arch/s390/Kconfig

   1 #
   2 # For a description of the syntax of this configuration file,
   3 # see Documentation/kbuild/kconfig-language.txt.
   4 #
   5
   6 config SCHED_MC
   7         def_bool y
   8         depends on SMP
   9
  10 config MMU
  11         def_bool y
  12
  13 config ZONE_DMA
  14         def_bool y
  15         depends on 64BIT
  16
  17 config LOCKDEP_SUPPORT
  18         def_bool y
  19
  20 config STACKTRACE_SUPPORT
  21         def_bool y
  22
  23 config HAVE_LATENCYTOP_SUPPORT
  24         def_bool y
  25
  26 config RWSEM_GENERIC_SPINLOCK
  27         bool
  28
  29 config RWSEM_XCHGADD_ALGORITHM
  30         def_bool y
  31
  32 config ARCH_HAS_ILOG2_U32
  33         bool
  34         default n
  35
  36 config ARCH_HAS_ILOG2_U64
  37         bool
  38         default n
  39
  40 config GENERIC_HWEIGHT
  41         def_bool y
  42
  43 config GENERIC_TIME_VSYSCALL
  44         def_bool y
  45
  46 config GENERIC_CLOCKEVENTS
  47         def_bool y
  48
  49 config GENERIC_BUG
  50         bool
  51         depends on BUG
  52         default y
  53
  54 config GENERIC_BUG_RELATIVE_POINTERS
  55         def_bool y
  56
  57 config NO_IOMEM
  58         def_bool y
  59
  60 config NO_DMA
  61         def_bool y
  62
  63 config GENERIC_LOCKBREAK
  64         bool
  65         default y
  66         depends on SMP && PREEMPT
  67
  68 config PGSTE
  69         bool
  70         default y if KVM
  71
  72 config VIRT_CPU_ACCOUNTING
  73         def_bool y
  74
  75 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  76         def_bool y
  77
  78 mainmenu "Linux Kernel Configuration"
  79
  80 config S390
  81         def_bool y
  82         select USE_GENERIC_SMP_HELPERS if SMP
  83         select HAVE_SYSCALL_WRAPPERS
  84         select HAVE_FUNCTION_TRACER
  85         select HAVE_FUNCTION_TRACE_MCOUNT_TEST
  86         select HAVE_FTRACE_MCOUNT_RECORD
  87         select HAVE_SYSCALL_TRACEPOINTS
  88         select HAVE_DYNAMIC_FTRACE
  89         select HAVE_FUNCTION_GRAPH_TRACER
  90         select HAVE_REGS_AND_STACK_ACCESS_API
  91         select HAVE_DEFAULT_NO_SPIN_MUTEXES
  92         select HAVE_OPROFILE
  93         select HAVE_KPROBES
  94         select HAVE_KRETPROBES
  95         select HAVE_KVM if 64BIT
  96         select HAVE_ARCH_TRACEHOOK
  97         select INIT_ALL_POSSIBLE
  98         select HAVE_PERF_EVENTS
  99         select HAVE_KERNEL_GZIP
 100         select HAVE_KERNEL_BZIP2
 101         select HAVE_KERNEL_LZMA
 102         select HAVE_KERNEL_LZO
 103         select ARCH_INLINE_SPIN_TRYLOCK
 104         select ARCH_INLINE_SPIN_TRYLOCK_BH
 105         select ARCH_INLINE_SPIN_LOCK
 106         select ARCH_INLINE_SPIN_LOCK_BH
 107         select ARCH_INLINE_SPIN_LOCK_IRQ
 108         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
 109         select ARCH_INLINE_SPIN_UNLOCK
 110         select ARCH_INLINE_SPIN_UNLOCK_BH
 111         select ARCH_INLINE_SPIN_UNLOCK_IRQ
 112         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
 113         select ARCH_INLINE_READ_TRYLOCK
 114         select ARCH_INLINE_READ_LOCK
 115         select ARCH_INLINE_READ_LOCK_BH
 116         select ARCH_INLINE_READ_LOCK_IRQ
 117         select ARCH_INLINE_READ_LOCK_IRQSAVE
 118         select ARCH_INLINE_READ_UNLOCK
 119         select ARCH_INLINE_READ_UNLOCK_BH
 120         select ARCH_INLINE_READ_UNLOCK_IRQ
 121         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
 122         select ARCH_INLINE_WRITE_TRYLOCK
 123         select ARCH_INLINE_WRITE_LOCK
 124         select ARCH_INLINE_WRITE_LOCK_BH
 125         select ARCH_INLINE_WRITE_LOCK_IRQ
 126         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 127         select ARCH_INLINE_WRITE_UNLOCK
 128         select ARCH_INLINE_WRITE_UNLOCK_BH
 129         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 130         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 131
 132 config SCHED_OMIT_FRAME_POINTER
 133         bool
 134         default y
 135
 136 source "init/Kconfig"
 137
 138 source "kernel/Kconfig.freezer"
 139
 140 menu "Base setup"
 141
 142 comment "Processor type and features"
 143
 144 source "kernel/time/Kconfig"
 145
 146 config 64BIT
 147         bool "64 bit kernel"
 148         help
 149           Select this option if you have a 64 bit IBM zSeries machine
 150           and want to use the 64 bit addressing mode.
 151
 152 config 32BIT
 153         bool
 154         default y if !64BIT
 155
 156 config KTIME_SCALAR
 157         def_bool 32BIT
 158
 159 config SMP
 160         bool "Symmetric multi-processing support"
 161         ---help---
 162           This enables support for systems with more than one CPU. If you have
 163           a system with only one CPU, like most personal computers, say N. If
 164           you have a system with more than one CPU, say Y.
 165
 166           If you say N here, the kernel will run on single and multiprocessor
 167           machines, but will use only one CPU of a multiprocessor machine. If
 168           you say Y here, the kernel will run on many, but not all,
 169           singleprocessor machines. On a singleprocessor machine, the kernel
 170           will run faster if you say N here.
 171
 172           See also the SMP-HOWTO available at
 173           <http://www.tldp.org/docs.html#howto>.
 174
 175           Even if you don't know what to do here, say Y.
 176
 177 config NR_CPUS
 178         int "Maximum number of CPUs (2-64)"
 179         range 2 64
 180         depends on SMP
 181         default "32" if !64BIT
 182         default "64" if 64BIT
 183         help
 184           This allows you to specify the maximum number of CPUs which this
 185           kernel will support.  The maximum supported value is 64 and the
 186           minimum value which makes sense is 2.
 187
 188           This is purely to save memory - each supported CPU adds
 189           approximately sixteen kilobytes to the kernel image.
 190
 191 config HOTPLUG_CPU
 192         bool "Support for hot-pluggable CPUs"
 193         depends on SMP
 194         select HOTPLUG
 195         default n
 196         help
 197           Say Y here to be able to turn CPUs off and on. CPUs
 198           can be controlled through /sys/devices/system/cpu/cpu#.
 199           Say N if you want to disable CPU hotplug.
 200
 201 config MATHEMU
 202         bool "IEEE FPU emulation"
 203         depends on MARCH_G5
 204         help
 205           This option is required for IEEE compliant floating point arithmetic
 206           on older S/390 machines. Say Y unless you know your machine doesn't
 207           need this.
 208
 209 config COMPAT
 210         bool "Kernel support for 31 bit emulation"
 211         depends on 64BIT
 212         select COMPAT_BINFMT_ELF
 213         help
 214           Select this option if you want to enable your system kernel to
 215           handle system-calls from ELF binaries for 31 bit ESA.  This option
 216           (and some other stuff like libraries and such) is needed for
 217           executing 31 bit applications.  It is safe to say "Y".
 218
 219 config SYSVIPC_COMPAT
 220         bool
 221         depends on COMPAT && SYSVIPC
 222         default y
 223
 224 config AUDIT_ARCH
 225         bool
 226         default y
 227
 228 config S390_EXEC_PROTECT
 229         bool "Data execute protection"
 230         help
 231           This option allows to enable a buffer overflow protection for user
 232           space programs and it also selects the addressing mode option above.
 233           The kernel parameter noexec=on will enable this feature and also
 234           switch the addressing modes, default is disabled. Enabling this (via
 235           kernel parameter) on machines earlier than IBM System z9-109 EC/BC
 236           will reduce system performance.
 237
 238 comment "Code generation options"
 239
 240 choice
 241         prompt "Processor type"
 242         default MARCH_G5
 243
 244 config MARCH_G5
 245         bool "S/390 model G5 and G6"
 246         depends on !64BIT
 247         help
 248           Select this to build a 31 bit kernel that works
 249           on all S/390 and zSeries machines.
 250
 251 config MARCH_Z900
 252         bool "IBM eServer zSeries model z800 and z900"
 253         help
 254           Select this to optimize for zSeries machines. This
 255           will enable some optimizations that are not available
 256           on older 31 bit only CPUs.
 257
 258 config MARCH_Z990
 259         bool "IBM eServer zSeries model z890 and z990"
 260         help
 261           Select this enable optimizations for model z890/z990.
 262           This will be slightly faster but does not work on
 263           older machines such as the z900.
 264
 265 config MARCH_Z9_109
 266         bool "IBM System z9"
 267         help
 268           Select this to enable optimizations for IBM System z9-109, IBM
 269           System z9 Enterprise Class (z9 EC), and IBM System z9 Business
 270           Class (z9 BC). The kernel will be slightly faster but will not
 271           work on older machines such as the z990, z890, z900, and z800.
 272
 273 config MARCH_Z10
 274         bool "IBM System z10"
 275         help
 276           Select this to enable optimizations for IBM System z10. The
 277           kernel will be slightly faster but will not work on older
 278           machines such as the z990, z890, z900, z800, z9-109, z9-ec
 279           and z9-bc.
 280
 281 endchoice
 282
 283 config PACK_STACK
 284         bool "Pack kernel stack"
 285         help
 286           This option enables the compiler option -mkernel-backchain if it
 287           is available. If the option is available the compiler supports
 288           the new stack layout which dramatically reduces the minimum stack
 289           frame size. With an old compiler a non-leaf function needs a
 290           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 291           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 292           and 24 byte on 64 bit.
 293
 294           Say Y if you are unsure.
 295
 296 config SMALL_STACK
 297         bool "Use 8kb for kernel stack instead of 16kb"
 298         depends on PACK_STACK && 64BIT && !LOCKDEP
 299         help
 300           If you say Y here and the compiler supports the -mkernel-backchain
 301           option the kernel will use a smaller kernel stack size. The reduced
 302           size is 8kb instead of 16kb. This allows to run more threads on a
 303           system and reduces the pressure on the memory management for higher
 304           order page allocations.
 305
 306           Say N if you are unsure.
 307
 308 config CHECK_STACK
 309         bool "Detect kernel stack overflow"
 310         help
 311           This option enables the compiler option -mstack-guard and
 312           -mstack-size if they are available. If the compiler supports them
 313           it will emit additional code to each function prolog to trigger
 314           an illegal operation if the kernel stack is about to overflow.
 315
 316           Say N if you are unsure.
 317
 318 config STACK_GUARD
 319         int "Size of the guard area (128-1024)"
 320         range 128 1024
 321         depends on CHECK_STACK
 322         default "256"
 323         help
 324           This allows you to specify the size of the guard area at the lower
 325           end of the kernel stack. If the kernel stack points into the guard
 326           area on function entry an illegal operation is triggered. The size
 327           needs to be a power of 2. Please keep in mind that the size of an
 328           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 329           The minimum size for the stack guard should be 256 for 31 bit and
 330           512 for 64 bit.
 331
 332 config WARN_STACK
 333         bool "Emit compiler warnings for function with broken stack usage"
 334         help
 335           This option enables the compiler options -mwarn-framesize and
 336           -mwarn-dynamicstack. If the compiler supports these options it
 337           will generate warnings for function which either use alloca or
 338           create a stack frame bigger than CONFIG_WARN_STACK_SIZE.
 339
 340           Say N if you are unsure.
 341
 342 config WARN_STACK_SIZE
 343         int "Maximum frame size considered safe (128-2048)"
 344         range 128 2048
 345         depends on WARN_STACK
 346         default "2048"
 347         help
 348           This allows you to specify the maximum frame size a function may
 349           have without the compiler complaining about it.
 350
 351 config ARCH_POPULATES_NODE_MAP
 352         def_bool y
 353
 354 comment "Kernel preemption"
 355
 356 source "kernel/Kconfig.preempt"
 357
 358 config ARCH_SPARSEMEM_ENABLE
 359         def_bool y
 360         select SPARSEMEM_VMEMMAP_ENABLE
 361         select SPARSEMEM_VMEMMAP
 362         select SPARSEMEM_STATIC if !64BIT
 363
 364 config ARCH_SPARSEMEM_DEFAULT
 365         def_bool y
 366
 367 config ARCH_SELECT_MEMORY_MODEL
 368        def_bool y
 369
 370 config ARCH_ENABLE_MEMORY_HOTPLUG
 371         def_bool y
 372         depends on SPARSEMEM
 373
 374 config ARCH_ENABLE_MEMORY_HOTREMOVE
 375         def_bool y
 376
 377 config ARCH_HIBERNATION_POSSIBLE
 378        def_bool y if 64BIT
 379
 380 source "mm/Kconfig"
 381
 382 comment "I/O subsystem configuration"
 383
 384 config QDIO
 385         tristate "QDIO support"
 386         ---help---
 387           This driver provides the Queued Direct I/O base support for
 388           IBM System z.
 389
 390           To compile this driver as a module, choose M here: the
 391           module will be called qdio.
 392
 393           If unsure, say Y.
 394
 395 config CHSC_SCH
 396         tristate "Support for CHSC subchannels"
 397         help
 398           This driver allows usage of CHSC subchannels. A CHSC subchannel
 399           is usually present on LPAR only.
 400           The driver creates a device /dev/chsc, which may be used to
 401           obtain I/O configuration information about the machine and
 402           to issue asynchronous chsc commands (DANGEROUS).
 403           You will usually only want to use this interface on a special
 404           LPAR designated for system management.
 405
 406           To compile this driver as a module, choose M here: the
 407           module will be called chsc_sch.
 408
 409           If unsure, say N.
 410
 411 comment "Misc"
 412
 413 config IPL
 414         bool "Builtin IPL record support"
 415         help
 416           If you want to use the produced kernel to IPL directly from a
 417           device, you have to merge a bootsector specific to the device
 418           into the first bytes of the kernel. You will have to select the
 419           IPL device.
 420
 421 choice
 422         prompt "IPL method generated into head.S"
 423         depends on IPL
 424         default IPL_VM
 425         help
 426           Select "tape" if you want to IPL the image from a Tape.
 427
 428           Select "vm_reader" if you are running under VM/ESA and want
 429           to IPL the image from the emulated card reader.
 430
 431 config IPL_TAPE
 432         bool "tape"
 433
 434 config IPL_VM
 435         bool "vm_reader"
 436
 437 endchoice
 438
 439 source "fs/Kconfig.binfmt"
 440
 441 config FORCE_MAX_ZONEORDER
 442         int
 443         default "9"
 444
 445 config PFAULT
 446         bool "Pseudo page fault support"
 447         help
 448           Select this option, if you want to use PFAULT pseudo page fault
 449           handling under VM. If running native or in LPAR, this option
 450           has no effect. If your VM does not support PFAULT, PAGEEX
 451           pseudo page fault handling will be used.
 452           Note that VM 4.2 supports PFAULT but has a bug in its
 453           implementation that causes some problems.
 454           Everybody who wants to run Linux under VM != VM4.2 should select
 455           this option.
 456
 457 config SHARED_KERNEL
 458         bool "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         tristate "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         bool "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         bool "Linux - VM Monitor Stream, base infrastructure"
 489         depends on PROC_FS
 490         help
 491           This provides a kernel interface for creating and updating z/VM APPLDATA
 492           monitor records. The monitor records are updated at certain time
 493           intervals, once the timer is started.
 494           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 495           i.e. enables or disables monitoring on the Linux side.
 496           A custom interval value (in seconds) can be written to
 497           /proc/appldata/interval.
 498
 499           Defaults are 60 seconds interval and timer off.
 500           The /proc entries can also be read from, showing the current settings.
 501
 502 config APPLDATA_MEM
 503         tristate "Monitor memory management statistics"
 504         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 505         help
 506           This provides memory management related data to the Linux - VM Monitor
 507           Stream, like paging/swapping rate, memory utilisation, etc.
 508           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 509           APPLDATA monitor record, i.e. enables or disables monitoring this record
 510           on the z/VM side.
 511
 512           Default is disabled.
 513           The /proc entry can also be read from, showing the current settings.
 514
 515           This can also be compiled as a module, which will be called
 516           appldata_mem.o.
 517
 518 config APPLDATA_OS
 519         tristate "Monitor OS statistics"
 520         depends on APPLDATA_BASE
 521         help
 522           This provides OS related data to the Linux - VM Monitor Stream, like
 523           CPU utilisation, etc.
 524           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 525           APPLDATA monitor record, i.e. enables or disables monitoring this record
 526           on the z/VM side.
 527
 528           Default is disabled.
 529           This can also be compiled as a module, which will be called
 530           appldata_os.o.
 531
 532 config APPLDATA_NET_SUM
 533         tristate "Monitor overall network statistics"
 534         depends on APPLDATA_BASE && NET
 535         help
 536           This provides network related data to the Linux - VM Monitor Stream,
 537           currently there is only a total sum of network I/O statistics, no
 538           per-interface data.
 539           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 540           APPLDATA monitor record, i.e. enables or disables monitoring this record
 541           on the z/VM side.
 542
 543           Default is disabled.
 544           This can also be compiled as a module, which will be called
 545           appldata_net_sum.o.
 546
 547 source kernel/Kconfig.hz
 548
 549 config S390_HYPFS_FS
 550         bool "s390 hypervisor file system support"
 551         select SYS_HYPERVISOR
 552         default y
 553         help
 554           This is a virtual file system intended to provide accounting
 555           information in an s390 hypervisor environment.
 556
 557 config KEXEC
 558         bool "kexec system call"
 559         help
 560           kexec is a system call that implements the ability to shutdown your
 561           current kernel, and to start another kernel.  It is like a reboot
 562           but is independent of hardware/microcode support.
 563
 564 config ZFCPDUMP
 565         bool "zfcpdump support"
 566         select SMP
 567         default n
 568         help
 569           Select this option if you want to build an zfcpdump enabled kernel.
 570           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 571
 572 config S390_GUEST
 573 bool "s390 guest support for KVM (EXPERIMENTAL)"
 574         depends on 64BIT && EXPERIMENTAL
 575         select VIRTIO
 576         select VIRTIO_RING
 577         select VIRTIO_CONSOLE
 578         help
 579           Select this option if you want to run the kernel as a guest under
 580           the KVM hypervisor. This will add detection for KVM as well  as a
 581           virtio transport. If KVM is detected, the virtio console will be
 582           the default console.
 583
 584 config SECCOMP
 585         bool "Enable seccomp to safely compute untrusted bytecode"
 586         depends on PROC_FS
 587         default y
 588         help
 589           This kernel feature is useful for number crunching applications
 590           that may need to compute untrusted bytecode during their
 591           execution. By using pipes or other transports made available to
 592           the process as file descriptors supporting the read/write
 593           syscalls, it's possible to isolate those applications in
 594           their own address space using seccomp. Once seccomp is
 595           enabled via /proc/<pid>/seccomp, it cannot be disabled
 596           and the task is only allowed to execute a few safe syscalls
 597           defined by each seccomp mode.
 598
 599           If unsure, say Y.
 600
 601 endmenu
 602
 603 menu "Power Management"
 604
 605 source "kernel/power/Kconfig"
 606
 607 endmenu
 608
 609 source "net/Kconfig"
 610
 611 config PCMCIA
 612         def_bool n
 613
 614 config CCW
 615         def_bool y
 616
 617 source "drivers/Kconfig"
 618
 619 source "fs/Kconfig"
 620
 621 source "arch/s390/Kconfig.debug"
 622
 623 source "security/Kconfig"
 624
 625 source "crypto/Kconfig"
 626
 627 source "lib/Kconfig"
 628
 629 source "arch/s390/kvm/Kconfig"