mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-26 03:17:48 +00:00
17a941d854
AK: I hacked Muli's original patch a lot and there were a lot
of changes - all bugs are probably to blame on me now.
There were also some changes in the fall back behaviour
for swiotlb - in particular it doesn't try to use GFP_DMA
now anymore. Also all DMA mapping operations use the
same core dma_alloc_coherent code with proper fallbacks now.
And various other changes and cleanups.
Known problems: iommu=force swiotlb=force together breaks
needs more testing.
This patch cleans up x86_64's DMA mapping dispatching code. Right now
we have three possible IOMMU types: AGP GART, swiotlb and nommu, and
in the future we will also have Xen's x86_64 swiotlb and other HW
IOMMUs for x86_64. In order to support all of them cleanly, this
patch:
- introduces a struct dma_mapping_ops with function pointers for each
of the DMA mapping operations of gart (AMD HW IOMMU), swiotlb
(software IOMMU) and nommu (no IOMMU).
- gets rid of:
if (swiotlb)
return swiotlb_xxx();
- PCI_DMA_BUS_IS_PHYS is now checked against the dma_ops being set
This makes swiotlb faster by avoiding double copying in some cases.
Signed-Off-By: Muli Ben-Yehuda <mulix@mulix.org>
Signed-Off-By: Jon D. Mason <jdmason@us.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
188 lines
5.6 KiB
C
188 lines
5.6 KiB
C
#ifndef _X8664_DMA_MAPPING_H
|
|
#define _X8664_DMA_MAPPING_H 1
|
|
|
|
/*
|
|
* IOMMU interface. See Documentation/DMA-mapping.txt and DMA-API.txt for
|
|
* documentation.
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
|
|
#include <asm/scatterlist.h>
|
|
#include <asm/io.h>
|
|
#include <asm/swiotlb.h>
|
|
|
|
struct dma_mapping_ops {
|
|
int (*mapping_error)(dma_addr_t dma_addr);
|
|
void* (*alloc_coherent)(struct device *dev, size_t size,
|
|
dma_addr_t *dma_handle, gfp_t gfp);
|
|
void (*free_coherent)(struct device *dev, size_t size,
|
|
void *vaddr, dma_addr_t dma_handle);
|
|
dma_addr_t (*map_single)(struct device *hwdev, void *ptr,
|
|
size_t size, int direction);
|
|
/* like map_single, but doesn't check the device mask */
|
|
dma_addr_t (*map_simple)(struct device *hwdev, char *ptr,
|
|
size_t size, int direction);
|
|
void (*unmap_single)(struct device *dev, dma_addr_t addr,
|
|
size_t size, int direction);
|
|
void (*sync_single_for_cpu)(struct device *hwdev,
|
|
dma_addr_t dma_handle, size_t size,
|
|
int direction);
|
|
void (*sync_single_for_device)(struct device *hwdev,
|
|
dma_addr_t dma_handle, size_t size,
|
|
int direction);
|
|
void (*sync_single_range_for_cpu)(struct device *hwdev,
|
|
dma_addr_t dma_handle, unsigned long offset,
|
|
size_t size, int direction);
|
|
void (*sync_single_range_for_device)(struct device *hwdev,
|
|
dma_addr_t dma_handle, unsigned long offset,
|
|
size_t size, int direction);
|
|
void (*sync_sg_for_cpu)(struct device *hwdev,
|
|
struct scatterlist *sg, int nelems,
|
|
int direction);
|
|
void (*sync_sg_for_device)(struct device *hwdev,
|
|
struct scatterlist *sg, int nelems,
|
|
int direction);
|
|
int (*map_sg)(struct device *hwdev, struct scatterlist *sg,
|
|
int nents, int direction);
|
|
void (*unmap_sg)(struct device *hwdev,
|
|
struct scatterlist *sg, int nents,
|
|
int direction);
|
|
int (*dma_supported)(struct device *hwdev, u64 mask);
|
|
int is_phys;
|
|
};
|
|
|
|
extern dma_addr_t bad_dma_address;
|
|
extern struct dma_mapping_ops* dma_ops;
|
|
extern int iommu_merge;
|
|
|
|
static inline int dma_mapping_error(dma_addr_t dma_addr)
|
|
{
|
|
if (dma_ops->mapping_error)
|
|
return dma_ops->mapping_error(dma_addr);
|
|
|
|
return (dma_addr == bad_dma_address);
|
|
}
|
|
|
|
extern void *dma_alloc_coherent(struct device *dev, size_t size,
|
|
dma_addr_t *dma_handle, gfp_t gfp);
|
|
extern 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 *hwdev, void *ptr, size_t size,
|
|
int direction)
|
|
{
|
|
return dma_ops->map_single(hwdev, ptr, size, direction);
|
|
}
|
|
|
|
static inline void
|
|
dma_unmap_single(struct device *dev, dma_addr_t addr,size_t size,
|
|
int direction)
|
|
{
|
|
dma_ops->unmap_single(dev, addr, size, direction);
|
|
}
|
|
|
|
#define dma_map_page(dev,page,offset,size,dir) \
|
|
dma_map_single((dev), page_address(page)+(offset), (size), (dir))
|
|
|
|
#define dma_unmap_page dma_unmap_single
|
|
|
|
static inline void
|
|
dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
|
|
size_t size, int direction)
|
|
{
|
|
if (dma_ops->sync_single_for_cpu)
|
|
dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
|
|
direction);
|
|
flush_write_buffers();
|
|
}
|
|
|
|
static inline void
|
|
dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
|
|
size_t size, int direction)
|
|
{
|
|
if (dma_ops->sync_single_for_device)
|
|
dma_ops->sync_single_for_device(hwdev, dma_handle, size,
|
|
direction);
|
|
flush_write_buffers();
|
|
}
|
|
|
|
static inline void
|
|
dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
|
|
unsigned long offset, size_t size, int direction)
|
|
{
|
|
if (dma_ops->sync_single_range_for_cpu) {
|
|
dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset, size, direction);
|
|
}
|
|
|
|
flush_write_buffers();
|
|
}
|
|
|
|
static inline void
|
|
dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
|
|
unsigned long offset, size_t size, int direction)
|
|
{
|
|
if (dma_ops->sync_single_range_for_device)
|
|
dma_ops->sync_single_range_for_device(hwdev, dma_handle,
|
|
offset, size, direction);
|
|
|
|
flush_write_buffers();
|
|
}
|
|
|
|
static inline void
|
|
dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
|
|
int nelems, int direction)
|
|
{
|
|
if (dma_ops->sync_sg_for_cpu)
|
|
dma_ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
|
|
flush_write_buffers();
|
|
}
|
|
|
|
static inline void
|
|
dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
|
|
int nelems, int direction)
|
|
{
|
|
if (dma_ops->sync_sg_for_device) {
|
|
dma_ops->sync_sg_for_device(hwdev, sg, nelems, direction);
|
|
}
|
|
|
|
flush_write_buffers();
|
|
}
|
|
|
|
static inline int
|
|
dma_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, int direction)
|
|
{
|
|
return dma_ops->map_sg(hwdev, sg, nents, direction);
|
|
}
|
|
|
|
static inline void
|
|
dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
|
|
int direction)
|
|
{
|
|
dma_ops->unmap_sg(hwdev, sg, nents, direction);
|
|
}
|
|
|
|
extern int dma_supported(struct device *hwdev, u64 mask);
|
|
|
|
/* same for gart, swiotlb, and nommu */
|
|
static inline int dma_get_cache_alignment(void)
|
|
{
|
|
return boot_cpu_data.x86_clflush_size;
|
|
}
|
|
|
|
#define dma_is_consistent(h) 1
|
|
|
|
extern int dma_set_mask(struct device *dev, u64 mask);
|
|
|
|
static inline void
|
|
dma_cache_sync(void *vaddr, size_t size, enum dma_data_direction dir)
|
|
{
|
|
flush_write_buffers();
|
|
}
|
|
|
|
extern struct device fallback_dev;
|
|
extern int panic_on_overflow;
|
|
|
|
#endif /* _X8664_DMA_MAPPING_H */
|