linux/arch/s390/Kconfig
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   1config MMU
   2        def_bool y
   3
   4config ZONE_DMA
   5        def_bool y
   6
   7config LOCKDEP_SUPPORT
   8        def_bool y
   9
  10config STACKTRACE_SUPPORT
  11        def_bool y
  12
  13config HAVE_LATENCYTOP_SUPPORT
  14        def_bool y
  15
  16config RWSEM_GENERIC_SPINLOCK
  17        bool
  18
  19config RWSEM_XCHGADD_ALGORITHM
  20        def_bool y
  21
  22config ARCH_HAS_ILOG2_U32
  23        def_bool n
  24
  25config ARCH_HAS_ILOG2_U64
  26        def_bool n
  27
  28config GENERIC_HWEIGHT
  29        def_bool y
  30
  31config GENERIC_BUG
  32        def_bool y if BUG
  33
  34config GENERIC_BUG_RELATIVE_POINTERS
  35        def_bool y
  36
  37config NO_IOMEM
  38        def_bool y
  39
  40config NO_DMA
  41        def_bool y
  42
  43config ARCH_DMA_ADDR_T_64BIT
  44        def_bool 64BIT
  45
  46config GENERIC_LOCKBREAK
  47        def_bool y if SMP && PREEMPT
  48
  49config PGSTE
  50        def_bool y if KVM
  51
  52config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  53        def_bool y
  54
  55config KEXEC
  56        def_bool y
  57
  58config AUDIT_ARCH
  59        def_bool y
  60
  61config S390
  62        def_bool y
  63        select USE_GENERIC_SMP_HELPERS if SMP
  64        select GENERIC_CPU_DEVICES if !SMP
  65        select HAVE_SYSCALL_WRAPPERS
  66        select HAVE_FUNCTION_TRACER
  67        select HAVE_FUNCTION_TRACE_MCOUNT_TEST
  68        select HAVE_FTRACE_MCOUNT_RECORD
  69        select HAVE_C_RECORDMCOUNT
  70        select HAVE_SYSCALL_TRACEPOINTS
  71        select SYSCTL_EXCEPTION_TRACE
  72        select HAVE_DYNAMIC_FTRACE
  73        select HAVE_FUNCTION_GRAPH_TRACER
  74        select HAVE_REGS_AND_STACK_ACCESS_API
  75        select HAVE_OPROFILE
  76        select HAVE_KPROBES
  77        select HAVE_KRETPROBES
  78        select HAVE_KVM if 64BIT
  79        select HAVE_ARCH_TRACEHOOK
  80        select INIT_ALL_POSSIBLE
  81        select HAVE_IRQ_WORK
  82        select HAVE_PERF_EVENTS
  83        select ARCH_HAVE_NMI_SAFE_CMPXCHG
  84        select HAVE_DEBUG_KMEMLEAK
  85        select HAVE_KERNEL_GZIP
  86        select HAVE_KERNEL_BZIP2
  87        select HAVE_KERNEL_LZMA
  88        select HAVE_KERNEL_LZO
  89        select HAVE_KERNEL_XZ
  90        select HAVE_ARCH_MUTEX_CPU_RELAX
  91        select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
  92        select HAVE_BPF_JIT if 64BIT && PACK_STACK
  93        select ARCH_SAVE_PAGE_KEYS if HIBERNATION
  94        select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  95        select HAVE_MEMBLOCK
  96        select HAVE_MEMBLOCK_NODE_MAP
  97        select HAVE_CMPXCHG_LOCAL
  98        select HAVE_CMPXCHG_DOUBLE
  99        select HAVE_ALIGNED_STRUCT_PAGE if SLUB
 100        select HAVE_VIRT_CPU_ACCOUNTING
 101        select VIRT_CPU_ACCOUNTING
 102        select ARCH_DISCARD_MEMBLOCK
 103        select BUILDTIME_EXTABLE_SORT
 104        select ARCH_INLINE_SPIN_TRYLOCK
 105        select ARCH_INLINE_SPIN_TRYLOCK_BH
 106        select ARCH_INLINE_SPIN_LOCK
 107        select ARCH_INLINE_SPIN_LOCK_BH
 108        select ARCH_INLINE_SPIN_LOCK_IRQ
 109        select ARCH_INLINE_SPIN_LOCK_IRQSAVE
 110        select ARCH_INLINE_SPIN_UNLOCK
 111        select ARCH_INLINE_SPIN_UNLOCK_BH
 112        select ARCH_INLINE_SPIN_UNLOCK_IRQ
 113        select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
 114        select ARCH_INLINE_READ_TRYLOCK
 115        select ARCH_INLINE_READ_LOCK
 116        select ARCH_INLINE_READ_LOCK_BH
 117        select ARCH_INLINE_READ_LOCK_IRQ
 118        select ARCH_INLINE_READ_LOCK_IRQSAVE
 119        select ARCH_INLINE_READ_UNLOCK
 120        select ARCH_INLINE_READ_UNLOCK_BH
 121        select ARCH_INLINE_READ_UNLOCK_IRQ
 122        select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
 123        select ARCH_INLINE_WRITE_TRYLOCK
 124        select ARCH_INLINE_WRITE_LOCK
 125        select ARCH_INLINE_WRITE_LOCK_BH
 126        select ARCH_INLINE_WRITE_LOCK_IRQ
 127        select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 128        select ARCH_INLINE_WRITE_UNLOCK
 129        select ARCH_INLINE_WRITE_UNLOCK_BH
 130        select ARCH_INLINE_WRITE_UNLOCK_IRQ
 131        select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 132        select HAVE_UID16 if 32BIT
 133        select ARCH_WANT_IPC_PARSE_VERSION
 134        select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
 135        select GENERIC_SMP_IDLE_THREAD
 136        select GENERIC_TIME_VSYSCALL_OLD
 137        select GENERIC_CLOCKEVENTS
 138        select KTIME_SCALAR if 32BIT
 139        select HAVE_ARCH_SECCOMP_FILTER
 140        select GENERIC_KERNEL_THREAD
 141        select HAVE_MOD_ARCH_SPECIFIC
 142        select MODULES_USE_ELF_RELA
 143
 144config SCHED_OMIT_FRAME_POINTER
 145        def_bool y
 146
 147source "init/Kconfig"
 148
 149source "kernel/Kconfig.freezer"
 150
 151menu "Processor type and features"
 152
 153config HAVE_MARCH_Z900_FEATURES
 154        def_bool n
 155
 156config HAVE_MARCH_Z990_FEATURES
 157        def_bool n
 158        select HAVE_MARCH_Z900_FEATURES
 159
 160config HAVE_MARCH_Z9_109_FEATURES
 161        def_bool n
 162        select HAVE_MARCH_Z990_FEATURES
 163
 164config HAVE_MARCH_Z10_FEATURES
 165        def_bool n
 166        select HAVE_MARCH_Z9_109_FEATURES
 167
 168config HAVE_MARCH_Z196_FEATURES
 169        def_bool n
 170        select HAVE_MARCH_Z10_FEATURES
 171
 172choice
 173        prompt "Processor type"
 174        default MARCH_G5
 175
 176config MARCH_G5
 177        bool "System/390 model G5 and G6"
 178        depends on !64BIT
 179        help
 180          Select this to build a 31 bit kernel that works
 181          on all ESA/390 and z/Architecture machines.
 182
 183config MARCH_Z900
 184        bool "IBM zSeries model z800 and z900"
 185        select HAVE_MARCH_Z900_FEATURES if 64BIT
 186        help
 187          Select this to enable optimizations for model z800/z900 (2064 and
 188          2066 series). This will enable some optimizations that are not
 189          available on older ESA/390 (31 Bit) only CPUs.
 190
 191config MARCH_Z990
 192        bool "IBM zSeries model z890 and z990"
 193        select HAVE_MARCH_Z990_FEATURES if 64BIT
 194        help
 195          Select this to enable optimizations for model z890/z990 (2084 and
 196          2086 series). The kernel will be slightly faster but will not work
 197          on older machines.
 198
 199config MARCH_Z9_109
 200        bool "IBM System z9"
 201        select HAVE_MARCH_Z9_109_FEATURES if 64BIT
 202        help
 203          Select this to enable optimizations for IBM System z9 (2094 and
 204          2096 series). The kernel will be slightly faster but will not work
 205          on older machines.
 206
 207config MARCH_Z10
 208        bool "IBM System z10"
 209        select HAVE_MARCH_Z10_FEATURES if 64BIT
 210        help
 211          Select this to enable optimizations for IBM System z10 (2097 and
 212          2098 series). The kernel will be slightly faster but will not work
 213          on older machines.
 214
 215config MARCH_Z196
 216        bool "IBM zEnterprise 114 and 196"
 217        select HAVE_MARCH_Z196_FEATURES if 64BIT
 218        help
 219          Select this to enable optimizations for IBM zEnterprise 114 and 196
 220          (2818 and 2817 series). The kernel will be slightly faster but will
 221          not work on older machines.
 222
 223endchoice
 224
 225config 64BIT
 226        def_bool y
 227        prompt "64 bit kernel"
 228        help
 229          Select this option if you have an IBM z/Architecture machine
 230          and want to use the 64 bit addressing mode.
 231
 232config 32BIT
 233        def_bool y if !64BIT
 234
 235config COMPAT
 236        def_bool y
 237        prompt "Kernel support for 31 bit emulation"
 238        depends on 64BIT
 239        select COMPAT_BINFMT_ELF if BINFMT_ELF
 240        select ARCH_WANT_OLD_COMPAT_IPC
 241        help
 242          Select this option if you want to enable your system kernel to
 243          handle system-calls from ELF binaries for 31 bit ESA.  This option
 244          (and some other stuff like libraries and such) is needed for
 245          executing 31 bit applications.  It is safe to say "Y".
 246
 247config SYSVIPC_COMPAT
 248        def_bool y if COMPAT && SYSVIPC
 249
 250config KEYS_COMPAT
 251        def_bool y if COMPAT && KEYS
 252
 253config SMP
 254        def_bool y
 255        prompt "Symmetric multi-processing support"
 256        ---help---
 257          This enables support for systems with more than one CPU. If you have
 258          a system with only one CPU, like most personal computers, say N. If
 259          you have a system with more than one CPU, say Y.
 260
 261          If you say N here, the kernel will run on single and multiprocessor
 262          machines, but will use only one CPU of a multiprocessor machine. If
 263          you say Y here, the kernel will run on many, but not all,
 264          singleprocessor machines. On a singleprocessor machine, the kernel
 265          will run faster if you say N here.
 266
 267          See also the SMP-HOWTO available at
 268          <http://www.tldp.org/docs.html#howto>.
 269
 270          Even if you don't know what to do here, say Y.
 271
 272config NR_CPUS
 273        int "Maximum number of CPUs (2-64)"
 274        range 2 64
 275        depends on SMP
 276        default "32" if !64BIT
 277        default "64" if 64BIT
 278        help
 279          This allows you to specify the maximum number of CPUs which this
 280          kernel will support.  The maximum supported value is 64 and the
 281          minimum value which makes sense is 2.
 282
 283          This is purely to save memory - each supported CPU adds
 284          approximately sixteen kilobytes to the kernel image.
 285
 286config HOTPLUG_CPU
 287        def_bool y
 288        prompt "Support for hot-pluggable CPUs"
 289        depends on SMP
 290        select HOTPLUG
 291        help
 292          Say Y here to be able to turn CPUs off and on. CPUs
 293          can be controlled through /sys/devices/system/cpu/cpu#.
 294          Say N if you want to disable CPU hotplug.
 295
 296config SCHED_MC
 297        def_bool n
 298
 299config SCHED_BOOK
 300        def_bool y
 301        prompt "Book scheduler support"
 302        depends on SMP
 303        select SCHED_MC
 304        help
 305          Book scheduler support improves the CPU scheduler's decision making
 306          when dealing with machines that have several books.
 307
 308source kernel/Kconfig.preempt
 309
 310config MATHEMU
 311        def_bool y
 312        prompt "IEEE FPU emulation"
 313        depends on MARCH_G5
 314        help
 315          This option is required for IEEE compliant floating point arithmetic
 316          on older ESA/390 machines. Say Y unless you know your machine doesn't
 317          need this.
 318
 319source kernel/Kconfig.hz
 320
 321endmenu
 322
 323menu "Memory setup"
 324
 325config ARCH_SPARSEMEM_ENABLE
 326        def_bool y
 327        select SPARSEMEM_VMEMMAP_ENABLE
 328        select SPARSEMEM_VMEMMAP
 329        select SPARSEMEM_STATIC if !64BIT
 330
 331config ARCH_SPARSEMEM_DEFAULT
 332        def_bool y
 333
 334config ARCH_SELECT_MEMORY_MODEL
 335        def_bool y
 336
 337config ARCH_ENABLE_MEMORY_HOTPLUG
 338        def_bool y if SPARSEMEM
 339
 340config ARCH_ENABLE_MEMORY_HOTREMOVE
 341        def_bool y
 342
 343config FORCE_MAX_ZONEORDER
 344        int
 345        default "9"
 346
 347source "mm/Kconfig"
 348
 349config PACK_STACK
 350        def_bool y
 351        prompt "Pack kernel stack"
 352        help
 353          This option enables the compiler option -mkernel-backchain if it
 354          is available. If the option is available the compiler supports
 355          the new stack layout which dramatically reduces the minimum stack
 356          frame size. With an old compiler a non-leaf function needs a
 357          minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 358          -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 359          and 24 byte on 64 bit.
 360
 361          Say Y if you are unsure.
 362
 363config SMALL_STACK
 364        def_bool n
 365        prompt "Use 8kb for kernel stack instead of 16kb"
 366        depends on PACK_STACK && 64BIT && !LOCKDEP
 367        help
 368          If you say Y here and the compiler supports the -mkernel-backchain
 369          option the kernel will use a smaller kernel stack size. The reduced
 370          size is 8kb instead of 16kb. This allows to run more threads on a
 371          system and reduces the pressure on the memory management for higher
 372          order page allocations.
 373
 374          Say N if you are unsure.
 375
 376config CHECK_STACK
 377        def_bool y
 378        prompt "Detect kernel stack overflow"
 379        help
 380          This option enables the compiler option -mstack-guard and
 381          -mstack-size if they are available. If the compiler supports them
 382          it will emit additional code to each function prolog to trigger
 383          an illegal operation if the kernel stack is about to overflow.
 384
 385          Say N if you are unsure.
 386
 387config STACK_GUARD
 388        int "Size of the guard area (128-1024)"
 389        range 128 1024
 390        depends on CHECK_STACK
 391        default "256"
 392        help
 393          This allows you to specify the size of the guard area at the lower
 394          end of the kernel stack. If the kernel stack points into the guard
 395          area on function entry an illegal operation is triggered. The size
 396          needs to be a power of 2. Please keep in mind that the size of an
 397          interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 398          The minimum size for the stack guard should be 256 for 31 bit and
 399          512 for 64 bit.
 400
 401config WARN_DYNAMIC_STACK
 402        def_bool n
 403        prompt "Emit compiler warnings for function with dynamic stack usage"
 404        help
 405          This option enables the compiler option -mwarn-dynamicstack. If the
 406          compiler supports this options generates warnings for functions
 407          that dynamically allocate stack space using alloca.
 408
 409          Say N if you are unsure.
 410
 411endmenu
 412
 413menu "I/O subsystem"
 414
 415config QDIO
 416        def_tristate y
 417        prompt "QDIO support"
 418        ---help---
 419          This driver provides the Queued Direct I/O base support for
 420          IBM System z.
 421
 422          To compile this driver as a module, choose M here: the
 423          module will be called qdio.
 424
 425          If unsure, say Y.
 426
 427config CHSC_SCH
 428        def_tristate m
 429        prompt "Support for CHSC subchannels"
 430        help
 431          This driver allows usage of CHSC subchannels. A CHSC subchannel
 432          is usually present on LPAR only.
 433          The driver creates a device /dev/chsc, which may be used to
 434          obtain I/O configuration information about the machine and
 435          to issue asynchronous chsc commands (DANGEROUS).
 436          You will usually only want to use this interface on a special
 437          LPAR designated for system management.
 438
 439          To compile this driver as a module, choose M here: the
 440          module will be called chsc_sch.
 441
 442          If unsure, say N.
 443
 444config SCM_BUS
 445        def_bool y
 446        depends on 64BIT
 447        prompt "SCM bus driver"
 448        help
 449          Bus driver for Storage Class Memory.
 450
 451config EADM_SCH
 452        def_tristate m
 453        prompt "Support for EADM subchannels"
 454        depends on SCM_BUS
 455        help
 456          This driver allows usage of EADM subchannels. EADM subchannels act
 457          as a communication vehicle for SCM increments.
 458
 459          To compile this driver as a module, choose M here: the
 460          module will be called eadm_sch.
 461
 462endmenu
 463
 464menu "Dump support"
 465
 466config CRASH_DUMP
 467        bool "kernel crash dumps"
 468        depends on 64BIT && SMP
 469        select KEXEC
 470        help
 471          Generate crash dump after being started by kexec.
 472          Crash dump kernels are loaded in the main kernel with kexec-tools
 473          into a specially reserved region and then later executed after
 474          a crash by kdump/kexec.
 475          For more details see Documentation/kdump/kdump.txt
 476
 477config ZFCPDUMP
 478        def_bool n
 479        prompt "zfcpdump support"
 480        select SMP
 481        help
 482          Select this option if you want to build an zfcpdump enabled kernel.
 483          Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 484
 485endmenu
 486
 487menu "Executable file formats / Emulations"
 488
 489source "fs/Kconfig.binfmt"
 490
 491config SECCOMP
 492        def_bool y
 493        prompt "Enable seccomp to safely compute untrusted bytecode"
 494        depends on PROC_FS
 495        help
 496          This kernel feature is useful for number crunching applications
 497          that may need to compute untrusted bytecode during their
 498          execution. By using pipes or other transports made available to
 499          the process as file descriptors supporting the read/write
 500          syscalls, it's possible to isolate those applications in
 501          their own address space using seccomp. Once seccomp is
 502          enabled via /proc/<pid>/seccomp, it cannot be disabled
 503          and the task is only allowed to execute a few safe syscalls
 504          defined by each seccomp mode.
 505
 506          If unsure, say Y.
 507
 508endmenu
 509
 510menu "Power Management"
 511
 512config ARCH_HIBERNATION_POSSIBLE
 513        def_bool y if 64BIT
 514
 515source "kernel/power/Kconfig"
 516
 517endmenu
 518
 519source "net/Kconfig"
 520
 521config PCMCIA
 522        def_bool n
 523
 524config CCW
 525        def_bool y
 526
 527source "drivers/Kconfig"
 528
 529source "fs/Kconfig"
 530
 531source "arch/s390/Kconfig.debug"
 532
 533source "security/Kconfig"
 534
 535source "crypto/Kconfig"
 536
 537source "lib/Kconfig"
 538
 539menu "Virtualization"
 540
 541config PFAULT
 542        def_bool y
 543        prompt "Pseudo page fault support"
 544        help
 545          Select this option, if you want to use PFAULT pseudo page fault
 546          handling under VM. If running native or in LPAR, this option
 547          has no effect. If your VM does not support PFAULT, PAGEEX
 548          pseudo page fault handling will be used.
 549          Note that VM 4.2 supports PFAULT but has a bug in its
 550          implementation that causes some problems.
 551          Everybody who wants to run Linux under VM != VM4.2 should select
 552          this option.
 553
 554config SHARED_KERNEL
 555        bool "VM shared kernel support"
 556        depends on !JUMP_LABEL
 557        help
 558          Select this option, if you want to share the text segment of the
 559          Linux kernel between different VM guests. This reduces memory
 560          usage with lots of guests but greatly increases kernel size.
 561          Also if a kernel was IPL'ed from a shared segment the kexec system
 562          call will not work.
 563          You should only select this option if you know what you are
 564          doing and want to exploit this feature.
 565
 566config CMM
 567        def_tristate n
 568        prompt "Cooperative memory management"
 569        help
 570          Select this option, if you want to enable the kernel interface
 571          to reduce the memory size of the system. This is accomplished
 572          by allocating pages of memory and put them "on hold". This only
 573          makes sense for a system running under VM where the unused pages
 574          will be reused by VM for other guest systems. The interface
 575          allows an external monitor to balance memory of many systems.
 576          Everybody who wants to run Linux under VM should select this
 577          option.
 578
 579config CMM_IUCV
 580        def_bool y
 581        prompt "IUCV special message interface to cooperative memory management"
 582        depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 583        help
 584          Select this option to enable the special message interface to
 585          the cooperative memory management.
 586
 587config APPLDATA_BASE
 588        def_bool n
 589        prompt "Linux - VM Monitor Stream, base infrastructure"
 590        depends on PROC_FS
 591        help
 592          This provides a kernel interface for creating and updating z/VM APPLDATA
 593          monitor records. The monitor records are updated at certain time
 594          intervals, once the timer is started.
 595          Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 596          i.e. enables or disables monitoring on the Linux side.
 597          A custom interval value (in seconds) can be written to
 598          /proc/appldata/interval.
 599
 600          Defaults are 60 seconds interval and timer off.
 601          The /proc entries can also be read from, showing the current settings.
 602
 603config APPLDATA_MEM
 604        def_tristate m
 605        prompt "Monitor memory management statistics"
 606        depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 607        help
 608          This provides memory management related data to the Linux - VM Monitor
 609          Stream, like paging/swapping rate, memory utilisation, etc.
 610          Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 611          APPLDATA monitor record, i.e. enables or disables monitoring this record
 612          on the z/VM side.
 613
 614          Default is disabled.
 615          The /proc entry can also be read from, showing the current settings.
 616
 617          This can also be compiled as a module, which will be called
 618          appldata_mem.o.
 619
 620config APPLDATA_OS
 621        def_tristate m
 622        prompt "Monitor OS statistics"
 623        depends on APPLDATA_BASE
 624        help
 625          This provides OS related data to the Linux - VM Monitor Stream, like
 626          CPU utilisation, etc.
 627          Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 628          APPLDATA monitor record, i.e. enables or disables monitoring this record
 629          on the z/VM side.
 630
 631          Default is disabled.
 632          This can also be compiled as a module, which will be called
 633          appldata_os.o.
 634
 635config APPLDATA_NET_SUM
 636        def_tristate m
 637        prompt "Monitor overall network statistics"
 638        depends on APPLDATA_BASE && NET
 639        help
 640          This provides network related data to the Linux - VM Monitor Stream,
 641          currently there is only a total sum of network I/O statistics, no
 642          per-interface data.
 643          Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 644          APPLDATA monitor record, i.e. enables or disables monitoring this record
 645          on the z/VM side.
 646
 647          Default is disabled.
 648          This can also be compiled as a module, which will be called
 649          appldata_net_sum.o.
 650
 651config S390_HYPFS_FS
 652        def_bool y
 653        prompt "s390 hypervisor file system support"
 654        select SYS_HYPERVISOR
 655        help
 656          This is a virtual file system intended to provide accounting
 657          information in an s390 hypervisor environment.
 658
 659source "arch/s390/kvm/Kconfig"
 660
 661config S390_GUEST
 662        def_bool y
 663        prompt "s390 support for virtio devices (EXPERIMENTAL)"
 664        depends on 64BIT && EXPERIMENTAL
 665        select VIRTUALIZATION
 666        select VIRTIO
 667        select VIRTIO_CONSOLE
 668        help
 669          Enabling this option adds support for virtio based paravirtual device
 670          drivers on s390.
 671
 672          Select this option if you want to run the kernel as a guest under
 673          the KVM hypervisor.
 674
 675endmenu
 676
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