e602ba25fd
The ability to schedule multiple threads per process (one one cpu) by making ALL system calls optionally asynchronous. to come: ia64 and power-pc patches, patches for gdb, test program (in tools) Reviewed by: Almost everyone who counts (at various times, peter, jhb, matt, alfred, mini, bernd, and a cast of thousands) NOTE: this is still Beta code, and contains lots of debugging stuff. expect slight instability in signals..
582 lines
14 KiB
C
582 lines
14 KiB
C
/*
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* Copyright (c) 1982, 1986, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_subr.c 8.3 (Berkeley) 1/21/94
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* $FreeBSD$
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*/
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#include "opt_zero.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/ktr.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <sys/resourcevar.h>
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#include <sys/sysctl.h>
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#include <sys/vnode.h>
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#include <vm/vm.h>
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#include <vm/vm_page.h>
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#include <vm/vm_map.h>
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SYSCTL_INT(_kern, KERN_IOV_MAX, iov_max, CTLFLAG_RD, NULL, UIO_MAXIOV,
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"Maximum number of elements in an I/O vector; sysconf(_SC_IOV_MAX)");
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#ifdef ZERO_COPY_SOCKETS
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <sys/lock.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_page.h>
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#include <vm/vm_object.h>
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#include <vm/vm_pager.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_extern.h>
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#include <vm/swap_pager.h>
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#include <sys/mbuf.h>
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#include <machine/cpu.h>
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/* Declared in uipc_socket.c */
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extern int so_zero_copy_receive;
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static int vm_pgmoveco(vm_map_t mapa, vm_object_t srcobj, vm_offset_t kaddr,
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vm_offset_t uaddr);
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static int userspaceco(caddr_t cp, u_int cnt, struct uio *uio,
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struct vm_object *obj, int disposable);
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static int
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vm_pgmoveco(mapa, srcobj, kaddr, uaddr)
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vm_map_t mapa;
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vm_object_t srcobj;
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vm_offset_t kaddr, uaddr;
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{
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vm_map_t map = mapa;
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vm_page_t kern_pg, user_pg;
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vm_object_t uobject;
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vm_map_entry_t entry;
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vm_pindex_t upindex, kpindex;
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vm_prot_t prot;
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boolean_t wired;
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/*
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* First lookup the kernel page.
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*/
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kern_pg = PHYS_TO_VM_PAGE(vtophys(kaddr));
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if ((vm_map_lookup(&map, uaddr,
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VM_PROT_READ, &entry, &uobject,
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&upindex, &prot, &wired)) != KERN_SUCCESS) {
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return(EFAULT);
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}
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if ((user_pg = vm_page_lookup(uobject, upindex)) != NULL) {
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vm_page_sleep_busy(user_pg, 1, "vm_pgmoveco");
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pmap_remove(map->pmap, uaddr, uaddr+PAGE_SIZE);
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vm_page_busy(user_pg);
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vm_page_free(user_pg);
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}
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if (kern_pg->busy || ((kern_pg->queue - kern_pg->pc) == PQ_FREE) ||
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(kern_pg->hold_count != 0)|| (kern_pg->flags & PG_BUSY)) {
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printf("vm_pgmoveco: pindex(%lu), busy(%d), PG_BUSY(%d), "
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"hold(%d) paddr(0x%lx)\n", (u_long)kern_pg->pindex,
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kern_pg->busy, (kern_pg->flags & PG_BUSY) ? 1 : 0,
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kern_pg->hold_count, (u_long)kern_pg->phys_addr);
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if ((kern_pg->queue - kern_pg->pc) == PQ_FREE)
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panic("vm_pgmoveco: renaming free page");
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else
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panic("vm_pgmoveco: renaming busy page");
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}
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kpindex = kern_pg->pindex;
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vm_page_busy(kern_pg);
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vm_page_rename(kern_pg, uobject, upindex);
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vm_page_flag_clear(kern_pg, PG_BUSY);
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kern_pg->valid = VM_PAGE_BITS_ALL;
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vm_map_lookup_done(map, entry);
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return(KERN_SUCCESS);
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}
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#endif /* ZERO_COPY_SOCKETS */
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int
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uiomove(cp, n, uio)
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register caddr_t cp;
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register int n;
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register struct uio *uio;
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{
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struct thread *td = curthread;
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register struct iovec *iov;
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u_int cnt;
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int error = 0;
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int save = 0;
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KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
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("uiomove: mode"));
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KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
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("uiomove proc"));
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if (td) {
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mtx_lock_spin(&sched_lock);
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save = td->td_flags & TDF_DEADLKTREAT;
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td->td_flags |= TDF_DEADLKTREAT;
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mtx_unlock_spin(&sched_lock);
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}
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while (n > 0 && uio->uio_resid) {
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iov = uio->uio_iov;
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cnt = iov->iov_len;
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if (cnt == 0) {
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uio->uio_iov++;
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uio->uio_iovcnt--;
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continue;
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}
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if (cnt > n)
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cnt = n;
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switch (uio->uio_segflg) {
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case UIO_USERSPACE:
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if (ticks - PCPU_GET(switchticks) >= hogticks)
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uio_yield();
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if (uio->uio_rw == UIO_READ)
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error = copyout(cp, iov->iov_base, cnt);
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else
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error = copyin(iov->iov_base, cp, cnt);
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if (error)
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goto out;
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break;
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case UIO_SYSSPACE:
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if (uio->uio_rw == UIO_READ)
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bcopy(cp, iov->iov_base, cnt);
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else
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bcopy(iov->iov_base, cp, cnt);
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break;
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case UIO_NOCOPY:
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break;
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}
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iov->iov_base += cnt;
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iov->iov_len -= cnt;
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uio->uio_resid -= cnt;
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uio->uio_offset += cnt;
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cp += cnt;
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n -= cnt;
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}
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out:
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if (td != curthread) printf("uiomove: IT CHANGED!");
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td = curthread; /* Might things have changed in copyin/copyout? */
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if (td) {
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mtx_lock_spin(&sched_lock);
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td->td_flags = (td->td_flags & ~TDF_DEADLKTREAT) | save;
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mtx_unlock_spin(&sched_lock);
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}
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return (error);
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}
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#if defined(ENABLE_VFS_IOOPT) || defined(ZERO_COPY_SOCKETS)
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/*
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* Experimental support for zero-copy I/O
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*/
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static int
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userspaceco(cp, cnt, uio, obj, disposable)
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caddr_t cp;
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u_int cnt;
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struct uio *uio;
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struct vm_object *obj;
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int disposable;
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{
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struct iovec *iov;
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int error;
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iov = uio->uio_iov;
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#ifdef ZERO_COPY_SOCKETS
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if (uio->uio_rw == UIO_READ) {
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if ((so_zero_copy_receive != 0)
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&& (obj != NULL)
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&& ((cnt & PAGE_MASK) == 0)
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&& ((((intptr_t) iov->iov_base) & PAGE_MASK) == 0)
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&& ((uio->uio_offset & PAGE_MASK) == 0)
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&& ((((intptr_t) cp) & PAGE_MASK) == 0)
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&& (obj->type == OBJT_DEFAULT)
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&& (disposable != 0)) {
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/* SOCKET: use page-trading */
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/*
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* We only want to call vm_pgmoveco() on
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* disposeable pages, since it gives the
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* kernel page to the userland process.
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*/
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error = vm_pgmoveco(&curproc->p_vmspace->vm_map,
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obj, (vm_offset_t)cp,
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(vm_offset_t)iov->iov_base);
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/*
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* If we get an error back, attempt
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* to use copyout() instead. The
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* disposable page should be freed
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* automatically if we weren't able to move
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* it into userland.
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*/
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if (error != 0)
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error = copyout(cp, iov->iov_base, cnt);
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#ifdef ENABLE_VFS_IOOPT
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} else if ((vfs_ioopt != 0)
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&& ((cnt & PAGE_MASK) == 0)
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&& ((((intptr_t) iov->iov_base) & PAGE_MASK) == 0)
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&& ((uio->uio_offset & PAGE_MASK) == 0)
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&& ((((intptr_t) cp) & PAGE_MASK) == 0)) {
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error = vm_uiomove(&curproc->p_vmspace->vm_map, obj,
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uio->uio_offset, cnt,
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(vm_offset_t) iov->iov_base, NULL);
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#endif /* ENABLE_VFS_IOOPT */
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} else {
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error = copyout(cp, iov->iov_base, cnt);
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}
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} else {
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error = copyin(iov->iov_base, cp, cnt);
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}
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#else /* ZERO_COPY_SOCKETS */
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if (uio->uio_rw == UIO_READ) {
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#ifdef ENABLE_VFS_IOOPT
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if ((vfs_ioopt != 0)
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&& ((cnt & PAGE_MASK) == 0)
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&& ((((intptr_t) iov->iov_base) & PAGE_MASK) == 0)
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&& ((uio->uio_offset & PAGE_MASK) == 0)
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&& ((((intptr_t) cp) & PAGE_MASK) == 0)) {
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error = vm_uiomove(&curproc->p_vmspace->vm_map, obj,
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uio->uio_offset, cnt,
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(vm_offset_t) iov->iov_base, NULL);
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} else
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#endif /* ENABLE_VFS_IOOPT */
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{
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error = copyout(cp, iov->iov_base, cnt);
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}
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} else {
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error = copyin(iov->iov_base, cp, cnt);
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}
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#endif /* ZERO_COPY_SOCKETS */
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return (error);
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}
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int
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uiomoveco(cp, n, uio, obj, disposable)
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caddr_t cp;
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int n;
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struct uio *uio;
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struct vm_object *obj;
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int disposable;
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{
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struct iovec *iov;
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u_int cnt;
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int error;
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KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
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("uiomoveco: mode"));
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KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
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("uiomoveco proc"));
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|
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while (n > 0 && uio->uio_resid) {
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iov = uio->uio_iov;
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cnt = iov->iov_len;
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if (cnt == 0) {
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uio->uio_iov++;
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uio->uio_iovcnt--;
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continue;
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}
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if (cnt > n)
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cnt = n;
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|
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switch (uio->uio_segflg) {
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case UIO_USERSPACE:
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if (ticks - PCPU_GET(switchticks) >= hogticks)
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uio_yield();
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error = userspaceco(cp, cnt, uio, obj, disposable);
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|
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if (error)
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return (error);
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break;
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|
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case UIO_SYSSPACE:
|
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if (uio->uio_rw == UIO_READ)
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bcopy(cp, iov->iov_base, cnt);
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else
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bcopy(iov->iov_base, cp, cnt);
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break;
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case UIO_NOCOPY:
|
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break;
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}
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iov->iov_base += cnt;
|
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iov->iov_len -= cnt;
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uio->uio_resid -= cnt;
|
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uio->uio_offset += cnt;
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cp += cnt;
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n -= cnt;
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}
|
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return (0);
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}
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#endif /* ENABLE_VFS_IOOPT || ZERO_COPY_SOCKETS */
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|
|
|
#ifdef ENABLE_VFS_IOOPT
|
|
|
|
/*
|
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* Experimental support for zero-copy I/O
|
|
*/
|
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int
|
|
uioread(n, uio, obj, nread)
|
|
int n;
|
|
struct uio *uio;
|
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struct vm_object *obj;
|
|
int *nread;
|
|
{
|
|
int npagesmoved;
|
|
struct iovec *iov;
|
|
u_int cnt, tcnt;
|
|
int error;
|
|
|
|
*nread = 0;
|
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if (vfs_ioopt < 2)
|
|
return 0;
|
|
|
|
error = 0;
|
|
|
|
while (n > 0 && uio->uio_resid) {
|
|
iov = uio->uio_iov;
|
|
cnt = iov->iov_len;
|
|
if (cnt == 0) {
|
|
uio->uio_iov++;
|
|
uio->uio_iovcnt--;
|
|
continue;
|
|
}
|
|
if (cnt > n)
|
|
cnt = n;
|
|
|
|
if ((uio->uio_segflg == UIO_USERSPACE) &&
|
|
((((intptr_t) iov->iov_base) & PAGE_MASK) == 0) &&
|
|
((uio->uio_offset & PAGE_MASK) == 0) ) {
|
|
|
|
if (cnt < PAGE_SIZE)
|
|
break;
|
|
|
|
cnt &= ~PAGE_MASK;
|
|
|
|
if (ticks - PCPU_GET(switchticks) >= hogticks)
|
|
uio_yield();
|
|
error = vm_uiomove(&curproc->p_vmspace->vm_map, obj,
|
|
uio->uio_offset, cnt,
|
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(vm_offset_t) iov->iov_base, &npagesmoved);
|
|
|
|
if (npagesmoved == 0)
|
|
break;
|
|
|
|
tcnt = npagesmoved * PAGE_SIZE;
|
|
cnt = tcnt;
|
|
|
|
if (error)
|
|
break;
|
|
|
|
iov->iov_base += cnt;
|
|
iov->iov_len -= cnt;
|
|
uio->uio_resid -= cnt;
|
|
uio->uio_offset += cnt;
|
|
*nread += cnt;
|
|
n -= cnt;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
return error;
|
|
}
|
|
#endif /* ENABLE_VFS_IOOPT */
|
|
|
|
/*
|
|
* Give next character to user as result of read.
|
|
*/
|
|
int
|
|
ureadc(c, uio)
|
|
register int c;
|
|
register struct uio *uio;
|
|
{
|
|
register struct iovec *iov;
|
|
|
|
again:
|
|
if (uio->uio_iovcnt == 0 || uio->uio_resid == 0)
|
|
panic("ureadc");
|
|
iov = uio->uio_iov;
|
|
if (iov->iov_len == 0) {
|
|
uio->uio_iovcnt--;
|
|
uio->uio_iov++;
|
|
goto again;
|
|
}
|
|
switch (uio->uio_segflg) {
|
|
|
|
case UIO_USERSPACE:
|
|
if (subyte(iov->iov_base, c) < 0)
|
|
return (EFAULT);
|
|
break;
|
|
|
|
case UIO_SYSSPACE:
|
|
*iov->iov_base = c;
|
|
break;
|
|
|
|
case UIO_NOCOPY:
|
|
break;
|
|
}
|
|
iov->iov_base++;
|
|
iov->iov_len--;
|
|
uio->uio_resid--;
|
|
uio->uio_offset++;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* General routine to allocate a hash table.
|
|
*/
|
|
void *
|
|
hashinit(elements, type, hashmask)
|
|
int elements;
|
|
struct malloc_type *type;
|
|
u_long *hashmask;
|
|
{
|
|
long hashsize;
|
|
LIST_HEAD(generic, generic) *hashtbl;
|
|
int i;
|
|
|
|
if (elements <= 0)
|
|
panic("hashinit: bad elements");
|
|
for (hashsize = 1; hashsize <= elements; hashsize <<= 1)
|
|
continue;
|
|
hashsize >>= 1;
|
|
hashtbl = malloc((u_long)hashsize * sizeof(*hashtbl), type, M_WAITOK);
|
|
for (i = 0; i < hashsize; i++)
|
|
LIST_INIT(&hashtbl[i]);
|
|
*hashmask = hashsize - 1;
|
|
return (hashtbl);
|
|
}
|
|
|
|
static int primes[] = { 1, 13, 31, 61, 127, 251, 509, 761, 1021, 1531, 2039,
|
|
2557, 3067, 3583, 4093, 4603, 5119, 5623, 6143, 6653,
|
|
7159, 7673, 8191, 12281, 16381, 24571, 32749 };
|
|
#define NPRIMES (sizeof(primes) / sizeof(primes[0]))
|
|
|
|
/*
|
|
* General routine to allocate a prime number sized hash table.
|
|
*/
|
|
void *
|
|
phashinit(elements, type, nentries)
|
|
int elements;
|
|
struct malloc_type *type;
|
|
u_long *nentries;
|
|
{
|
|
long hashsize;
|
|
LIST_HEAD(generic, generic) *hashtbl;
|
|
int i;
|
|
|
|
if (elements <= 0)
|
|
panic("phashinit: bad elements");
|
|
for (i = 1, hashsize = primes[1]; hashsize <= elements;) {
|
|
i++;
|
|
if (i == NPRIMES)
|
|
break;
|
|
hashsize = primes[i];
|
|
}
|
|
hashsize = primes[i - 1];
|
|
hashtbl = malloc((u_long)hashsize * sizeof(*hashtbl), type, M_WAITOK);
|
|
for (i = 0; i < hashsize; i++)
|
|
LIST_INIT(&hashtbl[i]);
|
|
*nentries = hashsize;
|
|
return (hashtbl);
|
|
}
|
|
|
|
void
|
|
uio_yield()
|
|
{
|
|
struct thread *td;
|
|
|
|
td = curthread;
|
|
mtx_lock_spin(&sched_lock);
|
|
DROP_GIANT();
|
|
td->td_priority = td->td_ksegrp->kg_user_pri; /* XXXKSE */
|
|
td->td_proc->p_stats->p_ru.ru_nivcsw++;
|
|
mi_switch();
|
|
mtx_unlock_spin(&sched_lock);
|
|
PICKUP_GIANT();
|
|
}
|
|
|
|
int
|
|
copyinfrom(const void *src, void *dst, size_t len, int seg)
|
|
{
|
|
int error = 0;
|
|
|
|
switch (seg) {
|
|
case UIO_USERSPACE:
|
|
error = copyin(src, dst, len);
|
|
break;
|
|
case UIO_SYSSPACE:
|
|
bcopy(src, dst, len);
|
|
break;
|
|
default:
|
|
panic("copyinfrom: bad seg %d\n", seg);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
copyinstrfrom(const void *src, void *dst, size_t len, size_t *copied, int seg)
|
|
{
|
|
int error = 0;
|
|
|
|
switch (seg) {
|
|
case UIO_USERSPACE:
|
|
error = copyinstr(src, dst, len, copied);
|
|
break;
|
|
case UIO_SYSSPACE:
|
|
error = copystr(src, dst, len, copied);
|
|
break;
|
|
default:
|
|
panic("copyinstrfrom: bad seg %d\n", seg);
|
|
}
|
|
return (error);
|
|
}
|