5f34fe1cfc
* 'core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (63 commits) stacktrace: provide save_stack_trace_tsk() weak alias rcu: provide RCU options on non-preempt architectures too printk: fix discarding message when recursion_bug futex: clean up futex_(un)lock_pi fault handling "Tree RCU": scalable classic RCU implementation futex: rename field in futex_q to clarify single waiter semantics x86/swiotlb: add default swiotlb_arch_range_needs_mapping x86/swiotlb: add default phys<->bus conversion x86: unify pci iommu setup and allow swiotlb to compile for 32 bit x86: add swiotlb allocation functions swiotlb: consolidate swiotlb info message printing swiotlb: support bouncing of HighMem pages swiotlb: factor out copy to/from device swiotlb: add arch hook to force mapping swiotlb: allow architectures to override phys<->bus<->phys conversions swiotlb: add comment where we handle the overflow of a dma mask on 32 bit rcu: fix rcutorture behavior during reboot resources: skip sanity check of busy resources swiotlb: move some definitions to header swiotlb: allow architectures to override swiotlb pool allocation ... Fix up trivial conflicts in arch/x86/kernel/Makefile arch/x86/mm/init_32.c include/linux/hardirq.h as per Ingo's suggestions.
307 lines
8.4 KiB
C
307 lines
8.4 KiB
C
#ifndef _ASM_X86_DMA_MAPPING_H
|
|
#define _ASM_X86_DMA_MAPPING_H
|
|
|
|
/*
|
|
* IOMMU interface. See Documentation/DMA-mapping.txt and DMA-API.txt for
|
|
* documentation.
|
|
*/
|
|
|
|
#include <linux/scatterlist.h>
|
|
#include <asm/io.h>
|
|
#include <asm/swiotlb.h>
|
|
#include <asm-generic/dma-coherent.h>
|
|
|
|
extern dma_addr_t bad_dma_address;
|
|
extern int iommu_merge;
|
|
extern struct device x86_dma_fallback_dev;
|
|
extern int panic_on_overflow;
|
|
|
|
struct dma_mapping_ops {
|
|
int (*mapping_error)(struct device *dev,
|
|
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, phys_addr_t 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 struct dma_mapping_ops *dma_ops;
|
|
|
|
static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
|
|
{
|
|
#ifdef CONFIG_X86_32
|
|
return dma_ops;
|
|
#else
|
|
if (unlikely(!dev) || !dev->archdata.dma_ops)
|
|
return dma_ops;
|
|
else
|
|
return dev->archdata.dma_ops;
|
|
#endif
|
|
}
|
|
|
|
/* Make sure we keep the same behaviour */
|
|
static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
|
|
{
|
|
struct dma_mapping_ops *ops = get_dma_ops(dev);
|
|
if (ops->mapping_error)
|
|
return ops->mapping_error(dev, dma_addr);
|
|
|
|
return (dma_addr == bad_dma_address);
|
|
}
|
|
|
|
#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
|
|
#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
|
|
#define dma_is_consistent(d, h) (1)
|
|
|
|
extern int dma_supported(struct device *hwdev, u64 mask);
|
|
extern int dma_set_mask(struct device *dev, u64 mask);
|
|
|
|
extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
|
|
dma_addr_t *dma_addr, gfp_t flag);
|
|
|
|
static inline dma_addr_t
|
|
dma_map_single(struct device *hwdev, void *ptr, size_t size,
|
|
int direction)
|
|
{
|
|
struct dma_mapping_ops *ops = get_dma_ops(hwdev);
|
|
|
|
BUG_ON(!valid_dma_direction(direction));
|
|
return ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
|
|
}
|
|
|
|
static inline void
|
|
dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
|
|
int direction)
|
|
{
|
|
struct dma_mapping_ops *ops = get_dma_ops(dev);
|
|
|
|
BUG_ON(!valid_dma_direction(direction));
|
|
if (ops->unmap_single)
|
|
ops->unmap_single(dev, addr, size, direction);
|
|
}
|
|
|
|
static inline int
|
|
dma_map_sg(struct device *hwdev, struct scatterlist *sg,
|
|
int nents, int direction)
|
|
{
|
|
struct dma_mapping_ops *ops = get_dma_ops(hwdev);
|
|
|
|
BUG_ON(!valid_dma_direction(direction));
|
|
return ops->map_sg(hwdev, sg, nents, direction);
|
|
}
|
|
|
|
static inline void
|
|
dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
|
|
int direction)
|
|
{
|
|
struct dma_mapping_ops *ops = get_dma_ops(hwdev);
|
|
|
|
BUG_ON(!valid_dma_direction(direction));
|
|
if (ops->unmap_sg)
|
|
ops->unmap_sg(hwdev, sg, nents, direction);
|
|
}
|
|
|
|
static inline void
|
|
dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
|
|
size_t size, int direction)
|
|
{
|
|
struct dma_mapping_ops *ops = get_dma_ops(hwdev);
|
|
|
|
BUG_ON(!valid_dma_direction(direction));
|
|
if (ops->sync_single_for_cpu)
|
|
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)
|
|
{
|
|
struct dma_mapping_ops *ops = get_dma_ops(hwdev);
|
|
|
|
BUG_ON(!valid_dma_direction(direction));
|
|
if (ops->sync_single_for_device)
|
|
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)
|
|
{
|
|
struct dma_mapping_ops *ops = get_dma_ops(hwdev);
|
|
|
|
BUG_ON(!valid_dma_direction(direction));
|
|
if (ops->sync_single_range_for_cpu)
|
|
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)
|
|
{
|
|
struct dma_mapping_ops *ops = get_dma_ops(hwdev);
|
|
|
|
BUG_ON(!valid_dma_direction(direction));
|
|
if (ops->sync_single_range_for_device)
|
|
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)
|
|
{
|
|
struct dma_mapping_ops *ops = get_dma_ops(hwdev);
|
|
|
|
BUG_ON(!valid_dma_direction(direction));
|
|
if (ops->sync_sg_for_cpu)
|
|
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)
|
|
{
|
|
struct dma_mapping_ops *ops = get_dma_ops(hwdev);
|
|
|
|
BUG_ON(!valid_dma_direction(direction));
|
|
if (ops->sync_sg_for_device)
|
|
ops->sync_sg_for_device(hwdev, sg, nelems, direction);
|
|
|
|
flush_write_buffers();
|
|
}
|
|
|
|
static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
|
|
size_t offset, size_t size,
|
|
int direction)
|
|
{
|
|
struct dma_mapping_ops *ops = get_dma_ops(dev);
|
|
|
|
BUG_ON(!valid_dma_direction(direction));
|
|
return ops->map_single(dev, page_to_phys(page) + offset,
|
|
size, direction);
|
|
}
|
|
|
|
static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
|
|
size_t size, int direction)
|
|
{
|
|
dma_unmap_single(dev, addr, size, direction);
|
|
}
|
|
|
|
static inline void
|
|
dma_cache_sync(struct device *dev, void *vaddr, size_t size,
|
|
enum dma_data_direction dir)
|
|
{
|
|
flush_write_buffers();
|
|
}
|
|
|
|
static inline int dma_get_cache_alignment(void)
|
|
{
|
|
/* no easy way to get cache size on all x86, so return the
|
|
* maximum possible, to be safe */
|
|
return boot_cpu_data.x86_clflush_size;
|
|
}
|
|
|
|
static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
|
|
gfp_t gfp)
|
|
{
|
|
unsigned long dma_mask = 0;
|
|
|
|
dma_mask = dev->coherent_dma_mask;
|
|
if (!dma_mask)
|
|
dma_mask = (gfp & GFP_DMA) ? DMA_24BIT_MASK : DMA_32BIT_MASK;
|
|
|
|
return dma_mask;
|
|
}
|
|
|
|
static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
|
|
{
|
|
unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp);
|
|
|
|
if (dma_mask <= DMA_24BIT_MASK)
|
|
gfp |= GFP_DMA;
|
|
#ifdef CONFIG_X86_64
|
|
if (dma_mask <= DMA_32BIT_MASK && !(gfp & GFP_DMA))
|
|
gfp |= GFP_DMA32;
|
|
#endif
|
|
return gfp;
|
|
}
|
|
|
|
static inline void *
|
|
dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
|
|
gfp_t gfp)
|
|
{
|
|
struct dma_mapping_ops *ops = get_dma_ops(dev);
|
|
void *memory;
|
|
|
|
gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
|
|
|
|
if (dma_alloc_from_coherent(dev, size, dma_handle, &memory))
|
|
return memory;
|
|
|
|
if (!dev) {
|
|
dev = &x86_dma_fallback_dev;
|
|
gfp |= GFP_DMA;
|
|
}
|
|
|
|
if (!is_device_dma_capable(dev))
|
|
return NULL;
|
|
|
|
if (!ops->alloc_coherent)
|
|
return NULL;
|
|
|
|
return ops->alloc_coherent(dev, size, dma_handle,
|
|
dma_alloc_coherent_gfp_flags(dev, gfp));
|
|
}
|
|
|
|
static inline void dma_free_coherent(struct device *dev, size_t size,
|
|
void *vaddr, dma_addr_t bus)
|
|
{
|
|
struct dma_mapping_ops *ops = get_dma_ops(dev);
|
|
|
|
WARN_ON(irqs_disabled()); /* for portability */
|
|
|
|
if (dma_release_from_coherent(dev, get_order(size), vaddr))
|
|
return;
|
|
|
|
if (ops->free_coherent)
|
|
ops->free_coherent(dev, size, vaddr, bus);
|
|
}
|
|
|
|
#endif
|