/*-
* Copyright (c) 2003-2007, Joseph Koshy
* Copyright (c) 2007 The FreeBSD Foundation
* All rights reserved.
*
* Portions of this software were developed by A. Joseph Koshy under
* sponsorship from the FreeBSD Foundation and Google, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _SYS_PMC_H_
#define _SYS_PMC_H_
#include <dev/hwpmc/pmc_events.h>
#include <machine/pmc_mdep.h>
#include <machine/profile.h>
#define PMC_MODULE_NAME "hwpmc"
#define PMC_NAME_MAX 16 /* HW counter name size */
#define PMC_CLASS_MAX 4 /* #classes of PMCs in a system */
/*
* Kernel<->userland API version number [MMmmpppp]
*
* Major numbers are to be incremented when an incompatible change to
* the ABI occurs that older clients will not be able to handle.
*
* Minor numbers are incremented when a backwards compatible change
* occurs that allows older correct programs to run unchanged. For
* example, when support for a new PMC type is added.
*
* The patch version is incremented for every bug fix.
*/
#define PMC_VERSION_MAJOR 0x03
#define PMC_VERSION_MINOR 0x00
#define PMC_VERSION_PATCH 0x0000
#define PMC_VERSION (PMC_VERSION_MAJOR << 24 | \
PMC_VERSION_MINOR << 16 | PMC_VERSION_PATCH)
/*
* Kinds of CPUs known
*/
#define __PMC_CPUS() \
__PMC_CPU(AMD_K7, "AMD K7") \
__PMC_CPU(AMD_K8, "AMD K8") \
__PMC_CPU(INTEL_P5, "Intel Pentium") \
__PMC_CPU(INTEL_P6, "Intel Pentium Pro") \
__PMC_CPU(INTEL_CL, "Intel Celeron") \
__PMC_CPU(INTEL_PII, "Intel Pentium II") \
__PMC_CPU(INTEL_PIII, "Intel Pentium III") \
__PMC_CPU(INTEL_PM, "Intel Pentium M") \
__PMC_CPU(INTEL_PIV, "Intel Pentium IV")
enum pmc_cputype {
#undef __PMC_CPU
#define __PMC_CPU(S,D) PMC_CPU_##S ,
__PMC_CPUS()
};
#define PMC_CPU_FIRST PMC_CPU_AMD_K7
#define PMC_CPU_LAST PMC_CPU_INTEL_PIV
/*
* Classes of PMCs
*/
#define __PMC_CLASSES() \
__PMC_CLASS(TSC) /* CPU Timestamp counter */ \
__PMC_CLASS(K7) /* AMD K7 performance counters */ \
__PMC_CLASS(K8) /* AMD K8 performance counters */ \
__PMC_CLASS(P5) /* Intel Pentium counters */ \
__PMC_CLASS(P6) /* Intel Pentium Pro counters */ \
__PMC_CLASS(P4) /* Intel Pentium-IV counters */
enum pmc_class {
#undef __PMC_CLASS
#define __PMC_CLASS(N) PMC_CLASS_##N ,
__PMC_CLASSES()
};
#define PMC_CLASS_FIRST PMC_CLASS_TSC
#define PMC_CLASS_LAST PMC_CLASS_P4
/*
* A PMC can be in the following states:
*
* Hardware states:
* DISABLED -- administratively prohibited from being used.
* FREE -- HW available for use
* Software states:
* ALLOCATED -- allocated
* STOPPED -- allocated, but not counting events
* RUNNING -- allocated, and in operation; 'pm_runcount'
* holds the number of CPUs using this PMC at
* a given instant
* DELETED -- being destroyed
*/
#define __PMC_HWSTATES() \
__PMC_STATE(DISABLED) \
__PMC_STATE(FREE)
#define __PMC_SWSTATES() \
__PMC_STATE(ALLOCATED) \
__PMC_STATE(STOPPED) \
__PMC_STATE(RUNNING) \
__PMC_STATE(DELETED)
#define __PMC_STATES() \
__PMC_HWSTATES() \
__PMC_SWSTATES()
enum pmc_state {
#undef __PMC_STATE
#define __PMC_STATE(S) PMC_STATE_##S,
__PMC_STATES()
__PMC_STATE(MAX)
};
#define PMC_STATE_FIRST PMC_STATE_DISABLED
#define PMC_STATE_LAST PMC_STATE_DELETED
/*
* An allocated PMC may used as a 'global' counter or as a
* 'thread-private' one. Each such mode of use can be in either
* statistical sampling mode or in counting mode. Thus a PMC in use
*
* SS i.e., SYSTEM STATISTICAL -- system-wide statistical profiling
* SC i.e., SYSTEM COUNTER -- system-wide counting mode
* TS i.e., THREAD STATISTICAL -- thread virtual, statistical profiling
* TC i.e., THREAD COUNTER -- thread virtual, counting mode
*
* Statistical profiling modes rely on the PMC periodically delivering
* a interrupt to the CPU (when the configured number of events have
* been measured), so the PMC must have the ability to generate
* interrupts.
*
* In counting modes, the PMC counts its configured events, with the
* value of the PMC being read whenever needed by its owner process.
*
* The thread specific modes "virtualize" the PMCs -- the PMCs appear
* to be thread private and count events only when the profiled thread
* actually executes on the CPU.
*
* The system-wide "global" modes keep the PMCs running all the time
* and are used to measure the behaviour of the whole system.
*/
#define __PMC_MODES() \
__PMC_MODE(SS, 0) \
__PMC_MODE(SC, 1) \
__PMC_MODE(TS, 2) \
__PMC_MODE(TC, 3)
enum pmc_mode {
#undef __PMC_MODE
#define __PMC_MODE(M,N) PMC_MODE_##M = N,
__PMC_MODES()
};
#define PMC_MODE_FIRST PMC_MODE_SS
#define PMC_MODE_LAST PMC_MODE_TC
#define PMC_IS_COUNTING_MODE(mode) \
((mode) == PMC_MODE_SC || (mode) == PMC_MODE_TC)
#define PMC_IS_SYSTEM_MODE(mode) \
((mode) == PMC_MODE_SS || (mode) == PMC_MODE_SC)
#define PMC_IS_SAMPLING_MODE(mode) \
((mode) == PMC_MODE_SS || (mode) == PMC_MODE_TS)
#define PMC_IS_VIRTUAL_MODE(mode) \
((mode) == PMC_MODE_TS || (mode) == PMC_MODE_TC)
/*
* PMC row disposition
*/
#define __PMC_DISPOSITIONS(N) \
__PMC_DISP(STANDALONE) /* global/disabled counters */ \
__PMC_DISP(FREE) /* free/available */ \
__PMC_DISP(THREAD) /* thread-virtual PMCs */ \
__PMC_DISP(UNKNOWN) /* sentinel */
enum pmc_disp {
#undef __PMC_DISP
#define __PMC_DISP(D) PMC_DISP_##D ,
__PMC_DISPOSITIONS()
};
#define PMC_DISP_FIRST PMC_DISP_STANDALONE
#define PMC_DISP_LAST PMC_DISP_THREAD
/*
* Counter capabilities
*
* __PMC_CAPS(NAME, VALUE, DESCRIPTION)
*/
#define __PMC_CAPS() \
__PMC_CAP(INTERRUPT, 0, "generate interrupts") \
__PMC_CAP(USER, 1, "count user-mode events") \
__PMC_CAP(SYSTEM, 2, "count system-mode events") \
__PMC_CAP(EDGE, 3, "do edge detection of events") \
__PMC_CAP(THRESHOLD, 4, "ignore events below a threshold") \
__PMC_CAP(READ, 5, "read PMC counter") \
__PMC_CAP(WRITE, 6, "reprogram PMC counter") \
__PMC_CAP(INVERT, 7, "invert comparision sense") \
__PMC_CAP(QUALIFIER, 8, "further qualify monitored events") \
__PMC_CAP(PRECISE, 9, "perform precise sampling") \
__PMC_CAP(TAGGING, 10, "tag upstream events") \
__PMC_CAP(CASCADE, 11, "cascade counters")
enum pmc_caps
{
#undef __PMC_CAP
#define __PMC_CAP(NAME, VALUE, DESCR) PMC_CAP_##NAME = (1 << VALUE) ,
__PMC_CAPS()
};
#define PMC_CAP_FIRST PMC_CAP_INTERRUPT
#define PMC_CAP_LAST PMC_CAP_CASCADE
/*
* PMC Event Numbers
*
* These are generated from the definitions in "dev/hwpmc/pmc_events.h".
*/
enum pmc_event {
#undef __PMC_EV
#define __PMC_EV(C,N,D) PMC_EV_ ## C ## _ ## N ,
__PMC_EVENTS()
};
#define PMC_EVENT_FIRST PMC_EV_TSC_TSC
#define PMC_EVENT_LAST PMC_EV_P5_LAST
/*
* PMC SYSCALL INTERFACE
*/
/*
* "PMC_OPS" -- these are the commands recognized by the kernel
* module, and are used when performing a system call from userland.
*/
#define __PMC_OPS() \
__PMC_OP(CONFIGURELOG, "Set log file") \
__PMC_OP(FLUSHLOG, "Flush log file") \
__PMC_OP(GETCPUINFO, "Get system CPU information") \
__PMC_OP(GETDRIVERSTATS, "Get driver statistics") \
__PMC_OP(GETMODULEVERSION, "Get module version") \
__PMC_OP(GETPMCINFO, "Get per-cpu PMC information") \
__PMC_OP(PMCADMIN, "Set PMC state") \
__PMC_OP(PMCALLOCATE, "Allocate and configure a PMC") \
__PMC_OP(PMCATTACH, "Attach a PMC to a process") \
__PMC_OP(PMCDETACH, "Detach a PMC from a process") \
__PMC_OP(PMCGETMSR, "Get a PMC's hardware address") \
__PMC_OP(PMCRELEASE, "Release a PMC") \
__PMC_OP(PMCRW, "Read/Set a PMC") \
__PMC_OP(PMCSETCOUNT, "Set initial count/sampling rate") \
__PMC_OP(PMCSTART, "Start a PMC") \
__PMC_OP(PMCSTOP, "Start a PMC") \
__PMC_OP(WRITELOG, "Write a cookie to the log file")
enum pmc_ops {
#undef __PMC_OP
#define __PMC_OP(N, D) PMC_OP_##N,
__PMC_OPS()
};
/*
* Flags used in operations on PMCs.
*/
#define PMC_F_FORCE 0x00000001 /*OP ADMIN force operation */
#define PMC_F_DESCENDANTS 0x00000002 /*OP ALLOCATE track descendants */
#define PMC_F_LOG_PROCCSW 0x00000004 /*OP ALLOCATE track ctx switches */
#define PMC_F_LOG_PROCEXIT 0x00000008 /*OP ALLOCATE log proc exits */
#define PMC_F_NEWVALUE 0x00000010 /*OP RW write new value */
#define PMC_F_OLDVALUE 0x00000020 /*OP RW get old value */
#define PMC_F_KGMON 0x00000040 /*OP ALLOCATE kgmon(8) profiling */
/* V2 API */
#define PMC_F_CALLCHAIN 0x00000080 /*OP ALLOCATE capture callchains */
/* internal flags */
#define PMC_F_ATTACHED_TO_OWNER 0x00010000 /*attached to owner*/
#define PMC_F_NEEDS_LOGFILE 0x00020000 /*needs log file */
#define PMC_F_ATTACH_DONE 0x00040000 /*attached at least once */
#define PMC_CALLCHAIN_DEPTH_MAX 32
#define PMC_CC_F_USERSPACE 0x01 /*userspace callchain*/
/*
* Cookies used to denote allocated PMCs, and the values of PMCs.
*/
typedef uint32_t pmc_id_t;
typedef uint64_t pmc_value_t;
#define PMC_ID_INVALID (~ (pmc_id_t) 0)
/*
* PMC IDs have the following format:
*
* +--------+----------+-----------+-----------+
* | CPU | PMC MODE | PMC CLASS | ROW INDEX |
* +--------+----------+-----------+-----------+
*
* where each field is 8 bits wide. Field 'CPU' is set to the
* requested CPU for system-wide PMCs or PMC_CPU_ANY for process-mode
* PMCs. Field 'PMC MODE' is the allocated PMC mode. Field 'PMC
* CLASS' is the class of the PMC. Field 'ROW INDEX' is the row index
* for the PMC.
*
* The 'ROW INDEX' ranges over 0..NWPMCS where NHWPMCS is the total
* number of hardware PMCs on this cpu.
*/
#define PMC_ID_TO_ROWINDEX(ID) ((ID) & 0xFF)
#define PMC_ID_TO_CLASS(ID) (((ID) & 0xFF00) >> 8)
#define PMC_ID_TO_MODE(ID) (((ID) & 0xFF0000) >> 16)
#define PMC_ID_TO_CPU(ID) (((ID) & 0xFF000000) >> 24)
#define PMC_ID_MAKE_ID(CPU,MODE,CLASS,ROWINDEX) \
((((CPU) & 0xFF) << 24) | (((MODE) & 0xFF) << 16) | \
(((CLASS) & 0xFF) << 8) | ((ROWINDEX) & 0xFF))
/*
* Data structures for system calls supported by the pmc driver.
*/
/*
* OP PMCALLOCATE
*
* Allocate a PMC on the named CPU.
*/
#define PMC_CPU_ANY ~0
struct pmc_op_pmcallocate {
uint32_t pm_caps; /* PMC_CAP_* */
uint32_t pm_cpu; /* CPU number or PMC_CPU_ANY */
enum pmc_class pm_class; /* class of PMC desired */
enum pmc_event pm_ev; /* [enum pmc_event] desired */
uint32_t pm_flags; /* additional modifiers PMC_F_* */
enum pmc_mode pm_mode; /* desired mode */
pmc_id_t pm_pmcid; /* [return] process pmc id */
union pmc_md_op_pmcallocate pm_md; /* MD layer extensions */
};
/*
* OP PMCADMIN
*
* Set the administrative state (i.e., whether enabled or disabled) of
* a PMC 'pm_pmc' on CPU 'pm_cpu'. Note that 'pm_pmc' specifies an
* absolute PMC number and need not have been first allocated by the
* calling process.
*/
struct pmc_op_pmcadmin {
int pm_cpu; /* CPU# */
uint32_t pm_flags; /* flags */
int pm_pmc; /* PMC# */
enum pmc_state pm_state; /* desired state */
};
/*
* OP PMCATTACH / OP PMCDETACH
*
* Attach/detach a PMC and a process.
*/
struct pmc_op_pmcattach {
pmc_id_t pm_pmc; /* PMC to attach to */
pid_t pm_pid; /* target process */
};
/*
* OP PMCSETCOUNT
*
* Set the sampling rate (i.e., the reload count) for statistical counters.
* 'pm_pmcid' need to have been previously allocated using PMCALLOCATE.
*/
struct pmc_op_pmcsetcount {
pmc_value_t pm_count; /* initial/sample count */
pmc_id_t pm_pmcid; /* PMC id to set */
};
/*
* OP PMCRW
*
* Read the value of a PMC named by 'pm_pmcid'. 'pm_pmcid' needs
* to have been previously allocated using PMCALLOCATE.
*/
struct pmc_op_pmcrw {
uint32_t pm_flags; /* PMC_F_{OLD,NEW}VALUE*/
pmc_id_t pm_pmcid; /* pmc id */
pmc_value_t pm_value; /* new&returned value */
};
/*
* OP GETPMCINFO
*
* retrieve PMC state for a named CPU. The caller is expected to
* allocate 'npmc' * 'struct pmc_info' bytes of space for the return
* values.
*/
struct pmc_info {
char pm_name[PMC_NAME_MAX]; /* pmc name */
enum pmc_class pm_class; /* enum pmc_class */
int pm_enabled; /* whether enabled */
enum pmc_disp pm_rowdisp; /* FREE, THREAD or STANDLONE */
pid_t pm_ownerpid; /* owner, or -1 */
enum pmc_mode pm_mode; /* current mode [enum pmc_mode] */
enum pmc_event pm_event; /* current event */
uint32_t pm_flags; /* current flags */
pmc_value_t pm_reloadcount; /* sampling counters only */
};
struct pmc_op_getpmcinfo {
int32_t pm_cpu; /* 0 <= cpu < mp_maxid */
struct pmc_info pm_pmcs[]; /* space for 'npmc' structures */
};
/*
* OP GETCPUINFO
*
* Retrieve system CPU information.
*/
struct pmc_classinfo {
enum pmc_class pm_class; /* class id */
uint32_t pm_caps; /* counter capabilities */
uint32_t pm_width; /* width of the PMC */
};
struct pmc_op_getcpuinfo {
enum pmc_cputype pm_cputype; /* what kind of CPU */
uint32_t pm_ncpu; /* number of CPUs */
uint32_t pm_npmc; /* #PMCs per CPU */
uint32_t pm_nclass; /* #classes of PMCs */
struct pmc_classinfo pm_classes[PMC_CLASS_MAX];
};
/*
* OP CONFIGURELOG
*
* Configure a log file for writing system-wide statistics to.
*/
struct pmc_op_configurelog {
int pm_flags;
int pm_logfd; /* logfile fd (or -1) */
};
/*
* OP GETDRIVERSTATS
*
* Retrieve pmc(4) driver-wide statistics.
*/
struct pmc_op_getdriverstats {
int pm_intr_ignored; /* #interrupts ignored */
int pm_intr_processed; /* #interrupts processed */
int pm_intr_bufferfull; /* #interrupts with ENOSPC */
int pm_syscalls; /* #syscalls */
int pm_syscall_errors; /* #syscalls with errors */
int pm_buffer_requests; /* #buffer requests */
int pm_buffer_requests_failed; /* #failed buffer requests */
int pm_log_sweeps; /* #sample buffer processing passes */
};
/*
* OP RELEASE / OP START / OP STOP
*
* Simple operations on a PMC id.
*/
struct pmc_op_simple {
pmc_id_t pm_pmcid;
};
/*
* OP WRITELOG
*
* Flush the current log buffer and write 4 bytes of user data to it.
*/
struct pmc_op_writelog {
uint32_t pm_userdata;
};
/*
* OP GETMSR
*
* Retrieve the machine specific address assoicated with the allocated
* PMC. This number can be used subsequently with a read-performance-counter
* instruction.
*/
struct pmc_op_getmsr {
uint32_t pm_msr; /* machine specific address */
pmc_id_t pm_pmcid; /* allocated pmc id */
};
#ifdef _KERNEL
#include <sys/malloc.h>
#include <sys/sysctl.h>
#include <machine/frame.h>
#define PMC_HASH_SIZE 16
#define PMC_MTXPOOL_SIZE 32
#define PMC_LOG_BUFFER_SIZE 4
#define PMC_NLOGBUFFERS 16
#define PMC_NSAMPLES 32
#define PMC_CALLCHAIN_DEPTH 8
#define PMC_SYSCTL_NAME_PREFIX "kern." PMC_MODULE_NAME "."
/*
* Locking keys
*
* (b) - pmc_bufferlist_mtx (spin lock)
* (k) - pmc_kthread_mtx (sleep lock)
* (o) - po->po_mtx (spin lock)
*/
/*
* PMC commands
*/
struct pmc_syscall_args {
uint32_t pmop_code; /* one of PMC_OP_* */
void *pmop_data; /* syscall parameter */
};
/*
* Interface to processor specific s1tuff
*/
/*
* struct pmc_descr
*
* Machine independent (i.e., the common parts) of a human readable
* PMC description.
*/
struct pmc_descr {
char pd_name[PMC_NAME_MAX]; /* name */
uint32_t pd_caps; /* capabilities */
enum pmc_class pd_class; /* class of the PMC */
uint32_t pd_width; /* width in bits */
};
/*
* struct pmc_target
*
* This structure records all the target processes associated with a
* PMC.
*/
struct pmc_target {
LIST_ENTRY(pmc_target) pt_next;
struct pmc_process *pt_process; /* target descriptor */
};
/*
* struct pmc
*
* Describes each allocated PMC.
*
* Each PMC has precisely one owner, namely the process that allocated
* the PMC.
*
* A PMC may be attached to multiple target processes. The
* 'pm_targets' field links all the target processes being monitored
* by this PMC.
*
* The 'pm_savedvalue' field is protected by a mutex.
*
* On a multi-cpu machine, multiple target threads associated with a
* process-virtual PMC could be concurrently executing on different
* CPUs. The 'pm_runcount' field is atomically incremented every time
* the PMC gets scheduled on a CPU and atomically decremented when it
* get descheduled. Deletion of a PMC is only permitted when this
* field is '0'.
*
*/
struct pmc {
LIST_HEAD(,pmc_target) pm_targets; /* list of target processes */
LIST_ENTRY(pmc) pm_next; /* owner's list */
/*
* System-wide PMCs are allocated on a CPU and are not moved
* around. For system-wide PMCs we record the CPU the PMC was
* allocated on in the 'CPU' field of the pmc ID.
*
* Virtual PMCs run on whichever CPU is currently executing
* their targets' threads. For these PMCs we need to save
* their current PMC counter values when they are taken off
* CPU.
*/
union {
pmc_value_t pm_savedvalue; /* Virtual PMCS */
} pm_gv;
/*
* For sampling mode PMCs, we keep track of the PMC's "reload
* count", which is the counter value to be loaded in when
* arming the PMC for the next counting session. For counting
* modes on PMCs that are read-only (e.g., the x86 TSC), we
* keep track of the initial value at the start of
* counting-mode operation.
*/
union {
pmc_value_t pm_reloadcount; /* sampling PMC modes */
pmc_value_t pm_initial; /* counting PMC modes */
} pm_sc;
uint32_t pm_stalled; /* marks stalled sampling PMCs */
uint32_t pm_caps; /* PMC capabilities */
enum pmc_event pm_event; /* event being measured */
uint32_t pm_flags; /* additional flags PMC_F_... */
struct pmc_owner *pm_owner; /* owner thread state */
uint32_t pm_runcount; /* #cpus currently on */
enum pmc_state pm_state; /* current PMC state */
/*
* The PMC ID field encodes the row-index for the PMC, its
* mode, class and the CPU# associated with the PMC.
*/
pmc_id_t pm_id; /* allocated PMC id */
/* md extensions */
union pmc_md_pmc pm_md;
};
/*
* Accessor macros for 'struct pmc'
*/
#define PMC_TO_MODE(P) PMC_ID_TO_MODE((P)->pm_id)
#define PMC_TO_CLASS(P) PMC_ID_TO_CLASS((P)->pm_id)
#define PMC_TO_ROWINDEX(P) PMC_ID_TO_ROWINDEX((P)->pm_id)
#define PMC_TO_CPU(P) PMC_ID_TO_CPU((P)->pm_id)
/*
* struct pmc_process
*
* Record a 'target' process being profiled.
*
* The target process being profiled could be different from the owner
* process which allocated the PMCs. Each target process descriptor
* is associated with NHWPMC 'struct pmc *' pointers. Each PMC at a
* given hardware row-index 'n' will use slot 'n' of the 'pp_pmcs[]'
* array. The size of this structure is thus PMC architecture
* dependent.
*
* TODO: Only process-private counting mode PMCs may be attached to a
* process different from the allocator process (since we do not have
* the infrastructure to make sense of an interrupted PC value from a
* 'target' process (yet)).
*
*/
struct pmc_targetstate {
struct pmc *pp_pmc; /* target PMC */
pmc_value_t pp_pmcval; /* per-process value */
};
struct pmc_process {
LIST_ENTRY(pmc_process) pp_next; /* hash chain */
int pp_refcnt; /* reference count */
uint32_t pp_flags; /* flags PMC_PP_* */
struct proc *pp_proc; /* target thread */
struct pmc_targetstate pp_pmcs[]; /* NHWPMCs */
};
#define PMC_PP_ENABLE_MSR_ACCESS 0x00000001
/*
* struct pmc_owner
*
* We associate a PMC with an 'owner' process.
*
* A process can be associated with 0..NCPUS*NHWPMC PMCs during its
* lifetime, where NCPUS is the numbers of CPUS in the system and
* NHWPMC is the number of hardware PMCs per CPU. These are
* maintained in the list headed by the 'po_pmcs' to save on space.
*
*/
struct pmc_owner {
LIST_ENTRY(pmc_owner) po_next; /* hash chain */
LIST_ENTRY(pmc_owner) po_ssnext; /* list of SS PMC owners */
LIST_HEAD(, pmc) po_pmcs; /* owned PMC list */
TAILQ_HEAD(, pmclog_buffer) po_logbuffers; /* (o) logbuffer list */
struct mtx po_mtx; /* spin lock for (o) */
struct proc *po_owner; /* owner proc */
uint32_t po_flags; /* (k) flags PMC_PO_* */
struct proc *po_kthread; /* (k) helper kthread */
struct pmclog_buffer *po_curbuf; /* current log buffer */
struct file *po_file; /* file reference */
int po_error; /* recorded error */
int po_sscount; /* # SS PMCs owned */
};
#define PMC_PO_OWNS_LOGFILE 0x00000001 /* has a log file */
#define PMC_PO_IN_FLUSH 0x00000010 /* in the middle of a flush */
#define PMC_PO_INITIAL_MAPPINGS_DONE 0x00000020
/*
* struct pmc_hw -- describe the state of the PMC hardware
*
* When in use, a HW PMC is associated with one allocated 'struct pmc'
* pointed to by field 'phw_pmc'. When inactive, this field is NULL.
*
* On an SMP box, one or more HW PMC's in process virtual mode with
* the same 'phw_pmc' could be executing on different CPUs. In order
* to handle this case correctly, we need to ensure that only
* incremental counts get added to the saved value in the associated
* 'struct pmc'. The 'phw_save' field is used to keep the saved PMC
* value at the time the hardware is started during this context
* switch (i.e., the difference between the new (hardware) count and
* the saved count is atomically added to the count field in 'struct
* pmc' at context switch time).
*
*/
struct pmc_hw {
uint32_t phw_state; /* see PHW_* macros below */
struct pmc *phw_pmc; /* current thread PMC */
};
#define PMC_PHW_RI_MASK 0x000000FF
#define PMC_PHW_CPU_SHIFT 8
#define PMC_PHW_CPU_MASK 0x0000FF00
#define PMC_PHW_FLAGS_SHIFT 16
#define PMC_PHW_FLAGS_MASK 0xFFFF0000
#define PMC_PHW_INDEX_TO_STATE(ri) ((ri) & PMC_PHW_RI_MASK)
#define PMC_PHW_STATE_TO_INDEX(state) ((state) & PMC_PHW_RI_MASK)
#define PMC_PHW_CPU_TO_STATE(cpu) (((cpu) << PMC_PHW_CPU_SHIFT) & \
PMC_PHW_CPU_MASK)
#define PMC_PHW_STATE_TO_CPU(state) (((state) & PMC_PHW_CPU_MASK) >> \
PMC_PHW_CPU_SHIFT)
#define PMC_PHW_FLAGS_TO_STATE(flags) (((flags) << PMC_PHW_FLAGS_SHIFT) & \
PMC_PHW_FLAGS_MASK)
#define PMC_PHW_STATE_TO_FLAGS(state) (((state) & PMC_PHW_FLAGS_MASK) >> \
PMC_PHW_FLAGS_SHIFT)
#define PMC_PHW_FLAG_IS_ENABLED (PMC_PHW_FLAGS_TO_STATE(0x01))
#define PMC_PHW_FLAG_IS_SHAREABLE (PMC_PHW_FLAGS_TO_STATE(0x02))
/*
* struct pmc_sample
*
* Space for N (tunable) PC samples and associated control data.
*/
struct pmc_sample {
uint16_t ps_nsamples; /* callchain depth */
uint8_t ps_cpu; /* cpu number */
uint8_t ps_flags; /* other flags */
pid_t ps_pid; /* process PID or -1 */
struct pmc *ps_pmc; /* interrupting PMC */
uintptr_t *ps_pc; /* (const) callchain start */
};
#define PMC_SAMPLE_FREE ((uint16_t) 0)
#define PMC_SAMPLE_INUSE ((uint16_t) 0xFFFF)
struct pmc_samplebuffer {
struct pmc_sample * volatile ps_read; /* read pointer */
struct pmc_sample * volatile ps_write; /* write pointer */
uintptr_t *ps_callchains; /* all saved call chains */
struct pmc_sample *ps_fence; /* one beyond ps_samples[] */
struct pmc_sample ps_samples[]; /* array of sample entries */
};
/*
* struct pmc_cpustate
*
* A CPU is modelled as a collection of HW PMCs with space for additional
* flags.
*/
struct pmc_cpu {
uint32_t pc_state; /* physical cpu number + flags */
struct pmc_samplebuffer *pc_sb; /* space for samples */
struct pmc_hw *pc_hwpmcs[]; /* 'npmc' pointers */
/* other machine dependent fields come here */
};
#define PMC_PCPU_CPU_MASK 0x000000FF
#define PMC_PCPU_FLAGS_MASK 0xFFFFFF00
#define PMC_PCPU_FLAGS_SHIFT 8
#define PMC_PCPU_STATE_TO_CPU(S) ((S) & PMC_PCPU_CPU_MASK)
#define PMC_PCPU_STATE_TO_FLAGS(S) (((S) & PMC_PCPU_FLAGS_MASK) >> PMC_PCPU_FLAGS_SHIFT)
#define PMC_PCPU_FLAGS_TO_STATE(F) (((F) << PMC_PCPU_FLAGS_SHIFT) & PMC_PCPU_FLAGS_MASK)
#define PMC_PCPU_CPU_TO_STATE(C) ((C) & PMC_PCPU_CPU_MASK)
#define PMC_PCPU_FLAG_HTT (PMC_PCPU_FLAGS_TO_STATE(0x1))
/*
* struct pmc_binding
*
* CPU binding information.
*/
struct pmc_binding {
int pb_bound; /* is bound? */
int pb_cpu; /* if so, to which CPU */
};
/*
* struct pmc_mdep
*
* Machine dependent bits needed per CPU type.
*/
struct pmc_mdep {
uint32_t pmd_cputype; /* from enum pmc_cputype */
uint32_t pmd_npmc; /* max PMCs per CPU */
uint32_t pmd_nclass; /* # PMC classes supported */
struct pmc_classinfo pmd_classes[PMC_CLASS_MAX];
int pmd_nclasspmcs[PMC_CLASS_MAX];
/*
* Methods
*/
int (*pmd_init)(int _cpu); /* machine dependent initialization */
int (*pmd_cleanup)(int _cpu); /* machine dependent cleanup */
/* thread context switch in/out */
int (*pmd_switch_in)(struct pmc_cpu *_p, struct pmc_process *_pp);
int (*pmd_switch_out)(struct pmc_cpu *_p, struct pmc_process *_pp);
/* configuring/reading/writing the hardware PMCs */
int (*pmd_config_pmc)(int _cpu, int _ri, struct pmc *_pm);
int (*pmd_get_config)(int _cpu, int _ri, struct pmc **_ppm);
int (*pmd_read_pmc)(int _cpu, int _ri, pmc_value_t *_value);
int (*pmd_write_pmc)(int _cpu, int _ri, pmc_value_t _value);
/* pmc allocation/release */
int (*pmd_allocate_pmc)(int _cpu, int _ri, struct pmc *_t,
const struct pmc_op_pmcallocate *_a);
int (*pmd_release_pmc)(int _cpu, int _ri, struct pmc *_pm);
/* starting and stopping PMCs */
int (*pmd_start_pmc)(int _cpu, int _ri);
int (*pmd_stop_pmc)(int _cpu, int _ri);
/* handle a PMC interrupt */
int (*pmd_intr)(int _cpu, struct trapframe *_tf);
int (*pmd_describe)(int _cpu, int _ri, struct pmc_info *_pi,
struct pmc **_ppmc);
int (*pmd_get_msr)(int _ri, uint32_t *_msr);
};
/*
* Per-CPU state. This is an array of 'mp_ncpu' pointers
* to struct pmc_cpu descriptors.
*/
extern struct pmc_cpu **pmc_pcpu;
extern struct pmc_mdep *md;
/* driver statistics */
extern struct pmc_op_getdriverstats pmc_stats;
#if defined(DEBUG) && DEBUG
/* debug flags, major flag groups */
struct pmc_debugflags {
int pdb_CPU;
int pdb_CSW;
int pdb_LOG;
int pdb_MDP;
int pdb_MOD;
int pdb_OWN;
int pdb_PMC;
int pdb_PRC;
int pdb_SAM;
};
extern struct pmc_debugflags pmc_debugflags;
#define PMC_DEBUG_STRSIZE 128
#define PMC_DEBUG_DEFAULT_FLAGS { 0, 0, 0, 0, 0, 0, 0, 0 }
#define PMCDBG(M,N,L,F,...) do { \
if (pmc_debugflags.pdb_ ## M & (1 << PMC_DEBUG_MIN_ ## N)) \
printf(#M ":" #N ":" #L ": " F "\n", __VA_ARGS__); \
} while (0)
/* Major numbers */
#define PMC_DEBUG_MAJ_CPU 0 /* cpu switches */
#define PMC_DEBUG_MAJ_CSW 1 /* context switches */
#define PMC_DEBUG_MAJ_LOG 2 /* logging */
#define PMC_DEBUG_MAJ_MDP 3 /* machine dependent */
#define PMC_DEBUG_MAJ_MOD 4 /* misc module infrastructure */
#define PMC_DEBUG_MAJ_OWN 5 /* owner */
#define PMC_DEBUG_MAJ_PMC 6 /* pmc management */
#define PMC_DEBUG_MAJ_PRC 7 /* processes */
#define PMC_DEBUG_MAJ_SAM 8 /* sampling */
/* Minor numbers */
/* Common (8 bits) */
#define PMC_DEBUG_MIN_ALL 0 /* allocation */
#define PMC_DEBUG_MIN_REL 1 /* release */
#define PMC_DEBUG_MIN_OPS 2 /* ops: start, stop, ... */
#define PMC_DEBUG_MIN_INI 3 /* init */
#define PMC_DEBUG_MIN_FND 4 /* find */
/* MODULE */
#define PMC_DEBUG_MIN_PMH 14 /* pmc_hook */
#define PMC_DEBUG_MIN_PMS 15 /* pmc_syscall */
/* OWN */
#define PMC_DEBUG_MIN_ORM 8 /* owner remove */
#define PMC_DEBUG_MIN_OMR 9 /* owner maybe remove */
/* PROCESSES */
#define PMC_DEBUG_MIN_TLK 8 /* link target */
#define PMC_DEBUG_MIN_TUL 9 /* unlink target */
#define PMC_DEBUG_MIN_EXT 10 /* process exit */
#define PMC_DEBUG_MIN_EXC 11 /* process exec */
#define PMC_DEBUG_MIN_FRK 12 /* process fork */
#define PMC_DEBUG_MIN_ATT 13 /* attach/detach */
#define PMC_DEBUG_MIN_SIG 14 /* signalling */
/* CONTEXT SWITCHES */
#define PMC_DEBUG_MIN_SWI 8 /* switch in */
#define PMC_DEBUG_MIN_SWO 9 /* switch out */
/* PMC */
#define PMC_DEBUG_MIN_REG 8 /* pmc register */
#define PMC_DEBUG_MIN_ALR 9 /* allocate row */
/* MACHINE DEPENDENT LAYER */
#define PMC_DEBUG_MIN_REA 8 /* read */
#define PMC_DEBUG_MIN_WRI 9 /* write */
#define PMC_DEBUG_MIN_CFG 10 /* config */
#define PMC_DEBUG_MIN_STA 11 /* start */
#define PMC_DEBUG_MIN_STO 12 /* stop */
#define PMC_DEBUG_MIN_INT 13 /* interrupts */
/* CPU */
#define PMC_DEBUG_MIN_BND 8 /* bind */
#define PMC_DEBUG_MIN_SEL 9 /* select */
/* LOG */
#define PMC_DEBUG_MIN_GTB 8 /* get buf */
#define PMC_DEBUG_MIN_SIO 9 /* schedule i/o */
#define PMC_DEBUG_MIN_FLS 10 /* flush */
#define PMC_DEBUG_MIN_SAM 11 /* sample */
#else
#define PMCDBG(M,N,L,F,...) /* nothing */
#endif
/* declare a dedicated memory pool */
MALLOC_DECLARE(M_PMC);
/*
* Functions
*/
struct pmc_mdep *pmc_md_initialize(void); /* MD init function */
int pmc_getrowdisp(int _ri);
int pmc_process_interrupt(int _cpu, struct pmc *_pm,
struct trapframe *_tf, int _inuserspace);
int pmc_save_kernel_callchain(uintptr_t *_cc, int _maxsamples,
struct trapframe *_tf);
int pmc_save_user_callchain(uintptr_t *_cc, int _maxsamples,
struct trapframe *_tf);
#endif /* _KERNEL */
#endif /* _SYS_PMC_H_ */
