dma-mapping.h revision 325936 
1/*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice unmodified, this list of conditions, and the following
13 *    disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * $FreeBSD: stable/11/sys/compat/linuxkpi/common/include/linux/dma-mapping.h 325936 2017-11-17 15:27:52Z hselasky $
30 */
31#ifndef	_LINUX_DMA_MAPPING_H_
32#define _LINUX_DMA_MAPPING_H_
33
34#include <linux/types.h>
35#include <linux/device.h>
36#include <linux/err.h>
37#include <linux/dma-attrs.h>
38#include <linux/scatterlist.h>
39#include <linux/mm.h>
40#include <linux/page.h>
41
42#include <sys/systm.h>
43#include <sys/malloc.h>
44
45#include <vm/vm.h>
46#include <vm/vm_page.h>
47#include <vm/pmap.h>
48
49#include <machine/bus.h>
50
51enum dma_data_direction {
52	DMA_BIDIRECTIONAL = 0,
53	DMA_TO_DEVICE = 1,
54	DMA_FROM_DEVICE = 2,
55	DMA_NONE = 3,
56};
57
58struct dma_map_ops {
59	void* (*alloc_coherent)(struct device *dev, size_t size,
60	    dma_addr_t *dma_handle, gfp_t gfp);
61	void (*free_coherent)(struct device *dev, size_t size,
62	    void *vaddr, dma_addr_t dma_handle);
63	dma_addr_t (*map_page)(struct device *dev, struct page *page,
64	    unsigned long offset, size_t size, enum dma_data_direction dir,
65	    struct dma_attrs *attrs);
66	void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
67	    size_t size, enum dma_data_direction dir, struct dma_attrs *attrs);
68	int (*map_sg)(struct device *dev, struct scatterlist *sg,
69	    int nents, enum dma_data_direction dir, struct dma_attrs *attrs);
70	void (*unmap_sg)(struct device *dev, struct scatterlist *sg, int nents,
71	    enum dma_data_direction dir, struct dma_attrs *attrs);
72	void (*sync_single_for_cpu)(struct device *dev, dma_addr_t dma_handle,
73	    size_t size, enum dma_data_direction dir);
74	void (*sync_single_for_device)(struct device *dev,
75	    dma_addr_t dma_handle, size_t size, enum dma_data_direction dir);
76	void (*sync_single_range_for_cpu)(struct device *dev,
77	    dma_addr_t dma_handle, unsigned long offset, size_t size,
78	    enum dma_data_direction dir);
79	void (*sync_single_range_for_device)(struct device *dev,
80	    dma_addr_t dma_handle, unsigned long offset, size_t size,
81	    enum dma_data_direction dir);
82	void (*sync_sg_for_cpu)(struct device *dev, struct scatterlist *sg,
83	    int nents, enum dma_data_direction dir);
84	void (*sync_sg_for_device)(struct device *dev, struct scatterlist *sg,
85	    int nents, enum dma_data_direction dir);
86	int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
87	int (*dma_supported)(struct device *dev, u64 mask);
88	int is_phys;
89};
90
91#define	DMA_BIT_MASK(n)	((2ULL << ((n) - 1)) - 1ULL)
92
93static inline int
94dma_supported(struct device *dev, u64 mask)
95{
96
97	/* XXX busdma takes care of this elsewhere. */
98	return (1);
99}
100
101static inline int
102dma_set_mask(struct device *dev, u64 dma_mask)
103{
104
105	if (!dev->dma_mask || !dma_supported(dev, dma_mask))
106		return -EIO;
107
108	*dev->dma_mask = dma_mask;
109	return (0);
110}
111
112static inline int
113dma_set_coherent_mask(struct device *dev, u64 mask)
114{
115
116	if (!dma_supported(dev, mask))
117		return -EIO;
118	/* XXX Currently we don't support a separate coherent mask. */
119	return 0;
120}
121
122static inline void *
123dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
124    gfp_t flag)
125{
126	vm_paddr_t high;
127	size_t align;
128	void *mem;
129
130	if (dev != NULL && dev->dma_mask)
131		high = *dev->dma_mask;
132	else
133		high = BUS_SPACE_MAXADDR_32BIT;
134	align = PAGE_SIZE << get_order(size);
135	mem = (void *)kmem_alloc_contig(kmem_arena, size, flag, 0, high, align,
136	    0, VM_MEMATTR_DEFAULT);
137	if (mem)
138		*dma_handle = vtophys(mem);
139	else
140		*dma_handle = 0;
141	return (mem);
142}
143
144static inline void *
145dma_zalloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
146    gfp_t flag)
147{
148
149	return (dma_alloc_coherent(dev, size, dma_handle, flag | __GFP_ZERO));
150}
151
152static inline void
153dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
154    dma_addr_t dma_handle)
155{
156
157	kmem_free(kmem_arena, (vm_offset_t)cpu_addr, size);
158}
159
160/* XXX This only works with no iommu. */
161static inline dma_addr_t
162dma_map_single_attrs(struct device *dev, void *ptr, size_t size,
163    enum dma_data_direction dir, struct dma_attrs *attrs)
164{
165
166	return vtophys(ptr);
167}
168
169static inline void
170dma_unmap_single_attrs(struct device *dev, dma_addr_t addr, size_t size,
171    enum dma_data_direction dir, struct dma_attrs *attrs)
172{
173}
174
175static inline int
176dma_map_sg_attrs(struct device *dev, struct scatterlist *sgl, int nents,
177    enum dma_data_direction dir, struct dma_attrs *attrs)
178{
179	struct scatterlist *sg;
180	int i;
181
182	for_each_sg(sgl, sg, nents, i)
183		sg_dma_address(sg) = sg_phys(sg);
184
185	return (nents);
186}
187
188static inline void
189dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, int nents,
190    enum dma_data_direction dir, struct dma_attrs *attrs)
191{
192}
193
194static inline dma_addr_t
195dma_map_page(struct device *dev, struct page *page,
196    unsigned long offset, size_t size, enum dma_data_direction direction)
197{
198
199	return VM_PAGE_TO_PHYS(page) + offset;
200}
201
202static inline void
203dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
204    enum dma_data_direction direction)
205{
206}
207
208static inline void
209dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
210    enum dma_data_direction direction)
211{
212}
213
214static inline void
215dma_sync_single(struct device *dev, dma_addr_t addr, size_t size,
216    enum dma_data_direction dir)
217{
218	dma_sync_single_for_cpu(dev, addr, size, dir);
219}
220
221static inline void
222dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
223    size_t size, enum dma_data_direction direction)
224{
225}
226
227static inline void
228dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
229    enum dma_data_direction direction)
230{
231}
232
233static inline void
234dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
235    enum dma_data_direction direction)
236{
237}
238
239static inline void
240dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
241    unsigned long offset, size_t size, int direction)
242{
243}
244
245static inline void
246dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
247    unsigned long offset, size_t size, int direction)
248{
249}
250
251static inline int
252dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
253{
254
255	return (0);
256}
257
258static inline unsigned int dma_set_max_seg_size(struct device *dev,
259                                                 unsigned int size)
260{
261        return (0);
262}
263
264
265#define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, NULL)
266#define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, NULL)
267#define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, NULL)
268#define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, NULL)
269
270#define	DEFINE_DMA_UNMAP_ADDR(name)		dma_addr_t name
271#define	DEFINE_DMA_UNMAP_LEN(name)		__u32 name
272#define	dma_unmap_addr(p, name)			((p)->name)
273#define	dma_unmap_addr_set(p, name, v)		(((p)->name) = (v))
274#define	dma_unmap_len(p, name)			((p)->name)
275#define	dma_unmap_len_set(p, name, v)		(((p)->name) = (v))
276
277extern int uma_align_cache;
278#define	dma_get_cache_alignment()	uma_align_cache
279
280#endif	/* _LINUX_DMA_MAPPING_H_ */
281