Commit | Line | Data |
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ec8f24b7 | 1 | # SPDX-License-Identifier: GPL-2.0-only |
cf65a0f6 CH |
2 | |
3 | config HAS_DMA | |
4 | bool | |
5 | depends on !NO_DMA | |
6 | default y | |
7 | ||
8 | config NEED_SG_DMA_LENGTH | |
9 | bool | |
10 | ||
11 | config NEED_DMA_MAP_STATE | |
12 | bool | |
13 | ||
14 | config ARCH_DMA_ADDR_T_64BIT | |
15 | def_bool 64BIT || PHYS_ADDR_T_64BIT | |
16 | ||
f3ecc0ff CH |
17 | config ARCH_HAS_DMA_COHERENCE_H |
18 | bool | |
19 | ||
11ddce15 CH |
20 | config ARCH_HAS_DMA_SET_MASK |
21 | bool | |
22 | ||
419e2f18 CH |
23 | # |
24 | # Select this option if the architecture needs special handling for | |
25 | # DMA_ATTR_WRITE_COMBINE. Normally the "uncached" mapping should be what | |
26 | # people thing of when saying write combine, so very few platforms should | |
27 | # need to enable this. | |
28 | # | |
29 | config ARCH_HAS_DMA_WRITE_COMBINE | |
30 | bool | |
31 | ||
ff4c25f2 | 32 | config DMA_DECLARE_COHERENT |
cf65a0f6 CH |
33 | bool |
34 | ||
347cb6af CH |
35 | config ARCH_HAS_SETUP_DMA_OPS |
36 | bool | |
37 | ||
dc2acded | 38 | config ARCH_HAS_TEARDOWN_DMA_OPS |
cf65a0f6 CH |
39 | bool |
40 | ||
41 | config ARCH_HAS_SYNC_DMA_FOR_DEVICE | |
42 | bool | |
43 | ||
44 | config ARCH_HAS_SYNC_DMA_FOR_CPU | |
45 | bool | |
46 | select NEED_DMA_MAP_STATE | |
47 | ||
684f7e91 CH |
48 | config ARCH_HAS_SYNC_DMA_FOR_CPU_ALL |
49 | bool | |
50 | ||
13bf5ced CH |
51 | config ARCH_HAS_DMA_PREP_COHERENT |
52 | bool | |
53 | ||
9087c375 TL |
54 | config ARCH_HAS_FORCE_DMA_UNENCRYPTED |
55 | bool | |
56 | ||
cf65a0f6 CH |
57 | config DMA_NONCOHERENT_CACHE_SYNC |
58 | bool | |
cf65a0f6 CH |
59 | |
60 | config DMA_VIRT_OPS | |
61 | bool | |
62 | depends on HAS_DMA | |
63 | ||
64 | config SWIOTLB | |
65 | bool | |
cf65a0f6 | 66 | select NEED_DMA_MAP_STATE |
f0edfea8 | 67 | |
34dc0ea6 CH |
68 | # |
69 | # Should be selected if we can mmap non-coherent mappings to userspace. | |
70 | # The only thing that is really required is a way to set an uncached bit | |
71 | # in the pagetables | |
72 | # | |
73 | config DMA_NONCOHERENT_MMAP | |
74 | bool | |
75 | ||
f0edfea8 CH |
76 | config DMA_REMAP |
77 | depends on MMU | |
c13edf81 | 78 | select GENERIC_ALLOCATOR |
34dc0ea6 | 79 | select DMA_NONCOHERENT_MMAP |
f0edfea8 | 80 | bool |
0c3b3171 CH |
81 | |
82 | config DMA_DIRECT_REMAP | |
83 | bool | |
0c3b3171 | 84 | select DMA_REMAP |
70ca7ba2 | 85 | |
ddb26d8e CH |
86 | config DMA_CMA |
87 | bool "DMA Contiguous Memory Allocator" | |
88 | depends on HAVE_DMA_CONTIGUOUS && CMA | |
89 | help | |
90 | This enables the Contiguous Memory Allocator which allows drivers | |
91 | to allocate big physically-contiguous blocks of memory for use with | |
92 | hardware components that do not support I/O map nor scatter-gather. | |
93 | ||
94 | You can disable CMA by specifying "cma=0" on the kernel's command | |
95 | line. | |
96 | ||
97 | For more information see <include/linux/dma-contiguous.h>. | |
98 | If unsure, say "n". | |
99 | ||
100 | if DMA_CMA | |
101 | comment "Default contiguous memory area size:" | |
102 | ||
103 | config CMA_SIZE_MBYTES | |
104 | int "Size in Mega Bytes" | |
105 | depends on !CMA_SIZE_SEL_PERCENTAGE | |
106 | default 0 if X86 | |
107 | default 16 | |
108 | help | |
109 | Defines the size (in MiB) of the default memory area for Contiguous | |
110 | Memory Allocator. If the size of 0 is selected, CMA is disabled by | |
111 | default, but it can be enabled by passing cma=size[MG] to the kernel. | |
112 | ||
113 | ||
114 | config CMA_SIZE_PERCENTAGE | |
115 | int "Percentage of total memory" | |
116 | depends on !CMA_SIZE_SEL_MBYTES | |
117 | default 0 if X86 | |
118 | default 10 | |
119 | help | |
120 | Defines the size of the default memory area for Contiguous Memory | |
121 | Allocator as a percentage of the total memory in the system. | |
122 | If 0 percent is selected, CMA is disabled by default, but it can be | |
123 | enabled by passing cma=size[MG] to the kernel. | |
124 | ||
125 | choice | |
126 | prompt "Selected region size" | |
127 | default CMA_SIZE_SEL_MBYTES | |
128 | ||
129 | config CMA_SIZE_SEL_MBYTES | |
130 | bool "Use mega bytes value only" | |
131 | ||
132 | config CMA_SIZE_SEL_PERCENTAGE | |
133 | bool "Use percentage value only" | |
134 | ||
135 | config CMA_SIZE_SEL_MIN | |
136 | bool "Use lower value (minimum)" | |
137 | ||
138 | config CMA_SIZE_SEL_MAX | |
139 | bool "Use higher value (maximum)" | |
140 | ||
141 | endchoice | |
142 | ||
143 | config CMA_ALIGNMENT | |
144 | int "Maximum PAGE_SIZE order of alignment for contiguous buffers" | |
145 | range 4 12 | |
146 | default 8 | |
147 | help | |
148 | DMA mapping framework by default aligns all buffers to the smallest | |
149 | PAGE_SIZE order which is greater than or equal to the requested buffer | |
150 | size. This works well for buffers up to a few hundreds kilobytes, but | |
151 | for larger buffers it just a memory waste. With this parameter you can | |
152 | specify the maximum PAGE_SIZE order for contiguous buffers. Larger | |
153 | buffers will be aligned only to this specified order. The order is | |
154 | expressed as a power of two multiplied by the PAGE_SIZE. | |
155 | ||
156 | For example, if your system defaults to 4KiB pages, the order value | |
157 | of 8 means that the buffers will be aligned up to 1MiB only. | |
158 | ||
159 | If unsure, leave the default value "8". | |
160 | ||
161 | endif | |
162 | ||
70ca7ba2 AS |
163 | config DMA_API_DEBUG |
164 | bool "Enable debugging of DMA-API usage" | |
165 | select NEED_DMA_MAP_STATE | |
166 | help | |
167 | Enable this option to debug the use of the DMA API by device drivers. | |
168 | With this option you will be able to detect common bugs in device | |
169 | drivers like double-freeing of DMA mappings or freeing mappings that | |
170 | were never allocated. | |
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 | ||
177 | This option causes a performance degradation. Use only if you want to | |
178 | debug device drivers and dma interactions. | |
179 | ||
180 | If unsure, say N. | |
181 | ||
182 | config DMA_API_DEBUG_SG | |
183 | bool "Debug DMA scatter-gather usage" | |
184 | default y | |
185 | depends on DMA_API_DEBUG | |
186 | help | |
187 | Perform extra checking that callers of dma_map_sg() have respected the | |
188 | appropriate segment length/boundary limits for the given device when | |
189 | preparing DMA scatterlists. | |
190 | ||
191 | This is particularly likely to have been overlooked in cases where the | |
192 | dma_map_sg() API is used for general bulk mapping of pages rather than | |
193 | preparing literal scatter-gather descriptors, where there is a risk of | |
194 | unexpected behaviour from DMA API implementations if the scatterlist | |
195 | is technically out-of-spec. | |
196 | ||
197 | If unsure, say N. |