1 # SPDX-License-Identifier: GPL-2.0-only
2
3 config NO_DMA
4 bool
5
6 config HAS_DMA
7 bool
8 depends on !NO_DMA
9 default y
10
11 config DMA_OPS_HELPERS
12 bool
13
14 #
15 # IOMMU drivers that can bypass the IOMMU code
16 # mapping fast path should select this option
17 # flag in struct device where applicable
18 #
19 config DMA_OPS_BYPASS
20 bool
21
22 # Lets platform IOMMU driver choose between by
23 config ARCH_HAS_DMA_MAP_DIRECT
24 bool
25
26 config NEED_SG_DMA_FLAGS
27 bool
28
29 config NEED_SG_DMA_LENGTH
30 bool
31
32 config NEED_DMA_MAP_STATE
33 bool
34
35 config ARCH_DMA_ADDR_T_64BIT
36 def_bool 64BIT || PHYS_ADDR_T_64BIT
37
38 config ARCH_HAS_DMA_SET_MASK
39 bool
40
41 #
42 # Select this option if the architecture needs
43 # DMA_ATTR_WRITE_COMBINE. Normally the "uncac
44 # people think of when saying write combine, s
45 # need to enable this.
46 #
47 config ARCH_HAS_DMA_WRITE_COMBINE
48 bool
49
50 #
51 # Select if the architectures provides the arc
52 #
53 config ARCH_HAS_DMA_MARK_CLEAN
54 bool
55
56 config DMA_DECLARE_COHERENT
57 bool
58
59 config ARCH_HAS_SETUP_DMA_OPS
60 bool
61
62 config ARCH_HAS_TEARDOWN_DMA_OPS
63 bool
64
65 config ARCH_HAS_SYNC_DMA_FOR_DEVICE
66 bool
67
68 config ARCH_HAS_SYNC_DMA_FOR_CPU
69 bool
70 select NEED_DMA_MAP_STATE
71
72 config ARCH_HAS_SYNC_DMA_FOR_CPU_ALL
73 bool
74
75 config ARCH_HAS_DMA_PREP_COHERENT
76 bool
77
78 config ARCH_HAS_FORCE_DMA_UNENCRYPTED
79 bool
80
81 #
82 # Select this option if the architecture assum
83 # by default.
84 #
85 config ARCH_DMA_DEFAULT_COHERENT
86 bool
87
88 config SWIOTLB
89 bool
90 select NEED_DMA_MAP_STATE
91
92 config SWIOTLB_DYNAMIC
93 bool "Dynamic allocation of DMA bounce
94 default n
95 depends on SWIOTLB
96 help
97 This enables dynamic resizing of the
98 starts with one memory pool at boot
99 pools as needed. To reduce run-time
100 may have to specify a smaller size o
101 "swiotlb=" on the kernel command lin
102
103 If unsure, say N.
104
105 config DMA_BOUNCE_UNALIGNED_KMALLOC
106 bool
107 depends on SWIOTLB
108
109 config DMA_NEED_SYNC
110 def_bool ARCH_HAS_SYNC_DMA_FOR_DEVICE
111 ARCH_HAS_SYNC_DMA_FOR_CPU_ALL
112 ARCH_HAS_DMA_OPS || SWIOTLB
113
114 config DMA_RESTRICTED_POOL
115 bool "DMA Restricted Pool"
116 depends on OF && OF_RESERVED_MEM && SW
117 help
118 This enables support for restricted
119 DMA memory protection on systems wit
120 capabilities, such as those lacking
121
122 For more information see
123 <Documentation/devicetree/bindings/r
124 and <kernel/dma/swiotlb.c>.
125 If unsure, say "n".
126
127 #
128 # Should be selected if we can mmap non-cohere
129 # The only thing that is really required is a
130 # in the pagetables
131 #
132 config DMA_NONCOHERENT_MMAP
133 default y if !MMU
134 bool
135
136 config DMA_COHERENT_POOL
137 select GENERIC_ALLOCATOR
138 bool
139
140 config DMA_GLOBAL_POOL
141 select DMA_DECLARE_COHERENT
142 depends on !ARCH_HAS_DMA_SET_UNCACHED
143 depends on !DMA_DIRECT_REMAP
144 bool
145
146 config DMA_DIRECT_REMAP
147 bool
148 select DMA_COHERENT_POOL
149 select DMA_NONCOHERENT_MMAP
150
151 #
152 # Fallback to arch code for DMA allocations.
153 #
154 config ARCH_HAS_DMA_ALLOC
155 depends on !ARCH_HAS_DMA_SET_UNCACHED
156 depends on !DMA_DIRECT_REMAP
157 depends on !DMA_GLOBAL_POOL
158 bool
159
160 config DMA_CMA
161 bool "DMA Contiguous Memory Allocator"
162 depends on HAVE_DMA_CONTIGUOUS && CMA
163 help
164 This enables the Contiguous Memory A
165 to allocate big physically-contiguou
166 hardware components that do not supp
167
168 You can disable CMA by specifying "c
169 line.
170
171 For more information see <kernel/dma
172 If unsure, say "n".
173
174 if DMA_CMA
175
176 config DMA_NUMA_CMA
177 bool "Enable separate DMA Contiguous M
178 depends on NUMA
179 help
180 Enable this option to get numa CMA a
181 can get local memory by DMA coherent
182
183 You can set the size of pernuma CMA
184 or set the node id and its size of C
185 <node>:size[,<node>:size]" on the ke
186
187 comment "Default contiguous memory area size:"
188
189 config CMA_SIZE_MBYTES
190 int "Size in Mega Bytes"
191 depends on !CMA_SIZE_SEL_PERCENTAGE
192 default 0 if X86
193 default 16
194 help
195 Defines the size (in MiB) of the def
196 Memory Allocator. If the size of 0
197 default, but it can be enabled by pa
198
199
200 config CMA_SIZE_PERCENTAGE
201 int "Percentage of total memory"
202 depends on !CMA_SIZE_SEL_MBYTES
203 default 0 if X86
204 default 10
205 help
206 Defines the size of the default memo
207 Allocator as a percentage of the tot
208 If 0 percent is selected, CMA is dis
209 enabled by passing cma=size[MG] to t
210
211 choice
212 prompt "Selected region size"
213 default CMA_SIZE_SEL_MBYTES
214
215 config CMA_SIZE_SEL_MBYTES
216 bool "Use mega bytes value only"
217
218 config CMA_SIZE_SEL_PERCENTAGE
219 bool "Use percentage value only"
220
221 config CMA_SIZE_SEL_MIN
222 bool "Use lower value (minimum)"
223
224 config CMA_SIZE_SEL_MAX
225 bool "Use higher value (maximum)"
226
227 endchoice
228
229 config CMA_ALIGNMENT
230 int "Maximum PAGE_SIZE order of alignm
231 range 2 12
232 default 8
233 help
234 DMA mapping framework by default ali
235 PAGE_SIZE order which is greater tha
236 size. This works well for buffers up
237 for larger buffers it just a memory
238 specify the maximum PAGE_SIZE order
239 buffers will be aligned only to this
240 expressed as a power of two multipli
241
242 For example, if your system defaults
243 of 8 means that the buffers will be
244
245 If unsure, leave the default value "
246
247 endif
248
249 config DMA_API_DEBUG
250 bool "Enable debugging of DMA-API usag
251 select NEED_DMA_MAP_STATE
252 help
253 Enable this option to debug the use
254 With this option you will be able to
255 drivers like double-freeing of DMA m
256 were never allocated.
257
258 This option causes a performance deg
259 debug device drivers and dma interac
260
261 If unsure, say N.
262
263 config DMA_API_DEBUG_SG
264 bool "Debug DMA scatter-gather usage"
265 default y
266 depends on DMA_API_DEBUG
267 help
268 Perform extra checking that callers
269 appropriate segment length/boundary
270 preparing DMA scatterlists.
271
272 This is particularly likely to have
273 dma_map_sg() API is used for general
274 preparing literal scatter-gather des
275 unexpected behaviour from DMA API im
276 is technically out-of-spec.
277
278 If unsure, say N.
279
280 config DMA_MAP_BENCHMARK
281 bool "Enable benchmarking of streaming
282 depends on DEBUG_FS
283 help
284 Provides /sys/kernel/debug/dma_map_b
285 performance of dma_(un)map_page.
286
287 See tools/testing/selftests/dma/dma_
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