1 # SPDX-License-Identifier: GPL-2.0-only 1 # SPDX-License-Identifier: GPL-2.0-only
2 2
3 config NO_DMA <<
4 bool <<
5 <<
6 config HAS_DMA 3 config HAS_DMA
7 bool 4 bool
8 depends on !NO_DMA 5 depends on !NO_DMA
9 default y 6 default y
10 7
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 8 config NEED_SG_DMA_LENGTH
30 bool 9 bool
31 10
32 config NEED_DMA_MAP_STATE 11 config NEED_DMA_MAP_STATE
33 bool 12 bool
34 13
35 config ARCH_DMA_ADDR_T_64BIT 14 config ARCH_DMA_ADDR_T_64BIT
36 def_bool 64BIT || PHYS_ADDR_T_64BIT 15 def_bool 64BIT || PHYS_ADDR_T_64BIT
37 16
>> 17 config ARCH_HAS_DMA_COHERENCE_H
>> 18 bool
>> 19
38 config ARCH_HAS_DMA_SET_MASK 20 config ARCH_HAS_DMA_SET_MASK
39 bool 21 bool
40 22
41 # 23 #
42 # Select this option if the architecture needs 24 # Select this option if the architecture needs special handling for
43 # DMA_ATTR_WRITE_COMBINE. Normally the "uncac 25 # DMA_ATTR_WRITE_COMBINE. Normally the "uncached" mapping should be what
44 # people think of when saying write combine, s !! 26 # people thing of when saying write combine, so very few platforms should
45 # need to enable this. 27 # need to enable this.
46 # 28 #
47 config ARCH_HAS_DMA_WRITE_COMBINE 29 config ARCH_HAS_DMA_WRITE_COMBINE
48 bool 30 bool
49 31
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 32 config DMA_DECLARE_COHERENT
57 bool 33 bool
58 34
59 config ARCH_HAS_SETUP_DMA_OPS 35 config ARCH_HAS_SETUP_DMA_OPS
60 bool 36 bool
61 37
62 config ARCH_HAS_TEARDOWN_DMA_OPS 38 config ARCH_HAS_TEARDOWN_DMA_OPS
63 bool 39 bool
64 40
65 config ARCH_HAS_SYNC_DMA_FOR_DEVICE 41 config ARCH_HAS_SYNC_DMA_FOR_DEVICE
66 bool 42 bool
67 43
68 config ARCH_HAS_SYNC_DMA_FOR_CPU 44 config ARCH_HAS_SYNC_DMA_FOR_CPU
69 bool 45 bool
70 select NEED_DMA_MAP_STATE 46 select NEED_DMA_MAP_STATE
71 47
72 config ARCH_HAS_SYNC_DMA_FOR_CPU_ALL 48 config ARCH_HAS_SYNC_DMA_FOR_CPU_ALL
73 bool 49 bool
74 50
75 config ARCH_HAS_DMA_PREP_COHERENT 51 config ARCH_HAS_DMA_PREP_COHERENT
76 bool 52 bool
77 53
78 config ARCH_HAS_FORCE_DMA_UNENCRYPTED 54 config ARCH_HAS_FORCE_DMA_UNENCRYPTED
79 bool 55 bool
80 56
81 # !! 57 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 58 bool
87 59
88 config SWIOTLB !! 60 config DMA_VIRT_OPS
89 bool 61 bool
90 select NEED_DMA_MAP_STATE !! 62 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 63
103 If unsure, say N. !! 64 config SWIOTLB
104 <<
105 config DMA_BOUNCE_UNALIGNED_KMALLOC <<
106 bool 65 bool
107 depends on SWIOTLB !! 66 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 67
127 # 68 #
128 # Should be selected if we can mmap non-cohere 69 # Should be selected if we can mmap non-coherent mappings to userspace.
129 # The only thing that is really required is a 70 # The only thing that is really required is a way to set an uncached bit
130 # in the pagetables 71 # in the pagetables
131 # 72 #
132 config DMA_NONCOHERENT_MMAP 73 config DMA_NONCOHERENT_MMAP
133 default y if !MMU <<
134 bool 74 bool
135 75
136 config DMA_COHERENT_POOL !! 76 config DMA_REMAP
>> 77 depends on MMU
137 select GENERIC_ALLOCATOR 78 select GENERIC_ALLOCATOR
138 bool !! 79 select DMA_NONCOHERENT_MMAP
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 80 bool
145 81
146 config DMA_DIRECT_REMAP 82 config DMA_DIRECT_REMAP
147 bool 83 bool
148 select DMA_COHERENT_POOL !! 84 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 85
160 config DMA_CMA 86 config DMA_CMA
161 bool "DMA Contiguous Memory Allocator" 87 bool "DMA Contiguous Memory Allocator"
162 depends on HAVE_DMA_CONTIGUOUS && CMA 88 depends on HAVE_DMA_CONTIGUOUS && CMA
163 help 89 help
164 This enables the Contiguous Memory A 90 This enables the Contiguous Memory Allocator which allows drivers
165 to allocate big physically-contiguou 91 to allocate big physically-contiguous blocks of memory for use with
166 hardware components that do not supp 92 hardware components that do not support I/O map nor scatter-gather.
167 93
168 You can disable CMA by specifying "c 94 You can disable CMA by specifying "cma=0" on the kernel's command
169 line. 95 line.
170 96
171 For more information see <kernel/dma !! 97 For more information see <include/linux/dma-contiguous.h>.
172 If unsure, say "n". 98 If unsure, say "n".
173 99
174 if DMA_CMA 100 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:" 101 comment "Default contiguous memory area size:"
188 102
189 config CMA_SIZE_MBYTES 103 config CMA_SIZE_MBYTES
190 int "Size in Mega Bytes" 104 int "Size in Mega Bytes"
191 depends on !CMA_SIZE_SEL_PERCENTAGE 105 depends on !CMA_SIZE_SEL_PERCENTAGE
192 default 0 if X86 106 default 0 if X86
193 default 16 107 default 16
194 help 108 help
195 Defines the size (in MiB) of the def 109 Defines the size (in MiB) of the default memory area for Contiguous
196 Memory Allocator. If the size of 0 110 Memory Allocator. If the size of 0 is selected, CMA is disabled by
197 default, but it can be enabled by pa 111 default, but it can be enabled by passing cma=size[MG] to the kernel.
198 112
199 113
200 config CMA_SIZE_PERCENTAGE 114 config CMA_SIZE_PERCENTAGE
201 int "Percentage of total memory" 115 int "Percentage of total memory"
202 depends on !CMA_SIZE_SEL_MBYTES 116 depends on !CMA_SIZE_SEL_MBYTES
203 default 0 if X86 117 default 0 if X86
204 default 10 118 default 10
205 help 119 help
206 Defines the size of the default memo 120 Defines the size of the default memory area for Contiguous Memory
207 Allocator as a percentage of the tot 121 Allocator as a percentage of the total memory in the system.
208 If 0 percent is selected, CMA is dis 122 If 0 percent is selected, CMA is disabled by default, but it can be
209 enabled by passing cma=size[MG] to t 123 enabled by passing cma=size[MG] to the kernel.
210 124
211 choice 125 choice
212 prompt "Selected region size" 126 prompt "Selected region size"
213 default CMA_SIZE_SEL_MBYTES 127 default CMA_SIZE_SEL_MBYTES
214 128
215 config CMA_SIZE_SEL_MBYTES 129 config CMA_SIZE_SEL_MBYTES
216 bool "Use mega bytes value only" 130 bool "Use mega bytes value only"
217 131
218 config CMA_SIZE_SEL_PERCENTAGE 132 config CMA_SIZE_SEL_PERCENTAGE
219 bool "Use percentage value only" 133 bool "Use percentage value only"
220 134
221 config CMA_SIZE_SEL_MIN 135 config CMA_SIZE_SEL_MIN
222 bool "Use lower value (minimum)" 136 bool "Use lower value (minimum)"
223 137
224 config CMA_SIZE_SEL_MAX 138 config CMA_SIZE_SEL_MAX
225 bool "Use higher value (maximum)" 139 bool "Use higher value (maximum)"
226 140
227 endchoice 141 endchoice
228 142
229 config CMA_ALIGNMENT 143 config CMA_ALIGNMENT
230 int "Maximum PAGE_SIZE order of alignm 144 int "Maximum PAGE_SIZE order of alignment for contiguous buffers"
231 range 2 12 !! 145 range 4 12
232 default 8 146 default 8
233 help 147 help
234 DMA mapping framework by default ali 148 DMA mapping framework by default aligns all buffers to the smallest
235 PAGE_SIZE order which is greater tha 149 PAGE_SIZE order which is greater than or equal to the requested buffer
236 size. This works well for buffers up 150 size. This works well for buffers up to a few hundreds kilobytes, but
237 for larger buffers it just a memory 151 for larger buffers it just a memory waste. With this parameter you can
238 specify the maximum PAGE_SIZE order 152 specify the maximum PAGE_SIZE order for contiguous buffers. Larger
239 buffers will be aligned only to this 153 buffers will be aligned only to this specified order. The order is
240 expressed as a power of two multipli 154 expressed as a power of two multiplied by the PAGE_SIZE.
241 155
242 For example, if your system defaults 156 For example, if your system defaults to 4KiB pages, the order value
243 of 8 means that the buffers will be 157 of 8 means that the buffers will be aligned up to 1MiB only.
244 158
245 If unsure, leave the default value " 159 If unsure, leave the default value "8".
246 160
247 endif 161 endif
248 162
249 config DMA_API_DEBUG 163 config DMA_API_DEBUG
250 bool "Enable debugging of DMA-API usag 164 bool "Enable debugging of DMA-API usage"
251 select NEED_DMA_MAP_STATE 165 select NEED_DMA_MAP_STATE
252 help 166 help
253 Enable this option to debug the use 167 Enable this option to debug the use of the DMA API by device drivers.
254 With this option you will be able to 168 With this option you will be able to detect common bugs in device
255 drivers like double-freeing of DMA m 169 drivers like double-freeing of DMA mappings or freeing mappings that
256 were never allocated. 170 were never allocated.
257 171
>> 172 This also attempts to catch cases where a page owned by DMA is
>> 173 accessed by the cpu in a way that could cause data corruption. For
>> 174 example, this enables cow_user_page() to check that the source page is
>> 175 not undergoing DMA.
>> 176
258 This option causes a performance deg 177 This option causes a performance degradation. Use only if you want to
259 debug device drivers and dma interac 178 debug device drivers and dma interactions.
260 179
261 If unsure, say N. 180 If unsure, say N.
262 181
263 config DMA_API_DEBUG_SG 182 config DMA_API_DEBUG_SG
264 bool "Debug DMA scatter-gather usage" 183 bool "Debug DMA scatter-gather usage"
265 default y 184 default y
266 depends on DMA_API_DEBUG 185 depends on DMA_API_DEBUG
267 help 186 help
268 Perform extra checking that callers 187 Perform extra checking that callers of dma_map_sg() have respected the
269 appropriate segment length/boundary 188 appropriate segment length/boundary limits for the given device when
270 preparing DMA scatterlists. 189 preparing DMA scatterlists.
271 190
272 This is particularly likely to have 191 This is particularly likely to have been overlooked in cases where the
273 dma_map_sg() API is used for general 192 dma_map_sg() API is used for general bulk mapping of pages rather than
274 preparing literal scatter-gather des 193 preparing literal scatter-gather descriptors, where there is a risk of
275 unexpected behaviour from DMA API im 194 unexpected behaviour from DMA API implementations if the scatterlist
276 is technically out-of-spec. 195 is technically out-of-spec.
277 196
278 If unsure, say N. 197 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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