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