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linux/include/asm-ia64/perfmon.h
Tony Luck a1ecf7f6e6 [IA64] alternate perfmon handler 
Patch from Charles Spirakis

Some linux customers want to optimize their applications on the latest
hardware but are not yet willing to upgrade to the latest kernel. This
patch provides a way to plug in an alternate, basic, and GPL'ed PMU
subsystem to help with their monitoring needs or for specialty work. It
can also be used in case of serious unexpected bugs in perfmon. Mutual
exclusion between the two subsystems is guaranteed, hence no conflict
can arise from both subsystem being present.

Acked-by: Stephane Eranian <eranian@hpl.hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
2005-05-18 16:14:30 -07:00

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/*
* Copyright (C) 2001-2003 Hewlett-Packard Co
* Stephane Eranian <eranian@hpl.hp.com>
*/
#ifndef _ASM_IA64_PERFMON_H
#define _ASM_IA64_PERFMON_H
/*
* perfmon comamnds supported on all CPU models
*/
#define PFM_WRITE_PMCS 0x01
#define PFM_WRITE_PMDS 0x02
#define PFM_READ_PMDS 0x03
#define PFM_STOP 0x04
#define PFM_START 0x05
#define PFM_ENABLE 0x06 /* obsolete */
#define PFM_DISABLE 0x07 /* obsolete */
#define PFM_CREATE_CONTEXT 0x08
#define PFM_DESTROY_CONTEXT 0x09 /* obsolete use close() */
#define PFM_RESTART 0x0a
#define PFM_PROTECT_CONTEXT 0x0b /* obsolete */
#define PFM_GET_FEATURES 0x0c
#define PFM_DEBUG 0x0d
#define PFM_UNPROTECT_CONTEXT 0x0e /* obsolete */
#define PFM_GET_PMC_RESET_VAL 0x0f
#define PFM_LOAD_CONTEXT 0x10
#define PFM_UNLOAD_CONTEXT 0x11
/*
* PMU model specific commands (may not be supported on all PMU models)
*/
#define PFM_WRITE_IBRS 0x20
#define PFM_WRITE_DBRS 0x21
/*
* context flags
*/
#define PFM_FL_NOTIFY_BLOCK 0x01 /* block task on user level notifications */
#define PFM_FL_SYSTEM_WIDE 0x02 /* create a system wide context */
#define PFM_FL_OVFL_NO_MSG 0x80 /* do not post overflow/end messages for notification */
/*
* event set flags
*/
#define PFM_SETFL_EXCL_IDLE 0x01 /* exclude idle task (syswide only) XXX: DO NOT USE YET */
/*
* PMC flags
*/
#define PFM_REGFL_OVFL_NOTIFY 0x1 /* send notification on overflow */
#define PFM_REGFL_RANDOM 0x2 /* randomize sampling interval */
/*
* PMD/PMC/IBR/DBR return flags (ignored on input)
*
* Those flags are used on output and must be checked in case EAGAIN is returned
* by any of the calls using a pfarg_reg_t or pfarg_dbreg_t structure.
*/
#define PFM_REG_RETFL_NOTAVAIL (1UL<<31) /* set if register is implemented but not available */
#define PFM_REG_RETFL_EINVAL (1UL<<30) /* set if register entry is invalid */
#define PFM_REG_RETFL_MASK (PFM_REG_RETFL_NOTAVAIL|PFM_REG_RETFL_EINVAL)
#define PFM_REG_HAS_ERROR(flag) (((flag) & PFM_REG_RETFL_MASK) != 0)
typedef unsigned char pfm_uuid_t[16]; /* custom sampling buffer identifier type */
/*
* Request structure used to define a context
*/
typedef struct {
pfm_uuid_t ctx_smpl_buf_id; /* which buffer format to use (if needed) */
unsigned long ctx_flags; /* noblock/block */
unsigned short ctx_nextra_sets; /* number of extra event sets (you always get 1) */
unsigned short ctx_reserved1; /* for future use */
int ctx_fd; /* return arg: unique identification for context */
void *ctx_smpl_vaddr; /* return arg: virtual address of sampling buffer, is used */
unsigned long ctx_reserved2[11];/* for future use */
} pfarg_context_t;
/*
* Request structure used to write/read a PMC or PMD
*/
typedef struct {
unsigned int reg_num; /* which register */
unsigned short reg_set; /* event set for this register */
unsigned short reg_reserved1; /* for future use */
unsigned long reg_value; /* initial pmc/pmd value */
unsigned long reg_flags; /* input: pmc/pmd flags, return: reg error */
unsigned long reg_long_reset; /* reset after buffer overflow notification */
unsigned long reg_short_reset; /* reset after counter overflow */
unsigned long reg_reset_pmds[4]; /* which other counters to reset on overflow */
unsigned long reg_random_seed; /* seed value when randomization is used */
unsigned long reg_random_mask; /* bitmask used to limit random value */
unsigned long reg_last_reset_val;/* return: PMD last reset value */
unsigned long reg_smpl_pmds[4]; /* which pmds are accessed when PMC overflows */
unsigned long reg_smpl_eventid; /* opaque sampling event identifier */
unsigned long reg_reserved2[3]; /* for future use */
} pfarg_reg_t;
typedef struct {
unsigned int dbreg_num; /* which debug register */
unsigned short dbreg_set; /* event set for this register */
unsigned short dbreg_reserved1; /* for future use */
unsigned long dbreg_value; /* value for debug register */
unsigned long dbreg_flags; /* return: dbreg error */
unsigned long dbreg_reserved2[1]; /* for future use */
} pfarg_dbreg_t;
typedef struct {
unsigned int ft_version; /* perfmon: major [16-31], minor [0-15] */
unsigned int ft_reserved; /* reserved for future use */
unsigned long reserved[4]; /* for future use */
} pfarg_features_t;
typedef struct {
pid_t load_pid; /* process to load the context into */
unsigned short load_set; /* first event set to load */
unsigned short load_reserved1; /* for future use */
unsigned long load_reserved2[3]; /* for future use */
} pfarg_load_t;
typedef struct {
int msg_type; /* generic message header */
int msg_ctx_fd; /* generic message header */
unsigned long msg_ovfl_pmds[4]; /* which PMDs overflowed */
unsigned short msg_active_set; /* active set at the time of overflow */
unsigned short msg_reserved1; /* for future use */
unsigned int msg_reserved2; /* for future use */
unsigned long msg_tstamp; /* for perf tuning/debug */
} pfm_ovfl_msg_t;
typedef struct {
int msg_type; /* generic message header */
int msg_ctx_fd; /* generic message header */
unsigned long msg_tstamp; /* for perf tuning */
} pfm_end_msg_t;
typedef struct {
int msg_type; /* type of the message */
int msg_ctx_fd; /* unique identifier for the context */
unsigned long msg_tstamp; /* for perf tuning */
} pfm_gen_msg_t;
#define PFM_MSG_OVFL 1 /* an overflow happened */
#define PFM_MSG_END 2 /* task to which context was attached ended */
typedef union {
pfm_ovfl_msg_t pfm_ovfl_msg;
pfm_end_msg_t pfm_end_msg;
pfm_gen_msg_t pfm_gen_msg;
} pfm_msg_t;
/*
* Define the version numbers for both perfmon as a whole and the sampling buffer format.
*/
#define PFM_VERSION_MAJ 2U
#define PFM_VERSION_MIN 0U
#define PFM_VERSION (((PFM_VERSION_MAJ&0xffff)<<16)|(PFM_VERSION_MIN & 0xffff))
#define PFM_VERSION_MAJOR(x) (((x)>>16) & 0xffff)
#define PFM_VERSION_MINOR(x) ((x) & 0xffff)
/*
* miscellaneous architected definitions
*/
#define PMU_FIRST_COUNTER 4 /* first counting monitor (PMC/PMD) */
#define PMU_MAX_PMCS 256 /* maximum architected number of PMC registers */
#define PMU_MAX_PMDS 256 /* maximum architected number of PMD registers */
#ifdef __KERNEL__
extern long perfmonctl(int fd, int cmd, void *arg, int narg);
typedef struct {
void (*handler)(int irq, void *arg, struct pt_regs *regs);
} pfm_intr_handler_desc_t;
extern void pfm_save_regs (struct task_struct *);
extern void pfm_load_regs (struct task_struct *);
extern void pfm_exit_thread(struct task_struct *);
extern int pfm_use_debug_registers(struct task_struct *);
extern int pfm_release_debug_registers(struct task_struct *);
extern void pfm_syst_wide_update_task(struct task_struct *, unsigned long info, int is_ctxswin);
extern void pfm_inherit(struct task_struct *task, struct pt_regs *regs);
extern void pfm_init_percpu(void);
extern void pfm_handle_work(void);
extern int pfm_install_alt_pmu_interrupt(pfm_intr_handler_desc_t *h);
extern int pfm_remove_alt_pmu_interrupt(pfm_intr_handler_desc_t *h);
/*
* Reset PMD register flags
*/
#define PFM_PMD_SHORT_RESET 0
#define PFM_PMD_LONG_RESET 1
typedef union {
unsigned int val;
struct {
unsigned int notify_user:1; /* notify user program of overflow */
unsigned int reset_ovfl_pmds:1; /* reset overflowed PMDs */
unsigned int block_task:1; /* block monitored task on kernel exit */
unsigned int mask_monitoring:1; /* mask monitors via PMCx.plm */
unsigned int reserved:28; /* for future use */
} bits;
} pfm_ovfl_ctrl_t;
typedef struct {
unsigned char ovfl_pmd; /* index of overflowed PMD */
unsigned char ovfl_notify; /* =1 if monitor requested overflow notification */
unsigned short active_set; /* event set active at the time of the overflow */
pfm_ovfl_ctrl_t ovfl_ctrl; /* return: perfmon controls to set by handler */
unsigned long pmd_last_reset; /* last reset value of of the PMD */
unsigned long smpl_pmds[4]; /* bitmask of other PMD of interest on overflow */
unsigned long smpl_pmds_values[PMU_MAX_PMDS]; /* values for the other PMDs of interest */
unsigned long pmd_value; /* current 64-bit value of the PMD */
unsigned long pmd_eventid; /* eventid associated with PMD */
} pfm_ovfl_arg_t;
typedef struct {
char *fmt_name;
pfm_uuid_t fmt_uuid;
size_t fmt_arg_size;
unsigned long fmt_flags;
int (*fmt_validate)(struct task_struct *task, unsigned int flags, int cpu, void *arg);
int (*fmt_getsize)(struct task_struct *task, unsigned int flags, int cpu, void *arg, unsigned long *size);
int (*fmt_init)(struct task_struct *task, void *buf, unsigned int flags, int cpu, void *arg);
int (*fmt_handler)(struct task_struct *task, void *buf, pfm_ovfl_arg_t *arg, struct pt_regs *regs, unsigned long stamp);
int (*fmt_restart)(struct task_struct *task, pfm_ovfl_ctrl_t *ctrl, void *buf, struct pt_regs *regs);
int (*fmt_restart_active)(struct task_struct *task, pfm_ovfl_ctrl_t *ctrl, void *buf, struct pt_regs *regs);
int (*fmt_exit)(struct task_struct *task, void *buf, struct pt_regs *regs);
struct list_head fmt_list;
} pfm_buffer_fmt_t;
extern int pfm_register_buffer_fmt(pfm_buffer_fmt_t *fmt);
extern int pfm_unregister_buffer_fmt(pfm_uuid_t uuid);
/*
* perfmon interface exported to modules
*/
extern int pfm_mod_read_pmds(struct task_struct *, void *req, unsigned int nreq, struct pt_regs *regs);
extern int pfm_mod_write_pmcs(struct task_struct *, void *req, unsigned int nreq, struct pt_regs *regs);
extern int pfm_mod_write_ibrs(struct task_struct *task, void *req, unsigned int nreq, struct pt_regs *regs);
extern int pfm_mod_write_dbrs(struct task_struct *task, void *req, unsigned int nreq, struct pt_regs *regs);
/*
* describe the content of the local_cpu_date->pfm_syst_info field
*/
#define PFM_CPUINFO_SYST_WIDE 0x1 /* if set a system wide session exists */
#define PFM_CPUINFO_DCR_PP 0x2 /* if set the system wide session has started */
#define PFM_CPUINFO_EXCL_IDLE 0x4 /* the system wide session excludes the idle task */
/*
* sysctl control structure. visible to sampling formats
*/
typedef struct {
int debug; /* turn on/off debugging via syslog */
int debug_ovfl; /* turn on/off debug printk in overflow handler */
int fastctxsw; /* turn on/off fast (unsecure) ctxsw */
int expert_mode; /* turn on/off value checking */
} pfm_sysctl_t;
extern pfm_sysctl_t pfm_sysctl;
#endif /* __KERNEL__ */
#endif /* _ASM_IA64_PERFMON_H */
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