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_ARCH_MUTEX_CPU_RELAX
  91         select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
  92         select HAVE_RCU_TABLE_FREE if SMP
  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         help
 222           Select this option if you want to enable your system kernel to
 223           handle system-calls from ELF binaries for 31 bit ESA.  This option
 224           (and some other stuff like libraries and such) is needed for
 225           executing 31 bit applications.  It is safe to say "Y".
 226
 227 config SYSVIPC_COMPAT
 228         def_bool y if COMPAT && SYSVIPC
 229
 230 config KEYS_COMPAT
 231         def_bool y if COMPAT && KEYS
 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 comment "Kernel preemption"
 349
 350 source "kernel/Kconfig.preempt"
 351
 352 config ARCH_SPARSEMEM_ENABLE
 353         def_bool y
 354         select SPARSEMEM_VMEMMAP_ENABLE
 355         select SPARSEMEM_VMEMMAP
 356         select SPARSEMEM_STATIC if !64BIT
 357
 358 config ARCH_SPARSEMEM_DEFAULT
 359         def_bool y
 360
 361 config ARCH_SELECT_MEMORY_MODEL
 362         def_bool y
 363
 364 config ARCH_ENABLE_MEMORY_HOTPLUG
 365         def_bool y if SPARSEMEM
 366
 367 config ARCH_ENABLE_MEMORY_HOTREMOVE
 368         def_bool y
 369
 370 config ARCH_HIBERNATION_POSSIBLE
 371         def_bool y if 64BIT
 372
 373 source "mm/Kconfig"
 374
 375 comment "I/O subsystem configuration"
 376
 377 config QDIO
 378         def_tristate y
 379         prompt "QDIO support"
 380         ---help---
 381           This driver provides the Queued Direct I/O base support for
 382           IBM System z.
 383
 384           To compile this driver as a module, choose M here: the
 385           module will be called qdio.
 386
 387           If unsure, say Y.
 388
 389 config CHSC_SCH
 390         def_tristate m
 391         prompt "Support for CHSC subchannels"
 392         help
 393           This driver allows usage of CHSC subchannels. A CHSC subchannel
 394           is usually present on LPAR only.
 395           The driver creates a device /dev/chsc, which may be used to
 396           obtain I/O configuration information about the machine and
 397           to issue asynchronous chsc commands (DANGEROUS).
 398           You will usually only want to use this interface on a special
 399           LPAR designated for system management.
 400
 401           To compile this driver as a module, choose M here: the
 402           module will be called chsc_sch.
 403
 404           If unsure, say N.
 405
 406 comment "Misc"
 407
 408 config IPL
 409         def_bool y
 410         prompt "Builtin IPL record support"
 411         help
 412           If you want to use the produced kernel to IPL directly from a
 413           device, you have to merge a bootsector specific to the device
 414           into the first bytes of the kernel. You will have to select the
 415           IPL device.
 416
 417 choice
 418         prompt "IPL method generated into head.S"
 419         depends on IPL
 420         default IPL_VM
 421         help
 422           Select "tape" if you want to IPL the image from a Tape.
 423
 424           Select "vm_reader" if you are running under VM/ESA and want
 425           to IPL the image from the emulated card reader.
 426
 427 config IPL_TAPE
 428         bool "tape"
 429
 430 config IPL_VM
 431         bool "vm_reader"
 432
 433 endchoice
 434
 435 source "fs/Kconfig.binfmt"
 436
 437 config FORCE_MAX_ZONEORDER
 438         int
 439         default "9"
 440
 441 config PFAULT
 442         def_bool y
 443         prompt "Pseudo page fault support"
 444         help
 445           Select this option, if you want to use PFAULT pseudo page fault
 446           handling under VM. If running native or in LPAR, this option
 447           has no effect. If your VM does not support PFAULT, PAGEEX
 448           pseudo page fault handling will be used.
 449           Note that VM 4.2 supports PFAULT but has a bug in its
 450           implementation that causes some problems.
 451           Everybody who wants to run Linux under VM != VM4.2 should select
 452           this option.
 453
 454 config SHARED_KERNEL
 455         def_bool y
 456         prompt "VM shared kernel support"
 457         help
 458           Select this option, if you want to share the text segment of the
 459           Linux kernel between different VM guests. This reduces memory
 460           usage with lots of guests but greatly increases kernel size.
 461           Also if a kernel was IPL'ed from a shared segment the kexec system
 462           call will not work.
 463           You should only select this option if you know what you are
 464           doing and want to exploit this feature.
 465
 466 config CMM
 467         def_tristate n
 468         prompt "Cooperative memory management"
 469         help
 470           Select this option, if you want to enable the kernel interface
 471           to reduce the memory size of the system. This is accomplished
 472           by allocating pages of memory and put them "on hold". This only
 473           makes sense for a system running under VM where the unused pages
 474           will be reused by VM for other guest systems. The interface
 475           allows an external monitor to balance memory of many systems.
 476           Everybody who wants to run Linux under VM should select this
 477           option.
 478
 479 config CMM_IUCV
 480         def_bool y
 481         prompt "IUCV special message interface to cooperative memory management"
 482         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 483         help
 484           Select this option to enable the special message interface to
 485           the cooperative memory management.
 486
 487 config APPLDATA_BASE
 488         def_bool n
 489         prompt "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         def_tristate m
 505         prompt "Monitor memory management statistics"
 506         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 507         help
 508           This provides memory management related data to the Linux - VM Monitor
 509           Stream, like paging/swapping rate, memory utilisation, etc.
 510           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 511           APPLDATA monitor record, i.e. enables or disables monitoring this record
 512           on the z/VM side.
 513
 514           Default is disabled.
 515           The /proc entry can also be read from, showing the current settings.
 516
 517           This can also be compiled as a module, which will be called
 518           appldata_mem.o.
 519
 520 config APPLDATA_OS
 521         def_tristate m
 522         prompt "Monitor OS statistics"
 523         depends on APPLDATA_BASE
 524         help
 525           This provides OS related data to the Linux - VM Monitor Stream, like
 526           CPU utilisation, etc.
 527           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 528           APPLDATA monitor record, i.e. enables or disables monitoring this record
 529           on the z/VM side.
 530
 531           Default is disabled.
 532           This can also be compiled as a module, which will be called
 533           appldata_os.o.
 534
 535 config APPLDATA_NET_SUM
 536         def_tristate m
 537         prompt "Monitor overall network statistics"
 538         depends on APPLDATA_BASE && NET
 539         help
 540           This provides network related data to the Linux - VM Monitor Stream,
 541           currently there is only a total sum of network I/O statistics, no
 542           per-interface data.
 543           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 544           APPLDATA monitor record, i.e. enables or disables monitoring this record
 545           on the z/VM side.
 546
 547           Default is disabled.
 548           This can also be compiled as a module, which will be called
 549           appldata_net_sum.o.
 550
 551 source kernel/Kconfig.hz
 552
 553 config S390_HYPFS_FS
 554         def_bool y
 555         prompt "s390 hypervisor file system support"
 556         select SYS_HYPERVISOR
 557         help
 558           This is a virtual file system intended to provide accounting
 559           information in an s390 hypervisor environment.
 560
 561 config KEXEC
 562         def_bool n
 563         prompt "kexec system call"
 564         help
 565           kexec is a system call that implements the ability to shutdown your
 566           current kernel, and to start another kernel.  It is like a reboot
 567           but is independent of hardware/microcode support.
 568
 569 config CRASH_DUMP
 570         bool "kernel crash dumps"
 571         depends on 64BIT
 572         select KEXEC
 573         help
 574           Generate crash dump after being started by kexec.
 575           Crash dump kernels are loaded in the main kernel with kexec-tools
 576           into a specially reserved region and then later executed after
 577           a crash by kdump/kexec.
 578           For more details see Documentation/kdump/kdump.txt
 579
 580 config ZFCPDUMP
 581         def_bool n
 582         prompt "zfcpdump support"
 583         select SMP
 584         help
 585           Select this option if you want to build an zfcpdump enabled kernel.
 586           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 587
 588 config S390_GUEST
 589         def_bool y
 590         prompt "s390 guest support for KVM (EXPERIMENTAL)"
 591         depends on 64BIT && EXPERIMENTAL
 592         select VIRTUALIZATION
 593         select VIRTIO
 594         select VIRTIO_RING
 595         select VIRTIO_CONSOLE
 596         help
 597           Select this option if you want to run the kernel as a guest under
 598           the KVM hypervisor. This will add detection for KVM as well  as a
 599           virtio transport. If KVM is detected, the virtio console will be
 600           the default console.
 601
 602 config SECCOMP
 603         def_bool y
 604         prompt "Enable seccomp to safely compute untrusted bytecode"
 605         depends on PROC_FS
 606         help
 607           This kernel feature is useful for number crunching applications
 608           that may need to compute untrusted bytecode during their
 609           execution. By using pipes or other transports made available to
 610           the process as file descriptors supporting the read/write
 611           syscalls, it's possible to isolate those applications in
 612           their own address space using seccomp. Once seccomp is
 613           enabled via /proc/<pid>/seccomp, it cannot be disabled
 614           and the task is only allowed to execute a few safe syscalls
 615           defined by each seccomp mode.
 616
 617           If unsure, say Y.
 618
 619 endmenu
 620
 621 menu "Power Management"
 622
 623 source "kernel/power/Kconfig"
 624
 625 endmenu
 626
 627 source "net/Kconfig"
 628
 629 config PCMCIA
 630         def_bool n
 631
 632 config CCW
 633         def_bool y
 634
 635 source "drivers/Kconfig"
 636
 637 source "fs/Kconfig"
 638
 639 source "arch/s390/Kconfig.debug"
 640
 641 source "security/Kconfig"
 642
 643 source "crypto/Kconfig"
 644
 645 source "lib/Kconfig"
 646
 647 source "arch/s390/kvm/Kconfig"