mirror of
https://github.com/torvalds/linux.git
synced 2024-11-16 00:52:01 +00:00
18dabf473e
Change the page member of the scatterlist structure to be an unsigned long, and encode more stuff in the lower bits: - Bits 0 and 1 zero: this is a normal sg entry. Next sg entry is located at sg + 1. - Bit 0 set: this is a chain entry, the next real entry is at ->page_link with the two low bits masked off. - Bit 1 set: this is the final entry in the sg entry. sg_next() will return NULL when passed such an entry. It's thus important that sg table users use the proper accessors to get and set the page member. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
188 lines
4.3 KiB
C
188 lines
4.3 KiB
C
#ifndef _ASM_I386_DMA_MAPPING_H
|
|
#define _ASM_I386_DMA_MAPPING_H
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/scatterlist.h>
|
|
|
|
#include <asm/cache.h>
|
|
#include <asm/io.h>
|
|
#include <asm/bug.h>
|
|
|
|
#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
|
|
#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
|
|
|
|
void *dma_alloc_coherent(struct device *dev, size_t size,
|
|
dma_addr_t *dma_handle, gfp_t flag);
|
|
|
|
void dma_free_coherent(struct device *dev, size_t size,
|
|
void *vaddr, dma_addr_t dma_handle);
|
|
|
|
static inline dma_addr_t
|
|
dma_map_single(struct device *dev, void *ptr, size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
BUG_ON(!valid_dma_direction(direction));
|
|
WARN_ON(size == 0);
|
|
flush_write_buffers();
|
|
return virt_to_phys(ptr);
|
|
}
|
|
|
|
static inline void
|
|
dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
BUG_ON(!valid_dma_direction(direction));
|
|
}
|
|
|
|
static inline int
|
|
dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
|
|
enum dma_data_direction direction)
|
|
{
|
|
struct scatterlist *sg;
|
|
int i;
|
|
|
|
BUG_ON(!valid_dma_direction(direction));
|
|
WARN_ON(nents == 0 || sglist[0].length == 0);
|
|
|
|
for_each_sg(sglist, sg, nents, i) {
|
|
BUG_ON(!sg_page(sg));
|
|
|
|
sg->dma_address = sg_phys(sg);
|
|
}
|
|
|
|
flush_write_buffers();
|
|
return nents;
|
|
}
|
|
|
|
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)
|
|
{
|
|
BUG_ON(!valid_dma_direction(direction));
|
|
return page_to_phys(page) + offset;
|
|
}
|
|
|
|
static inline void
|
|
dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
BUG_ON(!valid_dma_direction(direction));
|
|
}
|
|
|
|
|
|
static inline void
|
|
dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
|
|
enum dma_data_direction direction)
|
|
{
|
|
BUG_ON(!valid_dma_direction(direction));
|
|
}
|
|
|
|
static inline void
|
|
dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
}
|
|
|
|
static inline void
|
|
dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
flush_write_buffers();
|
|
}
|
|
|
|
static inline void
|
|
dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
|
|
unsigned long offset, size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
}
|
|
|
|
static inline void
|
|
dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
|
|
unsigned long offset, size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
flush_write_buffers();
|
|
}
|
|
|
|
static inline void
|
|
dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
|
|
enum dma_data_direction direction)
|
|
{
|
|
}
|
|
|
|
static inline void
|
|
dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
|
|
enum dma_data_direction direction)
|
|
{
|
|
flush_write_buffers();
|
|
}
|
|
|
|
static inline int
|
|
dma_mapping_error(dma_addr_t dma_addr)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
extern int forbid_dac;
|
|
|
|
static inline int
|
|
dma_supported(struct device *dev, u64 mask)
|
|
{
|
|
/*
|
|
* we fall back to GFP_DMA when the mask isn't all 1s,
|
|
* so we can't guarantee allocations that must be
|
|
* within a tighter range than GFP_DMA..
|
|
*/
|
|
if(mask < 0x00ffffff)
|
|
return 0;
|
|
|
|
/* Work around chipset bugs */
|
|
if (forbid_dac > 0 && mask > 0xffffffffULL)
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static inline int
|
|
dma_set_mask(struct device *dev, u64 mask)
|
|
{
|
|
if(!dev->dma_mask || !dma_supported(dev, mask))
|
|
return -EIO;
|
|
|
|
*dev->dma_mask = mask;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
dma_get_cache_alignment(void)
|
|
{
|
|
/* no easy way to get cache size on all x86, so return the
|
|
* maximum possible, to be safe */
|
|
return (1 << INTERNODE_CACHE_SHIFT);
|
|
}
|
|
|
|
#define dma_is_consistent(d, h) (1)
|
|
|
|
static inline void
|
|
dma_cache_sync(struct device *dev, void *vaddr, size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
flush_write_buffers();
|
|
}
|
|
|
|
#define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
|
|
extern int
|
|
dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
|
|
dma_addr_t device_addr, size_t size, int flags);
|
|
|
|
extern void
|
|
dma_release_declared_memory(struct device *dev);
|
|
|
|
extern void *
|
|
dma_mark_declared_memory_occupied(struct device *dev,
|
|
dma_addr_t device_addr, size_t size);
|
|
|
|
#endif
|