[deliverable/linux.git] / include / asm-x86 / dma-mapping.h

#ifndef _ASM_DMA_MAPPING_H_
#define _ASM_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;
extern int force_iommu;

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)
{
#ifdef CONFIG_X86_32
	return 0;
#else
	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);
#endif
}

#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);

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 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;

	if (dma_alloc_from_coherent(dev, size, dma_handle, &memory))
		return memory;

	if (!dev) {
		dev = &x86_dma_fallback_dev;
		gfp |= GFP_DMA;
	}

	if (ops->alloc_coherent)
		return ops->alloc_coherent(dev, size,
				dma_handle, gfp);
	return NULL;
}

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
Commit	Line	Data
6f536635 GC	1	#ifndef _ASM_DMA_MAPPING_H_
	2	#define _ASM_DMA_MAPPING_H_
	3
	4	/*
	5	* IOMMU interface. See Documentation/DMA-mapping.txt and DMA-API.txt for
	6	* documentation.
	7	*/
	8
	9	#include <linux/scatterlist.h>
	10	#include <asm/io.h>
	11	#include <asm/swiotlb.h>
6c505ce3	12	#include <asm-generic/dma-coherent.h>
6f536635	13
7c183416	14	extern dma_addr_t bad_dma_address;
b7107a3d	15	extern int iommu_merge;
6c505ce3	16	extern struct device x86_dma_fallback_dev;
b7107a3d	17	extern int panic_on_overflow;
fae9a0d8	18	extern int force_iommu;
7c183416	19
6f536635	20	struct dma_mapping_ops {
8d8bb39b FT	21	int (mapping_error)(struct device dev,
8d8bb39b FT	22	dma_addr_t dma_addr);
6f536635 GC	23	void* (alloc_coherent)(struct device dev, size_t size,
	24	dma_addr_t *dma_handle, gfp_t gfp);
	25	void (free_coherent)(struct device dev, size_t size,
	26	void *vaddr, dma_addr_t dma_handle);
2be62149	27	dma_addr_t (map_single)(struct device hwdev, phys_addr_t ptr,
6f536635	28	size_t size, int direction);
6f536635 GC	29	void (unmap_single)(struct device dev, dma_addr_t addr,
	30	size_t size, int direction);
	31	void (sync_single_for_cpu)(struct device hwdev,
	32	dma_addr_t dma_handle, size_t size,
	33	int direction);
	34	void (sync_single_for_device)(struct device hwdev,
	35	dma_addr_t dma_handle, size_t size,
	36	int direction);
	37	void (sync_single_range_for_cpu)(struct device hwdev,
	38	dma_addr_t dma_handle, unsigned long offset,
	39	size_t size, int direction);
	40	void (sync_single_range_for_device)(struct device hwdev,
	41	dma_addr_t dma_handle, unsigned long offset,
	42	size_t size, int direction);
	43	void (sync_sg_for_cpu)(struct device hwdev,
	44	struct scatterlist *sg, int nelems,
	45	int direction);
	46	void (sync_sg_for_device)(struct device hwdev,
	47	struct scatterlist *sg, int nelems,
	48	int direction);
	49	int (map_sg)(struct device hwdev, struct scatterlist *sg,
	50	int nents, int direction);
	51	void (unmap_sg)(struct device hwdev,
	52	struct scatterlist *sg, int nents,
	53	int direction);
	54	int (dma_supported)(struct device hwdev, u64 mask);
	55	int is_phys;
	56	};
	57
8d8bb39b	58	extern struct dma_mapping_ops *dma_ops;
22456b97	59
8d8bb39b	60	static inline struct dma_mapping_ops get_dma_ops(struct device dev)
c786df08	61	{
8d8bb39b FT	62	#ifdef CONFIG_X86_32
	63	return dma_ops;
	64	#else
	65	if (unlikely(!dev) \|\| !dev->archdata.dma_ops)
	66	return dma_ops;
	67	else
	68	return dev->archdata.dma_ops;
	69	#endif
	70	}
	71
	72	/* Make sure we keep the same behaviour */
	73	static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
	74	{
	75	#ifdef CONFIG_X86_32
	76	return 0;
	77	#else
	78	struct dma_mapping_ops *ops = get_dma_ops(dev);
	79	if (ops->mapping_error)
	80	return ops->mapping_error(dev, dma_addr);
c786df08 GC	81
c786df08 GC	82	return (dma_addr == bad_dma_address);
8d8bb39b	83	#endif
c786df08 GC	84	}
c786df08 GC	85
8d396ded GC	86	#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
8d396ded GC	87	#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
6c505ce3	88	#define dma_is_consistent(d, h) (1)
8d396ded	89
802c1f66 GC	90	extern int dma_supported(struct device *hwdev, u64 mask);
	91	extern int dma_set_mask(struct device *dev, u64 mask);
	92
22456b97 GC	93	static inline dma_addr_t
	94	dma_map_single(struct device hwdev, void ptr, size_t size,
	95	int direction)
	96	{
8d8bb39b FT	97	struct dma_mapping_ops *ops = get_dma_ops(hwdev);
8d8bb39b FT	98
22456b97	99	BUG_ON(!valid_dma_direction(direction));
8d8bb39b	100	return ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
22456b97 GC	101	}
22456b97 GC	102
0cb0ae68 GC	103	static inline void
	104	dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
	105	int direction)
	106	{
8d8bb39b FT	107	struct dma_mapping_ops *ops = get_dma_ops(dev);
8d8bb39b FT	108
0cb0ae68	109	BUG_ON(!valid_dma_direction(direction));
8d8bb39b FT	110	if (ops->unmap_single)
8d8bb39b FT	111	ops->unmap_single(dev, addr, size, direction);
0cb0ae68 GC	112	}
0cb0ae68 GC	113
16a3ce9b GC	114	static inline int
	115	dma_map_sg(struct device hwdev, struct scatterlist sg,
	116	int nents, int direction)
	117	{
8d8bb39b FT	118	struct dma_mapping_ops *ops = get_dma_ops(hwdev);
8d8bb39b FT	119
16a3ce9b	120	BUG_ON(!valid_dma_direction(direction));
8d8bb39b	121	return ops->map_sg(hwdev, sg, nents, direction);
16a3ce9b	122	}
72c784f8 GC	123
	124	static inline void
	125	dma_unmap_sg(struct device hwdev, struct scatterlist sg, int nents,
	126	int direction)
	127	{
8d8bb39b FT	128	struct dma_mapping_ops *ops = get_dma_ops(hwdev);
8d8bb39b FT	129
72c784f8	130	BUG_ON(!valid_dma_direction(direction));
8d8bb39b FT	131	if (ops->unmap_sg)
8d8bb39b FT	132	ops->unmap_sg(hwdev, sg, nents, direction);
72c784f8	133	}
c01dd8cf GC	134
	135	static inline void
	136	dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
	137	size_t size, int direction)
	138	{
8d8bb39b FT	139	struct dma_mapping_ops *ops = get_dma_ops(hwdev);
8d8bb39b FT	140
c01dd8cf	141	BUG_ON(!valid_dma_direction(direction));
8d8bb39b FT	142	if (ops->sync_single_for_cpu)
8d8bb39b FT	143	ops->sync_single_for_cpu(hwdev, dma_handle, size, direction);
c01dd8cf GC	144	flush_write_buffers();
	145	}
	146
9231b269 GC	147	static inline void
	148	dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
	149	size_t size, int direction)
	150	{
8d8bb39b FT	151	struct dma_mapping_ops *ops = get_dma_ops(hwdev);
8d8bb39b FT	152
9231b269	153	BUG_ON(!valid_dma_direction(direction));
8d8bb39b FT	154	if (ops->sync_single_for_device)
8d8bb39b FT	155	ops->sync_single_for_device(hwdev, dma_handle, size, direction);
9231b269 GC	156	flush_write_buffers();
	157	}
	158
627610fc GC	159	static inline void
	160	dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
	161	unsigned long offset, size_t size, int direction)
	162	{
8d8bb39b	163	struct dma_mapping_ops *ops = get_dma_ops(hwdev);
627610fc	164
8d8bb39b FT	165	BUG_ON(!valid_dma_direction(direction));
	166	if (ops->sync_single_range_for_cpu)
	167	ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
	168	size, direction);
627610fc GC	169	flush_write_buffers();
627610fc GC	170	}
71362332 GC	171
	172	static inline void
	173	dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
	174	unsigned long offset, size_t size,
	175	int direction)
	176	{
8d8bb39b	177	struct dma_mapping_ops *ops = get_dma_ops(hwdev);
71362332	178
8d8bb39b FT	179	BUG_ON(!valid_dma_direction(direction));
	180	if (ops->sync_single_range_for_device)
	181	ops->sync_single_range_for_device(hwdev, dma_handle,
	182	offset, size, direction);
71362332 GC	183	flush_write_buffers();
	184	}
	185
ed435dee GC	186	static inline void
	187	dma_sync_sg_for_cpu(struct device hwdev, struct scatterlist sg,
	188	int nelems, int direction)
	189	{
8d8bb39b FT	190	struct dma_mapping_ops *ops = get_dma_ops(hwdev);
8d8bb39b FT	191
ed435dee	192	BUG_ON(!valid_dma_direction(direction));
8d8bb39b FT	193	if (ops->sync_sg_for_cpu)
8d8bb39b FT	194	ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
ed435dee GC	195	flush_write_buffers();
ed435dee GC	196	}
e7f3a913 GC	197
	198	static inline void
	199	dma_sync_sg_for_device(struct device hwdev, struct scatterlist sg,
	200	int nelems, int direction)
	201	{
8d8bb39b FT	202	struct dma_mapping_ops *ops = get_dma_ops(hwdev);
8d8bb39b FT	203
e7f3a913	204	BUG_ON(!valid_dma_direction(direction));
8d8bb39b FT	205	if (ops->sync_sg_for_device)
8d8bb39b FT	206	ops->sync_sg_for_device(hwdev, sg, nelems, direction);
e7f3a913 GC	207
	208	flush_write_buffers();
	209	}
4d92fbf2 GC	210
	211	static inline dma_addr_t dma_map_page(struct device dev, struct page page,
	212	size_t offset, size_t size,
	213	int direction)
	214	{
8d8bb39b FT	215	struct dma_mapping_ops *ops = get_dma_ops(dev);
8d8bb39b FT	216
2be62149	217	BUG_ON(!valid_dma_direction(direction));
8d8bb39b FT	218	return ops->map_single(dev, page_to_phys(page) + offset,
8d8bb39b FT	219	size, direction);
4d92fbf2 GC	220	}
	221
	222	static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
	223	size_t size, int direction)
	224	{
	225	dma_unmap_single(dev, addr, size, direction);
	226	}
	227
3cb6a917 GC	228	static inline void
	229	dma_cache_sync(struct device dev, void vaddr, size_t size,
	230	enum dma_data_direction dir)
	231	{
	232	flush_write_buffers();
	233	}
ae17a63b	234
b7107a3d GC	235	static inline int dma_get_cache_alignment(void)
	236	{
	237	/* no easy way to get cache size on all x86, so return the
	238	* maximum possible, to be safe */
	239	return boot_cpu_data.x86_clflush_size;
	240	}
	241
6c505ce3 JR	242	static inline void *
	243	dma_alloc_coherent(struct device dev, size_t size, dma_addr_t dma_handle,
	244	gfp_t gfp)
	245	{
	246	struct dma_mapping_ops *ops = get_dma_ops(dev);
	247	void *memory;
	248
	249	if (dma_alloc_from_coherent(dev, size, dma_handle, &memory))
	250	return memory;
	251
	252	if (!dev) {
	253	dev = &x86_dma_fallback_dev;
	254	gfp \|= GFP_DMA;
	255	}
	256
	257	if (ops->alloc_coherent)
	258	return ops->alloc_coherent(dev, size,
	259	dma_handle, gfp);
	260	return NULL;
	261	}
	262
	263	static inline void dma_free_coherent(struct device *dev, size_t size,
	264	void *vaddr, dma_addr_t bus)
	265	{
	266	struct dma_mapping_ops *ops = get_dma_ops(dev);
	267
	268	WARN_ON(irqs_disabled()); /* for portability */
	269
	270	if (dma_release_from_coherent(dev, get_order(size), vaddr))
	271	return;
	272
	273	if (ops->free_coherent)
	274	ops->free_coherent(dev, size, vaddr, bus);
	275	}
b7107a3d	276
6f536635	277	#endif