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