1 # SPDX-License-Identifier: GPL-2.0-only 1 # SPDX-License-Identifier: GPL-2.0-only
2 2
3 config NO_DMA 3 config NO_DMA
4 bool 4 bool
5 5
6 config HAS_DMA 6 config HAS_DMA
7 bool 7 bool
8 depends on !NO_DMA 8 depends on !NO_DMA
9 default y 9 default y
10 10
11 config DMA_OPS_HELPERS !! 11 config DMA_OPS
>> 12 depends on HAS_DMA
12 bool 13 bool
13 14
14 # 15 #
15 # IOMMU drivers that can bypass the IOMMU code 16 # IOMMU drivers that can bypass the IOMMU code and optionally use the direct
16 # mapping fast path should select this option 17 # mapping fast path should select this option and set the dma_ops_bypass
17 # flag in struct device where applicable 18 # flag in struct device where applicable
18 # 19 #
19 config DMA_OPS_BYPASS 20 config DMA_OPS_BYPASS
20 bool 21 bool
21 22
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 23 config NEED_SG_DMA_LENGTH
30 bool 24 bool
31 25
32 config NEED_DMA_MAP_STATE 26 config NEED_DMA_MAP_STATE
33 bool 27 bool
34 28
35 config ARCH_DMA_ADDR_T_64BIT 29 config ARCH_DMA_ADDR_T_64BIT
36 def_bool 64BIT || PHYS_ADDR_T_64BIT 30 def_bool 64BIT || PHYS_ADDR_T_64BIT
37 31
>> 32 config ARCH_HAS_DMA_COHERENCE_H
>> 33 bool
>> 34
38 config ARCH_HAS_DMA_SET_MASK 35 config ARCH_HAS_DMA_SET_MASK
39 bool 36 bool
40 37
41 # 38 #
42 # Select this option if the architecture needs 39 # Select this option if the architecture needs special handling for
43 # DMA_ATTR_WRITE_COMBINE. Normally the "uncac 40 # DMA_ATTR_WRITE_COMBINE. Normally the "uncached" mapping should be what
44 # people think of when saying write combine, s !! 41 # people thing of when saying write combine, so very few platforms should
45 # need to enable this. 42 # need to enable this.
46 # 43 #
47 config ARCH_HAS_DMA_WRITE_COMBINE 44 config ARCH_HAS_DMA_WRITE_COMBINE
48 bool 45 bool
49 46
50 # 47 #
51 # Select if the architectures provides the arc 48 # Select if the architectures provides the arch_dma_mark_clean hook
52 # 49 #
53 config ARCH_HAS_DMA_MARK_CLEAN 50 config ARCH_HAS_DMA_MARK_CLEAN
54 bool 51 bool
55 52
56 config DMA_DECLARE_COHERENT 53 config DMA_DECLARE_COHERENT
57 bool 54 bool
58 55
59 config ARCH_HAS_SETUP_DMA_OPS 56 config ARCH_HAS_SETUP_DMA_OPS
60 bool 57 bool
61 58
62 config ARCH_HAS_TEARDOWN_DMA_OPS 59 config ARCH_HAS_TEARDOWN_DMA_OPS
63 bool 60 bool
64 61
65 config ARCH_HAS_SYNC_DMA_FOR_DEVICE 62 config ARCH_HAS_SYNC_DMA_FOR_DEVICE
66 bool 63 bool
67 64
68 config ARCH_HAS_SYNC_DMA_FOR_CPU 65 config ARCH_HAS_SYNC_DMA_FOR_CPU
69 bool 66 bool
70 select NEED_DMA_MAP_STATE 67 select NEED_DMA_MAP_STATE
71 68
72 config ARCH_HAS_SYNC_DMA_FOR_CPU_ALL 69 config ARCH_HAS_SYNC_DMA_FOR_CPU_ALL
73 bool 70 bool
74 71
75 config ARCH_HAS_DMA_PREP_COHERENT 72 config ARCH_HAS_DMA_PREP_COHERENT
76 bool 73 bool
77 74
78 config ARCH_HAS_FORCE_DMA_UNENCRYPTED 75 config ARCH_HAS_FORCE_DMA_UNENCRYPTED
79 bool 76 bool
80 77
81 # !! 78 config DMA_VIRT_OPS
82 # Select this option if the architecture assum <<
83 # by default. <<
84 # <<
85 config ARCH_DMA_DEFAULT_COHERENT <<
86 bool 79 bool
>> 80 depends on HAS_DMA
>> 81 select DMA_OPS
87 82
88 config SWIOTLB 83 config SWIOTLB
89 bool 84 bool
90 select NEED_DMA_MAP_STATE 85 select NEED_DMA_MAP_STATE
91 86
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 # 87 #
128 # Should be selected if we can mmap non-cohere 88 # Should be selected if we can mmap non-coherent mappings to userspace.
129 # The only thing that is really required is a 89 # The only thing that is really required is a way to set an uncached bit
130 # in the pagetables 90 # in the pagetables
131 # 91 #
132 config DMA_NONCOHERENT_MMAP 92 config DMA_NONCOHERENT_MMAP
133 default y if !MMU 93 default y if !MMU
134 bool 94 bool
135 95
136 config DMA_COHERENT_POOL 96 config DMA_COHERENT_POOL
137 select GENERIC_ALLOCATOR 97 select GENERIC_ALLOCATOR
138 bool 98 bool
139 99
140 config DMA_GLOBAL_POOL !! 100 config DMA_REMAP
141 select DMA_DECLARE_COHERENT <<
142 depends on !ARCH_HAS_DMA_SET_UNCACHED <<
143 depends on !DMA_DIRECT_REMAP <<
144 bool 101 bool
>> 102 depends on MMU
>> 103 select DMA_NONCOHERENT_MMAP
145 104
146 config DMA_DIRECT_REMAP 105 config DMA_DIRECT_REMAP
147 bool 106 bool
>> 107 select DMA_REMAP
148 select DMA_COHERENT_POOL 108 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 <<
159 109
160 config DMA_CMA 110 config DMA_CMA
161 bool "DMA Contiguous Memory Allocator" 111 bool "DMA Contiguous Memory Allocator"
162 depends on HAVE_DMA_CONTIGUOUS && CMA 112 depends on HAVE_DMA_CONTIGUOUS && CMA
163 help 113 help
164 This enables the Contiguous Memory A 114 This enables the Contiguous Memory Allocator which allows drivers
165 to allocate big physically-contiguou 115 to allocate big physically-contiguous blocks of memory for use with
166 hardware components that do not supp 116 hardware components that do not support I/O map nor scatter-gather.
167 117
168 You can disable CMA by specifying "c 118 You can disable CMA by specifying "cma=0" on the kernel's command
169 line. 119 line.
170 120
171 For more information see <kernel/dma 121 For more information see <kernel/dma/contiguous.c>.
172 If unsure, say "n". 122 If unsure, say "n".
173 123
174 if DMA_CMA 124 if DMA_CMA
175 125
176 config DMA_NUMA_CMA !! 126 config DMA_PERNUMA_CMA
177 bool "Enable separate DMA Contiguous M !! 127 bool "Enable separate DMA Contiguous Memory Area for each NUMA Node"
178 depends on NUMA !! 128 default NUMA && ARM64
179 help 129 help
180 Enable this option to get numa CMA a !! 130 Enable this option to get pernuma CMA areas so that devices like
181 can get local memory by DMA coherent !! 131 ARM64 SMMU can get local memory by DMA coherent APIs.
182 132
183 You can set the size of pernuma CMA 133 You can set the size of pernuma CMA by specifying "cma_pernuma=size"
184 or set the node id and its size of C !! 134 on the kernel's command line.
185 <node>:size[,<node>:size]" on the ke <<
186 135
187 comment "Default contiguous memory area size:" 136 comment "Default contiguous memory area size:"
188 137
189 config CMA_SIZE_MBYTES 138 config CMA_SIZE_MBYTES
190 int "Size in Mega Bytes" 139 int "Size in Mega Bytes"
191 depends on !CMA_SIZE_SEL_PERCENTAGE 140 depends on !CMA_SIZE_SEL_PERCENTAGE
192 default 0 if X86 141 default 0 if X86
193 default 16 142 default 16
194 help 143 help
195 Defines the size (in MiB) of the def 144 Defines the size (in MiB) of the default memory area for Contiguous
196 Memory Allocator. If the size of 0 145 Memory Allocator. If the size of 0 is selected, CMA is disabled by
197 default, but it can be enabled by pa 146 default, but it can be enabled by passing cma=size[MG] to the kernel.
198 147
199 148
200 config CMA_SIZE_PERCENTAGE 149 config CMA_SIZE_PERCENTAGE
201 int "Percentage of total memory" 150 int "Percentage of total memory"
202 depends on !CMA_SIZE_SEL_MBYTES 151 depends on !CMA_SIZE_SEL_MBYTES
203 default 0 if X86 152 default 0 if X86
204 default 10 153 default 10
205 help 154 help
206 Defines the size of the default memo 155 Defines the size of the default memory area for Contiguous Memory
207 Allocator as a percentage of the tot 156 Allocator as a percentage of the total memory in the system.
208 If 0 percent is selected, CMA is dis 157 If 0 percent is selected, CMA is disabled by default, but it can be
209 enabled by passing cma=size[MG] to t 158 enabled by passing cma=size[MG] to the kernel.
210 159
211 choice 160 choice
212 prompt "Selected region size" 161 prompt "Selected region size"
213 default CMA_SIZE_SEL_MBYTES 162 default CMA_SIZE_SEL_MBYTES
214 163
215 config CMA_SIZE_SEL_MBYTES 164 config CMA_SIZE_SEL_MBYTES
216 bool "Use mega bytes value only" 165 bool "Use mega bytes value only"
217 166
218 config CMA_SIZE_SEL_PERCENTAGE 167 config CMA_SIZE_SEL_PERCENTAGE
219 bool "Use percentage value only" 168 bool "Use percentage value only"
220 169
221 config CMA_SIZE_SEL_MIN 170 config CMA_SIZE_SEL_MIN
222 bool "Use lower value (minimum)" 171 bool "Use lower value (minimum)"
223 172
224 config CMA_SIZE_SEL_MAX 173 config CMA_SIZE_SEL_MAX
225 bool "Use higher value (maximum)" 174 bool "Use higher value (maximum)"
226 175
227 endchoice 176 endchoice
228 177
229 config CMA_ALIGNMENT 178 config CMA_ALIGNMENT
230 int "Maximum PAGE_SIZE order of alignm 179 int "Maximum PAGE_SIZE order of alignment for contiguous buffers"
231 range 2 12 180 range 2 12
232 default 8 181 default 8
233 help 182 help
234 DMA mapping framework by default ali 183 DMA mapping framework by default aligns all buffers to the smallest
235 PAGE_SIZE order which is greater tha 184 PAGE_SIZE order which is greater than or equal to the requested buffer
236 size. This works well for buffers up 185 size. This works well for buffers up to a few hundreds kilobytes, but
237 for larger buffers it just a memory 186 for larger buffers it just a memory waste. With this parameter you can
238 specify the maximum PAGE_SIZE order 187 specify the maximum PAGE_SIZE order for contiguous buffers. Larger
239 buffers will be aligned only to this 188 buffers will be aligned only to this specified order. The order is
240 expressed as a power of two multipli 189 expressed as a power of two multiplied by the PAGE_SIZE.
241 190
242 For example, if your system defaults 191 For example, if your system defaults to 4KiB pages, the order value
243 of 8 means that the buffers will be 192 of 8 means that the buffers will be aligned up to 1MiB only.
244 193
245 If unsure, leave the default value " 194 If unsure, leave the default value "8".
246 195
247 endif 196 endif
248 197
249 config DMA_API_DEBUG 198 config DMA_API_DEBUG
250 bool "Enable debugging of DMA-API usag 199 bool "Enable debugging of DMA-API usage"
251 select NEED_DMA_MAP_STATE 200 select NEED_DMA_MAP_STATE
252 help 201 help
253 Enable this option to debug the use 202 Enable this option to debug the use of the DMA API by device drivers.
254 With this option you will be able to 203 With this option you will be able to detect common bugs in device
255 drivers like double-freeing of DMA m 204 drivers like double-freeing of DMA mappings or freeing mappings that
256 were never allocated. 205 were never allocated.
257 206
258 This option causes a performance deg 207 This option causes a performance degradation. Use only if you want to
259 debug device drivers and dma interac 208 debug device drivers and dma interactions.
260 209
261 If unsure, say N. 210 If unsure, say N.
262 211
263 config DMA_API_DEBUG_SG 212 config DMA_API_DEBUG_SG
264 bool "Debug DMA scatter-gather usage" 213 bool "Debug DMA scatter-gather usage"
265 default y 214 default y
266 depends on DMA_API_DEBUG 215 depends on DMA_API_DEBUG
267 help 216 help
268 Perform extra checking that callers 217 Perform extra checking that callers of dma_map_sg() have respected the
269 appropriate segment length/boundary 218 appropriate segment length/boundary limits for the given device when
270 preparing DMA scatterlists. 219 preparing DMA scatterlists.
271 220
272 This is particularly likely to have 221 This is particularly likely to have been overlooked in cases where the
273 dma_map_sg() API is used for general 222 dma_map_sg() API is used for general bulk mapping of pages rather than
274 preparing literal scatter-gather des 223 preparing literal scatter-gather descriptors, where there is a risk of
275 unexpected behaviour from DMA API im 224 unexpected behaviour from DMA API implementations if the scatterlist
276 is technically out-of-spec. 225 is technically out-of-spec.
277 226
278 If unsure, say N. 227 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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