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 HAVE_DYNAMIC_FTRACE
  72         select HAVE_FUNCTION_GRAPH_TRACER
  73         select HAVE_REGS_AND_STACK_ACCESS_API
  74         select HAVE_OPROFILE
  75         select HAVE_KPROBES
  76         select HAVE_KRETPROBES
  77         select HAVE_KVM if 64BIT
  78         select HAVE_ARCH_TRACEHOOK
  79         select INIT_ALL_POSSIBLE
  80         select HAVE_IRQ_WORK
  81         select HAVE_PERF_EVENTS
  82         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  83         select HAVE_KERNEL_GZIP
  84         select HAVE_KERNEL_BZIP2
  85         select HAVE_KERNEL_LZMA
  86         select HAVE_KERNEL_LZO
  87         select HAVE_KERNEL_XZ
  88         select HAVE_ARCH_MUTEX_CPU_RELAX
  89         select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
  90         select HAVE_BPF_JIT if 64BIT && PACK_STACK
  91         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
  92         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  93         select HAVE_MEMBLOCK
  94         select HAVE_MEMBLOCK_NODE_MAP
  95         select HAVE_CMPXCHG_LOCAL
  96         select HAVE_CMPXCHG_DOUBLE
  97         select HAVE_VIRT_CPU_ACCOUNTING
  98         select VIRT_CPU_ACCOUNTING
  99         select ARCH_DISCARD_MEMBLOCK
 100         select BUILDTIME_EXTABLE_SORT
 101         select ARCH_INLINE_SPIN_TRYLOCK
 102         select ARCH_INLINE_SPIN_TRYLOCK_BH
 103         select ARCH_INLINE_SPIN_LOCK
 104         select ARCH_INLINE_SPIN_LOCK_BH
 105         select ARCH_INLINE_SPIN_LOCK_IRQ
 106         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
 107         select ARCH_INLINE_SPIN_UNLOCK
 108         select ARCH_INLINE_SPIN_UNLOCK_BH
 109         select ARCH_INLINE_SPIN_UNLOCK_IRQ
 110         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
 111         select ARCH_INLINE_READ_TRYLOCK
 112         select ARCH_INLINE_READ_LOCK
 113         select ARCH_INLINE_READ_LOCK_BH
 114         select ARCH_INLINE_READ_LOCK_IRQ
 115         select ARCH_INLINE_READ_LOCK_IRQSAVE
 116         select ARCH_INLINE_READ_UNLOCK
 117         select ARCH_INLINE_READ_UNLOCK_BH
 118         select ARCH_INLINE_READ_UNLOCK_IRQ
 119         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
 120         select ARCH_INLINE_WRITE_TRYLOCK
 121         select ARCH_INLINE_WRITE_LOCK
 122         select ARCH_INLINE_WRITE_LOCK_BH
 123         select ARCH_INLINE_WRITE_LOCK_IRQ
 124         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 125         select ARCH_INLINE_WRITE_UNLOCK
 126         select ARCH_INLINE_WRITE_UNLOCK_BH
 127         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 128         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 129         select ARCH_WANT_IPC_PARSE_VERSION
 130         select GENERIC_SMP_IDLE_THREAD
 131         select GENERIC_TIME_VSYSCALL
 132         select GENERIC_CLOCKEVENTS
 133         select KTIME_SCALAR if 32BIT
 134         select HAVE_ARCH_SECCOMP_FILTER
 135
 136 config SCHED_OMIT_FRAME_POINTER
 137         def_bool y
 138
 139 source "init/Kconfig"
 140
 141 source "kernel/Kconfig.freezer"
 142
 143 menu "Processor type and features"
 144
 145 config HAVE_MARCH_Z900_FEATURES
 146         def_bool n
 147
 148 config HAVE_MARCH_Z990_FEATURES
 149         def_bool n
 150         select HAVE_MARCH_Z900_FEATURES
 151
 152 config HAVE_MARCH_Z9_109_FEATURES
 153         def_bool n
 154         select HAVE_MARCH_Z990_FEATURES
 155
 156 config HAVE_MARCH_Z10_FEATURES
 157         def_bool n
 158         select HAVE_MARCH_Z9_109_FEATURES
 159
 160 config HAVE_MARCH_Z196_FEATURES
 161         def_bool n
 162         select HAVE_MARCH_Z10_FEATURES
 163
 164 choice
 165         prompt "Processor type"
 166         default MARCH_G5
 167
 168 config MARCH_G5
 169         bool "System/390 model G5 and G6"
 170         depends on !64BIT
 171         help
 172           Select this to build a 31 bit kernel that works
 173           on all ESA/390 and z/Architecture machines.
 174
 175 config MARCH_Z900
 176         bool "IBM zSeries model z800 and z900"
 177         select HAVE_MARCH_Z900_FEATURES if 64BIT
 178         help
 179           Select this to enable optimizations for model z800/z900 (2064 and
 180           2066 series). This will enable some optimizations that are not
 181           available on older ESA/390 (31 Bit) only CPUs.
 182
 183 config MARCH_Z990
 184         bool "IBM zSeries model z890 and z990"
 185         select HAVE_MARCH_Z990_FEATURES if 64BIT
 186         help
 187           Select this to enable optimizations for model z890/z990 (2084 and
 188           2086 series). The kernel will be slightly faster but will not work
 189           on older machines.
 190
 191 config MARCH_Z9_109
 192         bool "IBM System z9"
 193         select HAVE_MARCH_Z9_109_FEATURES if 64BIT
 194         help
 195           Select this to enable optimizations for IBM System z9 (2094 and
 196           2096 series). The kernel will be slightly faster but will not work
 197           on older machines.
 198
 199 config MARCH_Z10
 200         bool "IBM System z10"
 201         select HAVE_MARCH_Z10_FEATURES if 64BIT
 202         help
 203           Select this to enable optimizations for IBM System z10 (2097 and
 204           2098 series). The kernel will be slightly faster but will not work
 205           on older machines.
 206
 207 config MARCH_Z196
 208         bool "IBM zEnterprise 114 and 196"
 209         select HAVE_MARCH_Z196_FEATURES if 64BIT
 210         help
 211           Select this to enable optimizations for IBM zEnterprise 114 and 196
 212           (2818 and 2817 series). The kernel will be slightly faster but will
 213           not work on older machines.
 214
 215 endchoice
 216
 217 config 64BIT
 218         def_bool y
 219         prompt "64 bit kernel"
 220         help
 221           Select this option if you have an IBM z/Architecture machine
 222           and want to use the 64 bit addressing mode.
 223
 224 config 32BIT
 225         def_bool y if !64BIT
 226
 227 config COMPAT
 228         def_bool y
 229         prompt "Kernel support for 31 bit emulation"
 230         depends on 64BIT
 231         select COMPAT_BINFMT_ELF if BINFMT_ELF
 232         select ARCH_WANT_OLD_COMPAT_IPC
 233         help
 234           Select this option if you want to enable your system kernel to
 235           handle system-calls from ELF binaries for 31 bit ESA.  This option
 236           (and some other stuff like libraries and such) is needed for
 237           executing 31 bit applications.  It is safe to say "Y".
 238
 239 config SYSVIPC_COMPAT
 240         def_bool y if COMPAT && SYSVIPC
 241
 242 config KEYS_COMPAT
 243         def_bool y if COMPAT && KEYS
 244
 245 config SMP
 246         def_bool y
 247         prompt "Symmetric multi-processing support"
 248         ---help---
 249           This enables support for systems with more than one CPU. If you have
 250           a system with only one CPU, like most personal computers, say N. If
 251           you have a system with more than one CPU, say Y.
 252
 253           If you say N here, the kernel will run on single and multiprocessor
 254           machines, but will use only one CPU of a multiprocessor machine. If
 255           you say Y here, the kernel will run on many, but not all,
 256           singleprocessor machines. On a singleprocessor machine, the kernel
 257           will run faster if you say N here.
 258
 259           See also the SMP-HOWTO available at
 260           <http://www.tldp.org/docs.html#howto>.
 261
 262           Even if you don't know what to do here, say Y.
 263
 264 config NR_CPUS
 265         int "Maximum number of CPUs (2-64)"
 266         range 2 64
 267         depends on SMP
 268         default "32" if !64BIT
 269         default "64" if 64BIT
 270         help
 271           This allows you to specify the maximum number of CPUs which this
 272           kernel will support.  The maximum supported value is 64 and the
 273           minimum value which makes sense is 2.
 274
 275           This is purely to save memory - each supported CPU adds
 276           approximately sixteen kilobytes to the kernel image.
 277
 278 config HOTPLUG_CPU
 279         def_bool y
 280         prompt "Support for hot-pluggable CPUs"
 281         depends on SMP
 282         select HOTPLUG
 283         help
 284           Say Y here to be able to turn CPUs off and on. CPUs
 285           can be controlled through /sys/devices/system/cpu/cpu#.
 286           Say N if you want to disable CPU hotplug.
 287
 288 config SCHED_MC
 289         def_bool n
 290
 291 config SCHED_BOOK
 292         def_bool y
 293         prompt "Book scheduler support"
 294         depends on SMP
 295         select SCHED_MC
 296         help
 297           Book scheduler support improves the CPU scheduler's decision making
 298           when dealing with machines that have several books.
 299
 300 source kernel/Kconfig.preempt
 301
 302 config MATHEMU
 303         def_bool y
 304         prompt "IEEE FPU emulation"
 305         depends on MARCH_G5
 306         help
 307           This option is required for IEEE compliant floating point arithmetic
 308           on older ESA/390 machines. Say Y unless you know your machine doesn't
 309           need this.
 310
 311 source kernel/Kconfig.hz
 312
 313 endmenu
 314
 315 menu "Memory setup"
 316
 317 config ARCH_SPARSEMEM_ENABLE
 318         def_bool y
 319         select SPARSEMEM_VMEMMAP_ENABLE
 320         select SPARSEMEM_VMEMMAP
 321         select SPARSEMEM_STATIC if !64BIT
 322
 323 config ARCH_SPARSEMEM_DEFAULT
 324         def_bool y
 325
 326 config ARCH_SELECT_MEMORY_MODEL
 327         def_bool y
 328
 329 config ARCH_ENABLE_MEMORY_HOTPLUG
 330         def_bool y if SPARSEMEM
 331
 332 config ARCH_ENABLE_MEMORY_HOTREMOVE
 333         def_bool y
 334
 335 config FORCE_MAX_ZONEORDER
 336         int
 337         default "9"
 338
 339 source "mm/Kconfig"
 340
 341 config PACK_STACK
 342         def_bool y
 343         prompt "Pack kernel stack"
 344         help
 345           This option enables the compiler option -mkernel-backchain if it
 346           is available. If the option is available the compiler supports
 347           the new stack layout which dramatically reduces the minimum stack
 348           frame size. With an old compiler a non-leaf function needs a
 349           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 350           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 351           and 24 byte on 64 bit.
 352
 353           Say Y if you are unsure.
 354
 355 config SMALL_STACK
 356         def_bool n
 357         prompt "Use 8kb for kernel stack instead of 16kb"
 358         depends on PACK_STACK && 64BIT && !LOCKDEP
 359         help
 360           If you say Y here and the compiler supports the -mkernel-backchain
 361           option the kernel will use a smaller kernel stack size. The reduced
 362           size is 8kb instead of 16kb. This allows to run more threads on a
 363           system and reduces the pressure on the memory management for higher
 364           order page allocations.
 365
 366           Say N if you are unsure.
 367
 368 config CHECK_STACK
 369         def_bool y
 370         prompt "Detect kernel stack overflow"
 371         help
 372           This option enables the compiler option -mstack-guard and
 373           -mstack-size if they are available. If the compiler supports them
 374           it will emit additional code to each function prolog to trigger
 375           an illegal operation if the kernel stack is about to overflow.
 376
 377           Say N if you are unsure.
 378
 379 config STACK_GUARD
 380         int "Size of the guard area (128-1024)"
 381         range 128 1024
 382         depends on CHECK_STACK
 383         default "256"
 384         help
 385           This allows you to specify the size of the guard area at the lower
 386           end of the kernel stack. If the kernel stack points into the guard
 387           area on function entry an illegal operation is triggered. The size
 388           needs to be a power of 2. Please keep in mind that the size of an
 389           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 390           The minimum size for the stack guard should be 256 for 31 bit and
 391           512 for 64 bit.
 392
 393 config WARN_DYNAMIC_STACK
 394         def_bool n
 395         prompt "Emit compiler warnings for function with dynamic stack usage"
 396         help
 397           This option enables the compiler option -mwarn-dynamicstack. If the
 398           compiler supports this options generates warnings for functions
 399           that dynamically allocate stack space using alloca.
 400
 401           Say N if you are unsure.
 402
 403 endmenu
 404
 405 menu "I/O subsystem"
 406
 407 config QDIO
 408         def_tristate y
 409         prompt "QDIO support"
 410         ---help---
 411           This driver provides the Queued Direct I/O base support for
 412           IBM System z.
 413
 414           To compile this driver as a module, choose M here: the
 415           module will be called qdio.
 416
 417           If unsure, say Y.
 418
 419 config CHSC_SCH
 420         def_tristate m
 421         prompt "Support for CHSC subchannels"
 422         help
 423           This driver allows usage of CHSC subchannels. A CHSC subchannel
 424           is usually present on LPAR only.
 425           The driver creates a device /dev/chsc, which may be used to
 426           obtain I/O configuration information about the machine and
 427           to issue asynchronous chsc commands (DANGEROUS).
 428           You will usually only want to use this interface on a special
 429           LPAR designated for system management.
 430
 431           To compile this driver as a module, choose M here: the
 432           module will be called chsc_sch.
 433
 434           If unsure, say N.
 435
 436 config SCM_BUS
 437         def_bool y
 438         depends on 64BIT
 439         prompt "SCM bus driver"
 440         help
 441           Bus driver for Storage Class Memory.
 442
 443 config EADM_SCH
 444         def_tristate m
 445         prompt "Support for EADM subchannels"
 446         depends on SCM_BUS
 447         help
 448           This driver allows usage of EADM subchannels. EADM subchannels act
 449           as a communication vehicle for SCM increments.
 450
 451           To compile this driver as a module, choose M here: the
 452           module will be called eadm_sch.
 453
 454 endmenu
 455
 456 menu "Dump support"
 457
 458 config CRASH_DUMP
 459         bool "kernel crash dumps"
 460         depends on 64BIT && SMP
 461         select KEXEC
 462         help
 463           Generate crash dump after being started by kexec.
 464           Crash dump kernels are loaded in the main kernel with kexec-tools
 465           into a specially reserved region and then later executed after
 466           a crash by kdump/kexec.
 467           For more details see Documentation/kdump/kdump.txt
 468
 469 config ZFCPDUMP
 470         def_bool n
 471         prompt "zfcpdump support"
 472         select SMP
 473         help
 474           Select this option if you want to build an zfcpdump enabled kernel.
 475           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 476
 477 endmenu
 478
 479 menu "Executable file formats / Emulations"
 480
 481 source "fs/Kconfig.binfmt"
 482
 483 config SECCOMP
 484         def_bool y
 485         prompt "Enable seccomp to safely compute untrusted bytecode"
 486         depends on PROC_FS
 487         help
 488           This kernel feature is useful for number crunching applications
 489           that may need to compute untrusted bytecode during their
 490           execution. By using pipes or other transports made available to
 491           the process as file descriptors supporting the read/write
 492           syscalls, it's possible to isolate those applications in
 493           their own address space using seccomp. Once seccomp is
 494           enabled via /proc/<pid>/seccomp, it cannot be disabled
 495           and the task is only allowed to execute a few safe syscalls
 496           defined by each seccomp mode.
 497
 498           If unsure, say Y.
 499
 500 endmenu
 501
 502 menu "Power Management"
 503
 504 config ARCH_HIBERNATION_POSSIBLE
 505         def_bool y if 64BIT
 506
 507 source "kernel/power/Kconfig"
 508
 509 endmenu
 510
 511 source "net/Kconfig"
 512
 513 config PCMCIA
 514         def_bool n
 515
 516 config CCW
 517         def_bool y
 518
 519 source "drivers/Kconfig"
 520
 521 source "fs/Kconfig"
 522
 523 source "arch/s390/Kconfig.debug"
 524
 525 source "security/Kconfig"
 526
 527 source "crypto/Kconfig"
 528
 529 source "lib/Kconfig"
 530
 531 menu "Virtualization"
 532
 533 config PFAULT
 534         def_bool y
 535         prompt "Pseudo page fault support"
 536         help
 537           Select this option, if you want to use PFAULT pseudo page fault
 538           handling under VM. If running native or in LPAR, this option
 539           has no effect. If your VM does not support PFAULT, PAGEEX
 540           pseudo page fault handling will be used.
 541           Note that VM 4.2 supports PFAULT but has a bug in its
 542           implementation that causes some problems.
 543           Everybody who wants to run Linux under VM != VM4.2 should select
 544           this option.
 545
 546 config SHARED_KERNEL
 547         bool "VM shared kernel support"
 548         depends on !JUMP_LABEL
 549         help
 550           Select this option, if you want to share the text segment of the
 551           Linux kernel between different VM guests. This reduces memory
 552           usage with lots of guests but greatly increases kernel size.
 553           Also if a kernel was IPL'ed from a shared segment the kexec system
 554           call will not work.
 555           You should only select this option if you know what you are
 556           doing and want to exploit this feature.
 557
 558 config CMM
 559         def_tristate n
 560         prompt "Cooperative memory management"
 561         help
 562           Select this option, if you want to enable the kernel interface
 563           to reduce the memory size of the system. This is accomplished
 564           by allocating pages of memory and put them "on hold". This only
 565           makes sense for a system running under VM where the unused pages
 566           will be reused by VM for other guest systems. The interface
 567           allows an external monitor to balance memory of many systems.
 568           Everybody who wants to run Linux under VM should select this
 569           option.
 570
 571 config CMM_IUCV
 572         def_bool y
 573         prompt "IUCV special message interface to cooperative memory management"
 574         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 575         help
 576           Select this option to enable the special message interface to
 577           the cooperative memory management.
 578
 579 config APPLDATA_BASE
 580         def_bool n
 581         prompt "Linux - VM Monitor Stream, base infrastructure"
 582         depends on PROC_FS
 583         help
 584           This provides a kernel interface for creating and updating z/VM APPLDATA
 585           monitor records. The monitor records are updated at certain time
 586           intervals, once the timer is started.
 587           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 588           i.e. enables or disables monitoring on the Linux side.
 589           A custom interval value (in seconds) can be written to
 590           /proc/appldata/interval.
 591
 592           Defaults are 60 seconds interval and timer off.
 593           The /proc entries can also be read from, showing the current settings.
 594
 595 config APPLDATA_MEM
 596         def_tristate m
 597         prompt "Monitor memory management statistics"
 598         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 599         help
 600           This provides memory management related data to the Linux - VM Monitor
 601           Stream, like paging/swapping rate, memory utilisation, etc.
 602           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 603           APPLDATA monitor record, i.e. enables or disables monitoring this record
 604           on the z/VM side.
 605
 606           Default is disabled.
 607           The /proc entry can also be read from, showing the current settings.
 608
 609           This can also be compiled as a module, which will be called
 610           appldata_mem.o.
 611
 612 config APPLDATA_OS
 613         def_tristate m
 614         prompt "Monitor OS statistics"
 615         depends on APPLDATA_BASE
 616         help
 617           This provides OS related data to the Linux - VM Monitor Stream, like
 618           CPU utilisation, etc.
 619           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 620           APPLDATA monitor record, i.e. enables or disables monitoring this record
 621           on the z/VM side.
 622
 623           Default is disabled.
 624           This can also be compiled as a module, which will be called
 625           appldata_os.o.
 626
 627 config APPLDATA_NET_SUM
 628         def_tristate m
 629         prompt "Monitor overall network statistics"
 630         depends on APPLDATA_BASE && NET
 631         help
 632           This provides network related data to the Linux - VM Monitor Stream,
 633           currently there is only a total sum of network I/O statistics, no
 634           per-interface data.
 635           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 636           APPLDATA monitor record, i.e. enables or disables monitoring this record
 637           on the z/VM side.
 638
 639           Default is disabled.
 640           This can also be compiled as a module, which will be called
 641           appldata_net_sum.o.
 642
 643 config S390_HYPFS_FS
 644         def_bool y
 645         prompt "s390 hypervisor file system support"
 646         select SYS_HYPERVISOR
 647         help
 648           This is a virtual file system intended to provide accounting
 649           information in an s390 hypervisor environment.
 650
 651 source "arch/s390/kvm/Kconfig"
 652
 653 config S390_GUEST
 654         def_bool y
 655         prompt "s390 support for virtio devices (EXPERIMENTAL)"
 656         depends on 64BIT && EXPERIMENTAL
 657         select VIRTUALIZATION
 658         select VIRTIO
 659         select VIRTIO_RING
 660         select VIRTIO_CONSOLE
 661         help
 662           Enabling this option adds support for virtio based paravirtual device
 663           drivers on s390.
 664
 665           Select this option if you want to run the kernel as a guest under
 666           the KVM hypervisor.
 667
 668 endmenu