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| author | Chris Metcalf <cmetcalf@tilera.com> | 2013-08-30 10:12:36 -0400 |
|---|---|---|
| committer | Chris Metcalf <cmetcalf@tilera.com> | 2013-09-03 14:53:37 -0400 |
| commit | b40f451d56de69477a2244a0b4082f644699673f (patch) | |
| tree | a1f113a598fd28f61ae9a26e8eb19e528309beff /arch/tile/include/asm/dma-mapping.h | |
| parent | 6d715790ef6b5b903779a14d995ce3d9e680bec0 (diff) | |
| download | linux-b40f451d56de69477a2244a0b4082f644699673f.tar.gz linux-b40f451d56de69477a2244a0b4082f644699673f.tar.bz2 linux-b40f451d56de69477a2244a0b4082f644699673f.zip | |
tile PCI RC: make default consistent DMA mask 32-bit
This change sets the PCI devices' initial DMA capabilities
conservatively and promotes them at the request of the driver,
as opposed to assuming advanced DMA capabilities. The old design
runs the risk of breaking drivers that assume default capabilities.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'arch/tile/include/asm/dma-mapping.h')
| -rw-r--r-- | arch/tile/include/asm/dma-mapping.h | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/arch/tile/include/asm/dma-mapping.h b/arch/tile/include/asm/dma-mapping.h index 6f522d569132..1eae359d8315 100644 --- a/arch/tile/include/asm/dma-mapping.h +++ b/arch/tile/include/asm/dma-mapping.h @@ -92,14 +92,19 @@ dma_set_mask(struct device *dev, u64 mask) { struct dma_map_ops *dma_ops = get_dma_ops(dev); - /* Handle legacy PCI devices with limited memory addressability. */ - if ((dma_ops == gx_pci_dma_map_ops || - dma_ops == gx_hybrid_pci_dma_map_ops || - dma_ops == gx_legacy_pci_dma_map_ops) && - (mask <= DMA_BIT_MASK(32))) { - set_dma_ops(dev, gx_legacy_pci_dma_map_ops); - set_dma_offset(dev, 0); - if (mask > dev->archdata.max_direct_dma_addr) + /* + * For PCI devices with 64-bit DMA addressing capability, promote + * the dma_ops to hybrid, with the consistent memory DMA space limited + * to 32-bit. For 32-bit capable devices, limit the streaming DMA + * address range to max_direct_dma_addr. + */ + if (dma_ops == gx_pci_dma_map_ops || + dma_ops == gx_hybrid_pci_dma_map_ops || + dma_ops == gx_legacy_pci_dma_map_ops) { + if (mask == DMA_BIT_MASK(64) && + dma_ops == gx_legacy_pci_dma_map_ops) + set_dma_ops(dev, gx_hybrid_pci_dma_map_ops); + else if (mask > dev->archdata.max_direct_dma_addr) mask = dev->archdata.max_direct_dma_addr; } |