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 mainmenu "Linux Kernel Configuration"
  76
  77 config S390
  78         def_bool y
  79         select USE_GENERIC_SMP_HELPERS if SMP
  80         select HAVE_SYSCALL_WRAPPERS
  81         select HAVE_FUNCTION_TRACER
  82         select HAVE_OPROFILE
  83         select HAVE_KPROBES
  84         select HAVE_KRETPROBES
  85         select HAVE_KVM if 64BIT
  86         select HAVE_ARCH_TRACEHOOK
  87         select INIT_ALL_POSSIBLE
  88
  89 source "init/Kconfig"
  90
  91 source "kernel/Kconfig.freezer"
  92
  93 menu "Base setup"
  94
  95 comment "Processor type and features"
  96
  97 source "kernel/time/Kconfig"
  98
  99 config 64BIT
 100         bool "64 bit kernel"
 101         help
 102           Select this option if you have a 64 bit IBM zSeries machine
 103           and want to use the 64 bit addressing mode.
 104
 105 config 32BIT
 106         bool
 107         default y if !64BIT
 108
 109 config SMP
 110         bool "Symmetric multi-processing support"
 111         ---help---
 112           This enables support for systems with more than one CPU. If you have
 113           a system with only one CPU, like most personal computers, say N. If
 114           you have a system with more than one CPU, say Y.
 115
 116           If you say N here, the kernel will run on single and multiprocessor
 117           machines, but will use only one CPU of a multiprocessor machine. If
 118           you say Y here, the kernel will run on many, but not all,
 119           singleprocessor machines. On a singleprocessor machine, the kernel
 120           will run faster if you say N here.
 121
 122           See also the SMP-HOWTO available at
 123           <http://www.tldp.org/docs.html#howto>.
 124
 125           Even if you don't know what to do here, say Y.
 126
 127 config NR_CPUS
 128         int "Maximum number of CPUs (2-64)"
 129         range 2 64
 130         depends on SMP
 131         default "32" if !64BIT
 132         default "64" if 64BIT
 133         help
 134           This allows you to specify the maximum number of CPUs which this
 135           kernel will support.  The maximum supported value is 64 and the
 136           minimum value which makes sense is 2.
 137
 138           This is purely to save memory - each supported CPU adds
 139           approximately sixteen kilobytes to the kernel image.
 140
 141 config HOTPLUG_CPU
 142         bool "Support for hot-pluggable CPUs"
 143         depends on SMP
 144         select HOTPLUG
 145         default n
 146         help
 147           Say Y here to be able to turn CPUs off and on. CPUs
 148           can be controlled through /sys/devices/system/cpu/cpu#.
 149           Say N if you want to disable CPU hotplug.
 150
 151 config MATHEMU
 152         bool "IEEE FPU emulation"
 153         depends on MARCH_G5
 154         help
 155           This option is required for IEEE compliant floating point arithmetic
 156           on older S/390 machines. Say Y unless you know your machine doesn't
 157           need this.
 158
 159 config COMPAT
 160         bool "Kernel support for 31 bit emulation"
 161         depends on 64BIT
 162         select COMPAT_BINFMT_ELF
 163         help
 164           Select this option if you want to enable your system kernel to
 165           handle system-calls from ELF binaries for 31 bit ESA.  This option
 166           (and some other stuff like libraries and such) is needed for
 167           executing 31 bit applications.  It is safe to say "Y".
 168
 169 config SYSVIPC_COMPAT
 170         bool
 171         depends on COMPAT && SYSVIPC
 172         default y
 173
 174 config AUDIT_ARCH
 175         bool
 176         default y
 177
 178 config S390_SWITCH_AMODE
 179         bool "Switch kernel/user addressing modes"
 180         help
 181           This option allows to switch the addressing modes of kernel and user
 182           space. The kernel parameter switch_amode=on will enable this feature,
 183           default is disabled. Enabling this (via kernel parameter) on machines
 184           earlier than IBM System z9-109 EC/BC will reduce system performance.
 185
 186           Note that this option will also be selected by selecting the execute
 187           protection option below. Enabling the execute protection via the
 188           noexec kernel parameter will also switch the addressing modes,
 189           independent of the switch_amode kernel parameter.
 190
 191
 192 config S390_EXEC_PROTECT
 193         bool "Data execute protection"
 194         select S390_SWITCH_AMODE
 195         help
 196           This option allows to enable a buffer overflow protection for user
 197           space programs and it also selects the addressing mode option above.
 198           The kernel parameter noexec=on will enable this feature and also
 199           switch the addressing modes, default is disabled. Enabling this (via
 200           kernel parameter) on machines earlier than IBM System z9-109 EC/BC
 201           will reduce system performance.
 202
 203 comment "Code generation options"
 204
 205 choice
 206         prompt "Processor type"
 207         default MARCH_G5
 208
 209 config MARCH_G5
 210         bool "S/390 model G5 and G6"
 211         depends on !64BIT
 212         help
 213           Select this to build a 31 bit kernel that works
 214           on all S/390 and zSeries machines.
 215
 216 config MARCH_Z900
 217         bool "IBM eServer zSeries model z800 and z900"
 218         help
 219           Select this to optimize for zSeries machines. This
 220           will enable some optimizations that are not available
 221           on older 31 bit only CPUs.
 222
 223 config MARCH_Z990
 224         bool "IBM eServer zSeries model z890 and z990"
 225         help
 226           Select this enable optimizations for model z890/z990.
 227           This will be slightly faster but does not work on
 228           older machines such as the z900.
 229
 230 config MARCH_Z9_109
 231         bool "IBM System z9"
 232         help
 233           Select this to enable optimizations for IBM System z9-109, IBM
 234           System z9 Enterprise Class (z9 EC), and IBM System z9 Business
 235           Class (z9 BC). The kernel will be slightly faster but will not
 236           work on older machines such as the z990, z890, z900, and z800.
 237
 238 config MARCH_Z10
 239         bool "IBM System z10"
 240         help
 241           Select this to enable optimizations for IBM System z10. The
 242           kernel will be slightly faster but will not work on older
 243           machines such as the z990, z890, z900, z800, z9-109, z9-ec
 244           and z9-bc.
 245
 246 endchoice
 247
 248 config PACK_STACK
 249         bool "Pack kernel stack"
 250         help
 251           This option enables the compiler option -mkernel-backchain if it
 252           is available. If the option is available the compiler supports
 253           the new stack layout which dramatically reduces the minimum stack
 254           frame size. With an old compiler a non-leaf function needs a
 255           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 256           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 257           and 24 byte on 64 bit.
 258
 259           Say Y if you are unsure.
 260
 261 config SMALL_STACK
 262         bool "Use 8kb for kernel stack instead of 16kb"
 263         depends on PACK_STACK && 64BIT && !LOCKDEP
 264         help
 265           If you say Y here and the compiler supports the -mkernel-backchain
 266           option the kernel will use a smaller kernel stack size. The reduced
 267           size is 8kb instead of 16kb. This allows to run more threads on a
 268           system and reduces the pressure on the memory management for higher
 269           order page allocations.
 270
 271           Say N if you are unsure.
 272
 273 config CHECK_STACK
 274         bool "Detect kernel stack overflow"
 275         help
 276           This option enables the compiler option -mstack-guard and
 277           -mstack-size if they are available. If the compiler supports them
 278           it will emit additional code to each function prolog to trigger
 279           an illegal operation if the kernel stack is about to overflow.
 280
 281           Say N if you are unsure.
 282
 283 config STACK_GUARD
 284         int "Size of the guard area (128-1024)"
 285         range 128 1024
 286         depends on CHECK_STACK
 287         default "256"
 288         help
 289           This allows you to specify the size of the guard area at the lower
 290           end of the kernel stack. If the kernel stack points into the guard
 291           area on function entry an illegal operation is triggered. The size
 292           needs to be a power of 2. Please keep in mind that the size of an
 293           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 294           The minimum size for the stack guard should be 256 for 31 bit and
 295           512 for 64 bit.
 296
 297 config WARN_STACK
 298         bool "Emit compiler warnings for function with broken stack usage"
 299         help
 300           This option enables the compiler options -mwarn-framesize and
 301           -mwarn-dynamicstack. If the compiler supports these options it
 302           will generate warnings for function which either use alloca or
 303           create a stack frame bigger than CONFIG_WARN_STACK_SIZE.
 304
 305           Say N if you are unsure.
 306
 307 config WARN_STACK_SIZE
 308         int "Maximum frame size considered safe (128-2048)"
 309         range 128 2048
 310         depends on WARN_STACK
 311         default "2048"
 312         help
 313           This allows you to specify the maximum frame size a function may
 314           have without the compiler complaining about it.
 315
 316 config ARCH_POPULATES_NODE_MAP
 317         def_bool y
 318
 319 comment "Kernel preemption"
 320
 321 source "kernel/Kconfig.preempt"
 322
 323 config ARCH_SPARSEMEM_ENABLE
 324         def_bool y
 325         select SPARSEMEM_VMEMMAP_ENABLE
 326         select SPARSEMEM_VMEMMAP
 327         select SPARSEMEM_STATIC if !64BIT
 328
 329 config ARCH_SPARSEMEM_DEFAULT
 330         def_bool y
 331
 332 config ARCH_SELECT_MEMORY_MODEL
 333        def_bool y
 334
 335 config ARCH_ENABLE_MEMORY_HOTPLUG
 336         def_bool y
 337         depends on SPARSEMEM
 338
 339 config ARCH_ENABLE_MEMORY_HOTREMOVE
 340         def_bool y
 341
 342 source "mm/Kconfig"
 343
 344 comment "I/O subsystem configuration"
 345
 346 config MACHCHK_WARNING
 347         bool "Process warning machine checks"
 348         help
 349           Select this option if you want the machine check handler on IBM S/390 or
 350           zSeries to process warning machine checks (e.g. on power failures).
 351           If unsure, say "Y".
 352
 353 config QDIO
 354         tristate "QDIO support"
 355         ---help---
 356           This driver provides the Queued Direct I/O base support for
 357           IBM System z.
 358
 359           To compile this driver as a module, choose M here: the
 360           module will be called qdio.
 361
 362           If unsure, say Y.
 363
 364 config CHSC_SCH
 365         tristate "Support for CHSC subchannels"
 366         help
 367           This driver allows usage of CHSC subchannels. A CHSC subchannel
 368           is usually present on LPAR only.
 369           The driver creates a device /dev/chsc, which may be used to
 370           obtain I/O configuration information about the machine and
 371           to issue asynchronous chsc commands (DANGEROUS).
 372           You will usually only want to use this interface on a special
 373           LPAR designated for system management.
 374
 375           To compile this driver as a module, choose M here: the
 376           module will be called chsc_sch.
 377
 378           If unsure, say N.
 379
 380 comment "Misc"
 381
 382 config IPL
 383         bool "Builtin IPL record support"
 384         help
 385           If you want to use the produced kernel to IPL directly from a
 386           device, you have to merge a bootsector specific to the device
 387           into the first bytes of the kernel. You will have to select the
 388           IPL device.
 389
 390 choice
 391         prompt "IPL method generated into head.S"
 392         depends on IPL
 393         default IPL_VM
 394         help
 395           Select "tape" if you want to IPL the image from a Tape.
 396
 397           Select "vm_reader" if you are running under VM/ESA and want
 398           to IPL the image from the emulated card reader.
 399
 400 config IPL_TAPE
 401         bool "tape"
 402
 403 config IPL_VM
 404         bool "vm_reader"
 405
 406 endchoice
 407
 408 source "fs/Kconfig.binfmt"
 409
 410 config FORCE_MAX_ZONEORDER
 411         int
 412         default "9"
 413
 414 config PROCESS_DEBUG
 415         bool "Show crashed user process info"
 416         help
 417           Say Y to print all process fault locations to the console.  This is
 418           a debugging option; you probably do not want to set it unless you
 419           are an S390 port maintainer.
 420
 421 config PFAULT
 422         bool "Pseudo page fault support"
 423         help
 424           Select this option, if you want to use PFAULT pseudo page fault
 425           handling under VM. If running native or in LPAR, this option
 426           has no effect. If your VM does not support PFAULT, PAGEEX
 427           pseudo page fault handling will be used.
 428           Note that VM 4.2 supports PFAULT but has a bug in its
 429           implementation that causes some problems.
 430           Everybody who wants to run Linux under VM != VM4.2 should select
 431           this option.
 432
 433 config SHARED_KERNEL
 434         bool "VM shared kernel support"
 435         help
 436           Select this option, if you want to share the text segment of the
 437           Linux kernel between different VM guests. This reduces memory
 438           usage with lots of guests but greatly increases kernel size.
 439           Also if a kernel was IPL'ed from a shared segment the kexec system
 440           call will not work.
 441           You should only select this option if you know what you are
 442           doing and want to exploit this feature.
 443
 444 config CMM
 445         tristate "Cooperative memory management"
 446         help
 447           Select this option, if you want to enable the kernel interface
 448           to reduce the memory size of the system. This is accomplished
 449           by allocating pages of memory and put them "on hold". This only
 450           makes sense for a system running under VM where the unused pages
 451           will be reused by VM for other guest systems. The interface
 452           allows an external monitor to balance memory of many systems.
 453           Everybody who wants to run Linux under VM should select this
 454           option.
 455
 456 config CMM_PROC
 457         bool "/proc interface to cooperative memory management"
 458         depends on CMM
 459         help
 460           Select this option to enable the /proc interface to the
 461           cooperative memory management.
 462
 463 config CMM_IUCV
 464         bool "IUCV special message interface to cooperative memory management"
 465         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 466         help
 467           Select this option to enable the special message interface to
 468           the cooperative memory management.
 469
 470 config PAGE_STATES
 471         bool "Unused page notification"
 472         help
 473           This enables the notification of unused pages to the
 474           hypervisor. The ESSA instruction is used to do the states
 475           changes between a page that has content and the unused state.
 476
 477 config APPLDATA_BASE
 478         bool "Linux - VM Monitor Stream, base infrastructure"
 479         depends on PROC_FS
 480         help
 481           This provides a kernel interface for creating and updating z/VM APPLDATA
 482           monitor records. The monitor records are updated at certain time
 483           intervals, once the timer is started.
 484           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 485           i.e. enables or disables monitoring on the Linux side.
 486           A custom interval value (in seconds) can be written to
 487           /proc/appldata/interval.
 488
 489           Defaults are 60 seconds interval and timer off.
 490           The /proc entries can also be read from, showing the current settings.
 491
 492 config APPLDATA_MEM
 493         tristate "Monitor memory management statistics"
 494         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 495         help
 496           This provides memory management related data to the Linux - VM Monitor
 497           Stream, like paging/swapping rate, memory utilisation, etc.
 498           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 499           APPLDATA monitor record, i.e. enables or disables monitoring this record
 500           on the z/VM side.
 501
 502           Default is disabled.
 503           The /proc entry can also be read from, showing the current settings.
 504
 505           This can also be compiled as a module, which will be called
 506           appldata_mem.o.
 507
 508 config APPLDATA_OS
 509         tristate "Monitor OS statistics"
 510         depends on APPLDATA_BASE
 511         help
 512           This provides OS related data to the Linux - VM Monitor Stream, like
 513           CPU utilisation, etc.
 514           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 515           APPLDATA monitor record, i.e. enables or disables monitoring this record
 516           on the z/VM side.
 517
 518           Default is disabled.
 519           This can also be compiled as a module, which will be called
 520           appldata_os.o.
 521
 522 config APPLDATA_NET_SUM
 523         tristate "Monitor overall network statistics"
 524         depends on APPLDATA_BASE
 525         help
 526           This provides network related data to the Linux - VM Monitor Stream,
 527           currently there is only a total sum of network I/O statistics, no
 528           per-interface data.
 529           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 530           APPLDATA monitor record, i.e. enables or disables monitoring this record
 531           on the z/VM side.
 532
 533           Default is disabled.
 534           This can also be compiled as a module, which will be called
 535           appldata_net_sum.o.
 536
 537 source kernel/Kconfig.hz
 538
 539 config S390_HYPFS_FS
 540         bool "s390 hypervisor file system support"
 541         select SYS_HYPERVISOR
 542         default y
 543         help
 544           This is a virtual file system intended to provide accounting
 545           information in an s390 hypervisor environment.
 546
 547 config KEXEC
 548         bool "kexec system call"
 549         help
 550           kexec is a system call that implements the ability to shutdown your
 551           current kernel, and to start another kernel.  It is like a reboot
 552           but is independent of hardware/microcode support.
 553
 554 config ZFCPDUMP
 555         tristate "zfcpdump support"
 556         select SMP
 557         default n
 558         help
 559           Select this option if you want to build an zfcpdump enabled kernel.
 560           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 561
 562 config S390_GUEST
 563 bool "s390 guest support for KVM (EXPERIMENTAL)"
 564         depends on 64BIT && EXPERIMENTAL
 565         select VIRTIO
 566         select VIRTIO_RING
 567         select VIRTIO_CONSOLE
 568         help
 569           Select this option if you want to run the kernel as a guest under
 570           the KVM hypervisor. This will add detection for KVM as well  as a
 571           virtio transport. If KVM is detected, the virtio console will be
 572           the default console.
 573 endmenu
 574
 575 source "net/Kconfig"
 576
 577 config PCMCIA
 578         def_bool n
 579
 580 config CCW
 581         def_bool y
 582
 583 source "drivers/Kconfig"
 584
 585 source "fs/Kconfig"
 586
 587 source "arch/s390/Kconfig.debug"
 588
 589 source "security/Kconfig"
 590
 591 source "crypto/Kconfig"
 592
 593 source "lib/Kconfig"
 594
 595 source "arch/s390/kvm/Kconfig"