arch/s390/Kconfig

   1 config SCHED_MC
   2         def_bool y
   3         depends on SMP
   4
   5 config MMU
   6         def_bool y
   7
   8 config ZONE_DMA
   9         def_bool y
  10         depends on 64BIT
  11
  12 config LOCKDEP_SUPPORT
  13         def_bool y
  14
  15 config STACKTRACE_SUPPORT
  16         def_bool y
  17
  18 config HAVE_LATENCYTOP_SUPPORT
  19         def_bool y
  20
  21 config RWSEM_GENERIC_SPINLOCK
  22         bool
  23
  24 config RWSEM_XCHGADD_ALGORITHM
  25         def_bool y
  26
  27 config ARCH_HAS_ILOG2_U32
  28         bool
  29         default n
  30
  31 config ARCH_HAS_ILOG2_U64
  32         bool
  33         default n
  34
  35 config GENERIC_HWEIGHT
  36         def_bool y
  37
  38 config GENERIC_TIME
  39         def_bool y
  40
  41 config GENERIC_TIME_VSYSCALL
  42         def_bool y
  43
  44 config GENERIC_CLOCKEVENTS
  45         def_bool y
  46
  47 config GENERIC_BUG
  48         bool
  49         depends on BUG
  50         default y
  51
  52 config GENERIC_BUG_RELATIVE_POINTERS
  53         def_bool y
  54
  55 config NO_IOMEM
  56         def_bool y
  57
  58 config NO_DMA
  59         def_bool y
  60
  61 config GENERIC_LOCKBREAK
  62         bool
  63         default y
  64         depends on SMP && PREEMPT
  65
  66 config PGSTE
  67         bool
  68         default y if KVM
  69
  70 config VIRT_CPU_ACCOUNTING
  71         def_bool y
  72
  73 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  74         def_bool y
  75
  76 config S390
  77         def_bool y
  78         select USE_GENERIC_SMP_HELPERS if SMP
  79         select HAVE_SYSCALL_WRAPPERS
  80         select HAVE_FUNCTION_TRACER
  81         select HAVE_FUNCTION_TRACE_MCOUNT_TEST
  82         select HAVE_FTRACE_MCOUNT_RECORD
  83         select HAVE_SYSCALL_TRACEPOINTS
  84         select HAVE_DYNAMIC_FTRACE
  85         select HAVE_FUNCTION_GRAPH_TRACER
  86         select HAVE_REGS_AND_STACK_ACCESS_API
  87         select HAVE_DEFAULT_NO_SPIN_MUTEXES
  88         select HAVE_OPROFILE
  89         select HAVE_KPROBES
  90         select HAVE_KRETPROBES
  91         select HAVE_KVM if 64BIT
  92         select HAVE_ARCH_TRACEHOOK
  93         select INIT_ALL_POSSIBLE
  94         select HAVE_PERF_EVENTS
  95         select HAVE_KERNEL_GZIP
  96         select HAVE_KERNEL_BZIP2
  97         select HAVE_KERNEL_LZMA
  98         select HAVE_KERNEL_LZO
  99         select ARCH_INLINE_SPIN_TRYLOCK
 100         select ARCH_INLINE_SPIN_TRYLOCK_BH
 101         select ARCH_INLINE_SPIN_LOCK
 102         select ARCH_INLINE_SPIN_LOCK_BH
 103         select ARCH_INLINE_SPIN_LOCK_IRQ
 104         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
 105         select ARCH_INLINE_SPIN_UNLOCK
 106         select ARCH_INLINE_SPIN_UNLOCK_BH
 107         select ARCH_INLINE_SPIN_UNLOCK_IRQ
 108         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
 109         select ARCH_INLINE_READ_TRYLOCK
 110         select ARCH_INLINE_READ_LOCK
 111         select ARCH_INLINE_READ_LOCK_BH
 112         select ARCH_INLINE_READ_LOCK_IRQ
 113         select ARCH_INLINE_READ_LOCK_IRQSAVE
 114         select ARCH_INLINE_READ_UNLOCK
 115         select ARCH_INLINE_READ_UNLOCK_BH
 116         select ARCH_INLINE_READ_UNLOCK_IRQ
 117         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
 118         select ARCH_INLINE_WRITE_TRYLOCK
 119         select ARCH_INLINE_WRITE_LOCK
 120         select ARCH_INLINE_WRITE_LOCK_BH
 121         select ARCH_INLINE_WRITE_LOCK_IRQ
 122         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 123         select ARCH_INLINE_WRITE_UNLOCK
 124         select ARCH_INLINE_WRITE_UNLOCK_BH
 125         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 126         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 127
 128 config SCHED_OMIT_FRAME_POINTER
 129         bool
 130         default y
 131
 132 source "init/Kconfig"
 133
 134 source "kernel/Kconfig.freezer"
 135
 136 menu "Base setup"
 137
 138 comment "Processor type and features"
 139
 140 source "kernel/time/Kconfig"
 141
 142 config 64BIT
 143         bool "64 bit kernel"
 144         help
 145           Select this option if you have a 64 bit IBM zSeries machine
 146           and want to use the 64 bit addressing mode.
 147
 148 config 32BIT
 149         bool
 150         default y if !64BIT
 151
 152 config KTIME_SCALAR
 153         def_bool 32BIT
 154
 155 config SMP
 156         bool "Symmetric multi-processing support"
 157         ---help---
 158           This enables support for systems with more than one CPU. If you have
 159           a system with only one CPU, like most personal computers, say N. If
 160           you have a system with more than one CPU, say Y.
 161
 162           If you say N here, the kernel will run on single and multiprocessor
 163           machines, but will use only one CPU of a multiprocessor machine. If
 164           you say Y here, the kernel will run on many, but not all,
 165           singleprocessor machines. On a singleprocessor machine, the kernel
 166           will run faster if you say N here.
 167
 168           See also the SMP-HOWTO available at
 169           <http://www.tldp.org/docs.html#howto>.
 170
 171           Even if you don't know what to do here, say Y.
 172
 173 config NR_CPUS
 174         int "Maximum number of CPUs (2-64)"
 175         range 2 64
 176         depends on SMP
 177         default "32" if !64BIT
 178         default "64" if 64BIT
 179         help
 180           This allows you to specify the maximum number of CPUs which this
 181           kernel will support.  The maximum supported value is 64 and the
 182           minimum value which makes sense is 2.
 183
 184           This is purely to save memory - each supported CPU adds
 185           approximately sixteen kilobytes to the kernel image.
 186
 187 config HOTPLUG_CPU
 188         bool "Support for hot-pluggable CPUs"
 189         depends on SMP
 190         select HOTPLUG
 191         default n
 192         help
 193           Say Y here to be able to turn CPUs off and on. CPUs
 194           can be controlled through /sys/devices/system/cpu/cpu#.
 195           Say N if you want to disable CPU hotplug.
 196
 197 config MATHEMU
 198         bool "IEEE FPU emulation"
 199         depends on MARCH_G5
 200         help
 201           This option is required for IEEE compliant floating point arithmetic
 202           on older S/390 machines. Say Y unless you know your machine doesn't
 203           need this.
 204
 205 config COMPAT
 206         bool "Kernel support for 31 bit emulation"
 207         depends on 64BIT
 208         select COMPAT_BINFMT_ELF
 209         help
 210           Select this option if you want to enable your system kernel to
 211           handle system-calls from ELF binaries for 31 bit ESA.  This option
 212           (and some other stuff like libraries and such) is needed for
 213           executing 31 bit applications.  It is safe to say "Y".
 214
 215 config SYSVIPC_COMPAT
 216         bool
 217         depends on COMPAT && SYSVIPC
 218         default y
 219
 220 config AUDIT_ARCH
 221         bool
 222         default y
 223
 224 config S390_EXEC_PROTECT
 225         bool "Data execute protection"
 226         help
 227           This option allows to enable a buffer overflow protection for user
 228           space programs and it also selects the addressing mode option above.
 229           The kernel parameter noexec=on will enable this feature and also
 230           switch the addressing modes, default is disabled. Enabling this (via
 231           kernel parameter) on machines earlier than IBM System z9-109 EC/BC
 232           will reduce system performance.
 233
 234 comment "Code generation options"
 235
 236 choice
 237         prompt "Processor type"
 238         default MARCH_G5
 239
 240 config MARCH_G5
 241         bool "S/390 model G5 and G6"
 242         depends on !64BIT
 243         help
 244           Select this to build a 31 bit kernel that works
 245           on all S/390 and zSeries machines.
 246
 247 config MARCH_Z900
 248         bool "IBM eServer zSeries model z800 and z900"
 249         help
 250           Select this to optimize for zSeries machines. This
 251           will enable some optimizations that are not available
 252           on older 31 bit only CPUs.
 253
 254 config MARCH_Z990
 255         bool "IBM eServer zSeries model z890 and z990"
 256         help
 257           Select this enable optimizations for model z890/z990.
 258           This will be slightly faster but does not work on
 259           older machines such as the z900.
 260
 261 config MARCH_Z9_109
 262         bool "IBM System z9"
 263         help
 264           Select this to enable optimizations for IBM System z9-109, IBM
 265           System z9 Enterprise Class (z9 EC), and IBM System z9 Business
 266           Class (z9 BC). The kernel will be slightly faster but will not
 267           work on older machines such as the z990, z890, z900, and z800.
 268
 269 config MARCH_Z10
 270         bool "IBM System z10"
 271         help
 272           Select this to enable optimizations for IBM System z10. The
 273           kernel will be slightly faster but will not work on older
 274           machines such as the z990, z890, z900, z800, z9-109, z9-ec
 275           and z9-bc.
 276
 277 endchoice
 278
 279 config PACK_STACK
 280         bool "Pack kernel stack"
 281         help
 282           This option enables the compiler option -mkernel-backchain if it
 283           is available. If the option is available the compiler supports
 284           the new stack layout which dramatically reduces the minimum stack
 285           frame size. With an old compiler a non-leaf function needs a
 286           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 287           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 288           and 24 byte on 64 bit.
 289
 290           Say Y if you are unsure.
 291
 292 config SMALL_STACK
 293         bool "Use 8kb for kernel stack instead of 16kb"
 294         depends on PACK_STACK && 64BIT && !LOCKDEP
 295         help
 296           If you say Y here and the compiler supports the -mkernel-backchain
 297           option the kernel will use a smaller kernel stack size. The reduced
 298           size is 8kb instead of 16kb. This allows to run more threads on a
 299           system and reduces the pressure on the memory management for higher
 300           order page allocations.
 301
 302           Say N if you are unsure.
 303
 304 config CHECK_STACK
 305         bool "Detect kernel stack overflow"
 306         help
 307           This option enables the compiler option -mstack-guard and
 308           -mstack-size if they are available. If the compiler supports them
 309           it will emit additional code to each function prolog to trigger
 310           an illegal operation if the kernel stack is about to overflow.
 311
 312           Say N if you are unsure.
 313
 314 config STACK_GUARD
 315         int "Size of the guard area (128-1024)"
 316         range 128 1024
 317         depends on CHECK_STACK
 318         default "256"
 319         help
 320           This allows you to specify the size of the guard area at the lower
 321           end of the kernel stack. If the kernel stack points into the guard
 322           area on function entry an illegal operation is triggered. The size
 323           needs to be a power of 2. Please keep in mind that the size of an
 324           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 325           The minimum size for the stack guard should be 256 for 31 bit and
 326           512 for 64 bit.
 327
 328 config WARN_STACK
 329         bool "Emit compiler warnings for function with broken stack usage"
 330         help
 331           This option enables the compiler options -mwarn-framesize and
 332           -mwarn-dynamicstack. If the compiler supports these options it
 333           will generate warnings for function which either use alloca or
 334           create a stack frame bigger than CONFIG_WARN_STACK_SIZE.
 335
 336           Say N if you are unsure.
 337
 338 config WARN_STACK_SIZE
 339         int "Maximum frame size considered safe (128-2048)"
 340         range 128 2048
 341         depends on WARN_STACK
 342         default "2048"
 343         help
 344           This allows you to specify the maximum frame size a function may
 345           have without the compiler complaining about it.
 346
 347 config ARCH_POPULATES_NODE_MAP
 348         def_bool y
 349
 350 comment "Kernel preemption"
 351
 352 source "kernel/Kconfig.preempt"
 353
 354 config ARCH_SPARSEMEM_ENABLE
 355         def_bool y
 356         select SPARSEMEM_VMEMMAP_ENABLE
 357         select SPARSEMEM_VMEMMAP
 358         select SPARSEMEM_STATIC if !64BIT
 359
 360 config ARCH_SPARSEMEM_DEFAULT
 361         def_bool y
 362
 363 config ARCH_SELECT_MEMORY_MODEL
 364        def_bool y
 365
 366 config ARCH_ENABLE_MEMORY_HOTPLUG
 367         def_bool y
 368         depends on SPARSEMEM
 369
 370 config ARCH_ENABLE_MEMORY_HOTREMOVE
 371         def_bool y
 372
 373 config ARCH_HIBERNATION_POSSIBLE
 374        def_bool y if 64BIT
 375
 376 source "mm/Kconfig"
 377
 378 comment "I/O subsystem configuration"
 379
 380 config QDIO
 381         tristate "QDIO support"
 382         ---help---
 383           This driver provides the Queued Direct I/O base support for
 384           IBM System z.
 385
 386           To compile this driver as a module, choose M here: the
 387           module will be called qdio.
 388
 389           If unsure, say Y.
 390
 391 config CHSC_SCH
 392         tristate "Support for CHSC subchannels"
 393         help
 394           This driver allows usage of CHSC subchannels. A CHSC subchannel
 395           is usually present on LPAR only.
 396           The driver creates a device /dev/chsc, which may be used to
 397           obtain I/O configuration information about the machine and
 398           to issue asynchronous chsc commands (DANGEROUS).
 399           You will usually only want to use this interface on a special
 400           LPAR designated for system management.
 401
 402           To compile this driver as a module, choose M here: the
 403           module will be called chsc_sch.
 404
 405           If unsure, say N.
 406
 407 comment "Misc"
 408
 409 config IPL
 410         bool "Builtin IPL record support"
 411         help
 412           If you want to use the produced kernel to IPL directly from a
 413           device, you have to merge a bootsector specific to the device
 414           into the first bytes of the kernel. You will have to select the
 415           IPL device.
 416
 417 choice
 418         prompt "IPL method generated into head.S"
 419         depends on IPL
 420         default IPL_VM
 421         help
 422           Select "tape" if you want to IPL the image from a Tape.
 423
 424           Select "vm_reader" if you are running under VM/ESA and want
 425           to IPL the image from the emulated card reader.
 426
 427 config IPL_TAPE
 428         bool "tape"
 429
 430 config IPL_VM
 431         bool "vm_reader"
 432
 433 endchoice
 434
 435 source "fs/Kconfig.binfmt"
 436
 437 config FORCE_MAX_ZONEORDER
 438         int
 439         default "9"
 440
 441 config PFAULT
 442         bool "Pseudo page fault support"
 443         help
 444           Select this option, if you want to use PFAULT pseudo page fault
 445           handling under VM. If running native or in LPAR, this option
 446           has no effect. If your VM does not support PFAULT, PAGEEX
 447           pseudo page fault handling will be used.
 448           Note that VM 4.2 supports PFAULT but has a bug in its
 449           implementation that causes some problems.
 450           Everybody who wants to run Linux under VM != VM4.2 should select
 451           this option.
 452
 453 config SHARED_KERNEL
 454         bool "VM shared kernel support"
 455         help
 456           Select this option, if you want to share the text segment of the
 457           Linux kernel between different VM guests. This reduces memory
 458           usage with lots of guests but greatly increases kernel size.
 459           Also if a kernel was IPL'ed from a shared segment the kexec system
 460           call will not work.
 461           You should only select this option if you know what you are
 462           doing and want to exploit this feature.
 463
 464 config CMM
 465         tristate "Cooperative memory management"
 466         help
 467           Select this option, if you want to enable the kernel interface
 468           to reduce the memory size of the system. This is accomplished
 469           by allocating pages of memory and put them "on hold". This only
 470           makes sense for a system running under VM where the unused pages
 471           will be reused by VM for other guest systems. The interface
 472           allows an external monitor to balance memory of many systems.
 473           Everybody who wants to run Linux under VM should select this
 474           option.
 475
 476 config CMM_IUCV
 477         bool "IUCV special message interface to cooperative memory management"
 478         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 479         help
 480           Select this option to enable the special message interface to
 481           the cooperative memory management.
 482
 483 config APPLDATA_BASE
 484         bool "Linux - VM Monitor Stream, base infrastructure"
 485         depends on PROC_FS
 486         help
 487           This provides a kernel interface for creating and updating z/VM APPLDATA
 488           monitor records. The monitor records are updated at certain time
 489           intervals, once the timer is started.
 490           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 491           i.e. enables or disables monitoring on the Linux side.
 492           A custom interval value (in seconds) can be written to
 493           /proc/appldata/interval.
 494
 495           Defaults are 60 seconds interval and timer off.
 496           The /proc entries can also be read from, showing the current settings.
 497
 498 config APPLDATA_MEM
 499         tristate "Monitor memory management statistics"
 500         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 501         help
 502           This provides memory management related data to the Linux - VM Monitor
 503           Stream, like paging/swapping rate, memory utilisation, etc.
 504           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 505           APPLDATA monitor record, i.e. enables or disables monitoring this record
 506           on the z/VM side.
 507
 508           Default is disabled.
 509           The /proc entry can also be read from, showing the current settings.
 510
 511           This can also be compiled as a module, which will be called
 512           appldata_mem.o.
 513
 514 config APPLDATA_OS
 515         tristate "Monitor OS statistics"
 516         depends on APPLDATA_BASE
 517         help
 518           This provides OS related data to the Linux - VM Monitor Stream, like
 519           CPU utilisation, etc.
 520           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 521           APPLDATA monitor record, i.e. enables or disables monitoring this record
 522           on the z/VM side.
 523
 524           Default is disabled.
 525           This can also be compiled as a module, which will be called
 526           appldata_os.o.
 527
 528 config APPLDATA_NET_SUM
 529         tristate "Monitor overall network statistics"
 530         depends on APPLDATA_BASE && NET
 531         help
 532           This provides network related data to the Linux - VM Monitor Stream,
 533           currently there is only a total sum of network I/O statistics, no
 534           per-interface data.
 535           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 536           APPLDATA monitor record, i.e. enables or disables monitoring this record
 537           on the z/VM side.
 538
 539           Default is disabled.
 540           This can also be compiled as a module, which will be called
 541           appldata_net_sum.o.
 542
 543 source kernel/Kconfig.hz
 544
 545 config S390_HYPFS_FS
 546         bool "s390 hypervisor file system support"
 547         select SYS_HYPERVISOR
 548         default y
 549         help
 550           This is a virtual file system intended to provide accounting
 551           information in an s390 hypervisor environment.
 552
 553 config KEXEC
 554         bool "kexec system call"
 555         help
 556           kexec is a system call that implements the ability to shutdown your
 557           current kernel, and to start another kernel.  It is like a reboot
 558           but is independent of hardware/microcode support.
 559
 560 config ZFCPDUMP
 561         bool "zfcpdump support"
 562         select SMP
 563         default n
 564         help
 565           Select this option if you want to build an zfcpdump enabled kernel.
 566           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 567
 568 config S390_GUEST
 569 bool "s390 guest support for KVM (EXPERIMENTAL)"
 570         depends on 64BIT && EXPERIMENTAL
 571         select VIRTIO
 572         select VIRTIO_RING
 573         select VIRTIO_CONSOLE
 574         help
 575           Select this option if you want to run the kernel as a guest under
 576           the KVM hypervisor. This will add detection for KVM as well  as a
 577           virtio transport. If KVM is detected, the virtio console will be
 578           the default console.
 579
 580 config SECCOMP
 581         bool "Enable seccomp to safely compute untrusted bytecode"
 582         depends on PROC_FS
 583         default y
 584         help
 585           This kernel feature is useful for number crunching applications
 586           that may need to compute untrusted bytecode during their
 587           execution. By using pipes or other transports made available to
 588           the process as file descriptors supporting the read/write
 589           syscalls, it's possible to isolate those applications in
 590           their own address space using seccomp. Once seccomp is
 591           enabled via /proc/<pid>/seccomp, it cannot be disabled
 592           and the task is only allowed to execute a few safe syscalls
 593           defined by each seccomp mode.
 594
 595           If unsure, say Y.
 596
 597 endmenu
 598
 599 menu "Power Management"
 600
 601 source "kernel/power/Kconfig"
 602
 603 endmenu
 604
 605 source "net/Kconfig"
 606
 607 config PCMCIA
 608         def_bool n
 609
 610 config CCW
 611         def_bool y
 612
 613 source "drivers/Kconfig"
 614
 615 source "fs/Kconfig"
 616
 617 source "arch/s390/Kconfig.debug"
 618
 619 source "security/Kconfig"
 620
 621 source "crypto/Kconfig"
 622
 623 source "lib/Kconfig"
 624
 625 source "arch/s390/kvm/Kconfig"