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_BUG
  32         def_bool y if BUG
  33
  34 config GENERIC_BUG_RELATIVE_POINTERS
  35         def_bool y
  36
  37 config NO_IOMEM
  38         def_bool y
  39
  40 config NO_DMA
  41         def_bool y
  42
  43 config ARCH_DMA_ADDR_T_64BIT
  44         def_bool 64BIT
  45
  46 config GENERIC_LOCKBREAK
  47         def_bool y if SMP && PREEMPT
  48
  49 config PGSTE
  50         def_bool y if KVM
  51
  52 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  53         def_bool y
  54
  55 config KEXEC
  56         def_bool y
  57
  58 config AUDIT_ARCH
  59         def_bool y
  60
  61 config S390
  62         def_bool y
  63         select USE_GENERIC_SMP_HELPERS if SMP
  64         select GENERIC_CPU_DEVICES if !SMP
  65         select HAVE_SYSCALL_WRAPPERS
  66         select HAVE_FUNCTION_TRACER
  67         select HAVE_FUNCTION_TRACE_MCOUNT_TEST
  68         select HAVE_FTRACE_MCOUNT_RECORD
  69         select HAVE_C_RECORDMCOUNT
  70         select HAVE_SYSCALL_TRACEPOINTS
  71         select SYSCTL_EXCEPTION_TRACE
  72         select HAVE_DYNAMIC_FTRACE
  73         select HAVE_FUNCTION_GRAPH_TRACER
  74         select HAVE_REGS_AND_STACK_ACCESS_API
  75         select HAVE_OPROFILE
  76         select HAVE_KPROBES
  77         select HAVE_KRETPROBES
  78         select HAVE_KVM if 64BIT
  79         select HAVE_ARCH_TRACEHOOK
  80         select INIT_ALL_POSSIBLE
  81         select HAVE_IRQ_WORK
  82         select HAVE_PERF_EVENTS
  83         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  84         select HAVE_DEBUG_KMEMLEAK
  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_ARCH_MUTEX_CPU_RELAX
  91         select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
  92         select HAVE_BPF_JIT if 64BIT && PACK_STACK
  93         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
  94         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  95         select HAVE_MEMBLOCK
  96         select HAVE_MEMBLOCK_NODE_MAP
  97         select HAVE_CMPXCHG_LOCAL
  98         select HAVE_CMPXCHG_DOUBLE
  99         select HAVE_VIRT_CPU_ACCOUNTING
 100         select VIRT_CPU_ACCOUNTING
 101         select ARCH_DISCARD_MEMBLOCK
 102         select BUILDTIME_EXTABLE_SORT
 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         select HAVE_UID16 if 32BIT
 132         select ARCH_WANT_IPC_PARSE_VERSION
 133         select GENERIC_SMP_IDLE_THREAD
 134         select GENERIC_TIME_VSYSCALL
 135         select GENERIC_CLOCKEVENTS
 136         select KTIME_SCALAR if 32BIT
 137         select HAVE_ARCH_SECCOMP_FILTER
 138         select GENERIC_KERNEL_THREAD
 139
 140 config SCHED_OMIT_FRAME_POINTER
 141         def_bool y
 142
 143 source "init/Kconfig"
 144
 145 source "kernel/Kconfig.freezer"
 146
 147 menu "Processor type and features"
 148
 149 config HAVE_MARCH_Z900_FEATURES
 150         def_bool n
 151
 152 config HAVE_MARCH_Z990_FEATURES
 153         def_bool n
 154         select HAVE_MARCH_Z900_FEATURES
 155
 156 config HAVE_MARCH_Z9_109_FEATURES
 157         def_bool n
 158         select HAVE_MARCH_Z990_FEATURES
 159
 160 config HAVE_MARCH_Z10_FEATURES
 161         def_bool n
 162         select HAVE_MARCH_Z9_109_FEATURES
 163
 164 config HAVE_MARCH_Z196_FEATURES
 165         def_bool n
 166         select HAVE_MARCH_Z10_FEATURES
 167
 168 choice
 169         prompt "Processor type"
 170         default MARCH_G5
 171
 172 config MARCH_G5
 173         bool "System/390 model G5 and G6"
 174         depends on !64BIT
 175         help
 176           Select this to build a 31 bit kernel that works
 177           on all ESA/390 and z/Architecture machines.
 178
 179 config MARCH_Z900
 180         bool "IBM zSeries model z800 and z900"
 181         select HAVE_MARCH_Z900_FEATURES if 64BIT
 182         help
 183           Select this to enable optimizations for model z800/z900 (2064 and
 184           2066 series). This will enable some optimizations that are not
 185           available on older ESA/390 (31 Bit) only CPUs.
 186
 187 config MARCH_Z990
 188         bool "IBM zSeries model z890 and z990"
 189         select HAVE_MARCH_Z990_FEATURES if 64BIT
 190         help
 191           Select this to enable optimizations for model z890/z990 (2084 and
 192           2086 series). The kernel will be slightly faster but will not work
 193           on older machines.
 194
 195 config MARCH_Z9_109
 196         bool "IBM System z9"
 197         select HAVE_MARCH_Z9_109_FEATURES if 64BIT
 198         help
 199           Select this to enable optimizations for IBM System z9 (2094 and
 200           2096 series). The kernel will be slightly faster but will not work
 201           on older machines.
 202
 203 config MARCH_Z10
 204         bool "IBM System z10"
 205         select HAVE_MARCH_Z10_FEATURES if 64BIT
 206         help
 207           Select this to enable optimizations for IBM System z10 (2097 and
 208           2098 series). The kernel will be slightly faster but will not work
 209           on older machines.
 210
 211 config MARCH_Z196
 212         bool "IBM zEnterprise 114 and 196"
 213         select HAVE_MARCH_Z196_FEATURES if 64BIT
 214         help
 215           Select this to enable optimizations for IBM zEnterprise 114 and 196
 216           (2818 and 2817 series). The kernel will be slightly faster but will
 217           not work on older machines.
 218
 219 endchoice
 220
 221 config 64BIT
 222         def_bool y
 223         prompt "64 bit kernel"
 224         help
 225           Select this option if you have an IBM z/Architecture machine
 226           and want to use the 64 bit addressing mode.
 227
 228 config 32BIT
 229         def_bool y if !64BIT
 230
 231 config COMPAT
 232         def_bool y
 233         prompt "Kernel support for 31 bit emulation"
 234         depends on 64BIT
 235         select COMPAT_BINFMT_ELF if BINFMT_ELF
 236         select ARCH_WANT_OLD_COMPAT_IPC
 237         help
 238           Select this option if you want to enable your system kernel to
 239           handle system-calls from ELF binaries for 31 bit ESA.  This option
 240           (and some other stuff like libraries and such) is needed for
 241           executing 31 bit applications.  It is safe to say "Y".
 242
 243 config SYSVIPC_COMPAT
 244         def_bool y if COMPAT && SYSVIPC
 245
 246 config KEYS_COMPAT
 247         def_bool y if COMPAT && KEYS
 248
 249 config SMP
 250         def_bool y
 251         prompt "Symmetric multi-processing support"
 252         ---help---
 253           This enables support for systems with more than one CPU. If you have
 254           a system with only one CPU, like most personal computers, say N. If
 255           you have a system with more than one CPU, say Y.
 256
 257           If you say N here, the kernel will run on single and multiprocessor
 258           machines, but will use only one CPU of a multiprocessor machine. If
 259           you say Y here, the kernel will run on many, but not all,
 260           singleprocessor machines. On a singleprocessor machine, the kernel
 261           will run faster if you say N here.
 262
 263           See also the SMP-HOWTO available at
 264           <http://www.tldp.org/docs.html#howto>.
 265
 266           Even if you don't know what to do here, say Y.
 267
 268 config NR_CPUS
 269         int "Maximum number of CPUs (2-64)"
 270         range 2 64
 271         depends on SMP
 272         default "32" if !64BIT
 273         default "64" if 64BIT
 274         help
 275           This allows you to specify the maximum number of CPUs which this
 276           kernel will support.  The maximum supported value is 64 and the
 277           minimum value which makes sense is 2.
 278
 279           This is purely to save memory - each supported CPU adds
 280           approximately sixteen kilobytes to the kernel image.
 281
 282 config HOTPLUG_CPU
 283         def_bool y
 284         prompt "Support for hot-pluggable CPUs"
 285         depends on SMP
 286         select HOTPLUG
 287         help
 288           Say Y here to be able to turn CPUs off and on. CPUs
 289           can be controlled through /sys/devices/system/cpu/cpu#.
 290           Say N if you want to disable CPU hotplug.
 291
 292 config SCHED_MC
 293         def_bool n
 294
 295 config SCHED_BOOK
 296         def_bool y
 297         prompt "Book scheduler support"
 298         depends on SMP
 299         select SCHED_MC
 300         help
 301           Book scheduler support improves the CPU scheduler's decision making
 302           when dealing with machines that have several books.
 303
 304 source kernel/Kconfig.preempt
 305
 306 config MATHEMU
 307         def_bool y
 308         prompt "IEEE FPU emulation"
 309         depends on MARCH_G5
 310         help
 311           This option is required for IEEE compliant floating point arithmetic
 312           on older ESA/390 machines. Say Y unless you know your machine doesn't
 313           need this.
 314
 315 source kernel/Kconfig.hz
 316
 317 endmenu
 318
 319 menu "Memory setup"
 320
 321 config ARCH_SPARSEMEM_ENABLE
 322         def_bool y
 323         select SPARSEMEM_VMEMMAP_ENABLE
 324         select SPARSEMEM_VMEMMAP
 325         select SPARSEMEM_STATIC if !64BIT
 326
 327 config ARCH_SPARSEMEM_DEFAULT
 328         def_bool y
 329
 330 config ARCH_SELECT_MEMORY_MODEL
 331         def_bool y
 332
 333 config ARCH_ENABLE_MEMORY_HOTPLUG
 334         def_bool y if SPARSEMEM
 335
 336 config ARCH_ENABLE_MEMORY_HOTREMOVE
 337         def_bool y
 338
 339 config FORCE_MAX_ZONEORDER
 340         int
 341         default "9"
 342
 343 source "mm/Kconfig"
 344
 345 config PACK_STACK
 346         def_bool y
 347         prompt "Pack kernel stack"
 348         help
 349           This option enables the compiler option -mkernel-backchain if it
 350           is available. If the option is available the compiler supports
 351           the new stack layout which dramatically reduces the minimum stack
 352           frame size. With an old compiler a non-leaf function needs a
 353           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 354           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 355           and 24 byte on 64 bit.
 356
 357           Say Y if you are unsure.
 358
 359 config SMALL_STACK
 360         def_bool n
 361         prompt "Use 8kb for kernel stack instead of 16kb"
 362         depends on PACK_STACK && 64BIT && !LOCKDEP
 363         help
 364           If you say Y here and the compiler supports the -mkernel-backchain
 365           option the kernel will use a smaller kernel stack size. The reduced
 366           size is 8kb instead of 16kb. This allows to run more threads on a
 367           system and reduces the pressure on the memory management for higher
 368           order page allocations.
 369
 370           Say N if you are unsure.
 371
 372 config CHECK_STACK
 373         def_bool y
 374         prompt "Detect kernel stack overflow"
 375         help
 376           This option enables the compiler option -mstack-guard and
 377           -mstack-size if they are available. If the compiler supports them
 378           it will emit additional code to each function prolog to trigger
 379           an illegal operation if the kernel stack is about to overflow.
 380
 381           Say N if you are unsure.
 382
 383 config STACK_GUARD
 384         int "Size of the guard area (128-1024)"
 385         range 128 1024
 386         depends on CHECK_STACK
 387         default "256"
 388         help
 389           This allows you to specify the size of the guard area at the lower
 390           end of the kernel stack. If the kernel stack points into the guard
 391           area on function entry an illegal operation is triggered. The size
 392           needs to be a power of 2. Please keep in mind that the size of an
 393           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 394           The minimum size for the stack guard should be 256 for 31 bit and
 395           512 for 64 bit.
 396
 397 config WARN_DYNAMIC_STACK
 398         def_bool n
 399         prompt "Emit compiler warnings for function with dynamic stack usage"
 400         help
 401           This option enables the compiler option -mwarn-dynamicstack. If the
 402           compiler supports this options generates warnings for functions
 403           that dynamically allocate stack space using alloca.
 404
 405           Say N if you are unsure.
 406
 407 endmenu
 408
 409 menu "I/O subsystem"
 410
 411 config QDIO
 412         def_tristate y
 413         prompt "QDIO support"
 414         ---help---
 415           This driver provides the Queued Direct I/O base support for
 416           IBM System z.
 417
 418           To compile this driver as a module, choose M here: the
 419           module will be called qdio.
 420
 421           If unsure, say Y.
 422
 423 config CHSC_SCH
 424         def_tristate m
 425         prompt "Support for CHSC subchannels"
 426         help
 427           This driver allows usage of CHSC subchannels. A CHSC subchannel
 428           is usually present on LPAR only.
 429           The driver creates a device /dev/chsc, which may be used to
 430           obtain I/O configuration information about the machine and
 431           to issue asynchronous chsc commands (DANGEROUS).
 432           You will usually only want to use this interface on a special
 433           LPAR designated for system management.
 434
 435           To compile this driver as a module, choose M here: the
 436           module will be called chsc_sch.
 437
 438           If unsure, say N.
 439
 440 config SCM_BUS
 441         def_bool y
 442         depends on 64BIT
 443         prompt "SCM bus driver"
 444         help
 445           Bus driver for Storage Class Memory.
 446
 447 config EADM_SCH
 448         def_tristate m
 449         prompt "Support for EADM subchannels"
 450         depends on SCM_BUS
 451         help
 452           This driver allows usage of EADM subchannels. EADM subchannels act
 453           as a communication vehicle for SCM increments.
 454
 455           To compile this driver as a module, choose M here: the
 456           module will be called eadm_sch.
 457
 458 endmenu
 459
 460 menu "Dump support"
 461
 462 config CRASH_DUMP
 463         bool "kernel crash dumps"
 464         depends on 64BIT && SMP
 465         select KEXEC
 466         help
 467           Generate crash dump after being started by kexec.
 468           Crash dump kernels are loaded in the main kernel with kexec-tools
 469           into a specially reserved region and then later executed after
 470           a crash by kdump/kexec.
 471           For more details see Documentation/kdump/kdump.txt
 472
 473 config ZFCPDUMP
 474         def_bool n
 475         prompt "zfcpdump support"
 476         select SMP
 477         help
 478           Select this option if you want to build an zfcpdump enabled kernel.
 479           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 480
 481 endmenu
 482
 483 menu "Executable file formats / Emulations"
 484
 485 source "fs/Kconfig.binfmt"
 486
 487 config SECCOMP
 488         def_bool y
 489         prompt "Enable seccomp to safely compute untrusted bytecode"
 490         depends on PROC_FS
 491         help
 492           This kernel feature is useful for number crunching applications
 493           that may need to compute untrusted bytecode during their
 494           execution. By using pipes or other transports made available to
 495           the process as file descriptors supporting the read/write
 496           syscalls, it's possible to isolate those applications in
 497           their own address space using seccomp. Once seccomp is
 498           enabled via /proc/<pid>/seccomp, it cannot be disabled
 499           and the task is only allowed to execute a few safe syscalls
 500           defined by each seccomp mode.
 501
 502           If unsure, say Y.
 503
 504 endmenu
 505
 506 menu "Power Management"
 507
 508 config ARCH_HIBERNATION_POSSIBLE
 509         def_bool y if 64BIT
 510
 511 source "kernel/power/Kconfig"
 512
 513 endmenu
 514
 515 source "net/Kconfig"
 516
 517 config PCMCIA
 518         def_bool n
 519
 520 config CCW
 521         def_bool y
 522
 523 source "drivers/Kconfig"
 524
 525 source "fs/Kconfig"
 526
 527 source "arch/s390/Kconfig.debug"
 528
 529 source "security/Kconfig"
 530
 531 source "crypto/Kconfig"
 532
 533 source "lib/Kconfig"
 534
 535 menu "Virtualization"
 536
 537 config PFAULT
 538         def_bool y
 539         prompt "Pseudo page fault support"
 540         help
 541           Select this option, if you want to use PFAULT pseudo page fault
 542           handling under VM. If running native or in LPAR, this option
 543           has no effect. If your VM does not support PFAULT, PAGEEX
 544           pseudo page fault handling will be used.
 545           Note that VM 4.2 supports PFAULT but has a bug in its
 546           implementation that causes some problems.
 547           Everybody who wants to run Linux under VM != VM4.2 should select
 548           this option.
 549
 550 config SHARED_KERNEL
 551         bool "VM shared kernel support"
 552         depends on !JUMP_LABEL
 553         help
 554           Select this option, if you want to share the text segment of the
 555           Linux kernel between different VM guests. This reduces memory
 556           usage with lots of guests but greatly increases kernel size.
 557           Also if a kernel was IPL'ed from a shared segment the kexec system
 558           call will not work.
 559           You should only select this option if you know what you are
 560           doing and want to exploit this feature.
 561
 562 config CMM
 563         def_tristate n
 564         prompt "Cooperative memory management"
 565         help
 566           Select this option, if you want to enable the kernel interface
 567           to reduce the memory size of the system. This is accomplished
 568           by allocating pages of memory and put them "on hold". This only
 569           makes sense for a system running under VM where the unused pages
 570           will be reused by VM for other guest systems. The interface
 571           allows an external monitor to balance memory of many systems.
 572           Everybody who wants to run Linux under VM should select this
 573           option.
 574
 575 config CMM_IUCV
 576         def_bool y
 577         prompt "IUCV special message interface to cooperative memory management"
 578         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 579         help
 580           Select this option to enable the special message interface to
 581           the cooperative memory management.
 582
 583 config APPLDATA_BASE
 584         def_bool n
 585         prompt "Linux - VM Monitor Stream, base infrastructure"
 586         depends on PROC_FS
 587         help
 588           This provides a kernel interface for creating and updating z/VM APPLDATA
 589           monitor records. The monitor records are updated at certain time
 590           intervals, once the timer is started.
 591           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 592           i.e. enables or disables monitoring on the Linux side.
 593           A custom interval value (in seconds) can be written to
 594           /proc/appldata/interval.
 595
 596           Defaults are 60 seconds interval and timer off.
 597           The /proc entries can also be read from, showing the current settings.
 598
 599 config APPLDATA_MEM
 600         def_tristate m
 601         prompt "Monitor memory management statistics"
 602         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 603         help
 604           This provides memory management related data to the Linux - VM Monitor
 605           Stream, like paging/swapping rate, memory utilisation, etc.
 606           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 607           APPLDATA monitor record, i.e. enables or disables monitoring this record
 608           on the z/VM side.
 609
 610           Default is disabled.
 611           The /proc entry can also be read from, showing the current settings.
 612
 613           This can also be compiled as a module, which will be called
 614           appldata_mem.o.
 615
 616 config APPLDATA_OS
 617         def_tristate m
 618         prompt "Monitor OS statistics"
 619         depends on APPLDATA_BASE
 620         help
 621           This provides OS related data to the Linux - VM Monitor Stream, like
 622           CPU utilisation, etc.
 623           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 624           APPLDATA monitor record, i.e. enables or disables monitoring this record
 625           on the z/VM side.
 626
 627           Default is disabled.
 628           This can also be compiled as a module, which will be called
 629           appldata_os.o.
 630
 631 config APPLDATA_NET_SUM
 632         def_tristate m
 633         prompt "Monitor overall network statistics"
 634         depends on APPLDATA_BASE && NET
 635         help
 636           This provides network related data to the Linux - VM Monitor Stream,
 637           currently there is only a total sum of network I/O statistics, no
 638           per-interface data.
 639           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 640           APPLDATA monitor record, i.e. enables or disables monitoring this record
 641           on the z/VM side.
 642
 643           Default is disabled.
 644           This can also be compiled as a module, which will be called
 645           appldata_net_sum.o.
 646
 647 config S390_HYPFS_FS
 648         def_bool y
 649         prompt "s390 hypervisor file system support"
 650         select SYS_HYPERVISOR
 651         help
 652           This is a virtual file system intended to provide accounting
 653           information in an s390 hypervisor environment.
 654
 655 source "arch/s390/kvm/Kconfig"
 656
 657 config S390_GUEST
 658         def_bool y
 659         prompt "s390 support for virtio devices (EXPERIMENTAL)"
 660         depends on 64BIT && EXPERIMENTAL
 661         select VIRTUALIZATION
 662         select VIRTIO
 663         select VIRTIO_CONSOLE
 664         help
 665           Enabling this option adds support for virtio based paravirtual device
 666           drivers on s390.
 667
 668           Select this option if you want to run the kernel as a guest under
 669           the KVM hypervisor.
 670
 671 endmenu