From: Thierry Reding Date: Mon, 25 Aug 2014 11:02:52 +0000 (+0200) Subject: s390: Implement dma_{alloc,free}_attrs() X-Git-Tag: firefly_0821_release~176^2~3093^2~1 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=90114d65feea716eeae0ab51e92c95b140b2e6fc;p=firefly-linux-kernel-4.4.55.git s390: Implement dma_{alloc,free}_attrs() The S390 architecture advertises support for HAVE_DMA_ATTRS when PCI is enabled. Patches to unify some of the DMA API would like to rely on the dma_alloc_attrs() and dma_free_attrs() functions to be provided when an architecture supports DMA attributes. Rename dma_alloc_coherent() and dma_free_coherent() to dma_alloc_attrs() and dma_free_attrs() since they are functionally equivalent and alias the former to the latter for compatibility. For consistency with other architectures, also reuse the existing symbol HAVE_DMA_ATTRS defined in arch/Kconfig instead of providing a duplicate. Select it when PCI is enabled. While at it, drop a redundant 'default n' from the PCI Kconfig symbol. Signed-off-by: Thierry Reding Acked-By: Sebastian Ott Signed-off-by: Marek Szyprowski --- diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index ab39ceb89ecf..fafeae01725a 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -498,8 +498,8 @@ config QDIO menuconfig PCI bool "PCI support" - default n depends on 64BIT + select HAVE_DMA_ATTRS select PCI_MSI help Enable PCI support. @@ -546,9 +546,6 @@ config HAS_DMA config NEED_SG_DMA_LENGTH def_bool PCI -config HAVE_DMA_ATTRS - def_bool PCI - config NEED_DMA_MAP_STATE def_bool PCI diff --git a/arch/s390/include/asm/dma-mapping.h b/arch/s390/include/asm/dma-mapping.h index 3fbc67d9e197..709955ddaa4d 100644 --- a/arch/s390/include/asm/dma-mapping.h +++ b/arch/s390/include/asm/dma-mapping.h @@ -56,24 +56,35 @@ static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) return dma_addr == DMA_ERROR_CODE; } -static inline void *dma_alloc_coherent(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t flag) +#define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL) + +static inline void *dma_alloc_attrs(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t flags, + struct dma_attrs *attrs) { struct dma_map_ops *ops = get_dma_ops(dev); - void *ret; + void *cpu_addr; + + BUG_ON(!ops); - ret = ops->alloc(dev, size, dma_handle, flag, NULL); - debug_dma_alloc_coherent(dev, size, *dma_handle, ret); - return ret; + cpu_addr = ops->alloc(dev, size, dma_handle, flags, attrs); + debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr); + + return cpu_addr; } -static inline void dma_free_coherent(struct device *dev, size_t size, - void *cpu_addr, dma_addr_t dma_handle) +#define dma_free_coherent(d, s, c, h) dma_free_attrs(d, s, c, h, NULL) + +static inline void dma_free_attrs(struct device *dev, size_t size, + void *cpu_addr, dma_addr_t dma_handle, + struct dma_attrs *attrs) { - struct dma_map_ops *dma_ops = get_dma_ops(dev); + struct dma_map_ops *ops = get_dma_ops(dev); + + BUG_ON(!ops); debug_dma_free_coherent(dev, size, cpu_addr, dma_handle); - dma_ops->free(dev, size, cpu_addr, dma_handle, NULL); + ops->free(dev, size, cpu_addr, dma_handle, attrs); } #endif /* _ASM_S390_DMA_MAPPING_H */