cd15b04844
This patch adds the support for to create a direct iommu "bypass" window on IODA2 bridges (such as Power8) allowing to bypass iommu page translation completely for 64-bit DMA capable devices, thus significantly improving DMA performances. Additionally, this adds a hook to the struct iommu_table so that the IOMMU API / VFIO can disable the bypass when external ownership is requested, since in that case, the device will be used by an environment such as userspace or a KVM guest which must not be allowed to bypass translations. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
29 lines
573 B
C
29 lines
573 B
C
#ifndef _POWERNV_H
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#define _POWERNV_H
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#ifdef CONFIG_SMP
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extern void pnv_smp_init(void);
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#else
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static inline void pnv_smp_init(void) { }
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#endif
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struct pci_dev;
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#ifdef CONFIG_PCI
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extern void pnv_pci_init(void);
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extern void pnv_pci_shutdown(void);
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extern int pnv_pci_dma_set_mask(struct pci_dev *pdev, u64 dma_mask);
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#else
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static inline void pnv_pci_init(void) { }
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static inline void pnv_pci_shutdown(void) { }
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static inline int pnv_pci_dma_set_mask(struct pci_dev *pdev, u64 dma_mask)
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{
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return -ENODEV;
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}
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#endif
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extern void pnv_lpc_init(void);
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#endif /* _POWERNV_H */
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