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 GENERIC_BUG_RELATIVE_POINTERS
  58         def_bool y
  59
  60 config NO_IOMEM
  61         def_bool y
  62
  63 config NO_DMA
  64         def_bool y
  65
  66 config GENERIC_LOCKBREAK
  67         bool
  68         default y
  69         depends on SMP && PREEMPT
  70
  71 config PGSTE
  72         bool
  73         default y if KVM
  74
  75 config VIRT_CPU_ACCOUNTING
  76         def_bool y
  77
  78 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  79         def_bool y
  80
  81 mainmenu "Linux Kernel Configuration"
  82
  83 config S390
  84         def_bool y
  85         select USE_GENERIC_SMP_HELPERS if SMP
  86         select HAVE_SYSCALL_WRAPPERS
  87         select HAVE_FUNCTION_TRACER
  88         select HAVE_FUNCTION_TRACE_MCOUNT_TEST
  89         select HAVE_FTRACE_MCOUNT_RECORD
  90         select HAVE_SYSCALL_TRACEPOINTS
  91         select HAVE_DYNAMIC_FTRACE
  92         select HAVE_FUNCTION_GRAPH_TRACER
  93         select HAVE_DEFAULT_NO_SPIN_MUTEXES
  94         select HAVE_OPROFILE
  95         select HAVE_KPROBES
  96         select HAVE_KRETPROBES
  97         select HAVE_KVM if 64BIT
  98         select HAVE_ARCH_TRACEHOOK
  99         select INIT_ALL_POSSIBLE
 100         select HAVE_PERF_EVENTS
 101         select ARCH_INLINE_SPIN_TRYLOCK
 102         select ARCH_INLINE_SPIN_TRYLOCK_BH
 103         select ARCH_INLINE_SPIN_LOCK
 104         select ARCH_INLINE_SPIN_LOCK_BH
 105         select ARCH_INLINE_SPIN_LOCK_IRQ
 106         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
 107         select ARCH_INLINE_SPIN_UNLOCK
 108         select ARCH_INLINE_SPIN_UNLOCK_BH
 109         select ARCH_INLINE_SPIN_UNLOCK_IRQ
 110         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
 111         select ARCH_INLINE_READ_TRYLOCK
 112         select ARCH_INLINE_READ_LOCK
 113         select ARCH_INLINE_READ_LOCK_BH
 114         select ARCH_INLINE_READ_LOCK_IRQ
 115         select ARCH_INLINE_READ_LOCK_IRQSAVE
 116         select ARCH_INLINE_READ_UNLOCK
 117         select ARCH_INLINE_READ_UNLOCK_BH
 118         select ARCH_INLINE_READ_UNLOCK_IRQ
 119         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
 120         select ARCH_INLINE_WRITE_TRYLOCK
 121         select ARCH_INLINE_WRITE_LOCK
 122         select ARCH_INLINE_WRITE_LOCK_BH
 123         select ARCH_INLINE_WRITE_LOCK_IRQ
 124         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 125         select ARCH_INLINE_WRITE_UNLOCK
 126         select ARCH_INLINE_WRITE_UNLOCK_BH
 127         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 128         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 129
 130 config SCHED_OMIT_FRAME_POINTER
 131         bool
 132         default y
 133
 134 source "init/Kconfig"
 135
 136 source "kernel/Kconfig.freezer"
 137
 138 menu "Base setup"
 139
 140 comment "Processor type and features"
 141
 142 source "kernel/time/Kconfig"
 143
 144 config 64BIT
 145         bool "64 bit kernel"
 146         help
 147           Select this option if you have a 64 bit IBM zSeries machine
 148           and want to use the 64 bit addressing mode.
 149
 150 config 32BIT
 151         bool
 152         default y if !64BIT
 153
 154 config KTIME_SCALAR
 155         def_bool 32BIT
 156
 157 config SMP
 158         bool "Symmetric multi-processing support"
 159         ---help---
 160           This enables support for systems with more than one CPU. If you have
 161           a system with only one CPU, like most personal computers, say N. If
 162           you have a system with more than one CPU, say Y.
 163
 164           If you say N here, the kernel will run on single and multiprocessor
 165           machines, but will use only one CPU of a multiprocessor machine. If
 166           you say Y here, the kernel will run on many, but not all,
 167           singleprocessor machines. On a singleprocessor machine, the kernel
 168           will run faster if you say N here.
 169
 170           See also the SMP-HOWTO available at
 171           <http://www.tldp.org/docs.html#howto>.
 172
 173           Even if you don't know what to do here, say Y.
 174
 175 config NR_CPUS
 176         int "Maximum number of CPUs (2-64)"
 177         range 2 64
 178         depends on SMP
 179         default "32" if !64BIT
 180         default "64" if 64BIT
 181         help
 182           This allows you to specify the maximum number of CPUs which this
 183           kernel will support.  The maximum supported value is 64 and the
 184           minimum value which makes sense is 2.
 185
 186           This is purely to save memory - each supported CPU adds
 187           approximately sixteen kilobytes to the kernel image.
 188
 189 config HOTPLUG_CPU
 190         bool "Support for hot-pluggable CPUs"
 191         depends on SMP
 192         select HOTPLUG
 193         default n
 194         help
 195           Say Y here to be able to turn CPUs off and on. CPUs
 196           can be controlled through /sys/devices/system/cpu/cpu#.
 197           Say N if you want to disable CPU hotplug.
 198
 199 config MATHEMU
 200         bool "IEEE FPU emulation"
 201         depends on MARCH_G5
 202         help
 203           This option is required for IEEE compliant floating point arithmetic
 204           on older S/390 machines. Say Y unless you know your machine doesn't
 205           need this.
 206
 207 config COMPAT
 208         bool "Kernel support for 31 bit emulation"
 209         depends on 64BIT
 210         select COMPAT_BINFMT_ELF
 211         help
 212           Select this option if you want to enable your system kernel to
 213           handle system-calls from ELF binaries for 31 bit ESA.  This option
 214           (and some other stuff like libraries and such) is needed for
 215           executing 31 bit applications.  It is safe to say "Y".
 216
 217 config SYSVIPC_COMPAT
 218         bool
 219         depends on COMPAT && SYSVIPC
 220         default y
 221
 222 config AUDIT_ARCH
 223         bool
 224         default y
 225
 226 config S390_EXEC_PROTECT
 227         bool "Data execute protection"
 228         help
 229           This option allows to enable a buffer overflow protection for user
 230           space programs and it also selects the addressing mode option above.
 231           The kernel parameter noexec=on will enable this feature and also
 232           switch the addressing modes, default is disabled. Enabling this (via
 233           kernel parameter) on machines earlier than IBM System z9-109 EC/BC
 234           will reduce system performance.
 235
 236 comment "Code generation options"
 237
 238 choice
 239         prompt "Processor type"
 240         default MARCH_G5
 241
 242 config MARCH_G5
 243         bool "S/390 model G5 and G6"
 244         depends on !64BIT
 245         help
 246           Select this to build a 31 bit kernel that works
 247           on all S/390 and zSeries machines.
 248
 249 config MARCH_Z900
 250         bool "IBM eServer zSeries model z800 and z900"
 251         help
 252           Select this to optimize for zSeries machines. This
 253           will enable some optimizations that are not available
 254           on older 31 bit only CPUs.
 255
 256 config MARCH_Z990
 257         bool "IBM eServer zSeries model z890 and z990"
 258         help
 259           Select this enable optimizations for model z890/z990.
 260           This will be slightly faster but does not work on
 261           older machines such as the z900.
 262
 263 config MARCH_Z9_109
 264         bool "IBM System z9"
 265         help
 266           Select this to enable optimizations for IBM System z9-109, IBM
 267           System z9 Enterprise Class (z9 EC), and IBM System z9 Business
 268           Class (z9 BC). The kernel will be slightly faster but will not
 269           work on older machines such as the z990, z890, z900, and z800.
 270
 271 config MARCH_Z10
 272         bool "IBM System z10"
 273         help
 274           Select this to enable optimizations for IBM System z10. The
 275           kernel will be slightly faster but will not work on older
 276           machines such as the z990, z890, z900, z800, z9-109, z9-ec
 277           and z9-bc.
 278
 279 endchoice
 280
 281 config PACK_STACK
 282         bool "Pack kernel stack"
 283         help
 284           This option enables the compiler option -mkernel-backchain if it
 285           is available. If the option is available the compiler supports
 286           the new stack layout which dramatically reduces the minimum stack
 287           frame size. With an old compiler a non-leaf function needs a
 288           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 289           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 290           and 24 byte on 64 bit.
 291
 292           Say Y if you are unsure.
 293
 294 config SMALL_STACK
 295         bool "Use 8kb for kernel stack instead of 16kb"
 296         depends on PACK_STACK && 64BIT && !LOCKDEP
 297         help
 298           If you say Y here and the compiler supports the -mkernel-backchain
 299           option the kernel will use a smaller kernel stack size. The reduced
 300           size is 8kb instead of 16kb. This allows to run more threads on a
 301           system and reduces the pressure on the memory management for higher
 302           order page allocations.
 303
 304           Say N if you are unsure.
 305
 306 config CHECK_STACK
 307         bool "Detect kernel stack overflow"
 308         help
 309           This option enables the compiler option -mstack-guard and
 310           -mstack-size if they are available. If the compiler supports them
 311           it will emit additional code to each function prolog to trigger
 312           an illegal operation if the kernel stack is about to overflow.
 313
 314           Say N if you are unsure.
 315
 316 config STACK_GUARD
 317         int "Size of the guard area (128-1024)"
 318         range 128 1024
 319         depends on CHECK_STACK
 320         default "256"
 321         help
 322           This allows you to specify the size of the guard area at the lower
 323           end of the kernel stack. If the kernel stack points into the guard
 324           area on function entry an illegal operation is triggered. The size
 325           needs to be a power of 2. Please keep in mind that the size of an
 326           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 327           The minimum size for the stack guard should be 256 for 31 bit and
 328           512 for 64 bit.
 329
 330 config WARN_STACK
 331         bool "Emit compiler warnings for function with broken stack usage"
 332         help
 333           This option enables the compiler options -mwarn-framesize and
 334           -mwarn-dynamicstack. If the compiler supports these options it
 335           will generate warnings for function which either use alloca or
 336           create a stack frame bigger than CONFIG_WARN_STACK_SIZE.
 337
 338           Say N if you are unsure.
 339
 340 config WARN_STACK_SIZE
 341         int "Maximum frame size considered safe (128-2048)"
 342         range 128 2048
 343         depends on WARN_STACK
 344         default "2048"
 345         help
 346           This allows you to specify the maximum frame size a function may
 347           have without the compiler complaining about it.
 348
 349 config ARCH_POPULATES_NODE_MAP
 350         def_bool y
 351
 352 comment "Kernel preemption"
 353
 354 source "kernel/Kconfig.preempt"
 355
 356 config ARCH_SPARSEMEM_ENABLE
 357         def_bool y
 358         select SPARSEMEM_VMEMMAP_ENABLE
 359         select SPARSEMEM_VMEMMAP
 360         select SPARSEMEM_STATIC if !64BIT
 361
 362 config ARCH_SPARSEMEM_DEFAULT
 363         def_bool y
 364
 365 config ARCH_SELECT_MEMORY_MODEL
 366        def_bool y
 367
 368 config ARCH_ENABLE_MEMORY_HOTPLUG
 369         def_bool y
 370         depends on SPARSEMEM
 371
 372 config ARCH_ENABLE_MEMORY_HOTREMOVE
 373         def_bool y
 374
 375 config ARCH_HIBERNATION_POSSIBLE
 376        def_bool y if 64BIT
 377
 378 source "mm/Kconfig"
 379
 380 comment "I/O subsystem configuration"
 381
 382 config QDIO
 383         tristate "QDIO support"
 384         ---help---
 385           This driver provides the Queued Direct I/O base support for
 386           IBM System z.
 387
 388           To compile this driver as a module, choose M here: the
 389           module will be called qdio.
 390
 391           If unsure, say Y.
 392
 393 config CHSC_SCH
 394         tristate "Support for CHSC subchannels"
 395         help
 396           This driver allows usage of CHSC subchannels. A CHSC subchannel
 397           is usually present on LPAR only.
 398           The driver creates a device /dev/chsc, which may be used to
 399           obtain I/O configuration information about the machine and
 400           to issue asynchronous chsc commands (DANGEROUS).
 401           You will usually only want to use this interface on a special
 402           LPAR designated for system management.
 403
 404           To compile this driver as a module, choose M here: the
 405           module will be called chsc_sch.
 406
 407           If unsure, say N.
 408
 409 comment "Misc"
 410
 411 config IPL
 412         bool "Builtin IPL record support"
 413         help
 414           If you want to use the produced kernel to IPL directly from a
 415           device, you have to merge a bootsector specific to the device
 416           into the first bytes of the kernel. You will have to select the
 417           IPL device.
 418
 419 choice
 420         prompt "IPL method generated into head.S"
 421         depends on IPL
 422         default IPL_VM
 423         help
 424           Select "tape" if you want to IPL the image from a Tape.
 425
 426           Select "vm_reader" if you are running under VM/ESA and want
 427           to IPL the image from the emulated card reader.
 428
 429 config IPL_TAPE
 430         bool "tape"
 431
 432 config IPL_VM
 433         bool "vm_reader"
 434
 435 endchoice
 436
 437 source "fs/Kconfig.binfmt"
 438
 439 config FORCE_MAX_ZONEORDER
 440         int
 441         default "9"
 442
 443 config PROCESS_DEBUG
 444         bool "Show crashed user process info"
 445         help
 446           Say Y to print all process fault locations to the console.  This is
 447           a debugging option; you probably do not want to set it unless you
 448           are an S390 port maintainer.
 449
 450 config PFAULT
 451         bool "Pseudo page fault support"
 452         help
 453           Select this option, if you want to use PFAULT pseudo page fault
 454           handling under VM. If running native or in LPAR, this option
 455           has no effect. If your VM does not support PFAULT, PAGEEX
 456           pseudo page fault handling will be used.
 457           Note that VM 4.2 supports PFAULT but has a bug in its
 458           implementation that causes some problems.
 459           Everybody who wants to run Linux under VM != VM4.2 should select
 460           this option.
 461
 462 config SHARED_KERNEL
 463         bool "VM shared kernel support"
 464         help
 465           Select this option, if you want to share the text segment of the
 466           Linux kernel between different VM guests. This reduces memory
 467           usage with lots of guests but greatly increases kernel size.
 468           Also if a kernel was IPL'ed from a shared segment the kexec system
 469           call will not work.
 470           You should only select this option if you know what you are
 471           doing and want to exploit this feature.
 472
 473 config CMM
 474         tristate "Cooperative memory management"
 475         help
 476           Select this option, if you want to enable the kernel interface
 477           to reduce the memory size of the system. This is accomplished
 478           by allocating pages of memory and put them "on hold". This only
 479           makes sense for a system running under VM where the unused pages
 480           will be reused by VM for other guest systems. The interface
 481           allows an external monitor to balance memory of many systems.
 482           Everybody who wants to run Linux under VM should select this
 483           option.
 484
 485 config CMM_PROC
 486         bool "/proc interface to cooperative memory management"
 487         depends on CMM
 488         help
 489           Select this option to enable the /proc interface to the
 490           cooperative memory management.
 491
 492 config CMM_IUCV
 493         bool "IUCV special message interface to cooperative memory management"
 494         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 495         help
 496           Select this option to enable the special message interface to
 497           the cooperative memory management.
 498
 499 config APPLDATA_BASE
 500         bool "Linux - VM Monitor Stream, base infrastructure"
 501         depends on PROC_FS
 502         help
 503           This provides a kernel interface for creating and updating z/VM APPLDATA
 504           monitor records. The monitor records are updated at certain time
 505           intervals, once the timer is started.
 506           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 507           i.e. enables or disables monitoring on the Linux side.
 508           A custom interval value (in seconds) can be written to
 509           /proc/appldata/interval.
 510
 511           Defaults are 60 seconds interval and timer off.
 512           The /proc entries can also be read from, showing the current settings.
 513
 514 config APPLDATA_MEM
 515         tristate "Monitor memory management statistics"
 516         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 517         help
 518           This provides memory management related data to the Linux - VM Monitor
 519           Stream, like paging/swapping rate, memory utilisation, etc.
 520           Writing 1 or 0 to /proc/appldata/memory 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           The /proc entry can also be read from, showing the current settings.
 526
 527           This can also be compiled as a module, which will be called
 528           appldata_mem.o.
 529
 530 config APPLDATA_OS
 531         tristate "Monitor OS statistics"
 532         depends on APPLDATA_BASE
 533         help
 534           This provides OS related data to the Linux - VM Monitor Stream, like
 535           CPU utilisation, etc.
 536           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 537           APPLDATA monitor record, i.e. enables or disables monitoring this record
 538           on the z/VM side.
 539
 540           Default is disabled.
 541           This can also be compiled as a module, which will be called
 542           appldata_os.o.
 543
 544 config APPLDATA_NET_SUM
 545         tristate "Monitor overall network statistics"
 546         depends on APPLDATA_BASE && NET
 547         help
 548           This provides network related data to the Linux - VM Monitor Stream,
 549           currently there is only a total sum of network I/O statistics, no
 550           per-interface data.
 551           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 552           APPLDATA monitor record, i.e. enables or disables monitoring this record
 553           on the z/VM side.
 554
 555           Default is disabled.
 556           This can also be compiled as a module, which will be called
 557           appldata_net_sum.o.
 558
 559 source kernel/Kconfig.hz
 560
 561 config S390_HYPFS_FS
 562         bool "s390 hypervisor file system support"
 563         select SYS_HYPERVISOR
 564         default y
 565         help
 566           This is a virtual file system intended to provide accounting
 567           information in an s390 hypervisor environment.
 568
 569 config KEXEC
 570         bool "kexec system call"
 571         help
 572           kexec is a system call that implements the ability to shutdown your
 573           current kernel, and to start another kernel.  It is like a reboot
 574           but is independent of hardware/microcode support.
 575
 576 config ZFCPDUMP
 577         bool "zfcpdump support"
 578         select SMP
 579         default n
 580         help
 581           Select this option if you want to build an zfcpdump enabled kernel.
 582           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 583
 584 config S390_GUEST
 585 bool "s390 guest support for KVM (EXPERIMENTAL)"
 586         depends on 64BIT && EXPERIMENTAL
 587         select VIRTIO
 588         select VIRTIO_RING
 589         select VIRTIO_CONSOLE
 590         help
 591           Select this option if you want to run the kernel as a guest under
 592           the KVM hypervisor. This will add detection for KVM as well  as a
 593           virtio transport. If KVM is detected, the virtio console will be
 594           the default console.
 595
 596 config SECCOMP
 597         bool "Enable seccomp to safely compute untrusted bytecode"
 598         depends on PROC_FS
 599         default y
 600         help
 601           This kernel feature is useful for number crunching applications
 602           that may need to compute untrusted bytecode during their
 603           execution. By using pipes or other transports made available to
 604           the process as file descriptors supporting the read/write
 605           syscalls, it's possible to isolate those applications in
 606           their own address space using seccomp. Once seccomp is
 607           enabled via /proc/<pid>/seccomp, it cannot be disabled
 608           and the task is only allowed to execute a few safe syscalls
 609           defined by each seccomp mode.
 610
 611           If unsure, say Y.
 612
 613 endmenu
 614
 615 menu "Power Management"
 616
 617 source "kernel/power/Kconfig"
 618
 619 endmenu
 620
 621 source "net/Kconfig"
 622
 623 config PCMCIA
 624         def_bool n
 625
 626 config CCW
 627         def_bool y
 628
 629 source "drivers/Kconfig"
 630
 631 source "fs/Kconfig"
 632
 633 source "arch/s390/Kconfig.debug"
 634
 635 source "security/Kconfig"
 636
 637 source "crypto/Kconfig"
 638
 639 source "lib/Kconfig"
 640
 641 source "arch/s390/kvm/Kconfig"