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_TIME_VSYSCALL
  32         def_bool y
  33
  34 config GENERIC_CLOCKEVENTS
  35         def_bool y
  36
  37 config GENERIC_BUG
  38         def_bool y if BUG
  39
  40 config GENERIC_BUG_RELATIVE_POINTERS
  41         def_bool y
  42
  43 config NO_IOMEM
  44         def_bool y
  45
  46 config NO_DMA
  47         def_bool y
  48
  49 config ARCH_DMA_ADDR_T_64BIT
  50         def_bool 64BIT
  51
  52 config GENERIC_LOCKBREAK
  53         def_bool y if SMP && PREEMPT
  54
  55 config PGSTE
  56         def_bool y if KVM
  57
  58 config VIRT_CPU_ACCOUNTING
  59         def_bool y
  60
  61 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  62         def_bool y
  63
  64 config S390
  65         def_bool y
  66         select USE_GENERIC_SMP_HELPERS if SMP
  67         select HAVE_SYSCALL_WRAPPERS
  68         select HAVE_FUNCTION_TRACER
  69         select HAVE_FUNCTION_TRACE_MCOUNT_TEST
  70         select HAVE_FTRACE_MCOUNT_RECORD
  71         select HAVE_C_RECORDMCOUNT
  72         select HAVE_SYSCALL_TRACEPOINTS
  73         select HAVE_DYNAMIC_FTRACE
  74         select HAVE_FUNCTION_GRAPH_TRACER
  75         select HAVE_REGS_AND_STACK_ACCESS_API
  76         select HAVE_OPROFILE
  77         select HAVE_KPROBES
  78         select HAVE_KRETPROBES
  79         select HAVE_KVM if 64BIT
  80         select HAVE_ARCH_TRACEHOOK
  81         select INIT_ALL_POSSIBLE
  82         select HAVE_IRQ_WORK
  83         select HAVE_PERF_EVENTS
  84         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  85         select HAVE_KERNEL_GZIP
  86         select HAVE_KERNEL_BZIP2
  87         select HAVE_KERNEL_LZMA
  88         select HAVE_KERNEL_LZO
  89         select HAVE_KERNEL_XZ
  90         select HAVE_ARCH_MUTEX_CPU_RELAX
  91         select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
  92         select HAVE_RCU_TABLE_FREE if SMP
  93         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
  94         select HAVE_MEMBLOCK
  95         select HAVE_MEMBLOCK_NODE_MAP
  96         select ARCH_DISCARD_MEMBLOCK
  97         select ARCH_INLINE_SPIN_TRYLOCK
  98         select ARCH_INLINE_SPIN_TRYLOCK_BH
  99         select ARCH_INLINE_SPIN_LOCK
 100         select ARCH_INLINE_SPIN_LOCK_BH
 101         select ARCH_INLINE_SPIN_LOCK_IRQ
 102         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
 103         select ARCH_INLINE_SPIN_UNLOCK
 104         select ARCH_INLINE_SPIN_UNLOCK_BH
 105         select ARCH_INLINE_SPIN_UNLOCK_IRQ
 106         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
 107         select ARCH_INLINE_READ_TRYLOCK
 108         select ARCH_INLINE_READ_LOCK
 109         select ARCH_INLINE_READ_LOCK_BH
 110         select ARCH_INLINE_READ_LOCK_IRQ
 111         select ARCH_INLINE_READ_LOCK_IRQSAVE
 112         select ARCH_INLINE_READ_UNLOCK
 113         select ARCH_INLINE_READ_UNLOCK_BH
 114         select ARCH_INLINE_READ_UNLOCK_IRQ
 115         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
 116         select ARCH_INLINE_WRITE_TRYLOCK
 117         select ARCH_INLINE_WRITE_LOCK
 118         select ARCH_INLINE_WRITE_LOCK_BH
 119         select ARCH_INLINE_WRITE_LOCK_IRQ
 120         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 121         select ARCH_INLINE_WRITE_UNLOCK
 122         select ARCH_INLINE_WRITE_UNLOCK_BH
 123         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 124         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 125
 126 config SCHED_OMIT_FRAME_POINTER
 127         def_bool y
 128
 129 source "init/Kconfig"
 130
 131 source "kernel/Kconfig.freezer"
 132
 133 menu "Base setup"
 134
 135 comment "Processor type and features"
 136
 137 source "kernel/time/Kconfig"
 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 KTIME_SCALAR
 150         def_bool 32BIT
 151
 152 config SMP
 153         def_bool y
 154         prompt "Symmetric multi-processing support"
 155         ---help---
 156           This enables support for systems with more than one CPU. If you have
 157           a system with only one CPU, like most personal computers, say N. If
 158           you have a system with more than one CPU, say Y.
 159
 160           If you say N here, the kernel will run on single and multiprocessor
 161           machines, but will use only one CPU of a multiprocessor machine. If
 162           you say Y here, the kernel will run on many, but not all,
 163           singleprocessor machines. On a singleprocessor machine, the kernel
 164           will run faster if you say N here.
 165
 166           See also the SMP-HOWTO available at
 167           <http://www.tldp.org/docs.html#howto>.
 168
 169           Even if you don't know what to do here, say Y.
 170
 171 config NR_CPUS
 172         int "Maximum number of CPUs (2-64)"
 173         range 2 64
 174         depends on SMP
 175         default "32" if !64BIT
 176         default "64" if 64BIT
 177         help
 178           This allows you to specify the maximum number of CPUs which this
 179           kernel will support.  The maximum supported value is 64 and the
 180           minimum value which makes sense is 2.
 181
 182           This is purely to save memory - each supported CPU adds
 183           approximately sixteen kilobytes to the kernel image.
 184
 185 config HOTPLUG_CPU
 186         def_bool y
 187         prompt "Support for hot-pluggable CPUs"
 188         depends on SMP
 189         select HOTPLUG
 190         help
 191           Say Y here to be able to turn CPUs off and on. CPUs
 192           can be controlled through /sys/devices/system/cpu/cpu#.
 193           Say N if you want to disable CPU hotplug.
 194
 195 config SCHED_MC
 196         def_bool n
 197
 198 config SCHED_BOOK
 199         def_bool y
 200         prompt "Book scheduler support"
 201         depends on SMP
 202         select SCHED_MC
 203         help
 204           Book scheduler support improves the CPU scheduler's decision making
 205           when dealing with machines that have several books.
 206
 207 config MATHEMU
 208         def_bool y
 209         prompt "IEEE FPU emulation"
 210         depends on MARCH_G5
 211         help
 212           This option is required for IEEE compliant floating point arithmetic
 213           on older ESA/390 machines. Say Y unless you know your machine doesn't
 214           need this.
 215
 216 config COMPAT
 217         def_bool y
 218         prompt "Kernel support for 31 bit emulation"
 219         depends on 64BIT
 220         select COMPAT_BINFMT_ELF
 221         help
 222           Select this option if you want to enable your system kernel to
 223           handle system-calls from ELF binaries for 31 bit ESA.  This option
 224           (and some other stuff like libraries and such) is needed for
 225           executing 31 bit applications.  It is safe to say "Y".
 226
 227 config SYSVIPC_COMPAT
 228         def_bool y if COMPAT && SYSVIPC
 229
 230 config AUDIT_ARCH
 231         def_bool y
 232
 233 comment "Code generation options"
 234
 235 choice
 236         prompt "Processor type"
 237         default MARCH_G5
 238
 239 config MARCH_G5
 240         bool "System/390 model G5 and G6"
 241         depends on !64BIT
 242         help
 243           Select this to build a 31 bit kernel that works
 244           on all ESA/390 and z/Architecture machines.
 245
 246 config MARCH_Z900
 247         bool "IBM zSeries model z800 and z900"
 248         help
 249           Select this to enable optimizations for model z800/z900 (2064 and
 250           2066 series). This will enable some optimizations that are not
 251           available on older ESA/390 (31 Bit) only CPUs.
 252
 253 config MARCH_Z990
 254         bool "IBM zSeries model z890 and z990"
 255         help
 256           Select this to enable optimizations for model z890/z990 (2084 and
 257           2086 series). The kernel will be slightly faster but will not work
 258           on older machines.
 259
 260 config MARCH_Z9_109
 261         bool "IBM System z9"
 262         help
 263           Select this to enable optimizations for IBM System z9 (2094 and
 264           2096 series). The kernel will be slightly faster but will not work
 265           on older machines.
 266
 267 config MARCH_Z10
 268         bool "IBM System z10"
 269         help
 270           Select this to enable optimizations for IBM System z10 (2097 and
 271           2098 series). The kernel will be slightly faster but will not work
 272           on older machines.
 273
 274 config MARCH_Z196
 275         bool "IBM zEnterprise 114 and 196"
 276         help
 277           Select this to enable optimizations for IBM zEnterprise 114 and 196
 278           (2818 and 2817 series). The kernel will be slightly faster but will
 279           not work on older machines.
 280
 281 endchoice
 282
 283 config PACK_STACK
 284         def_bool y
 285         prompt "Pack kernel stack"
 286         help
 287           This option enables the compiler option -mkernel-backchain if it
 288           is available. If the option is available the compiler supports
 289           the new stack layout which dramatically reduces the minimum stack
 290           frame size. With an old compiler a non-leaf function needs a
 291           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 292           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 293           and 24 byte on 64 bit.
 294
 295           Say Y if you are unsure.
 296
 297 config SMALL_STACK
 298         def_bool n
 299         prompt "Use 8kb for kernel stack instead of 16kb"
 300         depends on PACK_STACK && 64BIT && !LOCKDEP
 301         help
 302           If you say Y here and the compiler supports the -mkernel-backchain
 303           option the kernel will use a smaller kernel stack size. The reduced
 304           size is 8kb instead of 16kb. This allows to run more threads on a
 305           system and reduces the pressure on the memory management for higher
 306           order page allocations.
 307
 308           Say N if you are unsure.
 309
 310 config CHECK_STACK
 311         def_bool y
 312         prompt "Detect kernel stack overflow"
 313         help
 314           This option enables the compiler option -mstack-guard and
 315           -mstack-size if they are available. If the compiler supports them
 316           it will emit additional code to each function prolog to trigger
 317           an illegal operation if the kernel stack is about to overflow.
 318
 319           Say N if you are unsure.
 320
 321 config STACK_GUARD
 322         int "Size of the guard area (128-1024)"
 323         range 128 1024
 324         depends on CHECK_STACK
 325         default "256"
 326         help
 327           This allows you to specify the size of the guard area at the lower
 328           end of the kernel stack. If the kernel stack points into the guard
 329           area on function entry an illegal operation is triggered. The size
 330           needs to be a power of 2. Please keep in mind that the size of an
 331           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 332           The minimum size for the stack guard should be 256 for 31 bit and
 333           512 for 64 bit.
 334
 335 config WARN_DYNAMIC_STACK
 336         def_bool n
 337         prompt "Emit compiler warnings for function with dynamic stack usage"
 338         help
 339           This option enables the compiler option -mwarn-dynamicstack. If the
 340           compiler supports this options generates warnings for functions
 341           that dynamically allocate stack space using alloca.
 342
 343           Say N if you are unsure.
 344
 345 comment "Kernel preemption"
 346
 347 source "kernel/Kconfig.preempt"
 348
 349 config ARCH_SPARSEMEM_ENABLE
 350         def_bool y
 351         select SPARSEMEM_VMEMMAP_ENABLE
 352         select SPARSEMEM_VMEMMAP
 353         select SPARSEMEM_STATIC if !64BIT
 354
 355 config ARCH_SPARSEMEM_DEFAULT
 356         def_bool y
 357
 358 config ARCH_SELECT_MEMORY_MODEL
 359         def_bool y
 360
 361 config ARCH_ENABLE_MEMORY_HOTPLUG
 362         def_bool y if SPARSEMEM
 363
 364 config ARCH_ENABLE_MEMORY_HOTREMOVE
 365         def_bool y
 366
 367 config ARCH_HIBERNATION_POSSIBLE
 368         def_bool y if 64BIT
 369
 370 source "mm/Kconfig"
 371
 372 comment "I/O subsystem configuration"
 373
 374 config QDIO
 375         def_tristate y
 376         prompt "QDIO support"
 377         ---help---
 378           This driver provides the Queued Direct I/O base support for
 379           IBM System z.
 380
 381           To compile this driver as a module, choose M here: the
 382           module will be called qdio.
 383
 384           If unsure, say Y.
 385
 386 config CHSC_SCH
 387         def_tristate m
 388         prompt "Support for CHSC subchannels"
 389         help
 390           This driver allows usage of CHSC subchannels. A CHSC subchannel
 391           is usually present on LPAR only.
 392           The driver creates a device /dev/chsc, which may be used to
 393           obtain I/O configuration information about the machine and
 394           to issue asynchronous chsc commands (DANGEROUS).
 395           You will usually only want to use this interface on a special
 396           LPAR designated for system management.
 397
 398           To compile this driver as a module, choose M here: the
 399           module will be called chsc_sch.
 400
 401           If unsure, say N.
 402
 403 comment "Misc"
 404
 405 config IPL
 406         def_bool y
 407         prompt "Builtin IPL record support"
 408         help
 409           If you want to use the produced kernel to IPL directly from a
 410           device, you have to merge a bootsector specific to the device
 411           into the first bytes of the kernel. You will have to select the
 412           IPL device.
 413
 414 choice
 415         prompt "IPL method generated into head.S"
 416         depends on IPL
 417         default IPL_VM
 418         help
 419           Select "tape" if you want to IPL the image from a Tape.
 420
 421           Select "vm_reader" if you are running under VM/ESA and want
 422           to IPL the image from the emulated card reader.
 423
 424 config IPL_TAPE
 425         bool "tape"
 426
 427 config IPL_VM
 428         bool "vm_reader"
 429
 430 endchoice
 431
 432 source "fs/Kconfig.binfmt"
 433
 434 config FORCE_MAX_ZONEORDER
 435         int
 436         default "9"
 437
 438 config PFAULT
 439         def_bool y
 440         prompt "Pseudo page fault support"
 441         help
 442           Select this option, if you want to use PFAULT pseudo page fault
 443           handling under VM. If running native or in LPAR, this option
 444           has no effect. If your VM does not support PFAULT, PAGEEX
 445           pseudo page fault handling will be used.
 446           Note that VM 4.2 supports PFAULT but has a bug in its
 447           implementation that causes some problems.
 448           Everybody who wants to run Linux under VM != VM4.2 should select
 449           this option.
 450
 451 config SHARED_KERNEL
 452         def_bool y
 453         prompt "VM shared kernel support"
 454         help
 455           Select this option, if you want to share the text segment of the
 456           Linux kernel between different VM guests. This reduces memory
 457           usage with lots of guests but greatly increases kernel size.
 458           Also if a kernel was IPL'ed from a shared segment the kexec system
 459           call will not work.
 460           You should only select this option if you know what you are
 461           doing and want to exploit this feature.
 462
 463 config CMM
 464         def_tristate n
 465         prompt "Cooperative memory management"
 466         help
 467           Select this option, if you want to enable the kernel interface
 468           to reduce the memory size of the system. This is accomplished
 469           by allocating pages of memory and put them "on hold". This only
 470           makes sense for a system running under VM where the unused pages
 471           will be reused by VM for other guest systems. The interface
 472           allows an external monitor to balance memory of many systems.
 473           Everybody who wants to run Linux under VM should select this
 474           option.
 475
 476 config CMM_IUCV
 477         def_bool y
 478         prompt "IUCV special message interface to cooperative memory management"
 479         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 480         help
 481           Select this option to enable the special message interface to
 482           the cooperative memory management.
 483
 484 config APPLDATA_BASE
 485         def_bool n
 486         prompt "Linux - VM Monitor Stream, base infrastructure"
 487         depends on PROC_FS
 488         help
 489           This provides a kernel interface for creating and updating z/VM APPLDATA
 490           monitor records. The monitor records are updated at certain time
 491           intervals, once the timer is started.
 492           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 493           i.e. enables or disables monitoring on the Linux side.
 494           A custom interval value (in seconds) can be written to
 495           /proc/appldata/interval.
 496
 497           Defaults are 60 seconds interval and timer off.
 498           The /proc entries can also be read from, showing the current settings.
 499
 500 config APPLDATA_MEM
 501         def_tristate m
 502         prompt "Monitor memory management statistics"
 503         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 504         help
 505           This provides memory management related data to the Linux - VM Monitor
 506           Stream, like paging/swapping rate, memory utilisation, etc.
 507           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 508           APPLDATA monitor record, i.e. enables or disables monitoring this record
 509           on the z/VM side.
 510
 511           Default is disabled.
 512           The /proc entry can also be read from, showing the current settings.
 513
 514           This can also be compiled as a module, which will be called
 515           appldata_mem.o.
 516
 517 config APPLDATA_OS
 518         def_tristate m
 519         prompt "Monitor OS statistics"
 520         depends on APPLDATA_BASE
 521         help
 522           This provides OS related data to the Linux - VM Monitor Stream, like
 523           CPU utilisation, etc.
 524           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 525           APPLDATA monitor record, i.e. enables or disables monitoring this record
 526           on the z/VM side.
 527
 528           Default is disabled.
 529           This can also be compiled as a module, which will be called
 530           appldata_os.o.
 531
 532 config APPLDATA_NET_SUM
 533         def_tristate m
 534         prompt "Monitor overall network statistics"
 535         depends on APPLDATA_BASE && NET
 536         help
 537           This provides network related data to the Linux - VM Monitor Stream,
 538           currently there is only a total sum of network I/O statistics, no
 539           per-interface data.
 540           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 541           APPLDATA monitor record, i.e. enables or disables monitoring this record
 542           on the z/VM side.
 543
 544           Default is disabled.
 545           This can also be compiled as a module, which will be called
 546           appldata_net_sum.o.
 547
 548 source kernel/Kconfig.hz
 549
 550 config S390_HYPFS_FS
 551         def_bool y
 552         prompt "s390 hypervisor file system support"
 553         select SYS_HYPERVISOR
 554         help
 555           This is a virtual file system intended to provide accounting
 556           information in an s390 hypervisor environment.
 557
 558 config KEXEC
 559         def_bool n
 560         prompt "kexec system call"
 561         help
 562           kexec is a system call that implements the ability to shutdown your
 563           current kernel, and to start another kernel.  It is like a reboot
 564           but is independent of hardware/microcode support.
 565
 566 config CRASH_DUMP
 567         bool "kernel crash dumps"
 568         depends on 64BIT
 569         select KEXEC
 570         help
 571           Generate crash dump after being started by kexec.
 572           Crash dump kernels are loaded in the main kernel with kexec-tools
 573           into a specially reserved region and then later executed after
 574           a crash by kdump/kexec.
 575           For more details see Documentation/kdump/kdump.txt
 576
 577 config ZFCPDUMP
 578         def_bool n
 579         prompt "zfcpdump support"
 580         select SMP
 581         help
 582           Select this option if you want to build an zfcpdump enabled kernel.
 583           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 584
 585 config S390_GUEST
 586         def_bool y
 587         prompt "s390 guest support for KVM (EXPERIMENTAL)"
 588         depends on 64BIT && EXPERIMENTAL
 589         select VIRTUALIZATION
 590         select VIRTIO
 591         select VIRTIO_RING
 592         select VIRTIO_CONSOLE
 593         help
 594           Select this option if you want to run the kernel as a guest under
 595           the KVM hypervisor. This will add detection for KVM as well  as a
 596           virtio transport. If KVM is detected, the virtio console will be
 597           the default console.
 598
 599 config SECCOMP
 600         def_bool y
 601         prompt "Enable seccomp to safely compute untrusted bytecode"
 602         depends on PROC_FS
 603         help
 604           This kernel feature is useful for number crunching applications
 605           that may need to compute untrusted bytecode during their
 606           execution. By using pipes or other transports made available to
 607           the process as file descriptors supporting the read/write
 608           syscalls, it's possible to isolate those applications in
 609           their own address space using seccomp. Once seccomp is
 610           enabled via /proc/<pid>/seccomp, it cannot be disabled
 611           and the task is only allowed to execute a few safe syscalls
 612           defined by each seccomp mode.
 613
 614           If unsure, say Y.
 615
 616 endmenu
 617
 618 menu "Power Management"
 619
 620 source "kernel/power/Kconfig"
 621
 622 endmenu
 623
 624 source "net/Kconfig"
 625
 626 config PCMCIA
 627         def_bool n
 628
 629 config CCW
 630         def_bool y
 631
 632 source "drivers/Kconfig"
 633
 634 source "fs/Kconfig"
 635
 636 source "arch/s390/Kconfig.debug"
 637
 638 source "security/Kconfig"
 639
 640 source "crypto/Kconfig"
 641
 642 source "lib/Kconfig"
 643
 644 source "arch/s390/kvm/Kconfig"