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_VSYSCALL
  44         def_bool y
  45
  46 config GENERIC_CLOCKEVENTS
  47         def_bool y
  48
  49 config GENERIC_BUG
  50         bool
  51         depends on BUG
  52         default y
  53
  54 config GENERIC_BUG_RELATIVE_POINTERS
  55         def_bool y
  56
  57 config NO_IOMEM
  58         def_bool y
  59
  60 config NO_DMA
  61         def_bool y
  62
  63 config GENERIC_LOCKBREAK
  64         bool
  65         default y
  66         depends on SMP && PREEMPT
  67
  68 config PGSTE
  69         bool
  70         default y if KVM
  71
  72 config VIRT_CPU_ACCOUNTING
  73         def_bool y
  74
  75 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  76         def_bool y
  77
  78 mainmenu "Linux Kernel Configuration"
  79
  80 config S390
  81         def_bool y
  82         select USE_GENERIC_SMP_HELPERS if SMP
  83         select HAVE_SYSCALL_WRAPPERS
  84         select HAVE_FUNCTION_TRACER
  85         select HAVE_FUNCTION_TRACE_MCOUNT_TEST
  86         select HAVE_FTRACE_MCOUNT_RECORD
  87         select HAVE_SYSCALL_TRACEPOINTS
  88         select HAVE_DYNAMIC_FTRACE
  89         select HAVE_FUNCTION_GRAPH_TRACER
  90         select HAVE_REGS_AND_STACK_ACCESS_API
  91         select HAVE_DEFAULT_NO_SPIN_MUTEXES
  92         select HAVE_OPROFILE
  93         select HAVE_KPROBES
  94         select HAVE_KRETPROBES
  95         select HAVE_KVM if 64BIT
  96         select HAVE_ARCH_TRACEHOOK
  97         select INIT_ALL_POSSIBLE
  98         select HAVE_IRQ_WORK
  99         select HAVE_PERF_EVENTS
 100         select HAVE_KERNEL_GZIP
 101         select HAVE_KERNEL_BZIP2
 102         select HAVE_KERNEL_LZMA
 103         select HAVE_KERNEL_LZO
 104         select ARCH_INLINE_SPIN_TRYLOCK
 105         select ARCH_INLINE_SPIN_TRYLOCK_BH
 106         select ARCH_INLINE_SPIN_LOCK
 107         select ARCH_INLINE_SPIN_LOCK_BH
 108         select ARCH_INLINE_SPIN_LOCK_IRQ
 109         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
 110         select ARCH_INLINE_SPIN_UNLOCK
 111         select ARCH_INLINE_SPIN_UNLOCK_BH
 112         select ARCH_INLINE_SPIN_UNLOCK_IRQ
 113         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
 114         select ARCH_INLINE_READ_TRYLOCK
 115         select ARCH_INLINE_READ_LOCK
 116         select ARCH_INLINE_READ_LOCK_BH
 117         select ARCH_INLINE_READ_LOCK_IRQ
 118         select ARCH_INLINE_READ_LOCK_IRQSAVE
 119         select ARCH_INLINE_READ_UNLOCK
 120         select ARCH_INLINE_READ_UNLOCK_BH
 121         select ARCH_INLINE_READ_UNLOCK_IRQ
 122         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
 123         select ARCH_INLINE_WRITE_TRYLOCK
 124         select ARCH_INLINE_WRITE_LOCK
 125         select ARCH_INLINE_WRITE_LOCK_BH
 126         select ARCH_INLINE_WRITE_LOCK_IRQ
 127         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 128         select ARCH_INLINE_WRITE_UNLOCK
 129         select ARCH_INLINE_WRITE_UNLOCK_BH
 130         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 131         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 132
 133 config SCHED_OMIT_FRAME_POINTER
 134         bool
 135         default y
 136
 137 source "init/Kconfig"
 138
 139 source "kernel/Kconfig.freezer"
 140
 141 menu "Base setup"
 142
 143 comment "Processor type and features"
 144
 145 source "kernel/time/Kconfig"
 146
 147 config 64BIT
 148         bool "64 bit kernel"
 149         help
 150           Select this option if you have a 64 bit IBM zSeries machine
 151           and want to use the 64 bit addressing mode.
 152
 153 config 32BIT
 154         bool
 155         default y if !64BIT
 156
 157 config KTIME_SCALAR
 158         def_bool 32BIT
 159
 160 config SMP
 161         bool "Symmetric multi-processing support"
 162         ---help---
 163           This enables support for systems with more than one CPU. If you have
 164           a system with only one CPU, like most personal computers, say N. If
 165           you have a system with more than one CPU, say Y.
 166
 167           If you say N here, the kernel will run on single and multiprocessor
 168           machines, but will use only one CPU of a multiprocessor machine. If
 169           you say Y here, the kernel will run on many, but not all,
 170           singleprocessor machines. On a singleprocessor machine, the kernel
 171           will run faster if you say N here.
 172
 173           See also the SMP-HOWTO available at
 174           <http://www.tldp.org/docs.html#howto>.
 175
 176           Even if you don't know what to do here, say Y.
 177
 178 config NR_CPUS
 179         int "Maximum number of CPUs (2-64)"
 180         range 2 64
 181         depends on SMP
 182         default "32" if !64BIT
 183         default "64" if 64BIT
 184         help
 185           This allows you to specify the maximum number of CPUs which this
 186           kernel will support.  The maximum supported value is 64 and the
 187           minimum value which makes sense is 2.
 188
 189           This is purely to save memory - each supported CPU adds
 190           approximately sixteen kilobytes to the kernel image.
 191
 192 config HOTPLUG_CPU
 193         bool "Support for hot-pluggable CPUs"
 194         depends on SMP
 195         select HOTPLUG
 196         default n
 197         help
 198           Say Y here to be able to turn CPUs off and on. CPUs
 199           can be controlled through /sys/devices/system/cpu/cpu#.
 200           Say N if you want to disable CPU hotplug.
 201
 202 config MATHEMU
 203         bool "IEEE FPU emulation"
 204         depends on MARCH_G5
 205         help
 206           This option is required for IEEE compliant floating point arithmetic
 207           on older S/390 machines. Say Y unless you know your machine doesn't
 208           need this.
 209
 210 config COMPAT
 211         bool "Kernel support for 31 bit emulation"
 212         depends on 64BIT
 213         select COMPAT_BINFMT_ELF
 214         help
 215           Select this option if you want to enable your system kernel to
 216           handle system-calls from ELF binaries for 31 bit ESA.  This option
 217           (and some other stuff like libraries and such) is needed for
 218           executing 31 bit applications.  It is safe to say "Y".
 219
 220 config SYSVIPC_COMPAT
 221         bool
 222         depends on COMPAT && SYSVIPC
 223         default y
 224
 225 config AUDIT_ARCH
 226         bool
 227         default y
 228
 229 config S390_EXEC_PROTECT
 230         bool "Data execute protection"
 231         help
 232           This option allows to enable a buffer overflow protection for user
 233           space programs and it also selects the addressing mode option above.
 234           The kernel parameter noexec=on will enable this feature and also
 235           switch the addressing modes, default is disabled. Enabling this (via
 236           kernel parameter) on machines earlier than IBM System z9-109 EC/BC
 237           will reduce system performance.
 238
 239 comment "Code generation options"
 240
 241 choice
 242         prompt "Processor type"
 243         default MARCH_G5
 244
 245 config MARCH_G5
 246         bool "S/390 model G5 and G6"
 247         depends on !64BIT
 248         help
 249           Select this to build a 31 bit kernel that works
 250           on all S/390 and zSeries machines.
 251
 252 config MARCH_Z900
 253         bool "IBM eServer zSeries model z800 and z900"
 254         help
 255           Select this to optimize for zSeries machines. This
 256           will enable some optimizations that are not available
 257           on older 31 bit only CPUs.
 258
 259 config MARCH_Z990
 260         bool "IBM eServer zSeries model z890 and z990"
 261         help
 262           Select this enable optimizations for model z890/z990.
 263           This will be slightly faster but does not work on
 264           older machines such as the z900.
 265
 266 config MARCH_Z9_109
 267         bool "IBM System z9"
 268         help
 269           Select this to enable optimizations for IBM System z9-109, IBM
 270           System z9 Enterprise Class (z9 EC), and IBM System z9 Business
 271           Class (z9 BC). The kernel will be slightly faster but will not
 272           work on older machines such as the z990, z890, z900, and z800.
 273
 274 config MARCH_Z10
 275         bool "IBM System z10"
 276         help
 277           Select this to enable optimizations for IBM System z10. The
 278           kernel will be slightly faster but will not work on older
 279           machines such as the z990, z890, z900, z800, z9-109, z9-ec
 280           and z9-bc.
 281
 282 endchoice
 283
 284 config PACK_STACK
 285         bool "Pack kernel stack"
 286         help
 287           This option enables the compiler option -mkernel-backchain if it
 288           is available. If the option is available the compiler supports
 289           the new stack layout which dramatically reduces the minimum stack
 290           frame size. With an old compiler a non-leaf function needs a
 291           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 292           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 293           and 24 byte on 64 bit.
 294
 295           Say Y if you are unsure.
 296
 297 config SMALL_STACK
 298         bool "Use 8kb for kernel stack instead of 16kb"
 299         depends on PACK_STACK && 64BIT && !LOCKDEP
 300         help
 301           If you say Y here and the compiler supports the -mkernel-backchain
 302           option the kernel will use a smaller kernel stack size. The reduced
 303           size is 8kb instead of 16kb. This allows to run more threads on a
 304           system and reduces the pressure on the memory management for higher
 305           order page allocations.
 306
 307           Say N if you are unsure.
 308
 309 config CHECK_STACK
 310         bool "Detect kernel stack overflow"
 311         help
 312           This option enables the compiler option -mstack-guard and
 313           -mstack-size if they are available. If the compiler supports them
 314           it will emit additional code to each function prolog to trigger
 315           an illegal operation if the kernel stack is about to overflow.
 316
 317           Say N if you are unsure.
 318
 319 config STACK_GUARD
 320         int "Size of the guard area (128-1024)"
 321         range 128 1024
 322         depends on CHECK_STACK
 323         default "256"
 324         help
 325           This allows you to specify the size of the guard area at the lower
 326           end of the kernel stack. If the kernel stack points into the guard
 327           area on function entry an illegal operation is triggered. The size
 328           needs to be a power of 2. Please keep in mind that the size of an
 329           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 330           The minimum size for the stack guard should be 256 for 31 bit and
 331           512 for 64 bit.
 332
 333 config WARN_STACK
 334         bool "Emit compiler warnings for function with broken stack usage"
 335         help
 336           This option enables the compiler options -mwarn-framesize and
 337           -mwarn-dynamicstack. If the compiler supports these options it
 338           will generate warnings for function which either use alloca or
 339           create a stack frame bigger than CONFIG_WARN_STACK_SIZE.
 340
 341           Say N if you are unsure.
 342
 343 config WARN_STACK_SIZE
 344         int "Maximum frame size considered safe (128-2048)"
 345         range 128 2048
 346         depends on WARN_STACK
 347         default "2048"
 348         help
 349           This allows you to specify the maximum frame size a function may
 350           have without the compiler complaining about it.
 351
 352 config ARCH_POPULATES_NODE_MAP
 353         def_bool y
 354
 355 comment "Kernel preemption"
 356
 357 source "kernel/Kconfig.preempt"
 358
 359 config ARCH_SPARSEMEM_ENABLE
 360         def_bool y
 361         select SPARSEMEM_VMEMMAP_ENABLE
 362         select SPARSEMEM_VMEMMAP
 363         select SPARSEMEM_STATIC if !64BIT
 364
 365 config ARCH_SPARSEMEM_DEFAULT
 366         def_bool y
 367
 368 config ARCH_SELECT_MEMORY_MODEL
 369        def_bool y
 370
 371 config ARCH_ENABLE_MEMORY_HOTPLUG
 372         def_bool y
 373         depends on SPARSEMEM
 374
 375 config ARCH_ENABLE_MEMORY_HOTREMOVE
 376         def_bool y
 377
 378 config ARCH_HIBERNATION_POSSIBLE
 379        def_bool y if 64BIT
 380
 381 source "mm/Kconfig"
 382
 383 comment "I/O subsystem configuration"
 384
 385 config QDIO
 386         tristate "QDIO support"
 387         ---help---
 388           This driver provides the Queued Direct I/O base support for
 389           IBM System z.
 390
 391           To compile this driver as a module, choose M here: the
 392           module will be called qdio.
 393
 394           If unsure, say Y.
 395
 396 config CHSC_SCH
 397         tristate "Support for CHSC subchannels"
 398         help
 399           This driver allows usage of CHSC subchannels. A CHSC subchannel
 400           is usually present on LPAR only.
 401           The driver creates a device /dev/chsc, which may be used to
 402           obtain I/O configuration information about the machine and
 403           to issue asynchronous chsc commands (DANGEROUS).
 404           You will usually only want to use this interface on a special
 405           LPAR designated for system management.
 406
 407           To compile this driver as a module, choose M here: the
 408           module will be called chsc_sch.
 409
 410           If unsure, say N.
 411
 412 comment "Misc"
 413
 414 config IPL
 415         bool "Builtin IPL record support"
 416         help
 417           If you want to use the produced kernel to IPL directly from a
 418           device, you have to merge a bootsector specific to the device
 419           into the first bytes of the kernel. You will have to select the
 420           IPL device.
 421
 422 choice
 423         prompt "IPL method generated into head.S"
 424         depends on IPL
 425         default IPL_VM
 426         help
 427           Select "tape" if you want to IPL the image from a Tape.
 428
 429           Select "vm_reader" if you are running under VM/ESA and want
 430           to IPL the image from the emulated card reader.
 431
 432 config IPL_TAPE
 433         bool "tape"
 434
 435 config IPL_VM
 436         bool "vm_reader"
 437
 438 endchoice
 439
 440 source "fs/Kconfig.binfmt"
 441
 442 config FORCE_MAX_ZONEORDER
 443         int
 444         default "9"
 445
 446 config PFAULT
 447         bool "Pseudo page fault support"
 448         help
 449           Select this option, if you want to use PFAULT pseudo page fault
 450           handling under VM. If running native or in LPAR, this option
 451           has no effect. If your VM does not support PFAULT, PAGEEX
 452           pseudo page fault handling will be used.
 453           Note that VM 4.2 supports PFAULT but has a bug in its
 454           implementation that causes some problems.
 455           Everybody who wants to run Linux under VM != VM4.2 should select
 456           this option.
 457
 458 config SHARED_KERNEL
 459         bool "VM shared kernel support"
 460         help
 461           Select this option, if you want to share the text segment of the
 462           Linux kernel between different VM guests. This reduces memory
 463           usage with lots of guests but greatly increases kernel size.
 464           Also if a kernel was IPL'ed from a shared segment the kexec system
 465           call will not work.
 466           You should only select this option if you know what you are
 467           doing and want to exploit this feature.
 468
 469 config CMM
 470         tristate "Cooperative memory management"
 471         help
 472           Select this option, if you want to enable the kernel interface
 473           to reduce the memory size of the system. This is accomplished
 474           by allocating pages of memory and put them "on hold". This only
 475           makes sense for a system running under VM where the unused pages
 476           will be reused by VM for other guest systems. The interface
 477           allows an external monitor to balance memory of many systems.
 478           Everybody who wants to run Linux under VM should select this
 479           option.
 480
 481 config CMM_IUCV
 482         bool "IUCV special message interface to cooperative memory management"
 483         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 484         help
 485           Select this option to enable the special message interface to
 486           the cooperative memory management.
 487
 488 config APPLDATA_BASE
 489         bool "Linux - VM Monitor Stream, base infrastructure"
 490         depends on PROC_FS
 491         help
 492           This provides a kernel interface for creating and updating z/VM APPLDATA
 493           monitor records. The monitor records are updated at certain time
 494           intervals, once the timer is started.
 495           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 496           i.e. enables or disables monitoring on the Linux side.
 497           A custom interval value (in seconds) can be written to
 498           /proc/appldata/interval.
 499
 500           Defaults are 60 seconds interval and timer off.
 501           The /proc entries can also be read from, showing the current settings.
 502
 503 config APPLDATA_MEM
 504         tristate "Monitor memory management statistics"
 505         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 506         help
 507           This provides memory management related data to the Linux - VM Monitor
 508           Stream, like paging/swapping rate, memory utilisation, etc.
 509           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 510           APPLDATA monitor record, i.e. enables or disables monitoring this record
 511           on the z/VM side.
 512
 513           Default is disabled.
 514           The /proc entry can also be read from, showing the current settings.
 515
 516           This can also be compiled as a module, which will be called
 517           appldata_mem.o.
 518
 519 config APPLDATA_OS
 520         tristate "Monitor OS statistics"
 521         depends on APPLDATA_BASE
 522         help
 523           This provides OS related data to the Linux - VM Monitor Stream, like
 524           CPU utilisation, etc.
 525           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 526           APPLDATA monitor record, i.e. enables or disables monitoring this record
 527           on the z/VM side.
 528
 529           Default is disabled.
 530           This can also be compiled as a module, which will be called
 531           appldata_os.o.
 532
 533 config APPLDATA_NET_SUM
 534         tristate "Monitor overall network statistics"
 535         depends on APPLDATA_BASE && NET
 536         help
 537           This provides network related data to the Linux - VM Monitor Stream,
 538           currently there is only a total sum of network I/O statistics, no
 539           per-interface data.
 540           Writing 1 or 0 to /proc/appldata/net_sum 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_net_sum.o.
 547
 548 source kernel/Kconfig.hz
 549
 550 config S390_HYPFS_FS
 551         bool "s390 hypervisor file system support"
 552         select SYS_HYPERVISOR
 553         default y
 554         help
 555           This is a virtual file system intended to provide accounting
 556           information in an s390 hypervisor environment.
 557
 558 config KEXEC
 559         bool "kexec system call"
 560         help
 561           kexec is a system call that implements the ability to shutdown your
 562           current kernel, and to start another kernel.  It is like a reboot
 563           but is independent of hardware/microcode support.
 564
 565 config ZFCPDUMP
 566         bool "zfcpdump support"
 567         select SMP
 568         default n
 569         help
 570           Select this option if you want to build an zfcpdump enabled kernel.
 571           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 572
 573 config S390_GUEST
 574 bool "s390 guest support for KVM (EXPERIMENTAL)"
 575         depends on 64BIT && EXPERIMENTAL
 576         select VIRTIO
 577         select VIRTIO_RING
 578         select VIRTIO_CONSOLE
 579         help
 580           Select this option if you want to run the kernel as a guest under
 581           the KVM hypervisor. This will add detection for KVM as well  as a
 582           virtio transport. If KVM is detected, the virtio console will be
 583           the default console.
 584
 585 config SECCOMP
 586         bool "Enable seccomp to safely compute untrusted bytecode"
 587         depends on PROC_FS
 588         default y
 589         help
 590           This kernel feature is useful for number crunching applications
 591           that may need to compute untrusted bytecode during their
 592           execution. By using pipes or other transports made available to
 593           the process as file descriptors supporting the read/write
 594           syscalls, it's possible to isolate those applications in
 595           their own address space using seccomp. Once seccomp is
 596           enabled via /proc/<pid>/seccomp, it cannot be disabled
 597           and the task is only allowed to execute a few safe syscalls
 598           defined by each seccomp mode.
 599
 600           If unsure, say Y.
 601
 602 endmenu
 603
 604 menu "Power Management"
 605
 606 source "kernel/power/Kconfig"
 607
 608 endmenu
 609
 610 source "net/Kconfig"
 611
 612 config PCMCIA
 613         def_bool n
 614
 615 config CCW
 616         def_bool y
 617
 618 source "drivers/Kconfig"
 619
 620 source "fs/Kconfig"
 621
 622 source "arch/s390/Kconfig.debug"
 623
 624 source "security/Kconfig"
 625
 626 source "crypto/Kconfig"
 627
 628 source "lib/Kconfig"
 629
 630 source "arch/s390/kvm/Kconfig"