tjh.dev / kernel
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kernel / arch / tile / Kconfig
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1# For a description of the syntax of this configuration file, 2# see Documentation/kbuild/kconfig-language.txt. 3 4config TILE 5 def_bool y 6 select HAVE_PERF_EVENTS 7 select USE_PMC if PERF_EVENTS 8 select HAVE_DMA_API_DEBUG 9 select HAVE_KVM if !TILEGX 10 select GENERIC_FIND_FIRST_BIT 11 select SYSCTL_EXCEPTION_TRACE 12 select CC_OPTIMIZE_FOR_SIZE 13 select HAVE_DEBUG_KMEMLEAK 14 select GENERIC_IRQ_PROBE 15 select GENERIC_PENDING_IRQ if SMP 16 select GENERIC_IRQ_SHOW 17 select HAVE_DEBUG_BUGVERBOSE 18 select VIRT_TO_BUS 19 select SYS_HYPERVISOR 20 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS 21 select ARCH_HAS_DEVMEM_IS_ALLOWED 22 select ARCH_HAVE_NMI_SAFE_CMPXCHG 23 select GENERIC_CLOCKEVENTS 24 select MODULES_USE_ELF_RELA 25 select HAVE_ARCH_TRACEHOOK 26 select HAVE_SYSCALL_TRACEPOINTS 27 select USER_STACKTRACE_SUPPORT 28 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE 29 select HAVE_DEBUG_STACKOVERFLOW 30 select ARCH_WANT_FRAME_POINTERS 31 select HAVE_CONTEXT_TRACKING 32 select EDAC_SUPPORT 33 select GENERIC_STRNCPY_FROM_USER 34 select GENERIC_STRNLEN_USER 35 select HAVE_ARCH_SECCOMP_FILTER 36 37# FIXME: investigate whether we need/want these options. 38# select HAVE_IOREMAP_PROT 39# select HAVE_OPTPROBES 40# select HAVE_REGS_AND_STACK_ACCESS_API 41# select HAVE_HW_BREAKPOINT 42# select PERF_EVENTS 43# select HAVE_USER_RETURN_NOTIFIER 44# config NO_BOOTMEM 45# config ARCH_SUPPORTS_DEBUG_PAGEALLOC 46# config HUGETLB_PAGE_SIZE_VARIABLE 47 48config MMU 49 def_bool y 50 51config GENERIC_CSUM 52 def_bool y 53 54config HAVE_ARCH_ALLOC_REMAP 55 def_bool y 56 57config HAVE_SETUP_PER_CPU_AREA 58 def_bool y 59 60config NEED_PER_CPU_PAGE_FIRST_CHUNK 61 def_bool y 62 63config SYS_SUPPORTS_HUGETLBFS 64 def_bool y 65 66# Support for additional huge page sizes besides HPAGE_SIZE. 67# The software support is currently only present in the TILE-Gx 68# hypervisor. TILEPro in any case does not support page sizes 69# larger than the default HPAGE_SIZE. 70config HUGETLB_SUPER_PAGES 71 depends on HUGETLB_PAGE && TILEGX 72 def_bool y 73 74config GENERIC_TIME_VSYSCALL 75 def_bool y 76 77# Enable PMC if PERF_EVENTS, OPROFILE, or WATCHPOINTS are enabled. 78config USE_PMC 79 bool 80 81# FIXME: tilegx can implement a more efficient rwsem. 82config RWSEM_GENERIC_SPINLOCK 83 def_bool y 84 85# We only support gcc 4.4 and above, so this should work. 86config ARCH_SUPPORTS_OPTIMIZED_INLINING 87 def_bool y 88 89config ARCH_PHYS_ADDR_T_64BIT 90 def_bool y 91 92config ARCH_DMA_ADDR_T_64BIT 93 def_bool y 94 95config NEED_DMA_MAP_STATE 96 def_bool y 97 98config ARCH_HAS_DMA_SET_COHERENT_MASK 99 bool 100 101config LOCKDEP_SUPPORT 102 def_bool y 103 104config STACKTRACE_SUPPORT 105 def_bool y 106 select STACKTRACE 107 108# We use discontigmem for now; at some point we may want to switch 109# to sparsemem (Tilera bug 7996). 110config ARCH_DISCONTIGMEM_ENABLE 111 def_bool y 112 113config ARCH_DISCONTIGMEM_DEFAULT 114 def_bool y 115 116config TRACE_IRQFLAGS_SUPPORT 117 def_bool y 118 119# SMP is required for Tilera Linux. 120config SMP 121 def_bool y 122 123config HVC_TILE 124 depends on TTY 125 select HVC_DRIVER 126 select HVC_IRQ if TILEGX 127 def_bool y 128 129# Building with ARCH=tilegx (or ARCH=tile) implies using the 130# 64-bit TILE-Gx toolchain, so force CONFIG_TILEGX on. 131config TILEGX 132 def_bool ARCH != "tilepro" 133 select SPARSE_IRQ 134 select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ 135 select HAVE_FUNCTION_TRACER 136 select HAVE_FUNCTION_GRAPH_TRACER 137 select HAVE_DYNAMIC_FTRACE 138 select HAVE_FTRACE_MCOUNT_RECORD 139 select HAVE_KPROBES 140 select HAVE_KRETPROBES 141 select HAVE_ARCH_KGDB 142 select ARCH_SUPPORTS_ATOMIC_RMW 143 select HAVE_ARCH_JUMP_LABEL 144 145config TILEPRO 146 def_bool !TILEGX 147 148config 64BIT 149 def_bool TILEGX 150 151config ARCH_DEFCONFIG 152 string 153 default "arch/tile/configs/tilepro_defconfig" if !TILEGX 154 default "arch/tile/configs/tilegx_defconfig" if TILEGX 155 156config PGTABLE_LEVELS 157 int 158 default 3 if 64BIT 159 default 2 160 161source "init/Kconfig" 162 163source "kernel/Kconfig.freezer" 164 165menu "Tilera-specific configuration" 166 167config NR_CPUS 168 int "Maximum number of tiles (2-255)" 169 range 2 255 170 depends on SMP 171 default "64" 172 ---help--- 173 Building with 64 is the recommended value, but a slightly 174 smaller kernel memory footprint results from using a smaller 175 value on chips with fewer tiles. 176 177choice 178 prompt "Kernel page size" 179 default PAGE_SIZE_64KB 180 help 181 This lets you select the page size of the kernel. For best 182 performance on memory-intensive applications, a page size of 64KB 183 is recommended. For workloads involving many small files, many 184 connections, etc., it may be better to select 16KB, which uses 185 memory more efficiently at some cost in TLB performance. 186 187 Note that for TILEPro, you must also rebuild the hypervisor 188 with a matching page size. 189 190config PAGE_SIZE_4KB 191 bool "4KB" if TILEPRO 192 193config PAGE_SIZE_16KB 194 bool "16KB" 195 196config PAGE_SIZE_64KB 197 bool "64KB" 198 199endchoice 200 201source "kernel/Kconfig.hz" 202 203config KEXEC 204 bool "kexec system call" 205 select KEXEC_CORE 206 ---help--- 207 kexec is a system call that implements the ability to shutdown your 208 current kernel, and to start another kernel. It is like a reboot 209 but it is independent of the system firmware. It is used 210 to implement the "mboot" Tilera booter. 211 212 The name comes from the similarity to the exec system call. 213 214config COMPAT 215 bool "Support 32-bit TILE-Gx binaries in addition to 64-bit" 216 depends on TILEGX 217 select COMPAT_BINFMT_ELF 218 default y 219 ---help--- 220 If enabled, the kernel will support running TILE-Gx binaries 221 that were built with the -m32 option. 222 223config SECCOMP 224 bool "Enable seccomp to safely compute untrusted bytecode" 225 depends on PROC_FS 226 help 227 This kernel feature is useful for number crunching applications 228 that may need to compute untrusted bytecode during their 229 execution. By using pipes or other transports made available to 230 the process as file descriptors supporting the read/write 231 syscalls, it's possible to isolate those applications in 232 their own address space using seccomp. Once seccomp is 233 enabled via prctl, it cannot be disabled and the task is only 234 allowed to execute a few safe syscalls defined by each seccomp 235 mode. 236 237 If unsure, say N. 238 239config SYSVIPC_COMPAT 240 def_bool y 241 depends on COMPAT && SYSVIPC 242 243# We do not currently support disabling HIGHMEM on tilepro. 244config HIGHMEM 245 bool # "Support for more than 512 MB of RAM" 246 default !TILEGX 247 ---help--- 248 Linux can use the full amount of RAM in the system by 249 default. However, the address space of TILE processors is 250 only 4 Gigabytes large. That means that, if you have a large 251 amount of physical memory, not all of it can be "permanently 252 mapped" by the kernel. The physical memory that's not 253 permanently mapped is called "high memory". 254 255 If you are compiling a kernel which will never run on a 256 machine with more than 512 MB total physical RAM, answer 257 "false" here. This will result in the kernel mapping all of 258 physical memory into the top 1 GB of virtual memory space. 259 260 If unsure, say "true". 261 262config ZONE_DMA 263 def_bool y 264 265config IOMMU_HELPER 266 bool 267 268config NEED_SG_DMA_LENGTH 269 bool 270 271config SWIOTLB 272 bool 273 default TILEGX 274 select IOMMU_HELPER 275 select NEED_SG_DMA_LENGTH 276 select ARCH_HAS_DMA_SET_COHERENT_MASK 277 278# We do not currently support disabling NUMA. 279config NUMA 280 bool # "NUMA Memory Allocation and Scheduler Support" 281 depends on SMP && DISCONTIGMEM 282 default y 283 ---help--- 284 NUMA memory allocation is required for TILE processors 285 unless booting with memory striping enabled in the 286 hypervisor, or with only a single memory controller. 287 It is recommended that this option always be enabled. 288 289config NODES_SHIFT 290 int "Log base 2 of the max number of memory controllers" 291 default 2 292 depends on NEED_MULTIPLE_NODES 293 ---help--- 294 By default, 2, i.e. 2^2 == 4 DDR2 controllers. 295 In a system with more controllers, this value should be raised. 296 297choice 298 depends on !TILEGX 299 prompt "Memory split" if EXPERT 300 default VMSPLIT_3G 301 ---help--- 302 Select the desired split between kernel and user memory. 303 304 If the address range available to the kernel is less than the 305 physical memory installed, the remaining memory will be available 306 as "high memory". Accessing high memory is a little more costly 307 than low memory, as it needs to be mapped into the kernel first. 308 Note that increasing the kernel address space limits the range 309 available to user programs, making the address space there 310 tighter. Selecting anything other than the default 3G/1G split 311 will also likely make your kernel incompatible with binary-only 312 kernel modules. 313 314 If you are not absolutely sure what you are doing, leave this 315 option alone! 316 317 config VMSPLIT_3_75G 318 bool "3.75G/0.25G user/kernel split (no kernel networking)" 319 config VMSPLIT_3_5G 320 bool "3.5G/0.5G user/kernel split" 321 config VMSPLIT_3G 322 bool "3G/1G user/kernel split" 323 config VMSPLIT_2_75G 324 bool "2.75G/1.25G user/kernel split (for full 1G low memory)" 325 config VMSPLIT_2_5G 326 bool "2.5G/1.5G user/kernel split" 327 config VMSPLIT_2_25G 328 bool "2.25G/1.75G user/kernel split" 329 config VMSPLIT_2G 330 bool "2G/2G user/kernel split" 331 config VMSPLIT_1G 332 bool "1G/3G user/kernel split" 333endchoice 334 335config PAGE_OFFSET 336 hex 337 depends on !64BIT 338 default 0xF0000000 if VMSPLIT_3_75G 339 default 0xE0000000 if VMSPLIT_3_5G 340 default 0xB0000000 if VMSPLIT_2_75G 341 default 0xA0000000 if VMSPLIT_2_5G 342 default 0x90000000 if VMSPLIT_2_25G 343 default 0x80000000 if VMSPLIT_2G 344 default 0x40000000 if VMSPLIT_1G 345 default 0xC0000000 346 347source "mm/Kconfig" 348 349source "kernel/Kconfig.preempt" 350 351config CMDLINE_BOOL 352 bool "Built-in kernel command line" 353 default n 354 ---help--- 355 Allow for specifying boot arguments to the kernel at 356 build time. On some systems (e.g. embedded ones), it is 357 necessary or convenient to provide some or all of the 358 kernel boot arguments with the kernel itself (that is, 359 to not rely on the boot loader to provide them.) 360 361 To compile command line arguments into the kernel, 362 set this option to 'Y', then fill in the 363 the boot arguments in CONFIG_CMDLINE. 364 365 Systems with fully functional boot loaders (e.g. mboot, or 366 if booting over PCI) should leave this option set to 'N'. 367 368config CMDLINE 369 string "Built-in kernel command string" 370 depends on CMDLINE_BOOL 371 default "" 372 ---help--- 373 Enter arguments here that should be compiled into the kernel 374 image and used at boot time. If the boot loader provides a 375 command line at boot time, it is appended to this string to 376 form the full kernel command line, when the system boots. 377 378 However, you can use the CONFIG_CMDLINE_OVERRIDE option to 379 change this behavior. 380 381 In most cases, the command line (whether built-in or provided 382 by the boot loader) should specify the device for the root 383 file system. 384 385config CMDLINE_OVERRIDE 386 bool "Built-in command line overrides boot loader arguments" 387 default n 388 depends on CMDLINE_BOOL 389 ---help--- 390 Set this option to 'Y' to have the kernel ignore the boot loader 391 command line, and use ONLY the built-in command line. 392 393 This is used to work around broken boot loaders. This should 394 be set to 'N' under normal conditions. 395 396config VMALLOC_RESERVE 397 hex 398 default 0x2000000 399 400config HARDWALL 401 bool "Hardwall support to allow access to user dynamic network" 402 default y 403 404config KERNEL_PL 405 int "Processor protection level for kernel" 406 range 1 2 407 default 2 if TILEGX 408 default 1 if !TILEGX 409 ---help--- 410 Since MDE 4.2, the Tilera hypervisor runs the kernel 411 at PL2 by default. If running under an older hypervisor, 412 or as a KVM guest, you must run at PL1. (The current 413 hypervisor may also be recompiled with "make HV_PL=2" to 414 allow it to run a kernel at PL1, but clients running at PL1 415 are not expected to be supported indefinitely.) 416 417 If you're not sure, don't change the default. 418 419source "arch/tile/gxio/Kconfig" 420 421endmenu # Tilera-specific configuration 422 423menu "Bus options" 424 425config PCI 426 bool "PCI support" 427 default y 428 select PCI_DOMAINS 429 select GENERIC_PCI_IOMAP 430 select TILE_GXIO_TRIO if TILEGX 431 select PCI_MSI if TILEGX 432 ---help--- 433 Enable PCI root complex support, so PCIe endpoint devices can 434 be attached to the Tile chip. Many, but not all, PCI devices 435 are supported under Tilera's root complex driver. 436 437config PCI_DOMAINS 438 bool 439 440config NO_IOMEM 441 def_bool !PCI 442 443config NO_IOPORT_MAP 444 def_bool !PCI 445 446config TILE_PCI_IO 447 bool "PCI I/O space support" 448 default n 449 depends on PCI 450 depends on TILEGX 451 ---help--- 452 Enable PCI I/O space support on TILEGx. Since the PCI I/O space 453 is used by few modern PCIe endpoint devices, its support is disabled 454 by default to save the TRIO PIO Region resource for other purposes. 455 456source "drivers/pci/Kconfig" 457 458source "drivers/pci/pcie/Kconfig" 459 460config TILE_USB 461 tristate "Tilera USB host adapter support" 462 default y 463 depends on USB 464 depends on TILEGX 465 select TILE_GXIO_USB_HOST 466 ---help--- 467 Provides USB host adapter support for the built-in EHCI and OHCI 468 interfaces on TILE-Gx chips. 469 470source "drivers/pci/hotplug/Kconfig" 471 472endmenu 473 474menu "Executable file formats" 475 476source "fs/Kconfig.binfmt" 477 478endmenu 479 480source "net/Kconfig" 481 482source "drivers/Kconfig" 483 484source "fs/Kconfig" 485 486source "arch/tile/Kconfig.debug" 487 488source "security/Kconfig" 489 490source "crypto/Kconfig" 491 492source "lib/Kconfig" 493 494source "arch/tile/kvm/Kconfig"