256 lines
6.5 KiB
C
256 lines
6.5 KiB
C
/*-
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* Copyright (c) 1997, Duke University
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* All rights reserved.
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*
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* Author:
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* Andrew Gallatin <gallatin@cs.duke.edu>
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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. The name of Duke University may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY DUKE UNIVERSITY ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DUKE UNIVERSITY BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITSOR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* This is a set of routines for allocating large-sized mbuf payload
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* areas, and is primarily intended for use in receive side mbuf
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* allocation.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/types.h>
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#include <sys/sockio.h>
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#include <sys/uio.h>
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#include <sys/lock.h>
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#include <sys/kernel.h>
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#include <sys/mutex.h>
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#include <sys/malloc.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_map.h>
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#include <vm/vm_param.h>
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#include <vm/vm_pageout.h>
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#include <sys/vmmeter.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_kern.h>
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#include <sys/proc.h>
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#include <sys/jumbo.h>
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/*
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* XXX this may be too high or too low.
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*/
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#define JUMBO_MAX_PAGES 3072
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struct jumbo_kmap {
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vm_offset_t kva;
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SLIST_ENTRY(jumbo_kmap) entries; /* Singly-linked List. */
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};
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static SLIST_HEAD(jumbo_kmap_head, jumbo_kmap) jumbo_kmap_free,
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jumbo_kmap_inuse;
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static struct mtx jumbo_mutex;
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MTX_SYSINIT(jumbo_lock, &jumbo_mutex, "jumbo mutex", MTX_DEF);
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static struct vm_object *jumbo_vm_object;
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static unsigned long jumbo_vmuiomove_pgs_freed = 0;
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#if 0
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static int jumbo_vm_wakeup_wanted = 0;
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#endif
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vm_offset_t jumbo_basekva;
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int
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jumbo_vm_init(void)
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{
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int i;
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struct jumbo_kmap *entry;
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mtx_lock(&jumbo_mutex);
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if (jumbo_vm_object != NULL) {
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mtx_unlock(&jumbo_mutex);
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return (1);
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}
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/* allocate our object */
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jumbo_vm_object = vm_object_allocate_wait(OBJT_DEFAULT, JUMBO_MAX_PAGES,
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M_NOWAIT);
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if (jumbo_vm_object == NULL) {
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mtx_unlock(&jumbo_mutex);
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return (0);
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}
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SLIST_INIT(&jumbo_kmap_free);
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SLIST_INIT(&jumbo_kmap_inuse);
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/* grab some kernel virtual address space */
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jumbo_basekva = kmem_alloc_pageable(kernel_map,
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PAGE_SIZE * JUMBO_MAX_PAGES);
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if (jumbo_basekva == 0) {
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vm_object_deallocate(jumbo_vm_object);
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jumbo_vm_object = NULL;
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mtx_unlock(&jumbo_mutex);
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return 0;
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}
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for (i = 0; i < JUMBO_MAX_PAGES; i++) {
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entry = malloc(sizeof(struct jumbo_kmap), M_TEMP, M_NOWAIT);
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if (!entry && !i) {
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mtx_unlock(&jumbo_mutex);
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panic("jumbo_vm_init: unable to allocated kvas");
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} else if (!entry) {
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printf("warning: jumbo_vm_init allocated only %d kva\n",
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i);
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mtx_unlock(&jumbo_mutex);
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return 1;
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}
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entry->kva = jumbo_basekva + (vm_offset_t)i * PAGE_SIZE;
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SLIST_INSERT_HEAD(&jumbo_kmap_free, entry, entries);
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}
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mtx_unlock(&jumbo_mutex);
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return 1;
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}
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void
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jumbo_freem(void *addr, void *args)
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{
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vm_page_t frame;
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frame = PHYS_TO_VM_PAGE(pmap_kextract((vm_offset_t)addr));
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/*
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* Need giant for looking at the hold count below. Convert this
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* to the vm mutex once the VM code has been moved out from under
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* giant.
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*/
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GIANT_REQUIRED;
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if (frame->hold_count == 0)
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jumbo_pg_free((vm_offset_t)addr);
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else
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printf("jumbo_freem: hold count for %p is %d!!??\n",
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frame, frame->hold_count);
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}
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void
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jumbo_pg_steal(vm_page_t pg)
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{
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vm_offset_t addr;
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struct jumbo_kmap *entry;
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addr = ptoa(pg->pindex) + jumbo_basekva;
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if (pg->object != jumbo_vm_object)
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panic("stealing a non jumbo_vm_object page");
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vm_page_remove(pg);
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mtx_lock(&jumbo_mutex);
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pmap_qremove(addr,1);
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entry = SLIST_FIRST(&jumbo_kmap_inuse);
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entry->kva = addr;
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SLIST_REMOVE_HEAD(&jumbo_kmap_inuse, entries);
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SLIST_INSERT_HEAD(&jumbo_kmap_free, entry, entries);
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mtx_unlock(&jumbo_mutex);
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#if 0
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if (jumbo_vm_wakeup_wanted)
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wakeup(jumbo_vm_object);
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#endif
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}
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vm_page_t
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jumbo_pg_alloc(void)
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{
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vm_page_t pg;
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vm_pindex_t pindex;
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struct jumbo_kmap *entry;
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pg = NULL;
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mtx_lock(&jumbo_mutex);
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entry = SLIST_FIRST(&jumbo_kmap_free);
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if (entry != NULL){
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pindex = atop(entry->kva - jumbo_basekva);
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VM_OBJECT_LOCK(jumbo_vm_object);
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pg = vm_page_alloc(jumbo_vm_object, pindex, VM_ALLOC_INTERRUPT);
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VM_OBJECT_UNLOCK(jumbo_vm_object);
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if (pg != NULL) {
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SLIST_REMOVE_HEAD(&jumbo_kmap_free, entries);
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SLIST_INSERT_HEAD(&jumbo_kmap_inuse, entry, entries);
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pmap_qenter(entry->kva, &pg, 1);
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}
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}
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mtx_unlock(&jumbo_mutex);
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return(pg);
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}
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void
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jumbo_pg_free(vm_offset_t addr)
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{
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struct jumbo_kmap *entry;
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vm_paddr_t paddr;
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vm_page_t pg;
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paddr = pmap_kextract((vm_offset_t)addr);
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pg = PHYS_TO_VM_PAGE(paddr);
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VM_OBJECT_LOCK(jumbo_vm_object);
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if (pg->object != jumbo_vm_object) {
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jumbo_vmuiomove_pgs_freed++;
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/* if(vm_page_lookup(jumbo_vm_object, atop(addr - jumbo_basekva)))
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panic("vm_page_rename didn't");
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printf("freeing uiomoved pg:\t pindex = %d, padd = 0x%lx\n",
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atop(addr - jumbo_basekva), paddr);
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*/
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} else {
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vm_page_lock_queues();
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vm_page_busy(pg); /* vm_page_free wants pages to be busy*/
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vm_page_free(pg);
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vm_page_unlock_queues();
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}
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VM_OBJECT_UNLOCK(jumbo_vm_object);
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mtx_lock(&jumbo_mutex);
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pmap_qremove(addr,1);
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entry = SLIST_FIRST(&jumbo_kmap_inuse);
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entry->kva = addr;
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SLIST_REMOVE_HEAD(&jumbo_kmap_inuse, entries);
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SLIST_INSERT_HEAD(&jumbo_kmap_free, entry, entries);
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mtx_unlock(&jumbo_mutex);
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#if 0
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if (jumbo_vm_wakeup_wanted)
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wakeup(jumbo_vm_object);
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#endif
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}
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