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>
{
unsigned long *ptes;
long i, p, nent;
{
unsigned long *ptes;
long i, p, nent;
/* 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;
/* 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;
while (i < n && p+i < nent) {
if (ptes[p+i])
p = ALIGN(p + i + 1, mask + 1), i = 0;
while (i < n && p+i < nent) {
if (ptes[p+i])
p = ALIGN(p + i + 1, mask + 1), i = 0;
- /* 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)
+ 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);
+
+ pass++;
+ p = 0;
+ i = 0;
+ goto again;
+ } else