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_BITREVERSE
  43         select HAVE_ARCH_JUMP_LABEL
  44         select HAVE_ARCH_KGDB
  45         select HAVE_ARCH_SECCOMP_FILTER
  46         select HAVE_ARCH_TRACEHOOK
  47         select HAVE_BPF_JIT
  48         select HAVE_C_RECORDMCOUNT
  49         select HAVE_CC_STACKPROTECTOR
  50         select HAVE_CMPXCHG_DOUBLE
  51         select HAVE_DEBUG_BUGVERBOSE
  52         select HAVE_DEBUG_KMEMLEAK
  53         select HAVE_DMA_API_DEBUG
  54         select HAVE_DMA_ATTRS
  55         select HAVE_DMA_CONTIGUOUS
  56         select HAVE_DYNAMIC_FTRACE
  57         select HAVE_EFFICIENT_UNALIGNED_ACCESS
  58         select HAVE_FTRACE_MCOUNT_RECORD
  59         select HAVE_FUNCTION_TRACER
  60         select HAVE_FUNCTION_GRAPH_TRACER
  61         select HAVE_GENERIC_DMA_COHERENT
  62         select HAVE_HW_BREAKPOINT if PERF_EVENTS
  63         select HAVE_MEMBLOCK
  64         select HAVE_PATA_PLATFORM
  65         select HAVE_PERF_EVENTS
  66         select HAVE_PERF_REGS
  67         select HAVE_PERF_USER_STACK_DUMP
  68         select HAVE_RCU_TABLE_FREE
  69         select HAVE_SYSCALL_TRACEPOINTS
  70         select IRQ_DOMAIN
  71         select MODULES_USE_ELF_RELA
  72         select NO_BOOTMEM
  73         select OF
  74         select OF_EARLY_FLATTREE
  75         select OF_RESERVED_MEM
  76         select PERF_USE_VMALLOC
  77         select POWER_RESET
  78         select POWER_SUPPLY
  79         select RTC_LIB
  80         select SPARSE_IRQ
  81         select SYSCTL_EXCEPTION_TRACE
  82         select HAVE_CONTEXT_TRACKING
  83         help
  84           ARM 64-bit (AArch64) Linux support.
  85
  86 config 64BIT
  87         def_bool y
  88
  89 config ARCH_PHYS_ADDR_T_64BIT
  90         def_bool y
  91
  92 config MMU
  93         def_bool y
  94
  95 config NO_IOPORT_MAP
  96         def_bool y if !PCI
  97
  98 config STACKTRACE_SUPPORT
  99         def_bool y
 100
 101 config LOCKDEP_SUPPORT
 102         def_bool y
 103
 104 config TRACE_IRQFLAGS_SUPPORT
 105         def_bool y
 106
 107 config RWSEM_XCHGADD_ALGORITHM
 108         def_bool y
 109
 110 config GENERIC_HWEIGHT
 111         def_bool y
 112
 113 config GENERIC_CSUM
 114         def_bool y
 115
 116 config GENERIC_CALIBRATE_DELAY
 117         def_bool y
 118
 119 config ZONE_DMA
 120         def_bool y
 121
 122 config HAVE_GENERIC_RCU_GUP
 123         def_bool y
 124
 125 config ARCH_DMA_ADDR_T_64BIT
 126         def_bool y
 127
 128 config NEED_DMA_MAP_STATE
 129         def_bool y
 130
 131 config NEED_SG_DMA_LENGTH
 132         def_bool y
 133
 134 config SWIOTLB
 135         def_bool y
 136
 137 config IOMMU_HELPER
 138         def_bool SWIOTLB
 139
 140 config KERNEL_MODE_NEON
 141         def_bool y
 142
 143 config FIX_EARLYCON_MEM
 144         def_bool y
 145
 146 source "init/Kconfig"
 147
 148 source "kernel/Kconfig.freezer"
 149
 150 menu "Platform selection"
 151
 152 config ARCH_SEATTLE
 153         bool "AMD Seattle SoC Family"
 154         help
 155           This enables support for AMD Seattle SOC Family
 156
 157 config ARCH_THUNDER
 158         bool "Cavium Inc. Thunder SoC Family"
 159         help
 160           This enables support for Cavium's Thunder Family of SoCs.
 161
 162 config ARCH_VEXPRESS
 163         bool "ARMv8 software model (Versatile Express)"
 164         select ARCH_REQUIRE_GPIOLIB
 165         select COMMON_CLK_VERSATILE
 166         select POWER_RESET_VEXPRESS
 167         select VEXPRESS_CONFIG
 168         help
 169           This enables support for the ARMv8 software model (Versatile
 170           Express).
 171
 172 config ARCH_XGENE
 173         bool "AppliedMicro X-Gene SOC Family"
 174         help
 175           This enables support for AppliedMicro X-Gene SOC Family
 176
 177 endmenu
 178
 179 menu "Bus support"
 180
 181 config PCI
 182         bool "PCI support"
 183         help
 184           This feature enables support for PCI bus system. If you say Y
 185           here, the kernel will include drivers and infrastructure code
 186           to support PCI bus devices.
 187
 188 config PCI_DOMAINS
 189         def_bool PCI
 190
 191 config PCI_DOMAINS_GENERIC
 192         def_bool PCI
 193
 194 config PCI_SYSCALL
 195         def_bool PCI
 196
 197 source "drivers/pci/Kconfig"
 198 source "drivers/pci/pcie/Kconfig"
 199 source "drivers/pci/hotplug/Kconfig"
 200
 201 endmenu
 202
 203 menu "Kernel Features"
 204
 205 menu "ARM errata workarounds via the alternatives framework"
 206
 207 config ARM64_ERRATUM_826319
 208         bool "Cortex-A53: 826319: System might deadlock if a write cannot complete until read data is accepted"
 209         default y
 210         help
 211           This option adds an alternative code sequence to work around ARM
 212           erratum 826319 on Cortex-A53 parts up to r0p2 with an AMBA 4 ACE or
 213           AXI master interface and an L2 cache.
 214
 215           If a Cortex-A53 uses an AMBA AXI4 ACE interface to other processors
 216           and is unable to accept a certain write via this interface, it will
 217           not progress on read data presented on the read data channel and the
 218           system can deadlock.
 219
 220           The workaround promotes data cache clean instructions to
 221           data cache clean-and-invalidate.
 222           Please note that this does not necessarily enable the workaround,
 223           as it depends on the alternative framework, which will only patch
 224           the kernel if an affected CPU is detected.
 225
 226           If unsure, say Y.
 227
 228 config ARM64_ERRATUM_827319
 229         bool "Cortex-A53: 827319: Data cache clean instructions might cause overlapping transactions to the interconnect"
 230         default y
 231         help
 232           This option adds an alternative code sequence to work around ARM
 233           erratum 827319 on Cortex-A53 parts up to r0p2 with an AMBA 5 CHI
 234           master interface and an L2 cache.
 235
 236           Under certain conditions this erratum can cause a clean line eviction
 237           to occur at the same time as another transaction to the same address
 238           on the AMBA 5 CHI interface, which can cause data corruption if the
 239           interconnect reorders the two transactions.
 240
 241           The workaround promotes data cache clean instructions to
 242           data cache clean-and-invalidate.
 243           Please note that this does not necessarily enable the workaround,
 244           as it depends on the alternative framework, which will only patch
 245           the kernel if an affected CPU is detected.
 246
 247           If unsure, say Y.
 248
 249 config ARM64_ERRATUM_824069
 250         bool "Cortex-A53: 824069: Cache line might not be marked as clean after a CleanShared snoop"
 251         default y
 252         help
 253           This option adds an alternative code sequence to work around ARM
 254           erratum 824069 on Cortex-A53 parts up to r0p2 when it is connected
 255           to a coherent interconnect.
 256
 257           If a Cortex-A53 processor is executing a store or prefetch for
 258           write instruction at the same time as a processor in another
 259           cluster is executing a cache maintenance operation to the same
 260           address, then this erratum might cause a clean cache line to be
 261           incorrectly marked as dirty.
 262
 263           The workaround promotes data cache clean instructions to
 264           data cache clean-and-invalidate.
 265           Please note that this option does not necessarily enable the
 266           workaround, as it depends on the alternative framework, which will
 267           only patch the kernel if an affected CPU is detected.
 268
 269           If unsure, say Y.
 270
 271 config ARM64_ERRATUM_819472
 272         bool "Cortex-A53: 819472: Store exclusive instructions might cause data corruption"
 273         default y
 274         help
 275           This option adds an alternative code sequence to work around ARM
 276           erratum 819472 on Cortex-A53 parts up to r0p1 with an L2 cache
 277           present when it is connected to a coherent interconnect.
 278
 279           If the processor is executing a load and store exclusive sequence at
 280           the same time as a processor in another cluster is executing a cache
 281           maintenance operation to the same address, then this erratum might
 282           cause data corruption.
 283
 284           The workaround promotes data cache clean instructions to
 285           data cache clean-and-invalidate.
 286           Please note that this does not necessarily enable the workaround,
 287           as it depends on the alternative framework, which will only patch
 288           the kernel if an affected CPU is detected.
 289
 290           If unsure, say Y.
 291
 292 config ARM64_ERRATUM_832075
 293         bool "Cortex-A57: 832075: possible deadlock on mixing exclusive memory accesses with device loads"
 294         default y
 295         help
 296           This option adds an alternative code sequence to work around ARM
 297           erratum 832075 on Cortex-A57 parts up to r1p2.
 298
 299           Affected Cortex-A57 parts might deadlock when exclusive load/store
 300           instructions to Write-Back memory are mixed with Device loads.
 301
 302           The workaround is to promote device loads to use Load-Acquire
 303           semantics.
 304           Please note that this does not necessarily enable the workaround,
 305           as it depends on the alternative framework, which will only patch
 306           the kernel if an affected CPU is detected.
 307
 308           If unsure, say Y.
 309
 310 endmenu
 311
 312
 313 choice
 314         prompt "Page size"
 315         default ARM64_4K_PAGES
 316         help
 317           Page size (translation granule) configuration.
 318
 319 config ARM64_4K_PAGES
 320         bool "4KB"
 321         help
 322           This feature enables 4KB pages support.
 323
 324 config ARM64_64K_PAGES
 325         bool "64KB"
 326         help
 327           This feature enables 64KB pages support (4KB by default)
 328           allowing only two levels of page tables and faster TLB
 329           look-up. AArch32 emulation is not available when this feature
 330           is enabled.
 331
 332 endchoice
 333
 334 choice
 335         prompt "Virtual address space size"
 336         default ARM64_VA_BITS_39 if ARM64_4K_PAGES
 337         default ARM64_VA_BITS_42 if ARM64_64K_PAGES
 338         help
 339           Allows choosing one of multiple possible virtual address
 340           space sizes. The level of translation table is determined by
 341           a combination of page size and virtual address space size.
 342
 343 config ARM64_VA_BITS_39
 344         bool "39-bit"
 345         depends on ARM64_4K_PAGES
 346
 347 config ARM64_VA_BITS_42
 348         bool "42-bit"
 349         depends on ARM64_64K_PAGES
 350
 351 config ARM64_VA_BITS_48
 352         bool "48-bit"
 353         depends on !ARM_SMMU
 354
 355 endchoice
 356
 357 config ARM64_VA_BITS
 358         int
 359         default 39 if ARM64_VA_BITS_39
 360         default 42 if ARM64_VA_BITS_42
 361         default 48 if ARM64_VA_BITS_48
 362
 363 config ARM64_PGTABLE_LEVELS
 364         int
 365         default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42
 366         default 3 if ARM64_64K_PAGES && ARM64_VA_BITS_48
 367         default 3 if ARM64_4K_PAGES && ARM64_VA_BITS_39
 368         default 4 if ARM64_4K_PAGES && ARM64_VA_BITS_48
 369
 370 config CPU_BIG_ENDIAN
 371        bool "Build big-endian kernel"
 372        help
 373          Say Y if you plan on running a kernel in big-endian mode.
 374
 375 config SMP
 376         bool "Symmetric Multi-Processing"
 377         help
 378           This enables support for systems with more than one CPU.  If
 379           you say N here, the kernel will run on single and
 380           multiprocessor machines, but will use only one CPU of a
 381           multiprocessor machine. If you say Y here, the kernel will run
 382           on many, but not all, single processor machines. On a single
 383           processor machine, the kernel will run faster if you say N
 384           here.
 385
 386           If you don't know what to do here, say N.
 387
 388 config SCHED_MC
 389         bool "Multi-core scheduler support"
 390         depends on SMP
 391         help
 392           Multi-core scheduler support improves the CPU scheduler's decision
 393           making when dealing with multi-core CPU chips at a cost of slightly
 394           increased overhead in some places. If unsure say N here.
 395
 396 config SCHED_SMT
 397         bool "SMT scheduler support"
 398         depends on SMP
 399         help
 400           Improves the CPU scheduler's decision making when dealing with
 401           MultiThreading at a cost of slightly increased overhead in some
 402           places. If unsure say N here.
 403
 404 config NR_CPUS
 405         int "Maximum number of CPUs (2-64)"
 406         range 2 64
 407         depends on SMP
 408         # These have to remain sorted largest to smallest
 409         default "64"
 410
 411 config HOTPLUG_CPU
 412         bool "Support for hot-pluggable CPUs"
 413         depends on SMP
 414         help
 415           Say Y here to experiment with turning CPUs off and on.  CPUs
 416           can be controlled through /sys/devices/system/cpu.
 417
 418 source kernel/Kconfig.preempt
 419
 420 config HZ
 421         int
 422         default 100
 423
 424 config ARCH_HAS_HOLES_MEMORYMODEL
 425         def_bool y if SPARSEMEM
 426
 427 config ARCH_SPARSEMEM_ENABLE
 428         def_bool y
 429         select SPARSEMEM_VMEMMAP_ENABLE
 430
 431 config ARCH_SPARSEMEM_DEFAULT
 432         def_bool ARCH_SPARSEMEM_ENABLE
 433
 434 config ARCH_SELECT_MEMORY_MODEL
 435         def_bool ARCH_SPARSEMEM_ENABLE
 436
 437 config HAVE_ARCH_PFN_VALID
 438         def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
 439
 440 config HW_PERF_EVENTS
 441         bool "Enable hardware performance counter support for perf events"
 442         depends on PERF_EVENTS
 443         default y
 444         help
 445           Enable hardware performance counter support for perf events. If
 446           disabled, perf events will use software events only.
 447
 448 config SYS_SUPPORTS_HUGETLBFS
 449         def_bool y
 450
 451 config ARCH_WANT_GENERAL_HUGETLB
 452         def_bool y
 453
 454 config ARCH_WANT_HUGE_PMD_SHARE
 455         def_bool y if !ARM64_64K_PAGES
 456
 457 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
 458         def_bool y
 459
 460 config ARCH_HAS_CACHE_LINE_SIZE
 461         def_bool y
 462
 463 source "mm/Kconfig"
 464
 465 config SECCOMP
 466         bool "Enable seccomp to safely compute untrusted bytecode"
 467         ---help---
 468           This kernel feature is useful for number crunching applications
 469           that may need to compute untrusted bytecode during their
 470           execution. By using pipes or other transports made available to
 471           the process as file descriptors supporting the read/write
 472           syscalls, it's possible to isolate those applications in
 473           their own address space using seccomp. Once seccomp is
 474           enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
 475           and the task is only allowed to execute a few safe syscalls
 476           defined by each seccomp mode.
 477
 478 config XEN_DOM0
 479         def_bool y
 480         depends on XEN
 481
 482 config XEN
 483         bool "Xen guest support on ARM64"
 484         depends on ARM64 && OF
 485         select SWIOTLB_XEN
 486         help
 487           Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64.
 488
 489 config FORCE_MAX_ZONEORDER
 490         int
 491         default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
 492         default "11"
 493
 494 menuconfig ARMV8_DEPRECATED
 495         bool "Emulate deprecated/obsolete ARMv8 instructions"
 496         depends on COMPAT
 497         help
 498           Legacy software support may require certain instructions
 499           that have been deprecated or obsoleted in the architecture.
 500
 501           Enable this config to enable selective emulation of these
 502           features.
 503
 504           If unsure, say Y
 505
 506 if ARMV8_DEPRECATED
 507
 508 config SWP_EMULATION
 509         bool "Emulate SWP/SWPB instructions"
 510         help
 511           ARMv8 obsoletes the use of A32 SWP/SWPB instructions such that
 512           they are always undefined. Say Y here to enable software
 513           emulation of these instructions for userspace using LDXR/STXR.
 514
 515           In some older versions of glibc [<=2.8] SWP is used during futex
 516           trylock() operations with the assumption that the code will not
 517           be preempted. This invalid assumption may be more likely to fail
 518           with SWP emulation enabled, leading to deadlock of the user
 519           application.
 520
 521           NOTE: when accessing uncached shared regions, LDXR/STXR rely
 522           on an external transaction monitoring block called a global
 523           monitor to maintain update atomicity. If your system does not
 524           implement a global monitor, this option can cause programs that
 525           perform SWP operations to uncached memory to deadlock.
 526
 527           If unsure, say Y
 528
 529 config CP15_BARRIER_EMULATION
 530         bool "Emulate CP15 Barrier instructions"
 531         help
 532           The CP15 barrier instructions - CP15ISB, CP15DSB, and
 533           CP15DMB - are deprecated in ARMv8 (and ARMv7). It is
 534           strongly recommended to use the ISB, DSB, and DMB
 535           instructions instead.
 536
 537           Say Y here to enable software emulation of these
 538           instructions for AArch32 userspace code. When this option is
 539           enabled, CP15 barrier usage is traced which can help
 540           identify software that needs updating.
 541
 542           If unsure, say Y
 543
 544 endif
 545
 546 endmenu
 547
 548 menu "Boot options"
 549
 550 config CMDLINE
 551         string "Default kernel command string"
 552         default ""
 553         help
 554           Provide a set of default command-line options at build time by
 555           entering them here. As a minimum, you should specify the the
 556           root device (e.g. root=/dev/nfs).
 557
 558 config CMDLINE_FORCE
 559         bool "Always use the default kernel command string"
 560         help
 561           Always use the default kernel command string, even if the boot
 562           loader passes other arguments to the kernel.
 563           This is useful if you cannot or don't want to change the
 564           command-line options your boot loader passes to the kernel.
 565
 566 config EFI_STUB
 567         bool
 568
 569 config EFI
 570         bool "UEFI runtime support"
 571         depends on OF && !CPU_BIG_ENDIAN
 572         select LIBFDT
 573         select UCS2_STRING
 574         select EFI_PARAMS_FROM_FDT
 575         select EFI_RUNTIME_WRAPPERS
 576         select EFI_STUB
 577         select EFI_ARMSTUB
 578         default y
 579         help
 580           This option provides support for runtime services provided
 581           by UEFI firmware (such as non-volatile variables, realtime
 582           clock, and platform reset). A UEFI stub is also provided to
 583           allow the kernel to be booted as an EFI application. This
 584           is only useful on systems that have UEFI firmware.
 585
 586 config DMI
 587         bool "Enable support for SMBIOS (DMI) tables"
 588         depends on EFI
 589         default y
 590         help
 591           This enables SMBIOS/DMI feature for systems.
 592
 593           This option is only useful on systems that have UEFI firmware.
 594           However, even with this option, the resultant kernel should
 595           continue to boot on existing non-UEFI platforms.
 596
 597 endmenu
 598
 599 menu "Userspace binary formats"
 600
 601 source "fs/Kconfig.binfmt"
 602
 603 config COMPAT
 604         bool "Kernel support for 32-bit EL0"
 605         depends on !ARM64_64K_PAGES
 606         select COMPAT_BINFMT_ELF
 607         select HAVE_UID16
 608         select OLD_SIGSUSPEND3
 609         select COMPAT_OLD_SIGACTION
 610         help
 611           This option enables support for a 32-bit EL0 running under a 64-bit
 612           kernel at EL1. AArch32-specific components such as system calls,
 613           the user helper functions, VFP support and the ptrace interface are
 614           handled appropriately by the kernel.
 615
 616           If you want to execute 32-bit userspace applications, say Y.
 617
 618 config SYSVIPC_COMPAT
 619         def_bool y
 620         depends on COMPAT && SYSVIPC
 621
 622 endmenu
 623
 624 menu "Power management options"
 625
 626 source "kernel/power/Kconfig"
 627
 628 config ARCH_SUSPEND_POSSIBLE
 629         def_bool y
 630
 631 config ARM64_CPU_SUSPEND
 632         def_bool PM_SLEEP
 633
 634 endmenu
 635
 636 menu "CPU Power Management"
 637
 638 source "drivers/cpuidle/Kconfig"
 639
 640 source "drivers/cpufreq/Kconfig"
 641
 642 endmenu
 643
 644 source "net/Kconfig"
 645
 646 source "drivers/Kconfig"
 647
 648 source "drivers/firmware/Kconfig"
 649
 650 source "fs/Kconfig"
 651
 652 source "arch/arm64/kvm/Kconfig"
 653
 654 source "arch/arm64/Kconfig.debug"
 655
 656 source "security/Kconfig"
 657
 658 source "crypto/Kconfig"
 659 if CRYPTO
 660 source "arch/arm64/crypto/Kconfig"
 661 endif
 662
 663 source "lib/Kconfig"