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