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