freebsd-nq/sys/kern/kern_cpuset.c
Attilio Rao e370959707 Fix KTR_CPUMASK in order to accept a string representing a cpuset_t.
This introduce all the underlying support for making this possible (via
the function cpusetobj_strscan() and keeps ktr_cpumask exported.  sparc64
implements its own assembly primitives for tracing events and needs to
properly check it.  Anyway the sparc64 logic is not implemented yet due
to lack of knowledge (by me) and time (by marius), but it is just a
matter of using ktr_cpumask when possible.

Tested and fixed by:	pluknet
Reviewed by:		marius
2011-05-31 20:48:58 +00:00

1174 lines
28 KiB
C

/*-
* Copyright (c) 2008, Jeffrey Roberson <jeff@freebsd.org>
* All rights reserved.
*
* Copyright (c) 2008 Nokia Corporation
* 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 unmodified, 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 ``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 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 "opt_ddb.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/refcount.h>
#include <sys/sched.h>
#include <sys/smp.h>
#include <sys/syscallsubr.h>
#include <sys/cpuset.h>
#include <sys/sx.h>
#include <sys/queue.h>
#include <sys/libkern.h>
#include <sys/limits.h>
#include <sys/bus.h>
#include <sys/interrupt.h>
#include <vm/uma.h>
#ifdef DDB
#include <ddb/ddb.h>
#endif /* DDB */
/*
* cpusets provide a mechanism for creating and manipulating sets of
* processors for the purpose of constraining the scheduling of threads to
* specific processors.
*
* Each process belongs to an identified set, by default this is set 1. Each
* thread may further restrict the cpus it may run on to a subset of this
* named set. This creates an anonymous set which other threads and processes
* may not join by number.
*
* The named set is referred to herein as the 'base' set to avoid ambiguity.
* This set is usually a child of a 'root' set while the anonymous set may
* simply be referred to as a mask. In the syscall api these are referred to
* as the ROOT, CPUSET, and MASK levels where CPUSET is called 'base' here.
*
* Threads inherit their set from their creator whether it be anonymous or
* not. This means that anonymous sets are immutable because they may be
* shared. To modify an anonymous set a new set is created with the desired
* mask and the same parent as the existing anonymous set. This gives the
* illusion of each thread having a private mask.
*
* Via the syscall apis a user may ask to retrieve or modify the root, base,
* or mask that is discovered via a pid, tid, or setid. Modifying a set
* modifies all numbered and anonymous child sets to comply with the new mask.
* Modifying a pid or tid's mask applies only to that tid but must still
* exist within the assigned parent set.
*
* A thread may not be assigned to a group separate from other threads in
* the process. This is to remove ambiguity when the setid is queried with
* a pid argument. There is no other technical limitation.
*
* This somewhat complex arrangement is intended to make it easy for
* applications to query available processors and bind their threads to
* specific processors while also allowing administrators to dynamically
* reprovision by changing sets which apply to groups of processes.
*
* A simple application should not concern itself with sets at all and
* rather apply masks to its own threads via CPU_WHICH_TID and a -1 id
* meaning 'curthread'. It may query available cpus for that tid with a
* getaffinity call using (CPU_LEVEL_CPUSET, CPU_WHICH_PID, -1, ...).
*/
static uma_zone_t cpuset_zone;
static struct mtx cpuset_lock;
static struct setlist cpuset_ids;
static struct unrhdr *cpuset_unr;
static struct cpuset *cpuset_zero;
/* Return the size of cpuset_t at the kernel level */
SYSCTL_INT(_kern_sched, OID_AUTO, cpusetsize, CTLFLAG_RD,
0, sizeof(cpuset_t), "sizeof(cpuset_t)");
cpuset_t *cpuset_root;
/*
* Acquire a reference to a cpuset, all pointers must be tracked with refs.
*/
struct cpuset *
cpuset_ref(struct cpuset *set)
{
refcount_acquire(&set->cs_ref);
return (set);
}
/*
* Walks up the tree from 'set' to find the root. Returns the root
* referenced.
*/
static struct cpuset *
cpuset_refroot(struct cpuset *set)
{
for (; set->cs_parent != NULL; set = set->cs_parent)
if (set->cs_flags & CPU_SET_ROOT)
break;
cpuset_ref(set);
return (set);
}
/*
* Find the first non-anonymous set starting from 'set'. Returns this set
* referenced. May return the passed in set with an extra ref if it is
* not anonymous.
*/
static struct cpuset *
cpuset_refbase(struct cpuset *set)
{
if (set->cs_id == CPUSET_INVALID)
set = set->cs_parent;
cpuset_ref(set);
return (set);
}
/*
* Release a reference in a context where it is safe to allocate.
*/
void
cpuset_rel(struct cpuset *set)
{
cpusetid_t id;
if (refcount_release(&set->cs_ref) == 0)
return;
mtx_lock_spin(&cpuset_lock);
LIST_REMOVE(set, cs_siblings);
id = set->cs_id;
if (id != CPUSET_INVALID)
LIST_REMOVE(set, cs_link);
mtx_unlock_spin(&cpuset_lock);
cpuset_rel(set->cs_parent);
uma_zfree(cpuset_zone, set);
if (id != CPUSET_INVALID)
free_unr(cpuset_unr, id);
}
/*
* Deferred release must be used when in a context that is not safe to
* allocate/free. This places any unreferenced sets on the list 'head'.
*/
static void
cpuset_rel_defer(struct setlist *head, struct cpuset *set)
{
if (refcount_release(&set->cs_ref) == 0)
return;
mtx_lock_spin(&cpuset_lock);
LIST_REMOVE(set, cs_siblings);
if (set->cs_id != CPUSET_INVALID)
LIST_REMOVE(set, cs_link);
LIST_INSERT_HEAD(head, set, cs_link);
mtx_unlock_spin(&cpuset_lock);
}
/*
* Complete a deferred release. Removes the set from the list provided to
* cpuset_rel_defer.
*/
static void
cpuset_rel_complete(struct cpuset *set)
{
LIST_REMOVE(set, cs_link);
cpuset_rel(set->cs_parent);
uma_zfree(cpuset_zone, set);
}
/*
* Find a set based on an id. Returns it with a ref.
*/
static struct cpuset *
cpuset_lookup(cpusetid_t setid, struct thread *td)
{
struct cpuset *set;
if (setid == CPUSET_INVALID)
return (NULL);
mtx_lock_spin(&cpuset_lock);
LIST_FOREACH(set, &cpuset_ids, cs_link)
if (set->cs_id == setid)
break;
if (set)
cpuset_ref(set);
mtx_unlock_spin(&cpuset_lock);
KASSERT(td != NULL, ("[%s:%d] td is NULL", __func__, __LINE__));
if (set != NULL && jailed(td->td_ucred)) {
struct cpuset *jset, *tset;
jset = td->td_ucred->cr_prison->pr_cpuset;
for (tset = set; tset != NULL; tset = tset->cs_parent)
if (tset == jset)
break;
if (tset == NULL) {
cpuset_rel(set);
set = NULL;
}
}
return (set);
}
/*
* Create a set in the space provided in 'set' with the provided parameters.
* The set is returned with a single ref. May return EDEADLK if the set
* will have no valid cpu based on restrictions from the parent.
*/
static int
_cpuset_create(struct cpuset *set, struct cpuset *parent, const cpuset_t *mask,
cpusetid_t id)
{
if (!CPU_OVERLAP(&parent->cs_mask, mask))
return (EDEADLK);
CPU_COPY(mask, &set->cs_mask);
LIST_INIT(&set->cs_children);
refcount_init(&set->cs_ref, 1);
set->cs_flags = 0;
mtx_lock_spin(&cpuset_lock);
CPU_AND(&set->cs_mask, &parent->cs_mask);
set->cs_id = id;
set->cs_parent = cpuset_ref(parent);
LIST_INSERT_HEAD(&parent->cs_children, set, cs_siblings);
if (set->cs_id != CPUSET_INVALID)
LIST_INSERT_HEAD(&cpuset_ids, set, cs_link);
mtx_unlock_spin(&cpuset_lock);
return (0);
}
/*
* Create a new non-anonymous set with the requested parent and mask. May
* return failures if the mask is invalid or a new number can not be
* allocated.
*/
static int
cpuset_create(struct cpuset **setp, struct cpuset *parent, const cpuset_t *mask)
{
struct cpuset *set;
cpusetid_t id;
int error;
id = alloc_unr(cpuset_unr);
if (id == -1)
return (ENFILE);
*setp = set = uma_zalloc(cpuset_zone, M_WAITOK);
error = _cpuset_create(set, parent, mask, id);
if (error == 0)
return (0);
free_unr(cpuset_unr, id);
uma_zfree(cpuset_zone, set);
return (error);
}
/*
* Recursively check for errors that would occur from applying mask to
* the tree of sets starting at 'set'. Checks for sets that would become
* empty as well as RDONLY flags.
*/
static int
cpuset_testupdate(struct cpuset *set, cpuset_t *mask)
{
struct cpuset *nset;
cpuset_t newmask;
int error;
mtx_assert(&cpuset_lock, MA_OWNED);
if (set->cs_flags & CPU_SET_RDONLY)
return (EPERM);
if (!CPU_OVERLAP(&set->cs_mask, mask))
return (EDEADLK);
CPU_COPY(&set->cs_mask, &newmask);
CPU_AND(&newmask, mask);
error = 0;
LIST_FOREACH(nset, &set->cs_children, cs_siblings)
if ((error = cpuset_testupdate(nset, &newmask)) != 0)
break;
return (error);
}
/*
* Applies the mask 'mask' without checking for empty sets or permissions.
*/
static void
cpuset_update(struct cpuset *set, cpuset_t *mask)
{
struct cpuset *nset;
mtx_assert(&cpuset_lock, MA_OWNED);
CPU_AND(&set->cs_mask, mask);
LIST_FOREACH(nset, &set->cs_children, cs_siblings)
cpuset_update(nset, &set->cs_mask);
return;
}
/*
* Modify the set 'set' to use a copy of the mask provided. Apply this new
* mask to restrict all children in the tree. Checks for validity before
* applying the changes.
*/
static int
cpuset_modify(struct cpuset *set, cpuset_t *mask)
{
struct cpuset *root;
int error;
error = priv_check(curthread, PRIV_SCHED_CPUSET);
if (error)
return (error);
/*
* In case we are called from within the jail
* we do not allow modifying the dedicated root
* cpuset of the jail but may still allow to
* change child sets.
*/
if (jailed(curthread->td_ucred) &&
set->cs_flags & CPU_SET_ROOT)
return (EPERM);
/*
* Verify that we have access to this set of
* cpus.
*/
root = set->cs_parent;
if (root && !CPU_SUBSET(&root->cs_mask, mask))
return (EINVAL);
mtx_lock_spin(&cpuset_lock);
error = cpuset_testupdate(set, mask);
if (error)
goto out;
cpuset_update(set, mask);
CPU_COPY(mask, &set->cs_mask);
out:
mtx_unlock_spin(&cpuset_lock);
return (error);
}
/*
* Resolve the 'which' parameter of several cpuset apis.
*
* For WHICH_PID and WHICH_TID return a locked proc and valid proc/tid. Also
* checks for permission via p_cansched().
*
* For WHICH_SET returns a valid set with a new reference.
*
* -1 may be supplied for any argument to mean the current proc/thread or
* the base set of the current thread. May fail with ESRCH/EPERM.
*/
static int
cpuset_which(cpuwhich_t which, id_t id, struct proc **pp, struct thread **tdp,
struct cpuset **setp)
{
struct cpuset *set;
struct thread *td;
struct proc *p;
int error;
*pp = p = NULL;
*tdp = td = NULL;
*setp = set = NULL;
switch (which) {
case CPU_WHICH_PID:
if (id == -1) {
PROC_LOCK(curproc);
p = curproc;
break;
}
if ((p = pfind(id)) == NULL)
return (ESRCH);
break;
case CPU_WHICH_TID:
if (id == -1) {
PROC_LOCK(curproc);
p = curproc;
td = curthread;
break;
}
td = tdfind(id, -1);
if (td == NULL)
return (ESRCH);
p = td->td_proc;
break;
case CPU_WHICH_CPUSET:
if (id == -1) {
thread_lock(curthread);
set = cpuset_refbase(curthread->td_cpuset);
thread_unlock(curthread);
} else
set = cpuset_lookup(id, curthread);
if (set) {
*setp = set;
return (0);
}
return (ESRCH);
case CPU_WHICH_JAIL:
{
/* Find `set' for prison with given id. */
struct prison *pr;
sx_slock(&allprison_lock);
pr = prison_find_child(curthread->td_ucred->cr_prison, id);
sx_sunlock(&allprison_lock);
if (pr == NULL)
return (ESRCH);
cpuset_ref(pr->pr_cpuset);
*setp = pr->pr_cpuset;
mtx_unlock(&pr->pr_mtx);
return (0);
}
case CPU_WHICH_IRQ:
return (0);
default:
return (EINVAL);
}
error = p_cansched(curthread, p);
if (error) {
PROC_UNLOCK(p);
return (error);
}
if (td == NULL)
td = FIRST_THREAD_IN_PROC(p);
*pp = p;
*tdp = td;
return (0);
}
/*
* Create an anonymous set with the provided mask in the space provided by
* 'fset'. If the passed in set is anonymous we use its parent otherwise
* the new set is a child of 'set'.
*/
static int
cpuset_shadow(struct cpuset *set, struct cpuset *fset, const cpuset_t *mask)
{
struct cpuset *parent;
if (set->cs_id == CPUSET_INVALID)
parent = set->cs_parent;
else
parent = set;
if (!CPU_SUBSET(&parent->cs_mask, mask))
return (EDEADLK);
return (_cpuset_create(fset, parent, mask, CPUSET_INVALID));
}
/*
* Handle two cases for replacing the base set or mask of an entire process.
*
* 1) Set is non-null and mask is null. This reparents all anonymous sets
* to the provided set and replaces all non-anonymous td_cpusets with the
* provided set.
* 2) Mask is non-null and set is null. This replaces or creates anonymous
* sets for every thread with the existing base as a parent.
*
* This is overly complicated because we can't allocate while holding a
* spinlock and spinlocks must be held while changing and examining thread
* state.
*/
static int
cpuset_setproc(pid_t pid, struct cpuset *set, cpuset_t *mask)
{
struct setlist freelist;
struct setlist droplist;
struct cpuset *tdset;
struct cpuset *nset;
struct thread *td;
struct proc *p;
int threads;
int nfree;
int error;
/*
* The algorithm requires two passes due to locking considerations.
*
* 1) Lookup the process and acquire the locks in the required order.
* 2) If enough cpusets have not been allocated release the locks and
* allocate them. Loop.
*/
LIST_INIT(&freelist);
LIST_INIT(&droplist);
nfree = 0;
for (;;) {
error = cpuset_which(CPU_WHICH_PID, pid, &p, &td, &nset);
if (error)
goto out;
if (nfree >= p->p_numthreads)
break;
threads = p->p_numthreads;
PROC_UNLOCK(p);
for (; nfree < threads; nfree++) {
nset = uma_zalloc(cpuset_zone, M_WAITOK);
LIST_INSERT_HEAD(&freelist, nset, cs_link);
}
}
PROC_LOCK_ASSERT(p, MA_OWNED);
/*
* Now that the appropriate locks are held and we have enough cpusets,
* make sure the operation will succeed before applying changes. The
* proc lock prevents td_cpuset from changing between calls.
*/
error = 0;
FOREACH_THREAD_IN_PROC(p, td) {
thread_lock(td);
tdset = td->td_cpuset;
/*
* Verify that a new mask doesn't specify cpus outside of
* the set the thread is a member of.
*/
if (mask) {
if (tdset->cs_id == CPUSET_INVALID)
tdset = tdset->cs_parent;
if (!CPU_SUBSET(&tdset->cs_mask, mask))
error = EDEADLK;
/*
* Verify that a new set won't leave an existing thread
* mask without a cpu to run on. It can, however, restrict
* the set.
*/
} else if (tdset->cs_id == CPUSET_INVALID) {
if (!CPU_OVERLAP(&set->cs_mask, &tdset->cs_mask))
error = EDEADLK;
}
thread_unlock(td);
if (error)
goto unlock_out;
}
/*
* Replace each thread's cpuset while using deferred release. We
* must do this because the thread lock must be held while operating
* on the thread and this limits the type of operations allowed.
*/
FOREACH_THREAD_IN_PROC(p, td) {
thread_lock(td);
/*
* If we presently have an anonymous set or are applying a
* mask we must create an anonymous shadow set. That is
* either parented to our existing base or the supplied set.
*
* If we have a base set with no anonymous shadow we simply
* replace it outright.
*/
tdset = td->td_cpuset;
if (tdset->cs_id == CPUSET_INVALID || mask) {
nset = LIST_FIRST(&freelist);
LIST_REMOVE(nset, cs_link);
if (mask)
error = cpuset_shadow(tdset, nset, mask);
else
error = _cpuset_create(nset, set,
&tdset->cs_mask, CPUSET_INVALID);
if (error) {
LIST_INSERT_HEAD(&freelist, nset, cs_link);
thread_unlock(td);
break;
}
} else
nset = cpuset_ref(set);
cpuset_rel_defer(&droplist, tdset);
td->td_cpuset = nset;
sched_affinity(td);
thread_unlock(td);
}
unlock_out:
PROC_UNLOCK(p);
out:
while ((nset = LIST_FIRST(&droplist)) != NULL)
cpuset_rel_complete(nset);
while ((nset = LIST_FIRST(&freelist)) != NULL) {
LIST_REMOVE(nset, cs_link);
uma_zfree(cpuset_zone, nset);
}
return (error);
}
/*
* Calculate the ffs() of the cpuset.
*/
int
cpusetobj_ffs(const cpuset_t *set)
{
size_t i;
int cbit;
cbit = 0;
for (i = 0; i < _NCPUWORDS; i++) {
if (set->__bits[i] != 0) {
cbit = ffsl(set->__bits[i]);
cbit += i * _NCPUBITS;
break;
}
}
return (cbit);
}
/*
* Return a string representing a valid layout for a cpuset_t object.
* It expects an incoming buffer at least sized as CPUSETBUFSIZ.
*/
char *
cpusetobj_strprint(char *buf, const cpuset_t *set)
{
char *tbuf;
size_t i, bytesp, bufsiz;
tbuf = buf;
bytesp = 0;
bufsiz = CPUSETBUFSIZ;
for (i = _NCPUWORDS - 1; i > 0; i--) {
bytesp = snprintf(tbuf, bufsiz, "%lx, ", set->__bits[i]);
bufsiz -= bytesp;
tbuf += bytesp;
}
snprintf(tbuf, bufsiz, "%lx", set->__bits[0]);
return (buf);
}
/*
* Build a valid cpuset_t object from a string representation.
* It expects an incoming buffer at least sized as CPUSETBUFSIZ.
*/
int
cpusetobj_strscan(cpuset_t *set, const char *buf)
{
u_int nwords;
int i, ret;
if (strlen(buf) > CPUSETBUFSIZ - 1)
return (-1);
/* Allow to pass a shorter version of the mask when necessary. */
nwords = 1;
for (i = 0; buf[i] != '\0'; i++)
if (buf[i] == ',')
nwords++;
if (nwords > _NCPUWORDS)
return (-1);
CPU_ZERO(set);
for (i = nwords - 1; i > 0; i--) {
ret = sscanf(buf, "%lx, ", &set->__bits[i]);
if (ret == 0 || ret == -1)
return (-1);
buf = strstr(buf, " ");
if (buf == NULL)
return (-1);
buf++;
}
ret = sscanf(buf, "%lx", &set->__bits[0]);
if (ret == 0 || ret == -1)
return (-1);
return (0);
}
/*
* Apply an anonymous mask to a single thread.
*/
int
cpuset_setthread(lwpid_t id, cpuset_t *mask)
{
struct cpuset *nset;
struct cpuset *set;
struct thread *td;
struct proc *p;
int error;
nset = uma_zalloc(cpuset_zone, M_WAITOK);
error = cpuset_which(CPU_WHICH_TID, id, &p, &td, &set);
if (error)
goto out;
set = NULL;
thread_lock(td);
error = cpuset_shadow(td->td_cpuset, nset, mask);
if (error == 0) {
set = td->td_cpuset;
td->td_cpuset = nset;
sched_affinity(td);
nset = NULL;
}
thread_unlock(td);
PROC_UNLOCK(p);
if (set)
cpuset_rel(set);
out:
if (nset)
uma_zfree(cpuset_zone, nset);
return (error);
}
/*
* Creates the cpuset for thread0. We make two sets:
*
* 0 - The root set which should represent all valid processors in the
* system. It is initially created with a mask of all processors
* because we don't know what processors are valid until cpuset_init()
* runs. This set is immutable.
* 1 - The default set which all processes are a member of until changed.
* This allows an administrator to move all threads off of given cpus to
* dedicate them to high priority tasks or save power etc.
*/
struct cpuset *
cpuset_thread0(void)
{
struct cpuset *set;
int error;
cpuset_zone = uma_zcreate("cpuset", sizeof(struct cpuset), NULL, NULL,
NULL, NULL, UMA_ALIGN_PTR, 0);
mtx_init(&cpuset_lock, "cpuset", NULL, MTX_SPIN | MTX_RECURSE);
/*
* Create the root system set for the whole machine. Doesn't use
* cpuset_create() due to NULL parent.
*/
set = uma_zalloc(cpuset_zone, M_WAITOK | M_ZERO);
CPU_FILL(&set->cs_mask);
LIST_INIT(&set->cs_children);
LIST_INSERT_HEAD(&cpuset_ids, set, cs_link);
set->cs_ref = 1;
set->cs_flags = CPU_SET_ROOT;
cpuset_zero = set;
cpuset_root = &set->cs_mask;
/*
* Now derive a default, modifiable set from that to give out.
*/
set = uma_zalloc(cpuset_zone, M_WAITOK);
error = _cpuset_create(set, cpuset_zero, &cpuset_zero->cs_mask, 1);
KASSERT(error == 0, ("Error creating default set: %d\n", error));
/*
* Initialize the unit allocator. 0 and 1 are allocated above.
*/
cpuset_unr = new_unrhdr(2, INT_MAX, NULL);
return (set);
}
/*
* Create a cpuset, which would be cpuset_create() but
* mark the new 'set' as root.
*
* We are not going to reparent the td to it. Use cpuset_setproc_update_set()
* for that.
*
* In case of no error, returns the set in *setp locked with a reference.
*/
int
cpuset_create_root(struct prison *pr, struct cpuset **setp)
{
struct cpuset *set;
int error;
KASSERT(pr != NULL, ("[%s:%d] invalid pr", __func__, __LINE__));
KASSERT(setp != NULL, ("[%s:%d] invalid setp", __func__, __LINE__));
error = cpuset_create(setp, pr->pr_cpuset, &pr->pr_cpuset->cs_mask);
if (error)
return (error);
KASSERT(*setp != NULL, ("[%s:%d] cpuset_create returned invalid data",
__func__, __LINE__));
/* Mark the set as root. */
set = *setp;
set->cs_flags |= CPU_SET_ROOT;
return (0);
}
int
cpuset_setproc_update_set(struct proc *p, struct cpuset *set)
{
int error;
KASSERT(p != NULL, ("[%s:%d] invalid proc", __func__, __LINE__));
KASSERT(set != NULL, ("[%s:%d] invalid set", __func__, __LINE__));
cpuset_ref(set);
error = cpuset_setproc(p->p_pid, set, NULL);
if (error)
return (error);
cpuset_rel(set);
return (0);
}
/*
* This is called once the final set of system cpus is known. Modifies
* the root set and all children and mark the root read-only.
*/
static void
cpuset_init(void *arg)
{
cpuset_t mask;
mask = all_cpus;
if (cpuset_modify(cpuset_zero, &mask))
panic("Can't set initial cpuset mask.\n");
cpuset_zero->cs_flags |= CPU_SET_RDONLY;
}
SYSINIT(cpuset, SI_SUB_SMP, SI_ORDER_ANY, cpuset_init, NULL);
#ifndef _SYS_SYSPROTO_H_
struct cpuset_args {
cpusetid_t *setid;
};
#endif
int
cpuset(struct thread *td, struct cpuset_args *uap)
{
struct cpuset *root;
struct cpuset *set;
int error;
thread_lock(td);
root = cpuset_refroot(td->td_cpuset);
thread_unlock(td);
error = cpuset_create(&set, root, &root->cs_mask);
cpuset_rel(root);
if (error)
return (error);
error = copyout(&set->cs_id, uap->setid, sizeof(set->cs_id));
if (error == 0)
error = cpuset_setproc(-1, set, NULL);
cpuset_rel(set);
return (error);
}
#ifndef _SYS_SYSPROTO_H_
struct cpuset_setid_args {
cpuwhich_t which;
id_t id;
cpusetid_t setid;
};
#endif
int
cpuset_setid(struct thread *td, struct cpuset_setid_args *uap)
{
struct cpuset *set;
int error;
/*
* Presently we only support per-process sets.
*/
if (uap->which != CPU_WHICH_PID)
return (EINVAL);
set = cpuset_lookup(uap->setid, td);
if (set == NULL)
return (ESRCH);
error = cpuset_setproc(uap->id, set, NULL);
cpuset_rel(set);
return (error);
}
#ifndef _SYS_SYSPROTO_H_
struct cpuset_getid_args {
cpulevel_t level;
cpuwhich_t which;
id_t id;
cpusetid_t *setid;
#endif
int
cpuset_getid(struct thread *td, struct cpuset_getid_args *uap)
{
struct cpuset *nset;
struct cpuset *set;
struct thread *ttd;
struct proc *p;
cpusetid_t id;
int error;
if (uap->level == CPU_LEVEL_WHICH && uap->which != CPU_WHICH_CPUSET)
return (EINVAL);
error = cpuset_which(uap->which, uap->id, &p, &ttd, &set);
if (error)
return (error);
switch (uap->which) {
case CPU_WHICH_TID:
case CPU_WHICH_PID:
thread_lock(ttd);
set = cpuset_refbase(ttd->td_cpuset);
thread_unlock(ttd);
PROC_UNLOCK(p);
break;
case CPU_WHICH_CPUSET:
case CPU_WHICH_JAIL:
break;
case CPU_WHICH_IRQ:
return (EINVAL);
}
switch (uap->level) {
case CPU_LEVEL_ROOT:
nset = cpuset_refroot(set);
cpuset_rel(set);
set = nset;
break;
case CPU_LEVEL_CPUSET:
break;
case CPU_LEVEL_WHICH:
break;
}
id = set->cs_id;
cpuset_rel(set);
if (error == 0)
error = copyout(&id, uap->setid, sizeof(id));
return (error);
}
#ifndef _SYS_SYSPROTO_H_
struct cpuset_getaffinity_args {
cpulevel_t level;
cpuwhich_t which;
id_t id;
size_t cpusetsize;
cpuset_t *mask;
};
#endif
int
cpuset_getaffinity(struct thread *td, struct cpuset_getaffinity_args *uap)
{
struct thread *ttd;
struct cpuset *nset;
struct cpuset *set;
struct proc *p;
cpuset_t *mask;
int error;
size_t size;
if (uap->cpusetsize < sizeof(cpuset_t) ||
uap->cpusetsize > CPU_MAXSIZE / NBBY)
return (ERANGE);
size = uap->cpusetsize;
mask = malloc(size, M_TEMP, M_WAITOK | M_ZERO);
error = cpuset_which(uap->which, uap->id, &p, &ttd, &set);
if (error)
goto out;
switch (uap->level) {
case CPU_LEVEL_ROOT:
case CPU_LEVEL_CPUSET:
switch (uap->which) {
case CPU_WHICH_TID:
case CPU_WHICH_PID:
thread_lock(ttd);
set = cpuset_ref(ttd->td_cpuset);
thread_unlock(ttd);
break;
case CPU_WHICH_CPUSET:
case CPU_WHICH_JAIL:
break;
case CPU_WHICH_IRQ:
error = EINVAL;
goto out;
}
if (uap->level == CPU_LEVEL_ROOT)
nset = cpuset_refroot(set);
else
nset = cpuset_refbase(set);
CPU_COPY(&nset->cs_mask, mask);
cpuset_rel(nset);
break;
case CPU_LEVEL_WHICH:
switch (uap->which) {
case CPU_WHICH_TID:
thread_lock(ttd);
CPU_COPY(&ttd->td_cpuset->cs_mask, mask);
thread_unlock(ttd);
break;
case CPU_WHICH_PID:
FOREACH_THREAD_IN_PROC(p, ttd) {
thread_lock(ttd);
CPU_OR(mask, &ttd->td_cpuset->cs_mask);
thread_unlock(ttd);
}
break;
case CPU_WHICH_CPUSET:
case CPU_WHICH_JAIL:
CPU_COPY(&set->cs_mask, mask);
break;
case CPU_WHICH_IRQ:
error = intr_getaffinity(uap->id, mask);
break;
}
break;
default:
error = EINVAL;
break;
}
if (set)
cpuset_rel(set);
if (p)
PROC_UNLOCK(p);
if (error == 0)
error = copyout(mask, uap->mask, size);
out:
free(mask, M_TEMP);
return (error);
}
#ifndef _SYS_SYSPROTO_H_
struct cpuset_setaffinity_args {
cpulevel_t level;
cpuwhich_t which;
id_t id;
size_t cpusetsize;
const cpuset_t *mask;
};
#endif
int
cpuset_setaffinity(struct thread *td, struct cpuset_setaffinity_args *uap)
{
struct cpuset *nset;
struct cpuset *set;
struct thread *ttd;
struct proc *p;
cpuset_t *mask;
int error;
if (uap->cpusetsize < sizeof(cpuset_t) ||
uap->cpusetsize > CPU_MAXSIZE / NBBY)
return (ERANGE);
mask = malloc(uap->cpusetsize, M_TEMP, M_WAITOK | M_ZERO);
error = copyin(uap->mask, mask, uap->cpusetsize);
if (error)
goto out;
/*
* Verify that no high bits are set.
*/
if (uap->cpusetsize > sizeof(cpuset_t)) {
char *end;
char *cp;
end = cp = (char *)&mask->__bits;
end += uap->cpusetsize;
cp += sizeof(cpuset_t);
while (cp != end)
if (*cp++ != 0) {
error = EINVAL;
goto out;
}
}
switch (uap->level) {
case CPU_LEVEL_ROOT:
case CPU_LEVEL_CPUSET:
error = cpuset_which(uap->which, uap->id, &p, &ttd, &set);
if (error)
break;
switch (uap->which) {
case CPU_WHICH_TID:
case CPU_WHICH_PID:
thread_lock(ttd);
set = cpuset_ref(ttd->td_cpuset);
thread_unlock(ttd);
PROC_UNLOCK(p);
break;
case CPU_WHICH_CPUSET:
case CPU_WHICH_JAIL:
break;
case CPU_WHICH_IRQ:
error = EINVAL;
goto out;
}
if (uap->level == CPU_LEVEL_ROOT)
nset = cpuset_refroot(set);
else
nset = cpuset_refbase(set);
error = cpuset_modify(nset, mask);
cpuset_rel(nset);
cpuset_rel(set);
break;
case CPU_LEVEL_WHICH:
switch (uap->which) {
case CPU_WHICH_TID:
error = cpuset_setthread(uap->id, mask);
break;
case CPU_WHICH_PID:
error = cpuset_setproc(uap->id, NULL, mask);
break;
case CPU_WHICH_CPUSET:
case CPU_WHICH_JAIL:
error = cpuset_which(uap->which, uap->id, &p,
&ttd, &set);
if (error == 0) {
error = cpuset_modify(set, mask);
cpuset_rel(set);
}
break;
case CPU_WHICH_IRQ:
error = intr_setaffinity(uap->id, mask);
break;
default:
error = EINVAL;
break;
}
break;
default:
error = EINVAL;
break;
}
out:
free(mask, M_TEMP);
return (error);
}
#ifdef DDB
DB_SHOW_COMMAND(cpusets, db_show_cpusets)
{
struct cpuset *set;
int cpu, once;
LIST_FOREACH(set, &cpuset_ids, cs_link) {
db_printf("set=%p id=%-6u ref=%-6d flags=0x%04x parent id=%d\n",
set, set->cs_id, set->cs_ref, set->cs_flags,
(set->cs_parent != NULL) ? set->cs_parent->cs_id : 0);
db_printf(" mask=");
for (once = 0, cpu = 0; cpu < CPU_SETSIZE; cpu++) {
if (CPU_ISSET(cpu, &set->cs_mask)) {
if (once == 0) {
db_printf("%d", cpu);
once = 1;
} else
db_printf(",%d", cpu);
}
}
db_printf("\n");
if (db_pager_quit)
break;
}
}
#endif /* DDB */