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