vm_machdep.c revision 255273
136865Sdfr/*- 236865Sdfr * Copyright (c) 1982, 1986 The Regents of the University of California. 336865Sdfr * Copyright (c) 1989, 1990 William Jolitz 436865Sdfr * Copyright (c) 1994 John Dyson 536865Sdfr * All rights reserved. 636865Sdfr * 736865Sdfr * This code is derived from software contributed to Berkeley by 836865Sdfr * the Systems Programming Group of the University of Utah Computer 936865Sdfr * Science Department, and William Jolitz. 1036865Sdfr * 1136865Sdfr * Redistribution and use in source and binary forms, with or without 1236865Sdfr * modification, are permitted provided that the following conditions 1336865Sdfr * are met: 1436865Sdfr * 1. Redistributions of source code must retain the above copyright 1536865Sdfr * notice, this list of conditions and the following disclaimer. 1636865Sdfr * 2. Redistributions in binary form must reproduce the above copyright 1736865Sdfr * notice, this list of conditions and the following disclaimer in the 1836865Sdfr * documentation and/or other materials provided with the distribution. 1936865Sdfr * 3. All advertising materials mentioning features or use of this software 2036865Sdfr * must display the following acknowledgement: 2136865Sdfr * This product includes software developed by the University of 2236865Sdfr * California, Berkeley and its contributors. 2336865Sdfr * 4. Neither the name of the University nor the names of its contributors 2436865Sdfr * may be used to endorse or promote products derived from this software 2536865Sdfr * without specific prior written permission. 2636865Sdfr * 2736865Sdfr * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2836865Sdfr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2936865Sdfr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 3036865Sdfr * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 3136865Sdfr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 3236865Sdfr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3336865Sdfr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3436865Sdfr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3536865Sdfr * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3636865Sdfr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3736865Sdfr * SUCH DAMAGE. 3836865Sdfr * 3936865Sdfr * from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91 4036865Sdfr * Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$ 4150477Speter * $FreeBSD: head/sys/powerpc/aim/vm_machdep.c 255273 2013-09-05 23:00:24Z nwhitehorn $ 4236865Sdfr */ 43139825Simp/*- 4436865Sdfr * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University. 4536865Sdfr * All rights reserved. 4636865Sdfr * 4736865Sdfr * Author: Chris G. Demetriou 48126474Sgrehan * 4936865Sdfr * Permission to use, copy, modify and distribute this software and 5036865Sdfr * its documentation is hereby granted, provided that both the copyright 5136865Sdfr * notice and this permission notice appear in all copies of the 5236865Sdfr * software, derivative works or modified versions, and any portions 5336865Sdfr * thereof, and that both notices appear in supporting documentation. 54126474Sgrehan * 55126474Sgrehan * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 56126474Sgrehan * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 5736865Sdfr * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 58126474Sgrehan * 5936865Sdfr * Carnegie Mellon requests users of this software to return to 6036865Sdfr * 6136865Sdfr * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 6236865Sdfr * School of Computer Science 6336865Sdfr * Carnegie Mellon University 6436865Sdfr * Pittsburgh PA 15213-3890 6536865Sdfr * 6636865Sdfr * any improvements or extensions that they make and grant Carnegie the 6736865Sdfr * rights to redistribute these changes. 6836865Sdfr */ 6936865Sdfr 7036865Sdfr#include <sys/param.h> 7136865Sdfr#include <sys/systm.h> 7236865Sdfr#include <sys/proc.h> 7336865Sdfr#include <sys/malloc.h> 7460041Sphk#include <sys/bio.h> 7536865Sdfr#include <sys/buf.h> 7685201Smp#include <sys/ktr.h> 7785201Smp#include <sys/lock.h> 7867365Sjhb#include <sys/mutex.h> 7936865Sdfr#include <sys/vnode.h> 8036865Sdfr#include <sys/vmmeter.h> 8136865Sdfr#include <sys/kernel.h> 82119563Salc#include <sys/mbuf.h> 83122780Salc#include <sys/sf_buf.h> 8436865Sdfr#include <sys/sysctl.h> 85199135Skib#include <sys/sysent.h> 8654207Speter#include <sys/unistd.h> 8736865Sdfr 8836865Sdfr#include <machine/cpu.h> 8941499Sdfr#include <machine/fpu.h> 9097397Sbenno#include <machine/frame.h> 9136865Sdfr#include <machine/md_var.h> 92138129Sdas#include <machine/pcb.h> 9336865Sdfr 9478342Sbenno#include <dev/ofw/openfirm.h> 9578342Sbenno 9636865Sdfr#include <vm/vm.h> 9736865Sdfr#include <vm/vm_param.h> 9836865Sdfr#include <vm/vm_kern.h> 9936865Sdfr#include <vm/vm_page.h> 10036865Sdfr#include <vm/vm_map.h> 10136865Sdfr#include <vm/vm_extern.h> 10236865Sdfr 10336865Sdfr/* 104190681Snwhitehorn * On systems without a direct mapped region (e.g. PPC64), 105190681Snwhitehorn * we use the same code as the Book E implementation. Since 106190681Snwhitehorn * we need to have runtime detection of this, define some machinery 107190681Snwhitehorn * for sf_bufs in this case, and ignore it on systems with direct maps. 108190681Snwhitehorn */ 109190681Snwhitehorn 110190681Snwhitehorn#ifndef NSFBUFS 111190681Snwhitehorn#define NSFBUFS (512 + maxusers * 16) 112190681Snwhitehorn#endif 113190681Snwhitehorn 114190681Snwhitehornstatic void sf_buf_init(void *arg); 115190681SnwhitehornSYSINIT(sock_sf, SI_SUB_MBUF, SI_ORDER_ANY, sf_buf_init, NULL); 116190681Snwhitehorn 117190681SnwhitehornLIST_HEAD(sf_head, sf_buf); 118190681Snwhitehorn 119190681Snwhitehorn/* A hash table of active sendfile(2) buffers */ 120190681Snwhitehornstatic struct sf_head *sf_buf_active; 121190681Snwhitehornstatic u_long sf_buf_hashmask; 122190681Snwhitehorn 123190681Snwhitehorn#define SF_BUF_HASH(m) (((m) - vm_page_array) & sf_buf_hashmask) 124190681Snwhitehorn 125190681Snwhitehornstatic TAILQ_HEAD(, sf_buf) sf_buf_freelist; 126190681Snwhitehornstatic u_int sf_buf_alloc_want; 127190681Snwhitehorn 128190681Snwhitehorn/* 129190681Snwhitehorn * A lock used to synchronize access to the hash table and free list 130190681Snwhitehorn */ 131190681Snwhitehornstatic struct mtx sf_buf_lock; 132190681Snwhitehorn 133209975Snwhitehorn#ifdef __powerpc64__ 134209975Snwhitehornextern uintptr_t tocbase; 135209975Snwhitehorn#endif 136190681Snwhitehorn 137209975Snwhitehorn 138190681Snwhitehorn/* 13936865Sdfr * Finish a fork operation, with process p2 nearly set up. 14036865Sdfr * Copy and update the pcb, set up the stack so that the child 14136865Sdfr * ready to run and return to user mode. 14236865Sdfr */ 14336865Sdfrvoid 14490361Sjuliancpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags) 14536865Sdfr{ 14684977Sbenno struct trapframe *tf; 14784977Sbenno struct callframe *cf; 14890643Sbenno struct pcb *pcb; 14984977Sbenno 15091467Sbenno KASSERT(td1 == curthread || td1 == &thread0, 15190643Sbenno ("cpu_fork: p1 not curproc and not proc0")); 152209975Snwhitehorn CTR3(KTR_PROC, "cpu_fork: called td1=%p p2=%p flags=%x", 153209975Snwhitehorn td1, p2, flags); 15484977Sbenno 15584977Sbenno if ((flags & RFPROC) == 0) 15684977Sbenno return; 15784977Sbenno 158127582Speter pcb = (struct pcb *)((td2->td_kstack + 159209975Snwhitehorn td2->td_kstack_pages * PAGE_SIZE - sizeof(struct pcb)) & ~0x2fUL); 16090643Sbenno td2->td_pcb = pcb; 16184977Sbenno 16290643Sbenno /* Copy the pcb */ 16390643Sbenno bcopy(td1->td_pcb, pcb, sizeof(struct pcb)); 16484977Sbenno 16584977Sbenno /* 16690643Sbenno * Create a fresh stack for the new process. 16784977Sbenno * Copy the trap frame for the return to user mode as if from a 16884977Sbenno * syscall. This copies most of the user mode register values. 16984977Sbenno */ 17090643Sbenno tf = (struct trapframe *)pcb - 1; 17190643Sbenno bcopy(td1->td_frame, tf, sizeof(*tf)); 17284977Sbenno 17397397Sbenno /* Set up trap frame. */ 17497397Sbenno tf->fixreg[FIRSTARG] = 0; 17597397Sbenno tf->fixreg[FIRSTARG + 1] = 0; 17697397Sbenno tf->cr &= ~0x10000000; 17790643Sbenno 17890643Sbenno td2->td_frame = tf; 17990643Sbenno 18090643Sbenno cf = (struct callframe *)tf - 1; 181132520Sgrehan memset(cf, 0, sizeof(struct callframe)); 182209975Snwhitehorn #ifdef __powerpc64__ 183209975Snwhitehorn cf->cf_toc = tocbase; 184209975Snwhitehorn #endif 18591467Sbenno cf->cf_func = (register_t)fork_return; 18691467Sbenno cf->cf_arg0 = (register_t)td2; 18791467Sbenno cf->cf_arg1 = (register_t)tf; 18884977Sbenno 18991467Sbenno pcb->pcb_sp = (register_t)cf; 190255273Snwhitehorn KASSERT(pcb->pcb_sp % 16 == 0, ("stack misaligned")); 191209975Snwhitehorn #ifdef __powerpc64__ 192209975Snwhitehorn pcb->pcb_lr = ((register_t *)fork_trampoline)[0]; 193209975Snwhitehorn pcb->pcb_toc = ((register_t *)fork_trampoline)[1]; 194209975Snwhitehorn #else 19591467Sbenno pcb->pcb_lr = (register_t)fork_trampoline; 196209975Snwhitehorn #endif 197209975Snwhitehorn pcb->pcb_cpu.aim.usr_vsid = 0; 19884977Sbenno 199170305Sjeff /* Setup to release spin count in fork_exit(). */ 200144637Sjhb td2->td_md.md_spinlock_count = 1; 201144637Sjhb td2->td_md.md_saved_msr = PSL_KERNSET; 202144637Sjhb 20390643Sbenno /* 20490643Sbenno * Now cpu_switch() can schedule the new process. 20590643Sbenno */ 20636865Sdfr} 20736865Sdfr 20836865Sdfr/* 20936865Sdfr * Intercept the return address from a freshly forked process that has NOT 21036865Sdfr * been scheduled yet. 21136865Sdfr * 21236865Sdfr * This is needed to make kernel threads stay in kernel mode. 21336865Sdfr */ 21436865Sdfrvoid 21583682Smpcpu_set_fork_handler(td, func, arg) 21683682Smp struct thread *td; 21792842Salfred void (*func)(void *); 21848391Speter void *arg; 21936865Sdfr{ 22084977Sbenno struct callframe *cf; 22184977Sbenno 222209975Snwhitehorn CTR4(KTR_PROC, "%s called with td=%p func=%p arg=%p", 223209975Snwhitehorn __func__, td, func, arg); 22484977Sbenno 22591467Sbenno cf = (struct callframe *)td->td_pcb->pcb_sp; 22684977Sbenno 22791467Sbenno cf->cf_func = (register_t)func; 22891467Sbenno cf->cf_arg0 = (register_t)arg; 22936865Sdfr} 23036865Sdfr 23136865Sdfrvoid 23283682Smpcpu_exit(td) 23383682Smp register struct thread *td; 23436865Sdfr{ 23536865Sdfr} 23636865Sdfr 23736865Sdfr/* 238190681Snwhitehorn * Allocate a pool of sf_bufs (sendfile(2) or "super-fast" if you prefer. :-)) 239119563Salc */ 240190681Snwhitehornstatic void 241190681Snwhitehornsf_buf_init(void *arg) 242190681Snwhitehorn{ 243190681Snwhitehorn struct sf_buf *sf_bufs; 244190681Snwhitehorn vm_offset_t sf_base; 245190681Snwhitehorn int i; 246190681Snwhitehorn 247190681Snwhitehorn /* Don't bother on systems with a direct map */ 248190681Snwhitehorn 249190681Snwhitehorn if (hw_direct_map) 250190681Snwhitehorn return; 251190681Snwhitehorn 252190681Snwhitehorn nsfbufs = NSFBUFS; 253190681Snwhitehorn TUNABLE_INT_FETCH("kern.ipc.nsfbufs", &nsfbufs); 254190681Snwhitehorn 255190681Snwhitehorn sf_buf_active = hashinit(nsfbufs, M_TEMP, &sf_buf_hashmask); 256190681Snwhitehorn TAILQ_INIT(&sf_buf_freelist); 257254025Sjeff sf_base = kva_alloc(nsfbufs * PAGE_SIZE); 258190681Snwhitehorn sf_bufs = malloc(nsfbufs * sizeof(struct sf_buf), M_TEMP, M_NOWAIT | M_ZERO); 259190681Snwhitehorn 260190681Snwhitehorn for (i = 0; i < nsfbufs; i++) { 261190681Snwhitehorn sf_bufs[i].kva = sf_base + i * PAGE_SIZE; 262190681Snwhitehorn TAILQ_INSERT_TAIL(&sf_buf_freelist, &sf_bufs[i], free_entry); 263190681Snwhitehorn } 264190681Snwhitehorn sf_buf_alloc_want = 0; 265190681Snwhitehorn mtx_init(&sf_buf_lock, "sf_buf", NULL, MTX_DEF); 266190681Snwhitehorn} 267190681Snwhitehorn 268190681Snwhitehorn/* 269190681Snwhitehorn * Get an sf_buf from the freelist. Will block if none are available. 270190681Snwhitehorn */ 271119563Salcstruct sf_buf * 272190681Snwhitehornsf_buf_alloc(struct vm_page *m, int flags) 273119563Salc{ 274190681Snwhitehorn struct sf_head *hash_list; 275190681Snwhitehorn struct sf_buf *sf; 276190681Snwhitehorn int error; 277119563Salc 278190681Snwhitehorn if (hw_direct_map) { 279190681Snwhitehorn /* Shortcut the direct mapped case */ 280190681Snwhitehorn 281190681Snwhitehorn return ((struct sf_buf *)m); 282190681Snwhitehorn } 283190681Snwhitehorn 284190681Snwhitehorn hash_list = &sf_buf_active[SF_BUF_HASH(m)]; 285190681Snwhitehorn mtx_lock(&sf_buf_lock); 286190681Snwhitehorn LIST_FOREACH(sf, hash_list, list_entry) { 287190681Snwhitehorn if (sf->m == m) { 288190681Snwhitehorn sf->ref_count++; 289190681Snwhitehorn if (sf->ref_count == 1) { 290190681Snwhitehorn TAILQ_REMOVE(&sf_buf_freelist, sf, free_entry); 291190681Snwhitehorn nsfbufsused++; 292190681Snwhitehorn nsfbufspeak = imax(nsfbufspeak, nsfbufsused); 293190681Snwhitehorn } 294190681Snwhitehorn goto done; 295190681Snwhitehorn } 296190681Snwhitehorn } 297190681Snwhitehorn 298190681Snwhitehorn while ((sf = TAILQ_FIRST(&sf_buf_freelist)) == NULL) { 299190681Snwhitehorn if (flags & SFB_NOWAIT) 300190681Snwhitehorn goto done; 301190681Snwhitehorn 302190681Snwhitehorn sf_buf_alloc_want++; 303253351Sae SFSTAT_INC(sf_allocwait); 304190681Snwhitehorn error = msleep(&sf_buf_freelist, &sf_buf_lock, 305190681Snwhitehorn (flags & SFB_CATCH) ? PCATCH | PVM : PVM, "sfbufa", 0); 306190681Snwhitehorn sf_buf_alloc_want--; 307190681Snwhitehorn 308190681Snwhitehorn /* 309190681Snwhitehorn * If we got a signal, don't risk going back to sleep. 310190681Snwhitehorn */ 311190681Snwhitehorn if (error) 312190681Snwhitehorn goto done; 313190681Snwhitehorn } 314190681Snwhitehorn 315190681Snwhitehorn TAILQ_REMOVE(&sf_buf_freelist, sf, free_entry); 316190681Snwhitehorn if (sf->m != NULL) 317190681Snwhitehorn LIST_REMOVE(sf, list_entry); 318190681Snwhitehorn 319190681Snwhitehorn LIST_INSERT_HEAD(hash_list, sf, list_entry); 320190681Snwhitehorn sf->ref_count = 1; 321190681Snwhitehorn sf->m = m; 322190681Snwhitehorn nsfbufsused++; 323190681Snwhitehorn nsfbufspeak = imax(nsfbufspeak, nsfbufsused); 324190681Snwhitehorn pmap_qenter(sf->kva, &sf->m, 1); 325190681Snwhitehorndone: 326190681Snwhitehorn mtx_unlock(&sf_buf_lock); 327190681Snwhitehorn return (sf); 328119563Salc} 329119563Salc 330119563Salc/* 331190681Snwhitehorn * Detatch mapped page and release resources back to the system. 332190681Snwhitehorn * 333190681Snwhitehorn * Remove a reference from the given sf_buf, adding it to the free 334190681Snwhitehorn * list when its reference count reaches zero. A freed sf_buf still, 335190681Snwhitehorn * however, retains its virtual-to-physical mapping until it is 336190681Snwhitehorn * recycled or reactivated by sf_buf_alloc(9). 337119563Salc */ 338119563Salcvoid 339127086Salcsf_buf_free(struct sf_buf *sf) 340119563Salc{ 341190681Snwhitehorn if (hw_direct_map) 342190681Snwhitehorn return; 343190681Snwhitehorn 344190681Snwhitehorn mtx_lock(&sf_buf_lock); 345190681Snwhitehorn sf->ref_count--; 346190681Snwhitehorn if (sf->ref_count == 0) { 347190681Snwhitehorn TAILQ_INSERT_TAIL(&sf_buf_freelist, sf, free_entry); 348190681Snwhitehorn nsfbufsused--; 349190681Snwhitehorn 350190681Snwhitehorn if (sf_buf_alloc_want > 0) 351217561Skib wakeup(&sf_buf_freelist); 352190681Snwhitehorn } 353190681Snwhitehorn mtx_unlock(&sf_buf_lock); 354119563Salc} 355119563Salc 356119563Salc/* 35736865Sdfr * Software interrupt handler for queued VM system processing. 358126474Sgrehan */ 359126474Sgrehanvoid 360126474Sgrehanswi_vm(void *dummy) 361126474Sgrehan{ 362209950Snwhitehorn 36336865Sdfr if (busdma_swi_pending != 0) 36436865Sdfr busdma_swi(); 36536865Sdfr} 36636865Sdfr 36736865Sdfr/* 36836865Sdfr * Tell whether this address is in some physical memory region. 36936865Sdfr * Currently used by the kernel coredump code in order to avoid 37036865Sdfr * dumping the ``ISA memory hole'' which could cause indefinite hangs, 37136865Sdfr * or other unpredictable behaviour. 37236865Sdfr */ 37336865Sdfr 37436865Sdfr 37536865Sdfrint 37636865Sdfris_physical_memory(addr) 37736865Sdfr vm_offset_t addr; 37836865Sdfr{ 37936865Sdfr /* 38036865Sdfr * stuff other tests for known memory-mapped devices (PCI?) 38136865Sdfr * here 38236865Sdfr */ 38336865Sdfr 38436865Sdfr return 1; 38536865Sdfr} 38699659Sbenno 38799659Sbenno/* 388209975Snwhitehorn * CPU threading functions related to the VM layer. These could be used 389209975Snwhitehorn * to map the SLB bits required for the kernel stack instead of forcing a 390209975Snwhitehorn * fixed-size KVA. 39199659Sbenno */ 39299659Sbenno 39399659Sbennovoid 394119004Smarcelcpu_thread_swapin(struct thread *td) 395119004Smarcel{ 39699659Sbenno} 39799659Sbenno 39899659Sbennovoid 399119004Smarcelcpu_thread_swapout(struct thread *td) 400119004Smarcel{ 401119004Smarcel} 402119004Smarcel 403