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 VIRT_CPU_ACCOUNTING
  53         def_bool y
  54
  55 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  56         def_bool y
  57
  58 config S390
  59         def_bool y
  60         select USE_GENERIC_SMP_HELPERS if SMP
  61         select GENERIC_CPU_DEVICES if !SMP
  62         select HAVE_SYSCALL_WRAPPERS
  63         select HAVE_FUNCTION_TRACER
  64         select HAVE_FUNCTION_TRACE_MCOUNT_TEST
  65         select HAVE_FTRACE_MCOUNT_RECORD
  66         select HAVE_C_RECORDMCOUNT
  67         select HAVE_SYSCALL_TRACEPOINTS
  68         select HAVE_DYNAMIC_FTRACE
  69         select HAVE_FUNCTION_GRAPH_TRACER
  70         select HAVE_REGS_AND_STACK_ACCESS_API
  71         select HAVE_OPROFILE
  72         select HAVE_KPROBES
  73         select HAVE_KRETPROBES
  74         select HAVE_KVM if 64BIT
  75         select HAVE_ARCH_TRACEHOOK
  76         select INIT_ALL_POSSIBLE
  77         select HAVE_IRQ_WORK
  78         select HAVE_PERF_EVENTS
  79         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  80         select HAVE_KERNEL_GZIP
  81         select HAVE_KERNEL_BZIP2
  82         select HAVE_KERNEL_LZMA
  83         select HAVE_KERNEL_LZO
  84         select HAVE_KERNEL_XZ
  85         select HAVE_ARCH_MUTEX_CPU_RELAX
  86         select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
  87         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
  88         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  89         select HAVE_MEMBLOCK
  90         select HAVE_MEMBLOCK_NODE_MAP
  91         select HAVE_CMPXCHG_LOCAL
  92         select ARCH_DISCARD_MEMBLOCK
  93         select BUILDTIME_EXTABLE_SORT
  94         select ARCH_INLINE_SPIN_TRYLOCK
  95         select ARCH_INLINE_SPIN_TRYLOCK_BH
  96         select ARCH_INLINE_SPIN_LOCK
  97         select ARCH_INLINE_SPIN_LOCK_BH
  98         select ARCH_INLINE_SPIN_LOCK_IRQ
  99         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
 100         select ARCH_INLINE_SPIN_UNLOCK
 101         select ARCH_INLINE_SPIN_UNLOCK_BH
 102         select ARCH_INLINE_SPIN_UNLOCK_IRQ
 103         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
 104         select ARCH_INLINE_READ_TRYLOCK
 105         select ARCH_INLINE_READ_LOCK
 106         select ARCH_INLINE_READ_LOCK_BH
 107         select ARCH_INLINE_READ_LOCK_IRQ
 108         select ARCH_INLINE_READ_LOCK_IRQSAVE
 109         select ARCH_INLINE_READ_UNLOCK
 110         select ARCH_INLINE_READ_UNLOCK_BH
 111         select ARCH_INLINE_READ_UNLOCK_IRQ
 112         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
 113         select ARCH_INLINE_WRITE_TRYLOCK
 114         select ARCH_INLINE_WRITE_LOCK
 115         select ARCH_INLINE_WRITE_LOCK_BH
 116         select ARCH_INLINE_WRITE_LOCK_IRQ
 117         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 118         select ARCH_INLINE_WRITE_UNLOCK
 119         select ARCH_INLINE_WRITE_UNLOCK_BH
 120         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 121         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 122         select ARCH_WANT_IPC_PARSE_VERSION
 123         select GENERIC_SMP_IDLE_THREAD
 124         select GENERIC_TIME_VSYSCALL
 125         select GENERIC_CLOCKEVENTS
 126         select KTIME_SCALAR if 32BIT
 127         select HAVE_ARCH_SECCOMP_FILTER
 128
 129 config SCHED_OMIT_FRAME_POINTER
 130         def_bool y
 131
 132 source "init/Kconfig"
 133
 134 source "kernel/Kconfig.freezer"
 135
 136 menu "Base setup"
 137
 138 comment "Processor type and features"
 139
 140 config 64BIT
 141         def_bool y
 142         prompt "64 bit kernel"
 143         help
 144           Select this option if you have an IBM z/Architecture machine
 145           and want to use the 64 bit addressing mode.
 146
 147 config 32BIT
 148         def_bool y if !64BIT
 149
 150 config SMP
 151         def_bool y
 152         prompt "Symmetric multi-processing support"
 153         ---help---
 154           This enables support for systems with more than one CPU. If you have
 155           a system with only one CPU, like most personal computers, say N. If
 156           you have a system with more than one CPU, say Y.
 157
 158           If you say N here, the kernel will run on single and multiprocessor
 159           machines, but will use only one CPU of a multiprocessor machine. If
 160           you say Y here, the kernel will run on many, but not all,
 161           singleprocessor machines. On a singleprocessor machine, the kernel
 162           will run faster if you say N here.
 163
 164           See also the SMP-HOWTO available at
 165           <http://www.tldp.org/docs.html#howto>.
 166
 167           Even if you don't know what to do here, say Y.
 168
 169 config NR_CPUS
 170         int "Maximum number of CPUs (2-64)"
 171         range 2 64
 172         depends on SMP
 173         default "32" if !64BIT
 174         default "64" if 64BIT
 175         help
 176           This allows you to specify the maximum number of CPUs which this
 177           kernel will support.  The maximum supported value is 64 and the
 178           minimum value which makes sense is 2.
 179
 180           This is purely to save memory - each supported CPU adds
 181           approximately sixteen kilobytes to the kernel image.
 182
 183 config HOTPLUG_CPU
 184         def_bool y
 185         prompt "Support for hot-pluggable CPUs"
 186         depends on SMP
 187         select HOTPLUG
 188         help
 189           Say Y here to be able to turn CPUs off and on. CPUs
 190           can be controlled through /sys/devices/system/cpu/cpu#.
 191           Say N if you want to disable CPU hotplug.
 192
 193 config SCHED_MC
 194         def_bool n
 195
 196 config SCHED_BOOK
 197         def_bool y
 198         prompt "Book scheduler support"
 199         depends on SMP
 200         select SCHED_MC
 201         help
 202           Book scheduler support improves the CPU scheduler's decision making
 203           when dealing with machines that have several books.
 204
 205 config MATHEMU
 206         def_bool y
 207         prompt "IEEE FPU emulation"
 208         depends on MARCH_G5
 209         help
 210           This option is required for IEEE compliant floating point arithmetic
 211           on older ESA/390 machines. Say Y unless you know your machine doesn't
 212           need this.
 213
 214 config COMPAT
 215         def_bool y
 216         prompt "Kernel support for 31 bit emulation"
 217         depends on 64BIT
 218         select COMPAT_BINFMT_ELF if BINFMT_ELF
 219         select ARCH_WANT_OLD_COMPAT_IPC
 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 KEYS_COMPAT
 230         def_bool y if COMPAT && KEYS
 231
 232 config AUDIT_ARCH
 233         def_bool y
 234
 235 config HAVE_MARCH_Z900_FEATURES
 236         def_bool n
 237
 238 config HAVE_MARCH_Z990_FEATURES
 239         def_bool n
 240         select HAVE_MARCH_Z900_FEATURES
 241
 242 config HAVE_MARCH_Z9_109_FEATURES
 243         def_bool n
 244         select HAVE_MARCH_Z990_FEATURES
 245
 246 config HAVE_MARCH_Z10_FEATURES
 247         def_bool n
 248         select HAVE_MARCH_Z9_109_FEATURES
 249
 250 config HAVE_MARCH_Z196_FEATURES
 251         def_bool n
 252         select HAVE_MARCH_Z10_FEATURES
 253
 254 comment "Code generation options"
 255
 256 choice
 257         prompt "Processor type"
 258         default MARCH_G5
 259
 260 config MARCH_G5
 261         bool "System/390 model G5 and G6"
 262         depends on !64BIT
 263         help
 264           Select this to build a 31 bit kernel that works
 265           on all ESA/390 and z/Architecture machines.
 266
 267 config MARCH_Z900
 268         bool "IBM zSeries model z800 and z900"
 269         select HAVE_MARCH_Z900_FEATURES if 64BIT
 270         help
 271           Select this to enable optimizations for model z800/z900 (2064 and
 272           2066 series). This will enable some optimizations that are not
 273           available on older ESA/390 (31 Bit) only CPUs.
 274
 275 config MARCH_Z990
 276         bool "IBM zSeries model z890 and z990"
 277         select HAVE_MARCH_Z990_FEATURES if 64BIT
 278         help
 279           Select this to enable optimizations for model z890/z990 (2084 and
 280           2086 series). The kernel will be slightly faster but will not work
 281           on older machines.
 282
 283 config MARCH_Z9_109
 284         bool "IBM System z9"
 285         select HAVE_MARCH_Z9_109_FEATURES if 64BIT
 286         help
 287           Select this to enable optimizations for IBM System z9 (2094 and
 288           2096 series). The kernel will be slightly faster but will not work
 289           on older machines.
 290
 291 config MARCH_Z10
 292         bool "IBM System z10"
 293         select HAVE_MARCH_Z10_FEATURES if 64BIT
 294         help
 295           Select this to enable optimizations for IBM System z10 (2097 and
 296           2098 series). The kernel will be slightly faster but will not work
 297           on older machines.
 298
 299 config MARCH_Z196
 300         bool "IBM zEnterprise 114 and 196"
 301         select HAVE_MARCH_Z196_FEATURES if 64BIT
 302         help
 303           Select this to enable optimizations for IBM zEnterprise 114 and 196
 304           (2818 and 2817 series). The kernel will be slightly faster but will
 305           not work on older machines.
 306
 307 endchoice
 308
 309 config PACK_STACK
 310         def_bool y
 311         prompt "Pack kernel stack"
 312         help
 313           This option enables the compiler option -mkernel-backchain if it
 314           is available. If the option is available the compiler supports
 315           the new stack layout which dramatically reduces the minimum stack
 316           frame size. With an old compiler a non-leaf function needs a
 317           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 318           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 319           and 24 byte on 64 bit.
 320
 321           Say Y if you are unsure.
 322
 323 config SMALL_STACK
 324         def_bool n
 325         prompt "Use 8kb for kernel stack instead of 16kb"
 326         depends on PACK_STACK && 64BIT && !LOCKDEP
 327         help
 328           If you say Y here and the compiler supports the -mkernel-backchain
 329           option the kernel will use a smaller kernel stack size. The reduced
 330           size is 8kb instead of 16kb. This allows to run more threads on a
 331           system and reduces the pressure on the memory management for higher
 332           order page allocations.
 333
 334           Say N if you are unsure.
 335
 336 config CHECK_STACK
 337         def_bool y
 338         prompt "Detect kernel stack overflow"
 339         help
 340           This option enables the compiler option -mstack-guard and
 341           -mstack-size if they are available. If the compiler supports them
 342           it will emit additional code to each function prolog to trigger
 343           an illegal operation if the kernel stack is about to overflow.
 344
 345           Say N if you are unsure.
 346
 347 config STACK_GUARD
 348         int "Size of the guard area (128-1024)"
 349         range 128 1024
 350         depends on CHECK_STACK
 351         default "256"
 352         help
 353           This allows you to specify the size of the guard area at the lower
 354           end of the kernel stack. If the kernel stack points into the guard
 355           area on function entry an illegal operation is triggered. The size
 356           needs to be a power of 2. Please keep in mind that the size of an
 357           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 358           The minimum size for the stack guard should be 256 for 31 bit and
 359           512 for 64 bit.
 360
 361 config WARN_DYNAMIC_STACK
 362         def_bool n
 363         prompt "Emit compiler warnings for function with dynamic stack usage"
 364         help
 365           This option enables the compiler option -mwarn-dynamicstack. If the
 366           compiler supports this options generates warnings for functions
 367           that dynamically allocate stack space using alloca.
 368
 369           Say N if you are unsure.
 370
 371 comment "Kernel preemption"
 372
 373 source "kernel/Kconfig.preempt"
 374
 375 config ARCH_SPARSEMEM_ENABLE
 376         def_bool y
 377         select SPARSEMEM_VMEMMAP_ENABLE
 378         select SPARSEMEM_VMEMMAP
 379         select SPARSEMEM_STATIC if !64BIT
 380
 381 config ARCH_SPARSEMEM_DEFAULT
 382         def_bool y
 383
 384 config ARCH_SELECT_MEMORY_MODEL
 385         def_bool y
 386
 387 config ARCH_ENABLE_MEMORY_HOTPLUG
 388         def_bool y if SPARSEMEM
 389
 390 config ARCH_ENABLE_MEMORY_HOTREMOVE
 391         def_bool y
 392
 393 config ARCH_HIBERNATION_POSSIBLE
 394         def_bool y if 64BIT
 395
 396 source "mm/Kconfig"
 397
 398 comment "I/O subsystem configuration"
 399
 400 config QDIO
 401         def_tristate y
 402         prompt "QDIO support"
 403         ---help---
 404           This driver provides the Queued Direct I/O base support for
 405           IBM System z.
 406
 407           To compile this driver as a module, choose M here: the
 408           module will be called qdio.
 409
 410           If unsure, say Y.
 411
 412 config CHSC_SCH
 413         def_tristate m
 414         prompt "Support for CHSC subchannels"
 415         help
 416           This driver allows usage of CHSC subchannels. A CHSC subchannel
 417           is usually present on LPAR only.
 418           The driver creates a device /dev/chsc, which may be used to
 419           obtain I/O configuration information about the machine and
 420           to issue asynchronous chsc commands (DANGEROUS).
 421           You will usually only want to use this interface on a special
 422           LPAR designated for system management.
 423
 424           To compile this driver as a module, choose M here: the
 425           module will be called chsc_sch.
 426
 427           If unsure, say N.
 428
 429 comment "Misc"
 430
 431 source "fs/Kconfig.binfmt"
 432
 433 config FORCE_MAX_ZONEORDER
 434         int
 435         default "9"
 436
 437 config PFAULT
 438         def_bool y
 439         prompt "Pseudo page fault support"
 440         help
 441           Select this option, if you want to use PFAULT pseudo page fault
 442           handling under VM. If running native or in LPAR, this option
 443           has no effect. If your VM does not support PFAULT, PAGEEX
 444           pseudo page fault handling will be used.
 445           Note that VM 4.2 supports PFAULT but has a bug in its
 446           implementation that causes some problems.
 447           Everybody who wants to run Linux under VM != VM4.2 should select
 448           this option.
 449
 450 config SHARED_KERNEL
 451         def_bool y
 452         prompt "VM shared kernel support"
 453         help
 454           Select this option, if you want to share the text segment of the
 455           Linux kernel between different VM guests. This reduces memory
 456           usage with lots of guests but greatly increases kernel size.
 457           Also if a kernel was IPL'ed from a shared segment the kexec system
 458           call will not work.
 459           You should only select this option if you know what you are
 460           doing and want to exploit this feature.
 461
 462 config CMM
 463         def_tristate n
 464         prompt "Cooperative memory management"
 465         help
 466           Select this option, if you want to enable the kernel interface
 467           to reduce the memory size of the system. This is accomplished
 468           by allocating pages of memory and put them "on hold". This only
 469           makes sense for a system running under VM where the unused pages
 470           will be reused by VM for other guest systems. The interface
 471           allows an external monitor to balance memory of many systems.
 472           Everybody who wants to run Linux under VM should select this
 473           option.
 474
 475 config CMM_IUCV
 476         def_bool y
 477         prompt "IUCV special message interface to cooperative memory management"
 478         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 479         help
 480           Select this option to enable the special message interface to
 481           the cooperative memory management.
 482
 483 config APPLDATA_BASE
 484         def_bool n
 485         prompt "Linux - VM Monitor Stream, base infrastructure"
 486         depends on PROC_FS
 487         help
 488           This provides a kernel interface for creating and updating z/VM APPLDATA
 489           monitor records. The monitor records are updated at certain time
 490           intervals, once the timer is started.
 491           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 492           i.e. enables or disables monitoring on the Linux side.
 493           A custom interval value (in seconds) can be written to
 494           /proc/appldata/interval.
 495
 496           Defaults are 60 seconds interval and timer off.
 497           The /proc entries can also be read from, showing the current settings.
 498
 499 config APPLDATA_MEM
 500         def_tristate m
 501         prompt "Monitor memory management statistics"
 502         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 503         help
 504           This provides memory management related data to the Linux - VM Monitor
 505           Stream, like paging/swapping rate, memory utilisation, etc.
 506           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 507           APPLDATA monitor record, i.e. enables or disables monitoring this record
 508           on the z/VM side.
 509
 510           Default is disabled.
 511           The /proc entry can also be read from, showing the current settings.
 512
 513           This can also be compiled as a module, which will be called
 514           appldata_mem.o.
 515
 516 config APPLDATA_OS
 517         def_tristate m
 518         prompt "Monitor OS statistics"
 519         depends on APPLDATA_BASE
 520         help
 521           This provides OS related data to the Linux - VM Monitor Stream, like
 522           CPU utilisation, etc.
 523           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 524           APPLDATA monitor record, i.e. enables or disables monitoring this record
 525           on the z/VM side.
 526
 527           Default is disabled.
 528           This can also be compiled as a module, which will be called
 529           appldata_os.o.
 530
 531 config APPLDATA_NET_SUM
 532         def_tristate m
 533         prompt "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         def_bool y
 551         prompt "s390 hypervisor file system support"
 552         select SYS_HYPERVISOR
 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         def_bool n
 559         prompt "kexec system call"
 560         help
 561           kexec is a system call that implements the ability to shutdown your
 562           current kernel, and to start another kernel.  It is like a reboot
 563           but is independent of hardware/microcode support.
 564
 565 config CRASH_DUMP
 566         bool "kernel crash dumps"
 567         depends on 64BIT && SMP
 568         select KEXEC
 569         help
 570           Generate crash dump after being started by kexec.
 571           Crash dump kernels are loaded in the main kernel with kexec-tools
 572           into a specially reserved region and then later executed after
 573           a crash by kdump/kexec.
 574           For more details see Documentation/kdump/kdump.txt
 575
 576 config ZFCPDUMP
 577         def_bool n
 578         prompt "zfcpdump support"
 579         select SMP
 580         help
 581           Select this option if you want to build an zfcpdump enabled kernel.
 582           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 583
 584 config S390_GUEST
 585         def_bool y
 586         prompt "s390 guest support for KVM (EXPERIMENTAL)"
 587         depends on 64BIT && EXPERIMENTAL
 588         select VIRTUALIZATION
 589         select VIRTIO
 590         select VIRTIO_RING
 591         select VIRTIO_CONSOLE
 592         help
 593           Select this option if you want to run the kernel as a guest under
 594           the KVM hypervisor. This will add detection for KVM as well  as a
 595           virtio transport. If KVM is detected, the virtio console will be
 596           the default console.
 597
 598 config SECCOMP
 599         def_bool y
 600         prompt "Enable seccomp to safely compute untrusted bytecode"
 601         depends on PROC_FS
 602         help
 603           This kernel feature is useful for number crunching applications
 604           that may need to compute untrusted bytecode during their
 605           execution. By using pipes or other transports made available to
 606           the process as file descriptors supporting the read/write
 607           syscalls, it's possible to isolate those applications in
 608           their own address space using seccomp. Once seccomp is
 609           enabled via /proc/<pid>/seccomp, it cannot be disabled
 610           and the task is only allowed to execute a few safe syscalls
 611           defined by each seccomp mode.
 612
 613           If unsure, say Y.
 614
 615 endmenu
 616
 617 menu "Power Management"
 618
 619 source "kernel/power/Kconfig"
 620
 621 endmenu
 622
 623 source "net/Kconfig"
 624
 625 config PCMCIA
 626         def_bool n
 627
 628 config CCW
 629         def_bool y
 630
 631 source "drivers/Kconfig"
 632
 633 source "fs/Kconfig"
 634
 635 source "arch/s390/Kconfig.debug"
 636
 637 source "security/Kconfig"
 638
 639 source "crypto/Kconfig"
 640
 641 source "lib/Kconfig"
 642
 643 source "arch/s390/kvm/Kconfig"