arch/tile/Kconfig

   1 # For a description of the syntax of this configuration file,
   2 # see Documentation/kbuild/kconfig-language.txt.
   3
   4 config TILE
   5         def_bool y
   6         select HAVE_EXIT_THREAD
   7         select HAVE_PERF_EVENTS
   8         select USE_PMC if PERF_EVENTS
   9         select HAVE_DMA_API_DEBUG
  10         select HAVE_KVM if !TILEGX
  11         select GENERIC_FIND_FIRST_BIT
  12         select SYSCTL_EXCEPTION_TRACE
  13         select CC_OPTIMIZE_FOR_SIZE
  14         select HAVE_DEBUG_KMEMLEAK
  15         select GENERIC_IRQ_PROBE
  16         select GENERIC_PENDING_IRQ if SMP
  17         select GENERIC_IRQ_SHOW
  18         select HAVE_DEBUG_BUGVERBOSE
  19         select VIRT_TO_BUS
  20         select SYS_HYPERVISOR
  21         select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
  22         select ARCH_HAS_DEVMEM_IS_ALLOWED
  23         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  24         select GENERIC_CLOCKEVENTS
  25         select MODULES_USE_ELF_RELA
  26         select HAVE_ARCH_TRACEHOOK
  27         select HAVE_SYSCALL_TRACEPOINTS
  28         select USER_STACKTRACE_SUPPORT
  29         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  30         select HAVE_DEBUG_STACKOVERFLOW
  31         select ARCH_WANT_FRAME_POINTERS
  32         select HAVE_CONTEXT_TRACKING
  33         select HAVE_NMI if USE_PMC
  34         select EDAC_SUPPORT
  35         select GENERIC_STRNCPY_FROM_USER
  36         select GENERIC_STRNLEN_USER
  37         select HAVE_ARCH_SECCOMP_FILTER
  38
  39 # FIXME: investigate whether we need/want these options.
  40 #       select HAVE_IOREMAP_PROT
  41 #       select HAVE_OPTPROBES
  42 #       select HAVE_REGS_AND_STACK_ACCESS_API
  43 #       select HAVE_HW_BREAKPOINT
  44 #       select PERF_EVENTS
  45 #       select HAVE_USER_RETURN_NOTIFIER
  46 #       config NO_BOOTMEM
  47 #       config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  48 #       config HUGETLB_PAGE_SIZE_VARIABLE
  49
  50 config MMU
  51         def_bool y
  52
  53 config GENERIC_CSUM
  54         def_bool y
  55
  56 config HAVE_ARCH_ALLOC_REMAP
  57         def_bool y
  58
  59 config HAVE_SETUP_PER_CPU_AREA
  60         def_bool y
  61
  62 config NEED_PER_CPU_PAGE_FIRST_CHUNK
  63         def_bool y
  64
  65 config SYS_SUPPORTS_HUGETLBFS
  66         def_bool y
  67
  68 # Support for additional huge page sizes besides HPAGE_SIZE.
  69 # The software support is currently only present in the TILE-Gx
  70 # hypervisor. TILEPro in any case does not support page sizes
  71 # larger than the default HPAGE_SIZE.
  72 config HUGETLB_SUPER_PAGES
  73         depends on HUGETLB_PAGE && TILEGX
  74         def_bool y
  75
  76 config GENERIC_TIME_VSYSCALL
  77         def_bool y
  78
  79 # Enable PMC if PERF_EVENTS, OPROFILE, or WATCHPOINTS are enabled.
  80 config USE_PMC
  81         bool
  82
  83 # FIXME: tilegx can implement a more efficient rwsem.
  84 config RWSEM_GENERIC_SPINLOCK
  85         def_bool y
  86
  87 # We only support gcc 4.4 and above, so this should work.
  88 config ARCH_SUPPORTS_OPTIMIZED_INLINING
  89         def_bool y
  90
  91 config ARCH_PHYS_ADDR_T_64BIT
  92         def_bool y
  93
  94 config ARCH_DMA_ADDR_T_64BIT
  95         def_bool y
  96
  97 config NEED_DMA_MAP_STATE
  98         def_bool y
  99
 100 config ARCH_HAS_DMA_SET_COHERENT_MASK
 101         bool
 102
 103 config LOCKDEP_SUPPORT
 104         def_bool y
 105
 106 config STACKTRACE_SUPPORT
 107         def_bool y
 108         select STACKTRACE
 109
 110 # We use discontigmem for now; at some point we may want to switch
 111 # to sparsemem (Tilera bug 7996).
 112 config ARCH_DISCONTIGMEM_ENABLE
 113         def_bool y
 114
 115 config ARCH_DISCONTIGMEM_DEFAULT
 116         def_bool y
 117
 118 config TRACE_IRQFLAGS_SUPPORT
 119         def_bool y
 120
 121 # SMP is required for Tilera Linux.
 122 config SMP
 123         def_bool y
 124
 125 config HVC_TILE
 126         depends on TTY
 127         select HVC_DRIVER
 128         select HVC_IRQ if TILEGX
 129         def_bool y
 130
 131 # Building with ARCH=tilegx (or ARCH=tile) implies using the
 132 # 64-bit TILE-Gx toolchain, so force CONFIG_TILEGX on.
 133 config TILEGX
 134         def_bool ARCH != "tilepro"
 135         select SPARSE_IRQ
 136         select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
 137         select HAVE_FUNCTION_TRACER
 138         select HAVE_FUNCTION_GRAPH_TRACER
 139         select HAVE_DYNAMIC_FTRACE
 140         select HAVE_FTRACE_MCOUNT_RECORD
 141         select HAVE_KPROBES
 142         select HAVE_KRETPROBES
 143         select HAVE_ARCH_KGDB
 144         select ARCH_SUPPORTS_ATOMIC_RMW
 145         select HAVE_ARCH_JUMP_LABEL
 146
 147 config TILEPRO
 148         def_bool !TILEGX
 149
 150 config 64BIT
 151         def_bool TILEGX
 152
 153 config ARCH_DEFCONFIG
 154         string
 155         default "arch/tile/configs/tilepro_defconfig" if !TILEGX
 156         default "arch/tile/configs/tilegx_defconfig" if TILEGX
 157
 158 config PGTABLE_LEVELS
 159         int
 160         default 3 if 64BIT
 161         default 2
 162
 163 source "init/Kconfig"
 164
 165 source "kernel/Kconfig.freezer"
 166
 167 menu "Tilera-specific configuration"
 168
 169 config NR_CPUS
 170         int "Maximum number of tiles (2-255)"
 171         range 2 255
 172         depends on SMP
 173         default "64"
 174         ---help---
 175           Building with 64 is the recommended value, but a slightly
 176           smaller kernel memory footprint results from using a smaller
 177           value on chips with fewer tiles.
 178
 179 choice
 180         prompt "Kernel page size"
 181         default PAGE_SIZE_64KB
 182         help
 183           This lets you select the page size of the kernel.  For best
 184           performance on memory-intensive applications, a page size of 64KB
 185           is recommended.  For workloads involving many small files, many
 186           connections, etc., it may be better to select 16KB, which uses
 187           memory more efficiently at some cost in TLB performance.
 188
 189           Note that for TILEPro, you must also rebuild the hypervisor
 190           with a matching page size.
 191
 192 config PAGE_SIZE_4KB
 193         bool "4KB" if TILEPRO
 194
 195 config PAGE_SIZE_16KB
 196         bool "16KB"
 197
 198 config PAGE_SIZE_64KB
 199         bool "64KB"
 200
 201 endchoice
 202
 203 source "kernel/Kconfig.hz"
 204
 205 config KEXEC
 206         bool "kexec system call"
 207         select KEXEC_CORE
 208         ---help---
 209           kexec is a system call that implements the ability to shutdown your
 210           current kernel, and to start another kernel.  It is like a reboot
 211           but it is independent of the system firmware.   It is used
 212           to implement the "mboot" Tilera booter.
 213
 214           The name comes from the similarity to the exec system call.
 215
 216 config COMPAT
 217         bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
 218         depends on TILEGX
 219         select COMPAT_BINFMT_ELF
 220         default y
 221         ---help---
 222           If enabled, the kernel will support running TILE-Gx binaries
 223           that were built with the -m32 option.
 224
 225 config SECCOMP
 226         bool "Enable seccomp to safely compute untrusted bytecode"
 227         depends on PROC_FS
 228         help
 229           This kernel feature is useful for number crunching applications
 230           that may need to compute untrusted bytecode during their
 231           execution. By using pipes or other transports made available to
 232           the process as file descriptors supporting the read/write
 233           syscalls, it's possible to isolate those applications in
 234           their own address space using seccomp. Once seccomp is
 235           enabled via prctl, it cannot be disabled and the task is only
 236           allowed to execute a few safe syscalls defined by each seccomp
 237           mode.
 238
 239           If unsure, say N.
 240
 241 config SYSVIPC_COMPAT
 242         def_bool y
 243         depends on COMPAT && SYSVIPC
 244
 245 # We do not currently support disabling HIGHMEM on tilepro.
 246 config HIGHMEM
 247         bool # "Support for more than 512 MB of RAM"
 248         default !TILEGX
 249         ---help---
 250           Linux can use the full amount of RAM in the system by
 251           default.  However, the address space of TILE processors is
 252           only 4 Gigabytes large. That means that, if you have a large
 253           amount of physical memory, not all of it can be "permanently
 254           mapped" by the kernel. The physical memory that's not
 255           permanently mapped is called "high memory".
 256
 257           If you are compiling a kernel which will never run on a
 258           machine with more than 512 MB total physical RAM, answer
 259           "false" here. This will result in the kernel mapping all of
 260           physical memory into the top 1 GB of virtual memory space.
 261
 262           If unsure, say "true".
 263
 264 config ZONE_DMA
 265         def_bool y
 266
 267 config IOMMU_HELPER
 268         bool
 269
 270 config NEED_SG_DMA_LENGTH
 271         bool
 272
 273 config SWIOTLB
 274         bool
 275         default TILEGX
 276         select IOMMU_HELPER
 277         select NEED_SG_DMA_LENGTH
 278         select ARCH_HAS_DMA_SET_COHERENT_MASK
 279
 280 # We do not currently support disabling NUMA.
 281 config NUMA
 282         bool # "NUMA Memory Allocation and Scheduler Support"
 283         depends on SMP && DISCONTIGMEM
 284         default y
 285         ---help---
 286           NUMA memory allocation is required for TILE processors
 287           unless booting with memory striping enabled in the
 288           hypervisor, or with only a single memory controller.
 289           It is recommended that this option always be enabled.
 290
 291 config NODES_SHIFT
 292         int "Log base 2 of the max number of memory controllers"
 293         default 2
 294         depends on NEED_MULTIPLE_NODES
 295         ---help---
 296           By default, 2, i.e. 2^2 == 4 DDR2 controllers.
 297           In a system with more controllers, this value should be raised.
 298
 299 choice
 300         depends on !TILEGX
 301         prompt "Memory split" if EXPERT
 302         default VMSPLIT_3G
 303         ---help---
 304           Select the desired split between kernel and user memory.
 305
 306           If the address range available to the kernel is less than the
 307           physical memory installed, the remaining memory will be available
 308           as "high memory". Accessing high memory is a little more costly
 309           than low memory, as it needs to be mapped into the kernel first.
 310           Note that increasing the kernel address space limits the range
 311           available to user programs, making the address space there
 312           tighter.  Selecting anything other than the default 3G/1G split
 313           will also likely make your kernel incompatible with binary-only
 314           kernel modules.
 315
 316           If you are not absolutely sure what you are doing, leave this
 317           option alone!
 318
 319         config VMSPLIT_3_75G
 320                 bool "3.75G/0.25G user/kernel split (no kernel networking)"
 321         config VMSPLIT_3_5G
 322                 bool "3.5G/0.5G user/kernel split"
 323         config VMSPLIT_3G
 324                 bool "3G/1G user/kernel split"
 325         config VMSPLIT_2_75G
 326                 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
 327         config VMSPLIT_2_5G
 328                 bool "2.5G/1.5G user/kernel split"
 329         config VMSPLIT_2_25G
 330                 bool "2.25G/1.75G user/kernel split"
 331         config VMSPLIT_2G
 332                 bool "2G/2G user/kernel split"
 333         config VMSPLIT_1G
 334                 bool "1G/3G user/kernel split"
 335 endchoice
 336
 337 config PAGE_OFFSET
 338         hex
 339         depends on !64BIT
 340         default 0xF0000000 if VMSPLIT_3_75G
 341         default 0xE0000000 if VMSPLIT_3_5G
 342         default 0xB0000000 if VMSPLIT_2_75G
 343         default 0xA0000000 if VMSPLIT_2_5G
 344         default 0x90000000 if VMSPLIT_2_25G
 345         default 0x80000000 if VMSPLIT_2G
 346         default 0x40000000 if VMSPLIT_1G
 347         default 0xC0000000
 348
 349 source "mm/Kconfig"
 350
 351 source "kernel/Kconfig.preempt"
 352
 353 config CMDLINE_BOOL
 354         bool "Built-in kernel command line"
 355         default n
 356         ---help---
 357           Allow for specifying boot arguments to the kernel at
 358           build time.  On some systems (e.g. embedded ones), it is
 359           necessary or convenient to provide some or all of the
 360           kernel boot arguments with the kernel itself (that is,
 361           to not rely on the boot loader to provide them.)
 362
 363           To compile command line arguments into the kernel,
 364           set this option to 'Y', then fill in the
 365           the boot arguments in CONFIG_CMDLINE.
 366
 367           Systems with fully functional boot loaders (e.g. mboot, or
 368           if booting over PCI) should leave this option set to 'N'.
 369
 370 config CMDLINE
 371         string "Built-in kernel command string"
 372         depends on CMDLINE_BOOL
 373         default ""
 374         ---help---
 375           Enter arguments here that should be compiled into the kernel
 376           image and used at boot time.  If the boot loader provides a
 377           command line at boot time, it is appended to this string to
 378           form the full kernel command line, when the system boots.
 379
 380           However, you can use the CONFIG_CMDLINE_OVERRIDE option to
 381           change this behavior.
 382
 383           In most cases, the command line (whether built-in or provided
 384           by the boot loader) should specify the device for the root
 385           file system.
 386
 387 config CMDLINE_OVERRIDE
 388         bool "Built-in command line overrides boot loader arguments"
 389         default n
 390         depends on CMDLINE_BOOL
 391         ---help---
 392           Set this option to 'Y' to have the kernel ignore the boot loader
 393           command line, and use ONLY the built-in command line.
 394
 395           This is used to work around broken boot loaders.  This should
 396           be set to 'N' under normal conditions.
 397
 398 config VMALLOC_RESERVE
 399         hex
 400         default 0x2000000
 401
 402 config HARDWALL
 403         bool "Hardwall support to allow access to user dynamic network"
 404         default y
 405
 406 config KERNEL_PL
 407         int "Processor protection level for kernel"
 408         range 1 2
 409         default 2 if TILEGX
 410         default 1 if !TILEGX
 411         ---help---
 412           Since MDE 4.2, the Tilera hypervisor runs the kernel
 413           at PL2 by default.  If running under an older hypervisor,
 414           or as a KVM guest, you must run at PL1.  (The current
 415           hypervisor may also be recompiled with "make HV_PL=2" to
 416           allow it to run a kernel at PL1, but clients running at PL1
 417           are not expected to be supported indefinitely.)
 418
 419           If you're not sure, don't change the default.
 420
 421 source "arch/tile/gxio/Kconfig"
 422
 423 endmenu  # Tilera-specific configuration
 424
 425 menu "Bus options"
 426
 427 config PCI
 428         bool "PCI support"
 429         default y
 430         select PCI_DOMAINS
 431         select GENERIC_PCI_IOMAP
 432         select TILE_GXIO_TRIO if TILEGX
 433         select PCI_MSI if TILEGX
 434         ---help---
 435           Enable PCI root complex support, so PCIe endpoint devices can
 436           be attached to the Tile chip.  Many, but not all, PCI devices
 437           are supported under Tilera's root complex driver.
 438
 439 config PCI_DOMAINS
 440         bool
 441
 442 config NO_IOMEM
 443         def_bool !PCI
 444
 445 config NO_IOPORT_MAP
 446         def_bool !PCI
 447
 448 config TILE_PCI_IO
 449         bool "PCI I/O space support"
 450         default n
 451         depends on PCI
 452         depends on TILEGX
 453         ---help---
 454           Enable PCI I/O space support on TILEGx. Since the PCI I/O space
 455           is used by few modern PCIe endpoint devices, its support is disabled
 456           by default to save the TRIO PIO Region resource for other purposes.
 457
 458 source "drivers/pci/Kconfig"
 459
 460 config TILE_USB
 461         tristate "Tilera USB host adapter support"
 462         default y
 463         depends on USB
 464         depends on TILEGX
 465         select TILE_GXIO_USB_HOST
 466         ---help---
 467           Provides USB host adapter support for the built-in EHCI and OHCI
 468           interfaces on TILE-Gx chips.
 469
 470 endmenu
 471
 472 menu "Executable file formats"
 473
 474 source "fs/Kconfig.binfmt"
 475
 476 endmenu
 477
 478 source "net/Kconfig"
 479
 480 source "drivers/Kconfig"
 481
 482 source "fs/Kconfig"
 483
 484 source "arch/tile/Kconfig.debug"
 485
 486 source "security/Kconfig"
 487
 488 source "crypto/Kconfig"
 489
 490 source "lib/Kconfig"
 491
 492 source "arch/tile/kvm/Kconfig"