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 ARCH_INLINE_SPIN_TRYLOCK
  94         select ARCH_INLINE_SPIN_TRYLOCK_BH
  95         select ARCH_INLINE_SPIN_LOCK
  96         select ARCH_INLINE_SPIN_LOCK_BH
  97         select ARCH_INLINE_SPIN_LOCK_IRQ
  98         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
  99         select ARCH_INLINE_SPIN_UNLOCK
 100         select ARCH_INLINE_SPIN_UNLOCK_BH
 101         select ARCH_INLINE_SPIN_UNLOCK_IRQ
 102         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
 103         select ARCH_INLINE_READ_TRYLOCK
 104         select ARCH_INLINE_READ_LOCK
 105         select ARCH_INLINE_READ_LOCK_BH
 106         select ARCH_INLINE_READ_LOCK_IRQ
 107         select ARCH_INLINE_READ_LOCK_IRQSAVE
 108         select ARCH_INLINE_READ_UNLOCK
 109         select ARCH_INLINE_READ_UNLOCK_BH
 110         select ARCH_INLINE_READ_UNLOCK_IRQ
 111         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
 112         select ARCH_INLINE_WRITE_TRYLOCK
 113         select ARCH_INLINE_WRITE_LOCK
 114         select ARCH_INLINE_WRITE_LOCK_BH
 115         select ARCH_INLINE_WRITE_LOCK_IRQ
 116         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 117         select ARCH_INLINE_WRITE_UNLOCK
 118         select ARCH_INLINE_WRITE_UNLOCK_BH
 119         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 120         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 121         select ARCH_WANT_IPC_PARSE_VERSION
 122         select GENERIC_SMP_IDLE_THREAD
 123         select GENERIC_TIME_VSYSCALL
 124         select GENERIC_CLOCKEVENTS
 125         select KTIME_SCALAR if 32BIT
 126
 127 config SCHED_OMIT_FRAME_POINTER
 128         def_bool y
 129
 130 source "init/Kconfig"
 131
 132 source "kernel/Kconfig.freezer"
 133
 134 menu "Base setup"
 135
 136 comment "Processor type and features"
 137
 138 config 64BIT
 139         def_bool y
 140         prompt "64 bit kernel"
 141         help
 142           Select this option if you have an IBM z/Architecture machine
 143           and want to use the 64 bit addressing mode.
 144
 145 config 32BIT
 146         def_bool y if !64BIT
 147
 148 config SMP
 149         def_bool y
 150         prompt "Symmetric multi-processing support"
 151         ---help---
 152           This enables support for systems with more than one CPU. If you have
 153           a system with only one CPU, like most personal computers, say N. If
 154           you have a system with more than one CPU, say Y.
 155
 156           If you say N here, the kernel will run on single and multiprocessor
 157           machines, but will use only one CPU of a multiprocessor machine. If
 158           you say Y here, the kernel will run on many, but not all,
 159           singleprocessor machines. On a singleprocessor machine, the kernel
 160           will run faster if you say N here.
 161
 162           See also the SMP-HOWTO available at
 163           <http://www.tldp.org/docs.html#howto>.
 164
 165           Even if you don't know what to do here, say Y.
 166
 167 config NR_CPUS
 168         int "Maximum number of CPUs (2-64)"
 169         range 2 64
 170         depends on SMP
 171         default "32" if !64BIT
 172         default "64" if 64BIT
 173         help
 174           This allows you to specify the maximum number of CPUs which this
 175           kernel will support.  The maximum supported value is 64 and the
 176           minimum value which makes sense is 2.
 177
 178           This is purely to save memory - each supported CPU adds
 179           approximately sixteen kilobytes to the kernel image.
 180
 181 config HOTPLUG_CPU
 182         def_bool y
 183         prompt "Support for hot-pluggable CPUs"
 184         depends on SMP
 185         select HOTPLUG
 186         help
 187           Say Y here to be able to turn CPUs off and on. CPUs
 188           can be controlled through /sys/devices/system/cpu/cpu#.
 189           Say N if you want to disable CPU hotplug.
 190
 191 config SCHED_MC
 192         def_bool n
 193
 194 config SCHED_BOOK
 195         def_bool y
 196         prompt "Book scheduler support"
 197         depends on SMP
 198         select SCHED_MC
 199         help
 200           Book scheduler support improves the CPU scheduler's decision making
 201           when dealing with machines that have several books.
 202
 203 config MATHEMU
 204         def_bool y
 205         prompt "IEEE FPU emulation"
 206         depends on MARCH_G5
 207         help
 208           This option is required for IEEE compliant floating point arithmetic
 209           on older ESA/390 machines. Say Y unless you know your machine doesn't
 210           need this.
 211
 212 config COMPAT
 213         def_bool y
 214         prompt "Kernel support for 31 bit emulation"
 215         depends on 64BIT
 216         select COMPAT_BINFMT_ELF if BINFMT_ELF
 217         select ARCH_WANT_OLD_COMPAT_IPC
 218         help
 219           Select this option if you want to enable your system kernel to
 220           handle system-calls from ELF binaries for 31 bit ESA.  This option
 221           (and some other stuff like libraries and such) is needed for
 222           executing 31 bit applications.  It is safe to say "Y".
 223
 224 config SYSVIPC_COMPAT
 225         def_bool y if COMPAT && SYSVIPC
 226
 227 config KEYS_COMPAT
 228         def_bool y if COMPAT && KEYS
 229
 230 config AUDIT_ARCH
 231         def_bool y
 232
 233 config HAVE_MARCH_Z900_FEATURES
 234         def_bool n
 235
 236 config HAVE_MARCH_Z990_FEATURES
 237         def_bool n
 238         select HAVE_MARCH_Z900_FEATURES
 239
 240 config HAVE_MARCH_Z9_109_FEATURES
 241         def_bool n
 242         select HAVE_MARCH_Z990_FEATURES
 243
 244 config HAVE_MARCH_Z10_FEATURES
 245         def_bool n
 246         select HAVE_MARCH_Z9_109_FEATURES
 247
 248 config HAVE_MARCH_Z196_FEATURES
 249         def_bool n
 250         select HAVE_MARCH_Z10_FEATURES
 251
 252 comment "Code generation options"
 253
 254 choice
 255         prompt "Processor type"
 256         default MARCH_G5
 257
 258 config MARCH_G5
 259         bool "System/390 model G5 and G6"
 260         depends on !64BIT
 261         help
 262           Select this to build a 31 bit kernel that works
 263           on all ESA/390 and z/Architecture machines.
 264
 265 config MARCH_Z900
 266         bool "IBM zSeries model z800 and z900"
 267         select HAVE_MARCH_Z900_FEATURES if 64BIT
 268         help
 269           Select this to enable optimizations for model z800/z900 (2064 and
 270           2066 series). This will enable some optimizations that are not
 271           available on older ESA/390 (31 Bit) only CPUs.
 272
 273 config MARCH_Z990
 274         bool "IBM zSeries model z890 and z990"
 275         select HAVE_MARCH_Z990_FEATURES if 64BIT
 276         help
 277           Select this to enable optimizations for model z890/z990 (2084 and
 278           2086 series). The kernel will be slightly faster but will not work
 279           on older machines.
 280
 281 config MARCH_Z9_109
 282         bool "IBM System z9"
 283         select HAVE_MARCH_Z9_109_FEATURES if 64BIT
 284         help
 285           Select this to enable optimizations for IBM System z9 (2094 and
 286           2096 series). The kernel will be slightly faster but will not work
 287           on older machines.
 288
 289 config MARCH_Z10
 290         bool "IBM System z10"
 291         select HAVE_MARCH_Z10_FEATURES if 64BIT
 292         help
 293           Select this to enable optimizations for IBM System z10 (2097 and
 294           2098 series). The kernel will be slightly faster but will not work
 295           on older machines.
 296
 297 config MARCH_Z196
 298         bool "IBM zEnterprise 114 and 196"
 299         select HAVE_MARCH_Z196_FEATURES if 64BIT
 300         help
 301           Select this to enable optimizations for IBM zEnterprise 114 and 196
 302           (2818 and 2817 series). The kernel will be slightly faster but will
 303           not work on older machines.
 304
 305 endchoice
 306
 307 config PACK_STACK
 308         def_bool y
 309         prompt "Pack kernel stack"
 310         help
 311           This option enables the compiler option -mkernel-backchain if it
 312           is available. If the option is available the compiler supports
 313           the new stack layout which dramatically reduces the minimum stack
 314           frame size. With an old compiler a non-leaf function needs a
 315           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 316           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 317           and 24 byte on 64 bit.
 318
 319           Say Y if you are unsure.
 320
 321 config SMALL_STACK
 322         def_bool n
 323         prompt "Use 8kb for kernel stack instead of 16kb"
 324         depends on PACK_STACK && 64BIT && !LOCKDEP
 325         help
 326           If you say Y here and the compiler supports the -mkernel-backchain
 327           option the kernel will use a smaller kernel stack size. The reduced
 328           size is 8kb instead of 16kb. This allows to run more threads on a
 329           system and reduces the pressure on the memory management for higher
 330           order page allocations.
 331
 332           Say N if you are unsure.
 333
 334 config CHECK_STACK
 335         def_bool y
 336         prompt "Detect kernel stack overflow"
 337         help
 338           This option enables the compiler option -mstack-guard and
 339           -mstack-size if they are available. If the compiler supports them
 340           it will emit additional code to each function prolog to trigger
 341           an illegal operation if the kernel stack is about to overflow.
 342
 343           Say N if you are unsure.
 344
 345 config STACK_GUARD
 346         int "Size of the guard area (128-1024)"
 347         range 128 1024
 348         depends on CHECK_STACK
 349         default "256"
 350         help
 351           This allows you to specify the size of the guard area at the lower
 352           end of the kernel stack. If the kernel stack points into the guard
 353           area on function entry an illegal operation is triggered. The size
 354           needs to be a power of 2. Please keep in mind that the size of an
 355           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 356           The minimum size for the stack guard should be 256 for 31 bit and
 357           512 for 64 bit.
 358
 359 config WARN_DYNAMIC_STACK
 360         def_bool n
 361         prompt "Emit compiler warnings for function with dynamic stack usage"
 362         help
 363           This option enables the compiler option -mwarn-dynamicstack. If the
 364           compiler supports this options generates warnings for functions
 365           that dynamically allocate stack space using alloca.
 366
 367           Say N if you are unsure.
 368
 369 comment "Kernel preemption"
 370
 371 source "kernel/Kconfig.preempt"
 372
 373 config ARCH_SPARSEMEM_ENABLE
 374         def_bool y
 375         select SPARSEMEM_VMEMMAP_ENABLE
 376         select SPARSEMEM_VMEMMAP
 377         select SPARSEMEM_STATIC if !64BIT
 378
 379 config ARCH_SPARSEMEM_DEFAULT
 380         def_bool y
 381
 382 config ARCH_SELECT_MEMORY_MODEL
 383         def_bool y
 384
 385 config ARCH_ENABLE_MEMORY_HOTPLUG
 386         def_bool y if SPARSEMEM
 387
 388 config ARCH_ENABLE_MEMORY_HOTREMOVE
 389         def_bool y
 390
 391 config ARCH_HIBERNATION_POSSIBLE
 392         def_bool y if 64BIT
 393
 394 source "mm/Kconfig"
 395
 396 comment "I/O subsystem configuration"
 397
 398 config QDIO
 399         def_tristate y
 400         prompt "QDIO support"
 401         ---help---
 402           This driver provides the Queued Direct I/O base support for
 403           IBM System z.
 404
 405           To compile this driver as a module, choose M here: the
 406           module will be called qdio.
 407
 408           If unsure, say Y.
 409
 410 config CHSC_SCH
 411         def_tristate m
 412         prompt "Support for CHSC subchannels"
 413         help
 414           This driver allows usage of CHSC subchannels. A CHSC subchannel
 415           is usually present on LPAR only.
 416           The driver creates a device /dev/chsc, which may be used to
 417           obtain I/O configuration information about the machine and
 418           to issue asynchronous chsc commands (DANGEROUS).
 419           You will usually only want to use this interface on a special
 420           LPAR designated for system management.
 421
 422           To compile this driver as a module, choose M here: the
 423           module will be called chsc_sch.
 424
 425           If unsure, say N.
 426
 427 comment "Misc"
 428
 429 source "fs/Kconfig.binfmt"
 430
 431 config FORCE_MAX_ZONEORDER
 432         int
 433         default "9"
 434
 435 config PFAULT
 436         def_bool y
 437         prompt "Pseudo page fault support"
 438         help
 439           Select this option, if you want to use PFAULT pseudo page fault
 440           handling under VM. If running native or in LPAR, this option
 441           has no effect. If your VM does not support PFAULT, PAGEEX
 442           pseudo page fault handling will be used.
 443           Note that VM 4.2 supports PFAULT but has a bug in its
 444           implementation that causes some problems.
 445           Everybody who wants to run Linux under VM != VM4.2 should select
 446           this option.
 447
 448 config SHARED_KERNEL
 449         def_bool y
 450         prompt "VM shared kernel support"
 451         help
 452           Select this option, if you want to share the text segment of the
 453           Linux kernel between different VM guests. This reduces memory
 454           usage with lots of guests but greatly increases kernel size.
 455           Also if a kernel was IPL'ed from a shared segment the kexec system
 456           call will not work.
 457           You should only select this option if you know what you are
 458           doing and want to exploit this feature.
 459
 460 config CMM
 461         def_tristate n
 462         prompt "Cooperative memory management"
 463         help
 464           Select this option, if you want to enable the kernel interface
 465           to reduce the memory size of the system. This is accomplished
 466           by allocating pages of memory and put them "on hold". This only
 467           makes sense for a system running under VM where the unused pages
 468           will be reused by VM for other guest systems. The interface
 469           allows an external monitor to balance memory of many systems.
 470           Everybody who wants to run Linux under VM should select this
 471           option.
 472
 473 config CMM_IUCV
 474         def_bool y
 475         prompt "IUCV special message interface to cooperative memory management"
 476         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 477         help
 478           Select this option to enable the special message interface to
 479           the cooperative memory management.
 480
 481 config APPLDATA_BASE
 482         def_bool n
 483         prompt "Linux - VM Monitor Stream, base infrastructure"
 484         depends on PROC_FS
 485         help
 486           This provides a kernel interface for creating and updating z/VM APPLDATA
 487           monitor records. The monitor records are updated at certain time
 488           intervals, once the timer is started.
 489           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 490           i.e. enables or disables monitoring on the Linux side.
 491           A custom interval value (in seconds) can be written to
 492           /proc/appldata/interval.
 493
 494           Defaults are 60 seconds interval and timer off.
 495           The /proc entries can also be read from, showing the current settings.
 496
 497 config APPLDATA_MEM
 498         def_tristate m
 499         prompt "Monitor memory management statistics"
 500         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 501         help
 502           This provides memory management related data to the Linux - VM Monitor
 503           Stream, like paging/swapping rate, memory utilisation, etc.
 504           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 505           APPLDATA monitor record, i.e. enables or disables monitoring this record
 506           on the z/VM side.
 507
 508           Default is disabled.
 509           The /proc entry can also be read from, showing the current settings.
 510
 511           This can also be compiled as a module, which will be called
 512           appldata_mem.o.
 513
 514 config APPLDATA_OS
 515         def_tristate m
 516         prompt "Monitor OS statistics"
 517         depends on APPLDATA_BASE
 518         help
 519           This provides OS related data to the Linux - VM Monitor Stream, like
 520           CPU utilisation, etc.
 521           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 522           APPLDATA monitor record, i.e. enables or disables monitoring this record
 523           on the z/VM side.
 524
 525           Default is disabled.
 526           This can also be compiled as a module, which will be called
 527           appldata_os.o.
 528
 529 config APPLDATA_NET_SUM
 530         def_tristate m
 531         prompt "Monitor overall network statistics"
 532         depends on APPLDATA_BASE && NET
 533         help
 534           This provides network related data to the Linux - VM Monitor Stream,
 535           currently there is only a total sum of network I/O statistics, no
 536           per-interface data.
 537           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 538           APPLDATA monitor record, i.e. enables or disables monitoring this record
 539           on the z/VM side.
 540
 541           Default is disabled.
 542           This can also be compiled as a module, which will be called
 543           appldata_net_sum.o.
 544
 545 source kernel/Kconfig.hz
 546
 547 config S390_HYPFS_FS
 548         def_bool y
 549         prompt "s390 hypervisor file system support"
 550         select SYS_HYPERVISOR
 551         help
 552           This is a virtual file system intended to provide accounting
 553           information in an s390 hypervisor environment.
 554
 555 config KEXEC
 556         def_bool n
 557         prompt "kexec system call"
 558         help
 559           kexec is a system call that implements the ability to shutdown your
 560           current kernel, and to start another kernel.  It is like a reboot
 561           but is independent of hardware/microcode support.
 562
 563 config CRASH_DUMP
 564         bool "kernel crash dumps"
 565         depends on 64BIT && SMP
 566         select KEXEC
 567         help
 568           Generate crash dump after being started by kexec.
 569           Crash dump kernels are loaded in the main kernel with kexec-tools
 570           into a specially reserved region and then later executed after
 571           a crash by kdump/kexec.
 572           For more details see Documentation/kdump/kdump.txt
 573
 574 config ZFCPDUMP
 575         def_bool n
 576         prompt "zfcpdump support"
 577         select SMP
 578         help
 579           Select this option if you want to build an zfcpdump enabled kernel.
 580           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 581
 582 config S390_GUEST
 583         def_bool y
 584         prompt "s390 guest support for KVM (EXPERIMENTAL)"
 585         depends on 64BIT && EXPERIMENTAL
 586         select VIRTUALIZATION
 587         select VIRTIO
 588         select VIRTIO_RING
 589         select VIRTIO_CONSOLE
 590         help
 591           Select this option if you want to run the kernel as a guest under
 592           the KVM hypervisor. This will add detection for KVM as well  as a
 593           virtio transport. If KVM is detected, the virtio console will be
 594           the default console.
 595
 596 config SECCOMP
 597         def_bool y
 598         prompt "Enable seccomp to safely compute untrusted bytecode"
 599         depends on PROC_FS
 600         help
 601           This kernel feature is useful for number crunching applications
 602           that may need to compute untrusted bytecode during their
 603           execution. By using pipes or other transports made available to
 604           the process as file descriptors supporting the read/write
 605           syscalls, it's possible to isolate those applications in
 606           their own address space using seccomp. Once seccomp is
 607           enabled via /proc/<pid>/seccomp, it cannot be disabled
 608           and the task is only allowed to execute a few safe syscalls
 609           defined by each seccomp mode.
 610
 611           If unsure, say Y.
 612
 613 endmenu
 614
 615 menu "Power Management"
 616
 617 source "kernel/power/Kconfig"
 618
 619 endmenu
 620
 621 source "net/Kconfig"
 622
 623 config PCMCIA
 624         def_bool n
 625
 626 config CCW
 627         def_bool y
 628
 629 source "drivers/Kconfig"
 630
 631 source "fs/Kconfig"
 632
 633 source "arch/s390/Kconfig.debug"
 634
 635 source "security/Kconfig"
 636
 637 source "crypto/Kconfig"
 638
 639 source "lib/Kconfig"
 640
 641 source "arch/s390/kvm/Kconfig"