mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-19 18:24:14 +08:00
663b55b9b3
None of these files are actually using any __init type directives and hence don't need to include <linux/init.h>. Most are just a left over from __devinit and __cpuinit removal, or simply due to code getting copied from one driver to the next. [ hpa: undid incorrect removal from arch/x86/kernel/head_32.S ] Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Link: http://lkml.kernel.org/r/1389054026-12947-1-git-send-email-paul.gortmaker@windriver.com Signed-off-by: H. Peter Anvin <hpa@zytor.com>
100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
/* Fallback functions when the main IOMMU code is not compiled in. This
|
|
code is roughly equivalent to i386. */
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/string.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/mm.h>
|
|
|
|
#include <asm/processor.h>
|
|
#include <asm/iommu.h>
|
|
#include <asm/dma.h>
|
|
|
|
static int
|
|
check_addr(char *name, struct device *hwdev, dma_addr_t bus, size_t size)
|
|
{
|
|
if (hwdev && !dma_capable(hwdev, bus, size)) {
|
|
if (*hwdev->dma_mask >= DMA_BIT_MASK(32))
|
|
printk(KERN_ERR
|
|
"nommu_%s: overflow %Lx+%zu of device mask %Lx\n",
|
|
name, (long long)bus, size,
|
|
(long long)*hwdev->dma_mask);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static dma_addr_t nommu_map_page(struct device *dev, struct page *page,
|
|
unsigned long offset, size_t size,
|
|
enum dma_data_direction dir,
|
|
struct dma_attrs *attrs)
|
|
{
|
|
dma_addr_t bus = page_to_phys(page) + offset;
|
|
WARN_ON(size == 0);
|
|
if (!check_addr("map_single", dev, bus, size))
|
|
return DMA_ERROR_CODE;
|
|
flush_write_buffers();
|
|
return bus;
|
|
}
|
|
|
|
/* Map a set of buffers described by scatterlist in streaming
|
|
* mode for DMA. This is the scatter-gather version of the
|
|
* above pci_map_single interface. Here the scatter gather list
|
|
* elements are each tagged with the appropriate dma address
|
|
* and length. They are obtained via sg_dma_{address,length}(SG).
|
|
*
|
|
* NOTE: An implementation may be able to use a smaller number of
|
|
* DMA address/length pairs than there are SG table elements.
|
|
* (for example via virtual mapping capabilities)
|
|
* The routine returns the number of addr/length pairs actually
|
|
* used, at most nents.
|
|
*
|
|
* Device ownership issues as mentioned above for pci_map_single are
|
|
* the same here.
|
|
*/
|
|
static int nommu_map_sg(struct device *hwdev, struct scatterlist *sg,
|
|
int nents, enum dma_data_direction dir,
|
|
struct dma_attrs *attrs)
|
|
{
|
|
struct scatterlist *s;
|
|
int i;
|
|
|
|
WARN_ON(nents == 0 || sg[0].length == 0);
|
|
|
|
for_each_sg(sg, s, nents, i) {
|
|
BUG_ON(!sg_page(s));
|
|
s->dma_address = sg_phys(s);
|
|
if (!check_addr("map_sg", hwdev, s->dma_address, s->length))
|
|
return 0;
|
|
s->dma_length = s->length;
|
|
}
|
|
flush_write_buffers();
|
|
return nents;
|
|
}
|
|
|
|
static void nommu_sync_single_for_device(struct device *dev,
|
|
dma_addr_t addr, size_t size,
|
|
enum dma_data_direction dir)
|
|
{
|
|
flush_write_buffers();
|
|
}
|
|
|
|
|
|
static void nommu_sync_sg_for_device(struct device *dev,
|
|
struct scatterlist *sg, int nelems,
|
|
enum dma_data_direction dir)
|
|
{
|
|
flush_write_buffers();
|
|
}
|
|
|
|
struct dma_map_ops nommu_dma_ops = {
|
|
.alloc = dma_generic_alloc_coherent,
|
|
.free = dma_generic_free_coherent,
|
|
.map_sg = nommu_map_sg,
|
|
.map_page = nommu_map_page,
|
|
.sync_single_for_device = nommu_sync_single_for_device,
|
|
.sync_sg_for_device = nommu_sync_sg_for_device,
|
|
.is_phys = 1,
|
|
};
|