From 11b83888ae729457b5cfb936dbd498481f6408df Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Tue, 19 May 2009 10:23:15 +0200 Subject: [PATCH] amd-iommu: enlarge the aperture dynamically By dynamically increasing the aperture the extended allocator is now ready for use. Signed-off-by: Joerg Roedel --- arch/x86/kernel/amd_iommu.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index 59ee1b9..d129d8f 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -1403,10 +1403,26 @@ static dma_addr_t __map_single(struct device *dev, if (align) align_mask = (1UL << get_order(size)) - 1; +retry: address = dma_ops_alloc_addresses(dev, dma_dom, pages, align_mask, dma_mask); - if (unlikely(address == bad_dma_address)) - goto out; + if (unlikely(address == bad_dma_address)) { + /* + * setting next_address here will let the address + * allocator only scan the new allocated range in the + * first run. This is a small optimization. + */ + dma_dom->next_address = dma_dom->aperture_size; + + if (alloc_new_range(iommu, dma_dom, false, GFP_ATOMIC)) + goto out; + + /* + * aperture was sucessfully enlarged by 128 MB, try + * allocation again + */ + goto retry; + } start = address; for (i = 0; i < pages; ++i) { -- 1.8.2.3