Delete stale files post their move to "sys/dev/hwpmc/".

1 files changed, 0 insertions, 3670 deletions

diff --git a/sys/hwpmc/hwpmc_mod.c b/sys/hwpmc/hwpmc_mod.c
deleted file mode 100644
index 3f5cbd7..0000000
--- a/sys/hwpmc/hwpmc_mod.c
+++ /dev/null
@@ -1,3670 +0,0 @@
-/*-
- * Copyright (c) 2003-2005 Joseph Koshy
- * All rights reserved.
- *
- * 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.
- *
- */
-
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD$");
-
-#include <sys/param.h>
-#include <sys/eventhandler.h>
-#include <sys/jail.h>
-#include <sys/kernel.h>
-#include <sys/limits.h>
-#include <sys/lock.h>
-#include <sys/malloc.h>
-#include <sys/module.h>
-#include <sys/mutex.h>
-#include <sys/pmc.h>
-#include <sys/pmckern.h>
-#include <sys/proc.h>
-#include <sys/queue.h>
-#include <sys/sched.h>
-#include <sys/signalvar.h>
-#include <sys/smp.h>
-#include <sys/sx.h>
-#include <sys/sysctl.h>
-#include <sys/sysent.h>
-#include <sys/systm.h>
-
-#include <machine/md_var.h>
-
-/*
- * Types
- */
-
-enum pmc_flags {
-	PMC_FLAG_NONE	  = 0x00, /* do nothing */
-	PMC_FLAG_REMOVE   = 0x01, /* atomically remove entry from hash */
-	PMC_FLAG_ALLOCATE = 0x02, /* add entry to hash if not found */
-};
-
-/*
- * The offset in sysent where the syscall is allocated.
- */
-
-static int pmc_syscall_num = NO_SYSCALL;
-struct pmc_cpu		**pmc_pcpu;	 /* per-cpu state */
-pmc_value_t		*pmc_pcpu_saved; /* saved PMC values: CSW handling */
-
-#define	PMC_PCPU_SAVED(C,R)	pmc_pcpu_saved[(R) + md->pmd_npmc*(C)]
-
-struct mtx_pool		*pmc_mtxpool;
-static int		*pmc_pmcdisp;	 /* PMC row dispositions */
-
-#define	PMC_ROW_DISP_IS_FREE(R)		(pmc_pmcdisp[(R)] == 0)
-#define	PMC_ROW_DISP_IS_THREAD(R)	(pmc_pmcdisp[(R)] > 0)
-#define	PMC_ROW_DISP_IS_STANDALONE(R)	(pmc_pmcdisp[(R)] < 0)
-
-#define	PMC_MARK_ROW_FREE(R) do {					  \
-	pmc_pmcdisp[(R)] = 0;						  \
-} while (0)
-
-#define	PMC_MARK_ROW_STANDALONE(R) do {					  \
-	KASSERT(pmc_pmcdisp[(R)] <= 0, ("[pmc,%d] row disposition error", \
-		    __LINE__));						  \
-	atomic_add_int(&pmc_pmcdisp[(R)], -1);				  \
-	KASSERT(pmc_pmcdisp[(R)] >= (-mp_ncpus), ("[pmc,%d] row "	  \
-		"disposition error", __LINE__));			  \
-} while (0)
-
-#define	PMC_UNMARK_ROW_STANDALONE(R) do { 				  \
-	atomic_add_int(&pmc_pmcdisp[(R)], 1);				  \
-	KASSERT(pmc_pmcdisp[(R)] <= 0, ("[pmc,%d] row disposition error", \
-		    __LINE__));						  \
-} while (0)
-
-#define	PMC_MARK_ROW_THREAD(R) do {					  \
-	KASSERT(pmc_pmcdisp[(R)] >= 0, ("[pmc,%d] row disposition error", \
-		    __LINE__));						  \
-	atomic_add_int(&pmc_pmcdisp[(R)], 1);				  \
-} while (0)
-
-#define	PMC_UNMARK_ROW_THREAD(R) do {					  \
-	atomic_add_int(&pmc_pmcdisp[(R)], -1);				  \
-	KASSERT(pmc_pmcdisp[(R)] >= 0, ("[pmc,%d] row disposition error", \
-		    __LINE__));						  \
-} while (0)
-
-
-/* various event handlers */
-static eventhandler_tag	pmc_exit_tag, pmc_fork_tag;
-
-/* Module statistics */
-struct pmc_op_getdriverstats pmc_stats;
-
-/* Machine/processor dependent operations */
-struct pmc_mdep  *md;
-
-/*
- * Hash tables mapping owner processes and target threads to PMCs.
- */
-
-struct mtx pmc_processhash_mtx;		/* spin mutex */
-static u_long pmc_processhashmask;
-static LIST_HEAD(pmc_processhash, pmc_process)	*pmc_processhash;
-
-/*
- * Hash table of PMC owner descriptors.  This table is protected by
- * the shared PMC "sx" lock.
- */
-
-static u_long pmc_ownerhashmask;
-static LIST_HEAD(pmc_ownerhash, pmc_owner)	*pmc_ownerhash;
-
-/*
- * Prototypes
- */
-
-#if	DEBUG
-static int	pmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS);
-static int	pmc_debugflags_parse(char *newstr, char *fence);
-#endif
-
-static int	load(struct module *module, int cmd, void *arg);
-static int	pmc_syscall_handler(struct thread *td, void *syscall_args);
-static int	pmc_configure_log(struct pmc_owner *po, int logfd);
-static void	pmc_log_process_exit(struct pmc *pm, struct pmc_process *pp);
-static struct pmc *pmc_allocate_pmc_descriptor(void);
-static struct pmc *pmc_find_pmc_descriptor_in_process(struct pmc_owner *po,
-    pmc_id_t pmc);
-static void	pmc_release_pmc_descriptor(struct pmc *pmc);
-static int	pmc_can_allocate_rowindex(struct proc *p, unsigned int ri);
-static struct pmc_process *pmc_find_process_descriptor(struct proc *p,
-    uint32_t mode);
-static void	pmc_remove_process_descriptor(struct pmc_process *pp);
-static struct pmc_owner *pmc_find_owner_descriptor(struct proc *p);
-static int	pmc_find_pmc(pmc_id_t pmcid, struct pmc **pm);
-static void	pmc_remove_owner(struct pmc_owner *po);
-static void	pmc_maybe_remove_owner(struct pmc_owner *po);
-static void	pmc_unlink_target_process(struct pmc *pmc,
-    struct pmc_process *pp);
-static void	pmc_link_target_process(struct pmc *pm,
-    struct pmc_process *pp);
-static void	pmc_unlink_owner(struct pmc *pmc);
-static void	pmc_cleanup(void);
-static void	pmc_save_cpu_binding(struct pmc_binding *pb);
-static void	pmc_restore_cpu_binding(struct pmc_binding *pb);
-static void	pmc_select_cpu(int cpu);
-static void	pmc_process_exit(void *arg, struct proc *p);
-static void	pmc_process_fork(void *arg, struct proc *p1,
-    struct proc *p2, int n);
-static int	pmc_attach_one_process(struct proc *p, struct pmc *pm);
-static int	pmc_attach_process(struct proc *p, struct pmc *pm);
-static int	pmc_detach_one_process(struct proc *p, struct pmc *pm,
-    int flags);
-static int	pmc_detach_process(struct proc *p, struct pmc *pm);
-static int	pmc_start(struct pmc *pm);
-static int	pmc_stop(struct pmc *pm);
-static int	pmc_can_attach(struct pmc *pm, struct proc *p);
-
-/*
- * Kernel tunables and sysctl(8) interface.
- */
-
-#define PMC_SYSCTL_NAME_PREFIX "kern." PMC_MODULE_NAME "."
-
-SYSCTL_NODE(_kern, OID_AUTO, hwpmc, CTLFLAG_RW, 0, "HWPMC parameters");
-
-#if	DEBUG
-unsigned int pmc_debugflags = PMC_DEBUG_DEFAULT_FLAGS;
-char	pmc_debugstr[PMC_DEBUG_STRSIZE];
-TUNABLE_STR(PMC_SYSCTL_NAME_PREFIX "debugflags", pmc_debugstr,
-    sizeof(pmc_debugstr));
-SYSCTL_PROC(_kern_hwpmc, OID_AUTO, debugflags,
-    CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_TUN,
-    0, 0, pmc_debugflags_sysctl_handler, "A", "debug flags");
-#endif
-
-/*
- * kern.pmc.hashrows -- determines the number of rows in the
- * of the hash table used to look up threads
- */
-
-static int pmc_hashsize = PMC_HASH_SIZE;
-TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "hashsize", &pmc_hashsize);
-SYSCTL_INT(_kern_hwpmc, OID_AUTO, hashsize, CTLFLAG_TUN|CTLFLAG_RD,
-    &pmc_hashsize, 0, "rows in hash tables");
-
-/*
- * kern.pmc.pcpusize -- the size of each per-cpu
- * area for collection PC samples.
- */
-
-static int pmc_pcpu_buffer_size = PMC_PCPU_BUFFER_SIZE;
-TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "pcpubuffersize", &pmc_pcpu_buffer_size);
-SYSCTL_INT(_kern_hwpmc, OID_AUTO, pcpubuffersize, CTLFLAG_TUN|CTLFLAG_RD,
-    &pmc_pcpu_buffer_size, 0, "size of per-cpu buffer in 4K pages");
-
-/*
- * kern.pmc.mtxpoolsize -- number of mutexes in the mutex pool.
- */
-
-static int pmc_mtxpool_size = PMC_MTXPOOL_SIZE;
-TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "mtxpoolsize", &pmc_mtxpool_size);
-SYSCTL_INT(_kern_hwpmc, OID_AUTO, mtxpoolsize, CTLFLAG_TUN|CTLFLAG_RD,
-    &pmc_mtxpool_size, 0, "size of spin mutex pool");
-
-
-
-/*
- * security.bsd.unprivileged_syspmcs -- allow non-root processes to
- * allocate system-wide PMCs.
- *
- * Allowing unprivileged processes to allocate system PMCs is convenient
- * if system-wide measurements need to be taken concurrently with other
- * per-process measurements.  This feature is turned off by default.
- */
-
-SYSCTL_DECL(_security_bsd);
-
-static int pmc_unprivileged_syspmcs = 0;
-TUNABLE_INT("security.bsd.unprivileged_syspmcs", &pmc_unprivileged_syspmcs);
-SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_syspmcs, CTLFLAG_RW,
-    &pmc_unprivileged_syspmcs, 0,
-    "allow unprivileged process to allocate system PMCs");
-
-#if	PMC_HASH_USE_CRC32
-
-#define	PMC_HASH_PTR(P,M)	(crc32(&(P), sizeof((P))) & (M))
-
-#else 	/* integer multiplication */
-
-#if	LONG_BIT == 64
-#define	_PMC_HM		11400714819323198486u
-#elif	LONG_BIT == 32
-#define	_PMC_HM		2654435769u
-#else
-#error 	Must know the size of 'long' to compile
-#endif
-
-/*
- * Hash function.  Discard the lower 2 bits of the pointer since
- * these are always zero for our uses.  The hash multiplier is
- * round((2^LONG_BIT) * ((sqrt(5)-1)/2)).
- */
-
-#define	PMC_HASH_PTR(P,M)	((((unsigned long) (P) >> 2) * _PMC_HM) & (M))
-
-#endif
-
-/*
- * Syscall structures
- */
-
-/* The `sysent' for the new syscall */
-static struct sysent pmc_sysent = {
-	2,			/* sy_narg */
-	pmc_syscall_handler	/* sy_call */
-};
-
-static struct syscall_module_data pmc_syscall_mod = {
-	load,
-	NULL,
-	&pmc_syscall_num,
-	&pmc_sysent,
-	{ 0, NULL }
-};
-
-static moduledata_t pmc_mod = {
-	PMC_MODULE_NAME,
-	syscall_module_handler,
-	&pmc_syscall_mod
-};
-
-DECLARE_MODULE(pmc, pmc_mod, SI_SUB_SMP, SI_ORDER_ANY);
-MODULE_VERSION(pmc, PMC_VERSION);
-
-#if	DEBUG
-static int
-pmc_debugflags_parse(char *newstr, char *fence)
-{
-	char c, *p, *q;
-	unsigned int tmpflags;
-	int level;
-	char tmpbuf[4];		/* 3 character keyword + '\0' */
-
-	tmpflags = 0;
-	level = 0xF;	/* max verbosity */
-
-	p = newstr;
-
-	for (; p < fence && (c = *p);) {
-
-		/* skip separators */
-		if (c == ' ' || c == '\t' || c == ',') {
-			p++; continue;
-		}
-
-		(void) strlcpy(tmpbuf, p, sizeof(tmpbuf));
-
-#define	CMP_SET_FLAG_MAJ(S,F)					\
-		else if (strncmp(tmpbuf, S, 3) == 0)		\
-			tmpflags |= __PMCDFMAJ(F)
-
-#define	CMP_SET_FLAG_MIN(S,F)					\
-		else if (strncmp(tmpbuf, S, 3) == 0)		\
-			tmpflags |= __PMCDFMIN(F)
-
-		if (fence - p > 6 && strncmp(p, "level=", 6) == 0) {
-			p += 6;	/* skip over keyword */
-			level = strtoul(p, &q, 16);
-		}
-		CMP_SET_FLAG_MAJ("mod", MOD);
-		CMP_SET_FLAG_MAJ("pmc", PMC);
-		CMP_SET_FLAG_MAJ("ctx", CTX);
-		CMP_SET_FLAG_MAJ("own", OWN);
-		CMP_SET_FLAG_MAJ("prc", PRC);
-		CMP_SET_FLAG_MAJ("mdp", MDP);
-		CMP_SET_FLAG_MAJ("cpu", CPU);
-
-		CMP_SET_FLAG_MIN("all", ALL);
-		CMP_SET_FLAG_MIN("rel", REL);
-		CMP_SET_FLAG_MIN("ops", OPS);
-		CMP_SET_FLAG_MIN("ini", INI);
-		CMP_SET_FLAG_MIN("fnd", FND);
-		CMP_SET_FLAG_MIN("pmh", PMH);
-		CMP_SET_FLAG_MIN("pms", PMS);
-		CMP_SET_FLAG_MIN("orm", ORM);
-		CMP_SET_FLAG_MIN("omr", OMR);
-		CMP_SET_FLAG_MIN("tlk", TLK);
-		CMP_SET_FLAG_MIN("tul", TUL);
-		CMP_SET_FLAG_MIN("ext", EXT);
-		CMP_SET_FLAG_MIN("exc", EXC);
-		CMP_SET_FLAG_MIN("frk", FRK);
-		CMP_SET_FLAG_MIN("att", ATT);
-		CMP_SET_FLAG_MIN("swi", SWI);
-		CMP_SET_FLAG_MIN("swo", SWO);
-		CMP_SET_FLAG_MIN("reg", REG);
-		CMP_SET_FLAG_MIN("alr", ALR);
-		CMP_SET_FLAG_MIN("rea", REA);
-		CMP_SET_FLAG_MIN("wri", WRI);
-		CMP_SET_FLAG_MIN("cfg", CFG);
-		CMP_SET_FLAG_MIN("sta", STA);
-		CMP_SET_FLAG_MIN("sto", STO);
-		CMP_SET_FLAG_MIN("bnd", BND);
-		CMP_SET_FLAG_MIN("sel", SEL);
-		else	/* unrecognized keyword */
-			return EINVAL;
-
-		p += 4;	/* skip keyword and separator */
-	}
-
-	pmc_debugflags = (tmpflags|level);
-
-	return 0;
-}
-
-static int
-pmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS)
-{
-	char *fence, *newstr;
-	int error;
-	unsigned int n;
-
-	(void) arg1; (void) arg2; /* unused parameters */
-
-	n = sizeof(pmc_debugstr);
-	MALLOC(newstr, char *, n, M_PMC, M_ZERO|M_WAITOK);
-	(void) strlcpy(newstr, pmc_debugstr, sizeof(pmc_debugstr));
-
-	error = sysctl_handle_string(oidp, newstr, n, req);
-
-	/* if there is a new string, parse and copy it */
-	if (error == 0 && req->newptr != NULL) {
-		fence = newstr + (n < req->newlen ? n : req->newlen);
-		if ((error = pmc_debugflags_parse(newstr, fence)) == 0)
-			(void) strlcpy(pmc_debugstr, newstr,
-			    sizeof(pmc_debugstr));
-	}
-
-	FREE(newstr, M_PMC);
-
-	return error;
-}
-#endif
-
-/*
- * Concurrency Control
- *
- * The driver manages the following data structures:
- *
- *   - target process descriptors, one per target process
- *   - owner process descriptors (and attached lists), one per owner process
- *   - lookup hash tables for owner and target processes
- *   - PMC descriptors (and attached lists)
- *   - per-cpu hardware state
- *   - the 'hook' variable through which the kernel calls into
- *     this module
- *   - the machine hardware state (managed by the MD layer)
- *
- * These data structures are accessed from:
- *
- * - thread context-switch code
- * - interrupt handlers (possibly on multiple cpus)
- * - kernel threads on multiple cpus running on behalf of user
- *   processes doing system calls
- * - this driver's private kernel threads
- *
- * = Locks and Locking strategy =
- *
- * The driver uses four locking strategies for its operation:
- *
- * - There is a 'global' SX lock "pmc_sx" that is used to protect
- *   the its 'meta-data'.
- *
- *   Calls into the module (via syscall() or by the kernel) start with
- *   this lock being held in exclusive mode.  Depending on the requested
- *   operation, the lock may be downgraded to 'shared' mode to allow
- *   more concurrent readers into the module.
- *
- *   This SX lock is held in exclusive mode for any operations that
- *   modify the linkages between the driver's internal data structures.
- *
- *   The 'pmc_hook' function pointer is also protected by this lock.
- *   It is only examined with the sx lock held in exclusive mode.  The
- *   kernel module is allowed to be unloaded only with the sx lock
- *   held in exclusive mode.  In normal syscall handling, after
- *   acquiring the pmc_sx lock we first check that 'pmc_hook' is
- *   non-null before proceeding.  This prevents races between the
- *   thread unloading the module and other threads seeking to use the
- *   module.
- *
- * - Lookups of target process structures and owner process structures
- *   cannot use the global "pmc_sx" SX lock because these lookups need
- *   to happen during context switches and in other critical sections
- *   where sleeping is not allowed.  We protect these lookup tables
- *   with their own private spin-mutexes, "pmc_processhash_mtx" and
- *   "pmc_ownerhash_mtx".  These are 'leaf' mutexes, in that no other
- *   lock is acquired with these locks held.
- *
- * - Interrupt handlers work in a lock free manner.  At interrupt
- *   time, handlers look at the PMC pointer (phw->phw_pmc) configured
- *   when the PMC was started.  If this pointer is NULL, the interrupt
- *   is ignored after updating driver statistics.  We ensure that this
- *   pointer is set (using an atomic operation if necessary) before the
- *   PMC hardware is started.  Conversely, this pointer is unset atomically
- *   only after the PMC hardware is stopped.
- *
- *   We ensure that everything needed for the operation of an
- *   interrupt handler is available without it needing to acquire any
- *   locks.  We also ensure that a PMC's software state is destroyed only
- *   after the PMC is taken off hardware (on all CPUs).
- *
- * - Context-switch handling with process-private PMCs needs more
- *   care.
- *
- *   A given process may be the target of multiple PMCs.  For example,
- *   PMCATTACH and PMCDETACH may be requested by a process on one CPU
- *   while the target process is running on another.  A PMC could also
- *   be getting released because its owner is exiting.  We tackle
- *   these situations in the following manner:
- *
- *   - each target process structure 'pmc_process' has an array
- *     of 'struct pmc *' pointers, one for each hardware PMC.
- *
- *   - At context switch IN time, each "target" PMC in RUNNING state
- *     gets started on hardware and a pointer to each PMC is copied into
- *     the per-cpu phw array.  The 'runcount' for the PMC is
- *     incremented.
- *
- *   - At context switch OUT time, all process-virtual PMCs are stopped
- *     on hardware.  The saved value is added to the PMCs value field
- *     only if the PMC is in a non-deleted state (the PMCs state could
- *     have changed during the current time slice).
- *
- *     Note that since in-between a switch IN on a processor and a switch
- *     OUT, the PMC could have been released on another CPU.  Therefore
- *     context switch OUT always looks at the hardware state to turn
- *     OFF PMCs and will update a PMC's saved value only if reachable
- *     from the target process record.
- *
- *   - OP PMCRELEASE could be called on a PMC at any time (the PMC could
- *     be attached to many processes at the time of the call and could
- *     be active on multiple CPUs).
- *
- *     We prevent further scheduling of the PMC by marking it as in
- *     state 'DELETED'.  If the runcount of the PMC is non-zero then
- *     this PMC is currently running on a CPU somewhere.  The thread
- *     doing the PMCRELEASE operation waits by repeatedly doing an
- *     tsleep() till the runcount comes to zero.
- *
- */
-
-/*
- * save the cpu binding of the current kthread
- */
-
-static void
-pmc_save_cpu_binding(struct pmc_binding *pb)
-{
-	PMCDBG(CPU,BND,2, "%s", "save-cpu");
-	mtx_lock_spin(&sched_lock);
-	pb->pb_bound = sched_is_bound(curthread);
-	pb->pb_cpu   = curthread->td_oncpu;
-	mtx_unlock_spin(&sched_lock);
-	PMCDBG(CPU,BND,2, "save-cpu cpu=%d", pb->pb_cpu);
-}
-
-/*
- * restore the cpu binding of the current thread
- */
-
-static void
-pmc_restore_cpu_binding(struct pmc_binding *pb)
-{
-	PMCDBG(CPU,BND,2, "restore-cpu curcpu=%d restore=%d",
-	    curthread->td_oncpu, pb->pb_cpu);
-	mtx_lock_spin(&sched_lock);
-	if (pb->pb_bound)
-		sched_bind(curthread, pb->pb_cpu);
-	else
-		sched_unbind(curthread);
-	mtx_unlock_spin(&sched_lock);
-	PMCDBG(CPU,BND,2, "%s", "restore-cpu done");
-}
-
-/*
- * move execution over the specified cpu and bind it there.
- */
-
-static void
-pmc_select_cpu(int cpu)
-{
-	KASSERT(cpu >= 0 && cpu < mp_ncpus,
-	    ("[pmc,%d] bad cpu number %d", __LINE__, cpu));
-
-	/* never move to a disabled CPU */
-	KASSERT(pmc_cpu_is_disabled(cpu) == 0, ("[pmc,%d] selecting "
-	    "disabled CPU %d", __LINE__, cpu));
-
-	PMCDBG(CPU,SEL,2, "select-cpu cpu=%d", cpu);
-	mtx_lock_spin(&sched_lock);
-	sched_bind(curthread, cpu);
-	mtx_unlock_spin(&sched_lock);
-
-	KASSERT(curthread->td_oncpu == cpu,
-	    ("[pmc,%d] CPU not bound [cpu=%d, curr=%d]", __LINE__,
-		cpu, curthread->td_oncpu));
-
-	PMCDBG(CPU,SEL,2, "select-cpu cpu=%d ok", cpu);
-}
-
-/*
- * Update the per-pmc histogram
- */
-
-void
-pmc_update_histogram(struct pmc_hw *phw, uintptr_t pc)
-{
-	(void) phw;
-	(void) pc;
-}
-
-/*
- * Send a signal to a process.  This is meant to be invoked from an
- * interrupt handler.
- */
-
-void
-pmc_send_signal(struct pmc *pmc)
-{
-	(void) pmc;	/* shutup gcc */
-
-#if	0
-	struct proc   *proc;
-	struct thread *td;
-
-	KASSERT(pmc->pm_owner != NULL,
-	    ("[pmc,%d] No owner for PMC", __LINE__));
-
-	KASSERT((pmc->pm_owner->po_flags & PMC_FLAG_IS_OWNER) &&
-	    (pmc->pm_owner->po_flags & PMC_FLAG_HAS_TS_PMC),
-	    ("[pmc,%d] interrupting PMC owner has wrong flags 0x%x",
-		__LINE__, pmc->pm_owner->po_flags));
-
-	proc = pmc->pm_owner->po_owner;
-
-	KASSERT(curthread->td_proc == proc,
-	    ("[pmc,%d] interruping the wrong thread (owner %p, "
-		"cur %p)", __LINE__, (void *) proc, curthread->td_proc));
-
-	mtx_lock_spin(&sched_lock);
-	td = TAILQ_FIRST(&proc->p_threads);
-	mtx_unlock_spin(&sched_lock);
-	/* XXX RACE HERE: can 'td' disappear now? */
-	trapsignal(td, SIGPROF, 0);
-	/* XXX rework this to use the regular 'psignal' interface from a
-	   helper thread */
-#endif
-
-}
-
-/*
- * remove an process owning PMCs
- */
-
-void
-pmc_remove_owner(struct pmc_owner *po)
-{
-	struct pmc_list *pl, *tmp;
-
-	sx_assert(&pmc_sx, SX_XLOCKED);
-
-	PMCDBG(OWN,ORM,1, "remove-owner po=%p", po);
-
-	/* Remove descriptor from the owner hash table */
-	LIST_REMOVE(po, po_next);
-
-	/* pass 1: release all owned PMC descriptors */
-	LIST_FOREACH_SAFE(pl, &po->po_pmcs, pl_next, tmp) {
-
-		PMCDBG(OWN,ORM,2, "pl=%p pmc=%p", pl, pl->pl_pmc);
-
-		/* remove the associated PMC descriptor, if present */
-		if (pl->pl_pmc)
-			pmc_release_pmc_descriptor(pl->pl_pmc);
-
-		/* remove the linked list entry */
-		LIST_REMOVE(pl, pl_next);
-		FREE(pl, M_PMC);
-	}
-
-	/* pass 2: delete the pmc_list chain */
-	LIST_FOREACH_SAFE(pl, &po->po_pmcs, pl_next, tmp) {
-		KASSERT(pl->pl_pmc == NULL,
-		    ("[pmc,%d] non-null pmc pointer", __LINE__));
-		LIST_REMOVE(pl, pl_next);
-		FREE(pl, M_PMC);
-	}
-
-	KASSERT(LIST_EMPTY(&po->po_pmcs),
-		("[pmc,%d] PMC list not empty", __LINE__));
-
-
-	/*
-	 * If this process owns a log file used for system wide logging,
-	 * remove the log file.
-	 *
-	 * XXX rework needed.
-	 */
-
-	if (po->po_flags & PMC_FLAG_OWNS_LOGFILE)
-		pmc_configure_log(po, -1);
-
-}
-
-/*
- * remove an owner process record if all conditions are met.
- */
-
-static void
-pmc_maybe_remove_owner(struct pmc_owner *po)
-{
-
-	PMCDBG(OWN,OMR,1, "maybe-remove-owner po=%p", po);
-
-	/*
-	 * Remove owner record if
-	 * - this process does not own any PMCs
-	 * - this process has not allocated a system-wide sampling buffer
-	 */
-
-	if (LIST_EMPTY(&po->po_pmcs) &&
-	    ((po->po_flags & PMC_FLAG_OWNS_LOGFILE) == 0)) {
-		pmc_remove_owner(po);
-		FREE(po, M_PMC);
-	}
-}
-
-/*
- * Add an association between a target process and a PMC.
- */
-
-static void
-pmc_link_target_process(struct pmc *pm, struct pmc_process *pp)
-{
-	int ri;
-	struct pmc_target *pt;
-
-	sx_assert(&pmc_sx, SX_XLOCKED);
-
-	KASSERT(pm != NULL && pp != NULL,
-	    ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp));
-
-	KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt < ((int) md->pmd_npmc - 1),
-	    ("[pmc,%d] Illegal reference count %d for process record %p",
-		__LINE__, pp->pp_refcnt, (void *) pp));
-
-	ri = pm->pm_rowindex;
-
-	PMCDBG(PRC,TLK,1, "link-target pmc=%p ri=%d pmc-process=%p",
-	    pm, ri, pp);
-
-#if	DEBUG
-	LIST_FOREACH(pt, &pm->pm_targets, pt_next)
-	    if (pt->pt_process == pp)
-		    KASSERT(0, ("[pmc,%d] pp %p already in pmc %p targets",
-				__LINE__, pp, pm));
-#endif
-
-	MALLOC(pt, struct pmc_target *, sizeof(struct pmc_target),
-	    M_PMC, M_ZERO|M_WAITOK);
-
-	pt->pt_process = pp;
-
-	LIST_INSERT_HEAD(&pm->pm_targets, pt, pt_next);
-
-	atomic_store_rel_ptr(&pp->pp_pmcs[ri].pp_pmc, pm);
-
-	pp->pp_refcnt++;
-
-}
-
-/*
- * Removes the association between a target process and a PMC.
- */
-
-static void
-pmc_unlink_target_process(struct pmc *pm, struct pmc_process *pp)
-{
-	int ri;
-	struct pmc_target *ptgt;
-
-	sx_assert(&pmc_sx, SX_XLOCKED);
-
-	KASSERT(pm != NULL && pp != NULL,
-	    ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp));
-
-	KASSERT(pp->pp_refcnt >= 1 && pp->pp_refcnt < (int) md->pmd_npmc,
-	    ("[pmc,%d] Illegal ref count %d on process record %p",
-		__LINE__, pp->pp_refcnt, (void *) pp));
-
-	ri = pm->pm_rowindex;
-
-	PMCDBG(PRC,TUL,1, "unlink-target pmc=%p ri=%d pmc-process=%p",
-	    pm, ri, pp);
-
-	KASSERT(pp->pp_pmcs[ri].pp_pmc == pm,
-	    ("[pmc,%d] PMC ri %d mismatch pmc %p pp->[ri] %p", __LINE__,
-		ri, pm, pp->pp_pmcs[ri].pp_pmc));
-
-	pp->pp_pmcs[ri].pp_pmc = NULL;
-	pp->pp_pmcs[ri].pp_pmcval = (pmc_value_t) 0;
-
-	pp->pp_refcnt--;
-
-	/* Remove the target process from the PMC structure */
-	LIST_FOREACH(ptgt, &pm->pm_targets, pt_next)
-		if (ptgt->pt_process == pp)
-			break;
-
-	KASSERT(ptgt != NULL, ("[pmc,%d] process %p (pp: %p) not found "
-		    "in pmc %p", __LINE__, pp->pp_proc, pp, pm));
-
-	PMCDBG(PRC,TUL,4, "unlink ptgt=%p", ptgt);
-
-	LIST_REMOVE(ptgt, pt_next);
-	FREE(ptgt, M_PMC);
-}
-
-/*
- * Remove PMC descriptor 'pmc' from the owner descriptor.
- */
-
-void
-pmc_unlink_owner(struct pmc *pm)
-{
-	struct pmc_list	*pl, *tmp;
-	struct pmc_owner *po;
-
-#if	DEBUG
-	KASSERT(LIST_EMPTY(&pm->pm_targets),
-	    ("[pmc,%d] unlinking PMC with targets", __LINE__));
-#endif
-
-	po = pm->pm_owner;
-
-	KASSERT(po != NULL, ("[pmc,%d] No owner for PMC", __LINE__));
-
-	LIST_FOREACH_SAFE(pl, &po->po_pmcs, pl_next, tmp) {
-		if (pl->pl_pmc == pm) {
-			pl->pl_pmc    = NULL;
-			pm->pm_owner = NULL;
-			return;
-		}
-	}
-
-	KASSERT(0, ("[pmc,%d] couldn't find pmc in owner list", __LINE__));
-}
-
-/*
- * Check if PMC 'pm' may be attached to target process 't'.
- */
-
-static int
-pmc_can_attach(struct pmc *pm, struct proc *t)
-{
-	struct proc *o;		/* pmc owner */
-	struct ucred *oc, *tc;	/* owner, target credentials */
-	int decline_attach, i;
-
-	/*
-	 * A PMC's owner can always attach that PMC to itself.
-	 */
-
-	if ((o = pm->pm_owner->po_owner) == t)
-		return 0;
-
-	PROC_LOCK(o);
-	oc = o->p_ucred;
-	crhold(oc);
-	PROC_UNLOCK(o);
-
-	PROC_LOCK(t);
-	tc = t->p_ucred;
-	crhold(tc);
-	PROC_UNLOCK(t);
-
-	/*
-	 * The effective uid of the PMC owner should match at least one
-	 * of the {effective,real,saved} uids of the target process.
-	 */
-
-	decline_attach = oc->cr_uid != tc->cr_uid &&
-	    oc->cr_uid != tc->cr_svuid &&
-	    oc->cr_uid != tc->cr_ruid;
-
-	/*
-	 * Every one of the target's group ids, must be in the owner's
-	 * group list.
-	 */
-	for (i = 0; !decline_attach && i < tc->cr_ngroups; i++)
-		decline_attach = !groupmember(tc->cr_groups[i], oc);
-
-	/* check the read and saved gids too */
-	if (decline_attach == 0)
-		decline_attach = !groupmember(tc->cr_rgid, oc) ||
-		    !groupmember(tc->cr_svgid, oc);
-
-	crfree(tc);
-	crfree(oc);
-
-	return !decline_attach;
-}
-
-/*
- * Attach a process to a PMC.
- */
-
-static int
-pmc_attach_one_process(struct proc *p, struct pmc *pm)
-{
-	int ri;
-	struct pmc_process	*pp;
-
-	sx_assert(&pmc_sx, SX_XLOCKED);
-
-	PMCDBG(PRC,ATT,2, "attach-one pm=%p ri=%d proc=%p (%d, %s)", pm,
-	    pm->pm_rowindex, p, p->p_pid, p->p_comm);
-
-	/*
-	 * Locate the process descriptor corresponding to process 'p',
-	 * allocating space as needed.
-	 *
-	 * Verify that rowindex 'pm_rowindex' is free in the process
-	 * descriptor.
-	 *
-	 * If not, allocate space for a descriptor and link the
-	 * process descriptor and PMC.
-	 */
-
-	ri = pm->pm_rowindex;
-
-	if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_ALLOCATE)) == NULL)
-		return ENOMEM;
-
-	if (pp->pp_pmcs[ri].pp_pmc == pm) /* already present at slot [ri] */
-		return EEXIST;
-
-	if (pp->pp_pmcs[ri].pp_pmc != NULL)
-		return EBUSY;
-
-	pmc_link_target_process(pm, pp);
-
-	/* mark process as using HWPMCs */
-	PROC_LOCK(p);
-	p->p_flag |= P_HWPMC;
-	PROC_UNLOCK(p);
-
-	return 0;
-}
-
-/*
- * Attach a process and optionally its children
- */
-
-static int
-pmc_attach_process(struct proc *p, struct pmc *pm)
-{
-	int error;
-	struct proc *top;
-
-	sx_assert(&pmc_sx, SX_XLOCKED);
-
-	PMCDBG(PRC,ATT,1, "attach pm=%p ri=%d proc=%p (%d, %s)", pm,
-	    pm->pm_rowindex, p, p->p_pid, p->p_comm);
-
-	if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0)
-		return pmc_attach_one_process(p, pm);
-
-	/*
-	 * Traverse all child processes, attaching them to
-	 * this PMC.
-	 */
-
-	sx_slock(&proctree_lock);
-
-	top = p;
-
-	for (;;) {
-		if ((error = pmc_attach_one_process(p, pm)) != 0)
-			break;
-		if (!LIST_EMPTY(&p->p_children))
-			p = LIST_FIRST(&p->p_children);
-		else for (;;) {
-			if (p == top)
-				goto done;
-			if (LIST_NEXT(p, p_sibling)) {
-				p = LIST_NEXT(p, p_sibling);
-				break;
-			}
-			p = p->p_pptr;
-		}
-	}
-
-	if (error)
-		(void) pmc_detach_process(top, pm);
-
- done:
-	sx_sunlock(&proctree_lock);
-	return error;
-}
-
-/*
- * Detach a process from a PMC.  If there are no other PMCs tracking
- * this process, remove the process structure from its hash table.  If
- * 'flags' contains PMC_FLAG_REMOVE, then free the process structure.
- */
-
-static int
-pmc_detach_one_process(struct proc *p, struct pmc *pm, int flags)
-{
-	int ri;
-	struct pmc_process *pp;
-
-	sx_assert(&pmc_sx, SX_XLOCKED);
-
-	KASSERT(pm != NULL,
-	    ("[pmc,%d] null pm pointer", __LINE__));
-
-	PMCDBG(PRC,ATT,2, "detach-one pm=%p ri=%d proc=%p (%d, %s) flags=0x%x",
-	    pm, pm->pm_rowindex, p, p->p_pid, p->p_comm, flags);
-
-	ri = pm->pm_rowindex;
-
-	if ((pp = pmc_find_process_descriptor(p, 0)) == NULL)
-		return ESRCH;
-
-	if (pp->pp_pmcs[ri].pp_pmc != pm)
-		return EINVAL;
-
-	pmc_unlink_target_process(pm, pp);
-
-	/*
-	 * If there are no PMCs targetting this process, we remove its
-	 * descriptor from the target hash table and unset the P_HWPMC
-	 * flag in the struct proc.
-	 */
-
-	KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt < (int) md->pmd_npmc,
-	    ("[pmc,%d] Illegal refcnt %d for process struct %p",
-		__LINE__, pp->pp_refcnt, pp));
-
-	if (pp->pp_refcnt != 0)	/* still a target of some PMC */
-		return 0;
-
-	pmc_remove_process_descriptor(pp);
-
-	if (flags & PMC_FLAG_REMOVE)
-		FREE(pp, M_PMC);
-
-	PROC_LOCK(p);
-	p->p_flag &= ~P_HWPMC;
-	PROC_UNLOCK(p);
-
-	return 0;
-}
-
-/*
- * Detach a process and optionally its descendants from a PMC.
- */
-
-static int
-pmc_detach_process(struct proc *p, struct pmc *pm)
-{
-	struct proc *top;
-
-	sx_assert(&pmc_sx, SX_XLOCKED);
-
-	PMCDBG(PRC,ATT,1, "detach pm=%p ri=%d proc=%p (%d, %s)", pm,
-	    pm->pm_rowindex, p, p->p_pid, p->p_comm);
-
-	if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0)
-		return pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE);
-
-	/*
-	 * Traverse all children, detaching them from this PMC.  We
-	 * ignore errors since we could be detaching a PMC from a
-	 * partially attached proc tree.
-	 */
-
-	sx_slock(&proctree_lock);
-
-	top = p;
-
-	for (;;) {
-		(void) pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE);
-
-		if (!LIST_EMPTY(&p->p_children))
-			p = LIST_FIRST(&p->p_children);
-		else for (;;) {
-			if (p == top)
-				goto done;
-			if (LIST_NEXT(p, p_sibling)) {
-				p = LIST_NEXT(p, p_sibling);
-				break;
-			}
-			p = p->p_pptr;
-		}
-	}
-
- done:
-	sx_sunlock(&proctree_lock);
-	return 0;
-}
-
-/*
- * The 'hook' invoked from the kernel proper
- */
-
-
-#if	DEBUG
-const char *pmc_hooknames[] = {
-	"",
-	"EXIT",
-	"EXEC",
-	"FORK",
-	"CSW-IN",
-	"CSW-OUT"
-};
-#endif
-
-static int
-pmc_hook_handler(struct thread *td, int function, void *arg)
-{
-
-	KASSERT(td->td_proc->p_flag & P_HWPMC,
-	    ("[pmc,%d] unregistered thread called pmc_hook()", __LINE__));
-
-	PMCDBG(MOD,PMH,1, "hook td=%p func=%d \"%s\" arg=%p", td, function,
-	    pmc_hooknames[function], arg);
-
-	switch (function)
-	{
-
-	/*
-	 * Process exit.
-	 *
-	 * Remove this process from all hash tables.  If this process
-	 * owned any PMCs, turn off those PMCs and deallocate them,
-	 * removing any associations with target processes.
-	 *
-	 * This function will be called by the last 'thread' of a
-	 * process.
-	 *
-	 */
-
-	case PMC_FN_PROCESS_EXIT: /* release PMCs */
-	{
-		int cpu;
-		unsigned int ri;
-		struct pmc *pm;
-		struct pmc_hw *phw;
-		struct pmc_process *pp;
-		struct pmc_owner *po;
-		struct proc *p;
-		pmc_value_t newvalue, tmp;
-
-		sx_assert(&pmc_sx, SX_XLOCKED);
-
-		p = (struct proc *) arg;
-
-		/*
-		 * Since this code is invoked by the last thread in an
-		 * exiting process, we would have context switched IN
-		 * at some prior point.  Kernel mode context switches
-		 * may happen any time, so we want to disable a context
-		 * switch OUT till we get any PMCs targetting this
-		 * process off the hardware.
-		 *
-		 * We also need to atomically remove this process'
-		 * entry from our target process hash table, using
-		 * PMC_FLAG_REMOVE.
-		 */
-
-		PMCDBG(PRC,EXT,1, "process-exit proc=%p (%d, %s)", p, p->p_pid,
-		    p->p_comm);
-
-		critical_enter(); /* no preemption */
-
-		cpu = curthread->td_oncpu;
-
-		if ((pp = pmc_find_process_descriptor(p,
-			 PMC_FLAG_REMOVE)) != NULL) {
-
-			PMCDBG(PRC,EXT,2,
-			    "process-exit proc=%p pmc-process=%p", p, pp);
-
-			/*
-			 * This process could the target of some PMCs.
-			 * Such PMCs will thus be running on currently
-			 * executing CPU at this point in the code
-			 * since we've disallowed context switches.
-			 * We need to turn these PMCs off like we
-			 * would do at context switch OUT time.
-			 */
-
-			for (ri = 0; ri < md->pmd_npmc; ri++) {
-
-				/*
-				 * Pick up the pmc pointer from hardware
-				 * state similar to the CSW_OUT code.
-				 */
-
-				phw = pmc_pcpu[cpu]->pc_hwpmcs[ri];
-				pm  = phw->phw_pmc;
-
-				PMCDBG(PRC,EXT,2, "ri=%d pm=%p", ri, pm);
-
-				if (pm == NULL ||
-				    !PMC_IS_VIRTUAL_MODE(pm->pm_mode))
-					continue;
-
-				PMCDBG(PRC,EXT,2, "ppmcs[%d]=%p pm=%p "
-				    "state=%d", ri, pp->pp_pmcs[ri].pp_pmc,
-				    pm, pm->pm_state);
-
-				KASSERT(pm->pm_rowindex == ri,
-				    ("[pmc,%d] ri mismatch pmc(%d) ri(%d)",
-					__LINE__, pm->pm_rowindex, ri));
-
-				KASSERT(pm == pp->pp_pmcs[ri].pp_pmc,
-				    ("[pmc,%d] pm %p != pp_pmcs[%d] %p",
-					__LINE__, pm, ri,
-					pp->pp_pmcs[ri].pp_pmc));
-
-				(void) md->pmd_stop_pmc(cpu, ri);
-
-				KASSERT(pm->pm_runcount > 0,
-				    ("[pmc,%d] bad runcount ri %d rc %d",
-					__LINE__, ri, pm->pm_runcount));
-
-				if (pm->pm_state == PMC_STATE_RUNNING) {
-					md->pmd_read_pmc(cpu, ri, &newvalue);
-					tmp = newvalue -
-					    PMC_PCPU_SAVED(cpu,ri);
-
-					mtx_pool_lock_spin(pmc_mtxpool, pm);
-					pm->pm_gv.pm_savedvalue += tmp;
-					pp->pp_pmcs[ri].pp_pmcval += tmp;
-					mtx_pool_unlock_spin(pmc_mtxpool, pm);
-				}
-
-				KASSERT((int) pm->pm_runcount >= 0,
-				    ("[pmc,%d] runcount is %d", __LINE__, ri));
-
-				atomic_subtract_rel_32(&pm->pm_runcount,1);
-				(void) md->pmd_config_pmc(cpu, ri, NULL);
-			}
-			critical_exit(); /* ok to be pre-empted now */
-
-			/*
-			 * Unlink this process from the PMCs that are
-			 * targetting it.  Log value at exit() time if
-			 * requested.
-			 */
-
-			for (ri = 0; ri < md->pmd_npmc; ri++)
-				if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) {
-					if (pm->pm_flags &
-					    PMC_F_LOG_TC_PROCEXIT)
-						pmc_log_process_exit(pm, pp);
-					pmc_unlink_target_process(pm, pp);
-				}
-
-			FREE(pp, M_PMC);
-
-		} else
-			critical_exit(); /* pp == NULL */
-
-		/*
-		 * If the process owned PMCs, free them up and free up
-		 * memory.
-		 */
-
-		if ((po = pmc_find_owner_descriptor(p)) != NULL) {
-			pmc_remove_owner(po);
-			FREE(po, M_PMC);
-		}
-
-	}
-	break;
-
-	/*
-	 * Process exec()
-	 */
-
-	case PMC_FN_PROCESS_EXEC:
-	{
-		int *credentials_changed;
-		unsigned int ri;
-		struct pmc *pm;
-		struct proc *p;
-		struct pmc_owner *po;
-		struct pmc_process *pp;
-
-		sx_assert(&pmc_sx, SX_XLOCKED);
-
-		/*
-		 * PMCs are not inherited across an exec():  remove any
-		 * PMCs that this process is the owner of.
-		 */
-
-		p = td->td_proc;
-
-		if ((po = pmc_find_owner_descriptor(p)) != NULL) {
-			pmc_remove_owner(po);
-			FREE(po, M_PMC);
-		}
-
-		/*
-		 * If this process is the target of a PMC, check if the new
-		 * credentials are compatible with the owner's permissions.
-		 */
-
-		if ((pp = pmc_find_process_descriptor(p, 0)) == NULL)
-			break;
-
-		credentials_changed = arg;
-
-		PMCDBG(PRC,EXC,1, "exec proc=%p (%d, %s) cred-changed=%d",
-		    p, p->p_pid, p->p_comm, *credentials_changed);
-
-		if (*credentials_changed == 0) /* credentials didn't change */
-			break;
-
-		/*
-		 * If the newly exec()'ed process has a different credential
-		 * than before, allow it to be the target of a PMC only if
-		 * the PMC's owner has sufficient priviledge.
-		 */
-
-		for (ri = 0; ri < md->pmd_npmc; ri++)
-			if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL)
-				if (pmc_can_attach(pm, td->td_proc) != 0)
-					pmc_detach_one_process(td->td_proc,
-					    pm, PMC_FLAG_NONE);
-
-		KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt < (int) md->pmd_npmc,
-		    ("[pmc,%d] Illegal ref count %d on pp %p", __LINE__,
-			pp->pp_refcnt, pp));
-
-		/*
-		 * If this process is no longer the target of any
-		 * PMCs, we can remove the process entry and free
-		 * up space.
-		 */
-
-		if (pp->pp_refcnt == 0) {
-			pmc_remove_process_descriptor(pp);
-			FREE(pp, M_PMC);
-		}
-	}
-	break;
-
-	/*
-	 * Process fork()
-	 */
-
-	case PMC_FN_PROCESS_FORK:
-	{
-		unsigned int ri;
-		uint32_t do_descendants;
-		struct pmc *pm;
-		struct pmc_process *ppnew, *ppold;
-		struct proc *newproc;
-
-		sx_assert(&pmc_sx, SX_XLOCKED);
-
-		newproc = (struct proc *) arg;
-
-		PMCDBG(PMC,FRK,2, "process-fork p1=%p p2=%p",
-		    curthread->td_proc, newproc);
-		/*
-		 * If the parent process (curthread->td_proc) is a
-		 * target of any PMCs, look for PMCs that are to be
-		 * inherited, and link these into the new process
-		 * descriptor.
-		 */
-
-		if ((ppold = pmc_find_process_descriptor(
-		    curthread->td_proc, PMC_FLAG_NONE)) == NULL)
-			break;
-
-		do_descendants = 0;
-		for (ri = 0; ri < md->pmd_npmc; ri++)
-			if ((pm = ppold->pp_pmcs[ri].pp_pmc) != NULL)
-				do_descendants |=
-				    pm->pm_flags & PMC_F_DESCENDANTS;
-		if (do_descendants == 0) /* nothing to do */
-			break;
-
-		if ((ppnew = pmc_find_process_descriptor(newproc,
-		    PMC_FLAG_ALLOCATE)) == NULL)
-			return ENOMEM;
-
-		/*
-		 * Run through all PMCs targeting the old process and
-		 * attach them to the new process.
-		 */
-
-		for (ri = 0; ri < md->pmd_npmc; ri++)
-			if ((pm = ppold->pp_pmcs[ri].pp_pmc) != NULL &&
-			    pm->pm_flags & PMC_F_DESCENDANTS)
-				pmc_link_target_process(pm, ppnew);
-
-		/*
-		 * Now mark the new process as being tracked by this
-		 * driver.
-		 */
-
-		PROC_LOCK(newproc);
-		newproc->p_flag |= P_HWPMC;
-		PROC_UNLOCK(newproc);
-
-	}
-	break;
-
-	/*
-	 * Thread context switch IN
-	 */
-
-	case PMC_FN_CSW_IN:
-	{
-		int cpu;
-		unsigned int ri;
-		struct pmc *pm;
-		struct proc *p;
-		struct pmc_cpu *pc;
-		struct pmc_hw *phw;
-		struct pmc_process *pp;
-		pmc_value_t newvalue;
-
-		p = td->td_proc;
-
-		if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE)) == NULL)
-			break;
-
-		KASSERT(pp->pp_proc == td->td_proc,
-		    ("[pmc,%d] not my thread state", __LINE__));
-
-		critical_enter(); /* no preemption on this CPU */
-
-		cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */
-
-		PMCDBG(CTX,SWI,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p,
-		    p->p_pid, p->p_comm, pp);
-
-		KASSERT(cpu >= 0 && cpu < mp_ncpus,
-		    ("[pmc,%d] wierd CPU id %d", __LINE__, cpu));
-
-		pc = pmc_pcpu[cpu];
-
-		for (ri = 0; ri < md->pmd_npmc; ri++) {
-
-			if ((pm = pp->pp_pmcs[ri].pp_pmc) == NULL)
-				continue;
-
-			KASSERT(PMC_IS_VIRTUAL_MODE(pm->pm_mode),
-			    ("[pmc,%d] Target PMC in non-virtual mode (%d)",
-				__LINE__, pm->pm_mode));
-
-			KASSERT(pm->pm_rowindex == ri,
-			    ("[pmc,%d] Row index mismatch pmc %d != ri %d",
-				__LINE__, pm->pm_rowindex, ri));
-
-			/*
-			 * Only PMCs that are marked as 'RUNNING' need
-			 * be placed on hardware.
-			 */
-
-			if (pm->pm_state != PMC_STATE_RUNNING)
-				continue;
-
-			/* increment PMC runcount */
-			atomic_add_rel_32(&pm->pm_runcount, 1);
-
-			/* configure the HWPMC we are going to use. */
-			md->pmd_config_pmc(cpu, ri, pm);
-
-			phw = pc->pc_hwpmcs[ri];
-
-			KASSERT(phw != NULL,
-			    ("[pmc,%d] null hw pointer", __LINE__));
-
-			KASSERT(phw->phw_pmc == pm,
-			    ("[pmc,%d] hw->pmc %p != pmc %p", __LINE__,
-				phw->phw_pmc, pm));
-
-			/* write out saved value and start the PMC */
-			mtx_pool_lock_spin(pmc_mtxpool, pm);
-			newvalue = PMC_PCPU_SAVED(cpu, ri) =
-			    pm->pm_gv.pm_savedvalue;
-			mtx_pool_unlock_spin(pmc_mtxpool, pm);
-
-			md->pmd_write_pmc(cpu, ri, newvalue);
-			md->pmd_start_pmc(cpu, ri);
-
-		}
-
-		/*
-		 * perform any other architecture/cpu dependent thread
-		 * switch-in actions.
-		 */
-
-		(void) (*md->pmd_switch_in)(pc);
-
-		critical_exit();
-
-	}
-	break;
-
-	/*
-	 * Thread context switch OUT.
-	 */
-
-	case PMC_FN_CSW_OUT:
-	{
-		int cpu;
-		unsigned int ri;
-		struct pmc *pm;
-		struct proc *p;
-		struct pmc_cpu *pc;
-		struct pmc_hw *phw;
-		struct pmc_process *pp;
-		pmc_value_t newvalue, tmp;
-
-		/*
-		 * Locate our process descriptor; this may be NULL if
-		 * this process is exiting and we have already removed
-		 * the process from the target process table.
-		 *
-		 * Note that due to kernel preemption, multiple
-		 * context switches may happen while the process is
-		 * exiting.
-		 *
-		 * Note also that if the target process cannot be
-		 * found we still need to deconfigure any PMCs that
-		 * are currently running on hardware.
-		 */
-
-		p = td->td_proc;
-		pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE);
-
-		/*
-		 * save PMCs
-		 */
-
-		critical_enter();
-
-		cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */
-
-		PMCDBG(CTX,SWO,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p,
-		    p->p_pid, p->p_comm, pp);
-
-		KASSERT(cpu >= 0 && cpu < mp_ncpus,
-		    ("[pmc,%d wierd CPU id %d", __LINE__, cpu));
-
-		pc = pmc_pcpu[cpu];
-
-		/*
-		 * When a PMC gets unlinked from a target PMC, it will
-		 * be removed from the target's pp_pmc[] array.
-		 *
-		 * However, on a MP system, the target could have been
-		 * executing on another CPU at the time of the unlink.
-		 * So, at context switch OUT time, we need to look at
-		 * the hardware to determine if a PMC is scheduled on
-		 * it.
-		 */
-
-		for (ri = 0; ri < md->pmd_npmc; ri++) {
-
-			phw = pc->pc_hwpmcs[ri];
-			pm  = phw->phw_pmc;
-
-			if (pm == NULL)	/* nothing at this row index */
-				continue;
-
-			if (!PMC_IS_VIRTUAL_MODE(pm->pm_mode))
-				continue; /* not a process virtual PMC */
-
-			KASSERT(pm->pm_rowindex == ri,
-			    ("[pmc,%d] ri mismatch pmc(%d) ri(%d)",
-				__LINE__, pm->pm_rowindex, ri));
-
-			/* Stop hardware */
-			md->pmd_stop_pmc(cpu, ri);
-
-			/* reduce this PMC's runcount */
-			atomic_subtract_rel_32(&pm->pm_runcount, 1);
-
-			/*
-			 * If this PMC is associated with this process,
-			 * save the reading.
-			 */
-
-			if (pp != NULL && pp->pp_pmcs[ri].pp_pmc != NULL) {
-
-				KASSERT(pm == pp->pp_pmcs[ri].pp_pmc,
-				    ("[pmc,%d] pm %p != pp_pmcs[%d] %p",
-					__LINE__, pm, ri,
-					pp->pp_pmcs[ri].pp_pmc));
-
-				KASSERT(pp->pp_refcnt > 0,
-				    ("[pmc,%d] pp refcnt = %d", __LINE__,
-					pp->pp_refcnt));
-
-				md->pmd_read_pmc(cpu, ri, &newvalue);
-
-				tmp = newvalue - PMC_PCPU_SAVED(cpu,ri);
-
-				KASSERT((int64_t) tmp >= 0,
-				    ("[pmc,%d] negative increment cpu=%d "
-					"ri=%d newvalue=%jx saved=%jx "
-					"incr=%jx", __LINE__, cpu, ri,
-					newvalue, PMC_PCPU_SAVED(cpu,ri),
-					tmp));
-
-				/*
-				 * Increment the PMC's count and this
-				 * target process's count by the difference
-				 * between the current reading and the
-				 * saved value at context switch in time.
-				 */
-
-				mtx_pool_lock_spin(pmc_mtxpool, pm);
-
-				pm->pm_gv.pm_savedvalue += tmp;
-				pp->pp_pmcs[ri].pp_pmcval += tmp;
-
-				mtx_pool_unlock_spin(pmc_mtxpool, pm);
-
-			}
-
-			/* mark hardware as free */
-			md->pmd_config_pmc(cpu, ri, NULL);
-		}
-
-		/*
-		 * perform any other architecture/cpu dependent thread
-		 * switch out functions.
-		 */
-
-		(void) (*md->pmd_switch_out)(pc);
-
-		critical_exit();
-
-	}
-	break;
-
-	default:
-#if DEBUG
-		KASSERT(0, ("[pmc,%d] unknown hook %d\n", __LINE__, function));
-#endif
-		break;
-
-	}
-
-	return 0;
-}
-
-/*
- * allocate a 'struct pmc_owner' descriptor in the owner hash table.
- */
-
-static struct pmc_owner *
-pmc_allocate_owner_descriptor(struct proc *p)
-{
-	uint32_t hindex;
-	struct pmc_owner *po;
-	struct pmc_ownerhash *poh;
-
-	hindex = PMC_HASH_PTR(p, pmc_ownerhashmask);
-	poh = &pmc_ownerhash[hindex];
-
-	/* allocate space for N pointers and one descriptor struct */
-	MALLOC(po, struct pmc_owner *, sizeof(struct pmc_owner),
-	    M_PMC, M_WAITOK);
-
-	po->po_flags = 0;
-	po->po_owner = p;
-	LIST_INIT(&po->po_pmcs);
-	LIST_INSERT_HEAD(poh, po, po_next); /* insert into hash table */
-
-	PMCDBG(OWN,ALL,1, "allocate-owner proc=%p (%d, %s) pmc-owner=%p",
-	    p, p->p_pid, p->p_comm, po);
-
-	return po;
-}
-
-/*
- * find the descriptor corresponding to process 'p', adding or removing it
- * as specified by 'mode'.
- */
-
-static struct pmc_process *
-pmc_find_process_descriptor(struct proc *p, uint32_t mode)
-{
-	uint32_t hindex;
-	struct pmc_process *pp, *ppnew;
-	struct pmc_processhash *pph;
-
-	hindex = PMC_HASH_PTR(p, pmc_processhashmask);
-	pph = &pmc_processhash[hindex];
-
-	ppnew = NULL;
-
-	/*
-	 * Pre-allocate memory in the FIND_ALLOCATE case since we
-	 * cannot call malloc(9) once we hold a spin lock.
-	 */
-
-	if (mode & PMC_FLAG_ALLOCATE) {
-		/* allocate additional space for 'n' pmc pointers */
-		MALLOC(ppnew, struct pmc_process *,
-		    sizeof(struct pmc_process) + md->pmd_npmc *
-		    sizeof(struct pmc_targetstate), M_PMC, M_ZERO|M_WAITOK);
-	}
-
-	mtx_lock_spin(&pmc_processhash_mtx);
-	LIST_FOREACH(pp, pph, pp_next)
-	    if (pp->pp_proc == p)
-		    break;
-
-	if ((mode & PMC_FLAG_REMOVE) && pp != NULL)
-		LIST_REMOVE(pp, pp_next);
-
-	if ((mode & PMC_FLAG_ALLOCATE) && pp == NULL &&
-	    ppnew != NULL) {
-		ppnew->pp_proc = p;
-		LIST_INSERT_HEAD(pph, ppnew, pp_next);
-		pp = ppnew;
-		ppnew = NULL;
-	}
-	mtx_unlock_spin(&pmc_processhash_mtx);
-
-	if (pp != NULL && ppnew != NULL)
-		FREE(ppnew, M_PMC);
-
-	return pp;
-}
-
-/*
- * remove a process descriptor from the process hash table.
- */
-
-static void
-pmc_remove_process_descriptor(struct pmc_process *pp)
-{
-	KASSERT(pp->pp_refcnt == 0,
-	    ("[pmc,%d] Removing process descriptor %p with count %d",
-		__LINE__, pp, pp->pp_refcnt));
-
-	mtx_lock_spin(&pmc_processhash_mtx);
-	LIST_REMOVE(pp, pp_next);
-	mtx_unlock_spin(&pmc_processhash_mtx);
-}
-
-
-/*
- * find an owner descriptor corresponding to proc 'p'
- */
-
-static struct pmc_owner *
-pmc_find_owner_descriptor(struct proc *p)
-{
-	uint32_t hindex;
-	struct pmc_owner *po;
-	struct pmc_ownerhash *poh;
-
-	hindex = PMC_HASH_PTR(p, pmc_ownerhashmask);
-	poh = &pmc_ownerhash[hindex];
-
-	po = NULL;
-	LIST_FOREACH(po, poh, po_next)
-	    if (po->po_owner == p)
-		    break;
-
-	PMCDBG(OWN,FND,1, "find-owner proc=%p (%d, %s) hindex=0x%x -> "
-	    "pmc-owner=%p", p, p->p_pid, p->p_comm, hindex, po);
-
-	return po;
-}
-
-/*
- * pmc_allocate_pmc_descriptor
- *
- * Allocate a pmc descriptor and initialize its
- * fields.
- */
-
-static struct pmc *
-pmc_allocate_pmc_descriptor(void)
-{
-	struct pmc *pmc;
-
-	MALLOC(pmc, struct pmc *, sizeof(struct pmc), M_PMC, M_ZERO|M_WAITOK);
-
-	if (pmc != NULL) {
-		pmc->pm_owner = NULL;
-		LIST_INIT(&pmc->pm_targets);
-	}
-
-	PMCDBG(PMC,ALL,1, "allocate-pmc -> pmc=%p", pmc);
-
-	return pmc;
-}
-
-/*
- * Destroy a pmc descriptor.
- */
-
-static void
-pmc_destroy_pmc_descriptor(struct pmc *pm)
-{
-	(void) pm;
-
-#if	DEBUG
-	KASSERT(pm->pm_state == PMC_STATE_DELETED ||
-	    pm->pm_state == PMC_STATE_FREE,
-	    ("[pmc,%d] destroying non-deleted PMC", __LINE__));
-	KASSERT(LIST_EMPTY(&pm->pm_targets),
-	    ("[pmc,%d] destroying pmc with targets", __LINE__));
-	KASSERT(pm->pm_owner == NULL,
-	    ("[pmc,%d] destroying pmc attached to an owner", __LINE__));
-	KASSERT(pm->pm_runcount == 0,
-	    ("[pmc,%d] pmc has non-zero run count %d", __LINE__,
-		pm->pm_runcount));
-#endif
-}
-
-/*
- * This function does the following things:
- *
- *  - detaches the PMC from hardware
- *  - unlinks all target threads that were attached to it
- *  - removes the PMC from its owner's list
- *  - destroy's the PMC private mutex
- *
- * Once this function completes, the given pmc pointer can be safely
- * FREE'd by the caller.
- */
-
-static void
-pmc_release_pmc_descriptor(struct pmc *pm)
-{
-#if	DEBUG
-	volatile int maxloop;
-#endif
-	u_int ri, cpu;
-	u_char curpri;
-	struct pmc_hw *phw;
-	struct pmc_process *pp;
-	struct pmc_target *ptgt, *tmp;
-	struct pmc_binding pb;
-
-	sx_assert(&pmc_sx, SX_XLOCKED);
-
-	KASSERT(pm, ("[pmc,%d] null pmc", __LINE__));
-
-	ri = pm->pm_rowindex;
-
-	PMCDBG(PMC,REL,1, "release-pmc pmc=%p ri=%d mode=%d", pm, ri,
-	    pm->pm_mode);
-
-	/*
-	 * First, we take the PMC off hardware.
-	 */
-	cpu = 0;
-	if (PMC_IS_SYSTEM_MODE(pm->pm_mode)) {
-
-		/*
-		 * A system mode PMC runs on a specific CPU.  Switch
-		 * to this CPU and turn hardware off.
-		 */
-
-		pmc_save_cpu_binding(&pb);
-
-		cpu = pm->pm_gv.pm_cpu;
-
-		if (pm->pm_state == PMC_STATE_RUNNING) {
-
-			pmc_select_cpu(cpu);
-
-			phw = pmc_pcpu[cpu]->pc_hwpmcs[ri];
-
-			KASSERT(phw->phw_pmc == pm,
-			    ("[pmc, %d] pmc ptr ri(%d) hw(%p) pm(%p)",
-				__LINE__, ri, phw->phw_pmc, pm));
-
-			PMCDBG(PMC,REL,2, "stopping cpu=%d ri=%d", cpu, ri);
-
-			critical_enter();
-			md->pmd_stop_pmc(cpu, ri);
-			critical_exit();
-		}
-
-		PMCDBG(PMC,REL,2, "decfg cpu=%d ri=%d", cpu, ri);
-
-		critical_enter();
-		md->pmd_config_pmc(cpu, ri, NULL);
-		critical_exit();
-
-		pm->pm_state = PMC_STATE_DELETED;
-
-		pmc_restore_cpu_binding(&pb);
-
-	} else if (PMC_IS_VIRTUAL_MODE(pm->pm_mode)) {
-
-		/*
-		 * A virtual PMC could be running on multiple CPUs at
-		 * a given instant.
-		 *
-		 * By marking its state as DELETED, we ensure that
-		 * this PMC is never further scheduled on hardware.
-		 *
-		 * Then we wait till all CPUs are done with this PMC.
-		 */
-
-		pm->pm_state = PMC_STATE_DELETED;
-
-
-		/*
-		 * Wait for the PMCs runcount to come to zero.
-		 */
-
-#if	DEBUG
-		maxloop = 100 * mp_ncpus;
-#endif
-
-		while (atomic_load_acq_32(&pm->pm_runcount) > 0) {
-
-#if	DEBUG
-			maxloop--;
-			KASSERT(maxloop > 0,
-			    ("[pmc,%d] (ri%d, rc%d) waiting too long for "
-				"pmc to be free", __LINE__, pm->pm_rowindex,
-				pm->pm_runcount));
-#endif
-
-			mtx_lock_spin(&sched_lock);
-			curpri = curthread->td_priority;
-			mtx_unlock_spin(&sched_lock);
-
-			(void) tsleep((void *) pmc_release_pmc_descriptor,
-			    curpri, "pmcrel", 1);
-
-		}
-
-		/*
-		 * At this point the PMC is off all CPUs and cannot be
-		 * freshly scheduled onto a CPU.  It is now safe to
-		 * unlink all targets from this PMC.  If a
-		 * process-record's refcount falls to zero, we remove
-		 * it from the hash table.  The module-wide SX lock
-		 * protects us from races.
-		 */
-
-		LIST_FOREACH_SAFE(ptgt, &pm->pm_targets, pt_next, tmp) {
-			pp = ptgt->pt_process;
-			pmc_unlink_target_process(pm, pp); /* frees 'ptgt' */
-
-			PMCDBG(PMC,REL,3, "pp->refcnt=%d", pp->pp_refcnt);
-
-			/*
-			 * If the target process record shows that no
-			 * PMCs are attached to it, reclaim its space.
-			 */
-
-			if (pp->pp_refcnt == 0) {
-				pmc_remove_process_descriptor(pp);
-				FREE(pp, M_PMC);
-			}
-		}
-
-		cpu = curthread->td_oncpu; /* setup cpu for pmd_release() */
-
-	}
-
-	/*
-	 * Release any MD resources
-	 */
-
-	(void) md->pmd_release_pmc(cpu, ri, pm);
-
-	/*
-	 * Update row disposition
-	 */
-
-	if (PMC_IS_SYSTEM_MODE(pm->pm_mode))
-		PMC_UNMARK_ROW_STANDALONE(ri);
-	else
-		PMC_UNMARK_ROW_THREAD(ri);
-
-	/* unlink from the owner's list */
-	if (pm->pm_owner)
-		pmc_unlink_owner(pm);
-
-	pmc_destroy_pmc_descriptor(pm);
-}
-
-/*
- * Register an owner and a pmc.
- */
-
-static int
-pmc_register_owner(struct proc *p, struct pmc *pmc)
-{
-	struct pmc_list	*pl;
-	struct pmc_owner *po;
-
-	sx_assert(&pmc_sx, SX_XLOCKED);
-
-	MALLOC(pl, struct pmc_list *, sizeof(struct pmc_list), M_PMC,
-	    M_WAITOK);
-
-	if (pl == NULL)
-		return ENOMEM;
-
-	if ((po = pmc_find_owner_descriptor(p)) == NULL) {
-		if ((po = pmc_allocate_owner_descriptor(p)) == NULL) {
-			FREE(pl, M_PMC);
-			return ENOMEM;
-		}
-		po->po_flags |= PMC_FLAG_IS_OWNER; /* real owner */
-	}
-
-	if (pmc->pm_mode == PMC_MODE_TS) {
-		/* can have only one TS mode PMC per process */
-		if (po->po_flags & PMC_FLAG_HAS_TS_PMC) {
-			FREE(pl, M_PMC);
-			return EINVAL;
-		}
-		po->po_flags |= PMC_FLAG_HAS_TS_PMC;
-	}
-
-	KASSERT(pmc->pm_owner == NULL,
-	    ("[pmc,%d] attempting to own an initialized PMC", __LINE__));
-	pmc->pm_owner  = po;
-
-	pl->pl_pmc = pmc;
-
-	LIST_INSERT_HEAD(&po->po_pmcs, pl, pl_next);
-
-	PROC_LOCK(p);
-	p->p_flag |= P_HWPMC;
-	PROC_UNLOCK(p);
-
-	PMCDBG(PMC,REG,1, "register-owner pmc-owner=%p pl=%p pmc=%p",
-	    po, pl, pmc);
-
-	return 0;
-}
-
-/*
- * Return the current row disposition:
- * == 0 => FREE
- *  > 0 => PROCESS MODE
- *  < 0 => SYSTEM MODE
- */
-
-int
-pmc_getrowdisp(int ri)
-{
-	return pmc_pmcdisp[ri];
-}
-
-/*
- * Check if a PMC at row index 'ri' can be allocated to the current
- * process.
- *
- * Allocation can fail if:
- *   - the current process is already being profiled by a PMC at index 'ri',
- *     attached to it via OP_PMCATTACH.
- *   - the current process has already allocated a PMC at index 'ri'
- *     via OP_ALLOCATE.
- */
-
-static int
-pmc_can_allocate_rowindex(struct proc *p, unsigned int ri)
-{
-	struct pmc_list *pl;
-	struct pmc_owner *po;
-	struct pmc_process *pp;
-
-	PMCDBG(PMC,ALR,1, "can-allocate-rowindex proc=%p (%d, %s) ri=%d",
-	    p, p->p_pid, p->p_comm, ri);
-
-	/* we shouldn't have allocated a PMC at row index 'ri' */
-	if ((po = pmc_find_owner_descriptor(p)) != NULL)
-		LIST_FOREACH(pl, &po->po_pmcs, pl_next)
-		    if (pl->pl_pmc->pm_rowindex == ri)
-			    return EEXIST;
-
-	/* we shouldn't be the target of any PMC ourselves at this index */
-	if ((pp = pmc_find_process_descriptor(p, 0)) != NULL)
-		if (pp->pp_pmcs[ri].pp_pmc)
-			return EEXIST;
-
-	PMCDBG(PMC,ALR,2, "can-allocate-rowindex proc=%p (%d, %s) ri=%d ok",
-	    p, p->p_pid, p->p_comm, ri);
-
-	return 0;
-}
-
-/*
- * Check if a given PMC at row index 'ri' can be currently used in
- * mode 'mode'.
- */
-
-static int
-pmc_can_allocate_row(int ri, enum pmc_mode mode)
-{
-	enum pmc_disp	disp;
-
-	sx_assert(&pmc_sx, SX_XLOCKED);
-
-	PMCDBG(PMC,ALR,1, "can-allocate-row ri=%d mode=%d", ri, mode);
-
-	if (PMC_IS_SYSTEM_MODE(mode))
-		disp = PMC_DISP_STANDALONE;
-	else
-		disp = PMC_DISP_THREAD;
-
-	/*
-	 * check disposition for PMC row 'ri':
-	 *
-	 * Expected disposition		Row-disposition		Result
-	 *
-	 * STANDALONE			STANDALONE or FREE	proceed
-	 * STANDALONE			THREAD			fail
-	 * THREAD			THREAD or FREE		proceed
-	 * THREAD			STANDALONE		fail
-	 */
-
-	if (!PMC_ROW_DISP_IS_FREE(ri) &&
-	    !(disp == PMC_DISP_THREAD && PMC_ROW_DISP_IS_THREAD(ri)) &&
-	    !(disp == PMC_DISP_STANDALONE && PMC_ROW_DISP_IS_STANDALONE(ri)))
-		return EBUSY;
-
-	/*
-	 * All OK
-	 */
-
-	PMCDBG(PMC,ALR,2, "can-allocate-row ri=%d mode=%d ok", ri, mode);
-
-	return 0;
-
-}
-
-/*
- * Find a PMC descriptor with user handle 'pmc' for thread 'td'.
- */
-
-static struct pmc *
-pmc_find_pmc_descriptor_in_process(struct pmc_owner *po, pmc_id_t pmcid)
-{
-	struct pmc_list	*pl;
-
-	KASSERT(pmcid < md->pmd_npmc,
-	    ("[pmc,%d] Illegal pmc index %d (max %d)", __LINE__, pmcid,
-		md->pmd_npmc));
-
-	LIST_FOREACH(pl, &po->po_pmcs, pl_next)
-	    if (pl->pl_pmc->pm_rowindex == pmcid)
-		    return pl->pl_pmc;
-
-	return NULL;
-}
-
-static int
-pmc_find_pmc(pmc_id_t pmcid, struct pmc **pmc)
-{
-
-	struct pmc *pm;
-	struct pmc_owner *po;
-
-	PMCDBG(PMC,FND,1, "find-pmc id=%d", pmcid);
-
-	if ((po = pmc_find_owner_descriptor(curthread->td_proc)) == NULL)
-		return ESRCH;
-
-	if ((pm = pmc_find_pmc_descriptor_in_process(po, pmcid)) == NULL)
-		return EINVAL;
-
-	PMCDBG(PMC,FND,2, "find-pmc id=%d -> pmc=%p", pmcid, pm);
-
-	*pmc = pm;
-	return 0;
-}
-
-/*
- * Start a PMC.
- */
-
-static int
-pmc_start(struct pmc *pm)
-{
-	int error, cpu, ri;
-	struct pmc_binding pb;
-
-	KASSERT(pm != NULL,
-	    ("[pmc,%d] null pm", __LINE__));
-
-	PMCDBG(PMC,OPS,1, "start pmc=%p mode=%d ri=%d", pm, pm->pm_mode,
-	    pm->pm_rowindex);
-
-	pm->pm_state = PMC_STATE_RUNNING;
-
-	if (PMC_IS_VIRTUAL_MODE(pm->pm_mode)) {
-
-		/*
-		 * If a PMCATTACH hadn't been done on this
-		 * PMC, attach this PMC to its owner process.
-		 */
-
-		if (LIST_EMPTY(&pm->pm_targets))
-			return pmc_attach_process(pm->pm_owner->po_owner, pm);
-
-
-		/*
-		 * Nothing further to be done; thread context switch code
-		 * will start/stop the PMC as appropriate.
-		 */
-
-		return 0;
-
-	}
-
-	/*
-	 * A system-mode PMC.  Move to the CPU associated with this
-	 * PMC, and start the hardware.
-	 */
-
-	pmc_save_cpu_binding(&pb);
-
-	cpu = pm->pm_gv.pm_cpu;
-
-	if (pmc_cpu_is_disabled(cpu))
-		return ENXIO;
-
-	ri  = pm->pm_rowindex;
-
-	pmc_select_cpu(cpu);
-
-	/*
-	 * global PMCs are configured at allocation time
-	 * so write out the initial value and start the PMC.
-	 */
-
-	if ((error = md->pmd_write_pmc(cpu, ri,
-		 PMC_IS_SAMPLING_MODE(pm->pm_mode) ?
-		 pm->pm_sc.pm_reloadcount :
-		 pm->pm_sc.pm_initial)) == 0)
-		error = md->pmd_start_pmc(cpu, ri);
-
-	pmc_restore_cpu_binding(&pb);
-
-	return error;
-}
-
-/*
- * Stop a PMC.
- */
-
-static int
-pmc_stop(struct pmc *pm)
-{
-	int error, cpu;
-	struct pmc_binding pb;
-
-	KASSERT(pm != NULL, ("[pmc,%d] null pmc", __LINE__));
-
-	PMCDBG(PMC,OPS,1, "stop pmc=%p mode=%d ri=%d", pm, pm->pm_mode,
-	    pm->pm_rowindex);
-
-	pm->pm_state = PMC_STATE_STOPPED;
-
-	/*
-	 * If the PMC is a virtual mode one, changing the state to
-	 * non-RUNNING is enough to ensure that the PMC never gets
-	 * scheduled.
-	 *
-	 * If this PMC is current running on a CPU, then it will
-	 * handled correctly at the time its target process is context
-	 * switched out.
-	 */
-
-	if (PMC_IS_VIRTUAL_MODE(pm->pm_mode))
-		return 0;
-
-	/*
-	 * A system-mode PMC.  Move to the CPU associated with
-	 * this PMC, and stop the hardware.  We update the
-	 * 'initial count' so that a subsequent PMCSTART will
-	 * resume counting from the current hardware count.
-	 */
-
-	pmc_save_cpu_binding(&pb);
-
-	cpu = pm->pm_gv.pm_cpu;
-
-	if (pmc_cpu_is_disabled(cpu))
-		return ENXIO;
-
-	pmc_select_cpu(cpu);
-
-	if ((error = md->pmd_stop_pmc(cpu, pm->pm_rowindex)) == 0)
-		error = md->pmd_read_pmc(cpu, pm->pm_rowindex,
-		    &pm->pm_sc.pm_initial);
-
-	pmc_restore_cpu_binding(&pb);
-
-	return error;
-}
-
-
-#if	DEBUG
-static const char *pmc_op_to_name[] = {
-#undef	__PMC_OP
-#define	__PMC_OP(N, D)	#N ,
-	__PMC_OPS()
-	NULL
-};
-#endif
-
-/*
- * The syscall interface
- */
-
-#define	PMC_GET_SX_XLOCK(...) do {		\
-	sx_xlock(&pmc_sx);			\
-	if (pmc_hook == NULL) {			\
-		sx_xunlock(&pmc_sx);		\
-		return __VA_ARGS__;		\
-	}					\
-} while (0)
-
-#define	PMC_DOWNGRADE_SX() do {			\
-	sx_downgrade(&pmc_sx);			\
-	is_sx_downgraded = 1;			\
-} while (0)
-
-static int
-pmc_syscall_handler(struct thread *td, void *syscall_args)
-{
-	int error, is_sx_downgraded, op;
-	struct pmc_syscall_args *c;
-	void *arg;
-
-	PMC_GET_SX_XLOCK(ENOSYS);
-
-	is_sx_downgraded = 0;
-
-	c = (struct pmc_syscall_args *) syscall_args;
-
-	op = c->pmop_code;
-	arg = c->pmop_data;
-
-	PMCDBG(MOD,PMS,1, "syscall op=%d \"%s\" arg=%p", op,
-	    pmc_op_to_name[op], arg);
-
-	error = 0;
-	atomic_add_int(&pmc_stats.pm_syscalls, 1);
-
-	switch(op)
-	{
-
-
-	/*
-	 * Configure a log file.
-	 *
-	 * XXX This OP will be reworked.
-	 */
-
-	case PMC_OP_CONFIGURELOG:
-	{
-		struct pmc_owner *po;
-		struct pmc_op_configurelog cl;
-		struct proc *p;
-
-		sx_assert(&pmc_sx, SX_XLOCKED);
-
-		if ((error = copyin(arg, &cl, sizeof(cl))) != 0)
-			break;
-
-		/* mark this process as owning a log file */
-		p = td->td_proc;
-		if ((po = pmc_find_owner_descriptor(p)) == NULL)
-			if ((po = pmc_allocate_owner_descriptor(p)) == NULL)
-				return ENOMEM;
-
-		if ((error = pmc_configure_log(po, cl.pm_logfd)) != 0)
-			break;
-
-	}
-	break;
-
-
-	/*
-	 * Retrieve hardware configuration.
-	 */
-
-	case PMC_OP_GETCPUINFO:	/* CPU information */
-	{
-		struct pmc_op_getcpuinfo gci;
-
-		gci.pm_cputype = md->pmd_cputype;
-		gci.pm_npmc    = md->pmd_npmc;
-		gci.pm_nclass  = md->pmd_nclass;
-		bcopy(md->pmd_classes, &gci.pm_classes,
-		    sizeof(gci.pm_classes));
-		gci.pm_ncpu    = mp_ncpus;
-		error = copyout(&gci, arg, sizeof(gci));
-	}
-	break;
-
-
-	/*
-	 * Get module statistics
-	 */
-
-	case PMC_OP_GETDRIVERSTATS:
-	{
-		struct pmc_op_getdriverstats gms;
-
-		bcopy(&pmc_stats, &gms, sizeof(gms));
-		error = copyout(&gms, arg, sizeof(gms));
-	}
-	break;
-
-
-	/*
-	 * Retrieve module version number
-	 */
-
-	case PMC_OP_GETMODULEVERSION:
-	{
-		error = copyout(&_pmc_version.mv_version, arg, sizeof(int));
-	}
-	break;
-
-
-	/*
-	 * Retrieve the state of all the PMCs on a given
-	 * CPU.
-	 */
-
-	case PMC_OP_GETPMCINFO:
-	{
-		uint32_t cpu, n, npmc;
-		size_t pmcinfo_size;
-		struct pmc *pm;
-		struct pmc_info *p, *pmcinfo;
-		struct pmc_op_getpmcinfo *gpi;
-		struct pmc_owner *po;
-		struct pmc_binding pb;
-
-		PMC_DOWNGRADE_SX();
-
-		gpi = (struct pmc_op_getpmcinfo *) arg;
-
-		if ((error = copyin(&gpi->pm_cpu, &cpu, sizeof(cpu))) != 0)
-			break;
-
-		if (cpu >= (unsigned int) mp_ncpus) {
-			error = EINVAL;
-			break;
-		}
-
-		if (pmc_cpu_is_disabled(cpu)) {
-			error = ENXIO;
-			break;
-		}
-
-		/* switch to CPU 'cpu' */
-		pmc_save_cpu_binding(&pb);
-		pmc_select_cpu(cpu);
-
-		npmc = md->pmd_npmc;
-
-		pmcinfo_size = npmc * sizeof(struct pmc_info);
-		MALLOC(pmcinfo, struct pmc_info *, pmcinfo_size, M_PMC,
-		    M_WAITOK);
-
-		p = pmcinfo;
-
-		for (n = 0; n < md->pmd_npmc; n++, p++) {
-
-			if ((error = md->pmd_describe(cpu, n, p, &pm)) != 0)
-				break;
-
-			if (PMC_ROW_DISP_IS_STANDALONE(n))
-				p->pm_rowdisp = PMC_DISP_STANDALONE;
-			else if (PMC_ROW_DISP_IS_THREAD(n))
-				p->pm_rowdisp = PMC_DISP_THREAD;
-			else
-				p->pm_rowdisp = PMC_DISP_FREE;
-
-			p->pm_ownerpid = -1;
-
-			if (pm == NULL)	/* no PMC associated */
-				continue;
-
-			po = pm->pm_owner;
-
-			KASSERT(po->po_owner != NULL,
-			    ("[pmc,%d] pmc_owner had a null proc pointer",
-				__LINE__));
-
-			p->pm_ownerpid = po->po_owner->p_pid;
-			p->pm_mode     = pm->pm_mode;
-			p->pm_event    = pm->pm_event;
-			p->pm_flags    = pm->pm_flags;
-
-			if (PMC_IS_SAMPLING_MODE(pm->pm_mode))
-				p->pm_reloadcount =
-				    pm->pm_sc.pm_reloadcount;
-		}
-
-		pmc_restore_cpu_binding(&pb);
-
-		/* now copy out the PMC info collected */
-		if (error == 0)
-			error = copyout(pmcinfo, &gpi->pm_pmcs, pmcinfo_size);
-
-		FREE(pmcinfo, M_PMC);
-	}
-	break;
-
-
-	/*
-	 * Set the administrative state of a PMC.  I.e. whether
-	 * the PMC is to be used or not.
-	 */
-
-	case PMC_OP_PMCADMIN:
-	{
-		int cpu, ri;
-		enum pmc_state request;
-		struct pmc_cpu *pc;
-		struct pmc_hw *phw;
-		struct pmc_op_pmcadmin pma;
-		struct pmc_binding pb;
-
-		sx_assert(&pmc_sx, SX_XLOCKED);
-
-		KASSERT(td == curthread,
-		    ("[pmc,%d] td != curthread", __LINE__));
-
-		if (suser(td) || jailed(td->td_ucred)) {
-			error =  EPERM;
-			break;
-		}
-
-		if ((error = copyin(arg, &pma, sizeof(pma))) != 0)
-			break;
-
-		cpu = pma.pm_cpu;
-
-		if (cpu < 0 || cpu >= mp_ncpus) {
-			error = EINVAL;
-			break;
-		}
-
-		if (pmc_cpu_is_disabled(cpu)) {
-			error = ENXIO;
-			break;
-		}
-
-		request = pma.pm_state;
-
-		if (request != PMC_STATE_DISABLED &&
-		    request != PMC_STATE_FREE) {
-			error = EINVAL;
-			break;
-		}
-
-		ri = pma.pm_pmc; /* pmc id == row index */
-		if (ri < 0 || ri >= (int) md->pmd_npmc) {
-			error = EINVAL;
-			break;
-		}
-
-		/*
-		 * We can't disable a PMC with a row-index allocated
-		 * for process virtual PMCs.
-		 */
-
-		if (PMC_ROW_DISP_IS_THREAD(ri) &&
-		    request == PMC_STATE_DISABLED) {
-			error = EBUSY;
-			break;
-		}
-
-		/*
-		 * otherwise, this PMC on this CPU is either free or
-		 * in system-wide mode.
-		 */
-
-		pmc_save_cpu_binding(&pb);
-		pmc_select_cpu(cpu);
-
-		pc  = pmc_pcpu[cpu];
-		phw = pc->pc_hwpmcs[ri];
-
-		/*
-		 * XXX do we need some kind of 'forced' disable?
-		 */
-
-		if (phw->phw_pmc == NULL) {
-			if (request == PMC_STATE_DISABLED &&
-			    (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED)) {
-				phw->phw_state &= ~PMC_PHW_FLAG_IS_ENABLED;
-				PMC_MARK_ROW_STANDALONE(ri);
-			} else if (request == PMC_STATE_FREE &&
-			    (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) == 0) {
-				phw->phw_state |=  PMC_PHW_FLAG_IS_ENABLED;
-				PMC_UNMARK_ROW_STANDALONE(ri);
-			}
-			/* other cases are a no-op */
-		} else
-			error = EBUSY;
-
-		pmc_restore_cpu_binding(&pb);
-	}
-	break;
-
-
-	/*
-	 * Allocate a PMC.
-	 */
-
-	case PMC_OP_PMCALLOCATE:
-	{
-		uint32_t caps;
-		u_int cpu;
-		int n;
-		enum pmc_mode mode;
-		struct pmc *pmc;
-		struct pmc_op_pmcallocate pa;
-		struct pmc_binding pb;
-
-		if ((error = copyin(arg, &pa, sizeof(pa))) != 0)
-			break;
-
-		caps = pa.pm_caps;
-		mode = pa.pm_mode;
-		cpu  = pa.pm_cpu;
-
-		if ((mode != PMC_MODE_SS  &&  mode != PMC_MODE_SC  &&
-		     mode != PMC_MODE_TS  &&  mode != PMC_MODE_TC) ||
-		    (cpu != (u_int) PMC_CPU_ANY && cpu >= (u_int) mp_ncpus)) {
-			error = EINVAL;
-			break;
-		}
-
-		/*
-		 * Virtual PMCs should only ask for a default CPU.
-		 * System mode PMCs need to specify a non-default CPU.
-		 */
-
-		if ((PMC_IS_VIRTUAL_MODE(mode) && cpu != (u_int) PMC_CPU_ANY) ||
-		    (PMC_IS_SYSTEM_MODE(mode) && cpu == (u_int) PMC_CPU_ANY)) {
-			error = EINVAL;
-			break;
-		}
-
-		/*
-		 * Check that a disabled CPU is not being asked for.
-		 */
-
-		if (PMC_IS_SYSTEM_MODE(mode) && pmc_cpu_is_disabled(cpu)) {
-			error = ENXIO;
-			break;
-		}
-
-		/*
-		 * Refuse an allocation for a system-wide PMC if this
-		 * process has been jailed, or if this process lacks
-		 * super-user credentials and the sysctl tunable
-		 * 'security.bsd.unprivileged_syspmcs' is zero.
-		 */
-
-		if (PMC_IS_SYSTEM_MODE(mode)) {
-			if (jailed(curthread->td_ucred))
-				error = EPERM;
-			else if (suser(curthread) &&
-			    (pmc_unprivileged_syspmcs == 0))
-				error = EPERM;
-		}
-
-		if (error)
-			break;
-
-		/*
-		 * Look for valid values for 'pm_flags'
-		 */
-
-		if ((pa.pm_flags & ~(PMC_F_DESCENDANTS|PMC_F_LOG_TC_CSW))
-		    != 0) {
-			error = EINVAL;
-			break;
-		}
-
-		/*
-		 * All sampling mode PMCs need to be able to interrupt the
-		 * CPU.
-		 */
-
-		if (PMC_IS_SAMPLING_MODE(mode)) {
-			caps |= PMC_CAP_INTERRUPT;
-			error = ENOSYS; /* for snapshot 6 */
-			break;
-		}
-
-		PMCDBG(PMC,ALL,2, "event=%d caps=0x%x mode=%d cpu=%d",
-		    pa.pm_ev, caps, mode, cpu);
-
-		pmc = pmc_allocate_pmc_descriptor();
-		pmc->pm_event = pa.pm_ev;
-		pmc->pm_class = pa.pm_class;
-		pmc->pm_state = PMC_STATE_FREE;
-		pmc->pm_mode  = mode;
-		pmc->pm_caps  = caps;
-		pmc->pm_flags = pa.pm_flags;
-
-		/* switch thread to CPU 'cpu' */
-		pmc_save_cpu_binding(&pb);
-
-#define	PMC_IS_SHAREABLE_PMC(cpu, n)				\
-	(pmc_pcpu[(cpu)]->pc_hwpmcs[(n)]->phw_state &		\
-	 PMC_PHW_FLAG_IS_SHAREABLE)
-#define	PMC_IS_UNALLOCATED(cpu, n)				\
-	(pmc_pcpu[(cpu)]->pc_hwpmcs[(n)]->phw_pmc == NULL)
-
-		if (PMC_IS_SYSTEM_MODE(mode)) {
-			pmc_select_cpu(cpu);
-			for (n = 0; n < (int) md->pmd_npmc; n++)
-				if (pmc_can_allocate_row(n, mode) == 0 &&
-				    pmc_can_allocate_rowindex(
-					    curthread->td_proc, n) == 0 &&
-				    (PMC_IS_UNALLOCATED(cpu, n) ||
-				     PMC_IS_SHAREABLE_PMC(cpu, n)) &&
-				    md->pmd_allocate_pmc(cpu, n, pmc,
-					&pa) == 0)
-					break;
-		} else {
-			/* Process virtual mode */
-			for (n = 0; n < (int) md->pmd_npmc; n++) {
-				if (pmc_can_allocate_row(n, mode) == 0 &&
-				    pmc_can_allocate_rowindex(
-					    curthread->td_proc, n) == 0 &&
-				    md->pmd_allocate_pmc(curthread->td_oncpu,
-					n, pmc, &pa) == 0)
-					break;
-			}
-		}
-
-#undef	PMC_IS_UNALLOCATED
-#undef	PMC_IS_SHAREABLE_PMC
-
-		pmc_restore_cpu_binding(&pb);
-
-		if (n == (int) md->pmd_npmc) {
-			pmc_destroy_pmc_descriptor(pmc);
-			FREE(pmc, M_PMC);
-			pmc = NULL;
-			error = EINVAL;
-			break;
-		}
-
-		PMCDBG(PMC,ALL,2, "ev=%d class=%d mode=%d -> n=%d",
-		    pmc->pm_event, pmc->pm_class, pmc->pm_mode, n);
-
-		/*
-		 * Configure global pmc's immediately
-		 */
-
-		if (PMC_IS_SYSTEM_MODE(pmc->pm_mode))
-			if ((error = md->pmd_config_pmc(cpu, n, pmc)) != 0) {
-				(void) md->pmd_release_pmc(cpu, n, pmc);
-				pmc_destroy_pmc_descriptor(pmc);
-				FREE(pmc, M_PMC);
-				pmc = NULL;
-				break;
-			}
-
-		/*
-		 * Mark the row index allocated.
-		 */
-
-		pmc->pm_rowindex = n;
-		pmc->pm_state    = PMC_STATE_ALLOCATED;
-
-		/*
-		 * mark row disposition
-		 */
-
-		if (PMC_IS_SYSTEM_MODE(mode))
-			PMC_MARK_ROW_STANDALONE(n);
-		else
-			PMC_MARK_ROW_THREAD(n);
-
-		/*
-		 * If this is a system-wide CPU, mark the CPU it
-		 * was allocated on.
-		 */
-
-		if (PMC_IS_SYSTEM_MODE(mode))
-			pmc->pm_gv.pm_cpu = cpu;
-
-		/*
-		 * Register this PMC with the current thread as its owner.
-		 */
-
-		if ((error =
-		    pmc_register_owner(curthread->td_proc, pmc)) != 0) {
-			pmc_release_pmc_descriptor(pmc);
-			FREE(pmc, M_PMC);
-			pmc = NULL;
-			break;
-		}
-
-		/*
-		 * Return the allocated index.
-		 */
-
-		pa.pm_pmcid = n;
-
-		error = copyout(&pa, arg, sizeof(pa));
-	}
-	break;
-
-
-	/*
-	 * Attach a PMC to a process.
-	 */
-
-	case PMC_OP_PMCATTACH:
-	{
-		struct pmc *pm;
-		struct proc *p;
-		struct pmc_op_pmcattach a;
-
-		sx_assert(&pmc_sx, SX_XLOCKED);
-
-		if ((error = copyin(arg, &a, sizeof(a))) != 0)
-			break;
-
-		if (a.pm_pid < 0) {
-			error = EINVAL;
-			break;
-		} else if (a.pm_pid == 0)
-			a.pm_pid = td->td_proc->p_pid;
-
-		if ((error = pmc_find_pmc(a.pm_pmc, &pm)) != 0)
-			break;
-
-		if (PMC_IS_SYSTEM_MODE(pm->pm_mode)) {
-			error = EINVAL;
-			break;
-		}
-
-		/* PMCs may be (re)attached only when allocated or stopped */
-		if (pm->pm_state == PMC_STATE_RUNNING) {
-			error = EBUSY;
-			break;
-		} else if (pm->pm_state != PMC_STATE_ALLOCATED &&
-		    pm->pm_state != PMC_STATE_STOPPED) {
-			error = EINVAL;
-			break;
-		}
-
-		/* lookup pid */
-		if ((p = pfind(a.pm_pid)) == NULL) {
-			error = ESRCH;
-			break;
-		}
-
-		/*
-		 * Ignore processes that are working on exiting.
-		 */
-		if (p->p_flag & P_WEXIT) {
-			error = ESRCH;
-			PROC_UNLOCK(p);	/* pfind() returns a locked process */
-			break;
-		}
-
-		/*
-		 * we are allowed to attach a PMC to a process if
-		 * we can debug it.
-		 */
-		error = p_candebug(curthread, p);
-
-		PROC_UNLOCK(p);
-
-		if (error == 0)
-			error = pmc_attach_process(p, pm);
-	}
-	break;
-
-
-	/*
-	 * Detach an attached PMC from a process.
-	 */
-
-	case PMC_OP_PMCDETACH:
-	{
-		struct pmc *pm;
-		struct proc *p;
-		struct pmc_op_pmcattach a;
-
-		if ((error = copyin(arg, &a, sizeof(a))) != 0)
-			break;
-
-		if (a.pm_pid < 0) {
-			error = EINVAL;
-			break;
-		} else if (a.pm_pid == 0)
-			a.pm_pid = td->td_proc->p_pid;
-
-		if ((error = pmc_find_pmc(a.pm_pmc, &pm)) != 0)
-			break;
-
-		if ((p = pfind(a.pm_pid)) == NULL) {
-			error = ESRCH;
-			break;
-		}
-
-		/*
-		 * Treat processes that are in the process of exiting
-		 * as if they were not present.
-		 */
-
-		if (p->p_flag & P_WEXIT)
-			error = ESRCH;
-
-		PROC_UNLOCK(p);	/* pfind() returns a locked process */
-
-		if (error == 0)
-			error = pmc_detach_process(p, pm);
-	}
-	break;
-
-
-	/*
-	 * Release an allocated PMC
-	 */
-
-	case PMC_OP_PMCRELEASE:
-	{
-		pmc_id_t pmcid;
-		struct pmc *pm;
-		struct pmc_owner *po;
-		struct pmc_op_simple sp;
-
-		/*
-		 * Find PMC pointer for the named PMC.
-		 *
-		 * Use pmc_release_pmc_descriptor() to switch off the
-		 * PMC, remove all its target threads, and remove the
-		 * PMC from its owner's list.
-		 *
-		 * Remove the owner record if this is the last PMC
-		 * owned.
-		 *
-		 * Free up space.
-		 */
-
-		if ((error = copyin(arg, &sp, sizeof(sp))) != 0)
-			break;
-
-		pmcid = sp.pm_pmcid;
-
-		if ((error = pmc_find_pmc(pmcid, &pm)) != 0)
-			break;
-
-		po = pm->pm_owner;
-		pmc_release_pmc_descriptor(pm);
-		pmc_maybe_remove_owner(po);
-
-		FREE(pm, M_PMC);
-	}
-	break;
-
-
-	/*
-	 * Read and/or write a PMC.
-	 */
-
-	case PMC_OP_PMCRW:
-	{
-		uint32_t cpu, ri;
-		struct pmc *pm;
-		struct pmc_op_pmcrw *pprw;
-		struct pmc_op_pmcrw prw;
-		struct pmc_binding pb;
-		pmc_value_t oldvalue;
-
-		PMC_DOWNGRADE_SX();
-
-		if ((error = copyin(arg, &prw, sizeof(prw))) != 0)
-			break;
-
-		ri = 0;
-		PMCDBG(PMC,OPS,1, "rw id=%d flags=0x%x", prw.pm_pmcid,
-		    prw.pm_flags);
-
-		/* must have at least one flag set */
-		if ((prw.pm_flags & (PMC_F_OLDVALUE|PMC_F_NEWVALUE)) == 0) {
-			error = EINVAL;
-			break;
-		}
-
-		/* locate pmc descriptor */
-		if ((error = pmc_find_pmc(prw.pm_pmcid, &pm)) != 0)
-			break;
-
-		/* Can't read a PMC that hasn't been started. */
-		if (pm->pm_state != PMC_STATE_ALLOCATED &&
-		    pm->pm_state != PMC_STATE_STOPPED &&
-		    pm->pm_state != PMC_STATE_RUNNING) {
-			error = EINVAL;
-			break;
-		}
-
-		/* writing a new value is allowed only for 'STOPPED' pmcs */
-		if (pm->pm_state == PMC_STATE_RUNNING &&
-		    (prw.pm_flags & PMC_F_NEWVALUE)) {
-			error = EBUSY;
-			break;
-		}
-
-		if (PMC_IS_VIRTUAL_MODE(pm->pm_mode)) {
-
-			/* read/write the saved value in the PMC record */
-			mtx_pool_lock_spin(pmc_mtxpool, pm);
-			if (prw.pm_flags & PMC_F_OLDVALUE)
-				oldvalue = pm->pm_gv.pm_savedvalue;
-			if (prw.pm_flags & PMC_F_NEWVALUE)
-				pm->pm_gv.pm_savedvalue = prw.pm_value;
-			mtx_pool_unlock_spin(pmc_mtxpool, pm);
-
-		} else { /* System mode PMCs */
-			cpu = pm->pm_gv.pm_cpu;
-			ri  = pm->pm_rowindex;
-
-			if (pmc_cpu_is_disabled(cpu)) {
-				error = ENXIO;
-				break;
-			}
-
-			/* move this thread to CPU 'cpu' */
-			pmc_save_cpu_binding(&pb);
-			pmc_select_cpu(cpu);
-
-			/* save old value */
-			if (prw.pm_flags & PMC_F_OLDVALUE)
-				if ((error = (*md->pmd_read_pmc)(cpu, ri,
-					 &oldvalue)))
-					goto error;
-			/* write out new value */
-			if (prw.pm_flags & PMC_F_NEWVALUE)
-				error = (*md->pmd_write_pmc)(cpu, ri,
-				    prw.pm_value);
-		error:
-			pmc_restore_cpu_binding(&pb);
-			if (error)
-				break;
-		}
-
-		pprw = (struct pmc_op_pmcrw *) arg;
-
-#if	DEBUG
-		if (prw.pm_flags & PMC_F_NEWVALUE)
-			PMCDBG(PMC,OPS,2, "rw id=%d new %jx -> old %jx",
-			    ri, prw.pm_value, oldvalue);
-		else
-			PMCDBG(PMC,OPS,2, "rw id=%d -> old %jx", ri, oldvalue);
-#endif
-
-		/* return old value if requested */
-		if (prw.pm_flags & PMC_F_OLDVALUE)
-			if ((error = copyout(&oldvalue, &pprw->pm_value,
-				 sizeof(prw.pm_value))))
-				break;
-
-		/*
-		 * send a signal (SIGIO) to the owner if it is trying to read
-		 * a PMC with no target processes attached.
-		 */
-
-		if (LIST_EMPTY(&pm->pm_targets) &&
-		    (prw.pm_flags & PMC_F_OLDVALUE)) {
-			PROC_LOCK(curthread->td_proc);
-			psignal(curthread->td_proc, SIGIO);
-			PROC_UNLOCK(curthread->td_proc);
-		}
-	}
-	break;
-
-
-	/*
-	 * Set the sampling rate for a sampling mode PMC and the
-	 * initial count for a counting mode PMC.
-	 */
-
-	case PMC_OP_PMCSETCOUNT:
-	{
-		struct pmc *pm;
-		struct pmc_op_pmcsetcount sc;
-
-		PMC_DOWNGRADE_SX();
-
-		if ((error = copyin(arg, &sc, sizeof(sc))) != 0)
-			break;
-
-		if ((error = pmc_find_pmc(sc.pm_pmcid, &pm)) != 0)
-			break;
-
-		if (pm->pm_state == PMC_STATE_RUNNING) {
-			error = EBUSY;
-			break;
-		}
-
-		if (PMC_IS_SAMPLING_MODE(pm->pm_mode))
-			pm->pm_sc.pm_reloadcount = sc.pm_count;
-		else
-			pm->pm_sc.pm_initial = sc.pm_count;
-	}
-	break;
-
-
-	/*
-	 * Start a PMC.
-	 */
-
-	case PMC_OP_PMCSTART:
-	{
-		pmc_id_t pmcid;
-		struct pmc *pm;
-		struct pmc_op_simple sp;
-
-		sx_assert(&pmc_sx, SX_XLOCKED);
-
-		if ((error = copyin(arg, &sp, sizeof(sp))) != 0)
-			break;
-
-		pmcid = sp.pm_pmcid;
-
-		if ((error = pmc_find_pmc(pmcid, &pm)) != 0)
-			break;
-
-		KASSERT(pmcid == pm->pm_rowindex,
-		    ("[pmc,%d] row index %d != id %d", __LINE__,
-			pm->pm_rowindex, pmcid));
-
-		if (pm->pm_state == PMC_STATE_RUNNING) /* already running */
-			break;
-		else if (pm->pm_state != PMC_STATE_STOPPED &&
-		    pm->pm_state != PMC_STATE_ALLOCATED) {
-			error = EINVAL;
-			break;
-		}
-
-		error = pmc_start(pm);
-	}
-	break;
-
-
-	/*
-	 * Stop a PMC.
-	 */
-
-	case PMC_OP_PMCSTOP:
-	{
-		pmc_id_t pmcid;
-		struct pmc *pm;
-		struct pmc_op_simple sp;
-
-		PMC_DOWNGRADE_SX();
-
-		if ((error = copyin(arg, &sp, sizeof(sp))) != 0)
-			break;
-
-		pmcid = sp.pm_pmcid;
-
-		/*
-		 * Mark the PMC as inactive and invoke the MD stop
-		 * routines if needed.
-		 */
-
-		if ((error = pmc_find_pmc(pmcid, &pm)) != 0)
-			break;
-
-		KASSERT(pmcid == pm->pm_rowindex,
-		    ("[pmc,%d] row index %d != pmcid %d", __LINE__,
-			pm->pm_rowindex, pmcid));
-
-		if (pm->pm_state == PMC_STATE_STOPPED) /* already stopped */
-			break;
-		else if (pm->pm_state != PMC_STATE_RUNNING) {
-			error = EINVAL;
-			break;
-		}
-
-		error = pmc_stop(pm);
-	}
-	break;
-
-
-	/*
-	 * Write a user-entry to the log file.
-	 */
-
-	case PMC_OP_WRITELOG:
-	{
-
-		PMC_DOWNGRADE_SX();
-
-		/*
-		 * flush all per-cpu hash tables
-		 * append user-log entry
-		 */
-
-		error = ENOSYS;
-	}
-	break;
-
-
-#if __i386__ || __amd64__
-
-	/*
-	 * Machine dependent operation for i386-class processors.
-	 *
-	 * Retrieve the MSR number associated with the counter
-	 * 'pmc_id'.  This allows processes to directly use RDPMC
-	 * instructions to read their PMCs, without the overhead of a
-	 * system call.
-	 */
-
-	case PMC_OP_PMCX86GETMSR:
-	{
-		int ri;
-		struct pmc	*pm;
-		struct pmc_op_x86_getmsr gm;
-
-		PMC_DOWNGRADE_SX();
-
-		/* CPU has no 'GETMSR' support */
-		if (md->pmd_get_msr == NULL) {
-			error = ENOSYS;
-			break;
-		}
-
-		if ((error = copyin(arg, &gm, sizeof(gm))) != 0)
-			break;
-
-		if ((error = pmc_find_pmc(gm.pm_pmcid, &pm)) != 0)
-			break;
-
-		/*
-		 * The allocated PMC needs to be a process virtual PMC,
-		 * i.e., of type T[CS].
-		 *
-		 * Global PMCs can only be read using the PMCREAD
-		 * operation since they may be allocated on a
-		 * different CPU than the one we could be running on
-		 * at the time of the read.
-		 */
-
-		if (!PMC_IS_VIRTUAL_MODE(pm->pm_mode)) {
-			error = EINVAL;
-			break;
-		}
-
-		ri = pm->pm_rowindex;
-
-		if ((error = (*md->pmd_get_msr)(ri, &gm.pm_msr)) < 0)
-			break;
-		if ((error = copyout(&gm, arg, sizeof(gm))) < 0)
-			break;
-	}
-	break;
-#endif
-
-	default:
-		error = EINVAL;
-		break;
-	}
-
-	if (is_sx_downgraded)
-		sx_sunlock(&pmc_sx);
-	else
-		sx_xunlock(&pmc_sx);
-
-	if (error)
-		atomic_add_int(&pmc_stats.pm_syscall_errors, 1);
-
-	return error;
-}
-
-/*
- * Helper functions
- */
-
-/*
- * Configure a log file.
- */
-
-static int
-pmc_configure_log(struct pmc_owner *po, int logfd)
-{
-	struct proc *p;
-
-	return ENOSYS; /* for now */
-
-	p = po->po_owner;
-
-	if (po->po_logfd < 0 && logfd < 0) /* nothing to do */
-		return 0;
-
-	if (po->po_logfd >= 0 && logfd < 0) {
-		/* deconfigure log */
-		/* XXX */
-		po->po_flags &= ~PMC_FLAG_OWNS_LOGFILE;
-		pmc_maybe_remove_owner(po);
-
-	} else if (po->po_logfd < 0 && logfd >= 0) {
-		/* configure log file */
-		/* XXX */
-		po->po_flags |= PMC_FLAG_OWNS_LOGFILE;
-
-		/* mark process as using HWPMCs */
-		PROC_LOCK(p);
-		p->p_flag |= P_HWPMC;
-		PROC_UNLOCK(p);
-	} else
-		return EBUSY;
-
-	return 0;
-}
-
-/*
- * Log an exit event to the PMC owner's log file.
- */
-
-static void
-pmc_log_process_exit(struct pmc *pm, struct pmc_process *pp)
-{
-	KASSERT(pm->pm_flags & PMC_F_LOG_TC_PROCEXIT,
-	    ("[pmc,%d] log-process-exit called gratuitously", __LINE__));
-
-	(void) pm;
-	(void) pp;
-
-	return;
-}
-
-/*
- * Event handlers.
- */
-
-/*
- * Handle a process exit.
- *
- * XXX This eventhandler gets called early in the exit process.
- * Consider using a 'hook' invocation from thread_exit() or equivalent
- * spot.  Another negative is that kse_exit doesn't seem to call
- * exit1() [??].
- */
-
-static void
-pmc_process_exit(void *arg __unused, struct proc *p)
-{
-	int is_using_hwpmcs;
-
-	PROC_LOCK(p);
-	is_using_hwpmcs = p->p_flag & P_HWPMC;
-	PROC_UNLOCK(p);
-
-	if (is_using_hwpmcs) {
-		PMCDBG(PRC,EXT,1,"process-exit proc=%p (%d, %s)", p, p->p_pid,
-		    p->p_comm);
-
-		PMC_GET_SX_XLOCK();
-		(void) pmc_hook_handler(curthread, PMC_FN_PROCESS_EXIT,
-		    (void *) p);
-		sx_xunlock(&pmc_sx);
-	}
-}
-
-/*
- * Handle a process fork.
- *
- * If the parent process 'p1' is under HWPMC monitoring, then copy
- * over any attached PMCs that have 'do_descendants' semantics.
- */
-
-static void
-pmc_process_fork(void *arg __unused, struct proc *p1, struct proc *p2,
-    int flags)
-{
-	int is_using_hwpmcs;
-
-	(void) flags;		/* unused parameter */
-
-	PROC_LOCK(p1);
-	is_using_hwpmcs = p1->p_flag & P_HWPMC;
-	PROC_UNLOCK(p1);
-
-	if (is_using_hwpmcs) {
-		PMCDBG(PMC,FRK,1, "process-fork proc=%p (%d, %s)", p1,
-		    p1->p_pid, p1->p_comm);
-		PMC_GET_SX_XLOCK();
-		(void) pmc_hook_handler(curthread, PMC_FN_PROCESS_FORK,
-		    (void *) p2);
-		sx_xunlock(&pmc_sx);
-	}
-}
-
-
-/*
- * initialization
- */
-
-static const char *pmc_name_of_pmcclass[] = {
-#undef	__PMC_CLASS
-#define	__PMC_CLASS(N) #N ,
-	__PMC_CLASSES()
-};
-
-static int
-pmc_initialize(void)
-{
-	int error, cpu, n;
-	struct pmc_binding pb;
-
-	md = NULL;
-	error = 0;
-
-#if	DEBUG
-	/* parse debug flags first */
-	if (TUNABLE_STR_FETCH(PMC_SYSCTL_NAME_PREFIX "debugflags",
-		pmc_debugstr, sizeof(pmc_debugstr)))
-		pmc_debugflags_parse(pmc_debugstr,
-		    pmc_debugstr+strlen(pmc_debugstr));
-#endif
-
-	PMCDBG(MOD,INI,0, "PMC Initialize (version %x)", PMC_VERSION);
-
-	/*
-	 * check sysctl parameters
-	 */
-
-	if (pmc_hashsize <= 0) {
-		(void) printf("pmc: sysctl variable \""
-		    PMC_SYSCTL_NAME_PREFIX "hashsize\" must be greater than "
-		    "zero\n");
-		pmc_hashsize = PMC_HASH_SIZE;
-	}
-
-#if	defined(__i386__)
-	/* determine the CPU kind.  This is i386 specific */
-	if (strcmp(cpu_vendor, "AuthenticAMD") == 0)
-		md = pmc_amd_initialize();
-	else if (strcmp(cpu_vendor, "GenuineIntel") == 0)
-		md = pmc_intel_initialize();
-	/* XXX: what about the other i386 CPU manufacturers? */
-#elif	defined(__amd64__)
-	if (strcmp(cpu_vendor, "AuthenticAMD") == 0)
-		md = pmc_amd_initialize();
-#else  /* other architectures */
-	md = NULL;
-#endif
-
-	if (md == NULL || md->pmd_init == NULL)
-		return ENOSYS;
-
-	/* allocate space for the per-cpu array */
-	MALLOC(pmc_pcpu, struct pmc_cpu **, mp_ncpus * sizeof(struct pmc_cpu *),
-	    M_PMC, M_WAITOK|M_ZERO);
-
-	/* per-cpu 'saved values' for managing process-mode PMCs */
-	MALLOC(pmc_pcpu_saved, pmc_value_t *,
-	    sizeof(pmc_value_t) * mp_ncpus * md->pmd_npmc, M_PMC, M_WAITOK);
-
-	/* perform cpu dependent initialization */
-	pmc_save_cpu_binding(&pb);
-	for (cpu = 0; cpu < mp_ncpus; cpu++) {
-		if (pmc_cpu_is_disabled(cpu))
-			continue;
-		pmc_select_cpu(cpu);
-		if ((error = md->pmd_init(cpu)) != 0)
-			break;
-	}
-	pmc_restore_cpu_binding(&pb);
-
-	if (error != 0)
-		return error;
-
-	/* allocate space for the row disposition array */
-	pmc_pmcdisp = malloc(sizeof(enum pmc_mode) * md->pmd_npmc,
-	    M_PMC, M_WAITOK|M_ZERO);
-
-	KASSERT(pmc_pmcdisp != NULL,
-	    ("[pmc,%d] pmcdisp allocation returned NULL", __LINE__));
-
-	/* mark all PMCs as available */
-	for (n = 0; n < (int) md->pmd_npmc; n++)
-		PMC_MARK_ROW_FREE(n);
-
-	/* allocate thread hash tables */
-	pmc_ownerhash = hashinit(pmc_hashsize, M_PMC,
-	    &pmc_ownerhashmask);
-
-	pmc_processhash = hashinit(pmc_hashsize, M_PMC,
-	    &pmc_processhashmask);
-	mtx_init(&pmc_processhash_mtx, "pmc-process-hash", "pmc", MTX_SPIN);
-
-	/* allocate a pool of spin mutexes */
-	pmc_mtxpool = mtx_pool_create("pmc", pmc_mtxpool_size, MTX_SPIN);
-
-	PMCDBG(MOD,INI,1, "pmc_ownerhash=%p, mask=0x%lx "
-	    "targethash=%p mask=0x%lx", pmc_ownerhash, pmc_ownerhashmask,
-	    pmc_processhash, pmc_processhashmask);
-
-	/* register process {exit,fork,exec} handlers */
-	pmc_exit_tag = EVENTHANDLER_REGISTER(process_exit,
-	    pmc_process_exit, NULL, EVENTHANDLER_PRI_ANY);
-	pmc_fork_tag = EVENTHANDLER_REGISTER(process_fork,
-	    pmc_process_fork, NULL, EVENTHANDLER_PRI_ANY);
-
-	/* set hook functions */
-	pmc_intr = md->pmd_intr;
-	pmc_hook = pmc_hook_handler;
-
-	if (error == 0) {
-		printf(PMC_MODULE_NAME ":");
-		for (n = 0; n < (int) md->pmd_nclass; n++)
-			printf(" %s(%d)",
-			    pmc_name_of_pmcclass[md->pmd_classes[n]],
-			    md->pmd_nclasspmcs[n]);
-		printf("\n");
-	}
-
-	return error;
-}
-
-/* prepare to be unloaded */
-static void
-pmc_cleanup(void)
-{
-	int cpu;
-	struct pmc_ownerhash *ph;
-	struct pmc_owner *po, *tmp;
-	struct pmc_binding pb;
-#if	DEBUG
-	struct pmc_processhash *prh;
-#endif
-
-	PMCDBG(MOD,INI,0, "%s", "cleanup");
-
-	pmc_intr = NULL;	/* no more interrupts please */
-
-	sx_xlock(&pmc_sx);
-	if (pmc_hook == NULL) {	/* being unloaded already */
-		sx_xunlock(&pmc_sx);
-		return;
-	}
-
-	pmc_hook = NULL; /* prevent new threads from entering module */
-
-	/* deregister event handlers */
-	EVENTHANDLER_DEREGISTER(process_fork, pmc_fork_tag);
-	EVENTHANDLER_DEREGISTER(process_exit, pmc_exit_tag);
-
-	/* send SIGBUS to all owner threads, free up allocations */
-	if (pmc_ownerhash)
-		for (ph = pmc_ownerhash;
-		     ph <= &pmc_ownerhash[pmc_ownerhashmask];
-		     ph++) {
-			LIST_FOREACH_SAFE(po, ph, po_next, tmp) {
-				pmc_remove_owner(po);
-
-				/* send SIGBUS to owner processes */
-				PMCDBG(MOD,INI,2, "cleanup signal proc=%p "
-				    "(%d, %s)", po->po_owner,
-				    po->po_owner->p_pid,
-				    po->po_owner->p_comm);
-
-				PROC_LOCK(po->po_owner);
-				psignal(po->po_owner, SIGBUS);
-				PROC_UNLOCK(po->po_owner);
-				FREE(po, M_PMC);
-			}
-		}
-
-	/* reclaim allocated data structures */
-	if (pmc_mtxpool)
-		mtx_pool_destroy(&pmc_mtxpool);
-
-	mtx_destroy(&pmc_processhash_mtx);
-	if (pmc_processhash) {
-#if	DEBUG
-		struct pmc_process *pp;
-
-		PMCDBG(MOD,INI,3, "%s", "destroy process hash");
-		for (prh = pmc_processhash;
-		     prh <= &pmc_processhash[pmc_processhashmask];
-		     prh++)
-			LIST_FOREACH(pp, prh, pp_next)
-			    PMCDBG(MOD,INI,3, "pid=%d", pp->pp_proc->p_pid);
-#endif
-
-		hashdestroy(pmc_processhash, M_PMC, pmc_processhashmask);
-		pmc_processhash = NULL;
-	}
-
-	if (pmc_ownerhash) {
-		PMCDBG(MOD,INI,3, "%s", "destroy owner hash");
-		hashdestroy(pmc_ownerhash, M_PMC, pmc_ownerhashmask);
-		pmc_ownerhash = NULL;
-	}
-
- 	/* do processor dependent cleanup */
-	PMCDBG(MOD,INI,3, "%s", "md cleanup");
-	if (md) {
-		pmc_save_cpu_binding(&pb);
-		for (cpu = 0; cpu < mp_ncpus; cpu++) {
-			PMCDBG(MOD,INI,1,"pmc-cleanup cpu=%d pcs=%p",
-			    cpu, pmc_pcpu[cpu]);
-			if (pmc_cpu_is_disabled(cpu))
-				continue;
-			pmc_select_cpu(cpu);
-			if (pmc_pcpu[cpu])
-				(void) md->pmd_cleanup(cpu);
-		}
-		FREE(md, M_PMC);
-		md = NULL;
-		pmc_restore_cpu_binding(&pb);
-	}
-
-	/* deallocate per-cpu structures */
-	FREE(pmc_pcpu, M_PMC);
-	pmc_pcpu = NULL;
-
-	FREE(pmc_pcpu_saved, M_PMC);
-	pmc_pcpu_saved = NULL;
-
-	if (pmc_pmcdisp) {
-		FREE(pmc_pmcdisp, M_PMC);
-		pmc_pmcdisp = NULL;
-	}
-
-	sx_xunlock(&pmc_sx); 	/* we are done */
-}
-
-/*
- * The function called at load/unload.
- */
-
-static int
-load (struct module *module __unused, int cmd, void *arg __unused)
-{
-	int error;
-
-	error = 0;
-
-	switch (cmd) {
-	case MOD_LOAD :
-		/* initialize the subsystem */
-		error = pmc_initialize();
-		if (error != 0)
-			break;
-		PMCDBG(MOD,INI,1, "syscall=%d ncpus=%d",
-		    pmc_syscall_num, mp_ncpus);
-		break;
-
-
-	case MOD_UNLOAD :
-	case MOD_SHUTDOWN:
-		pmc_cleanup();
-		PMCDBG(MOD,INI,1, "%s", "unloaded");
-		break;
-
-	default :
-		error = EINVAL;	/* XXX should panic(9) */
-		break;
-	}
-
-	return error;
-}
-
-/* memory pool */
-MALLOC_DEFINE(M_PMC, "pmc", "Memory space for the PMC module");