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