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[POWERPC] Make IOMMU code safe for > 132 GB of memory

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Currently the IOMMU code allocates one page for the segment table, that
isn't safe if we have more than 132 GB of RAM.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Acked-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Michael Ellerman 2008-01-21 18:01:43 +11:00 committed by Paul Mackerras
parent bd83fbde5b
commit 3ca6644e5c
1 changed files with 4 additions and 3 deletions
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7
arch/powerpc/platforms/cell/iommu.c
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@ -310,8 +310,8 @@ static void cell_iommu_setup_hardware(struct cbe_iommu *iommu, unsigned long siz
{
struct page *page;
int ret, i;
unsigned long reg, segments, pages_per_segment, ptab_size, n_pte_pages;
unsigned long xlate_base;
unsigned long reg, segments, pages_per_segment, ptab_size, stab_size,
n_pte_pages, xlate_base;
unsigned int virq;
if (cell_iommu_find_ioc(iommu->nid, &xlate_base))
@ -328,7 +328,8 @@ static void cell_iommu_setup_hardware(struct cbe_iommu *iommu, unsigned long siz
__FUNCTION__, iommu->nid, segments, pages_per_segment);
/* set up the segment table */
page = alloc_pages_node(iommu->nid, GFP_KERNEL, 0);
stab_size = segments * sizeof(unsigned long);
page = alloc_pages_node(iommu->nid, GFP_KERNEL, get_order(stab_size));
BUG_ON(!page);
iommu->stab = page_address(page);
clear_page(iommu->stab);