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