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 # Lets platform IOMMU driver choose between bypass and IOMMU 23 config ARCH_HAS_DMA_MAP_DIRECT 24 config ARCH_HAS_DMA_MAP_DIRECT 24 bool 25 bool 25 26 26 config NEED_SG_DMA_FLAGS 27 config NEED_SG_DMA_FLAGS 27 bool 28 bool 28 29 29 config NEED_SG_DMA_LENGTH 30 config NEED_SG_DMA_LENGTH 30 bool 31 bool 31 32 32 config NEED_DMA_MAP_STATE 33 config NEED_DMA_MAP_STATE 33 bool 34 bool 34 35 35 config ARCH_DMA_ADDR_T_64BIT 36 config ARCH_DMA_ADDR_T_64BIT 36 def_bool 64BIT || PHYS_ADDR_T_64BIT 37 def_bool 64BIT || PHYS_ADDR_T_64BIT 37 38 38 config ARCH_HAS_DMA_SET_MASK 39 config ARCH_HAS_DMA_SET_MASK 39 bool 40 bool 40 41 41 # 42 # 42 # Select this option if the architecture needs 43 # Select this option if the architecture needs special handling for 43 # DMA_ATTR_WRITE_COMBINE. Normally the "uncac 44 # DMA_ATTR_WRITE_COMBINE. Normally the "uncached" mapping should be what 44 # people think of when saying write combine, s 45 # people think of when saying write combine, so very few platforms should 45 # need to enable this. 46 # need to enable this. 46 # 47 # 47 config ARCH_HAS_DMA_WRITE_COMBINE 48 config ARCH_HAS_DMA_WRITE_COMBINE 48 bool 49 bool 49 50 50 # 51 # 51 # Select if the architectures provides the arc 52 # Select if the architectures provides the arch_dma_mark_clean hook 52 # 53 # 53 config ARCH_HAS_DMA_MARK_CLEAN 54 config ARCH_HAS_DMA_MARK_CLEAN 54 bool 55 bool 55 56 56 config DMA_DECLARE_COHERENT 57 config DMA_DECLARE_COHERENT 57 bool 58 bool 58 59 59 config ARCH_HAS_SETUP_DMA_OPS 60 config ARCH_HAS_SETUP_DMA_OPS 60 bool 61 bool 61 62 62 config ARCH_HAS_TEARDOWN_DMA_OPS 63 config ARCH_HAS_TEARDOWN_DMA_OPS 63 bool 64 bool 64 65 65 config ARCH_HAS_SYNC_DMA_FOR_DEVICE 66 config ARCH_HAS_SYNC_DMA_FOR_DEVICE 66 bool 67 bool 67 68 68 config ARCH_HAS_SYNC_DMA_FOR_CPU 69 config ARCH_HAS_SYNC_DMA_FOR_CPU 69 bool 70 bool 70 select NEED_DMA_MAP_STATE 71 select NEED_DMA_MAP_STATE 71 72 72 config ARCH_HAS_SYNC_DMA_FOR_CPU_ALL 73 config ARCH_HAS_SYNC_DMA_FOR_CPU_ALL 73 bool 74 bool 74 75 75 config ARCH_HAS_DMA_PREP_COHERENT 76 config ARCH_HAS_DMA_PREP_COHERENT 76 bool 77 bool 77 78 78 config ARCH_HAS_FORCE_DMA_UNENCRYPTED 79 config ARCH_HAS_FORCE_DMA_UNENCRYPTED 79 bool 80 bool 80 81 81 # 82 # 82 # Select this option if the architecture assum 83 # Select this option if the architecture assumes DMA devices are coherent 83 # by default. 84 # by default. 84 # 85 # 85 config ARCH_DMA_DEFAULT_COHERENT 86 config ARCH_DMA_DEFAULT_COHERENT 86 bool 87 bool 87 88 88 config SWIOTLB 89 config SWIOTLB 89 bool 90 bool 90 select NEED_DMA_MAP_STATE 91 select NEED_DMA_MAP_STATE 91 92 92 config SWIOTLB_DYNAMIC 93 config SWIOTLB_DYNAMIC 93 bool "Dynamic allocation of DMA bounce 94 bool "Dynamic allocation of DMA bounce buffers" 94 default n 95 default n 95 depends on SWIOTLB 96 depends on SWIOTLB 96 help 97 help 97 This enables dynamic resizing of the 98 This enables dynamic resizing of the software IO TLB. The kernel 98 starts with one memory pool at boot 99 starts with one memory pool at boot and it will allocate additional 99 pools as needed. To reduce run-time 100 pools as needed. To reduce run-time kernel memory requirements, you 100 may have to specify a smaller size o 101 may have to specify a smaller size of the initial pool using 101 "swiotlb=" on the kernel command lin 102 "swiotlb=" on the kernel command line. 102 103 103 If unsure, say N. 104 If unsure, say N. 104 105 105 config DMA_BOUNCE_UNALIGNED_KMALLOC 106 config DMA_BOUNCE_UNALIGNED_KMALLOC 106 bool 107 bool 107 depends on SWIOTLB 108 depends on SWIOTLB 108 109 109 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 110 config DMA_RESTRICTED_POOL 115 bool "DMA Restricted Pool" 111 bool "DMA Restricted Pool" 116 depends on OF && OF_RESERVED_MEM && SW 112 depends on OF && OF_RESERVED_MEM && SWIOTLB 117 help 113 help 118 This enables support for restricted 114 This enables support for restricted DMA pools which provide a level of 119 DMA memory protection on systems wit 115 DMA memory protection on systems with limited hardware protection 120 capabilities, such as those lacking 116 capabilities, such as those lacking an IOMMU. 121 117 122 For more information see 118 For more information see 123 <Documentation/devicetree/bindings/r 119 <Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt> 124 and <kernel/dma/swiotlb.c>. 120 and <kernel/dma/swiotlb.c>. 125 If unsure, say "n". 121 If unsure, say "n". 126 122 127 # 123 # 128 # Should be selected if we can mmap non-cohere 124 # Should be selected if we can mmap non-coherent mappings to userspace. 129 # The only thing that is really required is a 125 # The only thing that is really required is a way to set an uncached bit 130 # in the pagetables 126 # in the pagetables 131 # 127 # 132 config DMA_NONCOHERENT_MMAP 128 config DMA_NONCOHERENT_MMAP 133 default y if !MMU 129 default y if !MMU 134 bool 130 bool 135 131 136 config DMA_COHERENT_POOL 132 config DMA_COHERENT_POOL 137 select GENERIC_ALLOCATOR 133 select GENERIC_ALLOCATOR 138 bool 134 bool 139 135 140 config DMA_GLOBAL_POOL 136 config DMA_GLOBAL_POOL 141 select DMA_DECLARE_COHERENT 137 select DMA_DECLARE_COHERENT 142 depends on !ARCH_HAS_DMA_SET_UNCACHED << 143 depends on !DMA_DIRECT_REMAP << 144 bool 138 bool 145 139 146 config DMA_DIRECT_REMAP 140 config DMA_DIRECT_REMAP 147 bool 141 bool 148 select DMA_COHERENT_POOL 142 select DMA_COHERENT_POOL 149 select DMA_NONCOHERENT_MMAP 143 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 << 159 144 160 config DMA_CMA 145 config DMA_CMA 161 bool "DMA Contiguous Memory Allocator" 146 bool "DMA Contiguous Memory Allocator" 162 depends on HAVE_DMA_CONTIGUOUS && CMA 147 depends on HAVE_DMA_CONTIGUOUS && CMA 163 help 148 help 164 This enables the Contiguous Memory A 149 This enables the Contiguous Memory Allocator which allows drivers 165 to allocate big physically-contiguou 150 to allocate big physically-contiguous blocks of memory for use with 166 hardware components that do not supp 151 hardware components that do not support I/O map nor scatter-gather. 167 152 168 You can disable CMA by specifying "c 153 You can disable CMA by specifying "cma=0" on the kernel's command 169 line. 154 line. 170 155 171 For more information see <kernel/dma 156 For more information see <kernel/dma/contiguous.c>. 172 If unsure, say "n". 157 If unsure, say "n". 173 158 174 if DMA_CMA 159 if DMA_CMA 175 160 176 config DMA_NUMA_CMA 161 config DMA_NUMA_CMA 177 bool "Enable separate DMA Contiguous M 162 bool "Enable separate DMA Contiguous Memory Area for NUMA Node" 178 depends on NUMA 163 depends on NUMA 179 help 164 help 180 Enable this option to get numa CMA a 165 Enable this option to get numa CMA areas so that NUMA devices 181 can get local memory by DMA coherent 166 can get local memory by DMA coherent APIs. 182 167 183 You can set the size of pernuma CMA 168 You can set the size of pernuma CMA by specifying "cma_pernuma=size" 184 or set the node id and its size of C 169 or set the node id and its size of CMA by specifying "numa_cma= 185 <node>:size[,<node>:size]" on the ke 170 <node>:size[,<node>:size]" on the kernel's command line. 186 171 187 comment "Default contiguous memory area size:" 172 comment "Default contiguous memory area size:" 188 173 189 config CMA_SIZE_MBYTES 174 config CMA_SIZE_MBYTES 190 int "Size in Mega Bytes" 175 int "Size in Mega Bytes" 191 depends on !CMA_SIZE_SEL_PERCENTAGE 176 depends on !CMA_SIZE_SEL_PERCENTAGE 192 default 0 if X86 177 default 0 if X86 193 default 16 178 default 16 194 help 179 help 195 Defines the size (in MiB) of the def 180 Defines the size (in MiB) of the default memory area for Contiguous 196 Memory Allocator. If the size of 0 181 Memory Allocator. If the size of 0 is selected, CMA is disabled by 197 default, but it can be enabled by pa 182 default, but it can be enabled by passing cma=size[MG] to the kernel. 198 183 199 184 200 config CMA_SIZE_PERCENTAGE 185 config CMA_SIZE_PERCENTAGE 201 int "Percentage of total memory" 186 int "Percentage of total memory" 202 depends on !CMA_SIZE_SEL_MBYTES 187 depends on !CMA_SIZE_SEL_MBYTES 203 default 0 if X86 188 default 0 if X86 204 default 10 189 default 10 205 help 190 help 206 Defines the size of the default memo 191 Defines the size of the default memory area for Contiguous Memory 207 Allocator as a percentage of the tot 192 Allocator as a percentage of the total memory in the system. 208 If 0 percent is selected, CMA is dis 193 If 0 percent is selected, CMA is disabled by default, but it can be 209 enabled by passing cma=size[MG] to t 194 enabled by passing cma=size[MG] to the kernel. 210 195 211 choice 196 choice 212 prompt "Selected region size" 197 prompt "Selected region size" 213 default CMA_SIZE_SEL_MBYTES 198 default CMA_SIZE_SEL_MBYTES 214 199 215 config CMA_SIZE_SEL_MBYTES 200 config CMA_SIZE_SEL_MBYTES 216 bool "Use mega bytes value only" 201 bool "Use mega bytes value only" 217 202 218 config CMA_SIZE_SEL_PERCENTAGE 203 config CMA_SIZE_SEL_PERCENTAGE 219 bool "Use percentage value only" 204 bool "Use percentage value only" 220 205 221 config CMA_SIZE_SEL_MIN 206 config CMA_SIZE_SEL_MIN 222 bool "Use lower value (minimum)" 207 bool "Use lower value (minimum)" 223 208 224 config CMA_SIZE_SEL_MAX 209 config CMA_SIZE_SEL_MAX 225 bool "Use higher value (maximum)" 210 bool "Use higher value (maximum)" 226 211 227 endchoice 212 endchoice 228 213 229 config CMA_ALIGNMENT 214 config CMA_ALIGNMENT 230 int "Maximum PAGE_SIZE order of alignm 215 int "Maximum PAGE_SIZE order of alignment for contiguous buffers" 231 range 2 12 216 range 2 12 232 default 8 217 default 8 233 help 218 help 234 DMA mapping framework by default ali 219 DMA mapping framework by default aligns all buffers to the smallest 235 PAGE_SIZE order which is greater tha 220 PAGE_SIZE order which is greater than or equal to the requested buffer 236 size. This works well for buffers up 221 size. This works well for buffers up to a few hundreds kilobytes, but 237 for larger buffers it just a memory 222 for larger buffers it just a memory waste. With this parameter you can 238 specify the maximum PAGE_SIZE order 223 specify the maximum PAGE_SIZE order for contiguous buffers. Larger 239 buffers will be aligned only to this 224 buffers will be aligned only to this specified order. The order is 240 expressed as a power of two multipli 225 expressed as a power of two multiplied by the PAGE_SIZE. 241 226 242 For example, if your system defaults 227 For example, if your system defaults to 4KiB pages, the order value 243 of 8 means that the buffers will be 228 of 8 means that the buffers will be aligned up to 1MiB only. 244 229 245 If unsure, leave the default value " 230 If unsure, leave the default value "8". 246 231 247 endif 232 endif 248 233 249 config DMA_API_DEBUG 234 config DMA_API_DEBUG 250 bool "Enable debugging of DMA-API usag 235 bool "Enable debugging of DMA-API usage" 251 select NEED_DMA_MAP_STATE 236 select NEED_DMA_MAP_STATE 252 help 237 help 253 Enable this option to debug the use 238 Enable this option to debug the use of the DMA API by device drivers. 254 With this option you will be able to 239 With this option you will be able to detect common bugs in device 255 drivers like double-freeing of DMA m 240 drivers like double-freeing of DMA mappings or freeing mappings that 256 were never allocated. 241 were never allocated. 257 242 258 This option causes a performance deg 243 This option causes a performance degradation. Use only if you want to 259 debug device drivers and dma interac 244 debug device drivers and dma interactions. 260 245 261 If unsure, say N. 246 If unsure, say N. 262 247 263 config DMA_API_DEBUG_SG 248 config DMA_API_DEBUG_SG 264 bool "Debug DMA scatter-gather usage" 249 bool "Debug DMA scatter-gather usage" 265 default y 250 default y 266 depends on DMA_API_DEBUG 251 depends on DMA_API_DEBUG 267 help 252 help 268 Perform extra checking that callers 253 Perform extra checking that callers of dma_map_sg() have respected the 269 appropriate segment length/boundary 254 appropriate segment length/boundary limits for the given device when 270 preparing DMA scatterlists. 255 preparing DMA scatterlists. 271 256 272 This is particularly likely to have 257 This is particularly likely to have been overlooked in cases where the 273 dma_map_sg() API is used for general 258 dma_map_sg() API is used for general bulk mapping of pages rather than 274 preparing literal scatter-gather des 259 preparing literal scatter-gather descriptors, where there is a risk of 275 unexpected behaviour from DMA API im 260 unexpected behaviour from DMA API implementations if the scatterlist 276 is technically out-of-spec. 261 is technically out-of-spec. 277 262 278 If unsure, say N. 263 If unsure, say N. 279 264 280 config DMA_MAP_BENCHMARK 265 config DMA_MAP_BENCHMARK 281 bool "Enable benchmarking of streaming 266 bool "Enable benchmarking of streaming DMA mapping" 282 depends on DEBUG_FS 267 depends on DEBUG_FS 283 help 268 help 284 Provides /sys/kernel/debug/dma_map_b 269 Provides /sys/kernel/debug/dma_map_benchmark that helps with testing 285 performance of dma_(un)map_page. 270 performance of dma_(un)map_page. 286 271 287 See tools/testing/selftests/dma/dma_ 272 See tools/testing/selftests/dma/dma_map_benchmark.c
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