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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2008-03-04 14:28:57 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-03-04 16:35:14 -0800
commit23d7e0390ab57cf15a5cfe8d6806192f0997e5a8 (patch)
tree8e812d880912e2034513cc1cdb3deb3e2cefb374 /arch/alpha/kernel/pci_iommu.c
parent3c5f1def7dd50b792f56dcf7378c2684c06947f3 (diff)
downloadvexpress-lsk-23d7e0390ab57cf15a5cfe8d6806192f0997e5a8.tar.gz
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>
Diffstat (limited to 'arch/alpha/kernel/pci_iommu.c')
-rw-r--r--arch/alpha/kernel/pci_iommu.c28
1 files changed, 15 insertions, 13 deletions
diff --git a/arch/alpha/kernel/pci_iommu.c b/arch/alpha/kernel/pci_iommu.c
index bbf9990cd23..e54f829528c 100644
--- 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;
}