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