arch/s390/Kconfig

   1 #
   2 # For a description of the syntax of this configuration file,
   3 # see Documentation/kbuild/kconfig-language.txt.
   4 #
   5
   6 config SCHED_MC
   7         def_bool y
   8         depends on SMP
   9
  10 config MMU
  11         def_bool y
  12
  13 config ZONE_DMA
  14         def_bool y
  15         depends on 64BIT
  16
  17 config LOCKDEP_SUPPORT
  18         def_bool y
  19
  20 config STACKTRACE_SUPPORT
  21         def_bool y
  22
  23 config HAVE_LATENCYTOP_SUPPORT
  24         def_bool y
  25
  26 config RWSEM_GENERIC_SPINLOCK
  27         bool
  28
  29 config RWSEM_XCHGADD_ALGORITHM
  30         def_bool y
  31
  32 config ARCH_HAS_ILOG2_U32
  33         bool
  34         default n
  35
  36 config ARCH_HAS_ILOG2_U64
  37         bool
  38         default n
  39
  40 config GENERIC_HWEIGHT
  41         def_bool y
  42
  43 config GENERIC_TIME
  44         def_bool y
  45
  46 config GENERIC_TIME_VSYSCALL
  47         def_bool y
  48
  49 config GENERIC_CLOCKEVENTS
  50         def_bool y
  51
  52 config GENERIC_BUG
  53         bool
  54         depends on BUG
  55         default y
  56
  57 config NO_IOMEM
  58         def_bool y
  59
  60 config NO_DMA
  61         def_bool y
  62
  63 config GENERIC_LOCKBREAK
  64         bool
  65         default y
  66         depends on SMP && PREEMPT
  67
  68 config PGSTE
  69         bool
  70         default y if KVM
  71
  72 config VIRT_CPU_ACCOUNTING
  73         def_bool y
  74
  75 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  76         def_bool y
  77
  78 mainmenu "Linux Kernel Configuration"
  79
  80 config S390
  81         def_bool y
  82         select USE_GENERIC_SMP_HELPERS if SMP
  83         select HAVE_SYSCALL_WRAPPERS
  84         select HAVE_FUNCTION_TRACER
  85         select HAVE_DEFAULT_NO_SPIN_MUTEXES
  86         select HAVE_OPROFILE
  87         select HAVE_KPROBES
  88         select HAVE_KRETPROBES
  89         select HAVE_KVM if 64BIT
  90         select HAVE_ARCH_TRACEHOOK
  91         select INIT_ALL_POSSIBLE
  92
  93 source "init/Kconfig"
  94
  95 source "kernel/Kconfig.freezer"
  96
  97 menu "Base setup"
  98
  99 comment "Processor type and features"
 100
 101 source "kernel/time/Kconfig"
 102
 103 config 64BIT
 104         bool "64 bit kernel"
 105         help
 106           Select this option if you have a 64 bit IBM zSeries machine
 107           and want to use the 64 bit addressing mode.
 108
 109 config 32BIT
 110         bool
 111         default y if !64BIT
 112
 113 config SMP
 114         bool "Symmetric multi-processing support"
 115         ---help---
 116           This enables support for systems with more than one CPU. If you have
 117           a system with only one CPU, like most personal computers, say N. If
 118           you have a system with more than one CPU, say Y.
 119
 120           If you say N here, the kernel will run on single and multiprocessor
 121           machines, but will use only one CPU of a multiprocessor machine. If
 122           you say Y here, the kernel will run on many, but not all,
 123           singleprocessor machines. On a singleprocessor machine, the kernel
 124           will run faster if you say N here.
 125
 126           See also the SMP-HOWTO available at
 127           <http://www.tldp.org/docs.html#howto>.
 128
 129           Even if you don't know what to do here, say Y.
 130
 131 config NR_CPUS
 132         int "Maximum number of CPUs (2-64)"
 133         range 2 64
 134         depends on SMP
 135         default "32" if !64BIT
 136         default "64" if 64BIT
 137         help
 138           This allows you to specify the maximum number of CPUs which this
 139           kernel will support.  The maximum supported value is 64 and the
 140           minimum value which makes sense is 2.
 141
 142           This is purely to save memory - each supported CPU adds
 143           approximately sixteen kilobytes to the kernel image.
 144
 145 config HOTPLUG_CPU
 146         bool "Support for hot-pluggable CPUs"
 147         depends on SMP
 148         select HOTPLUG
 149         default n
 150         help
 151           Say Y here to be able to turn CPUs off and on. CPUs
 152           can be controlled through /sys/devices/system/cpu/cpu#.
 153           Say N if you want to disable CPU hotplug.
 154
 155 config MATHEMU
 156         bool "IEEE FPU emulation"
 157         depends on MARCH_G5
 158         help
 159           This option is required for IEEE compliant floating point arithmetic
 160           on older S/390 machines. Say Y unless you know your machine doesn't
 161           need this.
 162
 163 config COMPAT
 164         bool "Kernel support for 31 bit emulation"
 165         depends on 64BIT
 166         select COMPAT_BINFMT_ELF
 167         help
 168           Select this option if you want to enable your system kernel to
 169           handle system-calls from ELF binaries for 31 bit ESA.  This option
 170           (and some other stuff like libraries and such) is needed for
 171           executing 31 bit applications.  It is safe to say "Y".
 172
 173 config SYSVIPC_COMPAT
 174         bool
 175         depends on COMPAT && SYSVIPC
 176         default y
 177
 178 config AUDIT_ARCH
 179         bool
 180         default y
 181
 182 config S390_SWITCH_AMODE
 183         bool "Switch kernel/user addressing modes"
 184         help
 185           This option allows to switch the addressing modes of kernel and user
 186           space. The kernel parameter switch_amode=on will enable this feature,
 187           default is disabled. Enabling this (via kernel parameter) on machines
 188           earlier than IBM System z9-109 EC/BC will reduce system performance.
 189
 190           Note that this option will also be selected by selecting the execute
 191           protection option below. Enabling the execute protection via the
 192           noexec kernel parameter will also switch the addressing modes,
 193           independent of the switch_amode kernel parameter.
 194
 195
 196 config S390_EXEC_PROTECT
 197         bool "Data execute protection"
 198         select S390_SWITCH_AMODE
 199         help
 200           This option allows to enable a buffer overflow protection for user
 201           space programs and it also selects the addressing mode option above.
 202           The kernel parameter noexec=on will enable this feature and also
 203           switch the addressing modes, default is disabled. Enabling this (via
 204           kernel parameter) on machines earlier than IBM System z9-109 EC/BC
 205           will reduce system performance.
 206
 207 comment "Code generation options"
 208
 209 choice
 210         prompt "Processor type"
 211         default MARCH_G5
 212
 213 config MARCH_G5
 214         bool "S/390 model G5 and G6"
 215         depends on !64BIT
 216         help
 217           Select this to build a 31 bit kernel that works
 218           on all S/390 and zSeries machines.
 219
 220 config MARCH_Z900
 221         bool "IBM eServer zSeries model z800 and z900"
 222         help
 223           Select this to optimize for zSeries machines. This
 224           will enable some optimizations that are not available
 225           on older 31 bit only CPUs.
 226
 227 config MARCH_Z990
 228         bool "IBM eServer zSeries model z890 and z990"
 229         help
 230           Select this enable optimizations for model z890/z990.
 231           This will be slightly faster but does not work on
 232           older machines such as the z900.
 233
 234 config MARCH_Z9_109
 235         bool "IBM System z9"
 236         help
 237           Select this to enable optimizations for IBM System z9-109, IBM
 238           System z9 Enterprise Class (z9 EC), and IBM System z9 Business
 239           Class (z9 BC). The kernel will be slightly faster but will not
 240           work on older machines such as the z990, z890, z900, and z800.
 241
 242 config MARCH_Z10
 243         bool "IBM System z10"
 244         help
 245           Select this to enable optimizations for IBM System z10. The
 246           kernel will be slightly faster but will not work on older
 247           machines such as the z990, z890, z900, z800, z9-109, z9-ec
 248           and z9-bc.
 249
 250 endchoice
 251
 252 config PACK_STACK
 253         bool "Pack kernel stack"
 254         help
 255           This option enables the compiler option -mkernel-backchain if it
 256           is available. If the option is available the compiler supports
 257           the new stack layout which dramatically reduces the minimum stack
 258           frame size. With an old compiler a non-leaf function needs a
 259           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 260           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 261           and 24 byte on 64 bit.
 262
 263           Say Y if you are unsure.
 264
 265 config SMALL_STACK
 266         bool "Use 8kb for kernel stack instead of 16kb"
 267         depends on PACK_STACK && 64BIT && !LOCKDEP
 268         help
 269           If you say Y here and the compiler supports the -mkernel-backchain
 270           option the kernel will use a smaller kernel stack size. The reduced
 271           size is 8kb instead of 16kb. This allows to run more threads on a
 272           system and reduces the pressure on the memory management for higher
 273           order page allocations.
 274
 275           Say N if you are unsure.
 276
 277 config CHECK_STACK
 278         bool "Detect kernel stack overflow"
 279         help
 280           This option enables the compiler option -mstack-guard and
 281           -mstack-size if they are available. If the compiler supports them
 282           it will emit additional code to each function prolog to trigger
 283           an illegal operation if the kernel stack is about to overflow.
 284
 285           Say N if you are unsure.
 286
 287 config STACK_GUARD
 288         int "Size of the guard area (128-1024)"
 289         range 128 1024
 290         depends on CHECK_STACK
 291         default "256"
 292         help
 293           This allows you to specify the size of the guard area at the lower
 294           end of the kernel stack. If the kernel stack points into the guard
 295           area on function entry an illegal operation is triggered. The size
 296           needs to be a power of 2. Please keep in mind that the size of an
 297           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 298           The minimum size for the stack guard should be 256 for 31 bit and
 299           512 for 64 bit.
 300
 301 config WARN_STACK
 302         bool "Emit compiler warnings for function with broken stack usage"
 303         help
 304           This option enables the compiler options -mwarn-framesize and
 305           -mwarn-dynamicstack. If the compiler supports these options it
 306           will generate warnings for function which either use alloca or
 307           create a stack frame bigger than CONFIG_WARN_STACK_SIZE.
 308
 309           Say N if you are unsure.
 310
 311 config WARN_STACK_SIZE
 312         int "Maximum frame size considered safe (128-2048)"
 313         range 128 2048
 314         depends on WARN_STACK
 315         default "2048"
 316         help
 317           This allows you to specify the maximum frame size a function may
 318           have without the compiler complaining about it.
 319
 320 config ARCH_POPULATES_NODE_MAP
 321         def_bool y
 322
 323 comment "Kernel preemption"
 324
 325 source "kernel/Kconfig.preempt"
 326
 327 config ARCH_SPARSEMEM_ENABLE
 328         def_bool y
 329         select SPARSEMEM_VMEMMAP_ENABLE
 330         select SPARSEMEM_VMEMMAP
 331         select SPARSEMEM_STATIC if !64BIT
 332
 333 config ARCH_SPARSEMEM_DEFAULT
 334         def_bool y
 335
 336 config ARCH_SELECT_MEMORY_MODEL
 337        def_bool y
 338
 339 config ARCH_ENABLE_MEMORY_HOTPLUG
 340         def_bool y
 341         depends on SPARSEMEM
 342
 343 config ARCH_ENABLE_MEMORY_HOTREMOVE
 344         def_bool y
 345
 346 source "mm/Kconfig"
 347
 348 comment "I/O subsystem configuration"
 349
 350 config QDIO
 351         tristate "QDIO support"
 352         ---help---
 353           This driver provides the Queued Direct I/O base support for
 354           IBM System z.
 355
 356           To compile this driver as a module, choose M here: the
 357           module will be called qdio.
 358
 359           If unsure, say Y.
 360
 361 config CHSC_SCH
 362         tristate "Support for CHSC subchannels"
 363         help
 364           This driver allows usage of CHSC subchannels. A CHSC subchannel
 365           is usually present on LPAR only.
 366           The driver creates a device /dev/chsc, which may be used to
 367           obtain I/O configuration information about the machine and
 368           to issue asynchronous chsc commands (DANGEROUS).
 369           You will usually only want to use this interface on a special
 370           LPAR designated for system management.
 371
 372           To compile this driver as a module, choose M here: the
 373           module will be called chsc_sch.
 374
 375           If unsure, say N.
 376
 377 comment "Misc"
 378
 379 config IPL
 380         bool "Builtin IPL record support"
 381         help
 382           If you want to use the produced kernel to IPL directly from a
 383           device, you have to merge a bootsector specific to the device
 384           into the first bytes of the kernel. You will have to select the
 385           IPL device.
 386
 387 choice
 388         prompt "IPL method generated into head.S"
 389         depends on IPL
 390         default IPL_VM
 391         help
 392           Select "tape" if you want to IPL the image from a Tape.
 393
 394           Select "vm_reader" if you are running under VM/ESA and want
 395           to IPL the image from the emulated card reader.
 396
 397 config IPL_TAPE
 398         bool "tape"
 399
 400 config IPL_VM
 401         bool "vm_reader"
 402
 403 endchoice
 404
 405 source "fs/Kconfig.binfmt"
 406
 407 config FORCE_MAX_ZONEORDER
 408         int
 409         default "9"
 410
 411 config PROCESS_DEBUG
 412         bool "Show crashed user process info"
 413         help
 414           Say Y to print all process fault locations to the console.  This is
 415           a debugging option; you probably do not want to set it unless you
 416           are an S390 port maintainer.
 417
 418 config PFAULT
 419         bool "Pseudo page fault support"
 420         help
 421           Select this option, if you want to use PFAULT pseudo page fault
 422           handling under VM. If running native or in LPAR, this option
 423           has no effect. If your VM does not support PFAULT, PAGEEX
 424           pseudo page fault handling will be used.
 425           Note that VM 4.2 supports PFAULT but has a bug in its
 426           implementation that causes some problems.
 427           Everybody who wants to run Linux under VM != VM4.2 should select
 428           this option.
 429
 430 config SHARED_KERNEL
 431         bool "VM shared kernel support"
 432         help
 433           Select this option, if you want to share the text segment of the
 434           Linux kernel between different VM guests. This reduces memory
 435           usage with lots of guests but greatly increases kernel size.
 436           Also if a kernel was IPL'ed from a shared segment the kexec system
 437           call will not work.
 438           You should only select this option if you know what you are
 439           doing and want to exploit this feature.
 440
 441 config CMM
 442         tristate "Cooperative memory management"
 443         help
 444           Select this option, if you want to enable the kernel interface
 445           to reduce the memory size of the system. This is accomplished
 446           by allocating pages of memory and put them "on hold". This only
 447           makes sense for a system running under VM where the unused pages
 448           will be reused by VM for other guest systems. The interface
 449           allows an external monitor to balance memory of many systems.
 450           Everybody who wants to run Linux under VM should select this
 451           option.
 452
 453 config CMM_PROC
 454         bool "/proc interface to cooperative memory management"
 455         depends on CMM
 456         help
 457           Select this option to enable the /proc interface to the
 458           cooperative memory management.
 459
 460 config CMM_IUCV
 461         bool "IUCV special message interface to cooperative memory management"
 462         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 463         help
 464           Select this option to enable the special message interface to
 465           the cooperative memory management.
 466
 467 config PAGE_STATES
 468         bool "Unused page notification"
 469         help
 470           This enables the notification of unused pages to the
 471           hypervisor. The ESSA instruction is used to do the states
 472           changes between a page that has content and the unused state.
 473
 474 config APPLDATA_BASE
 475         bool "Linux - VM Monitor Stream, base infrastructure"
 476         depends on PROC_FS
 477         help
 478           This provides a kernel interface for creating and updating z/VM APPLDATA
 479           monitor records. The monitor records are updated at certain time
 480           intervals, once the timer is started.
 481           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 482           i.e. enables or disables monitoring on the Linux side.
 483           A custom interval value (in seconds) can be written to
 484           /proc/appldata/interval.
 485
 486           Defaults are 60 seconds interval and timer off.
 487           The /proc entries can also be read from, showing the current settings.
 488
 489 config APPLDATA_MEM
 490         tristate "Monitor memory management statistics"
 491         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 492         help
 493           This provides memory management related data to the Linux - VM Monitor
 494           Stream, like paging/swapping rate, memory utilisation, etc.
 495           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 496           APPLDATA monitor record, i.e. enables or disables monitoring this record
 497           on the z/VM side.
 498
 499           Default is disabled.
 500           The /proc entry can also be read from, showing the current settings.
 501
 502           This can also be compiled as a module, which will be called
 503           appldata_mem.o.
 504
 505 config APPLDATA_OS
 506         tristate "Monitor OS statistics"
 507         depends on APPLDATA_BASE
 508         help
 509           This provides OS related data to the Linux - VM Monitor Stream, like
 510           CPU utilisation, etc.
 511           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 512           APPLDATA monitor record, i.e. enables or disables monitoring this record
 513           on the z/VM side.
 514
 515           Default is disabled.
 516           This can also be compiled as a module, which will be called
 517           appldata_os.o.
 518
 519 config APPLDATA_NET_SUM
 520         tristate "Monitor overall network statistics"
 521         depends on APPLDATA_BASE && NET
 522         help
 523           This provides network related data to the Linux - VM Monitor Stream,
 524           currently there is only a total sum of network I/O statistics, no
 525           per-interface data.
 526           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 527           APPLDATA monitor record, i.e. enables or disables monitoring this record
 528           on the z/VM side.
 529
 530           Default is disabled.
 531           This can also be compiled as a module, which will be called
 532           appldata_net_sum.o.
 533
 534 source kernel/Kconfig.hz
 535
 536 config S390_HYPFS_FS
 537         bool "s390 hypervisor file system support"
 538         select SYS_HYPERVISOR
 539         default y
 540         help
 541           This is a virtual file system intended to provide accounting
 542           information in an s390 hypervisor environment.
 543
 544 config KEXEC
 545         bool "kexec system call"
 546         help
 547           kexec is a system call that implements the ability to shutdown your
 548           current kernel, and to start another kernel.  It is like a reboot
 549           but is independent of hardware/microcode support.
 550
 551 config ZFCPDUMP
 552         bool "zfcpdump support"
 553         select SMP
 554         default n
 555         help
 556           Select this option if you want to build an zfcpdump enabled kernel.
 557           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 558
 559 config S390_GUEST
 560 bool "s390 guest support for KVM (EXPERIMENTAL)"
 561         depends on 64BIT && EXPERIMENTAL
 562         select VIRTIO
 563         select VIRTIO_RING
 564         select VIRTIO_CONSOLE
 565         help
 566           Select this option if you want to run the kernel as a guest under
 567           the KVM hypervisor. This will add detection for KVM as well  as a
 568           virtio transport. If KVM is detected, the virtio console will be
 569           the default console.
 570 endmenu
 571
 572 source "net/Kconfig"
 573
 574 config PCMCIA
 575         def_bool n
 576
 577 config CCW
 578         def_bool y
 579
 580 source "drivers/Kconfig"
 581
 582 source "fs/Kconfig"
 583
 584 source "arch/s390/Kconfig.debug"
 585
 586 source "security/Kconfig"
 587
 588 source "crypto/Kconfig"
 589
 590 source "lib/Kconfig"
 591
 592 source "arch/s390/kvm/Kconfig"