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>

diff --git a/arch/alpha/kernel/pci_iommu.c b/arch/alpha/kernel/pci_iommu.c
index bbf9990cd2380a6cd9d810986adf944135abf411..e54f829528cb995d5d368f6d018e8a4249ff0d96 100644 (file)
--- a/arch/alpha/kernel/pci_iommu.c
+++ b/arch/alpha/kernel/pci_iommu.c
@@ -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);
-
-               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
                        return -1;
        }