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_GET_USER_PAGES_FAST
  91         select HAVE_ARCH_MUTEX_CPU_RELAX
  92         select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
  93         select HAVE_RCU_TABLE_FREE if SMP
  94         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
  95         select ARCH_INLINE_SPIN_TRYLOCK
  96         select ARCH_INLINE_SPIN_TRYLOCK_BH
  97         select ARCH_INLINE_SPIN_LOCK
  98         select ARCH_INLINE_SPIN_LOCK_BH
  99         select ARCH_INLINE_SPIN_LOCK_IRQ
 100         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
 101         select ARCH_INLINE_SPIN_UNLOCK
 102         select ARCH_INLINE_SPIN_UNLOCK_BH
 103         select ARCH_INLINE_SPIN_UNLOCK_IRQ
 104         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
 105         select ARCH_INLINE_READ_TRYLOCK
 106         select ARCH_INLINE_READ_LOCK
 107         select ARCH_INLINE_READ_LOCK_BH
 108         select ARCH_INLINE_READ_LOCK_IRQ
 109         select ARCH_INLINE_READ_LOCK_IRQSAVE
 110         select ARCH_INLINE_READ_UNLOCK
 111         select ARCH_INLINE_READ_UNLOCK_BH
 112         select ARCH_INLINE_READ_UNLOCK_IRQ
 113         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
 114         select ARCH_INLINE_WRITE_TRYLOCK
 115         select ARCH_INLINE_WRITE_LOCK
 116         select ARCH_INLINE_WRITE_LOCK_BH
 117         select ARCH_INLINE_WRITE_LOCK_IRQ
 118         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 119         select ARCH_INLINE_WRITE_UNLOCK
 120         select ARCH_INLINE_WRITE_UNLOCK_BH
 121         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 122         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 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 source "kernel/time/Kconfig"
 136
 137 config 64BIT
 138         def_bool y
 139         prompt "64 bit kernel"
 140         help
 141           Select this option if you have an IBM z/Architecture machine
 142           and want to use the 64 bit addressing mode.
 143
 144 config 32BIT
 145         def_bool y if !64BIT
 146
 147 config KTIME_SCALAR
 148         def_bool 32BIT
 149
 150 config SMP
 151         def_bool y
 152         prompt "Symmetric multi-processing support"
 153         ---help---
 154           This enables support for systems with more than one CPU. If you have
 155           a system with only one CPU, like most personal computers, say N. If
 156           you have a system with more than one CPU, say Y.
 157
 158           If you say N here, the kernel will run on single and multiprocessor
 159           machines, but will use only one CPU of a multiprocessor machine. If
 160           you say Y here, the kernel will run on many, but not all,
 161           singleprocessor machines. On a singleprocessor machine, the kernel
 162           will run faster if you say N here.
 163
 164           See also the SMP-HOWTO available at
 165           <http://www.tldp.org/docs.html#howto>.
 166
 167           Even if you don't know what to do here, say Y.
 168
 169 config NR_CPUS
 170         int "Maximum number of CPUs (2-64)"
 171         range 2 64
 172         depends on SMP
 173         default "32" if !64BIT
 174         default "64" if 64BIT
 175         help
 176           This allows you to specify the maximum number of CPUs which this
 177           kernel will support.  The maximum supported value is 64 and the
 178           minimum value which makes sense is 2.
 179
 180           This is purely to save memory - each supported CPU adds
 181           approximately sixteen kilobytes to the kernel image.
 182
 183 config HOTPLUG_CPU
 184         def_bool y
 185         prompt "Support for hot-pluggable CPUs"
 186         depends on SMP
 187         select HOTPLUG
 188         help
 189           Say Y here to be able to turn CPUs off and on. CPUs
 190           can be controlled through /sys/devices/system/cpu/cpu#.
 191           Say N if you want to disable CPU hotplug.
 192
 193 config SCHED_MC
 194         def_bool n
 195
 196 config SCHED_BOOK
 197         def_bool y
 198         prompt "Book scheduler support"
 199         depends on SMP
 200         select SCHED_MC
 201         help
 202           Book scheduler support improves the CPU scheduler's decision making
 203           when dealing with machines that have several books.
 204
 205 config MATHEMU
 206         def_bool y
 207         prompt "IEEE FPU emulation"
 208         depends on MARCH_G5
 209         help
 210           This option is required for IEEE compliant floating point arithmetic
 211           on older ESA/390 machines. Say Y unless you know your machine doesn't
 212           need this.
 213
 214 config COMPAT
 215         def_bool y
 216         prompt "Kernel support for 31 bit emulation"
 217         depends on 64BIT
 218         select COMPAT_BINFMT_ELF
 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 AUDIT_ARCH
 229         def_bool y
 230
 231 comment "Code generation options"
 232
 233 choice
 234         prompt "Processor type"
 235         default MARCH_G5
 236
 237 config MARCH_G5
 238         bool "System/390 model G5 and G6"
 239         depends on !64BIT
 240         help
 241           Select this to build a 31 bit kernel that works
 242           on all ESA/390 and z/Architecture machines.
 243
 244 config MARCH_Z900
 245         bool "IBM zSeries model z800 and z900"
 246         help
 247           Select this to enable optimizations for model z800/z900 (2064 and
 248           2066 series). This will enable some optimizations that are not
 249           available on older ESA/390 (31 Bit) only CPUs.
 250
 251 config MARCH_Z990
 252         bool "IBM zSeries model z890 and z990"
 253         help
 254           Select this to enable optimizations for model z890/z990 (2084 and
 255           2086 series). The kernel will be slightly faster but will not work
 256           on older machines.
 257
 258 config MARCH_Z9_109
 259         bool "IBM System z9"
 260         help
 261           Select this to enable optimizations for IBM System z9 (2094 and
 262           2096 series). The kernel will be slightly faster but will not work
 263           on older machines.
 264
 265 config MARCH_Z10
 266         bool "IBM System z10"
 267         help
 268           Select this to enable optimizations for IBM System z10 (2097 and
 269           2098 series). The kernel will be slightly faster but will not work
 270           on older machines.
 271
 272 config MARCH_Z196
 273         bool "IBM zEnterprise 114 and 196"
 274         help
 275           Select this to enable optimizations for IBM zEnterprise 114 and 196
 276           (2818 and 2817 series). The kernel will be slightly faster but will
 277           not work on older machines.
 278
 279 endchoice
 280
 281 config PACK_STACK
 282         def_bool y
 283         prompt "Pack kernel stack"
 284         help
 285           This option enables the compiler option -mkernel-backchain if it
 286           is available. If the option is available the compiler supports
 287           the new stack layout which dramatically reduces the minimum stack
 288           frame size. With an old compiler a non-leaf function needs a
 289           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 290           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 291           and 24 byte on 64 bit.
 292
 293           Say Y if you are unsure.
 294
 295 config SMALL_STACK
 296         def_bool n
 297         prompt "Use 8kb for kernel stack instead of 16kb"
 298         depends on PACK_STACK && 64BIT && !LOCKDEP
 299         help
 300           If you say Y here and the compiler supports the -mkernel-backchain
 301           option the kernel will use a smaller kernel stack size. The reduced
 302           size is 8kb instead of 16kb. This allows to run more threads on a
 303           system and reduces the pressure on the memory management for higher
 304           order page allocations.
 305
 306           Say N if you are unsure.
 307
 308 config CHECK_STACK
 309         def_bool y
 310         prompt "Detect kernel stack overflow"
 311         help
 312           This option enables the compiler option -mstack-guard and
 313           -mstack-size if they are available. If the compiler supports them
 314           it will emit additional code to each function prolog to trigger
 315           an illegal operation if the kernel stack is about to overflow.
 316
 317           Say N if you are unsure.
 318
 319 config STACK_GUARD
 320         int "Size of the guard area (128-1024)"
 321         range 128 1024
 322         depends on CHECK_STACK
 323         default "256"
 324         help
 325           This allows you to specify the size of the guard area at the lower
 326           end of the kernel stack. If the kernel stack points into the guard
 327           area on function entry an illegal operation is triggered. The size
 328           needs to be a power of 2. Please keep in mind that the size of an
 329           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 330           The minimum size for the stack guard should be 256 for 31 bit and
 331           512 for 64 bit.
 332
 333 config WARN_DYNAMIC_STACK
 334         def_bool n
 335         prompt "Emit compiler warnings for function with dynamic stack usage"
 336         help
 337           This option enables the compiler option -mwarn-dynamicstack. If the
 338           compiler supports this options generates warnings for functions
 339           that dynamically allocate stack space using alloca.
 340
 341           Say N if you are unsure.
 342
 343 config ARCH_POPULATES_NODE_MAP
 344         def_bool y
 345
 346 comment "Kernel preemption"
 347
 348 source "kernel/Kconfig.preempt"
 349
 350 config ARCH_SPARSEMEM_ENABLE
 351         def_bool y
 352         select SPARSEMEM_VMEMMAP_ENABLE
 353         select SPARSEMEM_VMEMMAP
 354         select SPARSEMEM_STATIC if !64BIT
 355
 356 config ARCH_SPARSEMEM_DEFAULT
 357         def_bool y
 358
 359 config ARCH_SELECT_MEMORY_MODEL
 360         def_bool y
 361
 362 config ARCH_ENABLE_MEMORY_HOTPLUG
 363         def_bool y if SPARSEMEM
 364
 365 config ARCH_ENABLE_MEMORY_HOTREMOVE
 366         def_bool y
 367
 368 config ARCH_HIBERNATION_POSSIBLE
 369         def_bool y if 64BIT
 370
 371 source "mm/Kconfig"
 372
 373 comment "I/O subsystem configuration"
 374
 375 config QDIO
 376         def_tristate y
 377         prompt "QDIO support"
 378         ---help---
 379           This driver provides the Queued Direct I/O base support for
 380           IBM System z.
 381
 382           To compile this driver as a module, choose M here: the
 383           module will be called qdio.
 384
 385           If unsure, say Y.
 386
 387 config CHSC_SCH
 388         def_tristate m
 389         prompt "Support for CHSC subchannels"
 390         help
 391           This driver allows usage of CHSC subchannels. A CHSC subchannel
 392           is usually present on LPAR only.
 393           The driver creates a device /dev/chsc, which may be used to
 394           obtain I/O configuration information about the machine and
 395           to issue asynchronous chsc commands (DANGEROUS).
 396           You will usually only want to use this interface on a special
 397           LPAR designated for system management.
 398
 399           To compile this driver as a module, choose M here: the
 400           module will be called chsc_sch.
 401
 402           If unsure, say N.
 403
 404 comment "Misc"
 405
 406 config IPL
 407         def_bool y
 408         prompt "Builtin IPL record support"
 409         help
 410           If you want to use the produced kernel to IPL directly from a
 411           device, you have to merge a bootsector specific to the device
 412           into the first bytes of the kernel. You will have to select the
 413           IPL device.
 414
 415 choice
 416         prompt "IPL method generated into head.S"
 417         depends on IPL
 418         default IPL_VM
 419         help
 420           Select "tape" if you want to IPL the image from a Tape.
 421
 422           Select "vm_reader" if you are running under VM/ESA and want
 423           to IPL the image from the emulated card reader.
 424
 425 config IPL_TAPE
 426         bool "tape"
 427
 428 config IPL_VM
 429         bool "vm_reader"
 430
 431 endchoice
 432
 433 source "fs/Kconfig.binfmt"
 434
 435 config FORCE_MAX_ZONEORDER
 436         int
 437         default "9"
 438
 439 config PFAULT
 440         def_bool y
 441         prompt "Pseudo page fault support"
 442         help
 443           Select this option, if you want to use PFAULT pseudo page fault
 444           handling under VM. If running native or in LPAR, this option
 445           has no effect. If your VM does not support PFAULT, PAGEEX
 446           pseudo page fault handling will be used.
 447           Note that VM 4.2 supports PFAULT but has a bug in its
 448           implementation that causes some problems.
 449           Everybody who wants to run Linux under VM != VM4.2 should select
 450           this option.
 451
 452 config SHARED_KERNEL
 453         def_bool y
 454         prompt "VM shared kernel support"
 455         help
 456           Select this option, if you want to share the text segment of the
 457           Linux kernel between different VM guests. This reduces memory
 458           usage with lots of guests but greatly increases kernel size.
 459           Also if a kernel was IPL'ed from a shared segment the kexec system
 460           call will not work.
 461           You should only select this option if you know what you are
 462           doing and want to exploit this feature.
 463
 464 config CMM
 465         def_tristate n
 466         prompt "Cooperative memory management"
 467         help
 468           Select this option, if you want to enable the kernel interface
 469           to reduce the memory size of the system. This is accomplished
 470           by allocating pages of memory and put them "on hold". This only
 471           makes sense for a system running under VM where the unused pages
 472           will be reused by VM for other guest systems. The interface
 473           allows an external monitor to balance memory of many systems.
 474           Everybody who wants to run Linux under VM should select this
 475           option.
 476
 477 config CMM_IUCV
 478         def_bool y
 479         prompt "IUCV special message interface to cooperative memory management"
 480         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 481         help
 482           Select this option to enable the special message interface to
 483           the cooperative memory management.
 484
 485 config APPLDATA_BASE
 486         def_bool n
 487         prompt "Linux - VM Monitor Stream, base infrastructure"
 488         depends on PROC_FS
 489         help
 490           This provides a kernel interface for creating and updating z/VM APPLDATA
 491           monitor records. The monitor records are updated at certain time
 492           intervals, once the timer is started.
 493           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 494           i.e. enables or disables monitoring on the Linux side.
 495           A custom interval value (in seconds) can be written to
 496           /proc/appldata/interval.
 497
 498           Defaults are 60 seconds interval and timer off.
 499           The /proc entries can also be read from, showing the current settings.
 500
 501 config APPLDATA_MEM
 502         def_tristate m
 503         prompt "Monitor memory management statistics"
 504         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 505         help
 506           This provides memory management related data to the Linux - VM Monitor
 507           Stream, like paging/swapping rate, memory utilisation, etc.
 508           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 509           APPLDATA monitor record, i.e. enables or disables monitoring this record
 510           on the z/VM side.
 511
 512           Default is disabled.
 513           The /proc entry can also be read from, showing the current settings.
 514
 515           This can also be compiled as a module, which will be called
 516           appldata_mem.o.
 517
 518 config APPLDATA_OS
 519         def_tristate m
 520         prompt "Monitor OS statistics"
 521         depends on APPLDATA_BASE
 522         help
 523           This provides OS related data to the Linux - VM Monitor Stream, like
 524           CPU utilisation, etc.
 525           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 526           APPLDATA monitor record, i.e. enables or disables monitoring this record
 527           on the z/VM side.
 528
 529           Default is disabled.
 530           This can also be compiled as a module, which will be called
 531           appldata_os.o.
 532
 533 config APPLDATA_NET_SUM
 534         def_tristate m
 535         prompt "Monitor overall network statistics"
 536         depends on APPLDATA_BASE && NET
 537         help
 538           This provides network related data to the Linux - VM Monitor Stream,
 539           currently there is only a total sum of network I/O statistics, no
 540           per-interface data.
 541           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 542           APPLDATA monitor record, i.e. enables or disables monitoring this record
 543           on the z/VM side.
 544
 545           Default is disabled.
 546           This can also be compiled as a module, which will be called
 547           appldata_net_sum.o.
 548
 549 source kernel/Kconfig.hz
 550
 551 config S390_HYPFS_FS
 552         def_bool y
 553         prompt "s390 hypervisor file system support"
 554         select SYS_HYPERVISOR
 555         help
 556           This is a virtual file system intended to provide accounting
 557           information in an s390 hypervisor environment.
 558
 559 config KEXEC
 560         def_bool n
 561         prompt "kexec system call"
 562         help
 563           kexec is a system call that implements the ability to shutdown your
 564           current kernel, and to start another kernel.  It is like a reboot
 565           but is independent of hardware/microcode support.
 566
 567 config CRASH_DUMP
 568         bool "kernel crash dumps"
 569         depends on 64BIT
 570         select KEXEC
 571         help
 572           Generate crash dump after being started by kexec.
 573           Crash dump kernels are loaded in the main kernel with kexec-tools
 574           into a specially reserved region and then later executed after
 575           a crash by kdump/kexec.
 576           For more details see Documentation/kdump/kdump.txt
 577
 578 config ZFCPDUMP
 579         def_bool n
 580         prompt "zfcpdump support"
 581         select SMP
 582         help
 583           Select this option if you want to build an zfcpdump enabled kernel.
 584           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 585
 586 config S390_GUEST
 587         def_bool y
 588         prompt "s390 guest support for KVM (EXPERIMENTAL)"
 589         depends on 64BIT && EXPERIMENTAL
 590         select VIRTUALIZATION
 591         select VIRTIO
 592         select VIRTIO_RING
 593         select VIRTIO_CONSOLE
 594         help
 595           Select this option if you want to run the kernel as a guest under
 596           the KVM hypervisor. This will add detection for KVM as well  as a
 597           virtio transport. If KVM is detected, the virtio console will be
 598           the default console.
 599
 600 config SECCOMP
 601         def_bool y
 602         prompt "Enable seccomp to safely compute untrusted bytecode"
 603         depends on PROC_FS
 604         help
 605           This kernel feature is useful for number crunching applications
 606           that may need to compute untrusted bytecode during their
 607           execution. By using pipes or other transports made available to
 608           the process as file descriptors supporting the read/write
 609           syscalls, it's possible to isolate those applications in
 610           their own address space using seccomp. Once seccomp is
 611           enabled via /proc/<pid>/seccomp, it cannot be disabled
 612           and the task is only allowed to execute a few safe syscalls
 613           defined by each seccomp mode.
 614
 615           If unsure, say Y.
 616
 617 endmenu
 618
 619 menu "Power Management"
 620
 621 source "kernel/power/Kconfig"
 622
 623 endmenu
 624
 625 source "net/Kconfig"
 626
 627 config PCMCIA
 628         def_bool n
 629
 630 config CCW
 631         def_bool y
 632
 633 source "drivers/Kconfig"
 634
 635 source "fs/Kconfig"
 636
 637 source "arch/s390/Kconfig.debug"
 638
 639 source "security/Kconfig"
 640
 641 source "crypto/Kconfig"
 642
 643 source "lib/Kconfig"
 644
 645 source "arch/s390/kvm/Kconfig"