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_REGS_AND_STACK_ACCESS_API
  94         select HAVE_DEFAULT_NO_SPIN_MUTEXES
  95         select HAVE_OPROFILE
  96         select HAVE_KPROBES
  97         select HAVE_KRETPROBES
  98         select HAVE_KVM if 64BIT
  99         select HAVE_ARCH_TRACEHOOK
 100         select INIT_ALL_POSSIBLE
 101         select HAVE_PERF_EVENTS
 102         select HAVE_KERNEL_GZIP
 103         select HAVE_KERNEL_BZIP2
 104         select HAVE_KERNEL_LZMA
 105         select ARCH_INLINE_SPIN_TRYLOCK
 106         select ARCH_INLINE_SPIN_TRYLOCK_BH
 107         select ARCH_INLINE_SPIN_LOCK
 108         select ARCH_INLINE_SPIN_LOCK_BH
 109         select ARCH_INLINE_SPIN_LOCK_IRQ
 110         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
 111         select ARCH_INLINE_SPIN_UNLOCK
 112         select ARCH_INLINE_SPIN_UNLOCK_BH
 113         select ARCH_INLINE_SPIN_UNLOCK_IRQ
 114         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
 115         select ARCH_INLINE_READ_TRYLOCK
 116         select ARCH_INLINE_READ_LOCK
 117         select ARCH_INLINE_READ_LOCK_BH
 118         select ARCH_INLINE_READ_LOCK_IRQ
 119         select ARCH_INLINE_READ_LOCK_IRQSAVE
 120         select ARCH_INLINE_READ_UNLOCK
 121         select ARCH_INLINE_READ_UNLOCK_BH
 122         select ARCH_INLINE_READ_UNLOCK_IRQ
 123         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
 124         select ARCH_INLINE_WRITE_TRYLOCK
 125         select ARCH_INLINE_WRITE_LOCK
 126         select ARCH_INLINE_WRITE_LOCK_BH
 127         select ARCH_INLINE_WRITE_LOCK_IRQ
 128         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 129         select ARCH_INLINE_WRITE_UNLOCK
 130         select ARCH_INLINE_WRITE_UNLOCK_BH
 131         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 132         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 133
 134 config SCHED_OMIT_FRAME_POINTER
 135         bool
 136         default y
 137
 138 source "init/Kconfig"
 139
 140 source "kernel/Kconfig.freezer"
 141
 142 menu "Base setup"
 143
 144 comment "Processor type and features"
 145
 146 source "kernel/time/Kconfig"
 147
 148 config 64BIT
 149         bool "64 bit kernel"
 150         help
 151           Select this option if you have a 64 bit IBM zSeries machine
 152           and want to use the 64 bit addressing mode.
 153
 154 config 32BIT
 155         bool
 156         default y if !64BIT
 157
 158 config KTIME_SCALAR
 159         def_bool 32BIT
 160
 161 config SMP
 162         bool "Symmetric multi-processing support"
 163         ---help---
 164           This enables support for systems with more than one CPU. If you have
 165           a system with only one CPU, like most personal computers, say N. If
 166           you have a system with more than one CPU, say Y.
 167
 168           If you say N here, the kernel will run on single and multiprocessor
 169           machines, but will use only one CPU of a multiprocessor machine. If
 170           you say Y here, the kernel will run on many, but not all,
 171           singleprocessor machines. On a singleprocessor machine, the kernel
 172           will run faster if you say N here.
 173
 174           See also the SMP-HOWTO available at
 175           <http://www.tldp.org/docs.html#howto>.
 176
 177           Even if you don't know what to do here, say Y.
 178
 179 config NR_CPUS
 180         int "Maximum number of CPUs (2-64)"
 181         range 2 64
 182         depends on SMP
 183         default "32" if !64BIT
 184         default "64" if 64BIT
 185         help
 186           This allows you to specify the maximum number of CPUs which this
 187           kernel will support.  The maximum supported value is 64 and the
 188           minimum value which makes sense is 2.
 189
 190           This is purely to save memory - each supported CPU adds
 191           approximately sixteen kilobytes to the kernel image.
 192
 193 config HOTPLUG_CPU
 194         bool "Support for hot-pluggable CPUs"
 195         depends on SMP
 196         select HOTPLUG
 197         default n
 198         help
 199           Say Y here to be able to turn CPUs off and on. CPUs
 200           can be controlled through /sys/devices/system/cpu/cpu#.
 201           Say N if you want to disable CPU hotplug.
 202
 203 config MATHEMU
 204         bool "IEEE FPU emulation"
 205         depends on MARCH_G5
 206         help
 207           This option is required for IEEE compliant floating point arithmetic
 208           on older S/390 machines. Say Y unless you know your machine doesn't
 209           need this.
 210
 211 config COMPAT
 212         bool "Kernel support for 31 bit emulation"
 213         depends on 64BIT
 214         select COMPAT_BINFMT_ELF
 215         help
 216           Select this option if you want to enable your system kernel to
 217           handle system-calls from ELF binaries for 31 bit ESA.  This option
 218           (and some other stuff like libraries and such) is needed for
 219           executing 31 bit applications.  It is safe to say "Y".
 220
 221 config SYSVIPC_COMPAT
 222         bool
 223         depends on COMPAT && SYSVIPC
 224         default y
 225
 226 config AUDIT_ARCH
 227         bool
 228         default y
 229
 230 config S390_EXEC_PROTECT
 231         bool "Data execute protection"
 232         help
 233           This option allows to enable a buffer overflow protection for user
 234           space programs and it also selects the addressing mode option above.
 235           The kernel parameter noexec=on will enable this feature and also
 236           switch the addressing modes, default is disabled. Enabling this (via
 237           kernel parameter) on machines earlier than IBM System z9-109 EC/BC
 238           will reduce system performance.
 239
 240 comment "Code generation options"
 241
 242 choice
 243         prompt "Processor type"
 244         default MARCH_G5
 245
 246 config MARCH_G5
 247         bool "S/390 model G5 and G6"
 248         depends on !64BIT
 249         help
 250           Select this to build a 31 bit kernel that works
 251           on all S/390 and zSeries machines.
 252
 253 config MARCH_Z900
 254         bool "IBM eServer zSeries model z800 and z900"
 255         help
 256           Select this to optimize for zSeries machines. This
 257           will enable some optimizations that are not available
 258           on older 31 bit only CPUs.
 259
 260 config MARCH_Z990
 261         bool "IBM eServer zSeries model z890 and z990"
 262         help
 263           Select this enable optimizations for model z890/z990.
 264           This will be slightly faster but does not work on
 265           older machines such as the z900.
 266
 267 config MARCH_Z9_109
 268         bool "IBM System z9"
 269         help
 270           Select this to enable optimizations for IBM System z9-109, IBM
 271           System z9 Enterprise Class (z9 EC), and IBM System z9 Business
 272           Class (z9 BC). The kernel will be slightly faster but will not
 273           work on older machines such as the z990, z890, z900, and z800.
 274
 275 config MARCH_Z10
 276         bool "IBM System z10"
 277         help
 278           Select this to enable optimizations for IBM System z10. The
 279           kernel will be slightly faster but will not work on older
 280           machines such as the z990, z890, z900, z800, z9-109, z9-ec
 281           and z9-bc.
 282
 283 endchoice
 284
 285 config PACK_STACK
 286         bool "Pack kernel stack"
 287         help
 288           This option enables the compiler option -mkernel-backchain if it
 289           is available. If the option is available the compiler supports
 290           the new stack layout which dramatically reduces the minimum stack
 291           frame size. With an old compiler a non-leaf function needs a
 292           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 293           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 294           and 24 byte on 64 bit.
 295
 296           Say Y if you are unsure.
 297
 298 config SMALL_STACK
 299         bool "Use 8kb for kernel stack instead of 16kb"
 300         depends on PACK_STACK && 64BIT && !LOCKDEP
 301         help
 302           If you say Y here and the compiler supports the -mkernel-backchain
 303           option the kernel will use a smaller kernel stack size. The reduced
 304           size is 8kb instead of 16kb. This allows to run more threads on a
 305           system and reduces the pressure on the memory management for higher
 306           order page allocations.
 307
 308           Say N if you are unsure.
 309
 310 config CHECK_STACK
 311         bool "Detect kernel stack overflow"
 312         help
 313           This option enables the compiler option -mstack-guard and
 314           -mstack-size if they are available. If the compiler supports them
 315           it will emit additional code to each function prolog to trigger
 316           an illegal operation if the kernel stack is about to overflow.
 317
 318           Say N if you are unsure.
 319
 320 config STACK_GUARD
 321         int "Size of the guard area (128-1024)"
 322         range 128 1024
 323         depends on CHECK_STACK
 324         default "256"
 325         help
 326           This allows you to specify the size of the guard area at the lower
 327           end of the kernel stack. If the kernel stack points into the guard
 328           area on function entry an illegal operation is triggered. The size
 329           needs to be a power of 2. Please keep in mind that the size of an
 330           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 331           The minimum size for the stack guard should be 256 for 31 bit and
 332           512 for 64 bit.
 333
 334 config WARN_STACK
 335         bool "Emit compiler warnings for function with broken stack usage"
 336         help
 337           This option enables the compiler options -mwarn-framesize and
 338           -mwarn-dynamicstack. If the compiler supports these options it
 339           will generate warnings for function which either use alloca or
 340           create a stack frame bigger than CONFIG_WARN_STACK_SIZE.
 341
 342           Say N if you are unsure.
 343
 344 config WARN_STACK_SIZE
 345         int "Maximum frame size considered safe (128-2048)"
 346         range 128 2048
 347         depends on WARN_STACK
 348         default "2048"
 349         help
 350           This allows you to specify the maximum frame size a function may
 351           have without the compiler complaining about it.
 352
 353 config ARCH_POPULATES_NODE_MAP
 354         def_bool y
 355
 356 comment "Kernel preemption"
 357
 358 source "kernel/Kconfig.preempt"
 359
 360 config ARCH_SPARSEMEM_ENABLE
 361         def_bool y
 362         select SPARSEMEM_VMEMMAP_ENABLE
 363         select SPARSEMEM_VMEMMAP
 364         select SPARSEMEM_STATIC if !64BIT
 365
 366 config ARCH_SPARSEMEM_DEFAULT
 367         def_bool y
 368
 369 config ARCH_SELECT_MEMORY_MODEL
 370        def_bool y
 371
 372 config ARCH_ENABLE_MEMORY_HOTPLUG
 373         def_bool y
 374         depends on SPARSEMEM
 375
 376 config ARCH_ENABLE_MEMORY_HOTREMOVE
 377         def_bool y
 378
 379 config ARCH_HIBERNATION_POSSIBLE
 380        def_bool y if 64BIT
 381
 382 source "mm/Kconfig"
 383
 384 comment "I/O subsystem configuration"
 385
 386 config QDIO
 387         tristate "QDIO support"
 388         ---help---
 389           This driver provides the Queued Direct I/O base support for
 390           IBM System z.
 391
 392           To compile this driver as a module, choose M here: the
 393           module will be called qdio.
 394
 395           If unsure, say Y.
 396
 397 config CHSC_SCH
 398         tristate "Support for CHSC subchannels"
 399         help
 400           This driver allows usage of CHSC subchannels. A CHSC subchannel
 401           is usually present on LPAR only.
 402           The driver creates a device /dev/chsc, which may be used to
 403           obtain I/O configuration information about the machine and
 404           to issue asynchronous chsc commands (DANGEROUS).
 405           You will usually only want to use this interface on a special
 406           LPAR designated for system management.
 407
 408           To compile this driver as a module, choose M here: the
 409           module will be called chsc_sch.
 410
 411           If unsure, say N.
 412
 413 comment "Misc"
 414
 415 config IPL
 416         bool "Builtin IPL record support"
 417         help
 418           If you want to use the produced kernel to IPL directly from a
 419           device, you have to merge a bootsector specific to the device
 420           into the first bytes of the kernel. You will have to select the
 421           IPL device.
 422
 423 choice
 424         prompt "IPL method generated into head.S"
 425         depends on IPL
 426         default IPL_VM
 427         help
 428           Select "tape" if you want to IPL the image from a Tape.
 429
 430           Select "vm_reader" if you are running under VM/ESA and want
 431           to IPL the image from the emulated card reader.
 432
 433 config IPL_TAPE
 434         bool "tape"
 435
 436 config IPL_VM
 437         bool "vm_reader"
 438
 439 endchoice
 440
 441 source "fs/Kconfig.binfmt"
 442
 443 config FORCE_MAX_ZONEORDER
 444         int
 445         default "9"
 446
 447 config PROCESS_DEBUG
 448         bool "Show crashed user process info"
 449         help
 450           Say Y to print all process fault locations to the console.  This is
 451           a debugging option; you probably do not want to set it unless you
 452           are an S390 port maintainer.
 453
 454 config PFAULT
 455         bool "Pseudo page fault support"
 456         help
 457           Select this option, if you want to use PFAULT pseudo page fault
 458           handling under VM. If running native or in LPAR, this option
 459           has no effect. If your VM does not support PFAULT, PAGEEX
 460           pseudo page fault handling will be used.
 461           Note that VM 4.2 supports PFAULT but has a bug in its
 462           implementation that causes some problems.
 463           Everybody who wants to run Linux under VM != VM4.2 should select
 464           this option.
 465
 466 config SHARED_KERNEL
 467         bool "VM shared kernel support"
 468         help
 469           Select this option, if you want to share the text segment of the
 470           Linux kernel between different VM guests. This reduces memory
 471           usage with lots of guests but greatly increases kernel size.
 472           Also if a kernel was IPL'ed from a shared segment the kexec system
 473           call will not work.
 474           You should only select this option if you know what you are
 475           doing and want to exploit this feature.
 476
 477 config CMM
 478         tristate "Cooperative memory management"
 479         help
 480           Select this option, if you want to enable the kernel interface
 481           to reduce the memory size of the system. This is accomplished
 482           by allocating pages of memory and put them "on hold". This only
 483           makes sense for a system running under VM where the unused pages
 484           will be reused by VM for other guest systems. The interface
 485           allows an external monitor to balance memory of many systems.
 486           Everybody who wants to run Linux under VM should select this
 487           option.
 488
 489 config CMM_PROC
 490         bool "/proc interface to cooperative memory management"
 491         depends on CMM
 492         help
 493           Select this option to enable the /proc interface to the
 494           cooperative memory management.
 495
 496 config CMM_IUCV
 497         bool "IUCV special message interface to cooperative memory management"
 498         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 499         help
 500           Select this option to enable the special message interface to
 501           the cooperative memory management.
 502
 503 config APPLDATA_BASE
 504         bool "Linux - VM Monitor Stream, base infrastructure"
 505         depends on PROC_FS
 506         help
 507           This provides a kernel interface for creating and updating z/VM APPLDATA
 508           monitor records. The monitor records are updated at certain time
 509           intervals, once the timer is started.
 510           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 511           i.e. enables or disables monitoring on the Linux side.
 512           A custom interval value (in seconds) can be written to
 513           /proc/appldata/interval.
 514
 515           Defaults are 60 seconds interval and timer off.
 516           The /proc entries can also be read from, showing the current settings.
 517
 518 config APPLDATA_MEM
 519         tristate "Monitor memory management statistics"
 520         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 521         help
 522           This provides memory management related data to the Linux - VM Monitor
 523           Stream, like paging/swapping rate, memory utilisation, etc.
 524           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 525           APPLDATA monitor record, i.e. enables or disables monitoring this record
 526           on the z/VM side.
 527
 528           Default is disabled.
 529           The /proc entry can also be read from, showing the current settings.
 530
 531           This can also be compiled as a module, which will be called
 532           appldata_mem.o.
 533
 534 config APPLDATA_OS
 535         tristate "Monitor OS statistics"
 536         depends on APPLDATA_BASE
 537         help
 538           This provides OS related data to the Linux - VM Monitor Stream, like
 539           CPU utilisation, etc.
 540           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 541           APPLDATA monitor record, i.e. enables or disables monitoring this record
 542           on the z/VM side.
 543
 544           Default is disabled.
 545           This can also be compiled as a module, which will be called
 546           appldata_os.o.
 547
 548 config APPLDATA_NET_SUM
 549         tristate "Monitor overall network statistics"
 550         depends on APPLDATA_BASE && NET
 551         help
 552           This provides network related data to the Linux - VM Monitor Stream,
 553           currently there is only a total sum of network I/O statistics, no
 554           per-interface data.
 555           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 556           APPLDATA monitor record, i.e. enables or disables monitoring this record
 557           on the z/VM side.
 558
 559           Default is disabled.
 560           This can also be compiled as a module, which will be called
 561           appldata_net_sum.o.
 562
 563 source kernel/Kconfig.hz
 564
 565 config S390_HYPFS_FS
 566         bool "s390 hypervisor file system support"
 567         select SYS_HYPERVISOR
 568         default y
 569         help
 570           This is a virtual file system intended to provide accounting
 571           information in an s390 hypervisor environment.
 572
 573 config KEXEC
 574         bool "kexec system call"
 575         help
 576           kexec is a system call that implements the ability to shutdown your
 577           current kernel, and to start another kernel.  It is like a reboot
 578           but is independent of hardware/microcode support.
 579
 580 config ZFCPDUMP
 581         bool "zfcpdump support"
 582         select SMP
 583         default n
 584         help
 585           Select this option if you want to build an zfcpdump enabled kernel.
 586           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 587
 588 config S390_GUEST
 589 bool "s390 guest support for KVM (EXPERIMENTAL)"
 590         depends on 64BIT && EXPERIMENTAL
 591         select VIRTIO
 592         select VIRTIO_RING
 593         select VIRTIO_CONSOLE
 594         help
 595           Select this option if you want to run the kernel as a guest under
 596           the KVM hypervisor. This will add detection for KVM as well  as a
 597           virtio transport. If KVM is detected, the virtio console will be
 598           the default console.
 599
 600 config SECCOMP
 601         bool "Enable seccomp to safely compute untrusted bytecode"
 602         depends on PROC_FS
 603         default y
 604         help
 605           This kernel feature is useful for number crunching applications
 606           that may need to compute untrusted bytecode during their
 607           execution. By using pipes or other transports made available to
 608           the process as file descriptors supporting the read/write
 609           syscalls, it's possible to isolate those applications in
 610           their own address space using seccomp. Once seccomp is
 611           enabled via /proc/<pid>/seccomp, it cannot be disabled
 612           and the task is only allowed to execute a few safe syscalls
 613           defined by each seccomp mode.
 614
 615           If unsure, say Y.
 616
 617 endmenu
 618
 619 menu "Power Management"
 620
 621 source "kernel/power/Kconfig"
 622
 623 endmenu
 624
 625 source "net/Kconfig"
 626
 627 config PCMCIA
 628         def_bool n
 629
 630 config CCW
 631         def_bool y
 632
 633 source "drivers/Kconfig"
 634
 635 source "fs/Kconfig"
 636
 637 source "arch/s390/Kconfig.debug"
 638
 639 source "security/Kconfig"
 640
 641 source "crypto/Kconfig"
 642
 643 source "lib/Kconfig"
 644
 645 source "arch/s390/kvm/Kconfig"