigned short dbreg_set; /* event set for this register */
109 unsigned short dbreg_reserved1; /* for future use */
110 unsigned long dbreg_value; /* value for debug register */
111 unsigned long dbreg_flags; /* return: dbreg error */
112 unsigned long dbreg_reserved2[1]; /* for future use */
113} pfarg_dbreg_t;
114
115typedef struct {
116 unsigned int ft_version; /* perfmon: major [16-31], minor [0-15] */
117 unsigned int ft_reserved; /* reserved for future use */
118 unsigned long reserved[4]; /* for future use */
119} pfarg_features_t;
120
121typedef struct {
122 pid_t load_pid; /* process to load the context into */
123 unsigned short load_set; /* first event set to load */
124 unsigned short load_reserved1; /* for future use */
125 unsigned long load_reserved2[3]; /* for future use */
126} pfarg_load_t;
127
128typedef struct {
129 int msg_type; /* generic message header */
130 int msg_ctx_fd; /* generic message header */
131 unsigned long msg_ovfl_pmds[4]; /* which PMDs overflowed */
132 unsigned short msg_active_set; /* active set at the time of overflow */
133 unsigned short msg_reserved1; /* for future use */
134 unsigned int msg_reserved2; /* for future use */
135 unsigned long msg_tstamp; /* for perf tuning/debug */
136} pfm_ovfl_msg_t;
137
138typedef struct {
139 int msg_type; /* generic message header */
140 int msg_ctx_fd; /* generic message header */
141 unsigned long msg_tstamp; /* for perf tuning */
142} pfm_end_msg_t;
143
144typedef struct {
145 int msg_type; /* type of the message */
146 int msg_ctx_fd; /* unique identifier for the context */
147 unsigned long msg_tstamp; /* for perf tuning */
148} pfm_gen_msg_t;
149
150#define PFM_MSG_OVFL 1 /* an overflow happened */
151#define PFM_MSG_END 2 /* task to which context was attached ended */
152
153typedef union {
154 pfm_ovfl_msg_t pfm_ovfl_msg;
155 pfm_end_msg_t pfm_end_msg;
156 pfm_gen_msg_t pfm_gen_msg;
157} pfm_msg_t;
158
159/*
160 * Define the version numbers for both perfmon as a whole and the sampling buffer format.
161 */
162#define PFM_VERSION_MAJ 2U
163#define PFM_VERSION_MIN 0U
164#define PFM_VERSION (((PFM_VERSION_MAJ&0xffff)<<16)|(PFM_VERSION_MIN & 0xffff))
165#define PFM_VERSION_MAJOR(x) (((x)>>16) & 0xffff)
166#define PFM_VERSION_MINOR(x) ((x) & 0xffff)
167
168
169/*
170 * miscellaneous architected definitions
171 */
172#define PMU_FIRST_COUNTER 4 /* first counting monitor (PMC/PMD) */
173#define PMU_MAX_PMCS 256 /* maximum architected number of PMC registers */
174#define PMU_MAX_PMDS 256 /* maximum architected number of PMD registers */
175
176#ifdef __KERNEL__
177
178extern long perfmonctl(int fd, int cmd, void *arg, int narg);
179
180typedef struct {
181 void (*handler)(int irq, void *arg, struct pt_regs *regs);
182} pfm_intr_handler_desc_t;
183
184extern void pfm_save_regs (struct task_struct *);
185extern void pfm_load_regs (struct task_struct *);
186
187extern void pfm_exit_thread(struct task_struct *);
188extern int pfm_use_debug_registers(struct task_struct *);
189extern int pfm_release_debug_registers(struct task_struct *);
190extern void pfm_syst_wide_update_task(struct task_struct *, unsigned long info, int is_ctxswin);
191extern void pfm_inherit(struct task_struct *task, struct pt_regs *regs);
192extern void pfm_init_percpu(void);
193extern void pfm_handle_work(void);
194extern int pfm_install_alt_pmu_interrupt(pfm_intr_handler_desc_t *h);
195extern int pfm_remove_alt_pmu_interrupt(pfm_intr_handler_desc_t *h);
196
197
198
199/*
200 * Reset PMD register flags
201 */
202#define PFM_PMD_SHORT_RESET 0
203#define PFM_PMD_LONG_RESET 1
204
205typedef union {
206 unsigned int val;
207 struct {
208 unsigned int notify_user:1; /* notify user program of overflow */
209 unsigned int reset_ovfl_pmds:1; /* reset overflowed PMDs */
210 unsigned int block_task:1; /* block monitored task on kernel exit */
211 unsigned int mask_monitoring:1; /* mask monitors via PMCx.plm */
212 unsigned int reserved:28; /* for future use */
213 } bits;
214} pfm_ovfl_ctrl_t;
215
216typedef struct {
217 unsigned char ovfl_pmd; /* index of overflowed PMD */
218 unsigned char ovfl_notify; /* =1 if monitor requested overflow notification */
219 unsigned short active_set; /* event set active at the time of the overflow */
220 pfm_ovfl_ctrl_t ovfl_ctrl; /* return: perfmon controls to set by handler */
221
222 unsigned long pmd_last_reset; /* last reset value of of the PMD */
223 unsigned long smpl_pmds[4]; /* bitmask of other PMD of interest on overflow */
224 unsigned long smpl_pmds_values[PMU_MAX_PMDS]; /* values for the other PMDs of interest */
225 unsigned long pmd_value; /* current 64-bit value of the PMD */
226 unsigned long pmd_eventid; /* eventid associated with PMD */
227} pfm_ovfl_arg_t;
228
229
230typedef struct {
231 char *fmt_name;
232 pfm_uuid_t fmt_uuid;
233 size_t fmt_arg_size;
234 unsigned long fmt_flags;
235
236 int (*fmt_validate)(struct task_struct *task, unsigned int flags, int cpu, void *arg);
237 int (*fmt_getsize)(struct task_struct *task, unsigned int flags, int cpu, void *arg, unsigned long *size);
238 int (*fmt_init)(struct task_struct *task, void *buf, unsigned int flags, int cpu, void *arg);
239 int (*fmt_handler)(struct task_struct *task, void *buf, pfm_ovfl_arg_t *arg, struct pt_regs *regs, unsigned long stamp);
240 int (*fmt_restart)(struct task_struct *task, pfm_ovfl_ctrl_t *ctrl, void *buf, struct pt_regs *regs);
241 int (*fmt_restart_active)(struct task_struct *task, pfm_ovfl_ctrl_t *ctrl, void *buf, struct pt_regs *regs);
242 int (*fmt_exit)(struct task_struct *task, void *buf, struct pt_regs *regs);
243
244 struct list_head fmt_list;
245} pfm_buffer_fmt_t;
246
247extern int pfm_register_buffer_fmt(pfm_buffer_fmt_t *fmt);
248extern int pfm_unregister_buffer_fmt(pfm_uuid_t uuid);
249
250/*
251 * perfmon interface exported to modules
252 */
253extern int pfm_mod_read_pmds(struct task_struct *, void *req, unsigned int nreq, struct pt_regs *regs);
254extern int pfm_mod_write_pmcs(struct task_struct *, void *req, unsigned int nreq, struct pt_regs *regs);
255extern int pfm_mod_write_ibrs(struct task_struct *task, void *req, unsigned int nreq, struct pt_regs *regs);
256extern int pfm_mod_write_dbrs(struct task_struct *task, void *req, unsigned int nreq, struct pt_regs *regs);
257
258/*
259 * describe the content of the local_cpu_date->pfm_syst_info field
260 */
261#define PFM_CPUINFO_SYST_WIDE 0x1 /* if set a system wide session exists */
262#define PFM_CPUINFO_DCR_PP 0x2 /* if set the system wide session has started */
263#define PFM_CPUINFO_EXCL_IDLE 0x4 /* the system wide session excludes the idle task */
264
265/*
266 * sysctl control structure. visible to sampling formats
267 */
268typedef struct {
269 int debug; /* turn on/off debugging via syslog */
270 int debug_ovfl; /* turn on/off debug printk in overflow handler */
271 int fastctxsw; /* turn on/off fast (unsecure) ctxsw */
272 int expert_mode; /* turn on/off value checking */
273} pfm_sysctl_t;
274extern pfm_sysctl_t pfm_sysctl;
275
276
277#endif /* __KERNEL__ */
278
279#endif /* _ASM_IA64_PERFMON_H */