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33#include <linux/scatterlist.h>
34#include <rdma/ib_verbs.h>
35
36#include "ipath_verbs.h"
37
38#define BAD_DMA_ADDRESS ((u64) 0)
39
40
41
42
43
44
45
46
47
48
49static int ipath_mapping_error(struct ib_device *dev, u64 dma_addr)
50{
51 return dma_addr == BAD_DMA_ADDRESS;
52}
53
54static u64 ipath_dma_map_single(struct ib_device *dev,
55 void *cpu_addr, size_t size,
56 enum dma_data_direction direction)
57{
58 BUG_ON(!valid_dma_direction(direction));
59 return (u64) cpu_addr;
60}
61
62static void ipath_dma_unmap_single(struct ib_device *dev,
63 u64 addr, size_t size,
64 enum dma_data_direction direction)
65{
66 BUG_ON(!valid_dma_direction(direction));
67}
68
69static u64 ipath_dma_map_page(struct ib_device *dev,
70 struct page *page,
71 unsigned long offset,
72 size_t size,
73 enum dma_data_direction direction)
74{
75 u64 addr;
76
77 BUG_ON(!valid_dma_direction(direction));
78
79 if (offset + size > PAGE_SIZE) {
80 addr = BAD_DMA_ADDRESS;
81 goto done;
82 }
83
84 addr = (u64) page_address(page);
85 if (addr)
86 addr += offset;
87
88
89done:
90 return addr;
91}
92
93static void ipath_dma_unmap_page(struct ib_device *dev,
94 u64 addr, size_t size,
95 enum dma_data_direction direction)
96{
97 BUG_ON(!valid_dma_direction(direction));
98}
99
100static int ipath_map_sg(struct ib_device *dev, struct scatterlist *sgl,
101 int nents, enum dma_data_direction direction)
102{
103 struct scatterlist *sg;
104 u64 addr;
105 int i;
106 int ret = nents;
107
108 BUG_ON(!valid_dma_direction(direction));
109
110 for_each_sg(sgl, sg, nents, i) {
111 addr = (u64) page_address(sg_page(sg));
112
113 if (!addr) {
114 ret = 0;
115 break;
116 }
117 }
118 return ret;
119}
120
121static void ipath_unmap_sg(struct ib_device *dev,
122 struct scatterlist *sg, int nents,
123 enum dma_data_direction direction)
124{
125 BUG_ON(!valid_dma_direction(direction));
126}
127
128static u64 ipath_sg_dma_address(struct ib_device *dev, struct scatterlist *sg)
129{
130 u64 addr = (u64) page_address(sg_page(sg));
131
132 if (addr)
133 addr += sg->offset;
134 return addr;
135}
136
137static unsigned int ipath_sg_dma_len(struct ib_device *dev,
138 struct scatterlist *sg)
139{
140 return sg->length;
141}
142
143static void ipath_sync_single_for_cpu(struct ib_device *dev,
144 u64 addr,
145 size_t size,
146 enum dma_data_direction dir)
147{
148}
149
150static void ipath_sync_single_for_device(struct ib_device *dev,
151 u64 addr,
152 size_t size,
153 enum dma_data_direction dir)
154{
155}
156
157static void *ipath_dma_alloc_coherent(struct ib_device *dev, size_t size,
158 u64 *dma_handle, gfp_t flag)
159{
160 struct page *p;
161 void *addr = NULL;
162
163 p = alloc_pages(flag, get_order(size));
164 if (p)
165 addr = page_address(p);
166 if (dma_handle)
167 *dma_handle = (u64) addr;
168 return addr;
169}
170
171static void ipath_dma_free_coherent(struct ib_device *dev, size_t size,
172 void *cpu_addr, u64 dma_handle)
173{
174 free_pages((unsigned long) cpu_addr, get_order(size));
175}
176
177struct ib_dma_mapping_ops ipath_dma_mapping_ops = {
178 ipath_mapping_error,
179 ipath_dma_map_single,
180 ipath_dma_unmap_single,
181 ipath_dma_map_page,
182 ipath_dma_unmap_page,
183 ipath_map_sg,
184 ipath_unmap_sg,
185 ipath_sg_dma_address,
186 ipath_sg_dma_len,
187 ipath_sync_single_for_cpu,
188 ipath_sync_single_for_device,
189 ipath_dma_alloc_coherent,
190 ipath_dma_free_coherent
191};
192