arch/s390/Kconfig

   1 config MMU
   2         def_bool y
   3
   4 config ZONE_DMA
   5         def_bool y
   6
   7 config LOCKDEP_SUPPORT
   8         def_bool y
   9
  10 config STACKTRACE_SUPPORT
  11         def_bool y
  12
  13 config HAVE_LATENCYTOP_SUPPORT
  14         def_bool y
  15
  16 config RWSEM_GENERIC_SPINLOCK
  17         bool
  18
  19 config RWSEM_XCHGADD_ALGORITHM
  20         def_bool y
  21
  22 config ARCH_HAS_ILOG2_U32
  23         def_bool n
  24
  25 config ARCH_HAS_ILOG2_U64
  26         def_bool n
  27
  28 config GENERIC_HWEIGHT
  29         def_bool y
  30
  31 config GENERIC_BUG
  32         def_bool y if BUG
  33
  34 config GENERIC_BUG_RELATIVE_POINTERS
  35         def_bool y
  36
  37 config NO_IOMEM
  38         def_bool y
  39
  40 config NO_DMA
  41         def_bool y
  42
  43 config ARCH_DMA_ADDR_T_64BIT
  44         def_bool 64BIT
  45
  46 config GENERIC_LOCKBREAK
  47         def_bool y if SMP && PREEMPT
  48
  49 config PGSTE
  50         def_bool y if KVM
  51
  52 config VIRT_CPU_ACCOUNTING
  53         def_bool y
  54
  55 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  56         def_bool y
  57
  58 config S390
  59         def_bool y
  60         select USE_GENERIC_SMP_HELPERS if SMP
  61         select GENERIC_CPU_DEVICES if !SMP
  62         select HAVE_SYSCALL_WRAPPERS
  63         select HAVE_FUNCTION_TRACER
  64         select HAVE_FUNCTION_TRACE_MCOUNT_TEST
  65         select HAVE_FTRACE_MCOUNT_RECORD
  66         select HAVE_C_RECORDMCOUNT
  67         select HAVE_SYSCALL_TRACEPOINTS
  68         select HAVE_DYNAMIC_FTRACE
  69         select HAVE_FUNCTION_GRAPH_TRACER
  70         select HAVE_REGS_AND_STACK_ACCESS_API
  71         select HAVE_OPROFILE
  72         select HAVE_KPROBES
  73         select HAVE_KRETPROBES
  74         select HAVE_KVM if 64BIT
  75         select HAVE_ARCH_TRACEHOOK
  76         select INIT_ALL_POSSIBLE
  77         select HAVE_IRQ_WORK
  78         select HAVE_PERF_EVENTS
  79         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  80         select HAVE_KERNEL_GZIP
  81         select HAVE_KERNEL_BZIP2
  82         select HAVE_KERNEL_LZMA
  83         select HAVE_KERNEL_LZO
  84         select HAVE_KERNEL_XZ
  85         select HAVE_ARCH_MUTEX_CPU_RELAX
  86         select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
  87         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
  88         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  89         select HAVE_MEMBLOCK
  90         select HAVE_MEMBLOCK_NODE_MAP
  91         select HAVE_CMPXCHG_LOCAL
  92         select ARCH_DISCARD_MEMBLOCK
  93         select BUILDTIME_EXTABLE_SORT
  94         select ARCH_INLINE_SPIN_TRYLOCK
  95         select ARCH_INLINE_SPIN_TRYLOCK_BH
  96         select ARCH_INLINE_SPIN_LOCK
  97         select ARCH_INLINE_SPIN_LOCK_BH
  98         select ARCH_INLINE_SPIN_LOCK_IRQ
  99         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
 100         select ARCH_INLINE_SPIN_UNLOCK
 101         select ARCH_INLINE_SPIN_UNLOCK_BH
 102         select ARCH_INLINE_SPIN_UNLOCK_IRQ
 103         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
 104         select ARCH_INLINE_READ_TRYLOCK
 105         select ARCH_INLINE_READ_LOCK
 106         select ARCH_INLINE_READ_LOCK_BH
 107         select ARCH_INLINE_READ_LOCK_IRQ
 108         select ARCH_INLINE_READ_LOCK_IRQSAVE
 109         select ARCH_INLINE_READ_UNLOCK
 110         select ARCH_INLINE_READ_UNLOCK_BH
 111         select ARCH_INLINE_READ_UNLOCK_IRQ
 112         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
 113         select ARCH_INLINE_WRITE_TRYLOCK
 114         select ARCH_INLINE_WRITE_LOCK
 115         select ARCH_INLINE_WRITE_LOCK_BH
 116         select ARCH_INLINE_WRITE_LOCK_IRQ
 117         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 118         select ARCH_INLINE_WRITE_UNLOCK
 119         select ARCH_INLINE_WRITE_UNLOCK_BH
 120         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 121         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 122         select ARCH_WANT_IPC_PARSE_VERSION
 123         select GENERIC_SMP_IDLE_THREAD
 124         select GENERIC_TIME_VSYSCALL
 125         select GENERIC_CLOCKEVENTS
 126         select KTIME_SCALAR if 32BIT
 127         select HAVE_ARCH_SECCOMP_FILTER
 128         select HAVE_MOD_ARCH_SPECIFIC
 129         select MODULES_USE_ELF_RELA
 130
 131 config SCHED_OMIT_FRAME_POINTER
 132         def_bool y
 133
 134 source "init/Kconfig"
 135
 136 source "kernel/Kconfig.freezer"
 137
 138 menu "Base setup"
 139
 140 comment "Processor type and features"
 141
 142 config 64BIT
 143         def_bool y
 144         prompt "64 bit kernel"
 145         help
 146           Select this option if you have an IBM z/Architecture machine
 147           and want to use the 64 bit addressing mode.
 148
 149 config 32BIT
 150         def_bool y if !64BIT
 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 if BINFMT_ELF
 221         select ARCH_WANT_OLD_COMPAT_IPC
 222         help
 223           Select this option if you want to enable your system kernel to
 224           handle system-calls from ELF binaries for 31 bit ESA.  This option
 225           (and some other stuff like libraries and such) is needed for
 226           executing 31 bit applications.  It is safe to say "Y".
 227
 228 config SYSVIPC_COMPAT
 229         def_bool y if COMPAT && SYSVIPC
 230
 231 config KEYS_COMPAT
 232         def_bool y if COMPAT && KEYS
 233
 234 config AUDIT_ARCH
 235         def_bool y
 236
 237 config HAVE_MARCH_Z900_FEATURES
 238         def_bool n
 239
 240 config HAVE_MARCH_Z990_FEATURES
 241         def_bool n
 242         select HAVE_MARCH_Z900_FEATURES
 243
 244 config HAVE_MARCH_Z9_109_FEATURES
 245         def_bool n
 246         select HAVE_MARCH_Z990_FEATURES
 247
 248 config HAVE_MARCH_Z10_FEATURES
 249         def_bool n
 250         select HAVE_MARCH_Z9_109_FEATURES
 251
 252 config HAVE_MARCH_Z196_FEATURES
 253         def_bool n
 254         select HAVE_MARCH_Z10_FEATURES
 255
 256 comment "Code generation options"
 257
 258 choice
 259         prompt "Processor type"
 260         default MARCH_G5
 261
 262 config MARCH_G5
 263         bool "System/390 model G5 and G6"
 264         depends on !64BIT
 265         help
 266           Select this to build a 31 bit kernel that works
 267           on all ESA/390 and z/Architecture machines.
 268
 269 config MARCH_Z900
 270         bool "IBM zSeries model z800 and z900"
 271         select HAVE_MARCH_Z900_FEATURES if 64BIT
 272         help
 273           Select this to enable optimizations for model z800/z900 (2064 and
 274           2066 series). This will enable some optimizations that are not
 275           available on older ESA/390 (31 Bit) only CPUs.
 276
 277 config MARCH_Z990
 278         bool "IBM zSeries model z890 and z990"
 279         select HAVE_MARCH_Z990_FEATURES if 64BIT
 280         help
 281           Select this to enable optimizations for model z890/z990 (2084 and
 282           2086 series). The kernel will be slightly faster but will not work
 283           on older machines.
 284
 285 config MARCH_Z9_109
 286         bool "IBM System z9"
 287         select HAVE_MARCH_Z9_109_FEATURES if 64BIT
 288         help
 289           Select this to enable optimizations for IBM System z9 (2094 and
 290           2096 series). The kernel will be slightly faster but will not work
 291           on older machines.
 292
 293 config MARCH_Z10
 294         bool "IBM System z10"
 295         select HAVE_MARCH_Z10_FEATURES if 64BIT
 296         help
 297           Select this to enable optimizations for IBM System z10 (2097 and
 298           2098 series). The kernel will be slightly faster but will not work
 299           on older machines.
 300
 301 config MARCH_Z196
 302         bool "IBM zEnterprise 114 and 196"
 303         select HAVE_MARCH_Z196_FEATURES if 64BIT
 304         help
 305           Select this to enable optimizations for IBM zEnterprise 114 and 196
 306           (2818 and 2817 series). The kernel will be slightly faster but will
 307           not work on older machines.
 308
 309 endchoice
 310
 311 config PACK_STACK
 312         def_bool y
 313         prompt "Pack kernel stack"
 314         help
 315           This option enables the compiler option -mkernel-backchain if it
 316           is available. If the option is available the compiler supports
 317           the new stack layout which dramatically reduces the minimum stack
 318           frame size. With an old compiler a non-leaf function needs a
 319           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 320           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 321           and 24 byte on 64 bit.
 322
 323           Say Y if you are unsure.
 324
 325 config SMALL_STACK
 326         def_bool n
 327         prompt "Use 8kb for kernel stack instead of 16kb"
 328         depends on PACK_STACK && 64BIT && !LOCKDEP
 329         help
 330           If you say Y here and the compiler supports the -mkernel-backchain
 331           option the kernel will use a smaller kernel stack size. The reduced
 332           size is 8kb instead of 16kb. This allows to run more threads on a
 333           system and reduces the pressure on the memory management for higher
 334           order page allocations.
 335
 336           Say N if you are unsure.
 337
 338 config CHECK_STACK
 339         def_bool y
 340         prompt "Detect kernel stack overflow"
 341         help
 342           This option enables the compiler option -mstack-guard and
 343           -mstack-size if they are available. If the compiler supports them
 344           it will emit additional code to each function prolog to trigger
 345           an illegal operation if the kernel stack is about to overflow.
 346
 347           Say N if you are unsure.
 348
 349 config STACK_GUARD
 350         int "Size of the guard area (128-1024)"
 351         range 128 1024
 352         depends on CHECK_STACK
 353         default "256"
 354         help
 355           This allows you to specify the size of the guard area at the lower
 356           end of the kernel stack. If the kernel stack points into the guard
 357           area on function entry an illegal operation is triggered. The size
 358           needs to be a power of 2. Please keep in mind that the size of an
 359           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 360           The minimum size for the stack guard should be 256 for 31 bit and
 361           512 for 64 bit.
 362
 363 config WARN_DYNAMIC_STACK
 364         def_bool n
 365         prompt "Emit compiler warnings for function with dynamic stack usage"
 366         help
 367           This option enables the compiler option -mwarn-dynamicstack. If the
 368           compiler supports this options generates warnings for functions
 369           that dynamically allocate stack space using alloca.
 370
 371           Say N if you are unsure.
 372
 373 comment "Kernel preemption"
 374
 375 source "kernel/Kconfig.preempt"
 376
 377 config ARCH_SPARSEMEM_ENABLE
 378         def_bool y
 379         select SPARSEMEM_VMEMMAP_ENABLE
 380         select SPARSEMEM_VMEMMAP
 381         select SPARSEMEM_STATIC if !64BIT
 382
 383 config ARCH_SPARSEMEM_DEFAULT
 384         def_bool y
 385
 386 config ARCH_SELECT_MEMORY_MODEL
 387         def_bool y
 388
 389 config ARCH_ENABLE_MEMORY_HOTPLUG
 390         def_bool y if SPARSEMEM
 391
 392 config ARCH_ENABLE_MEMORY_HOTREMOVE
 393         def_bool y
 394
 395 config ARCH_HIBERNATION_POSSIBLE
 396         def_bool y if 64BIT
 397
 398 source "mm/Kconfig"
 399
 400 comment "I/O subsystem configuration"
 401
 402 config QDIO
 403         def_tristate y
 404         prompt "QDIO support"
 405         ---help---
 406           This driver provides the Queued Direct I/O base support for
 407           IBM System z.
 408
 409           To compile this driver as a module, choose M here: the
 410           module will be called qdio.
 411
 412           If unsure, say Y.
 413
 414 config CHSC_SCH
 415         def_tristate m
 416         prompt "Support for CHSC subchannels"
 417         help
 418           This driver allows usage of CHSC subchannels. A CHSC subchannel
 419           is usually present on LPAR only.
 420           The driver creates a device /dev/chsc, which may be used to
 421           obtain I/O configuration information about the machine and
 422           to issue asynchronous chsc commands (DANGEROUS).
 423           You will usually only want to use this interface on a special
 424           LPAR designated for system management.
 425
 426           To compile this driver as a module, choose M here: the
 427           module will be called chsc_sch.
 428
 429           If unsure, say N.
 430
 431 comment "Misc"
 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 && SMP
 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"