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);
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;
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;
* 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;
}
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;
s->dma_address = DMA_ERROR_CODE;
s->dma_length = 0;
}
+ if (s == outs)
+ break;
}
spin_unlock_irqrestore(&(tbl->it_lock), flags);
return 0;
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);
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
*/
#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,
}
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;
}
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);
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff