1 # SPDX-License-Identifier: GPL-2.0-only <<
2 <<
3 config NO_DMA <<
4 bool <<
5 1
6 config HAS_DMA 2 config HAS_DMA
7 bool 3 bool
8 depends on !NO_DMA 4 depends on !NO_DMA
9 default y 5 default y
10 6
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 7 config NEED_SG_DMA_LENGTH
30 bool 8 bool
31 9
32 config NEED_DMA_MAP_STATE 10 config NEED_DMA_MAP_STATE
33 bool 11 bool
34 12
35 config ARCH_DMA_ADDR_T_64BIT 13 config ARCH_DMA_ADDR_T_64BIT
36 def_bool 64BIT || PHYS_ADDR_T_64BIT 14 def_bool 64BIT || PHYS_ADDR_T_64BIT
37 15
38 config ARCH_HAS_DMA_SET_MASK !! 16 config ARCH_HAS_DMA_COHERENCE_H
39 bool 17 bool
40 18
41 # !! 19 config ARCH_HAS_DMA_SET_MASK
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 20 bool
55 21
56 config DMA_DECLARE_COHERENT 22 config DMA_DECLARE_COHERENT
57 bool 23 bool
58 24
59 config ARCH_HAS_SETUP_DMA_OPS 25 config ARCH_HAS_SETUP_DMA_OPS
60 bool 26 bool
61 27
62 config ARCH_HAS_TEARDOWN_DMA_OPS 28 config ARCH_HAS_TEARDOWN_DMA_OPS
63 bool 29 bool
64 30
65 config ARCH_HAS_SYNC_DMA_FOR_DEVICE 31 config ARCH_HAS_SYNC_DMA_FOR_DEVICE
66 bool 32 bool
67 33
68 config ARCH_HAS_SYNC_DMA_FOR_CPU 34 config ARCH_HAS_SYNC_DMA_FOR_CPU
69 bool 35 bool
70 select NEED_DMA_MAP_STATE 36 select NEED_DMA_MAP_STATE
71 37
72 config ARCH_HAS_SYNC_DMA_FOR_CPU_ALL 38 config ARCH_HAS_SYNC_DMA_FOR_CPU_ALL
73 bool 39 bool
74 40
75 config ARCH_HAS_DMA_PREP_COHERENT !! 41 config ARCH_HAS_DMA_COHERENT_TO_PFN
76 bool 42 bool
77 43
78 config ARCH_HAS_FORCE_DMA_UNENCRYPTED !! 44 config ARCH_HAS_DMA_MMAP_PGPROT
79 bool 45 bool
80 46
81 # !! 47 config DMA_NONCOHERENT_CACHE_SYNC
82 # Select this option if the architecture assum <<
83 # by default. <<
84 # <<
85 config ARCH_DMA_DEFAULT_COHERENT <<
86 bool 48 bool
87 49
88 config SWIOTLB !! 50 config DMA_VIRT_OPS
89 bool 51 bool
90 select NEED_DMA_MAP_STATE !! 52 depends on HAS_DMA
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 53
103 If unsure, say N. !! 54 config SWIOTLB
104 <<
105 config DMA_BOUNCE_UNALIGNED_KMALLOC <<
106 bool 55 bool
107 depends on SWIOTLB !! 56 select NEED_DMA_MAP_STATE
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 57
127 # !! 58 config DMA_REMAP
128 # Should be selected if we can mmap non-cohere !! 59 depends on MMU
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 60 bool
145 61
146 config DMA_DIRECT_REMAP 62 config DMA_DIRECT_REMAP
147 bool 63 bool
148 select DMA_COHERENT_POOL !! 64 select DMA_REMAP
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 65
160 config DMA_CMA 66 config DMA_CMA
161 bool "DMA Contiguous Memory Allocator" 67 bool "DMA Contiguous Memory Allocator"
162 depends on HAVE_DMA_CONTIGUOUS && CMA 68 depends on HAVE_DMA_CONTIGUOUS && CMA
163 help 69 help
164 This enables the Contiguous Memory A 70 This enables the Contiguous Memory Allocator which allows drivers
165 to allocate big physically-contiguou 71 to allocate big physically-contiguous blocks of memory for use with
166 hardware components that do not supp 72 hardware components that do not support I/O map nor scatter-gather.
167 73
168 You can disable CMA by specifying "c 74 You can disable CMA by specifying "cma=0" on the kernel's command
169 line. 75 line.
170 76
171 For more information see <kernel/dma !! 77 For more information see <include/linux/dma-contiguous.h>.
172 If unsure, say "n". 78 If unsure, say "n".
173 79
174 if DMA_CMA 80 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:" 81 comment "Default contiguous memory area size:"
188 82
189 config CMA_SIZE_MBYTES 83 config CMA_SIZE_MBYTES
190 int "Size in Mega Bytes" 84 int "Size in Mega Bytes"
191 depends on !CMA_SIZE_SEL_PERCENTAGE 85 depends on !CMA_SIZE_SEL_PERCENTAGE
192 default 0 if X86 86 default 0 if X86
193 default 16 87 default 16
194 help 88 help
195 Defines the size (in MiB) of the def 89 Defines the size (in MiB) of the default memory area for Contiguous
196 Memory Allocator. If the size of 0 90 Memory Allocator. If the size of 0 is selected, CMA is disabled by
197 default, but it can be enabled by pa 91 default, but it can be enabled by passing cma=size[MG] to the kernel.
198 92
199 93
200 config CMA_SIZE_PERCENTAGE 94 config CMA_SIZE_PERCENTAGE
201 int "Percentage of total memory" 95 int "Percentage of total memory"
202 depends on !CMA_SIZE_SEL_MBYTES 96 depends on !CMA_SIZE_SEL_MBYTES
203 default 0 if X86 97 default 0 if X86
204 default 10 98 default 10
205 help 99 help
206 Defines the size of the default memo 100 Defines the size of the default memory area for Contiguous Memory
207 Allocator as a percentage of the tot 101 Allocator as a percentage of the total memory in the system.
208 If 0 percent is selected, CMA is dis 102 If 0 percent is selected, CMA is disabled by default, but it can be
209 enabled by passing cma=size[MG] to t 103 enabled by passing cma=size[MG] to the kernel.
210 104
211 choice 105 choice
212 prompt "Selected region size" 106 prompt "Selected region size"
213 default CMA_SIZE_SEL_MBYTES 107 default CMA_SIZE_SEL_MBYTES
214 108
215 config CMA_SIZE_SEL_MBYTES 109 config CMA_SIZE_SEL_MBYTES
216 bool "Use mega bytes value only" 110 bool "Use mega bytes value only"
217 111
218 config CMA_SIZE_SEL_PERCENTAGE 112 config CMA_SIZE_SEL_PERCENTAGE
219 bool "Use percentage value only" 113 bool "Use percentage value only"
220 114
221 config CMA_SIZE_SEL_MIN 115 config CMA_SIZE_SEL_MIN
222 bool "Use lower value (minimum)" 116 bool "Use lower value (minimum)"
223 117
224 config CMA_SIZE_SEL_MAX 118 config CMA_SIZE_SEL_MAX
225 bool "Use higher value (maximum)" 119 bool "Use higher value (maximum)"
226 120
227 endchoice 121 endchoice
228 122
229 config CMA_ALIGNMENT 123 config CMA_ALIGNMENT
230 int "Maximum PAGE_SIZE order of alignm 124 int "Maximum PAGE_SIZE order of alignment for contiguous buffers"
231 range 2 12 !! 125 range 4 12
232 default 8 126 default 8
233 help 127 help
234 DMA mapping framework by default ali 128 DMA mapping framework by default aligns all buffers to the smallest
235 PAGE_SIZE order which is greater tha 129 PAGE_SIZE order which is greater than or equal to the requested buffer
236 size. This works well for buffers up 130 size. This works well for buffers up to a few hundreds kilobytes, but
237 for larger buffers it just a memory 131 for larger buffers it just a memory waste. With this parameter you can
238 specify the maximum PAGE_SIZE order 132 specify the maximum PAGE_SIZE order for contiguous buffers. Larger
239 buffers will be aligned only to this 133 buffers will be aligned only to this specified order. The order is
240 expressed as a power of two multipli 134 expressed as a power of two multiplied by the PAGE_SIZE.
241 135
242 For example, if your system defaults 136 For example, if your system defaults to 4KiB pages, the order value
243 of 8 means that the buffers will be 137 of 8 means that the buffers will be aligned up to 1MiB only.
244 138
245 If unsure, leave the default value " 139 If unsure, leave the default value "8".
246 140
247 endif 141 endif
248 142
249 config DMA_API_DEBUG 143 config DMA_API_DEBUG
250 bool "Enable debugging of DMA-API usag 144 bool "Enable debugging of DMA-API usage"
251 select NEED_DMA_MAP_STATE 145 select NEED_DMA_MAP_STATE
252 help 146 help
253 Enable this option to debug the use 147 Enable this option to debug the use of the DMA API by device drivers.
254 With this option you will be able to 148 With this option you will be able to detect common bugs in device
255 drivers like double-freeing of DMA m 149 drivers like double-freeing of DMA mappings or freeing mappings that
256 were never allocated. 150 were never allocated.
257 151
>> 152 This also attempts to catch cases where a page owned by DMA is
>> 153 accessed by the cpu in a way that could cause data corruption. For
>> 154 example, this enables cow_user_page() to check that the source page is
>> 155 not undergoing DMA.
>> 156
258 This option causes a performance deg 157 This option causes a performance degradation. Use only if you want to
259 debug device drivers and dma interac 158 debug device drivers and dma interactions.
260 159
261 If unsure, say N. 160 If unsure, say N.
262 161
263 config DMA_API_DEBUG_SG 162 config DMA_API_DEBUG_SG
264 bool "Debug DMA scatter-gather usage" 163 bool "Debug DMA scatter-gather usage"
265 default y 164 default y
266 depends on DMA_API_DEBUG 165 depends on DMA_API_DEBUG
267 help 166 help
268 Perform extra checking that callers 167 Perform extra checking that callers of dma_map_sg() have respected the
269 appropriate segment length/boundary 168 appropriate segment length/boundary limits for the given device when
270 preparing DMA scatterlists. 169 preparing DMA scatterlists.
271 170
272 This is particularly likely to have 171 This is particularly likely to have been overlooked in cases where the
273 dma_map_sg() API is used for general 172 dma_map_sg() API is used for general bulk mapping of pages rather than
274 preparing literal scatter-gather des 173 preparing literal scatter-gather descriptors, where there is a risk of
275 unexpected behaviour from DMA API im 174 unexpected behaviour from DMA API implementations if the scatterlist
276 is technically out-of-spec. 175 is technically out-of-spec.
277 176
278 If unsure, say N. 177 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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