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