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IA64: fix VT-d dma_mapping_error 

dma_mapping_error is used to see if dma_map_single and dma_map_page
succeed. IA64 VT-d dma_mapping_error always says that dma_map_single
is successful even though it could fail. Note that X86 VT-d works
properly in this regard.

This patch fixes IA64 VT-d dma_mapping_error by adding VT-d's own
dma_mapping_error() that works for both X86_64 and IA64. VT-d uses
zero as an error dma address so VT-d's dma_mapping_error returns 1 if
a passed dma address is zero (as x86's VT-d dma_mapping_error does
now).

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
wifi-calibration
FUJITA Tomonori 2009-01-28 21:53:17 +09:00 committed by Ingo Molnar
parent 97d9800de9
commit dfb805e831
2 changed files with 6 additions and 6 deletions
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6
arch/ia64/kernel/pci-dma.c
View File

@ -99,11 +99,6 @@ int iommu_dma_supported(struct device *dev, u64 mask)
}
EXPORT_SYMBOL(iommu_dma_supported);
static int vtd_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
return 0;
}
void __init pci_iommu_alloc(void)
{
dma_ops = &intel_dma_ops;
@ -113,7 +108,6 @@ void __init pci_iommu_alloc(void)
dma_ops->sync_single_for_device = machvec_dma_sync_single;
dma_ops->sync_sg_for_device = machvec_dma_sync_sg;
dma_ops->dma_supported = iommu_dma_supported;
dma_ops->mapping_error = vtd_dma_mapping_error;
/*
* The order of these functions is important for

6
drivers/pci/intel-iommu.c
View File

@ -2581,6 +2581,11 @@ int intel_map_sg(struct device *hwdev, struct scatterlist *sglist, int nelems,
return nelems;
}
static int intel_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
return !dma_addr;
}
struct dma_map_ops intel_dma_ops = {
.alloc_coherent = intel_alloc_coherent,
.free_coherent = intel_free_coherent,
@ -2588,6 +2593,7 @@ struct dma_map_ops intel_dma_ops = {
.unmap_sg = intel_unmap_sg,
.map_page = intel_map_page,
.unmap_page = intel_unmap_page,
.mapping_error = intel_mapping_error,
};
static inline int iommu_domain_cache_init(void)