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