arch/s390/Kconfig

   1 config MMU
   2         def_bool y
   3
   4 config ZONE_DMA
   5         def_bool y if 64BIT
   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 HAVE_KERNEL_GZIP
  85         select HAVE_KERNEL_BZIP2
  86         select HAVE_KERNEL_LZMA
  87         select HAVE_KERNEL_LZO
  88         select HAVE_GET_USER_PAGES_FAST
  89         select HAVE_ARCH_MUTEX_CPU_RELAX
  90         select ARCH_INLINE_SPIN_TRYLOCK
  91         select ARCH_INLINE_SPIN_TRYLOCK_BH
  92         select ARCH_INLINE_SPIN_LOCK
  93         select ARCH_INLINE_SPIN_LOCK_BH
  94         select ARCH_INLINE_SPIN_LOCK_IRQ
  95         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
  96         select ARCH_INLINE_SPIN_UNLOCK
  97         select ARCH_INLINE_SPIN_UNLOCK_BH
  98         select ARCH_INLINE_SPIN_UNLOCK_IRQ
  99         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
 100         select ARCH_INLINE_READ_TRYLOCK
 101         select ARCH_INLINE_READ_LOCK
 102         select ARCH_INLINE_READ_LOCK_BH
 103         select ARCH_INLINE_READ_LOCK_IRQ
 104         select ARCH_INLINE_READ_LOCK_IRQSAVE
 105         select ARCH_INLINE_READ_UNLOCK
 106         select ARCH_INLINE_READ_UNLOCK_BH
 107         select ARCH_INLINE_READ_UNLOCK_IRQ
 108         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
 109         select ARCH_INLINE_WRITE_TRYLOCK
 110         select ARCH_INLINE_WRITE_LOCK
 111         select ARCH_INLINE_WRITE_LOCK_BH
 112         select ARCH_INLINE_WRITE_LOCK_IRQ
 113         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 114         select ARCH_INLINE_WRITE_UNLOCK
 115         select ARCH_INLINE_WRITE_UNLOCK_BH
 116         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 117         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 118
 119 config SCHED_OMIT_FRAME_POINTER
 120         def_bool y
 121
 122 source "init/Kconfig"
 123
 124 source "kernel/Kconfig.freezer"
 125
 126 menu "Base setup"
 127
 128 comment "Processor type and features"
 129
 130 source "kernel/time/Kconfig"
 131
 132 config 64BIT
 133         def_bool y
 134         prompt "64 bit kernel"
 135         help
 136           Select this option if you have an IBM z/Architecture machine
 137           and want to use the 64 bit addressing mode.
 138
 139 config 32BIT
 140         def_bool y if !64BIT
 141
 142 config KTIME_SCALAR
 143         def_bool 32BIT
 144
 145 config SMP
 146         def_bool y
 147         prompt "Symmetric multi-processing support"
 148         ---help---
 149           This enables support for systems with more than one CPU. If you have
 150           a system with only one CPU, like most personal computers, say N. If
 151           you have a system with more than one CPU, say Y.
 152
 153           If you say N here, the kernel will run on single and multiprocessor
 154           machines, but will use only one CPU of a multiprocessor machine. If
 155           you say Y here, the kernel will run on many, but not all,
 156           singleprocessor machines. On a singleprocessor machine, the kernel
 157           will run faster if you say N here.
 158
 159           See also the SMP-HOWTO available at
 160           <http://www.tldp.org/docs.html#howto>.
 161
 162           Even if you don't know what to do here, say Y.
 163
 164 config NR_CPUS
 165         int "Maximum number of CPUs (2-64)"
 166         range 2 64
 167         depends on SMP
 168         default "32" if !64BIT
 169         default "64" if 64BIT
 170         help
 171           This allows you to specify the maximum number of CPUs which this
 172           kernel will support.  The maximum supported value is 64 and the
 173           minimum value which makes sense is 2.
 174
 175           This is purely to save memory - each supported CPU adds
 176           approximately sixteen kilobytes to the kernel image.
 177
 178 config HOTPLUG_CPU
 179         def_bool y
 180         prompt "Support for hot-pluggable CPUs"
 181         depends on SMP
 182         select HOTPLUG
 183         help
 184           Say Y here to be able to turn CPUs off and on. CPUs
 185           can be controlled through /sys/devices/system/cpu/cpu#.
 186           Say N if you want to disable CPU hotplug.
 187
 188 config SCHED_MC
 189         def_bool y
 190         prompt "Multi-core scheduler support"
 191         depends on SMP
 192         help
 193           Multi-core scheduler support improves the CPU scheduler's decision
 194           making when dealing with multi-core CPU chips at a cost of slightly
 195           increased overhead in some places.
 196
 197 config SCHED_BOOK
 198         def_bool y
 199         prompt "Book scheduler support"
 200         depends on SMP && SCHED_MC
 201         help
 202           Book scheduler support improves the CPU scheduler's decision making
 203           when dealing with machines that have several books.
 204
 205 config MATHEMU
 206         def_bool y
 207         prompt "IEEE FPU emulation"
 208         depends on MARCH_G5
 209         help
 210           This option is required for IEEE compliant floating point arithmetic
 211           on older ESA/390 machines. Say Y unless you know your machine doesn't
 212           need this.
 213
 214 config COMPAT
 215         def_bool y
 216         prompt "Kernel support for 31 bit emulation"
 217         depends on 64BIT
 218         select COMPAT_BINFMT_ELF
 219         help
 220           Select this option if you want to enable your system kernel to
 221           handle system-calls from ELF binaries for 31 bit ESA.  This option
 222           (and some other stuff like libraries and such) is needed for
 223           executing 31 bit applications.  It is safe to say "Y".
 224
 225 config SYSVIPC_COMPAT
 226         def_bool y if COMPAT && SYSVIPC
 227
 228 config AUDIT_ARCH
 229         def_bool y
 230
 231 config S390_EXEC_PROTECT
 232         def_bool y
 233         prompt "Data execute protection"
 234         help
 235           This option allows to enable a buffer overflow protection for user
 236           space programs and it also selects the addressing mode option above.
 237           The kernel parameter noexec=on will enable this feature and also
 238           switch the addressing modes, default is disabled. Enabling this (via
 239           kernel parameter) on machines earlier than IBM System z9 this will
 240           reduce system performance.
 241
 242 comment "Code generation options"
 243
 244 choice
 245         prompt "Processor type"
 246         default MARCH_G5
 247
 248 config MARCH_G5
 249         bool "System/390 model G5 and G6"
 250         depends on !64BIT
 251         help
 252           Select this to build a 31 bit kernel that works
 253           on all ESA/390 and z/Architecture machines.
 254
 255 config MARCH_Z900
 256         bool "IBM zSeries model z800 and z900"
 257         help
 258           Select this to enable optimizations for model z800/z900 (2064 and
 259           2066 series). This will enable some optimizations that are not
 260           available on older ESA/390 (31 Bit) only CPUs.
 261
 262 config MARCH_Z990
 263         bool "IBM zSeries model z890 and z990"
 264         help
 265           Select this to enable optimizations for model z890/z990 (2084 and
 266           2086 series). The kernel will be slightly faster but will not work
 267           on older machines.
 268
 269 config MARCH_Z9_109
 270         bool "IBM System z9"
 271         help
 272           Select this to enable optimizations for IBM System z9 (2094 and
 273           2096 series). The kernel will be slightly faster but will not work
 274           on older machines.
 275
 276 config MARCH_Z10
 277         bool "IBM System z10"
 278         help
 279           Select this to enable optimizations for IBM System z10 (2097 and
 280           2098 series). The kernel will be slightly faster but will not work
 281           on older machines.
 282
 283 config MARCH_Z196
 284         bool "IBM zEnterprise 196"
 285         help
 286           Select this to enable optimizations for IBM zEnterprise 196
 287           (2817 series). The kernel will be slightly faster but will not work
 288           on older machines.
 289
 290 endchoice
 291
 292 config PACK_STACK
 293         def_bool y
 294         prompt "Pack kernel stack"
 295         help
 296           This option enables the compiler option -mkernel-backchain if it
 297           is available. If the option is available the compiler supports
 298           the new stack layout which dramatically reduces the minimum stack
 299           frame size. With an old compiler a non-leaf function needs a
 300           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 301           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 302           and 24 byte on 64 bit.
 303
 304           Say Y if you are unsure.
 305
 306 config SMALL_STACK
 307         def_bool n
 308         prompt "Use 8kb for kernel stack instead of 16kb"
 309         depends on PACK_STACK && 64BIT && !LOCKDEP
 310         help
 311           If you say Y here and the compiler supports the -mkernel-backchain
 312           option the kernel will use a smaller kernel stack size. The reduced
 313           size is 8kb instead of 16kb. This allows to run more threads on a
 314           system and reduces the pressure on the memory management for higher
 315           order page allocations.
 316
 317           Say N if you are unsure.
 318
 319 config CHECK_STACK
 320         def_bool y
 321         prompt "Detect kernel stack overflow"
 322         help
 323           This option enables the compiler option -mstack-guard and
 324           -mstack-size if they are available. If the compiler supports them
 325           it will emit additional code to each function prolog to trigger
 326           an illegal operation if the kernel stack is about to overflow.
 327
 328           Say N if you are unsure.
 329
 330 config STACK_GUARD
 331         int "Size of the guard area (128-1024)"
 332         range 128 1024
 333         depends on CHECK_STACK
 334         default "256"
 335         help
 336           This allows you to specify the size of the guard area at the lower
 337           end of the kernel stack. If the kernel stack points into the guard
 338           area on function entry an illegal operation is triggered. The size
 339           needs to be a power of 2. Please keep in mind that the size of an
 340           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 341           The minimum size for the stack guard should be 256 for 31 bit and
 342           512 for 64 bit.
 343
 344 config WARN_STACK
 345         def_bool n
 346         prompt "Emit compiler warnings for function with broken stack usage"
 347         help
 348           This option enables the compiler options -mwarn-framesize and
 349           -mwarn-dynamicstack. If the compiler supports these options it
 350           will generate warnings for function which either use alloca or
 351           create a stack frame bigger than CONFIG_WARN_STACK_SIZE.
 352
 353           Say N if you are unsure.
 354
 355 config WARN_STACK_SIZE
 356         int "Maximum frame size considered safe (128-2048)"
 357         range 128 2048
 358         depends on WARN_STACK
 359         default "2048"
 360         help
 361           This allows you to specify the maximum frame size a function may
 362           have without the compiler complaining about it.
 363
 364 config ARCH_POPULATES_NODE_MAP
 365         def_bool y
 366
 367 comment "Kernel preemption"
 368
 369 source "kernel/Kconfig.preempt"
 370
 371 config ARCH_SPARSEMEM_ENABLE
 372         def_bool y
 373         select SPARSEMEM_VMEMMAP_ENABLE
 374         select SPARSEMEM_VMEMMAP
 375         select SPARSEMEM_STATIC if !64BIT
 376
 377 config ARCH_SPARSEMEM_DEFAULT
 378         def_bool y
 379
 380 config ARCH_SELECT_MEMORY_MODEL
 381         def_bool y
 382
 383 config ARCH_ENABLE_MEMORY_HOTPLUG
 384         def_bool y if SPARSEMEM
 385
 386 config ARCH_ENABLE_MEMORY_HOTREMOVE
 387         def_bool y
 388
 389 config ARCH_HIBERNATION_POSSIBLE
 390         def_bool y if 64BIT
 391
 392 source "mm/Kconfig"
 393
 394 comment "I/O subsystem configuration"
 395
 396 config QDIO
 397         def_tristate y
 398         prompt "QDIO support"
 399         ---help---
 400           This driver provides the Queued Direct I/O base support for
 401           IBM System z.
 402
 403           To compile this driver as a module, choose M here: the
 404           module will be called qdio.
 405
 406           If unsure, say Y.
 407
 408 config CHSC_SCH
 409         def_tristate y
 410         prompt "Support for CHSC subchannels"
 411         help
 412           This driver allows usage of CHSC subchannels. A CHSC subchannel
 413           is usually present on LPAR only.
 414           The driver creates a device /dev/chsc, which may be used to
 415           obtain I/O configuration information about the machine and
 416           to issue asynchronous chsc commands (DANGEROUS).
 417           You will usually only want to use this interface on a special
 418           LPAR designated for system management.
 419
 420           To compile this driver as a module, choose M here: the
 421           module will be called chsc_sch.
 422
 423           If unsure, say N.
 424
 425 comment "Misc"
 426
 427 config IPL
 428         def_bool y
 429         prompt "Builtin IPL record support"
 430         help
 431           If you want to use the produced kernel to IPL directly from a
 432           device, you have to merge a bootsector specific to the device
 433           into the first bytes of the kernel. You will have to select the
 434           IPL device.
 435
 436 choice
 437         prompt "IPL method generated into head.S"
 438         depends on IPL
 439         default IPL_VM
 440         help
 441           Select "tape" if you want to IPL the image from a Tape.
 442
 443           Select "vm_reader" if you are running under VM/ESA and want
 444           to IPL the image from the emulated card reader.
 445
 446 config IPL_TAPE
 447         bool "tape"
 448
 449 config IPL_VM
 450         bool "vm_reader"
 451
 452 endchoice
 453
 454 source "fs/Kconfig.binfmt"
 455
 456 config FORCE_MAX_ZONEORDER
 457         int
 458         default "9"
 459
 460 config PFAULT
 461         def_bool y
 462         prompt "Pseudo page fault support"
 463         help
 464           Select this option, if you want to use PFAULT pseudo page fault
 465           handling under VM. If running native or in LPAR, this option
 466           has no effect. If your VM does not support PFAULT, PAGEEX
 467           pseudo page fault handling will be used.
 468           Note that VM 4.2 supports PFAULT but has a bug in its
 469           implementation that causes some problems.
 470           Everybody who wants to run Linux under VM != VM4.2 should select
 471           this option.
 472
 473 config SHARED_KERNEL
 474         def_bool y
 475         prompt "VM shared kernel support"
 476         help
 477           Select this option, if you want to share the text segment of the
 478           Linux kernel between different VM guests. This reduces memory
 479           usage with lots of guests but greatly increases kernel size.
 480           Also if a kernel was IPL'ed from a shared segment the kexec system
 481           call will not work.
 482           You should only select this option if you know what you are
 483           doing and want to exploit this feature.
 484
 485 config CMM
 486         def_tristate n
 487         prompt "Cooperative memory management"
 488         help
 489           Select this option, if you want to enable the kernel interface
 490           to reduce the memory size of the system. This is accomplished
 491           by allocating pages of memory and put them "on hold". This only
 492           makes sense for a system running under VM where the unused pages
 493           will be reused by VM for other guest systems. The interface
 494           allows an external monitor to balance memory of many systems.
 495           Everybody who wants to run Linux under VM should select this
 496           option.
 497
 498 config CMM_IUCV
 499         def_bool y
 500         prompt "IUCV special message interface to cooperative memory management"
 501         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 502         help
 503           Select this option to enable the special message interface to
 504           the cooperative memory management.
 505
 506 config APPLDATA_BASE
 507         def_bool n
 508         prompt "Linux - VM Monitor Stream, base infrastructure"
 509         depends on PROC_FS
 510         help
 511           This provides a kernel interface for creating and updating z/VM APPLDATA
 512           monitor records. The monitor records are updated at certain time
 513           intervals, once the timer is started.
 514           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 515           i.e. enables or disables monitoring on the Linux side.
 516           A custom interval value (in seconds) can be written to
 517           /proc/appldata/interval.
 518
 519           Defaults are 60 seconds interval and timer off.
 520           The /proc entries can also be read from, showing the current settings.
 521
 522 config APPLDATA_MEM
 523         def_tristate m
 524         prompt "Monitor memory management statistics"
 525         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 526         help
 527           This provides memory management related data to the Linux - VM Monitor
 528           Stream, like paging/swapping rate, memory utilisation, etc.
 529           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 530           APPLDATA monitor record, i.e. enables or disables monitoring this record
 531           on the z/VM side.
 532
 533           Default is disabled.
 534           The /proc entry can also be read from, showing the current settings.
 535
 536           This can also be compiled as a module, which will be called
 537           appldata_mem.o.
 538
 539 config APPLDATA_OS
 540         def_tristate m
 541         prompt "Monitor OS statistics"
 542         depends on APPLDATA_BASE
 543         help
 544           This provides OS related data to the Linux - VM Monitor Stream, like
 545           CPU utilisation, etc.
 546           Writing 1 or 0 to /proc/appldata/os 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_os.o.
 553
 554 config APPLDATA_NET_SUM
 555         def_tristate m
 556         prompt "Monitor overall network statistics"
 557         depends on APPLDATA_BASE && NET
 558         help
 559           This provides network related data to the Linux - VM Monitor Stream,
 560           currently there is only a total sum of network I/O statistics, no
 561           per-interface data.
 562           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 563           APPLDATA monitor record, i.e. enables or disables monitoring this record
 564           on the z/VM side.
 565
 566           Default is disabled.
 567           This can also be compiled as a module, which will be called
 568           appldata_net_sum.o.
 569
 570 source kernel/Kconfig.hz
 571
 572 config S390_HYPFS_FS
 573         def_bool y
 574         prompt "s390 hypervisor file system support"
 575         select SYS_HYPERVISOR
 576         help
 577           This is a virtual file system intended to provide accounting
 578           information in an s390 hypervisor environment.
 579
 580 config KEXEC
 581         def_bool n
 582         prompt "kexec system call"
 583         help
 584           kexec is a system call that implements the ability to shutdown your
 585           current kernel, and to start another kernel.  It is like a reboot
 586           but is independent of hardware/microcode support.
 587
 588 config ZFCPDUMP
 589         def_bool n
 590         prompt "zfcpdump support"
 591         select SMP
 592         help
 593           Select this option if you want to build an zfcpdump enabled kernel.
 594           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 595
 596 config S390_GUEST
 597         def_bool y
 598         prompt "s390 guest support for KVM (EXPERIMENTAL)"
 599         depends on 64BIT && EXPERIMENTAL
 600         select VIRTIO
 601         select VIRTIO_RING
 602         select VIRTIO_CONSOLE
 603         help
 604           Select this option if you want to run the kernel as a guest under
 605           the KVM hypervisor. This will add detection for KVM as well  as a
 606           virtio transport. If KVM is detected, the virtio console will be
 607           the default console.
 608
 609 config SECCOMP
 610         def_bool y
 611         prompt "Enable seccomp to safely compute untrusted bytecode"
 612         depends on PROC_FS
 613         help
 614           This kernel feature is useful for number crunching applications
 615           that may need to compute untrusted bytecode during their
 616           execution. By using pipes or other transports made available to
 617           the process as file descriptors supporting the read/write
 618           syscalls, it's possible to isolate those applications in
 619           their own address space using seccomp. Once seccomp is
 620           enabled via /proc/<pid>/seccomp, it cannot be disabled
 621           and the task is only allowed to execute a few safe syscalls
 622           defined by each seccomp mode.
 623
 624           If unsure, say Y.
 625
 626 endmenu
 627
 628 menu "Power Management"
 629
 630 source "kernel/power/Kconfig"
 631
 632 endmenu
 633
 634 source "net/Kconfig"
 635
 636 config PCMCIA
 637         def_bool n
 638
 639 config CCW
 640         def_bool y
 641
 642 source "drivers/Kconfig"
 643
 644 source "fs/Kconfig"
 645
 646 source "arch/s390/Kconfig.debug"
 647
 648 source "security/Kconfig"
 649
 650 source "crypto/Kconfig"
 651
 652 source "lib/Kconfig"
 653
 654 source "arch/s390/kvm/Kconfig"