diff options
| -rw-r--r-- | arch/powerpc/kernel/dma_64.c | 5 | ||||
| -rw-r--r-- | arch/powerpc/kernel/ibmebus.c | 11 | ||||
| -rw-r--r-- | arch/powerpc/kernel/iommu.c | 23 | ||||
| -rw-r--r-- | include/asm-powerpc/dma-mapping.h | 158 | ||||
| -rw-r--r-- | include/asm-powerpc/scatterlist.h | 2 |
5 files changed, 34 insertions, 165 deletions
diff --git a/arch/powerpc/kernel/dma_64.c b/arch/powerpc/kernel/dma_64.c index 7b0e754..9001104 100644 --- a/arch/powerpc/kernel/dma_64.c +++ b/arch/powerpc/kernel/dma_64.c @@ -154,12 +154,13 @@ static void dma_direct_unmap_single(struct device *dev, dma_addr_t dma_addr, { } -static int dma_direct_map_sg(struct device *dev, struct scatterlist *sg, +static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction direction) { + struct scatterlist *sg; int i; - for (i = 0; i < nents; i++, sg++) { + for_each_sg(sgl, sg, nents, i) { sg->dma_address = (page_to_phys(sg->page) + sg->offset) | dma_direct_offset; sg->dma_length = sg->length; diff --git a/arch/powerpc/kernel/ibmebus.c b/arch/powerpc/kernel/ibmebus.c index 53bf646..2e16ca5 100644 --- a/arch/powerpc/kernel/ibmebus.c +++ b/arch/powerpc/kernel/ibmebus.c @@ -87,15 +87,16 @@ static void ibmebus_unmap_single(struct device *dev, } static int ibmebus_map_sg(struct device *dev, - struct scatterlist *sg, + struct scatterlist *sgl, int nents, enum dma_data_direction direction) { + struct scatterlist *sg; int i; - for (i = 0; i < nents; i++) { - sg[i].dma_address = (dma_addr_t)page_address(sg[i].page) - + sg[i].offset; - sg[i].dma_length = sg[i].length; + for_each_sg(sgl, sg, nents, i) { + sg->dma_address = (dma_addr_t)page_address(sg->page) + + sg->offset; + sg->dma_length = sg->length; } return nents; diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c index e4ec6eee..306a6f7 100644 --- a/arch/powerpc/kernel/iommu.c +++ b/arch/powerpc/kernel/iommu.c @@ -277,7 +277,7 @@ int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist, dma_addr_t dma_next = 0, dma_addr; unsigned long flags; struct scatterlist *s, *outs, *segstart; - int outcount, incount; + int outcount, incount, i; unsigned long handle; BUG_ON(direction == DMA_NONE); @@ -297,7 +297,7 @@ int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist, spin_lock_irqsave(&(tbl->it_lock), flags); - for (s = outs; nelems; nelems--, s++) { + for_each_sg(sglist, s, nelems, i) { unsigned long vaddr, npages, entry, slen; slen = s->length; @@ -341,7 +341,8 @@ int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist, if (novmerge || (dma_addr != dma_next)) { /* Can't merge: create a new segment */ segstart = s; - outcount++; outs++; + outcount++; + outs = sg_next(outs); DBG(" can't merge, new segment.\n"); } else { outs->dma_length += s->length; @@ -374,7 +375,7 @@ int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist, * next entry of the sglist if we didn't fill the list completely */ if (outcount < incount) { - outs++; + outs = sg_next(outs); outs->dma_address = DMA_ERROR_CODE; outs->dma_length = 0; } @@ -385,7 +386,7 @@ int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist, return outcount; failure: - for (s = &sglist[0]; s <= outs; s++) { + for_each_sg(sglist, s, nelems, i) { if (s->dma_length != 0) { unsigned long vaddr, npages; @@ -395,6 +396,8 @@ int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist, s->dma_address = DMA_ERROR_CODE; s->dma_length = 0; } + if (s == outs) + break; } spin_unlock_irqrestore(&(tbl->it_lock), flags); return 0; @@ -404,6 +407,7 @@ int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist, void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist, int nelems, enum dma_data_direction direction) { + struct scatterlist *sg; unsigned long flags; BUG_ON(direction == DMA_NONE); @@ -413,15 +417,16 @@ void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist, spin_lock_irqsave(&(tbl->it_lock), flags); + sg = sglist; while (nelems--) { unsigned int npages; - dma_addr_t dma_handle = sglist->dma_address; + dma_addr_t dma_handle = sg->dma_address; - if (sglist->dma_length == 0) + if (sg->dma_length == 0) break; - npages = iommu_num_pages(dma_handle,sglist->dma_length); + npages = iommu_num_pages(dma_handle, sg->dma_length); __iommu_free(tbl, dma_handle, npages); - sglist++; + sg = sg_next(sg); } /* Flush/invalidate TLBs if necessary. As for iommu_free(), we diff --git a/include/asm-powerpc/dma-mapping.h b/include/asm-powerpc/dma-mapping.h index 60eacde..2af321f 100644 --- a/include/asm-powerpc/dma-mapping.h +++ b/include/asm-powerpc/dma-mapping.h @@ -6,149 +6,6 @@ */ #ifndef _ASM_DMA_MAPPING_H #define _ASM_DMA_MAPPING_H -#ifdef __KERNEL__ - -#include <linux/types.h> -#include <linux/cache.h> -/* need struct page definitions */ -#include <linux/mm.h> -#include <linux/scatterlist.h> -#include <asm/io.h> - -#define DMA_ERROR_CODE (~(dma_addr_t)0x0) - -#ifdef CONFIG_NOT_COHERENT_CACHE -/* - * DMA-consistent mapping functions for PowerPCs that don't support - * cache snooping. These allocate/free a region of uncached mapped - * memory space for use with DMA devices. Alternatively, you could - * allocate the space "normally" and use the cache management functions - * to ensure it is consistent. - */ -extern void *__dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp); -extern void __dma_free_coherent(size_t size, void *vaddr); -extern void __dma_sync(void *vaddr, size_t size, int direction); -extern void __dma_sync_page(struct page *page, unsigned long offset, - size_t size, int direction); - -#else /* ! CONFIG_NOT_COHERENT_CACHE */ -/* - * Cache coherent cores. - */ - -#define __dma_alloc_coherent(gfp, size, handle) NULL -#define __dma_free_coherent(size, addr) ((void)0) -#define __dma_sync(addr, size, rw) ((void)0) -#define __dma_sync_page(pg, off, sz, rw) ((void)0) - -#endif /* ! CONFIG_NOT_COHERENT_CACHE */ - -#ifdef CONFIG_PPC64 -/* - * DMA operations are abstracted for G5 vs. i/pSeries, PCI vs. VIO - */ -struct dma_mapping_ops { - void * (*alloc_coherent)(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t flag); - void (*free_coherent)(struct device *dev, size_t size, - void *vaddr, dma_addr_t dma_handle); - dma_addr_t (*map_single)(struct device *dev, void *ptr, - size_t size, enum dma_data_direction direction); - void (*unmap_single)(struct device *dev, dma_addr_t dma_addr, - size_t size, enum dma_data_direction direction); - int (*map_sg)(struct device *dev, struct scatterlist *sg, - int nents, enum dma_data_direction direction); - void (*unmap_sg)(struct device *dev, struct scatterlist *sg, - int nents, enum dma_data_direction direction); - int (*dma_supported)(struct device *dev, u64 mask); - int (*set_dma_mask)(struct device *dev, u64 dma_mask); -}; - -static inline struct dma_mapping_ops *get_dma_ops(struct device *dev) -{ - /* We don't handle the NULL dev case for ISA for now. We could - * do it via an out of line call but it is not needed for now. The - * only ISA DMA device we support is the floppy and we have a hack - * in the floppy driver directly to get a device for us. - */ - if (unlikely(dev == NULL || dev->archdata.dma_ops == NULL)) - return NULL; - return dev->archdata.dma_ops; -} - -static inline int dma_supported(struct device *dev, u64 mask) -{ - struct dma_mapping_ops *dma_ops = get_dma_ops(dev); - - if (unlikely(dma_ops == NULL)) - return 0; - if (dma_ops->dma_supported == NULL) - return 1; - return dma_ops->dma_supported(dev, mask); -} - -static inline int dma_set_mask(struct device *dev, u64 dma_mask) -{ - struct dma_mapping_ops *dma_ops = get_dma_ops(dev); - - if (unlikely(dma_ops == NULL)) - return -EIO; - if (dma_ops->set_dma_mask != NULL) - return dma_ops->set_dma_mask(dev, dma_mask); - if (!dev->dma_mask || !dma_supported(dev, dma_mask)) - return -EIO; - *dev->dma_mask = dma_mask; - return 0; -} - -static inline void *dma_alloc_coherent(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t flag) -{ - struct dma_mapping_ops *dma_ops = get_dma_ops(dev); - - BUG_ON(!dma_ops); - return dma_ops->alloc_coherent(dev, size, dma_handle, flag); -} - -static inline void dma_free_coherent(struct device *dev, size_t size, - void *cpu_addr, dma_addr_t dma_handle) -{ - struct dma_mapping_ops *dma_ops = get_dma_ops(dev); - - BUG_ON(!dma_ops); - dma_ops->free_coherent(dev, size, cpu_addr, dma_handle); -} - -static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr, - size_t size, - enum dma_data_direction direction) -{ - struct dma_mapping_ops *dma_ops = get_dma_ops(dev); - - BUG_ON(!dma_ops); - return dma_ops->map_single(dev, cpu_addr, size, direction); -} - -static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, - size_t size, - enum dma_data_direction direction) -{ - struct dma_mapping_ops *dma_ops = get_dma_ops(dev); - - BUG_ON(!dma_ops); - dma_ops->unmap_single(dev, dma_addr, size, direction); -} - -static inline dma_addr_t dma_map_page(struct device *dev, struct page *page, - unsigned long offset, size_t size, - enum dma_data_direction direction) -{ - struct dma_mapping_ops *dma_ops = get_dma_ops(dev); - - BUG_ON(!dma_ops); - return dma_ops->map_single(dev, page_address(page) + offset, size, - direction); -} static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, @@ -276,14 +133,15 @@ static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address, } static inline int -dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, +dma_map_sg(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction direction) { + struct scatterlist *sg; int i; BUG_ON(direction == DMA_NONE); - for (i = 0; i < nents; i++, sg++) { + for_each_sg(sgl, sg, nents, i) { BUG_ON(!sg->page); __dma_sync_page(sg->page, sg->offset, sg->length, direction); sg->dma_address = page_to_bus(sg->page) + sg->offset; @@ -318,26 +176,28 @@ static inline void dma_sync_single_for_device(struct device *dev, } static inline void dma_sync_sg_for_cpu(struct device *dev, - struct scatterlist *sg, int nents, + struct scatterlist *sgl, int nents, enum dma_data_direction direction) { + struct scatterlist *sg; int i; BUG_ON(direction == DMA_NONE); - for (i = 0; i < nents; i++, sg++) + for_each_sg(sgl, sg, nents, i) __dma_sync_page(sg->page, sg->offset, sg->length, direction); } static inline void dma_sync_sg_for_device(struct device *dev, - struct scatterlist *sg, int nents, + struct scatterlist *sgl, int nents, enum dma_data_direction direction) { + struct scatterlist *sg; int i; BUG_ON(direction == DMA_NONE); - for (i = 0; i < nents; i++, sg++) + for_each_sg(sgl, sg, nents, i) __dma_sync_page(sg->page, sg->offset, sg->length, direction); } diff --git a/include/asm-powerpc/scatterlist.h b/include/asm-powerpc/scatterlist.h index 8c992d1..b075f61 100644 --- a/include/asm-powerpc/scatterlist.h +++ b/include/asm-powerpc/scatterlist.h @@ -41,5 +41,7 @@ struct scatterlist { #define ISA_DMA_THRESHOLD (~0UL) #endif +#define ARCH_HAS_SG_CHAIN + #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_SCATTERLIST_H */ |
