mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 05:34:00 +08:00
782e6769c0
Add a new dma_map_ops implementation that uses dma-direct for the address mapping of streaming mappings, and which requires arch-specific implemenations of coherent allocate/free. Architectures have to provide flushing helpers to ownership trasnfers to the device and/or CPU, and can provide optional implementations of the coherent mmap functionality, and the cache_flush routines for non-coherent long term allocations. Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Alexey Brodkin <abrodkin@synopsys.com> Acked-by: Vineet Gupta <vgupta@synopsys.com>
103 lines
3.2 KiB
C
103 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2018 Christoph Hellwig.
|
|
*
|
|
* DMA operations that map physical memory directly without providing cache
|
|
* coherence.
|
|
*/
|
|
#include <linux/export.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/dma-direct.h>
|
|
#include <linux/dma-noncoherent.h>
|
|
#include <linux/scatterlist.h>
|
|
|
|
static void dma_noncoherent_sync_single_for_device(struct device *dev,
|
|
dma_addr_t addr, size_t size, enum dma_data_direction dir)
|
|
{
|
|
arch_sync_dma_for_device(dev, dma_to_phys(dev, addr), size, dir);
|
|
}
|
|
|
|
static void dma_noncoherent_sync_sg_for_device(struct device *dev,
|
|
struct scatterlist *sgl, int nents, enum dma_data_direction dir)
|
|
{
|
|
struct scatterlist *sg;
|
|
int i;
|
|
|
|
for_each_sg(sgl, sg, nents, i)
|
|
arch_sync_dma_for_device(dev, sg_phys(sg), sg->length, dir);
|
|
}
|
|
|
|
static dma_addr_t dma_noncoherent_map_page(struct device *dev, struct page *page,
|
|
unsigned long offset, size_t size, enum dma_data_direction dir,
|
|
unsigned long attrs)
|
|
{
|
|
dma_addr_t addr;
|
|
|
|
addr = dma_direct_map_page(dev, page, offset, size, dir, attrs);
|
|
if (!dma_mapping_error(dev, addr) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
|
|
arch_sync_dma_for_device(dev, page_to_phys(page) + offset,
|
|
size, dir);
|
|
return addr;
|
|
}
|
|
|
|
static int dma_noncoherent_map_sg(struct device *dev, struct scatterlist *sgl,
|
|
int nents, enum dma_data_direction dir, unsigned long attrs)
|
|
{
|
|
nents = dma_direct_map_sg(dev, sgl, nents, dir, attrs);
|
|
if (nents > 0 && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
|
|
dma_noncoherent_sync_sg_for_device(dev, sgl, nents, dir);
|
|
return nents;
|
|
}
|
|
|
|
#ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU
|
|
static void dma_noncoherent_sync_single_for_cpu(struct device *dev,
|
|
dma_addr_t addr, size_t size, enum dma_data_direction dir)
|
|
{
|
|
arch_sync_dma_for_cpu(dev, dma_to_phys(dev, addr), size, dir);
|
|
}
|
|
|
|
static void dma_noncoherent_sync_sg_for_cpu(struct device *dev,
|
|
struct scatterlist *sgl, int nents, enum dma_data_direction dir)
|
|
{
|
|
struct scatterlist *sg;
|
|
int i;
|
|
|
|
for_each_sg(sgl, sg, nents, i)
|
|
arch_sync_dma_for_cpu(dev, sg_phys(sg), sg->length, dir);
|
|
}
|
|
|
|
static void dma_noncoherent_unmap_page(struct device *dev, dma_addr_t addr,
|
|
size_t size, enum dma_data_direction dir, unsigned long attrs)
|
|
{
|
|
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
|
|
dma_noncoherent_sync_single_for_cpu(dev, addr, size, dir);
|
|
}
|
|
|
|
static void dma_noncoherent_unmap_sg(struct device *dev, struct scatterlist *sgl,
|
|
int nents, enum dma_data_direction dir, unsigned long attrs)
|
|
{
|
|
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
|
|
dma_noncoherent_sync_sg_for_cpu(dev, sgl, nents, dir);
|
|
}
|
|
#endif
|
|
|
|
const struct dma_map_ops dma_noncoherent_ops = {
|
|
.alloc = arch_dma_alloc,
|
|
.free = arch_dma_free,
|
|
.mmap = arch_dma_mmap,
|
|
.sync_single_for_device = dma_noncoherent_sync_single_for_device,
|
|
.sync_sg_for_device = dma_noncoherent_sync_sg_for_device,
|
|
.map_page = dma_noncoherent_map_page,
|
|
.map_sg = dma_noncoherent_map_sg,
|
|
#ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU
|
|
.sync_single_for_cpu = dma_noncoherent_sync_single_for_cpu,
|
|
.sync_sg_for_cpu = dma_noncoherent_sync_sg_for_cpu,
|
|
.unmap_page = dma_noncoherent_unmap_page,
|
|
.unmap_sg = dma_noncoherent_unmap_sg,
|
|
#endif
|
|
.dma_supported = dma_direct_supported,
|
|
.mapping_error = dma_direct_mapping_error,
|
|
.cache_sync = arch_dma_cache_sync,
|
|
};
|
|
EXPORT_SYMBOL(dma_noncoherent_ops);
|