Messages in this thread Patch in this message | | | Date | Wed, 19 Nov 2008 13:07:47 +0900 | Subject | Re: [PATCH] ia64: SN specific version of dma_get_required_mask() | From | FUJITA Tomonori <> |
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On Mon, 17 Nov 2008 10:24:54 -0600 John Keller <jpk@sgi.com> wrote:
> Create a platform specific version of dma_get_required_mask() > for ia64 SN Altix. All SN Altix platforms support 64 bit DMA > addressing regardless of the size of system memory. > Create a ia64 machvec for dma_get_required_mask, with the > SN version unconditionally returning DMA_64BIT_MASK. > > > Signed-off-by: John Keller <jpk@sgi.com> > --- > > Documentation/DMA-API.txt | 9 ++++----- > arch/ia64/include/asm/dma-mapping.h | 3 +++ > arch/ia64/include/asm/machvec.h | 7 +++++++ > arch/ia64/include/asm/machvec_init.h | 1 + > arch/ia64/include/asm/machvec_sn2.h | 2 ++ > arch/ia64/pci/pci.c | 21 +++++++++++++++++++++ > arch/ia64/sn/pci/pci_dma.c | 6 ++++++ > include/linux/dma-mapping.h | 2 ++ > 8 files changed, 46 insertions(+), 5 deletions(-)
(snip)
> static int __init pcibios_init(void) > { > set_pci_cacheline_size(); > Index: linux-2.6/include/linux/dma-mapping.h > =================================================================== > --- linux-2.6.orig/include/linux/dma-mapping.h 2008-11-17 08:38:07.740451313 -0600 > +++ linux-2.6/include/linux/dma-mapping.h 2008-11-17 08:39:50.573284674 -0600 > @@ -70,7 +70,9 @@ static inline u64 dma_get_mask(struct de > return DMA_32BIT_MASK; > } > > +#ifndef CONFIG_IA64 > extern u64 dma_get_required_mask(struct device *dev); > +#endif
I think that adding CONFIG_IA64 to include/linux/dma-mapping.h is wrong. I also think that you don't need to ifndef this extern.
If you need this trick with only CONFIG_IA64_SGI_SN2, how about something like this? It's simple and we can avoid duplicate the generic dma_get_required_mask in arch/ia64/pci/pci.c
diff --git a/arch/ia64/include/asm/dma-mapping.h b/arch/ia64/include/asm/dma-mapping.h index bbab7e2..4ffbd18 100644 --- a/arch/ia64/include/asm/dma-mapping.h +++ b/arch/ia64/include/asm/dma-mapping.h @@ -144,6 +144,13 @@ static inline struct dma_mapping_ops *get_dma_ops(struct device *dev) return dma_ops; } - +#ifdef CONFIG_IA64_SGI_SN2 +#define ARCH_HAS_DMA_GET_REQUIRED_MASK +static inline u64 dma_get_required_mask(struct device *dev) +{ + return DMA_64BIT_MASK; +} +EXPORT_SYMBOL_GPL(dma_get_required_mask); +#endif #endif /* _ASM_IA64_DMA_MAPPING_H */
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