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 HAVE_KERNEL_GZIP
  85         select HAVE_KERNEL_BZIP2
  86         select HAVE_KERNEL_LZMA
  87         select HAVE_KERNEL_LZO
  88         select HAVE_KERNEL_XZ
  89         select HAVE_GET_USER_PAGES_FAST
  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_INLINE_SPIN_TRYLOCK
  94         select ARCH_INLINE_SPIN_TRYLOCK_BH
  95         select ARCH_INLINE_SPIN_LOCK
  96         select ARCH_INLINE_SPIN_LOCK_BH
  97         select ARCH_INLINE_SPIN_LOCK_IRQ
  98         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
  99         select ARCH_INLINE_SPIN_UNLOCK
 100         select ARCH_INLINE_SPIN_UNLOCK_BH
 101         select ARCH_INLINE_SPIN_UNLOCK_IRQ
 102         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
 103         select ARCH_INLINE_READ_TRYLOCK
 104         select ARCH_INLINE_READ_LOCK
 105         select ARCH_INLINE_READ_LOCK_BH
 106         select ARCH_INLINE_READ_LOCK_IRQ
 107         select ARCH_INLINE_READ_LOCK_IRQSAVE
 108         select ARCH_INLINE_READ_UNLOCK
 109         select ARCH_INLINE_READ_UNLOCK_BH
 110         select ARCH_INLINE_READ_UNLOCK_IRQ
 111         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
 112         select ARCH_INLINE_WRITE_TRYLOCK
 113         select ARCH_INLINE_WRITE_LOCK
 114         select ARCH_INLINE_WRITE_LOCK_BH
 115         select ARCH_INLINE_WRITE_LOCK_IRQ
 116         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 117         select ARCH_INLINE_WRITE_UNLOCK
 118         select ARCH_INLINE_WRITE_UNLOCK_BH
 119         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 120         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 121
 122 config SCHED_OMIT_FRAME_POINTER
 123         def_bool y
 124
 125 source "init/Kconfig"
 126
 127 source "kernel/Kconfig.freezer"
 128
 129 menu "Base setup"
 130
 131 comment "Processor type and features"
 132
 133 source "kernel/time/Kconfig"
 134
 135 config 64BIT
 136         def_bool y
 137         prompt "64 bit kernel"
 138         help
 139           Select this option if you have an IBM z/Architecture machine
 140           and want to use the 64 bit addressing mode.
 141
 142 config 32BIT
 143         def_bool y if !64BIT
 144
 145 config KTIME_SCALAR
 146         def_bool 32BIT
 147
 148 config SMP
 149         def_bool y
 150         prompt "Symmetric multi-processing support"
 151         ---help---
 152           This enables support for systems with more than one CPU. If you have
 153           a system with only one CPU, like most personal computers, say N. If
 154           you have a system with more than one CPU, say Y.
 155
 156           If you say N here, the kernel will run on single and multiprocessor
 157           machines, but will use only one CPU of a multiprocessor machine. If
 158           you say Y here, the kernel will run on many, but not all,
 159           singleprocessor machines. On a singleprocessor machine, the kernel
 160           will run faster if you say N here.
 161
 162           See also the SMP-HOWTO available at
 163           <http://www.tldp.org/docs.html#howto>.
 164
 165           Even if you don't know what to do here, say Y.
 166
 167 config NR_CPUS
 168         int "Maximum number of CPUs (2-64)"
 169         range 2 64
 170         depends on SMP
 171         default "32" if !64BIT
 172         default "64" if 64BIT
 173         help
 174           This allows you to specify the maximum number of CPUs which this
 175           kernel will support.  The maximum supported value is 64 and the
 176           minimum value which makes sense is 2.
 177
 178           This is purely to save memory - each supported CPU adds
 179           approximately sixteen kilobytes to the kernel image.
 180
 181 config HOTPLUG_CPU
 182         def_bool y
 183         prompt "Support for hot-pluggable CPUs"
 184         depends on SMP
 185         select HOTPLUG
 186         help
 187           Say Y here to be able to turn CPUs off and on. CPUs
 188           can be controlled through /sys/devices/system/cpu/cpu#.
 189           Say N if you want to disable CPU hotplug.
 190
 191 config SCHED_MC
 192         def_bool y
 193         prompt "Multi-core scheduler support"
 194         depends on SMP
 195         help
 196           Multi-core scheduler support improves the CPU scheduler's decision
 197           making when dealing with multi-core CPU chips at a cost of slightly
 198           increased overhead in some places.
 199
 200 config SCHED_BOOK
 201         def_bool y
 202         prompt "Book scheduler support"
 203         depends on SMP && SCHED_MC
 204         help
 205           Book scheduler support improves the CPU scheduler's decision making
 206           when dealing with machines that have several books.
 207
 208 config MATHEMU
 209         def_bool y
 210         prompt "IEEE FPU emulation"
 211         depends on MARCH_G5
 212         help
 213           This option is required for IEEE compliant floating point arithmetic
 214           on older ESA/390 machines. Say Y unless you know your machine doesn't
 215           need this.
 216
 217 config COMPAT
 218         def_bool y
 219         prompt "Kernel support for 31 bit emulation"
 220         depends on 64BIT
 221         select COMPAT_BINFMT_ELF
 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 AUDIT_ARCH
 232         def_bool y
 233
 234 comment "Code generation options"
 235
 236 choice
 237         prompt "Processor type"
 238         default MARCH_G5
 239
 240 config MARCH_G5
 241         bool "System/390 model G5 and G6"
 242         depends on !64BIT
 243         help
 244           Select this to build a 31 bit kernel that works
 245           on all ESA/390 and z/Architecture machines.
 246
 247 config MARCH_Z900
 248         bool "IBM zSeries model z800 and z900"
 249         help
 250           Select this to enable optimizations for model z800/z900 (2064 and
 251           2066 series). This will enable some optimizations that are not
 252           available on older ESA/390 (31 Bit) only CPUs.
 253
 254 config MARCH_Z990
 255         bool "IBM zSeries model z890 and z990"
 256         help
 257           Select this to enable optimizations for model z890/z990 (2084 and
 258           2086 series). The kernel will be slightly faster but will not work
 259           on older machines.
 260
 261 config MARCH_Z9_109
 262         bool "IBM System z9"
 263         help
 264           Select this to enable optimizations for IBM System z9 (2094 and
 265           2096 series). The kernel will be slightly faster but will not work
 266           on older machines.
 267
 268 config MARCH_Z10
 269         bool "IBM System z10"
 270         help
 271           Select this to enable optimizations for IBM System z10 (2097 and
 272           2098 series). The kernel will be slightly faster but will not work
 273           on older machines.
 274
 275 config MARCH_Z196
 276         bool "IBM zEnterprise 196"
 277         help
 278           Select this to enable optimizations for IBM zEnterprise 196
 279           (2817 series). The kernel will be slightly faster but will not work
 280           on older machines.
 281
 282 endchoice
 283
 284 config PACK_STACK
 285         def_bool y
 286         prompt "Pack kernel stack"
 287         help
 288           This option enables the compiler option -mkernel-backchain if it
 289           is available. If the option is available the compiler supports
 290           the new stack layout which dramatically reduces the minimum stack
 291           frame size. With an old compiler a non-leaf function needs a
 292           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 293           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 294           and 24 byte on 64 bit.
 295
 296           Say Y if you are unsure.
 297
 298 config SMALL_STACK
 299         def_bool n
 300         prompt "Use 8kb for kernel stack instead of 16kb"
 301         depends on PACK_STACK && 64BIT && !LOCKDEP
 302         help
 303           If you say Y here and the compiler supports the -mkernel-backchain
 304           option the kernel will use a smaller kernel stack size. The reduced
 305           size is 8kb instead of 16kb. This allows to run more threads on a
 306           system and reduces the pressure on the memory management for higher
 307           order page allocations.
 308
 309           Say N if you are unsure.
 310
 311 config CHECK_STACK
 312         def_bool y
 313         prompt "Detect kernel stack overflow"
 314         help
 315           This option enables the compiler option -mstack-guard and
 316           -mstack-size if they are available. If the compiler supports them
 317           it will emit additional code to each function prolog to trigger
 318           an illegal operation if the kernel stack is about to overflow.
 319
 320           Say N if you are unsure.
 321
 322 config STACK_GUARD
 323         int "Size of the guard area (128-1024)"
 324         range 128 1024
 325         depends on CHECK_STACK
 326         default "256"
 327         help
 328           This allows you to specify the size of the guard area at the lower
 329           end of the kernel stack. If the kernel stack points into the guard
 330           area on function entry an illegal operation is triggered. The size
 331           needs to be a power of 2. Please keep in mind that the size of an
 332           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 333           The minimum size for the stack guard should be 256 for 31 bit and
 334           512 for 64 bit.
 335
 336 config WARN_DYNAMIC_STACK
 337         def_bool n
 338         prompt "Emit compiler warnings for function with dynamic stack usage"
 339         help
 340           This option enables the compiler option -mwarn-dynamicstack. If the
 341           compiler supports this options generates warnings for functions
 342           that dynamically allocate stack space using alloca.
 343
 344           Say N if you are unsure.
 345
 346 config ARCH_POPULATES_NODE_MAP
 347         def_bool y
 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 ZFCPDUMP
 571         def_bool n
 572         prompt "zfcpdump support"
 573         select SMP
 574         help
 575           Select this option if you want to build an zfcpdump enabled kernel.
 576           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 577
 578 config S390_GUEST
 579         def_bool y
 580         prompt "s390 guest support for KVM (EXPERIMENTAL)"
 581         depends on 64BIT && EXPERIMENTAL
 582         select VIRTIO
 583         select VIRTIO_RING
 584         select VIRTIO_CONSOLE
 585         help
 586           Select this option if you want to run the kernel as a guest under
 587           the KVM hypervisor. This will add detection for KVM as well  as a
 588           virtio transport. If KVM is detected, the virtio console will be
 589           the default console.
 590
 591 config SECCOMP
 592         def_bool y
 593         prompt "Enable seccomp to safely compute untrusted bytecode"
 594         depends on PROC_FS
 595         help
 596           This kernel feature is useful for number crunching applications
 597           that may need to compute untrusted bytecode during their
 598           execution. By using pipes or other transports made available to
 599           the process as file descriptors supporting the read/write
 600           syscalls, it's possible to isolate those applications in
 601           their own address space using seccomp. Once seccomp is
 602           enabled via /proc/<pid>/seccomp, it cannot be disabled
 603           and the task is only allowed to execute a few safe syscalls
 604           defined by each seccomp mode.
 605
 606           If unsure, say Y.
 607
 608 endmenu
 609
 610 menu "Power Management"
 611
 612 source "kernel/power/Kconfig"
 613
 614 endmenu
 615
 616 source "net/Kconfig"
 617
 618 config PCMCIA
 619         def_bool n
 620
 621 config CCW
 622         def_bool y
 623
 624 source "drivers/Kconfig"
 625
 626 source "fs/Kconfig"
 627
 628 source "arch/s390/Kconfig.debug"
 629
 630 source "security/Kconfig"
 631
 632 source "crypto/Kconfig"
 633
 634 source "lib/Kconfig"
 635
 636 source "arch/s390/kvm/Kconfig"