arch/s390/Kconfig

   1 config MMU
   2         def_bool y
   3
   4 config ZONE_DMA
   5         def_bool y
   6
   7 config LOCKDEP_SUPPORT
   8         def_bool y
   9
  10 config STACKTRACE_SUPPORT
  11         def_bool y
  12
  13 config HAVE_LATENCYTOP_SUPPORT
  14         def_bool y
  15
  16 config RWSEM_GENERIC_SPINLOCK
  17         bool
  18
  19 config RWSEM_XCHGADD_ALGORITHM
  20         def_bool y
  21
  22 config ARCH_HAS_ILOG2_U32
  23         def_bool n
  24
  25 config ARCH_HAS_ILOG2_U64
  26         def_bool n
  27
  28 config GENERIC_HWEIGHT
  29         def_bool y
  30
  31 config GENERIC_TIME_VSYSCALL
  32         def_bool y
  33
  34 config GENERIC_CLOCKEVENTS
  35         def_bool y
  36
  37 config GENERIC_BUG
  38         def_bool y if BUG
  39
  40 config GENERIC_BUG_RELATIVE_POINTERS
  41         def_bool y
  42
  43 config NO_IOMEM
  44         def_bool y
  45
  46 config NO_DMA
  47         def_bool y
  48
  49 config ARCH_DMA_ADDR_T_64BIT
  50         def_bool 64BIT
  51
  52 config GENERIC_LOCKBREAK
  53         def_bool y if SMP && PREEMPT
  54
  55 config PGSTE
  56         def_bool y if KVM
  57
  58 config VIRT_CPU_ACCOUNTING
  59         def_bool y
  60
  61 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  62         def_bool y
  63
  64 config S390
  65         def_bool y
  66         select USE_GENERIC_SMP_HELPERS if SMP
  67         select HAVE_SYSCALL_WRAPPERS
  68         select HAVE_FUNCTION_TRACER
  69         select HAVE_FUNCTION_TRACE_MCOUNT_TEST
  70         select HAVE_FTRACE_MCOUNT_RECORD
  71         select HAVE_C_RECORDMCOUNT
  72         select HAVE_SYSCALL_TRACEPOINTS
  73         select HAVE_DYNAMIC_FTRACE
  74         select HAVE_FUNCTION_GRAPH_TRACER
  75         select HAVE_REGS_AND_STACK_ACCESS_API
  76         select HAVE_OPROFILE
  77         select HAVE_KPROBES
  78         select HAVE_KRETPROBES
  79         select HAVE_KVM if 64BIT
  80         select HAVE_ARCH_TRACEHOOK
  81         select INIT_ALL_POSSIBLE
  82         select HAVE_IRQ_WORK
  83         select HAVE_PERF_EVENTS
  84         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  85         select HAVE_KERNEL_GZIP
  86         select HAVE_KERNEL_BZIP2
  87         select HAVE_KERNEL_LZMA
  88         select HAVE_KERNEL_LZO
  89         select HAVE_KERNEL_XZ
  90         select HAVE_GET_USER_PAGES_FAST
  91         select HAVE_ARCH_MUTEX_CPU_RELAX
  92         select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
  93         select HAVE_RCU_TABLE_FREE if SMP
  94         select ARCH_INLINE_SPIN_TRYLOCK
  95         select ARCH_INLINE_SPIN_TRYLOCK_BH
  96         select ARCH_INLINE_SPIN_LOCK
  97         select ARCH_INLINE_SPIN_LOCK_BH
  98         select ARCH_INLINE_SPIN_LOCK_IRQ
  99         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
 100         select ARCH_INLINE_SPIN_UNLOCK
 101         select ARCH_INLINE_SPIN_UNLOCK_BH
 102         select ARCH_INLINE_SPIN_UNLOCK_IRQ
 103         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
 104         select ARCH_INLINE_READ_TRYLOCK
 105         select ARCH_INLINE_READ_LOCK
 106         select ARCH_INLINE_READ_LOCK_BH
 107         select ARCH_INLINE_READ_LOCK_IRQ
 108         select ARCH_INLINE_READ_LOCK_IRQSAVE
 109         select ARCH_INLINE_READ_UNLOCK
 110         select ARCH_INLINE_READ_UNLOCK_BH
 111         select ARCH_INLINE_READ_UNLOCK_IRQ
 112         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
 113         select ARCH_INLINE_WRITE_TRYLOCK
 114         select ARCH_INLINE_WRITE_LOCK
 115         select ARCH_INLINE_WRITE_LOCK_BH
 116         select ARCH_INLINE_WRITE_LOCK_IRQ
 117         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 118         select ARCH_INLINE_WRITE_UNLOCK
 119         select ARCH_INLINE_WRITE_UNLOCK_BH
 120         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 121         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 122
 123 config SCHED_OMIT_FRAME_POINTER
 124         def_bool y
 125
 126 source "init/Kconfig"
 127
 128 source "kernel/Kconfig.freezer"
 129
 130 menu "Base setup"
 131
 132 comment "Processor type and features"
 133
 134 source "kernel/time/Kconfig"
 135
 136 config 64BIT
 137         def_bool y
 138         prompt "64 bit kernel"
 139         help
 140           Select this option if you have an IBM z/Architecture machine
 141           and want to use the 64 bit addressing mode.
 142
 143 config 32BIT
 144         def_bool y if !64BIT
 145
 146 config KTIME_SCALAR
 147         def_bool 32BIT
 148
 149 config SMP
 150         def_bool y
 151         prompt "Symmetric multi-processing support"
 152         ---help---
 153           This enables support for systems with more than one CPU. If you have
 154           a system with only one CPU, like most personal computers, say N. If
 155           you have a system with more than one CPU, say Y.
 156
 157           If you say N here, the kernel will run on single and multiprocessor
 158           machines, but will use only one CPU of a multiprocessor machine. If
 159           you say Y here, the kernel will run on many, but not all,
 160           singleprocessor machines. On a singleprocessor machine, the kernel
 161           will run faster if you say N here.
 162
 163           See also the SMP-HOWTO available at
 164           <http://www.tldp.org/docs.html#howto>.
 165
 166           Even if you don't know what to do here, say Y.
 167
 168 config NR_CPUS
 169         int "Maximum number of CPUs (2-64)"
 170         range 2 64
 171         depends on SMP
 172         default "32" if !64BIT
 173         default "64" if 64BIT
 174         help
 175           This allows you to specify the maximum number of CPUs which this
 176           kernel will support.  The maximum supported value is 64 and the
 177           minimum value which makes sense is 2.
 178
 179           This is purely to save memory - each supported CPU adds
 180           approximately sixteen kilobytes to the kernel image.
 181
 182 config HOTPLUG_CPU
 183         def_bool y
 184         prompt "Support for hot-pluggable CPUs"
 185         depends on SMP
 186         select HOTPLUG
 187         help
 188           Say Y here to be able to turn CPUs off and on. CPUs
 189           can be controlled through /sys/devices/system/cpu/cpu#.
 190           Say N if you want to disable CPU hotplug.
 191
 192 config SCHED_MC
 193         def_bool y
 194         prompt "Multi-core scheduler support"
 195         depends on SMP
 196         help
 197           Multi-core scheduler support improves the CPU scheduler's decision
 198           making when dealing with multi-core CPU chips at a cost of slightly
 199           increased overhead in some places.
 200
 201 config SCHED_BOOK
 202         def_bool y
 203         prompt "Book scheduler support"
 204         depends on SMP && SCHED_MC
 205         help
 206           Book scheduler support improves the CPU scheduler's decision making
 207           when dealing with machines that have several books.
 208
 209 config MATHEMU
 210         def_bool y
 211         prompt "IEEE FPU emulation"
 212         depends on MARCH_G5
 213         help
 214           This option is required for IEEE compliant floating point arithmetic
 215           on older ESA/390 machines. Say Y unless you know your machine doesn't
 216           need this.
 217
 218 config COMPAT
 219         def_bool y
 220         prompt "Kernel support for 31 bit emulation"
 221         depends on 64BIT
 222         select COMPAT_BINFMT_ELF
 223         help
 224           Select this option if you want to enable your system kernel to
 225           handle system-calls from ELF binaries for 31 bit ESA.  This option
 226           (and some other stuff like libraries and such) is needed for
 227           executing 31 bit applications.  It is safe to say "Y".
 228
 229 config SYSVIPC_COMPAT
 230         def_bool y if COMPAT && SYSVIPC
 231
 232 config AUDIT_ARCH
 233         def_bool y
 234
 235 comment "Code generation options"
 236
 237 choice
 238         prompt "Processor type"
 239         default MARCH_G5
 240
 241 config MARCH_G5
 242         bool "System/390 model G5 and G6"
 243         depends on !64BIT
 244         help
 245           Select this to build a 31 bit kernel that works
 246           on all ESA/390 and z/Architecture machines.
 247
 248 config MARCH_Z900
 249         bool "IBM zSeries model z800 and z900"
 250         help
 251           Select this to enable optimizations for model z800/z900 (2064 and
 252           2066 series). This will enable some optimizations that are not
 253           available on older ESA/390 (31 Bit) only CPUs.
 254
 255 config MARCH_Z990
 256         bool "IBM zSeries model z890 and z990"
 257         help
 258           Select this to enable optimizations for model z890/z990 (2084 and
 259           2086 series). The kernel will be slightly faster but will not work
 260           on older machines.
 261
 262 config MARCH_Z9_109
 263         bool "IBM System z9"
 264         help
 265           Select this to enable optimizations for IBM System z9 (2094 and
 266           2096 series). The kernel will be slightly faster but will not work
 267           on older machines.
 268
 269 config MARCH_Z10
 270         bool "IBM System z10"
 271         help
 272           Select this to enable optimizations for IBM System z10 (2097 and
 273           2098 series). The kernel will be slightly faster but will not work
 274           on older machines.
 275
 276 config MARCH_Z196
 277         bool "IBM zEnterprise 114 and 196"
 278         help
 279           Select this to enable optimizations for IBM zEnterprise 114 and 196
 280           (2818 and 2817 series). The kernel will be slightly faster but will
 281           not work on older machines.
 282
 283 endchoice
 284
 285 config PACK_STACK
 286         def_bool y
 287         prompt "Pack kernel stack"
 288         help
 289           This option enables the compiler option -mkernel-backchain if it
 290           is available. If the option is available the compiler supports
 291           the new stack layout which dramatically reduces the minimum stack
 292           frame size. With an old compiler a non-leaf function needs a
 293           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 294           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 295           and 24 byte on 64 bit.
 296
 297           Say Y if you are unsure.
 298
 299 config SMALL_STACK
 300         def_bool n
 301         prompt "Use 8kb for kernel stack instead of 16kb"
 302         depends on PACK_STACK && 64BIT && !LOCKDEP
 303         help
 304           If you say Y here and the compiler supports the -mkernel-backchain
 305           option the kernel will use a smaller kernel stack size. The reduced
 306           size is 8kb instead of 16kb. This allows to run more threads on a
 307           system and reduces the pressure on the memory management for higher
 308           order page allocations.
 309
 310           Say N if you are unsure.
 311
 312 config CHECK_STACK
 313         def_bool y
 314         prompt "Detect kernel stack overflow"
 315         help
 316           This option enables the compiler option -mstack-guard and
 317           -mstack-size if they are available. If the compiler supports them
 318           it will emit additional code to each function prolog to trigger
 319           an illegal operation if the kernel stack is about to overflow.
 320
 321           Say N if you are unsure.
 322
 323 config STACK_GUARD
 324         int "Size of the guard area (128-1024)"
 325         range 128 1024
 326         depends on CHECK_STACK
 327         default "256"
 328         help
 329           This allows you to specify the size of the guard area at the lower
 330           end of the kernel stack. If the kernel stack points into the guard
 331           area on function entry an illegal operation is triggered. The size
 332           needs to be a power of 2. Please keep in mind that the size of an
 333           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 334           The minimum size for the stack guard should be 256 for 31 bit and
 335           512 for 64 bit.
 336
 337 config WARN_DYNAMIC_STACK
 338         def_bool n
 339         prompt "Emit compiler warnings for function with dynamic stack usage"
 340         help
 341           This option enables the compiler option -mwarn-dynamicstack. If the
 342           compiler supports this options generates warnings for functions
 343           that dynamically allocate stack space using alloca.
 344
 345           Say N if you are unsure.
 346
 347 config ARCH_POPULATES_NODE_MAP
 348         def_bool y
 349
 350 comment "Kernel preemption"
 351
 352 source "kernel/Kconfig.preempt"
 353
 354 config ARCH_SPARSEMEM_ENABLE
 355         def_bool y
 356         select SPARSEMEM_VMEMMAP_ENABLE
 357         select SPARSEMEM_VMEMMAP
 358         select SPARSEMEM_STATIC if !64BIT
 359
 360 config ARCH_SPARSEMEM_DEFAULT
 361         def_bool y
 362
 363 config ARCH_SELECT_MEMORY_MODEL
 364         def_bool y
 365
 366 config ARCH_ENABLE_MEMORY_HOTPLUG
 367         def_bool y if SPARSEMEM
 368
 369 config ARCH_ENABLE_MEMORY_HOTREMOVE
 370         def_bool y
 371
 372 config ARCH_HIBERNATION_POSSIBLE
 373         def_bool y if 64BIT
 374
 375 source "mm/Kconfig"
 376
 377 comment "I/O subsystem configuration"
 378
 379 config QDIO
 380         def_tristate y
 381         prompt "QDIO support"
 382         ---help---
 383           This driver provides the Queued Direct I/O base support for
 384           IBM System z.
 385
 386           To compile this driver as a module, choose M here: the
 387           module will be called qdio.
 388
 389           If unsure, say Y.
 390
 391 config CHSC_SCH
 392         def_tristate m
 393         prompt "Support for CHSC subchannels"
 394         help
 395           This driver allows usage of CHSC subchannels. A CHSC subchannel
 396           is usually present on LPAR only.
 397           The driver creates a device /dev/chsc, which may be used to
 398           obtain I/O configuration information about the machine and
 399           to issue asynchronous chsc commands (DANGEROUS).
 400           You will usually only want to use this interface on a special
 401           LPAR designated for system management.
 402
 403           To compile this driver as a module, choose M here: the
 404           module will be called chsc_sch.
 405
 406           If unsure, say N.
 407
 408 comment "Misc"
 409
 410 config IPL
 411         def_bool y
 412         prompt "Builtin IPL record support"
 413         help
 414           If you want to use the produced kernel to IPL directly from a
 415           device, you have to merge a bootsector specific to the device
 416           into the first bytes of the kernel. You will have to select the
 417           IPL device.
 418
 419 choice
 420         prompt "IPL method generated into head.S"
 421         depends on IPL
 422         default IPL_VM
 423         help
 424           Select "tape" if you want to IPL the image from a Tape.
 425
 426           Select "vm_reader" if you are running under VM/ESA and want
 427           to IPL the image from the emulated card reader.
 428
 429 config IPL_TAPE
 430         bool "tape"
 431
 432 config IPL_VM
 433         bool "vm_reader"
 434
 435 endchoice
 436
 437 source "fs/Kconfig.binfmt"
 438
 439 config FORCE_MAX_ZONEORDER
 440         int
 441         default "9"
 442
 443 config PFAULT
 444         def_bool y
 445         prompt "Pseudo page fault support"
 446         help
 447           Select this option, if you want to use PFAULT pseudo page fault
 448           handling under VM. If running native or in LPAR, this option
 449           has no effect. If your VM does not support PFAULT, PAGEEX
 450           pseudo page fault handling will be used.
 451           Note that VM 4.2 supports PFAULT but has a bug in its
 452           implementation that causes some problems.
 453           Everybody who wants to run Linux under VM != VM4.2 should select
 454           this option.
 455
 456 config SHARED_KERNEL
 457         def_bool y
 458         prompt "VM shared kernel support"
 459         help
 460           Select this option, if you want to share the text segment of the
 461           Linux kernel between different VM guests. This reduces memory
 462           usage with lots of guests but greatly increases kernel size.
 463           Also if a kernel was IPL'ed from a shared segment the kexec system
 464           call will not work.
 465           You should only select this option if you know what you are
 466           doing and want to exploit this feature.
 467
 468 config CMM
 469         def_tristate n
 470         prompt "Cooperative memory management"
 471         help
 472           Select this option, if you want to enable the kernel interface
 473           to reduce the memory size of the system. This is accomplished
 474           by allocating pages of memory and put them "on hold". This only
 475           makes sense for a system running under VM where the unused pages
 476           will be reused by VM for other guest systems. The interface
 477           allows an external monitor to balance memory of many systems.
 478           Everybody who wants to run Linux under VM should select this
 479           option.
 480
 481 config CMM_IUCV
 482         def_bool y
 483         prompt "IUCV special message interface to cooperative memory management"
 484         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 485         help
 486           Select this option to enable the special message interface to
 487           the cooperative memory management.
 488
 489 config APPLDATA_BASE
 490         def_bool n
 491         prompt "Linux - VM Monitor Stream, base infrastructure"
 492         depends on PROC_FS
 493         help
 494           This provides a kernel interface for creating and updating z/VM APPLDATA
 495           monitor records. The monitor records are updated at certain time
 496           intervals, once the timer is started.
 497           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 498           i.e. enables or disables monitoring on the Linux side.
 499           A custom interval value (in seconds) can be written to
 500           /proc/appldata/interval.
 501
 502           Defaults are 60 seconds interval and timer off.
 503           The /proc entries can also be read from, showing the current settings.
 504
 505 config APPLDATA_MEM
 506         def_tristate m
 507         prompt "Monitor memory management statistics"
 508         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 509         help
 510           This provides memory management related data to the Linux - VM Monitor
 511           Stream, like paging/swapping rate, memory utilisation, etc.
 512           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 513           APPLDATA monitor record, i.e. enables or disables monitoring this record
 514           on the z/VM side.
 515
 516           Default is disabled.
 517           The /proc entry can also be read from, showing the current settings.
 518
 519           This can also be compiled as a module, which will be called
 520           appldata_mem.o.
 521
 522 config APPLDATA_OS
 523         def_tristate m
 524         prompt "Monitor OS statistics"
 525         depends on APPLDATA_BASE
 526         help
 527           This provides OS related data to the Linux - VM Monitor Stream, like
 528           CPU utilisation, etc.
 529           Writing 1 or 0 to /proc/appldata/os 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           This can also be compiled as a module, which will be called
 535           appldata_os.o.
 536
 537 config APPLDATA_NET_SUM
 538         def_tristate m
 539         prompt "Monitor overall network statistics"
 540         depends on APPLDATA_BASE && NET
 541         help
 542           This provides network related data to the Linux - VM Monitor Stream,
 543           currently there is only a total sum of network I/O statistics, no
 544           per-interface data.
 545           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 546           APPLDATA monitor record, i.e. enables or disables monitoring this record
 547           on the z/VM side.
 548
 549           Default is disabled.
 550           This can also be compiled as a module, which will be called
 551           appldata_net_sum.o.
 552
 553 source kernel/Kconfig.hz
 554
 555 config S390_HYPFS_FS
 556         def_bool y
 557         prompt "s390 hypervisor file system support"
 558         select SYS_HYPERVISOR
 559         help
 560           This is a virtual file system intended to provide accounting
 561           information in an s390 hypervisor environment.
 562
 563 config KEXEC
 564         def_bool n
 565         prompt "kexec system call"
 566         help
 567           kexec is a system call that implements the ability to shutdown your
 568           current kernel, and to start another kernel.  It is like a reboot
 569           but is independent of hardware/microcode support.
 570
 571 config ZFCPDUMP
 572         def_bool n
 573         prompt "zfcpdump support"
 574         select SMP
 575         help
 576           Select this option if you want to build an zfcpdump enabled kernel.
 577           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 578
 579 config S390_GUEST
 580         def_bool y
 581         prompt "s390 guest support for KVM (EXPERIMENTAL)"
 582         depends on 64BIT && EXPERIMENTAL
 583         select VIRTUALIZATION
 584         select VIRTIO
 585         select VIRTIO_RING
 586         select VIRTIO_CONSOLE
 587         help
 588           Select this option if you want to run the kernel as a guest under
 589           the KVM hypervisor. This will add detection for KVM as well  as a
 590           virtio transport. If KVM is detected, the virtio console will be
 591           the default console.
 592
 593 config SECCOMP
 594         def_bool y
 595         prompt "Enable seccomp to safely compute untrusted bytecode"
 596         depends on PROC_FS
 597         help
 598           This kernel feature is useful for number crunching applications
 599           that may need to compute untrusted bytecode during their
 600           execution. By using pipes or other transports made available to
 601           the process as file descriptors supporting the read/write
 602           syscalls, it's possible to isolate those applications in
 603           their own address space using seccomp. Once seccomp is
 604           enabled via /proc/<pid>/seccomp, it cannot be disabled
 605           and the task is only allowed to execute a few safe syscalls
 606           defined by each seccomp mode.
 607
 608           If unsure, say Y.
 609
 610 endmenu
 611
 612 menu "Power Management"
 613
 614 source "kernel/power/Kconfig"
 615
 616 endmenu
 617
 618 source "net/Kconfig"
 619
 620 config PCMCIA
 621         def_bool n
 622
 623 config CCW
 624         def_bool y
 625
 626 source "drivers/Kconfig"
 627
 628 source "fs/Kconfig"
 629
 630 source "arch/s390/Kconfig.debug"
 631
 632 source "security/Kconfig"
 633
 634 source "crypto/Kconfig"
 635
 636 source "lib/Kconfig"
 637
 638 source "arch/s390/kvm/Kconfig"