arch/arm64/Kconfig

   1 config ARM64
   2         def_bool y
   3         select ARCH_BINFMT_ELF_RANDOMIZE_PIE
   4         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
   5         select ARCH_HAS_GCOV_PROFILE_ALL
   6         select ARCH_HAS_SG_CHAIN
   7         select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
   8         select ARCH_USE_CMPXCHG_LOCKREF
   9         select ARCH_SUPPORTS_ATOMIC_RMW
  10         select ARCH_WANT_OPTIONAL_GPIOLIB
  11         select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
  12         select ARCH_WANT_FRAME_POINTERS
  13         select ARM_AMBA
  14         select ARM_ARCH_TIMER
  15         select ARM_GIC
  16         select AUDIT_ARCH_COMPAT_GENERIC
  17         select ARM_GIC_V2M if PCI_MSI
  18         select ARM_GIC_V3
  19         select ARM_GIC_V3_ITS if PCI_MSI
  20         select BUILDTIME_EXTABLE_SORT
  21         select CLONE_BACKWARDS
  22         select COMMON_CLK
  23         select CPU_PM if (SUSPEND || CPU_IDLE)
  24         select DCACHE_WORD_ACCESS
  25         select GENERIC_ALLOCATOR
  26         select GENERIC_CLOCKEVENTS
  27         select GENERIC_CLOCKEVENTS_BROADCAST if SMP
  28         select GENERIC_CPU_AUTOPROBE
  29         select GENERIC_EARLY_IOREMAP
  30         select GENERIC_IRQ_PROBE
  31         select GENERIC_IRQ_SHOW
  32         select GENERIC_PCI_IOMAP
  33         select GENERIC_SCHED_CLOCK
  34         select GENERIC_SMP_IDLE_THREAD
  35         select GENERIC_STRNCPY_FROM_USER
  36         select GENERIC_STRNLEN_USER
  37         select GENERIC_TIME_VSYSCALL
  38         select HANDLE_DOMAIN_IRQ
  39         select HARDIRQS_SW_RESEND
  40         select HAVE_ALIGNED_STRUCT_PAGE if SLUB
  41         select HAVE_ARCH_AUDITSYSCALL
  42         select HAVE_ARCH_JUMP_LABEL
  43         select HAVE_ARCH_KGDB
  44         select HAVE_ARCH_SECCOMP_FILTER
  45         select HAVE_ARCH_TRACEHOOK
  46         select HAVE_BPF_JIT
  47         select HAVE_C_RECORDMCOUNT
  48         select HAVE_CC_STACKPROTECTOR
  49         select HAVE_CMPXCHG_DOUBLE
  50         select HAVE_DEBUG_BUGVERBOSE
  51         select HAVE_DEBUG_KMEMLEAK
  52         select HAVE_DMA_API_DEBUG
  53         select HAVE_DMA_ATTRS
  54         select HAVE_DMA_CONTIGUOUS
  55         select HAVE_DYNAMIC_FTRACE
  56         select HAVE_EFFICIENT_UNALIGNED_ACCESS
  57         select HAVE_FTRACE_MCOUNT_RECORD
  58         select HAVE_FUNCTION_TRACER
  59         select HAVE_FUNCTION_GRAPH_TRACER
  60         select HAVE_GENERIC_DMA_COHERENT
  61         select HAVE_HW_BREAKPOINT if PERF_EVENTS
  62         select HAVE_MEMBLOCK
  63         select HAVE_PATA_PLATFORM
  64         select HAVE_PERF_EVENTS
  65         select HAVE_PERF_REGS
  66         select HAVE_PERF_USER_STACK_DUMP
  67         select HAVE_RCU_TABLE_FREE
  68         select HAVE_SYSCALL_TRACEPOINTS
  69         select IRQ_DOMAIN
  70         select MODULES_USE_ELF_RELA
  71         select NO_BOOTMEM
  72         select OF
  73         select OF_EARLY_FLATTREE
  74         select OF_RESERVED_MEM
  75         select PERF_USE_VMALLOC
  76         select POWER_RESET
  77         select POWER_SUPPLY
  78         select RTC_LIB
  79         select SPARSE_IRQ
  80         select SYSCTL_EXCEPTION_TRACE
  81         select HAVE_CONTEXT_TRACKING
  82         help
  83           ARM 64-bit (AArch64) Linux support.
  84
  85 config 64BIT
  86         def_bool y
  87
  88 config ARCH_PHYS_ADDR_T_64BIT
  89         def_bool y
  90
  91 config MMU
  92         def_bool y
  93
  94 config NO_IOPORT_MAP
  95         def_bool y if !PCI
  96
  97 config STACKTRACE_SUPPORT
  98         def_bool y
  99
 100 config LOCKDEP_SUPPORT
 101         def_bool y
 102
 103 config TRACE_IRQFLAGS_SUPPORT
 104         def_bool y
 105
 106 config RWSEM_XCHGADD_ALGORITHM
 107         def_bool y
 108
 109 config GENERIC_HWEIGHT
 110         def_bool y
 111
 112 config GENERIC_CSUM
 113         def_bool y
 114
 115 config GENERIC_CALIBRATE_DELAY
 116         def_bool y
 117
 118 config ZONE_DMA
 119         def_bool y
 120
 121 config HAVE_GENERIC_RCU_GUP
 122         def_bool y
 123
 124 config ARCH_DMA_ADDR_T_64BIT
 125         def_bool y
 126
 127 config NEED_DMA_MAP_STATE
 128         def_bool y
 129
 130 config NEED_SG_DMA_LENGTH
 131         def_bool y
 132
 133 config SWIOTLB
 134         def_bool y
 135
 136 config IOMMU_HELPER
 137         def_bool SWIOTLB
 138
 139 config KERNEL_MODE_NEON
 140         def_bool y
 141
 142 config FIX_EARLYCON_MEM
 143         def_bool y
 144
 145 source "init/Kconfig"
 146
 147 source "kernel/Kconfig.freezer"
 148
 149 menu "Platform selection"
 150
 151 config ARCH_SEATTLE
 152         bool "AMD Seattle SoC Family"
 153         help
 154           This enables support for AMD Seattle SOC Family
 155
 156 config ARCH_THUNDER
 157         bool "Cavium Inc. Thunder SoC Family"
 158         help
 159           This enables support for Cavium's Thunder Family of SoCs.
 160
 161 config ARCH_VEXPRESS
 162         bool "ARMv8 software model (Versatile Express)"
 163         select ARCH_REQUIRE_GPIOLIB
 164         select COMMON_CLK_VERSATILE
 165         select POWER_RESET_VEXPRESS
 166         select VEXPRESS_CONFIG
 167         help
 168           This enables support for the ARMv8 software model (Versatile
 169           Express).
 170
 171 config ARCH_XGENE
 172         bool "AppliedMicro X-Gene SOC Family"
 173         help
 174           This enables support for AppliedMicro X-Gene SOC Family
 175
 176 endmenu
 177
 178 menu "Bus support"
 179
 180 config PCI
 181         bool "PCI support"
 182         help
 183           This feature enables support for PCI bus system. If you say Y
 184           here, the kernel will include drivers and infrastructure code
 185           to support PCI bus devices.
 186
 187 config PCI_DOMAINS
 188         def_bool PCI
 189
 190 config PCI_DOMAINS_GENERIC
 191         def_bool PCI
 192
 193 config PCI_SYSCALL
 194         def_bool PCI
 195
 196 source "drivers/pci/Kconfig"
 197 source "drivers/pci/pcie/Kconfig"
 198 source "drivers/pci/hotplug/Kconfig"
 199
 200 endmenu
 201
 202 menu "Kernel Features"
 203
 204 menu "ARM errata workarounds via the alternatives framework"
 205
 206 config ARM64_ERRATUM_826319
 207         bool "Cortex-A53: 826319: System might deadlock if a write cannot complete until read data is accepted"
 208         default y
 209         help
 210           This option adds an alternative code sequence to work around ARM
 211           erratum 826319 on Cortex-A53 parts up to r0p2 with an AMBA 4 ACE or
 212           AXI master interface and an L2 cache.
 213
 214           If a Cortex-A53 uses an AMBA AXI4 ACE interface to other processors
 215           and is unable to accept a certain write via this interface, it will
 216           not progress on read data presented on the read data channel and the
 217           system can deadlock.
 218
 219           The workaround promotes data cache clean instructions to
 220           data cache clean-and-invalidate.
 221           Please note that this does not necessarily enable the workaround,
 222           as it depends on the alternative framework, which will only patch
 223           the kernel if an affected CPU is detected.
 224
 225           If unsure, say Y.
 226
 227 config ARM64_ERRATUM_827319
 228         bool "Cortex-A53: 827319: Data cache clean instructions might cause overlapping transactions to the interconnect"
 229         default y
 230         help
 231           This option adds an alternative code sequence to work around ARM
 232           erratum 827319 on Cortex-A53 parts up to r0p2 with an AMBA 5 CHI
 233           master interface and an L2 cache.
 234
 235           Under certain conditions this erratum can cause a clean line eviction
 236           to occur at the same time as another transaction to the same address
 237           on the AMBA 5 CHI interface, which can cause data corruption if the
 238           interconnect reorders the two transactions.
 239
 240           The workaround promotes data cache clean instructions to
 241           data cache clean-and-invalidate.
 242           Please note that this does not necessarily enable the workaround,
 243           as it depends on the alternative framework, which will only patch
 244           the kernel if an affected CPU is detected.
 245
 246           If unsure, say Y.
 247
 248 config ARM64_ERRATUM_824069
 249         bool "Cortex-A53: 824069: Cache line might not be marked as clean after a CleanShared snoop"
 250         default y
 251         help
 252           This option adds an alternative code sequence to work around ARM
 253           erratum 824069 on Cortex-A53 parts up to r0p2 when it is connected
 254           to a coherent interconnect.
 255
 256           If a Cortex-A53 processor is executing a store or prefetch for
 257           write instruction at the same time as a processor in another
 258           cluster is executing a cache maintenance operation to the same
 259           address, then this erratum might cause a clean cache line to be
 260           incorrectly marked as dirty.
 261
 262           The workaround promotes data cache clean instructions to
 263           data cache clean-and-invalidate.
 264           Please note that this option does not necessarily enable the
 265           workaround, as it depends on the alternative framework, which will
 266           only patch the kernel if an affected CPU is detected.
 267
 268           If unsure, say Y.
 269
 270 config ARM64_ERRATUM_819472
 271         bool "Cortex-A53: 819472: Store exclusive instructions might cause data corruption"
 272         default y
 273         help
 274           This option adds an alternative code sequence to work around ARM
 275           erratum 819472 on Cortex-A53 parts up to r0p1 with an L2 cache
 276           present when it is connected to a coherent interconnect.
 277
 278           If the processor is executing a load and store exclusive sequence at
 279           the same time as a processor in another cluster is executing a cache
 280           maintenance operation to the same address, then this erratum might
 281           cause data corruption.
 282
 283           The workaround promotes data cache clean instructions to
 284           data cache clean-and-invalidate.
 285           Please note that this does not necessarily enable the workaround,
 286           as it depends on the alternative framework, which will only patch
 287           the kernel if an affected CPU is detected.
 288
 289           If unsure, say Y.
 290
 291 config ARM64_ERRATUM_832075
 292         bool "Cortex-A57: 832075: possible deadlock on mixing exclusive memory accesses with device loads"
 293         default y
 294         help
 295           This option adds an alternative code sequence to work around ARM
 296           erratum 832075 on Cortex-A57 parts up to r1p2.
 297
 298           Affected Cortex-A57 parts might deadlock when exclusive load/store
 299           instructions to Write-Back memory are mixed with Device loads.
 300
 301           The workaround is to promote device loads to use Load-Acquire
 302           semantics.
 303           Please note that this does not necessarily enable the workaround,
 304           as it depends on the alternative framework, which will only patch
 305           the kernel if an affected CPU is detected.
 306
 307           If unsure, say Y.
 308
 309 endmenu
 310
 311
 312 choice
 313         prompt "Page size"
 314         default ARM64_4K_PAGES
 315         help
 316           Page size (translation granule) configuration.
 317
 318 config ARM64_4K_PAGES
 319         bool "4KB"
 320         help
 321           This feature enables 4KB pages support.
 322
 323 config ARM64_64K_PAGES
 324         bool "64KB"
 325         help
 326           This feature enables 64KB pages support (4KB by default)
 327           allowing only two levels of page tables and faster TLB
 328           look-up. AArch32 emulation is not available when this feature
 329           is enabled.
 330
 331 endchoice
 332
 333 choice
 334         prompt "Virtual address space size"
 335         default ARM64_VA_BITS_39 if ARM64_4K_PAGES
 336         default ARM64_VA_BITS_42 if ARM64_64K_PAGES
 337         help
 338           Allows choosing one of multiple possible virtual address
 339           space sizes. The level of translation table is determined by
 340           a combination of page size and virtual address space size.
 341
 342 config ARM64_VA_BITS_39
 343         bool "39-bit"
 344         depends on ARM64_4K_PAGES
 345
 346 config ARM64_VA_BITS_42
 347         bool "42-bit"
 348         depends on ARM64_64K_PAGES
 349
 350 config ARM64_VA_BITS_48
 351         bool "48-bit"
 352         depends on !ARM_SMMU
 353
 354 endchoice
 355
 356 config ARM64_VA_BITS
 357         int
 358         default 39 if ARM64_VA_BITS_39
 359         default 42 if ARM64_VA_BITS_42
 360         default 48 if ARM64_VA_BITS_48
 361
 362 config ARM64_PGTABLE_LEVELS
 363         int
 364         default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42
 365         default 3 if ARM64_64K_PAGES && ARM64_VA_BITS_48
 366         default 3 if ARM64_4K_PAGES && ARM64_VA_BITS_39
 367         default 4 if ARM64_4K_PAGES && ARM64_VA_BITS_48
 368
 369 config CPU_BIG_ENDIAN
 370        bool "Build big-endian kernel"
 371        help
 372          Say Y if you plan on running a kernel in big-endian mode.
 373
 374 config SMP
 375         bool "Symmetric Multi-Processing"
 376         help
 377           This enables support for systems with more than one CPU.  If
 378           you say N here, the kernel will run on single and
 379           multiprocessor machines, but will use only one CPU of a
 380           multiprocessor machine. If you say Y here, the kernel will run
 381           on many, but not all, single processor machines. On a single
 382           processor machine, the kernel will run faster if you say N
 383           here.
 384
 385           If you don't know what to do here, say N.
 386
 387 config SCHED_MC
 388         bool "Multi-core scheduler support"
 389         depends on SMP
 390         help
 391           Multi-core scheduler support improves the CPU scheduler's decision
 392           making when dealing with multi-core CPU chips at a cost of slightly
 393           increased overhead in some places. If unsure say N here.
 394
 395 config SCHED_SMT
 396         bool "SMT scheduler support"
 397         depends on SMP
 398         help
 399           Improves the CPU scheduler's decision making when dealing with
 400           MultiThreading at a cost of slightly increased overhead in some
 401           places. If unsure say N here.
 402
 403 config NR_CPUS
 404         int "Maximum number of CPUs (2-64)"
 405         range 2 64
 406         depends on SMP
 407         # These have to remain sorted largest to smallest
 408         default "64"
 409
 410 config HOTPLUG_CPU
 411         bool "Support for hot-pluggable CPUs"
 412         depends on SMP
 413         help
 414           Say Y here to experiment with turning CPUs off and on.  CPUs
 415           can be controlled through /sys/devices/system/cpu.
 416
 417 source kernel/Kconfig.preempt
 418
 419 config HZ
 420         int
 421         default 100
 422
 423 config ARCH_HAS_HOLES_MEMORYMODEL
 424         def_bool y if SPARSEMEM
 425
 426 config ARCH_SPARSEMEM_ENABLE
 427         def_bool y
 428         select SPARSEMEM_VMEMMAP_ENABLE
 429
 430 config ARCH_SPARSEMEM_DEFAULT
 431         def_bool ARCH_SPARSEMEM_ENABLE
 432
 433 config ARCH_SELECT_MEMORY_MODEL
 434         def_bool ARCH_SPARSEMEM_ENABLE
 435
 436 config HAVE_ARCH_PFN_VALID
 437         def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
 438
 439 config HW_PERF_EVENTS
 440         bool "Enable hardware performance counter support for perf events"
 441         depends on PERF_EVENTS
 442         default y
 443         help
 444           Enable hardware performance counter support for perf events. If
 445           disabled, perf events will use software events only.
 446
 447 config SYS_SUPPORTS_HUGETLBFS
 448         def_bool y
 449
 450 config ARCH_WANT_GENERAL_HUGETLB
 451         def_bool y
 452
 453 config ARCH_WANT_HUGE_PMD_SHARE
 454         def_bool y if !ARM64_64K_PAGES
 455
 456 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
 457         def_bool y
 458
 459 config ARCH_HAS_CACHE_LINE_SIZE
 460         def_bool y
 461
 462 source "mm/Kconfig"
 463
 464 config SECCOMP
 465         bool "Enable seccomp to safely compute untrusted bytecode"
 466         ---help---
 467           This kernel feature is useful for number crunching applications
 468           that may need to compute untrusted bytecode during their
 469           execution. By using pipes or other transports made available to
 470           the process as file descriptors supporting the read/write
 471           syscalls, it's possible to isolate those applications in
 472           their own address space using seccomp. Once seccomp is
 473           enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
 474           and the task is only allowed to execute a few safe syscalls
 475           defined by each seccomp mode.
 476
 477 config XEN_DOM0
 478         def_bool y
 479         depends on XEN
 480
 481 config XEN
 482         bool "Xen guest support on ARM64"
 483         depends on ARM64 && OF
 484         select SWIOTLB_XEN
 485         help
 486           Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64.
 487
 488 config FORCE_MAX_ZONEORDER
 489         int
 490         default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
 491         default "11"
 492
 493 menuconfig ARMV8_DEPRECATED
 494         bool "Emulate deprecated/obsolete ARMv8 instructions"
 495         depends on COMPAT
 496         help
 497           Legacy software support may require certain instructions
 498           that have been deprecated or obsoleted in the architecture.
 499
 500           Enable this config to enable selective emulation of these
 501           features.
 502
 503           If unsure, say Y
 504
 505 if ARMV8_DEPRECATED
 506
 507 config SWP_EMULATION
 508         bool "Emulate SWP/SWPB instructions"
 509         help
 510           ARMv8 obsoletes the use of A32 SWP/SWPB instructions such that
 511           they are always undefined. Say Y here to enable software
 512           emulation of these instructions for userspace using LDXR/STXR.
 513
 514           In some older versions of glibc [<=2.8] SWP is used during futex
 515           trylock() operations with the assumption that the code will not
 516           be preempted. This invalid assumption may be more likely to fail
 517           with SWP emulation enabled, leading to deadlock of the user
 518           application.
 519
 520           NOTE: when accessing uncached shared regions, LDXR/STXR rely
 521           on an external transaction monitoring block called a global
 522           monitor to maintain update atomicity. If your system does not
 523           implement a global monitor, this option can cause programs that
 524           perform SWP operations to uncached memory to deadlock.
 525
 526           If unsure, say Y
 527
 528 config CP15_BARRIER_EMULATION
 529         bool "Emulate CP15 Barrier instructions"
 530         help
 531           The CP15 barrier instructions - CP15ISB, CP15DSB, and
 532           CP15DMB - are deprecated in ARMv8 (and ARMv7). It is
 533           strongly recommended to use the ISB, DSB, and DMB
 534           instructions instead.
 535
 536           Say Y here to enable software emulation of these
 537           instructions for AArch32 userspace code. When this option is
 538           enabled, CP15 barrier usage is traced which can help
 539           identify software that needs updating.
 540
 541           If unsure, say Y
 542
 543 config SETEND_EMULATION
 544         bool "Emulate SETEND instruction"
 545         help
 546           The SETEND instruction alters the data-endianness of the
 547           AArch32 EL0, and is deprecated in ARMv8.
 548
 549           Say Y here to enable software emulation of the instruction
 550           for AArch32 userspace code.
 551
 552           Note: All the cpus on the system must have mixed endian support at EL0
 553           for this feature to be enabled. If a new CPU - which doesn't support mixed
 554           endian - is hotplugged in after this feature has been enabled, there could
 555           be unexpected results in the applications.
 556
 557           If unsure, say Y
 558 endif
 559
 560 endmenu
 561
 562 menu "Boot options"
 563
 564 config CMDLINE
 565         string "Default kernel command string"
 566         default ""
 567         help
 568           Provide a set of default command-line options at build time by
 569           entering them here. As a minimum, you should specify the the
 570           root device (e.g. root=/dev/nfs).
 571
 572 config CMDLINE_FORCE
 573         bool "Always use the default kernel command string"
 574         help
 575           Always use the default kernel command string, even if the boot
 576           loader passes other arguments to the kernel.
 577           This is useful if you cannot or don't want to change the
 578           command-line options your boot loader passes to the kernel.
 579
 580 config EFI_STUB
 581         bool
 582
 583 config EFI
 584         bool "UEFI runtime support"
 585         depends on OF && !CPU_BIG_ENDIAN
 586         select LIBFDT
 587         select UCS2_STRING
 588         select EFI_PARAMS_FROM_FDT
 589         select EFI_RUNTIME_WRAPPERS
 590         select EFI_STUB
 591         select EFI_ARMSTUB
 592         default y
 593         help
 594           This option provides support for runtime services provided
 595           by UEFI firmware (such as non-volatile variables, realtime
 596           clock, and platform reset). A UEFI stub is also provided to
 597           allow the kernel to be booted as an EFI application. This
 598           is only useful on systems that have UEFI firmware.
 599
 600 config DMI
 601         bool "Enable support for SMBIOS (DMI) tables"
 602         depends on EFI
 603         default y
 604         help
 605           This enables SMBIOS/DMI feature for systems.
 606
 607           This option is only useful on systems that have UEFI firmware.
 608           However, even with this option, the resultant kernel should
 609           continue to boot on existing non-UEFI platforms.
 610
 611 endmenu
 612
 613 menu "Userspace binary formats"
 614
 615 source "fs/Kconfig.binfmt"
 616
 617 config COMPAT
 618         bool "Kernel support for 32-bit EL0"
 619         depends on !ARM64_64K_PAGES
 620         select COMPAT_BINFMT_ELF
 621         select HAVE_UID16
 622         select OLD_SIGSUSPEND3
 623         select COMPAT_OLD_SIGACTION
 624         help
 625           This option enables support for a 32-bit EL0 running under a 64-bit
 626           kernel at EL1. AArch32-specific components such as system calls,
 627           the user helper functions, VFP support and the ptrace interface are
 628           handled appropriately by the kernel.
 629
 630           If you want to execute 32-bit userspace applications, say Y.
 631
 632 config SYSVIPC_COMPAT
 633         def_bool y
 634         depends on COMPAT && SYSVIPC
 635
 636 endmenu
 637
 638 menu "Power management options"
 639
 640 source "kernel/power/Kconfig"
 641
 642 config ARCH_SUSPEND_POSSIBLE
 643         def_bool y
 644
 645 endmenu
 646
 647 menu "CPU Power Management"
 648
 649 source "drivers/cpuidle/Kconfig"
 650
 651 source "drivers/cpufreq/Kconfig"
 652
 653 endmenu
 654
 655 source "net/Kconfig"
 656
 657 source "drivers/Kconfig"
 658
 659 source "drivers/firmware/Kconfig"
 660
 661 source "fs/Kconfig"
 662
 663 source "arch/arm64/kvm/Kconfig"
 664
 665 source "arch/arm64/Kconfig.debug"
 666
 667 source "security/Kconfig"
 668
 669 source "crypto/Kconfig"
 670 if CRYPTO
 671 source "arch/arm64/crypto/Kconfig"
 672 endif
 673
 674 source "lib/Kconfig"