[mirror_ubuntu-disco-kernel.git] / include / linux / swiotlb.h

#ifndef __LINUX_SWIOTLB_H
#define __LINUX_SWIOTLB_H

#include <linux/dma-direction.h>
#include <linux/init.h>
#include <linux/types.h>

struct device;
struct dma_attrs;
struct page;
struct scatterlist;

extern int swiotlb_force;

/*
 * Maximum allowable number of contiguous slabs to map,
 * must be a power of 2.  What is the appropriate value ?
 * The complexity of {map,unmap}_single is linearly dependent on this value.
 */
#define IO_TLB_SEGSIZE	128

/*
 * log of the size of each IO TLB slab.  The number of slabs is command line
 * controllable.
 */
#define IO_TLB_SHIFT 11

extern void swiotlb_init(int verbose);
int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
extern unsigned long swiotlb_nr_tbl(void);
unsigned long swiotlb_size_or_default(void);
extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);

/*
 * Enumeration for sync targets
 */
enum dma_sync_target {
	SYNC_FOR_CPU = 0,
	SYNC_FOR_DEVICE = 1,
};

/* define the last possible byte of physical address space as a mapping error */
#define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)

extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
					  dma_addr_t tbl_dma_addr,
					  phys_addr_t phys, size_t size,
					  enum dma_data_direction dir);

extern void swiotlb_tbl_unmap_single(struct device *hwdev,
				     phys_addr_t tlb_addr,
				     size_t size, enum dma_data_direction dir);

extern void swiotlb_tbl_sync_single(struct device *hwdev,
				    phys_addr_t tlb_addr,
				    size_t size, enum dma_data_direction dir,
				    enum dma_sync_target target);

/* Accessory functions. */
extern void
*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
			dma_addr_t *dma_handle, gfp_t flags);

extern void
swiotlb_free_coherent(struct device *hwdev, size_t size,
		      void *vaddr, dma_addr_t dma_handle);

extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
				   unsigned long offset, size_t size,
				   enum dma_data_direction dir,
				   struct dma_attrs *attrs);
extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
			       size_t size, enum dma_data_direction dir,
			       struct dma_attrs *attrs);

extern int
swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
	       enum dma_data_direction dir);

extern void
swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
		 enum dma_data_direction dir);

extern int
swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
		     enum dma_data_direction dir, struct dma_attrs *attrs);

extern void
swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
		       int nelems, enum dma_data_direction dir,
		       struct dma_attrs *attrs);

extern void
swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
			    size_t size, enum dma_data_direction dir);

extern void
swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
			int nelems, enum dma_data_direction dir);

extern void
swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
			       size_t size, enum dma_data_direction dir);

extern void
swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
			   int nelems, enum dma_data_direction dir);

extern int
swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);

extern int
swiotlb_dma_supported(struct device *hwdev, u64 mask);

#ifdef CONFIG_SWIOTLB
extern void __init swiotlb_free(void);
#else
static inline void swiotlb_free(void) { }
#endif

extern void swiotlb_print_info(void);
extern int is_swiotlb_buffer(phys_addr_t paddr);

#endif /* __LINUX_SWIOTLB_H */
Commit	Line	Data
1648993f JR	1	#ifndef __LINUX_SWIOTLB_H
	2	#define __LINUX_SWIOTLB_H
	3
38674442 TR	4	#include <linux/dma-direction.h>
38674442 TR	5	#include <linux/init.h>
1648993f JR	6	#include <linux/types.h>
	7
	8	struct device;
	9	struct dma_attrs;
38674442	10	struct page;
1648993f JR	11	struct scatterlist;
1648993f JR	12
6959450e FT	13	extern int swiotlb_force;
6959450e FT	14
0016fdee IC	15	/*
	16	* Maximum allowable number of contiguous slabs to map,
	17	* must be a power of 2. What is the appropriate value ?
	18	* The complexity of {map,unmap}_single is linearly dependent on this value.
	19	*/
	20	#define IO_TLB_SEGSIZE 128
	21
0016fdee IC	22	/*
	23	* log of the size of each IO TLB slab. The number of slabs is command line
	24	* controllable.
	25	*/
	26	#define IO_TLB_SHIFT 11
	27
ad32e8cb	28	extern void swiotlb_init(int verbose);
ac2cbab2	29	int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
f21ffe9f	30	extern unsigned long swiotlb_nr_tbl(void);
c729de8f	31	unsigned long swiotlb_size_or_default(void);
74838b75	32	extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
1648993f	33
d7ef1533 KRW	34	/*
	35	* Enumeration for sync targets
	36	*/
	37	enum dma_sync_target {
	38	SYNC_FOR_CPU = 0,
	39	SYNC_FOR_DEVICE = 1,
	40	};
e05ed4d1 AD	41
	42	/* define the last possible byte of physical address space as a mapping error */
	43	#define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
	44
	45	extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
	46	dma_addr_t tbl_dma_addr,
	47	phys_addr_t phys, size_t size,
	48	enum dma_data_direction dir);
d7ef1533	49
61ca08c3 AD	50	extern void swiotlb_tbl_unmap_single(struct device *hwdev,
61ca08c3 AD	51	phys_addr_t tlb_addr,
d7ef1533 KRW	52	size_t size, enum dma_data_direction dir);
d7ef1533 KRW	53
fbfda893 AD	54	extern void swiotlb_tbl_sync_single(struct device *hwdev,
fbfda893 AD	55	phys_addr_t tlb_addr,
d7ef1533 KRW	56	size_t size, enum dma_data_direction dir,
	57	enum dma_sync_target target);
	58
	59	/* Accessory functions. */
1648993f JR	60	extern void
	61	swiotlb_alloc_coherent(struct device hwdev, size_t size,
	62	dma_addr_t *dma_handle, gfp_t flags);
	63
	64	extern void
	65	swiotlb_free_coherent(struct device *hwdev, size_t size,
	66	void *vaddr, dma_addr_t dma_handle);
	67
f98eee8e FT	68	extern dma_addr_t swiotlb_map_page(struct device dev, struct page page,
	69	unsigned long offset, size_t size,
	70	enum dma_data_direction dir,
	71	struct dma_attrs *attrs);
	72	extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
	73	size_t size, enum dma_data_direction dir,
	74	struct dma_attrs *attrs);
1648993f JR	75
	76	extern int
	77	swiotlb_map_sg(struct device hwdev, struct scatterlist sg, int nents,
22d48269	78	enum dma_data_direction dir);
1648993f JR	79
	80	extern void
	81	swiotlb_unmap_sg(struct device hwdev, struct scatterlist sg, int nents,
22d48269	82	enum dma_data_direction dir);
1648993f JR	83
	84	extern int
	85	swiotlb_map_sg_attrs(struct device hwdev, struct scatterlist sgl, int nelems,
160c1d8e	86	enum dma_data_direction dir, struct dma_attrs *attrs);
1648993f JR	87
	88	extern void
	89	swiotlb_unmap_sg_attrs(struct device hwdev, struct scatterlist sgl,
160c1d8e FT	90	int nelems, enum dma_data_direction dir,
160c1d8e FT	91	struct dma_attrs *attrs);
1648993f JR	92
	93	extern void
	94	swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
160c1d8e	95	size_t size, enum dma_data_direction dir);
1648993f JR	96
	97	extern void
	98	swiotlb_sync_sg_for_cpu(struct device hwdev, struct scatterlist sg,
160c1d8e	99	int nelems, enum dma_data_direction dir);
1648993f JR	100
	101	extern void
	102	swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
160c1d8e	103	size_t size, enum dma_data_direction dir);
1648993f JR	104
	105	extern void
	106	swiotlb_sync_sg_for_device(struct device hwdev, struct scatterlist sg,
160c1d8e	107	int nelems, enum dma_data_direction dir);
1648993f	108
1648993f JR	109	extern int
	110	swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
	111
	112	extern int
	113	swiotlb_dma_supported(struct device *hwdev, u64 mask);
	114
5740afdb FT	115	#ifdef CONFIG_SWIOTLB
	116	extern void __init swiotlb_free(void);
	117	#else
	118	static inline void swiotlb_free(void) { }
	119	#endif
	120
ad32e8cb	121	extern void swiotlb_print_info(void);
9c5a3621 AM	122	extern int is_swiotlb_buffer(phys_addr_t paddr);
9c5a3621 AM	123
1648993f	124	#endif /* __LINUX_SWIOTLB_H */