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| author | Benjamin Herrenschmidt | 2014-02-11 01:32:38 +0100 |
|---|---|---|
| committer | Benjamin Herrenschmidt | 2014-02-11 06:07:37 +0100 |
| commit | cd15b048445d0a54f7147c35a86c5a16ef231554 (patch) | |
| tree | 80c7e63624143adc5d453106ec13f445438c6135 /arch/powerpc/platforms/powernv/powernv.h | |
| parent | powerpc: Fix endian issues in kexec and crash dump code (diff) | |
| download | kernel-qcow2-linux-cd15b048445d0a54f7147c35a86c5a16ef231554.tar.gz kernel-qcow2-linux-cd15b048445d0a54f7147c35a86c5a16ef231554.tar.xz kernel-qcow2-linux-cd15b048445d0a54f7147c35a86c5a16ef231554.zip | |
powerpc/powernv: Add iommu DMA bypass support for IODA2
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>
Diffstat (limited to 'arch/powerpc/platforms/powernv/powernv.h')
| -rw-r--r-- | arch/powerpc/platforms/powernv/powernv.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/powernv.h b/arch/powerpc/platforms/powernv/powernv.h index de6819be1f95..0051e108ef0f 100644 --- a/arch/powerpc/platforms/powernv/powernv.h +++ b/arch/powerpc/platforms/powernv/powernv.h @@ -7,12 +7,20 @@ extern void pnv_smp_init(void); static inline void pnv_smp_init(void) { } #endif +struct pci_dev; + #ifdef CONFIG_PCI extern void pnv_pci_init(void); extern void pnv_pci_shutdown(void); +extern int pnv_pci_dma_set_mask(struct pci_dev *pdev, u64 dma_mask); #else static inline void pnv_pci_init(void) { } static inline void pnv_pci_shutdown(void) { } + +static inline int pnv_pci_dma_set_mask(struct pci_dev *pdev, u64 dma_mask) +{ + return -ENODEV; +} #endif extern void pnv_lpc_init(void); |