arch/s390/Kconfig

   1 config MMU
   2         def_bool y
   3
   4 config ZONE_DMA
   5         def_bool y
   6
   7 config CPU_BIG_ENDIAN
   8         def_bool y
   9
  10 config LOCKDEP_SUPPORT
  11         def_bool y
  12
  13 config STACKTRACE_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 ARCH_DMA_ADDR_T_64BIT
  38         def_bool y
  39
  40 config GENERIC_LOCKBREAK
  41         def_bool y if SMP && PREEMPT
  42
  43 config PGSTE
  44         def_bool y if KVM
  45
  46 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  47         def_bool y
  48
  49 config KEXEC
  50         def_bool y
  51         select KEXEC_CORE
  52
  53 config AUDIT_ARCH
  54         def_bool y
  55
  56 config NO_IOPORT_MAP
  57         def_bool y
  58
  59 config PCI_QUIRKS
  60         def_bool n
  61
  62 config ARCH_SUPPORTS_UPROBES
  63         def_bool y
  64
  65 config S390
  66         def_bool y
  67         select ARCH_BINFMT_ELF_STATE
  68         select ARCH_HAS_DEVMEM_IS_ALLOWED
  69         select ARCH_HAS_ELF_RANDOMIZE
  70         select ARCH_HAS_GCOV_PROFILE_ALL
  71         select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
  72         select ARCH_HAS_KCOV
  73         select ARCH_HAS_SET_MEMORY
  74         select ARCH_HAS_SG_CHAIN
  75         select ARCH_HAS_STRICT_KERNEL_RWX
  76         select ARCH_HAS_STRICT_MODULE_RWX
  77         select ARCH_HAS_UBSAN_SANITIZE_ALL
  78         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  79         select ARCH_INLINE_READ_LOCK
  80         select ARCH_INLINE_READ_LOCK_BH
  81         select ARCH_INLINE_READ_LOCK_IRQ
  82         select ARCH_INLINE_READ_LOCK_IRQSAVE
  83         select ARCH_INLINE_READ_TRYLOCK
  84         select ARCH_INLINE_READ_UNLOCK
  85         select ARCH_INLINE_READ_UNLOCK_BH
  86         select ARCH_INLINE_READ_UNLOCK_IRQ
  87         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
  88         select ARCH_INLINE_SPIN_LOCK
  89         select ARCH_INLINE_SPIN_LOCK_BH
  90         select ARCH_INLINE_SPIN_LOCK_IRQ
  91         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
  92         select ARCH_INLINE_SPIN_TRYLOCK
  93         select ARCH_INLINE_SPIN_TRYLOCK_BH
  94         select ARCH_INLINE_SPIN_UNLOCK
  95         select ARCH_INLINE_SPIN_UNLOCK_BH
  96         select ARCH_INLINE_SPIN_UNLOCK_IRQ
  97         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
  98         select ARCH_INLINE_WRITE_LOCK
  99         select ARCH_INLINE_WRITE_LOCK_BH
 100         select ARCH_INLINE_WRITE_LOCK_IRQ
 101         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 102         select ARCH_INLINE_WRITE_TRYLOCK
 103         select ARCH_INLINE_WRITE_UNLOCK
 104         select ARCH_INLINE_WRITE_UNLOCK_BH
 105         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 106         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 107         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
 108         select ARCH_SUPPORTS_ATOMIC_RMW
 109         select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
 110         select ARCH_SUPPORTS_NUMA_BALANCING
 111         select ARCH_USE_BUILTIN_BSWAP
 112         select ARCH_USE_CMPXCHG_LOCKREF
 113         select ARCH_WANTS_DYNAMIC_TASK_STRUCT
 114         select ARCH_WANTS_PROT_NUMA_PROT_NONE
 115         select ARCH_WANTS_UBSAN_NO_NULL
 116         select ARCH_WANT_IPC_PARSE_VERSION
 117         select BUILDTIME_EXTABLE_SORT
 118         select CLONE_BACKWARDS2
 119         select DYNAMIC_FTRACE if FUNCTION_TRACER
 120         select GENERIC_CLOCKEVENTS
 121         select GENERIC_CPU_AUTOPROBE
 122         select GENERIC_CPU_DEVICES if !SMP
 123         select GENERIC_FIND_FIRST_BIT
 124         select GENERIC_SMP_IDLE_THREAD
 125         select GENERIC_TIME_VSYSCALL
 126         select HAVE_ALIGNED_STRUCT_PAGE if SLUB
 127         select HAVE_ARCH_AUDITSYSCALL
 128         select HAVE_ARCH_JUMP_LABEL
 129         select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
 130         select HAVE_ARCH_SECCOMP_FILTER
 131         select HAVE_ARCH_SOFT_DIRTY
 132         select HAVE_ARCH_TRACEHOOK
 133         select HAVE_ARCH_TRANSPARENT_HUGEPAGE
 134         select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
 135         select HAVE_CMPXCHG_DOUBLE
 136         select HAVE_CMPXCHG_LOCAL
 137         select HAVE_COPY_THREAD_TLS
 138         select HAVE_DEBUG_KMEMLEAK
 139         select HAVE_DMA_API_DEBUG
 140         select HAVE_DMA_CONTIGUOUS
 141         select DMA_NOOP_OPS
 142         select HAVE_DYNAMIC_FTRACE
 143         select HAVE_DYNAMIC_FTRACE_WITH_REGS
 144         select HAVE_EFFICIENT_UNALIGNED_ACCESS
 145         select HAVE_EXIT_THREAD
 146         select HAVE_FTRACE_MCOUNT_RECORD
 147         select HAVE_FUNCTION_GRAPH_TRACER
 148         select HAVE_FUNCTION_TRACER
 149         select HAVE_FUTEX_CMPXCHG if FUTEX
 150         select HAVE_KERNEL_BZIP2
 151         select HAVE_KERNEL_GZIP
 152         select HAVE_KERNEL_LZ4
 153         select HAVE_KERNEL_LZMA
 154         select HAVE_KERNEL_LZO
 155         select HAVE_KERNEL_XZ
 156         select HAVE_KPROBES
 157         select HAVE_KRETPROBES
 158         select HAVE_KVM
 159         select HAVE_LIVEPATCH
 160         select HAVE_MEMBLOCK
 161         select HAVE_MEMBLOCK_NODE_MAP
 162         select HAVE_MEMBLOCK_PHYS_MAP
 163         select HAVE_MOD_ARCH_SPECIFIC
 164         select HAVE_OPROFILE
 165         select HAVE_PERF_EVENTS
 166         select HAVE_REGS_AND_STACK_ACCESS_API
 167         select HAVE_SYSCALL_TRACEPOINTS
 168         select HAVE_VIRT_CPU_ACCOUNTING
 169         select MODULES_USE_ELF_RELA
 170         select NO_BOOTMEM
 171         select OLD_SIGACTION
 172         select OLD_SIGSUSPEND3
 173         select SPARSE_IRQ
 174         select SYSCTL_EXCEPTION_TRACE
 175         select THREAD_INFO_IN_TASK
 176         select TTY
 177         select VIRT_CPU_ACCOUNTING
 178         select ARCH_HAS_SCALED_CPUTIME
 179         select VIRT_TO_BUS
 180         select HAVE_NMI
 181
 182
 183 config SCHED_OMIT_FRAME_POINTER
 184         def_bool y
 185
 186 config PGTABLE_LEVELS
 187         int
 188         default 5
 189
 190 source "init/Kconfig"
 191
 192 source "kernel/Kconfig.freezer"
 193
 194 source "kernel/livepatch/Kconfig"
 195
 196 menu "Processor type and features"
 197
 198 config HAVE_MARCH_Z900_FEATURES
 199         def_bool n
 200
 201 config HAVE_MARCH_Z990_FEATURES
 202         def_bool n
 203         select HAVE_MARCH_Z900_FEATURES
 204
 205 config HAVE_MARCH_Z9_109_FEATURES
 206         def_bool n
 207         select HAVE_MARCH_Z990_FEATURES
 208
 209 config HAVE_MARCH_Z10_FEATURES
 210         def_bool n
 211         select HAVE_MARCH_Z9_109_FEATURES
 212
 213 config HAVE_MARCH_Z196_FEATURES
 214         def_bool n
 215         select HAVE_MARCH_Z10_FEATURES
 216
 217 config HAVE_MARCH_ZEC12_FEATURES
 218         def_bool n
 219         select HAVE_MARCH_Z196_FEATURES
 220
 221 config HAVE_MARCH_Z13_FEATURES
 222         def_bool n
 223         select HAVE_MARCH_ZEC12_FEATURES
 224
 225 config HAVE_MARCH_Z14_FEATURES
 226         def_bool n
 227         select HAVE_MARCH_Z13_FEATURES
 228
 229 choice
 230         prompt "Processor type"
 231         default MARCH_Z196
 232
 233 config MARCH_Z900
 234         bool "IBM zSeries model z800 and z900"
 235         select HAVE_MARCH_Z900_FEATURES
 236         help
 237           Select this to enable optimizations for model z800/z900 (2064 and
 238           2066 series). This will enable some optimizations that are not
 239           available on older ESA/390 (31 Bit) only CPUs.
 240
 241 config MARCH_Z990
 242         bool "IBM zSeries model z890 and z990"
 243         select HAVE_MARCH_Z990_FEATURES
 244         help
 245           Select this to enable optimizations for model z890/z990 (2084 and
 246           2086 series). The kernel will be slightly faster but will not work
 247           on older machines.
 248
 249 config MARCH_Z9_109
 250         bool "IBM System z9"
 251         select HAVE_MARCH_Z9_109_FEATURES
 252         help
 253           Select this to enable optimizations for IBM System z9 (2094 and
 254           2096 series). The kernel will be slightly faster but will not work
 255           on older machines.
 256
 257 config MARCH_Z10
 258         bool "IBM System z10"
 259         select HAVE_MARCH_Z10_FEATURES
 260         help
 261           Select this to enable optimizations for IBM System z10 (2097 and
 262           2098 series). The kernel will be slightly faster but will not work
 263           on older machines.
 264
 265 config MARCH_Z196
 266         bool "IBM zEnterprise 114 and 196"
 267         select HAVE_MARCH_Z196_FEATURES
 268         help
 269           Select this to enable optimizations for IBM zEnterprise 114 and 196
 270           (2818 and 2817 series). The kernel will be slightly faster but will
 271           not work on older machines.
 272
 273 config MARCH_ZEC12
 274         bool "IBM zBC12 and zEC12"
 275         select HAVE_MARCH_ZEC12_FEATURES
 276         help
 277           Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
 278           2827 series). The kernel will be slightly faster but will not work on
 279           older machines.
 280
 281 config MARCH_Z13
 282         bool "IBM z13s and z13"
 283         select HAVE_MARCH_Z13_FEATURES
 284         help
 285           Select this to enable optimizations for IBM z13s and z13 (2965 and
 286           2964 series). The kernel will be slightly faster but will not work on
 287           older machines.
 288
 289 config MARCH_Z14
 290         bool "IBM z14"
 291         select HAVE_MARCH_Z14_FEATURES
 292         help
 293           Select this to enable optimizations for IBM z14 (3906 series).
 294           The kernel will be slightly faster but will not work on older
 295           machines.
 296
 297 endchoice
 298
 299 config MARCH_Z900_TUNE
 300         def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
 301
 302 config MARCH_Z990_TUNE
 303         def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
 304
 305 config MARCH_Z9_109_TUNE
 306         def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
 307
 308 config MARCH_Z10_TUNE
 309         def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
 310
 311 config MARCH_Z196_TUNE
 312         def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
 313
 314 config MARCH_ZEC12_TUNE
 315         def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
 316
 317 config MARCH_Z13_TUNE
 318         def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
 319
 320 config MARCH_Z14_TUNE
 321         def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
 322
 323 choice
 324         prompt "Tune code generation"
 325         default TUNE_DEFAULT
 326         help
 327           Cause the compiler to tune (-mtune) the generated code for a machine.
 328           This will make the code run faster on the selected machine but
 329           somewhat slower on other machines.
 330           This option only changes how the compiler emits instructions, not the
 331           selection of instructions itself, so the resulting kernel will run on
 332           all other machines.
 333
 334 config TUNE_DEFAULT
 335         bool "Default"
 336         help
 337           Tune the generated code for the target processor for which the kernel
 338           will be compiled.
 339
 340 config TUNE_Z900
 341         bool "IBM zSeries model z800 and z900"
 342
 343 config TUNE_Z990
 344         bool "IBM zSeries model z890 and z990"
 345
 346 config TUNE_Z9_109
 347         bool "IBM System z9"
 348
 349 config TUNE_Z10
 350         bool "IBM System z10"
 351
 352 config TUNE_Z196
 353         bool "IBM zEnterprise 114 and 196"
 354
 355 config TUNE_ZEC12
 356         bool "IBM zBC12 and zEC12"
 357
 358 config TUNE_Z13
 359         bool "IBM z13"
 360
 361 config TUNE_Z14
 362         bool "IBM z14"
 363
 364 endchoice
 365
 366 config 64BIT
 367         def_bool y
 368
 369 config COMPAT
 370         def_bool y
 371         prompt "Kernel support for 31 bit emulation"
 372         select COMPAT_BINFMT_ELF if BINFMT_ELF
 373         select ARCH_WANT_OLD_COMPAT_IPC
 374         select COMPAT_OLD_SIGACTION
 375         depends on MULTIUSER
 376         help
 377           Select this option if you want to enable your system kernel to
 378           handle system-calls from ELF binaries for 31 bit ESA.  This option
 379           (and some other stuff like libraries and such) is needed for
 380           executing 31 bit applications.  It is safe to say "Y".
 381
 382 config SYSVIPC_COMPAT
 383         def_bool y if COMPAT && SYSVIPC
 384
 385 config SMP
 386         def_bool y
 387         prompt "Symmetric multi-processing support"
 388         ---help---
 389           This enables support for systems with more than one CPU. If you have
 390           a system with only one CPU, like most personal computers, say N. If
 391           you have a system with more than one CPU, say Y.
 392
 393           If you say N here, the kernel will run on uni- and multiprocessor
 394           machines, but will use only one CPU of a multiprocessor machine. If
 395           you say Y here, the kernel will run on many, but not all,
 396           uniprocessor machines. On a uniprocessor machine, the kernel
 397           will run faster if you say N here.
 398
 399           See also the SMP-HOWTO available at
 400           <http://www.tldp.org/docs.html#howto>.
 401
 402           Even if you don't know what to do here, say Y.
 403
 404 config NR_CPUS
 405         int "Maximum number of CPUs (2-512)"
 406         range 2 512
 407         depends on SMP
 408         default "64"
 409         help
 410           This allows you to specify the maximum number of CPUs which this
 411           kernel will support. The maximum supported value is 512 and the
 412           minimum value which makes sense is 2.
 413
 414           This is purely to save memory - each supported CPU adds
 415           approximately sixteen kilobytes to the kernel image.
 416
 417 config HOTPLUG_CPU
 418         def_bool y
 419         prompt "Support for hot-pluggable CPUs"
 420         depends on SMP
 421         help
 422           Say Y here to be able to turn CPUs off and on. CPUs
 423           can be controlled through /sys/devices/system/cpu/cpu#.
 424           Say N if you want to disable CPU hotplug.
 425
 426 # Some NUMA nodes have memory ranges that span
 427 # other nodes.  Even though a pfn is valid and
 428 # between a node's start and end pfns, it may not
 429 # reside on that node.  See memmap_init_zone()
 430 # for details. <- They meant memory holes!
 431 config NODES_SPAN_OTHER_NODES
 432         def_bool NUMA
 433
 434 config NUMA
 435         bool "NUMA support"
 436         depends on SMP && SCHED_TOPOLOGY
 437         default n
 438         help
 439           Enable NUMA support
 440
 441           This option adds NUMA support to the kernel.
 442
 443           An operation mode can be selected by appending
 444           numa=<method> to the kernel command line.
 445
 446           The default behaviour is identical to appending numa=plain to
 447           the command line. This will create just one node with all
 448           available memory and all CPUs in it.
 449
 450 config NODES_SHIFT
 451         int "Maximum NUMA nodes (as a power of 2)"
 452         range 1 10
 453         depends on NUMA
 454         default "4"
 455         help
 456           Specify the maximum number of NUMA nodes available on the target
 457           system. Increases memory reserved to accommodate various tables.
 458
 459 menu "Select NUMA modes"
 460         depends on NUMA
 461
 462 config NUMA_EMU
 463         bool "NUMA emulation"
 464         default y
 465         help
 466           Numa emulation mode will split the available system memory into
 467           equal chunks which then are distributed over the configured number
 468           of nodes in a round-robin manner.
 469
 470           The number of fake nodes is limited by the number of available memory
 471           chunks (i.e. memory size / fake size) and the number of supported
 472           nodes in the kernel.
 473
 474           The CPUs are assigned to the nodes in a way that partially respects
 475           the original machine topology (if supported by the machine).
 476           Fair distribution of the CPUs is not guaranteed.
 477
 478 config EMU_SIZE
 479         hex "NUMA emulation memory chunk size"
 480         default 0x10000000
 481         range 0x400000 0x100000000
 482         depends on NUMA_EMU
 483         help
 484           Select the default size by which the memory is chopped and then
 485           assigned to emulated NUMA nodes.
 486
 487           This can be overridden by specifying
 488
 489           emu_size=<n>
 490
 491           on the kernel command line where also suffixes K, M, G, and T are
 492           supported.
 493
 494 endmenu
 495
 496 config SCHED_SMT
 497         def_bool n
 498
 499 config SCHED_MC
 500         def_bool n
 501
 502 config SCHED_BOOK
 503         def_bool n
 504
 505 config SCHED_DRAWER
 506         def_bool n
 507
 508 config SCHED_TOPOLOGY
 509         def_bool y
 510         prompt "Topology scheduler support"
 511         depends on SMP
 512         select SCHED_SMT
 513         select SCHED_MC
 514         select SCHED_BOOK
 515         select SCHED_DRAWER
 516         help
 517           Topology scheduler support improves the CPU scheduler's decision
 518           making when dealing with machines that have multi-threading,
 519           multiple cores or multiple books.
 520
 521 source kernel/Kconfig.preempt
 522
 523 source kernel/Kconfig.hz
 524
 525 config ARCH_RANDOM
 526         def_bool y
 527         prompt "s390 architectural random number generation API"
 528         help
 529           Enable the s390 architectural random number generation API
 530           to provide random data for all consumers within the Linux
 531           kernel.
 532
 533           When enabled the arch_random_* functions declared in linux/random.h
 534           are implemented. The implementation is based on the s390 CPACF
 535           instruction subfunction TRNG which provides a real true random
 536           number generator.
 537
 538           If unsure, say Y.
 539
 540 endmenu
 541
 542 menu "Memory setup"
 543
 544 config ARCH_SPARSEMEM_ENABLE
 545         def_bool y
 546         select SPARSEMEM_VMEMMAP_ENABLE
 547         select SPARSEMEM_VMEMMAP
 548
 549 config ARCH_SPARSEMEM_DEFAULT
 550         def_bool y
 551
 552 config ARCH_SELECT_MEMORY_MODEL
 553         def_bool y
 554
 555 config ARCH_ENABLE_MEMORY_HOTPLUG
 556         def_bool y if SPARSEMEM
 557
 558 config ARCH_ENABLE_MEMORY_HOTREMOVE
 559         def_bool y
 560
 561 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
 562         def_bool y
 563
 564 config FORCE_MAX_ZONEORDER
 565         int
 566         default "9"
 567
 568 source "mm/Kconfig"
 569
 570 config MAX_PHYSMEM_BITS
 571         int "Maximum size of supported physical memory in bits (42-53)"
 572         range 42 53
 573         default "46"
 574         help
 575           This option specifies the maximum supported size of physical memory
 576           in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
 577           Increasing the number of bits also increases the kernel image size.
 578           By default 46 bits (64TB) are supported.
 579
 580 config PACK_STACK
 581         def_bool y
 582         prompt "Pack kernel stack"
 583         help
 584           This option enables the compiler option -mkernel-backchain if it
 585           is available. If the option is available the compiler supports
 586           the new stack layout which dramatically reduces the minimum stack
 587           frame size. With an old compiler a non-leaf function needs a
 588           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 589           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 590           and 24 byte on 64 bit.
 591
 592           Say Y if you are unsure.
 593
 594 config CHECK_STACK
 595         def_bool y
 596         prompt "Detect kernel stack overflow"
 597         help
 598           This option enables the compiler option -mstack-guard and
 599           -mstack-size if they are available. If the compiler supports them
 600           it will emit additional code to each function prolog to trigger
 601           an illegal operation if the kernel stack is about to overflow.
 602
 603           Say N if you are unsure.
 604
 605 config STACK_GUARD
 606         int "Size of the guard area (128-1024)"
 607         range 128 1024
 608         depends on CHECK_STACK
 609         default "256"
 610         help
 611           This allows you to specify the size of the guard area at the lower
 612           end of the kernel stack. If the kernel stack points into the guard
 613           area on function entry an illegal operation is triggered. The size
 614           needs to be a power of 2. Please keep in mind that the size of an
 615           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 616           The minimum size for the stack guard should be 256 for 31 bit and
 617           512 for 64 bit.
 618
 619 config WARN_DYNAMIC_STACK
 620         def_bool n
 621         prompt "Emit compiler warnings for function with dynamic stack usage"
 622         help
 623           This option enables the compiler option -mwarn-dynamicstack. If the
 624           compiler supports this options generates warnings for functions
 625           that dynamically allocate stack space using alloca.
 626
 627           Say N if you are unsure.
 628
 629 endmenu
 630
 631 menu "I/O subsystem"
 632
 633 config QDIO
 634         def_tristate y
 635         prompt "QDIO support"
 636         ---help---
 637           This driver provides the Queued Direct I/O base support for
 638           IBM System z.
 639
 640           To compile this driver as a module, choose M here: the
 641           module will be called qdio.
 642
 643           If unsure, say Y.
 644
 645 menuconfig PCI
 646         bool "PCI support"
 647         select PCI_MSI
 648         select IOMMU_SUPPORT
 649         help
 650           Enable PCI support.
 651
 652 if PCI
 653
 654 config PCI_NR_FUNCTIONS
 655         int "Maximum number of PCI functions (1-4096)"
 656         range 1 4096
 657         default "128"
 658         help
 659           This allows you to specify the maximum number of PCI functions which
 660           this kernel will support.
 661
 662 source "drivers/pci/Kconfig"
 663
 664 endif   # PCI
 665
 666 config PCI_DOMAINS
 667         def_bool PCI
 668
 669 config HAS_IOMEM
 670         def_bool PCI
 671
 672 config IOMMU_HELPER
 673         def_bool PCI
 674
 675 config NEED_SG_DMA_LENGTH
 676         def_bool PCI
 677
 678 config NEED_DMA_MAP_STATE
 679         def_bool PCI
 680
 681 config CHSC_SCH
 682         def_tristate m
 683         prompt "Support for CHSC subchannels"
 684         help
 685           This driver allows usage of CHSC subchannels. A CHSC subchannel
 686           is usually present on LPAR only.
 687           The driver creates a device /dev/chsc, which may be used to
 688           obtain I/O configuration information about the machine and
 689           to issue asynchronous chsc commands (DANGEROUS).
 690           You will usually only want to use this interface on a special
 691           LPAR designated for system management.
 692
 693           To compile this driver as a module, choose M here: the
 694           module will be called chsc_sch.
 695
 696           If unsure, say N.
 697
 698 config SCM_BUS
 699         def_bool y
 700         prompt "SCM bus driver"
 701         help
 702           Bus driver for Storage Class Memory.
 703
 704 config EADM_SCH
 705         def_tristate m
 706         prompt "Support for EADM subchannels"
 707         depends on SCM_BUS
 708         help
 709           This driver allows usage of EADM subchannels. EADM subchannels act
 710           as a communication vehicle for SCM increments.
 711
 712           To compile this driver as a module, choose M here: the
 713           module will be called eadm_sch.
 714
 715 config VFIO_CCW
 716         def_tristate n
 717         prompt "Support for VFIO-CCW subchannels"
 718         depends on S390_CCW_IOMMU && VFIO_MDEV
 719         help
 720           This driver allows usage of I/O subchannels via VFIO-CCW.
 721
 722           To compile this driver as a module, choose M here: the
 723           module will be called vfio_ccw.
 724
 725 endmenu
 726
 727 menu "Dump support"
 728
 729 config CRASH_DUMP
 730         bool "kernel crash dumps"
 731         depends on SMP
 732         select KEXEC
 733         help
 734           Generate crash dump after being started by kexec.
 735           Crash dump kernels are loaded in the main kernel with kexec-tools
 736           into a specially reserved region and then later executed after
 737           a crash by kdump/kexec.
 738           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 739           This option also enables s390 zfcpdump.
 740           See also <file:Documentation/s390/zfcpdump.txt>
 741
 742 endmenu
 743
 744 menu "Executable file formats / Emulations"
 745
 746 source "fs/Kconfig.binfmt"
 747
 748 config SECCOMP
 749         def_bool y
 750         prompt "Enable seccomp to safely compute untrusted bytecode"
 751         depends on PROC_FS
 752         help
 753           This kernel feature is useful for number crunching applications
 754           that may need to compute untrusted bytecode during their
 755           execution. By using pipes or other transports made available to
 756           the process as file descriptors supporting the read/write
 757           syscalls, it's possible to isolate those applications in
 758           their own address space using seccomp. Once seccomp is
 759           enabled via /proc/<pid>/seccomp, it cannot be disabled
 760           and the task is only allowed to execute a few safe syscalls
 761           defined by each seccomp mode.
 762
 763           If unsure, say Y.
 764
 765 endmenu
 766
 767 menu "Power Management"
 768
 769 config ARCH_HIBERNATION_POSSIBLE
 770         def_bool y
 771
 772 source "kernel/power/Kconfig"
 773
 774 endmenu
 775
 776 source "net/Kconfig"
 777
 778 config PCMCIA
 779         def_bool n
 780
 781 config CCW
 782         def_bool y
 783
 784 source "drivers/Kconfig"
 785
 786 source "fs/Kconfig"
 787
 788 source "arch/s390/Kconfig.debug"
 789
 790 source "security/Kconfig"
 791
 792 source "crypto/Kconfig"
 793
 794 source "lib/Kconfig"
 795
 796 menu "Virtualization"
 797
 798 config PFAULT
 799         def_bool y
 800         prompt "Pseudo page fault support"
 801         help
 802           Select this option, if you want to use PFAULT pseudo page fault
 803           handling under VM. If running native or in LPAR, this option
 804           has no effect. If your VM does not support PFAULT, PAGEEX
 805           pseudo page fault handling will be used.
 806           Note that VM 4.2 supports PFAULT but has a bug in its
 807           implementation that causes some problems.
 808           Everybody who wants to run Linux under VM != VM4.2 should select
 809           this option.
 810
 811 config SHARED_KERNEL
 812         bool "VM shared kernel support"
 813         depends on !JUMP_LABEL
 814         help
 815           Select this option, if you want to share the text segment of the
 816           Linux kernel between different VM guests. This reduces memory
 817           usage with lots of guests but greatly increases kernel size.
 818           Also if a kernel was IPL'ed from a shared segment the kexec system
 819           call will not work.
 820           You should only select this option if you know what you are
 821           doing and want to exploit this feature.
 822
 823 config CMM
 824         def_tristate n
 825         prompt "Cooperative memory management"
 826         help
 827           Select this option, if you want to enable the kernel interface
 828           to reduce the memory size of the system. This is accomplished
 829           by allocating pages of memory and put them "on hold". This only
 830           makes sense for a system running under VM where the unused pages
 831           will be reused by VM for other guest systems. The interface
 832           allows an external monitor to balance memory of many systems.
 833           Everybody who wants to run Linux under VM should select this
 834           option.
 835
 836 config CMM_IUCV
 837         def_bool y
 838         prompt "IUCV special message interface to cooperative memory management"
 839         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 840         help
 841           Select this option to enable the special message interface to
 842           the cooperative memory management.
 843
 844 config APPLDATA_BASE
 845         def_bool n
 846         prompt "Linux - VM Monitor Stream, base infrastructure"
 847         depends on PROC_FS
 848         help
 849           This provides a kernel interface for creating and updating z/VM APPLDATA
 850           monitor records. The monitor records are updated at certain time
 851           intervals, once the timer is started.
 852           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 853           i.e. enables or disables monitoring on the Linux side.
 854           A custom interval value (in seconds) can be written to
 855           /proc/appldata/interval.
 856
 857           Defaults are 60 seconds interval and timer off.
 858           The /proc entries can also be read from, showing the current settings.
 859
 860 config APPLDATA_MEM
 861         def_tristate m
 862         prompt "Monitor memory management statistics"
 863         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 864         help
 865           This provides memory management related data to the Linux - VM Monitor
 866           Stream, like paging/swapping rate, memory utilisation, etc.
 867           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 868           APPLDATA monitor record, i.e. enables or disables monitoring this record
 869           on the z/VM side.
 870
 871           Default is disabled.
 872           The /proc entry can also be read from, showing the current settings.
 873
 874           This can also be compiled as a module, which will be called
 875           appldata_mem.o.
 876
 877 config APPLDATA_OS
 878         def_tristate m
 879         prompt "Monitor OS statistics"
 880         depends on APPLDATA_BASE
 881         help
 882           This provides OS related data to the Linux - VM Monitor Stream, like
 883           CPU utilisation, etc.
 884           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 885           APPLDATA monitor record, i.e. enables or disables monitoring this record
 886           on the z/VM side.
 887
 888           Default is disabled.
 889           This can also be compiled as a module, which will be called
 890           appldata_os.o.
 891
 892 config APPLDATA_NET_SUM
 893         def_tristate m
 894         prompt "Monitor overall network statistics"
 895         depends on APPLDATA_BASE && NET
 896         help
 897           This provides network related data to the Linux - VM Monitor Stream,
 898           currently there is only a total sum of network I/O statistics, no
 899           per-interface data.
 900           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 901           APPLDATA monitor record, i.e. enables or disables monitoring this record
 902           on the z/VM side.
 903
 904           Default is disabled.
 905           This can also be compiled as a module, which will be called
 906           appldata_net_sum.o.
 907
 908 config S390_HYPFS_FS
 909         def_bool y
 910         prompt "s390 hypervisor file system support"
 911         select SYS_HYPERVISOR
 912         help
 913           This is a virtual file system intended to provide accounting
 914           information in an s390 hypervisor environment.
 915
 916 source "arch/s390/kvm/Kconfig"
 917
 918 config S390_GUEST
 919         def_bool y
 920         prompt "s390 support for virtio devices"
 921         select TTY
 922         select VIRTUALIZATION
 923         select VIRTIO
 924         select VIRTIO_CONSOLE
 925         help
 926           Enabling this option adds support for virtio based paravirtual device
 927           drivers on s390.
 928
 929           Select this option if you want to run the kernel as a guest under
 930           the KVM hypervisor.
 931
 932 config S390_GUEST_OLD_TRANSPORT
 933         def_bool y
 934         prompt "Guest support for old s390 virtio transport (DEPRECATED)"
 935         depends on S390_GUEST
 936         help
 937           Enable this option to add support for the old s390-virtio
 938           transport (i.e. virtio devices NOT based on virtio-ccw). This
 939           type of virtio devices is only available on the experimental
 940           kuli userspace or with old (< 2.6) qemu. If you are running
 941           with a modern version of qemu (which supports virtio-ccw since
 942           1.4 and uses it by default since version 2.4), you probably won't
 943           need this.
 944
 945 endmenu