linux/kernel/dma/virt.c
Christoph Hellwig 0a0f0d8be7 dma-mapping: split <linux/dma-mapping.h>
Split out all the bits that are purely for dma_map_ops implementations
and related code into a new <linux/dma-map-ops.h> header so that they
don't get pulled into all the drivers.  That also means the architecture
specific <asm/dma-mapping.h> is not pulled in by <linux/dma-mapping.h>
any more, which leads to a missing includes that were pulled in by the
x86 or arm versions in a few not overly portable drivers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
2020-10-06 07:07:03 +02:00

62 lines
1.5 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* DMA operations that map to virtual addresses without flushing memory.
*/
#include <linux/export.h>
#include <linux/mm.h>
#include <linux/dma-map-ops.h>
#include <linux/scatterlist.h>
static void *dma_virt_alloc(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp,
unsigned long attrs)
{
void *ret;
ret = (void *)__get_free_pages(gfp | __GFP_ZERO, get_order(size));
if (ret)
*dma_handle = (uintptr_t)ret;
return ret;
}
static void dma_virt_free(struct device *dev, size_t size,
void *cpu_addr, dma_addr_t dma_addr,
unsigned long attrs)
{
free_pages((unsigned long)cpu_addr, get_order(size));
}
static dma_addr_t dma_virt_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction dir,
unsigned long attrs)
{
return (uintptr_t)(page_address(page) + offset);
}
static int dma_virt_map_sg(struct device *dev, struct scatterlist *sgl,
int nents, enum dma_data_direction dir,
unsigned long attrs)
{
int i;
struct scatterlist *sg;
for_each_sg(sgl, sg, nents, i) {
BUG_ON(!sg_page(sg));
sg_dma_address(sg) = (uintptr_t)sg_virt(sg);
sg_dma_len(sg) = sg->length;
}
return nents;
}
const struct dma_map_ops dma_virt_ops = {
.alloc = dma_virt_alloc,
.free = dma_virt_free,
.map_page = dma_virt_map_page,
.map_sg = dma_virt_map_sg,
.alloc_pages = dma_common_alloc_pages,
.free_pages = dma_common_free_pages,
};
EXPORT_SYMBOL(dma_virt_ops);