![Yinghai Lu](/assets/img/avatar_default.png)
via following scripts FILES=$(find * -type f | grep -vE 'oprofile|[^K]config') sed -i \ -e 's/lmb/memblock/g' \ -e 's/LMB/MEMBLOCK/g' \ $FILES for N in $(find . -name lmb.[ch]); do M=$(echo $N | sed 's/lmb/memblock/g') mv $N $M done and remove some wrong change like lmbench and dlmb etc. also move memblock.c from lib/ to mm/ Suggested-by: Ingo Molnar <mingo@elte.hu> Acked-by: "H. Peter Anvin" <hpa@zytor.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
164 lines
4.1 KiB
C
164 lines
4.1 KiB
C
/*
|
|
* Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation
|
|
*
|
|
* Provide default implementations of the DMA mapping callbacks for
|
|
* directly mapped busses.
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/dma-debug.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/memblock.h>
|
|
#include <asm/bug.h>
|
|
#include <asm/abs_addr.h>
|
|
|
|
/*
|
|
* Generic direct DMA implementation
|
|
*
|
|
* This implementation supports a per-device offset that can be applied if
|
|
* the address at which memory is visible to devices is not 0. Platform code
|
|
* can set archdata.dma_data to an unsigned long holding the offset. By
|
|
* default the offset is PCI_DRAM_OFFSET.
|
|
*/
|
|
|
|
|
|
void *dma_direct_alloc_coherent(struct device *dev, size_t size,
|
|
dma_addr_t *dma_handle, gfp_t flag)
|
|
{
|
|
void *ret;
|
|
#ifdef CONFIG_NOT_COHERENT_CACHE
|
|
ret = __dma_alloc_coherent(dev, size, dma_handle, flag);
|
|
if (ret == NULL)
|
|
return NULL;
|
|
*dma_handle += get_dma_offset(dev);
|
|
return ret;
|
|
#else
|
|
struct page *page;
|
|
int node = dev_to_node(dev);
|
|
|
|
/* ignore region specifiers */
|
|
flag &= ~(__GFP_HIGHMEM);
|
|
|
|
page = alloc_pages_node(node, flag, get_order(size));
|
|
if (page == NULL)
|
|
return NULL;
|
|
ret = page_address(page);
|
|
memset(ret, 0, size);
|
|
*dma_handle = virt_to_abs(ret) + get_dma_offset(dev);
|
|
|
|
return ret;
|
|
#endif
|
|
}
|
|
|
|
void dma_direct_free_coherent(struct device *dev, size_t size,
|
|
void *vaddr, dma_addr_t dma_handle)
|
|
{
|
|
#ifdef CONFIG_NOT_COHERENT_CACHE
|
|
__dma_free_coherent(size, vaddr);
|
|
#else
|
|
free_pages((unsigned long)vaddr, get_order(size));
|
|
#endif
|
|
}
|
|
|
|
static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
|
|
int nents, enum dma_data_direction direction,
|
|
struct dma_attrs *attrs)
|
|
{
|
|
struct scatterlist *sg;
|
|
int i;
|
|
|
|
for_each_sg(sgl, sg, nents, i) {
|
|
sg->dma_address = sg_phys(sg) + get_dma_offset(dev);
|
|
sg->dma_length = sg->length;
|
|
__dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
|
|
}
|
|
|
|
return nents;
|
|
}
|
|
|
|
static void dma_direct_unmap_sg(struct device *dev, struct scatterlist *sg,
|
|
int nents, enum dma_data_direction direction,
|
|
struct dma_attrs *attrs)
|
|
{
|
|
}
|
|
|
|
static int dma_direct_dma_supported(struct device *dev, u64 mask)
|
|
{
|
|
#ifdef CONFIG_PPC64
|
|
/* Could be improved so platforms can set the limit in case
|
|
* they have limited DMA windows
|
|
*/
|
|
return mask >= (memblock_end_of_DRAM() - 1);
|
|
#else
|
|
return 1;
|
|
#endif
|
|
}
|
|
|
|
static inline dma_addr_t dma_direct_map_page(struct device *dev,
|
|
struct page *page,
|
|
unsigned long offset,
|
|
size_t size,
|
|
enum dma_data_direction dir,
|
|
struct dma_attrs *attrs)
|
|
{
|
|
BUG_ON(dir == DMA_NONE);
|
|
__dma_sync_page(page, offset, size, dir);
|
|
return page_to_phys(page) + offset + get_dma_offset(dev);
|
|
}
|
|
|
|
static inline void dma_direct_unmap_page(struct device *dev,
|
|
dma_addr_t dma_address,
|
|
size_t size,
|
|
enum dma_data_direction direction,
|
|
struct dma_attrs *attrs)
|
|
{
|
|
}
|
|
|
|
#ifdef CONFIG_NOT_COHERENT_CACHE
|
|
static inline void dma_direct_sync_sg(struct device *dev,
|
|
struct scatterlist *sgl, int nents,
|
|
enum dma_data_direction direction)
|
|
{
|
|
struct scatterlist *sg;
|
|
int i;
|
|
|
|
for_each_sg(sgl, sg, nents, i)
|
|
__dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
|
|
}
|
|
|
|
static inline void dma_direct_sync_single(struct device *dev,
|
|
dma_addr_t dma_handle, size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
__dma_sync(bus_to_virt(dma_handle), size, direction);
|
|
}
|
|
#endif
|
|
|
|
struct dma_map_ops dma_direct_ops = {
|
|
.alloc_coherent = dma_direct_alloc_coherent,
|
|
.free_coherent = dma_direct_free_coherent,
|
|
.map_sg = dma_direct_map_sg,
|
|
.unmap_sg = dma_direct_unmap_sg,
|
|
.dma_supported = dma_direct_dma_supported,
|
|
.map_page = dma_direct_map_page,
|
|
.unmap_page = dma_direct_unmap_page,
|
|
#ifdef CONFIG_NOT_COHERENT_CACHE
|
|
.sync_single_for_cpu = dma_direct_sync_single,
|
|
.sync_single_for_device = dma_direct_sync_single,
|
|
.sync_sg_for_cpu = dma_direct_sync_sg,
|
|
.sync_sg_for_device = dma_direct_sync_sg,
|
|
#endif
|
|
};
|
|
EXPORT_SYMBOL(dma_direct_ops);
|
|
|
|
#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
|
|
|
|
static int __init dma_init(void)
|
|
{
|
|
dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
|
|
|
|
return 0;
|
|
}
|
|
fs_initcall(dma_init);
|