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Make sure vunmapbuf will kmem_free_wakeup() the same VA range 

that came from kmem_alloc_wait().  (Same problem as PR#4120).
This commit is contained in:
gwr 1997-10-18 00:17:21 +00:00
parent 8bb9a1ccb2
commit c5b23be7bf
1 changed files with 53 additions and 43 deletions
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96
sys/arch/sparc/sparc/vm_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.31 1997/09/27 17:49:33 pk Exp $ */
/* $NetBSD: vm_machdep.c,v 1.32 1997/10/18 00:17:21 gwr Exp $ */
/*
* Copyright (c) 1996
@ -294,71 +294,81 @@ dvma_mapout(kva, va, len)
/*
* Map an IO request into kernel virtual address space.
*/
/*ARGSUSED*/
void
vmapbuf(bp, sz)
register struct buf *bp;
vm_size_t sz;
vmapbuf(bp, len)
struct buf *bp;
vm_size_t len;
{
register vm_offset_t addr, kva, pa;
register vm_size_t size, off;
register int npf;
struct proc *p;
register struct vm_map *map;
struct pmap *upmap, *kpmap;
vm_offset_t uva; /* User VA (map from) */
vm_offset_t kva; /* Kernel VA (new to) */
vm_offset_t pa; /* physical address */
vm_size_t off;
if ((bp->b_flags & B_PHYS) == 0)
panic("vmapbuf");
p = bp->b_proc;
map = &p->p_vmspace->vm_map;
bp->b_saveaddr = bp->b_data;
addr = (vm_offset_t)bp->b_saveaddr;
off = addr & PGOFSET;
size = round_page(bp->b_bcount + off);
kva = kmem_alloc_wait(kernel_map, size);
bp->b_data = (caddr_t)(kva + off);
addr = trunc_page(addr);
npf = btoc(size);
while (npf--) {
pa = pmap_extract(vm_map_pmap(map), (vm_offset_t)addr);
if (pa == 0)
panic("vmapbuf: null page frame");
/*
* pmap_enter distributes this mapping to all
* contexts... maybe we should avoid this extra work
* XXX: It might be better to round/trunc to a
* segment boundary to avoid VAC problems!
*/
pmap_enter(pmap_kernel(), kva,
pa | PMAP_NC,
VM_PROT_READ|VM_PROT_WRITE, 1);
bp->b_saveaddr = bp->b_data;
uva = trunc_page(bp->b_data);
off = (vm_offset_t)bp->b_data - uva;
len = round_page(off + len);
kva = kmem_alloc_wait(kernel_map, len);
bp->b_data = (caddr_t)(kva + off);
addr += PAGE_SIZE;
/*
* We have to flush any write-back cache on the
* user-space mappings so our new mappings will
* have the correct contents.
*/
if (CACHEINFO.c_vactype != VAC_NONE)
cpuinfo.cache_flush((caddr_t)uva, len);
upmap = vm_map_pmap(&bp->b_proc->p_vmspace->vm_map);
kpmap = vm_map_pmap(kernel_map);
do {
pa = pmap_extract(upmap, uva);
if (pa == 0)
panic("vmapbuf: null page frame");
/* Now map the page into kernel space. */
pmap_enter(kpmap, kva, pa | PMAP_NC,
VM_PROT_READ|VM_PROT_WRITE, TRUE);
uva += PAGE_SIZE;
kva += PAGE_SIZE;
}
len -= PAGE_SIZE;
} while (len);
}
/*
* Free the io map addresses associated with this IO operation.
* Free the mappings associated with this I/O operation.
*/
/*ARGSUSED*/
void
vunmapbuf(bp, sz)
register struct buf *bp;
vm_size_t sz;
vunmapbuf(bp, len)
struct buf *bp;
vm_size_t len;
{
register vm_offset_t kva = (vm_offset_t)bp->b_data;
register vm_size_t size, off;
vm_offset_t kva;
vm_size_t off;
if ((bp->b_flags & B_PHYS) == 0)
panic("vunmapbuf");
kva = (vm_offset_t)bp->b_data;
off = kva & PGOFSET;
size = round_page(bp->b_bcount + off);
kmem_free_wakeup(kernel_map, trunc_page(kva), size);
kva = trunc_page(bp->b_data);
off = (vm_offset_t)bp->b_data - kva;
len = round_page(off + len);
/* This will call pmap_remove() for us. */
kmem_free_wakeup(kernel_map, kva, len);
bp->b_data = bp->b_saveaddr;
bp->b_saveaddr = NULL;
#if 0 /* XXX: The flush above is sufficient, right? */
if (CACHEINFO.c_vactype != VAC_NONE)
cpuinfo.cache_flush(bp->b_un.b_addr, bp->b_bcount - bp->b_resid);
cpuinfo.cache_flush(bp->b_data, len);
#endif
}