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x86, swiotlb: Simplify SWIOTLB pci_swiotlb_detect routine.

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In 'pci_swiotlb_detect' we used to do two different things:
 a). If user provided 'iommu=soft' or 'swiotlb=force' we
     would set swiotlb=1 and return 1 (and forcing pci-dma.c
     to call pci_swiotlb_init() immediately).
 b). If 4GB or more would be detected and if user did not specify
     iommu=off, we would set 'swiotlb=1' and return whatever 'a)'
     figured out.

We simplify this by splitting a) and b) in two different routines.

CC: Fujita Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
LKML-Reference: <1282845485-8991-5-git-send-email-konrad.wilk@oracle.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Konrad Rzeszutek Wilk
2010-08-26 13:57:59 -04:00
committed by H. Peter Anvin
parent 5bef80a4b8
commit efa631c26d
4 changed files with 43 additions and 11 deletions
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4
arch/x86/include/asm/iommu_table.h
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@@ -64,10 +64,10 @@ struct iommu_table_entry {
* to stop detecting the other IOMMUs after yours has been detected.
*/
#define IOMMU_INIT_POST(_detect) \
__IOMMU_INIT(_detect, pci_swiotlb_detect, 0, 0, 0)
__IOMMU_INIT(_detect, pci_swiotlb_detect_4gb, 0, 0, 0)
#define IOMMU_INIT_POST_FINISH(detect) \
__IOMMU_INIT(_detect, pci_swiotlb_detect, 0, 0, 1)
__IOMMU_INIT(_detect, pci_swiotlb_detect_4gb, 0, 0, 1)
/*
* A more sophisticated version of IOMMU_INIT. This variant requires: