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alpha: IOMMU had better access to the free space bitmap at only one place 

iommu_arena_find_pages duplicates the code to access to the bitmap for free
space management.  This patch convert the IOMMU code to have only one place to
access the bitmap, in the popular way that other IOMMUs (e.g.  POWER and
SPARC) do.

This patch is preparation for modifications to fix the IOMMU segment boundary
problem.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
FUJITA Tomonori 2008-03-04 14:28:57 -08:00 committed by Linus Torvalds
parent 3c5f1def7d
commit 23d7e0390a
1 changed files with 14 additions and 12 deletions
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26
arch/alpha/kernel/pci_iommu.c
View File

@ -132,12 +132,15 @@ iommu_arena_find_pages(struct pci_iommu_arena *arena, long n, long mask)
{
unsigned long *ptes;
long i, p, nent;
int pass = 0;
/* Search forward for the first mask-aligned sequence of N free ptes */
ptes = arena->ptes;
nent = arena->size >> PAGE_SHIFT;
p = ALIGN(arena->next_entry, mask + 1);
i = 0;
again:
while (i < n && p+i < nent) {
if (ptes[p+i])
p = ALIGN(p + i + 1, mask + 1), i = 0;
@ -146,19 +149,18 @@ iommu_arena_find_pages(struct pci_iommu_arena *arena, long n, long mask)
}
if (i < n) {
/* Reached the end. Flush the TLB and restart the
search from the beginning. */
alpha_mv.mv_pci_tbi(arena->hose, 0, -1);
if (pass < 1) {
/*
* Reached the end. Flush the TLB and restart
* the search from the beginning.
*/
alpha_mv.mv_pci_tbi(arena->hose, 0, -1);
p = 0, i = 0;
while (i < n && p+i < nent) {
if (ptes[p+i])
p = ALIGN(p + i + 1, mask + 1), i = 0;
else
i = i + 1;
}
if (i < n)
pass++;
p = 0;
i = 0;
goto again;
} else
return -1;
}