arch/s390/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0
   2 config MMU
   3         def_bool y
   4
   5 config ZONE_DMA
   6         def_bool y
   7
   8 config CPU_BIG_ENDIAN
   9         def_bool y
  10
  11 config LOCKDEP_SUPPORT
  12         def_bool y
  13
  14 config STACKTRACE_SUPPORT
  15         def_bool y
  16
  17 config RWSEM_GENERIC_SPINLOCK
  18         bool
  19
  20 config RWSEM_XCHGADD_ALGORITHM
  21         def_bool y
  22
  23 config ARCH_HAS_ILOG2_U32
  24         def_bool n
  25
  26 config ARCH_HAS_ILOG2_U64
  27         def_bool n
  28
  29 config GENERIC_HWEIGHT
  30         def_bool y
  31
  32 config GENERIC_BUG
  33         def_bool y if BUG
  34
  35 config GENERIC_BUG_RELATIVE_POINTERS
  36         def_bool y
  37
  38 config ARCH_DMA_ADDR_T_64BIT
  39         def_bool y
  40
  41 config GENERIC_LOCKBREAK
  42         def_bool y if SMP && PREEMPT
  43
  44 config PGSTE
  45         def_bool y if KVM
  46
  47 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  48         def_bool y
  49
  50 config KEXEC
  51         def_bool y
  52         select KEXEC_CORE
  53
  54 config AUDIT_ARCH
  55         def_bool y
  56
  57 config NO_IOPORT_MAP
  58         def_bool y
  59
  60 config PCI_QUIRKS
  61         def_bool n
  62
  63 config ARCH_SUPPORTS_UPROBES
  64         def_bool y
  65
  66 config S390
  67         def_bool y
  68         select ARCH_BINFMT_ELF_STATE
  69         select ARCH_HAS_DEVMEM_IS_ALLOWED
  70         select ARCH_HAS_ELF_RANDOMIZE
  71         select ARCH_HAS_GCOV_PROFILE_ALL
  72         select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
  73         select ARCH_HAS_KCOV
  74         select ARCH_HAS_SET_MEMORY
  75         select ARCH_HAS_SG_CHAIN
  76         select ARCH_HAS_STRICT_KERNEL_RWX
  77         select ARCH_HAS_STRICT_MODULE_RWX
  78         select ARCH_HAS_UBSAN_SANITIZE_ALL
  79         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  80         select ARCH_INLINE_READ_LOCK
  81         select ARCH_INLINE_READ_LOCK_BH
  82         select ARCH_INLINE_READ_LOCK_IRQ
  83         select ARCH_INLINE_READ_LOCK_IRQSAVE
  84         select ARCH_INLINE_READ_TRYLOCK
  85         select ARCH_INLINE_READ_UNLOCK
  86         select ARCH_INLINE_READ_UNLOCK_BH
  87         select ARCH_INLINE_READ_UNLOCK_IRQ
  88         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
  89         select ARCH_INLINE_SPIN_LOCK
  90         select ARCH_INLINE_SPIN_LOCK_BH
  91         select ARCH_INLINE_SPIN_LOCK_IRQ
  92         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
  93         select ARCH_INLINE_SPIN_TRYLOCK
  94         select ARCH_INLINE_SPIN_TRYLOCK_BH
  95         select ARCH_INLINE_SPIN_UNLOCK
  96         select ARCH_INLINE_SPIN_UNLOCK_BH
  97         select ARCH_INLINE_SPIN_UNLOCK_IRQ
  98         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
  99         select ARCH_INLINE_WRITE_LOCK
 100         select ARCH_INLINE_WRITE_LOCK_BH
 101         select ARCH_INLINE_WRITE_LOCK_IRQ
 102         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 103         select ARCH_INLINE_WRITE_TRYLOCK
 104         select ARCH_INLINE_WRITE_UNLOCK
 105         select ARCH_INLINE_WRITE_UNLOCK_BH
 106         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 107         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 108         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
 109         select ARCH_SUPPORTS_ATOMIC_RMW
 110         select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
 111         select ARCH_SUPPORTS_NUMA_BALANCING
 112         select ARCH_USE_BUILTIN_BSWAP
 113         select ARCH_USE_CMPXCHG_LOCKREF
 114         select ARCH_WANTS_DYNAMIC_TASK_STRUCT
 115         select ARCH_WANTS_PROT_NUMA_PROT_NONE
 116         select ARCH_WANTS_UBSAN_NO_NULL
 117         select ARCH_WANT_IPC_PARSE_VERSION
 118         select BUILDTIME_EXTABLE_SORT
 119         select CLONE_BACKWARDS2
 120         select DYNAMIC_FTRACE if FUNCTION_TRACER
 121         select GENERIC_CLOCKEVENTS
 122         select GENERIC_CPU_AUTOPROBE
 123         select GENERIC_CPU_DEVICES if !SMP
 124         select GENERIC_FIND_FIRST_BIT
 125         select GENERIC_SMP_IDLE_THREAD
 126         select GENERIC_TIME_VSYSCALL
 127         select HAVE_ALIGNED_STRUCT_PAGE if SLUB
 128         select HAVE_ARCH_AUDITSYSCALL
 129         select HAVE_ARCH_JUMP_LABEL
 130         select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
 131         select HAVE_ARCH_SECCOMP_FILTER
 132         select HAVE_ARCH_SOFT_DIRTY
 133         select HAVE_ARCH_TRACEHOOK
 134         select HAVE_ARCH_TRANSPARENT_HUGEPAGE
 135         select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
 136         select HAVE_CMPXCHG_DOUBLE
 137         select HAVE_CMPXCHG_LOCAL
 138         select HAVE_COPY_THREAD_TLS
 139         select HAVE_DEBUG_KMEMLEAK
 140         select HAVE_DMA_API_DEBUG
 141         select HAVE_DMA_CONTIGUOUS
 142         select DMA_NOOP_OPS
 143         select HAVE_DYNAMIC_FTRACE
 144         select HAVE_DYNAMIC_FTRACE_WITH_REGS
 145         select HAVE_EFFICIENT_UNALIGNED_ACCESS
 146         select HAVE_EXIT_THREAD
 147         select HAVE_FTRACE_MCOUNT_RECORD
 148         select HAVE_FUNCTION_GRAPH_TRACER
 149         select HAVE_FUNCTION_TRACER
 150         select HAVE_FUTEX_CMPXCHG if FUTEX
 151         select HAVE_KERNEL_BZIP2
 152         select HAVE_KERNEL_GZIP
 153         select HAVE_KERNEL_LZ4
 154         select HAVE_KERNEL_LZMA
 155         select HAVE_KERNEL_LZO
 156         select HAVE_KERNEL_XZ
 157         select HAVE_KPROBES
 158         select HAVE_KRETPROBES
 159         select HAVE_KVM
 160         select HAVE_LIVEPATCH
 161         select HAVE_MEMBLOCK
 162         select HAVE_MEMBLOCK_NODE_MAP
 163         select HAVE_MEMBLOCK_PHYS_MAP
 164         select HAVE_MOD_ARCH_SPECIFIC
 165         select HAVE_OPROFILE
 166         select HAVE_PERF_EVENTS
 167         select HAVE_REGS_AND_STACK_ACCESS_API
 168         select HAVE_SYSCALL_TRACEPOINTS
 169         select HAVE_VIRT_CPU_ACCOUNTING
 170         select MODULES_USE_ELF_RELA
 171         select NO_BOOTMEM
 172         select OLD_SIGACTION
 173         select OLD_SIGSUSPEND3
 174         select SPARSE_IRQ
 175         select SYSCTL_EXCEPTION_TRACE
 176         select THREAD_INFO_IN_TASK
 177         select TTY
 178         select VIRT_CPU_ACCOUNTING
 179         select ARCH_HAS_SCALED_CPUTIME
 180         select VIRT_TO_BUS
 181         select HAVE_NMI
 182
 183
 184 config SCHED_OMIT_FRAME_POINTER
 185         def_bool y
 186
 187 config PGTABLE_LEVELS
 188         int
 189         default 5
 190
 191 source "init/Kconfig"
 192
 193 source "kernel/Kconfig.freezer"
 194
 195 source "kernel/livepatch/Kconfig"
 196
 197 menu "Processor type and features"
 198
 199 config HAVE_MARCH_Z900_FEATURES
 200         def_bool n
 201
 202 config HAVE_MARCH_Z990_FEATURES
 203         def_bool n
 204         select HAVE_MARCH_Z900_FEATURES
 205
 206 config HAVE_MARCH_Z9_109_FEATURES
 207         def_bool n
 208         select HAVE_MARCH_Z990_FEATURES
 209
 210 config HAVE_MARCH_Z10_FEATURES
 211         def_bool n
 212         select HAVE_MARCH_Z9_109_FEATURES
 213
 214 config HAVE_MARCH_Z196_FEATURES
 215         def_bool n
 216         select HAVE_MARCH_Z10_FEATURES
 217
 218 config HAVE_MARCH_ZEC12_FEATURES
 219         def_bool n
 220         select HAVE_MARCH_Z196_FEATURES
 221
 222 config HAVE_MARCH_Z13_FEATURES
 223         def_bool n
 224         select HAVE_MARCH_ZEC12_FEATURES
 225
 226 config HAVE_MARCH_Z14_FEATURES
 227         def_bool n
 228         select HAVE_MARCH_Z13_FEATURES
 229
 230 choice
 231         prompt "Processor type"
 232         default MARCH_Z196
 233
 234 config MARCH_Z900
 235         bool "IBM zSeries model z800 and z900"
 236         select HAVE_MARCH_Z900_FEATURES
 237         help
 238           Select this to enable optimizations for model z800/z900 (2064 and
 239           2066 series). This will enable some optimizations that are not
 240           available on older ESA/390 (31 Bit) only CPUs.
 241
 242 config MARCH_Z990
 243         bool "IBM zSeries model z890 and z990"
 244         select HAVE_MARCH_Z990_FEATURES
 245         help
 246           Select this to enable optimizations for model z890/z990 (2084 and
 247           2086 series). The kernel will be slightly faster but will not work
 248           on older machines.
 249
 250 config MARCH_Z9_109
 251         bool "IBM System z9"
 252         select HAVE_MARCH_Z9_109_FEATURES
 253         help
 254           Select this to enable optimizations for IBM System z9 (2094 and
 255           2096 series). The kernel will be slightly faster but will not work
 256           on older machines.
 257
 258 config MARCH_Z10
 259         bool "IBM System z10"
 260         select HAVE_MARCH_Z10_FEATURES
 261         help
 262           Select this to enable optimizations for IBM System z10 (2097 and
 263           2098 series). The kernel will be slightly faster but will not work
 264           on older machines.
 265
 266 config MARCH_Z196
 267         bool "IBM zEnterprise 114 and 196"
 268         select HAVE_MARCH_Z196_FEATURES
 269         help
 270           Select this to enable optimizations for IBM zEnterprise 114 and 196
 271           (2818 and 2817 series). The kernel will be slightly faster but will
 272           not work on older machines.
 273
 274 config MARCH_ZEC12
 275         bool "IBM zBC12 and zEC12"
 276         select HAVE_MARCH_ZEC12_FEATURES
 277         help
 278           Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
 279           2827 series). The kernel will be slightly faster but will not work on
 280           older machines.
 281
 282 config MARCH_Z13
 283         bool "IBM z13s and z13"
 284         select HAVE_MARCH_Z13_FEATURES
 285         help
 286           Select this to enable optimizations for IBM z13s and z13 (2965 and
 287           2964 series). The kernel will be slightly faster but will not work on
 288           older machines.
 289
 290 config MARCH_Z14
 291         bool "IBM z14"
 292         select HAVE_MARCH_Z14_FEATURES
 293         help
 294           Select this to enable optimizations for IBM z14 (3906 series).
 295           The kernel will be slightly faster but will not work on older
 296           machines.
 297
 298 endchoice
 299
 300 config MARCH_Z900_TUNE
 301         def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
 302
 303 config MARCH_Z990_TUNE
 304         def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
 305
 306 config MARCH_Z9_109_TUNE
 307         def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
 308
 309 config MARCH_Z10_TUNE
 310         def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
 311
 312 config MARCH_Z196_TUNE
 313         def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
 314
 315 config MARCH_ZEC12_TUNE
 316         def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
 317
 318 config MARCH_Z13_TUNE
 319         def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
 320
 321 config MARCH_Z14_TUNE
 322         def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
 323
 324 choice
 325         prompt "Tune code generation"
 326         default TUNE_DEFAULT
 327         help
 328           Cause the compiler to tune (-mtune) the generated code for a machine.
 329           This will make the code run faster on the selected machine but
 330           somewhat slower on other machines.
 331           This option only changes how the compiler emits instructions, not the
 332           selection of instructions itself, so the resulting kernel will run on
 333           all other machines.
 334
 335 config TUNE_DEFAULT
 336         bool "Default"
 337         help
 338           Tune the generated code for the target processor for which the kernel
 339           will be compiled.
 340
 341 config TUNE_Z900
 342         bool "IBM zSeries model z800 and z900"
 343
 344 config TUNE_Z990
 345         bool "IBM zSeries model z890 and z990"
 346
 347 config TUNE_Z9_109
 348         bool "IBM System z9"
 349
 350 config TUNE_Z10
 351         bool "IBM System z10"
 352
 353 config TUNE_Z196
 354         bool "IBM zEnterprise 114 and 196"
 355
 356 config TUNE_ZEC12
 357         bool "IBM zBC12 and zEC12"
 358
 359 config TUNE_Z13
 360         bool "IBM z13"
 361
 362 config TUNE_Z14
 363         bool "IBM z14"
 364
 365 endchoice
 366
 367 config 64BIT
 368         def_bool y
 369
 370 config COMPAT
 371         def_bool y
 372         prompt "Kernel support for 31 bit emulation"
 373         select COMPAT_BINFMT_ELF if BINFMT_ELF
 374         select ARCH_WANT_OLD_COMPAT_IPC
 375         select COMPAT_OLD_SIGACTION
 376         depends on MULTIUSER
 377         help
 378           Select this option if you want to enable your system kernel to
 379           handle system-calls from ELF binaries for 31 bit ESA.  This option
 380           (and some other stuff like libraries and such) is needed for
 381           executing 31 bit applications.  It is safe to say "Y".
 382
 383 config SYSVIPC_COMPAT
 384         def_bool y if COMPAT && SYSVIPC
 385
 386 config SMP
 387         def_bool y
 388         prompt "Symmetric multi-processing support"
 389         ---help---
 390           This enables support for systems with more than one CPU. If you have
 391           a system with only one CPU, like most personal computers, say N. If
 392           you have a system with more than one CPU, say Y.
 393
 394           If you say N here, the kernel will run on uni- and multiprocessor
 395           machines, but will use only one CPU of a multiprocessor machine. If
 396           you say Y here, the kernel will run on many, but not all,
 397           uniprocessor machines. On a uniprocessor machine, the kernel
 398           will run faster if you say N here.
 399
 400           See also the SMP-HOWTO available at
 401           <http://www.tldp.org/docs.html#howto>.
 402
 403           Even if you don't know what to do here, say Y.
 404
 405 config NR_CPUS
 406         int "Maximum number of CPUs (2-512)"
 407         range 2 512
 408         depends on SMP
 409         default "64"
 410         help
 411           This allows you to specify the maximum number of CPUs which this
 412           kernel will support. The maximum supported value is 512 and the
 413           minimum value which makes sense is 2.
 414
 415           This is purely to save memory - each supported CPU adds
 416           approximately sixteen kilobytes to the kernel image.
 417
 418 config HOTPLUG_CPU
 419         def_bool y
 420         prompt "Support for hot-pluggable CPUs"
 421         depends on SMP
 422         help
 423           Say Y here to be able to turn CPUs off and on. CPUs
 424           can be controlled through /sys/devices/system/cpu/cpu#.
 425           Say N if you want to disable CPU hotplug.
 426
 427 # Some NUMA nodes have memory ranges that span
 428 # other nodes.  Even though a pfn is valid and
 429 # between a node's start and end pfns, it may not
 430 # reside on that node.  See memmap_init_zone()
 431 # for details. <- They meant memory holes!
 432 config NODES_SPAN_OTHER_NODES
 433         def_bool NUMA
 434
 435 config NUMA
 436         bool "NUMA support"
 437         depends on SMP && SCHED_TOPOLOGY
 438         default n
 439         help
 440           Enable NUMA support
 441
 442           This option adds NUMA support to the kernel.
 443
 444           An operation mode can be selected by appending
 445           numa=<method> to the kernel command line.
 446
 447           The default behaviour is identical to appending numa=plain to
 448           the command line. This will create just one node with all
 449           available memory and all CPUs in it.
 450
 451 config NODES_SHIFT
 452         int "Maximum NUMA nodes (as a power of 2)"
 453         range 1 10
 454         depends on NUMA
 455         default "4"
 456         help
 457           Specify the maximum number of NUMA nodes available on the target
 458           system. Increases memory reserved to accommodate various tables.
 459
 460 menu "Select NUMA modes"
 461         depends on NUMA
 462
 463 config NUMA_EMU
 464         bool "NUMA emulation"
 465         default y
 466         help
 467           Numa emulation mode will split the available system memory into
 468           equal chunks which then are distributed over the configured number
 469           of nodes in a round-robin manner.
 470
 471           The number of fake nodes is limited by the number of available memory
 472           chunks (i.e. memory size / fake size) and the number of supported
 473           nodes in the kernel.
 474
 475           The CPUs are assigned to the nodes in a way that partially respects
 476           the original machine topology (if supported by the machine).
 477           Fair distribution of the CPUs is not guaranteed.
 478
 479 config EMU_SIZE
 480         hex "NUMA emulation memory chunk size"
 481         default 0x10000000
 482         range 0x400000 0x100000000
 483         depends on NUMA_EMU
 484         help
 485           Select the default size by which the memory is chopped and then
 486           assigned to emulated NUMA nodes.
 487
 488           This can be overridden by specifying
 489
 490           emu_size=<n>
 491
 492           on the kernel command line where also suffixes K, M, G, and T are
 493           supported.
 494
 495 endmenu
 496
 497 config SCHED_SMT
 498         def_bool n
 499
 500 config SCHED_MC
 501         def_bool n
 502
 503 config SCHED_BOOK
 504         def_bool n
 505
 506 config SCHED_DRAWER
 507         def_bool n
 508
 509 config SCHED_TOPOLOGY
 510         def_bool y
 511         prompt "Topology scheduler support"
 512         depends on SMP
 513         select SCHED_SMT
 514         select SCHED_MC
 515         select SCHED_BOOK
 516         select SCHED_DRAWER
 517         help
 518           Topology scheduler support improves the CPU scheduler's decision
 519           making when dealing with machines that have multi-threading,
 520           multiple cores or multiple books.
 521
 522 source kernel/Kconfig.preempt
 523
 524 source kernel/Kconfig.hz
 525
 526 config ARCH_RANDOM
 527         def_bool y
 528         prompt "s390 architectural random number generation API"
 529         help
 530           Enable the s390 architectural random number generation API
 531           to provide random data for all consumers within the Linux
 532           kernel.
 533
 534           When enabled the arch_random_* functions declared in linux/random.h
 535           are implemented. The implementation is based on the s390 CPACF
 536           instruction subfunction TRNG which provides a real true random
 537           number generator.
 538
 539           If unsure, say Y.
 540
 541 endmenu
 542
 543 menu "Memory setup"
 544
 545 config ARCH_SPARSEMEM_ENABLE
 546         def_bool y
 547         select SPARSEMEM_VMEMMAP_ENABLE
 548         select SPARSEMEM_VMEMMAP
 549
 550 config ARCH_SPARSEMEM_DEFAULT
 551         def_bool y
 552
 553 config ARCH_SELECT_MEMORY_MODEL
 554         def_bool y
 555
 556 config ARCH_ENABLE_MEMORY_HOTPLUG
 557         def_bool y if SPARSEMEM
 558
 559 config ARCH_ENABLE_MEMORY_HOTREMOVE
 560         def_bool y
 561
 562 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
 563         def_bool y
 564
 565 config FORCE_MAX_ZONEORDER
 566         int
 567         default "9"
 568
 569 source "mm/Kconfig"
 570
 571 config MAX_PHYSMEM_BITS
 572         int "Maximum size of supported physical memory in bits (42-53)"
 573         range 42 53
 574         default "46"
 575         help
 576           This option specifies the maximum supported size of physical memory
 577           in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
 578           Increasing the number of bits also increases the kernel image size.
 579           By default 46 bits (64TB) are supported.
 580
 581 config PACK_STACK
 582         def_bool y
 583         prompt "Pack kernel stack"
 584         help
 585           This option enables the compiler option -mkernel-backchain if it
 586           is available. If the option is available the compiler supports
 587           the new stack layout which dramatically reduces the minimum stack
 588           frame size. With an old compiler a non-leaf function needs a
 589           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 590           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 591           and 24 byte on 64 bit.
 592
 593           Say Y if you are unsure.
 594
 595 config CHECK_STACK
 596         def_bool y
 597         prompt "Detect kernel stack overflow"
 598         help
 599           This option enables the compiler option -mstack-guard and
 600           -mstack-size if they are available. If the compiler supports them
 601           it will emit additional code to each function prolog to trigger
 602           an illegal operation if the kernel stack is about to overflow.
 603
 604           Say N if you are unsure.
 605
 606 config STACK_GUARD
 607         int "Size of the guard area (128-1024)"
 608         range 128 1024
 609         depends on CHECK_STACK
 610         default "256"
 611         help
 612           This allows you to specify the size of the guard area at the lower
 613           end of the kernel stack. If the kernel stack points into the guard
 614           area on function entry an illegal operation is triggered. The size
 615           needs to be a power of 2. Please keep in mind that the size of an
 616           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 617           The minimum size for the stack guard should be 256 for 31 bit and
 618           512 for 64 bit.
 619
 620 config WARN_DYNAMIC_STACK
 621         def_bool n
 622         prompt "Emit compiler warnings for function with dynamic stack usage"
 623         help
 624           This option enables the compiler option -mwarn-dynamicstack. If the
 625           compiler supports this options generates warnings for functions
 626           that dynamically allocate stack space using alloca.
 627
 628           Say N if you are unsure.
 629
 630 endmenu
 631
 632 menu "I/O subsystem"
 633
 634 config QDIO
 635         def_tristate y
 636         prompt "QDIO support"
 637         ---help---
 638           This driver provides the Queued Direct I/O base support for
 639           IBM System z.
 640
 641           To compile this driver as a module, choose M here: the
 642           module will be called qdio.
 643
 644           If unsure, say Y.
 645
 646 menuconfig PCI
 647         bool "PCI support"
 648         select PCI_MSI
 649         select IOMMU_SUPPORT
 650         help
 651           Enable PCI support.
 652
 653 if PCI
 654
 655 config PCI_NR_FUNCTIONS
 656         int "Maximum number of PCI functions (1-4096)"
 657         range 1 4096
 658         default "128"
 659         help
 660           This allows you to specify the maximum number of PCI functions which
 661           this kernel will support.
 662
 663 source "drivers/pci/Kconfig"
 664
 665 endif   # PCI
 666
 667 config PCI_DOMAINS
 668         def_bool PCI
 669
 670 config HAS_IOMEM
 671         def_bool PCI
 672
 673 config IOMMU_HELPER
 674         def_bool PCI
 675
 676 config NEED_SG_DMA_LENGTH
 677         def_bool PCI
 678
 679 config NEED_DMA_MAP_STATE
 680         def_bool PCI
 681
 682 config CHSC_SCH
 683         def_tristate m
 684         prompt "Support for CHSC subchannels"
 685         help
 686           This driver allows usage of CHSC subchannels. A CHSC subchannel
 687           is usually present on LPAR only.
 688           The driver creates a device /dev/chsc, which may be used to
 689           obtain I/O configuration information about the machine and
 690           to issue asynchronous chsc commands (DANGEROUS).
 691           You will usually only want to use this interface on a special
 692           LPAR designated for system management.
 693
 694           To compile this driver as a module, choose M here: the
 695           module will be called chsc_sch.
 696
 697           If unsure, say N.
 698
 699 config SCM_BUS
 700         def_bool y
 701         prompt "SCM bus driver"
 702         help
 703           Bus driver for Storage Class Memory.
 704
 705 config EADM_SCH
 706         def_tristate m
 707         prompt "Support for EADM subchannels"
 708         depends on SCM_BUS
 709         help
 710           This driver allows usage of EADM subchannels. EADM subchannels act
 711           as a communication vehicle for SCM increments.
 712
 713           To compile this driver as a module, choose M here: the
 714           module will be called eadm_sch.
 715
 716 config VFIO_CCW
 717         def_tristate n
 718         prompt "Support for VFIO-CCW subchannels"
 719         depends on S390_CCW_IOMMU && VFIO_MDEV
 720         help
 721           This driver allows usage of I/O subchannels via VFIO-CCW.
 722
 723           To compile this driver as a module, choose M here: the
 724           module will be called vfio_ccw.
 725
 726 endmenu
 727
 728 menu "Dump support"
 729
 730 config CRASH_DUMP
 731         bool "kernel crash dumps"
 732         depends on SMP
 733         select KEXEC
 734         help
 735           Generate crash dump after being started by kexec.
 736           Crash dump kernels are loaded in the main kernel with kexec-tools
 737           into a specially reserved region and then later executed after
 738           a crash by kdump/kexec.
 739           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 740           This option also enables s390 zfcpdump.
 741           See also <file:Documentation/s390/zfcpdump.txt>
 742
 743 endmenu
 744
 745 menu "Executable file formats / Emulations"
 746
 747 source "fs/Kconfig.binfmt"
 748
 749 config SECCOMP
 750         def_bool y
 751         prompt "Enable seccomp to safely compute untrusted bytecode"
 752         depends on PROC_FS
 753         help
 754           This kernel feature is useful for number crunching applications
 755           that may need to compute untrusted bytecode during their
 756           execution. By using pipes or other transports made available to
 757           the process as file descriptors supporting the read/write
 758           syscalls, it's possible to isolate those applications in
 759           their own address space using seccomp. Once seccomp is
 760           enabled via /proc/<pid>/seccomp, it cannot be disabled
 761           and the task is only allowed to execute a few safe syscalls
 762           defined by each seccomp mode.
 763
 764           If unsure, say Y.
 765
 766 endmenu
 767
 768 menu "Power Management"
 769
 770 config ARCH_HIBERNATION_POSSIBLE
 771         def_bool y
 772
 773 source "kernel/power/Kconfig"
 774
 775 endmenu
 776
 777 source "net/Kconfig"
 778
 779 config PCMCIA
 780         def_bool n
 781
 782 config CCW
 783         def_bool y
 784
 785 source "drivers/Kconfig"
 786
 787 source "fs/Kconfig"
 788
 789 source "arch/s390/Kconfig.debug"
 790
 791 source "security/Kconfig"
 792
 793 source "crypto/Kconfig"
 794
 795 source "lib/Kconfig"
 796
 797 menu "Virtualization"
 798
 799 config PFAULT
 800         def_bool y
 801         prompt "Pseudo page fault support"
 802         help
 803           Select this option, if you want to use PFAULT pseudo page fault
 804           handling under VM. If running native or in LPAR, this option
 805           has no effect. If your VM does not support PFAULT, PAGEEX
 806           pseudo page fault handling will be used.
 807           Note that VM 4.2 supports PFAULT but has a bug in its
 808           implementation that causes some problems.
 809           Everybody who wants to run Linux under VM != VM4.2 should select
 810           this option.
 811
 812 config SHARED_KERNEL
 813         bool "VM shared kernel support"
 814         depends on !JUMP_LABEL
 815         help
 816           Select this option, if you want to share the text segment of the
 817           Linux kernel between different VM guests. This reduces memory
 818           usage with lots of guests but greatly increases kernel size.
 819           Also if a kernel was IPL'ed from a shared segment the kexec system
 820           call will not work.
 821           You should only select this option if you know what you are
 822           doing and want to exploit this feature.
 823
 824 config CMM
 825         def_tristate n
 826         prompt "Cooperative memory management"
 827         help
 828           Select this option, if you want to enable the kernel interface
 829           to reduce the memory size of the system. This is accomplished
 830           by allocating pages of memory and put them "on hold". This only
 831           makes sense for a system running under VM where the unused pages
 832           will be reused by VM for other guest systems. The interface
 833           allows an external monitor to balance memory of many systems.
 834           Everybody who wants to run Linux under VM should select this
 835           option.
 836
 837 config CMM_IUCV
 838         def_bool y
 839         prompt "IUCV special message interface to cooperative memory management"
 840         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 841         help
 842           Select this option to enable the special message interface to
 843           the cooperative memory management.
 844
 845 config APPLDATA_BASE
 846         def_bool n
 847         prompt "Linux - VM Monitor Stream, base infrastructure"
 848         depends on PROC_FS
 849         help
 850           This provides a kernel interface for creating and updating z/VM APPLDATA
 851           monitor records. The monitor records are updated at certain time
 852           intervals, once the timer is started.
 853           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 854           i.e. enables or disables monitoring on the Linux side.
 855           A custom interval value (in seconds) can be written to
 856           /proc/appldata/interval.
 857
 858           Defaults are 60 seconds interval and timer off.
 859           The /proc entries can also be read from, showing the current settings.
 860
 861 config APPLDATA_MEM
 862         def_tristate m
 863         prompt "Monitor memory management statistics"
 864         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 865         help
 866           This provides memory management related data to the Linux - VM Monitor
 867           Stream, like paging/swapping rate, memory utilisation, etc.
 868           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 869           APPLDATA monitor record, i.e. enables or disables monitoring this record
 870           on the z/VM side.
 871
 872           Default is disabled.
 873           The /proc entry can also be read from, showing the current settings.
 874
 875           This can also be compiled as a module, which will be called
 876           appldata_mem.o.
 877
 878 config APPLDATA_OS
 879         def_tristate m
 880         prompt "Monitor OS statistics"
 881         depends on APPLDATA_BASE
 882         help
 883           This provides OS related data to the Linux - VM Monitor Stream, like
 884           CPU utilisation, etc.
 885           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 886           APPLDATA monitor record, i.e. enables or disables monitoring this record
 887           on the z/VM side.
 888
 889           Default is disabled.
 890           This can also be compiled as a module, which will be called
 891           appldata_os.o.
 892
 893 config APPLDATA_NET_SUM
 894         def_tristate m
 895         prompt "Monitor overall network statistics"
 896         depends on APPLDATA_BASE && NET
 897         help
 898           This provides network related data to the Linux - VM Monitor Stream,
 899           currently there is only a total sum of network I/O statistics, no
 900           per-interface data.
 901           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 902           APPLDATA monitor record, i.e. enables or disables monitoring this record
 903           on the z/VM side.
 904
 905           Default is disabled.
 906           This can also be compiled as a module, which will be called
 907           appldata_net_sum.o.
 908
 909 config S390_HYPFS_FS
 910         def_bool y
 911         prompt "s390 hypervisor file system support"
 912         select SYS_HYPERVISOR
 913         help
 914           This is a virtual file system intended to provide accounting
 915           information in an s390 hypervisor environment.
 916
 917 source "arch/s390/kvm/Kconfig"
 918
 919 config S390_GUEST
 920         def_bool y
 921         prompt "s390 support for virtio devices"
 922         select TTY
 923         select VIRTUALIZATION
 924         select VIRTIO
 925         select VIRTIO_CONSOLE
 926         help
 927           Enabling this option adds support for virtio based paravirtual device
 928           drivers on s390.
 929
 930           Select this option if you want to run the kernel as a guest under
 931           the KVM hypervisor.
 932
 933 config S390_GUEST_OLD_TRANSPORT
 934         def_bool y
 935         prompt "Guest support for old s390 virtio transport (DEPRECATED)"
 936         depends on S390_GUEST
 937         help
 938           Enable this option to add support for the old s390-virtio
 939           transport (i.e. virtio devices NOT based on virtio-ccw). This
 940           type of virtio devices is only available on the experimental
 941           kuli userspace or with old (< 2.6) qemu. If you are running
 942           with a modern version of qemu (which supports virtio-ccw since
 943           1.4 and uses it by default since version 2.4), you probably won't
 944           need this.
 945
 946 endmenu