arch/s390/Kconfig

   1 config MMU
   2         def_bool y
   3
   4 config ZONE_DMA
   5         def_bool y
   6
   7 config LOCKDEP_SUPPORT
   8         def_bool y
   9
  10 config STACKTRACE_SUPPORT
  11         def_bool y
  12
  13 config HAVE_LATENCYTOP_SUPPORT
  14         def_bool y
  15
  16 config RWSEM_GENERIC_SPINLOCK
  17         bool
  18
  19 config RWSEM_XCHGADD_ALGORITHM
  20         def_bool y
  21
  22 config ARCH_HAS_ILOG2_U32
  23         def_bool n
  24
  25 config ARCH_HAS_ILOG2_U64
  26         def_bool n
  27
  28 config GENERIC_HWEIGHT
  29         def_bool y
  30
  31 config GENERIC_BUG
  32         def_bool y if BUG
  33
  34 config GENERIC_BUG_RELATIVE_POINTERS
  35         def_bool y
  36
  37 config NO_IOMEM
  38         def_bool y
  39
  40 config NO_DMA
  41         def_bool y
  42
  43 config ARCH_DMA_ADDR_T_64BIT
  44         def_bool 64BIT
  45
  46 config GENERIC_LOCKBREAK
  47         def_bool y if SMP && PREEMPT
  48
  49 config PGSTE
  50         def_bool y if KVM
  51
  52 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  53         def_bool y
  54
  55 config KEXEC
  56         def_bool y
  57
  58 config AUDIT_ARCH
  59         def_bool y
  60
  61 config S390
  62         def_bool y
  63         select USE_GENERIC_SMP_HELPERS if SMP
  64         select GENERIC_CPU_DEVICES if !SMP
  65         select HAVE_SYSCALL_WRAPPERS
  66         select HAVE_FUNCTION_TRACER
  67         select HAVE_FUNCTION_TRACE_MCOUNT_TEST
  68         select HAVE_FTRACE_MCOUNT_RECORD
  69         select HAVE_C_RECORDMCOUNT
  70         select HAVE_SYSCALL_TRACEPOINTS
  71         select HAVE_DYNAMIC_FTRACE
  72         select HAVE_FUNCTION_GRAPH_TRACER
  73         select HAVE_REGS_AND_STACK_ACCESS_API
  74         select HAVE_OPROFILE
  75         select HAVE_KPROBES
  76         select HAVE_KRETPROBES
  77         select HAVE_KVM if 64BIT
  78         select HAVE_ARCH_TRACEHOOK
  79         select INIT_ALL_POSSIBLE
  80         select HAVE_IRQ_WORK
  81         select HAVE_PERF_EVENTS
  82         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  83         select HAVE_DEBUG_KMEMLEAK
  84         select HAVE_KERNEL_GZIP
  85         select HAVE_KERNEL_BZIP2
  86         select HAVE_KERNEL_LZMA
  87         select HAVE_KERNEL_LZO
  88         select HAVE_KERNEL_XZ
  89         select HAVE_ARCH_MUTEX_CPU_RELAX
  90         select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
  91         select HAVE_BPF_JIT if 64BIT && PACK_STACK
  92         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
  93         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  94         select HAVE_MEMBLOCK
  95         select HAVE_MEMBLOCK_NODE_MAP
  96         select HAVE_CMPXCHG_LOCAL
  97         select HAVE_CMPXCHG_DOUBLE
  98         select HAVE_VIRT_CPU_ACCOUNTING
  99         select VIRT_CPU_ACCOUNTING
 100         select ARCH_DISCARD_MEMBLOCK
 101         select BUILDTIME_EXTABLE_SORT
 102         select ARCH_INLINE_SPIN_TRYLOCK
 103         select ARCH_INLINE_SPIN_TRYLOCK_BH
 104         select ARCH_INLINE_SPIN_LOCK
 105         select ARCH_INLINE_SPIN_LOCK_BH
 106         select ARCH_INLINE_SPIN_LOCK_IRQ
 107         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
 108         select ARCH_INLINE_SPIN_UNLOCK
 109         select ARCH_INLINE_SPIN_UNLOCK_BH
 110         select ARCH_INLINE_SPIN_UNLOCK_IRQ
 111         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
 112         select ARCH_INLINE_READ_TRYLOCK
 113         select ARCH_INLINE_READ_LOCK
 114         select ARCH_INLINE_READ_LOCK_BH
 115         select ARCH_INLINE_READ_LOCK_IRQ
 116         select ARCH_INLINE_READ_LOCK_IRQSAVE
 117         select ARCH_INLINE_READ_UNLOCK
 118         select ARCH_INLINE_READ_UNLOCK_BH
 119         select ARCH_INLINE_READ_UNLOCK_IRQ
 120         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
 121         select ARCH_INLINE_WRITE_TRYLOCK
 122         select ARCH_INLINE_WRITE_LOCK
 123         select ARCH_INLINE_WRITE_LOCK_BH
 124         select ARCH_INLINE_WRITE_LOCK_IRQ
 125         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 126         select ARCH_INLINE_WRITE_UNLOCK
 127         select ARCH_INLINE_WRITE_UNLOCK_BH
 128         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 129         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 130         select HAVE_UID16 if 32BIT
 131         select ARCH_WANT_IPC_PARSE_VERSION
 132         select GENERIC_SMP_IDLE_THREAD
 133         select GENERIC_TIME_VSYSCALL
 134         select GENERIC_CLOCKEVENTS
 135         select KTIME_SCALAR if 32BIT
 136         select HAVE_ARCH_SECCOMP_FILTER
 137
 138 config SCHED_OMIT_FRAME_POINTER
 139         def_bool y
 140
 141 source "init/Kconfig"
 142
 143 source "kernel/Kconfig.freezer"
 144
 145 menu "Processor type and features"
 146
 147 config HAVE_MARCH_Z900_FEATURES
 148         def_bool n
 149
 150 config HAVE_MARCH_Z990_FEATURES
 151         def_bool n
 152         select HAVE_MARCH_Z900_FEATURES
 153
 154 config HAVE_MARCH_Z9_109_FEATURES
 155         def_bool n
 156         select HAVE_MARCH_Z990_FEATURES
 157
 158 config HAVE_MARCH_Z10_FEATURES
 159         def_bool n
 160         select HAVE_MARCH_Z9_109_FEATURES
 161
 162 config HAVE_MARCH_Z196_FEATURES
 163         def_bool n
 164         select HAVE_MARCH_Z10_FEATURES
 165
 166 choice
 167         prompt "Processor type"
 168         default MARCH_G5
 169
 170 config MARCH_G5
 171         bool "System/390 model G5 and G6"
 172         depends on !64BIT
 173         help
 174           Select this to build a 31 bit kernel that works
 175           on all ESA/390 and z/Architecture machines.
 176
 177 config MARCH_Z900
 178         bool "IBM zSeries model z800 and z900"
 179         select HAVE_MARCH_Z900_FEATURES if 64BIT
 180         help
 181           Select this to enable optimizations for model z800/z900 (2064 and
 182           2066 series). This will enable some optimizations that are not
 183           available on older ESA/390 (31 Bit) only CPUs.
 184
 185 config MARCH_Z990
 186         bool "IBM zSeries model z890 and z990"
 187         select HAVE_MARCH_Z990_FEATURES if 64BIT
 188         help
 189           Select this to enable optimizations for model z890/z990 (2084 and
 190           2086 series). The kernel will be slightly faster but will not work
 191           on older machines.
 192
 193 config MARCH_Z9_109
 194         bool "IBM System z9"
 195         select HAVE_MARCH_Z9_109_FEATURES if 64BIT
 196         help
 197           Select this to enable optimizations for IBM System z9 (2094 and
 198           2096 series). The kernel will be slightly faster but will not work
 199           on older machines.
 200
 201 config MARCH_Z10
 202         bool "IBM System z10"
 203         select HAVE_MARCH_Z10_FEATURES if 64BIT
 204         help
 205           Select this to enable optimizations for IBM System z10 (2097 and
 206           2098 series). The kernel will be slightly faster but will not work
 207           on older machines.
 208
 209 config MARCH_Z196
 210         bool "IBM zEnterprise 114 and 196"
 211         select HAVE_MARCH_Z196_FEATURES if 64BIT
 212         help
 213           Select this to enable optimizations for IBM zEnterprise 114 and 196
 214           (2818 and 2817 series). The kernel will be slightly faster but will
 215           not work on older machines.
 216
 217 endchoice
 218
 219 config 64BIT
 220         def_bool y
 221         prompt "64 bit kernel"
 222         help
 223           Select this option if you have an IBM z/Architecture machine
 224           and want to use the 64 bit addressing mode.
 225
 226 config 32BIT
 227         def_bool y if !64BIT
 228
 229 config COMPAT
 230         def_bool y
 231         prompt "Kernel support for 31 bit emulation"
 232         depends on 64BIT
 233         select COMPAT_BINFMT_ELF if BINFMT_ELF
 234         select ARCH_WANT_OLD_COMPAT_IPC
 235         help
 236           Select this option if you want to enable your system kernel to
 237           handle system-calls from ELF binaries for 31 bit ESA.  This option
 238           (and some other stuff like libraries and such) is needed for
 239           executing 31 bit applications.  It is safe to say "Y".
 240
 241 config SYSVIPC_COMPAT
 242         def_bool y if COMPAT && SYSVIPC
 243
 244 config KEYS_COMPAT
 245         def_bool y if COMPAT && KEYS
 246
 247 config SMP
 248         def_bool y
 249         prompt "Symmetric multi-processing support"
 250         ---help---
 251           This enables support for systems with more than one CPU. If you have
 252           a system with only one CPU, like most personal computers, say N. If
 253           you have a system with more than one CPU, say Y.
 254
 255           If you say N here, the kernel will run on single and multiprocessor
 256           machines, but will use only one CPU of a multiprocessor machine. If
 257           you say Y here, the kernel will run on many, but not all,
 258           singleprocessor machines. On a singleprocessor machine, the kernel
 259           will run faster if you say N here.
 260
 261           See also the SMP-HOWTO available at
 262           <http://www.tldp.org/docs.html#howto>.
 263
 264           Even if you don't know what to do here, say Y.
 265
 266 config NR_CPUS
 267         int "Maximum number of CPUs (2-64)"
 268         range 2 64
 269         depends on SMP
 270         default "32" if !64BIT
 271         default "64" if 64BIT
 272         help
 273           This allows you to specify the maximum number of CPUs which this
 274           kernel will support.  The maximum supported value is 64 and the
 275           minimum value which makes sense is 2.
 276
 277           This is purely to save memory - each supported CPU adds
 278           approximately sixteen kilobytes to the kernel image.
 279
 280 config HOTPLUG_CPU
 281         def_bool y
 282         prompt "Support for hot-pluggable CPUs"
 283         depends on SMP
 284         select HOTPLUG
 285         help
 286           Say Y here to be able to turn CPUs off and on. CPUs
 287           can be controlled through /sys/devices/system/cpu/cpu#.
 288           Say N if you want to disable CPU hotplug.
 289
 290 config SCHED_MC
 291         def_bool n
 292
 293 config SCHED_BOOK
 294         def_bool y
 295         prompt "Book scheduler support"
 296         depends on SMP
 297         select SCHED_MC
 298         help
 299           Book scheduler support improves the CPU scheduler's decision making
 300           when dealing with machines that have several books.
 301
 302 source kernel/Kconfig.preempt
 303
 304 config MATHEMU
 305         def_bool y
 306         prompt "IEEE FPU emulation"
 307         depends on MARCH_G5
 308         help
 309           This option is required for IEEE compliant floating point arithmetic
 310           on older ESA/390 machines. Say Y unless you know your machine doesn't
 311           need this.
 312
 313 source kernel/Kconfig.hz
 314
 315 endmenu
 316
 317 menu "Memory setup"
 318
 319 config ARCH_SPARSEMEM_ENABLE
 320         def_bool y
 321         select SPARSEMEM_VMEMMAP_ENABLE
 322         select SPARSEMEM_VMEMMAP
 323         select SPARSEMEM_STATIC if !64BIT
 324
 325 config ARCH_SPARSEMEM_DEFAULT
 326         def_bool y
 327
 328 config ARCH_SELECT_MEMORY_MODEL
 329         def_bool y
 330
 331 config ARCH_ENABLE_MEMORY_HOTPLUG
 332         def_bool y if SPARSEMEM
 333
 334 config ARCH_ENABLE_MEMORY_HOTREMOVE
 335         def_bool y
 336
 337 config FORCE_MAX_ZONEORDER
 338         int
 339         default "9"
 340
 341 source "mm/Kconfig"
 342
 343 config PACK_STACK
 344         def_bool y
 345         prompt "Pack kernel stack"
 346         help
 347           This option enables the compiler option -mkernel-backchain if it
 348           is available. If the option is available the compiler supports
 349           the new stack layout which dramatically reduces the minimum stack
 350           frame size. With an old compiler a non-leaf function needs a
 351           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 352           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 353           and 24 byte on 64 bit.
 354
 355           Say Y if you are unsure.
 356
 357 config SMALL_STACK
 358         def_bool n
 359         prompt "Use 8kb for kernel stack instead of 16kb"
 360         depends on PACK_STACK && 64BIT && !LOCKDEP
 361         help
 362           If you say Y here and the compiler supports the -mkernel-backchain
 363           option the kernel will use a smaller kernel stack size. The reduced
 364           size is 8kb instead of 16kb. This allows to run more threads on a
 365           system and reduces the pressure on the memory management for higher
 366           order page allocations.
 367
 368           Say N if you are unsure.
 369
 370 config CHECK_STACK
 371         def_bool y
 372         prompt "Detect kernel stack overflow"
 373         help
 374           This option enables the compiler option -mstack-guard and
 375           -mstack-size if they are available. If the compiler supports them
 376           it will emit additional code to each function prolog to trigger
 377           an illegal operation if the kernel stack is about to overflow.
 378
 379           Say N if you are unsure.
 380
 381 config STACK_GUARD
 382         int "Size of the guard area (128-1024)"
 383         range 128 1024
 384         depends on CHECK_STACK
 385         default "256"
 386         help
 387           This allows you to specify the size of the guard area at the lower
 388           end of the kernel stack. If the kernel stack points into the guard
 389           area on function entry an illegal operation is triggered. The size
 390           needs to be a power of 2. Please keep in mind that the size of an
 391           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 392           The minimum size for the stack guard should be 256 for 31 bit and
 393           512 for 64 bit.
 394
 395 config WARN_DYNAMIC_STACK
 396         def_bool n
 397         prompt "Emit compiler warnings for function with dynamic stack usage"
 398         help
 399           This option enables the compiler option -mwarn-dynamicstack. If the
 400           compiler supports this options generates warnings for functions
 401           that dynamically allocate stack space using alloca.
 402
 403           Say N if you are unsure.
 404
 405 endmenu
 406
 407 menu "I/O subsystem"
 408
 409 config QDIO
 410         def_tristate y
 411         prompt "QDIO support"
 412         ---help---
 413           This driver provides the Queued Direct I/O base support for
 414           IBM System z.
 415
 416           To compile this driver as a module, choose M here: the
 417           module will be called qdio.
 418
 419           If unsure, say Y.
 420
 421 config CHSC_SCH
 422         def_tristate m
 423         prompt "Support for CHSC subchannels"
 424         help
 425           This driver allows usage of CHSC subchannels. A CHSC subchannel
 426           is usually present on LPAR only.
 427           The driver creates a device /dev/chsc, which may be used to
 428           obtain I/O configuration information about the machine and
 429           to issue asynchronous chsc commands (DANGEROUS).
 430           You will usually only want to use this interface on a special
 431           LPAR designated for system management.
 432
 433           To compile this driver as a module, choose M here: the
 434           module will be called chsc_sch.
 435
 436           If unsure, say N.
 437
 438 config SCM_BUS
 439         def_bool y
 440         depends on 64BIT
 441         prompt "SCM bus driver"
 442         help
 443           Bus driver for Storage Class Memory.
 444
 445 config EADM_SCH
 446         def_tristate m
 447         prompt "Support for EADM subchannels"
 448         depends on SCM_BUS
 449         help
 450           This driver allows usage of EADM subchannels. EADM subchannels act
 451           as a communication vehicle for SCM increments.
 452
 453           To compile this driver as a module, choose M here: the
 454           module will be called eadm_sch.
 455
 456 endmenu
 457
 458 menu "Dump support"
 459
 460 config CRASH_DUMP
 461         bool "kernel crash dumps"
 462         depends on 64BIT && SMP
 463         select KEXEC
 464         help
 465           Generate crash dump after being started by kexec.
 466           Crash dump kernels are loaded in the main kernel with kexec-tools
 467           into a specially reserved region and then later executed after
 468           a crash by kdump/kexec.
 469           For more details see Documentation/kdump/kdump.txt
 470
 471 config ZFCPDUMP
 472         def_bool n
 473         prompt "zfcpdump support"
 474         select SMP
 475         help
 476           Select this option if you want to build an zfcpdump enabled kernel.
 477           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 478
 479 endmenu
 480
 481 menu "Executable file formats / Emulations"
 482
 483 source "fs/Kconfig.binfmt"
 484
 485 config SECCOMP
 486         def_bool y
 487         prompt "Enable seccomp to safely compute untrusted bytecode"
 488         depends on PROC_FS
 489         help
 490           This kernel feature is useful for number crunching applications
 491           that may need to compute untrusted bytecode during their
 492           execution. By using pipes or other transports made available to
 493           the process as file descriptors supporting the read/write
 494           syscalls, it's possible to isolate those applications in
 495           their own address space using seccomp. Once seccomp is
 496           enabled via /proc/<pid>/seccomp, it cannot be disabled
 497           and the task is only allowed to execute a few safe syscalls
 498           defined by each seccomp mode.
 499
 500           If unsure, say Y.
 501
 502 endmenu
 503
 504 menu "Power Management"
 505
 506 config ARCH_HIBERNATION_POSSIBLE
 507         def_bool y if 64BIT
 508
 509 source "kernel/power/Kconfig"
 510
 511 endmenu
 512
 513 source "net/Kconfig"
 514
 515 config PCMCIA
 516         def_bool n
 517
 518 config CCW
 519         def_bool y
 520
 521 source "drivers/Kconfig"
 522
 523 source "fs/Kconfig"
 524
 525 source "arch/s390/Kconfig.debug"
 526
 527 source "security/Kconfig"
 528
 529 source "crypto/Kconfig"
 530
 531 source "lib/Kconfig"
 532
 533 menu "Virtualization"
 534
 535 config PFAULT
 536         def_bool y
 537         prompt "Pseudo page fault support"
 538         help
 539           Select this option, if you want to use PFAULT pseudo page fault
 540           handling under VM. If running native or in LPAR, this option
 541           has no effect. If your VM does not support PFAULT, PAGEEX
 542           pseudo page fault handling will be used.
 543           Note that VM 4.2 supports PFAULT but has a bug in its
 544           implementation that causes some problems.
 545           Everybody who wants to run Linux under VM != VM4.2 should select
 546           this option.
 547
 548 config SHARED_KERNEL
 549         bool "VM shared kernel support"
 550         depends on !JUMP_LABEL
 551         help
 552           Select this option, if you want to share the text segment of the
 553           Linux kernel between different VM guests. This reduces memory
 554           usage with lots of guests but greatly increases kernel size.
 555           Also if a kernel was IPL'ed from a shared segment the kexec system
 556           call will not work.
 557           You should only select this option if you know what you are
 558           doing and want to exploit this feature.
 559
 560 config CMM
 561         def_tristate n
 562         prompt "Cooperative memory management"
 563         help
 564           Select this option, if you want to enable the kernel interface
 565           to reduce the memory size of the system. This is accomplished
 566           by allocating pages of memory and put them "on hold". This only
 567           makes sense for a system running under VM where the unused pages
 568           will be reused by VM for other guest systems. The interface
 569           allows an external monitor to balance memory of many systems.
 570           Everybody who wants to run Linux under VM should select this
 571           option.
 572
 573 config CMM_IUCV
 574         def_bool y
 575         prompt "IUCV special message interface to cooperative memory management"
 576         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 577         help
 578           Select this option to enable the special message interface to
 579           the cooperative memory management.
 580
 581 config APPLDATA_BASE
 582         def_bool n
 583         prompt "Linux - VM Monitor Stream, base infrastructure"
 584         depends on PROC_FS
 585         help
 586           This provides a kernel interface for creating and updating z/VM APPLDATA
 587           monitor records. The monitor records are updated at certain time
 588           intervals, once the timer is started.
 589           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 590           i.e. enables or disables monitoring on the Linux side.
 591           A custom interval value (in seconds) can be written to
 592           /proc/appldata/interval.
 593
 594           Defaults are 60 seconds interval and timer off.
 595           The /proc entries can also be read from, showing the current settings.
 596
 597 config APPLDATA_MEM
 598         def_tristate m
 599         prompt "Monitor memory management statistics"
 600         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 601         help
 602           This provides memory management related data to the Linux - VM Monitor
 603           Stream, like paging/swapping rate, memory utilisation, etc.
 604           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 605           APPLDATA monitor record, i.e. enables or disables monitoring this record
 606           on the z/VM side.
 607
 608           Default is disabled.
 609           The /proc entry can also be read from, showing the current settings.
 610
 611           This can also be compiled as a module, which will be called
 612           appldata_mem.o.
 613
 614 config APPLDATA_OS
 615         def_tristate m
 616         prompt "Monitor OS statistics"
 617         depends on APPLDATA_BASE
 618         help
 619           This provides OS related data to the Linux - VM Monitor Stream, like
 620           CPU utilisation, etc.
 621           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 622           APPLDATA monitor record, i.e. enables or disables monitoring this record
 623           on the z/VM side.
 624
 625           Default is disabled.
 626           This can also be compiled as a module, which will be called
 627           appldata_os.o.
 628
 629 config APPLDATA_NET_SUM
 630         def_tristate m
 631         prompt "Monitor overall network statistics"
 632         depends on APPLDATA_BASE && NET
 633         help
 634           This provides network related data to the Linux - VM Monitor Stream,
 635           currently there is only a total sum of network I/O statistics, no
 636           per-interface data.
 637           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 638           APPLDATA monitor record, i.e. enables or disables monitoring this record
 639           on the z/VM side.
 640
 641           Default is disabled.
 642           This can also be compiled as a module, which will be called
 643           appldata_net_sum.o.
 644
 645 config S390_HYPFS_FS
 646         def_bool y
 647         prompt "s390 hypervisor file system support"
 648         select SYS_HYPERVISOR
 649         help
 650           This is a virtual file system intended to provide accounting
 651           information in an s390 hypervisor environment.
 652
 653 source "arch/s390/kvm/Kconfig"
 654
 655 config S390_GUEST
 656         def_bool y
 657         prompt "s390 support for virtio devices (EXPERIMENTAL)"
 658         depends on 64BIT && EXPERIMENTAL
 659         select VIRTUALIZATION
 660         select VIRTIO
 661         select VIRTIO_CONSOLE
 662         help
 663           Enabling this option adds support for virtio based paravirtual device
 664           drivers on s390.
 665
 666           Select this option if you want to run the kernel as a guest under
 667           the KVM hypervisor.
 668
 669 endmenu