From 3d3e6da17d6af42a3fd4891fb09d93dca002e590 Mon Sep 17 00:00:00 2001 From: Michael Ellerman Date: Fri, 29 Feb 2008 18:33:26 +1100 Subject: [PATCH] [POWERPC] Cell IOMMU: n_pte_pages is in 4K page units, not IOMMU_PAGE_SIZE We use n_pte_pages to calculate the stride through the page tables, but we also use it to set the NPPT value in the segment table entry. That is defined as the number of 4K pages per segment, so we should calculate it as such regardless of the IOMMU page size. Signed-off-by: Michael Ellerman Signed-off-by: Arnd Bergmann --- arch/powerpc/platforms/cell/iommu.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/arch/powerpc/platforms/cell/iommu.c b/arch/powerpc/platforms/cell/iommu.c index 187a723..7a861cb 100644 --- a/arch/powerpc/platforms/cell/iommu.c +++ b/arch/powerpc/platforms/cell/iommu.c @@ -348,9 +348,8 @@ static unsigned long *cell_iommu_alloc_ptab(struct cbe_iommu *iommu, ptab = page_address(page); memset(ptab, 0, ptab_size); - /* number of pages needed for a page table */ - n_pte_pages = (pages_per_segment * - sizeof(unsigned long)) >> IOMMU_PAGE_SHIFT; + /* number of 4K pages needed for a page table */ + n_pte_pages = (pages_per_segment * sizeof(unsigned long)) >> 12; pr_debug("%s: iommu[%d]: stab at %p, ptab at %p, n_pte_pages: %lu\n", __FUNCTION__, iommu->nid, iommu->stab, ptab, @@ -377,8 +376,8 @@ static unsigned long *cell_iommu_alloc_ptab(struct cbe_iommu *iommu, pr_debug("\toverlap at %d, skipping\n", i); continue; } - iommu->stab[i] = reg | (__pa(ptab) + n_pte_pages * - IOMMU_PAGE_SIZE * (i - start_seg)); + iommu->stab[i] = reg | (__pa(ptab) + (n_pte_pages << 12) * + (i - start_seg)); pr_debug("\t[%d] 0x%016lx\n", i, iommu->stab[i]); } -- 2.7.4