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/* $Id: perfctr.h,v 1.64 2005/05/26 00:37:36 mikpe Exp $
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* x86/x86_64 Performance-Monitoring Counters driver
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*
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* Copyright (C) 1999-2005 Mikael Pettersson
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*/
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#ifndef _ASM_I386_PERFCTR_H
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#define _ASM_I386_PERFCTR_H
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#include <asm/types.h>
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struct perfctr_sum_ctrs {
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__u64 tsc;
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__u64 pmc[18]; /* the size is not part of the user ABI */
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};
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struct perfctr_cpu_control_header {
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__u32 tsc_on;
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__u32 nractrs; /* number of accumulation-mode counters */
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__u32 nrictrs; /* number of interrupt-mode counters */
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};
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struct perfctr_cpu_state_user {
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__u32 cstatus;
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/* This is a sequence counter to ensure atomic reads by
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* userspace. The mechanism is identical to that used for
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* seqcount_t in include/linux/seqlock.h. */
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__u32 sequence;
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__u64 tsc_start;
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__u64 tsc_sum;
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struct {
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__u64 start;
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__u64 sum;
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} pmc[18]; /* the size is not part of the user ABI */
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};
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/* cstatus is a re-encoding of control.tsc_on/nractrs/nrictrs
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which should have less overhead in most cases */
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static inline
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unsigned int __perfctr_mk_cstatus(unsigned int tsc_on, unsigned int have_ictrs,
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unsigned int nrictrs, unsigned int nractrs)
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{
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return (tsc_on<<31) | (have_ictrs<<16) | ((nractrs+nrictrs)<<8) | nractrs;
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}
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static inline
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unsigned int perfctr_mk_cstatus(unsigned int tsc_on, unsigned int nractrs,
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unsigned int nrictrs)
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{
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return __perfctr_mk_cstatus(tsc_on, nrictrs, nrictrs, nractrs);
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}
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static inline unsigned int perfctr_cstatus_enabled(unsigned int cstatus)
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{
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return cstatus;
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}
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static inline int perfctr_cstatus_has_tsc(unsigned int cstatus)
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{
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return (int)cstatus < 0; /* test and jump on sign */
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}
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static inline unsigned int perfctr_cstatus_nractrs(unsigned int cstatus)
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{
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return cstatus & 0x7F; /* and with imm8 */
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}
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static inline unsigned int perfctr_cstatus_nrctrs(unsigned int cstatus)
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{
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return (cstatus >> 8) & 0x7F;
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}
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static inline unsigned int perfctr_cstatus_has_ictrs(unsigned int cstatus)
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{
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return cstatus & (0x7F << 16);
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}
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/*
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* 'struct siginfo' support for perfctr overflow signals.
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* In unbuffered mode, si_code is set to SI_PMC_OVF and a bitmask
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* describing which perfctrs overflowed is put in si_pmc_ovf_mask.
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* A bitmask is used since more than one perfctr can have overflowed
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* by the time the interrupt handler runs.
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*
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* glibc's <signal.h> doesn't seem to define __SI_FAULT or __SI_CODE(),
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* and including <asm/siginfo.h> as well may cause redefinition errors,
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* so the user and kernel values are different #defines here.
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*/
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#ifdef __KERNEL__
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#define SI_PMC_OVF (__SI_FAULT|'P')
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#else
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#define SI_PMC_OVF ('P')
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#endif
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#define si_pmc_ovf_mask _sifields._pad[0] /* XXX: use an unsigned field later */
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#ifdef __KERNEL__
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#if defined(CONFIG_PERFCTR)
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struct perfctr_cpu_control {
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struct perfctr_cpu_control_header header;
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unsigned int evntsel[18]; /* primary control registers, physical indices */
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unsigned int ireset[18]; /* >= 2^31, for i-mode counters, physical indices */
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struct {
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unsigned int escr[0x3E2-0x3A0]; /* secondary controls, physical indices */
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unsigned int pebs_enable; /* for replay tagging */
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unsigned int pebs_matrix_vert; /* for replay tagging */
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} p4;
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unsigned int pmc_map[18]; /* virtual to physical (rdpmc) index map */
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};
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struct perfctr_cpu_state {
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/* Don't change field order here without first considering the number
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of cache lines touched during sampling and context switching. */
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unsigned int id;
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int isuspend_cpu;
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struct perfctr_cpu_state_user user;
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struct perfctr_cpu_control control;
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unsigned int p4_escr_map[18];
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#ifdef CONFIG_PERFCTR_INTERRUPT_SUPPORT
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unsigned int pending_interrupt;
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#endif
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};
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/* Driver init/exit. */
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extern int perfctr_cpu_init(void);
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extern void perfctr_cpu_exit(void);
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/* CPU type name. */
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extern char *perfctr_cpu_name;
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/* Hardware reservation. */
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extern const char *perfctr_cpu_reserve(const char *service);
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extern void perfctr_cpu_release(const char *service);
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/* PRE: state has no running interrupt-mode counters.
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Check that the new control data is valid.
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Update the driver's private control data.
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is_global should be zero for per-process counters and non-zero
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for global-mode counters. This matters for HT P4s, alas.
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Returns a negative error code if the control data is invalid. */
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extern int perfctr_cpu_update_control(struct perfctr_cpu_state *state, int is_global);
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/* Parse and update control for the given domain. */
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extern int perfctr_cpu_control_write(struct perfctr_cpu_control *control,
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unsigned int domain,
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const void *srcp, unsigned int srcbytes);
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/* Retrieve and format control for the given domain.
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Returns number of bytes written. */
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extern int perfctr_cpu_control_read(const struct perfctr_cpu_control *control,
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unsigned int domain,
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void *dstp, unsigned int dstbytes);
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/* Read a-mode counters. Subtract from start and accumulate into sums.
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Must be called with preemption disabled. */
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extern void perfctr_cpu_suspend(struct perfctr_cpu_state *state);
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/* Write control registers. Read a-mode counters into start.
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Must be called with preemption disabled. */
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extern void perfctr_cpu_resume(struct perfctr_cpu_state *state);
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/* Perform an efficient combined suspend/resume operation.
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Must be called with preemption disabled. */
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extern void perfctr_cpu_sample(struct perfctr_cpu_state *state);
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/* The type of a perfctr overflow interrupt handler.
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It will be called in IRQ context, with preemption disabled. */
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typedef void (*perfctr_ihandler_t)(unsigned long pc);
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/* Operations related to overflow interrupt handling. */
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#ifdef CONFIG_X86_LOCAL_APIC
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extern void perfctr_cpu_set_ihandler(perfctr_ihandler_t);
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extern void perfctr_cpu_ireload(struct perfctr_cpu_state*);
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extern unsigned int perfctr_cpu_identify_overflow(struct perfctr_cpu_state*);
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static inline int perfctr_cpu_has_pending_interrupt(const struct perfctr_cpu_state *state)
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{
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return state->pending_interrupt;
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}
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#else
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static inline void perfctr_cpu_set_ihandler(perfctr_ihandler_t x) { }
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static inline int perfctr_cpu_has_pending_interrupt(const struct perfctr_cpu_state *state)
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{
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return 0;
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}
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#endif
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#endif /* CONFIG_PERFCTR */
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#if defined(CONFIG_PERFCTR) && defined(CONFIG_X86_LOCAL_APIC)
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asmlinkage void perfctr_interrupt(struct pt_regs*);
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#define perfctr_vector_init() \
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set_intr_gate(LOCAL_PERFCTR_VECTOR, perfctr_interrupt)
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#else
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#define perfctr_vector_init() do{}while(0)
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#endif
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#endif /* __KERNEL__ */
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#endif /* _ASM_I386_PERFCTR_H */
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