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Makes contigalloc[1]() create the vm_map / underlying wired pages in the

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kernel map and object in a manner that contigfree() is actually able to
free.  Previously contigfree() freed up the KVA space but could not
unwire & free the underlying VM pages due to mismatched pageability between
the map entry and the VM pages.

Submitted by:	Thomas Moestl <tmoestl@gmx.net>
Testing by: mark tinguely <tinguely@web.cs.ndsu.nodak.edu>
MFC after:	3 days
This commit is contained in:
Matthew Dillon 2001-10-13 04:23:37 +00:00
parent 21eff82f63
commit 33bd457d91
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=84869
1 changed files with 12 additions and 4 deletions
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16
sys/vm/vm_contig.c
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@ -76,6 +76,8 @@
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_kern.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
#include <vm/vm_pageout.h>
@ -232,7 +234,6 @@ contigmalloc1(
m->busy = 0;
m->queue = PQ_NONE;
m->object = NULL;
vm_page_wire(m);
}
/*
@ -240,24 +241,31 @@ contigmalloc1(
* Allocate kernel VM, unfree and assign the physical pages to it and
* return kernel VM pointer.
*/
tmp_addr = addr = kmem_alloc_pageable(map, size);
if (addr == 0) {
vm_map_lock(map);
if (vm_map_findspace(map, vm_map_min(map), size, &addr) !=
KERN_SUCCESS) {
/*
* XXX We almost never run out of kernel virtual
* space, so we don't make the allocated memory
* above available.
*/
vm_map_unlock(map);
splx(s);
return (NULL);
}
vm_object_reference(kernel_object);
vm_map_insert(map, kernel_object, addr - VM_MIN_KERNEL_ADDRESS,
addr, addr + size, VM_PROT_ALL, VM_PROT_ALL, 0);
vm_map_unlock(map);
tmp_addr = addr;
for (i = start; i < (start + size / PAGE_SIZE); i++) {
vm_page_t m = &pga[i];
vm_page_insert(m, kernel_object,
OFF_TO_IDX(tmp_addr - VM_MIN_KERNEL_ADDRESS));
pmap_kenter(tmp_addr, VM_PAGE_TO_PHYS(m));
tmp_addr += PAGE_SIZE;
}
vm_map_pageable(map, addr, addr + size, FALSE);
splx(s);
return ((void *)addr);