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_DMA_ATTRS
   7         select HAVE_DMA_API_DEBUG
   8         select HAVE_KVM if !TILEGX
   9         select GENERIC_FIND_FIRST_BIT
  10         select USE_GENERIC_SMP_HELPERS
  11         select CC_OPTIMIZE_FOR_SIZE
  12         select HAVE_GENERIC_HARDIRQS
  13         select GENERIC_IRQ_PROBE
  14         select GENERIC_PENDING_IRQ if SMP
  15         select GENERIC_IRQ_SHOW
  16         select HAVE_SYSCALL_WRAPPERS if TILEGX
  17         select SYS_HYPERVISOR
  18         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  19         select GENERIC_CLOCKEVENTS
  20
  21 # FIXME: investigate whether we need/want these options.
  22 #       select HAVE_IOREMAP_PROT
  23 #       select HAVE_OPTPROBES
  24 #       select HAVE_REGS_AND_STACK_ACCESS_API
  25 #       select HAVE_HW_BREAKPOINT
  26 #       select PERF_EVENTS
  27 #       select HAVE_USER_RETURN_NOTIFIER
  28 #       config NO_BOOTMEM
  29 #       config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  30 #       config HUGETLB_PAGE_SIZE_VARIABLE
  31
  32 config MMU
  33         def_bool y
  34
  35 config GENERIC_CSUM
  36         def_bool y
  37
  38 config SEMAPHORE_SLEEPERS
  39         def_bool y
  40
  41 config HAVE_ARCH_ALLOC_REMAP
  42         def_bool y
  43
  44 config HAVE_SETUP_PER_CPU_AREA
  45         def_bool y
  46
  47 config NEED_PER_CPU_PAGE_FIRST_CHUNK
  48         def_bool y
  49
  50 config SYS_SUPPORTS_HUGETLBFS
  51         def_bool y
  52
  53 # Support for additional huge page sizes besides HPAGE_SIZE.
  54 # The software support is currently only present in the TILE-Gx
  55 # hypervisor. TILEPro in any case does not support page sizes
  56 # larger than the default HPAGE_SIZE.
  57 config HUGETLB_SUPER_PAGES
  58         depends on HUGETLB_PAGE && TILEGX
  59         def_bool y
  60
  61 # FIXME: tilegx can implement a more efficient rwsem.
  62 config RWSEM_GENERIC_SPINLOCK
  63         def_bool y
  64
  65 # We have a very flat architecture from a migration point of view,
  66 # so save boot time by presetting this (particularly useful on tile-sim).
  67 config DEFAULT_MIGRATION_COST
  68         int
  69         default "10000000"
  70
  71 # We only support gcc 4.4 and above, so this should work.
  72 config ARCH_SUPPORTS_OPTIMIZED_INLINING
  73         def_bool y
  74
  75 config ARCH_PHYS_ADDR_T_64BIT
  76         def_bool y
  77
  78 config ARCH_DMA_ADDR_T_64BIT
  79         def_bool y
  80
  81 config NEED_DMA_MAP_STATE
  82         def_bool y
  83
  84 config ARCH_HAS_DMA_SET_COHERENT_MASK
  85         bool
  86
  87 config LOCKDEP_SUPPORT
  88         def_bool y
  89
  90 config STACKTRACE_SUPPORT
  91         def_bool y
  92         select STACKTRACE
  93
  94 # We use discontigmem for now; at some point we may want to switch
  95 # to sparsemem (Tilera bug 7996).
  96 config ARCH_DISCONTIGMEM_ENABLE
  97         def_bool y
  98
  99 config ARCH_DISCONTIGMEM_DEFAULT
 100         def_bool y
 101
 102 config TRACE_IRQFLAGS_SUPPORT
 103         def_bool y
 104
 105 config STRICT_DEVMEM
 106         def_bool y
 107
 108 # SMP is required for Tilera Linux.
 109 config SMP
 110         def_bool y
 111
 112 # Allow checking for compile-time determined overflow errors in
 113 # copy_from_user().  There are still unprovable places in the
 114 # generic code as of 2.6.34, so this option is not really compatible
 115 # with -Werror, which is more useful in general.
 116 config DEBUG_COPY_FROM_USER
 117         def_bool n
 118
 119 config HVC_TILE
 120         select HVC_DRIVER
 121         def_bool y
 122
 123 config TILEGX
 124         bool "Building with TILE-Gx (64-bit) compiler and toolchain"
 125
 126 config TILEPRO
 127         def_bool !TILEGX
 128
 129 config 64BIT
 130         def_bool TILEGX
 131
 132 config ARCH_DEFCONFIG
 133         string
 134         default "arch/tile/configs/tilepro_defconfig" if !TILEGX
 135         default "arch/tile/configs/tilegx_defconfig" if TILEGX
 136
 137 source "init/Kconfig"
 138
 139 menu "Tilera-specific configuration"
 140
 141 config NR_CPUS
 142         int "Maximum number of tiles (2-255)"
 143         range 2 255
 144         depends on SMP
 145         default "64"
 146         ---help---
 147           Building with 64 is the recommended value, but a slightly
 148           smaller kernel memory footprint results from using a smaller
 149           value on chips with fewer tiles.
 150
 151 if TILEGX
 152
 153 choice
 154         prompt "Kernel page size"
 155         default PAGE_SIZE_64KB
 156         help
 157           This lets you select the page size of the kernel.  For best
 158           performance on memory-intensive applications, a page size of 64KB
 159           is recommended.  For workloads involving many small files, many
 160           connections, etc., it may be better to select 16KB, which uses
 161           memory more efficiently at some cost in TLB performance.
 162
 163           Note that this option is TILE-Gx specific; currently
 164           TILEPro page size is set by rebuilding the hypervisor.
 165
 166 config PAGE_SIZE_16KB
 167         bool "16KB"
 168
 169 config PAGE_SIZE_64KB
 170         bool "64KB"
 171
 172 endchoice
 173
 174 endif
 175
 176 source "kernel/Kconfig.hz"
 177
 178 config KEXEC
 179         bool "kexec system call"
 180         ---help---
 181           kexec is a system call that implements the ability to shutdown your
 182           current kernel, and to start another kernel.  It is like a reboot
 183           but it is independent of the system firmware.   It is used
 184           to implement the "mboot" Tilera booter.
 185
 186           The name comes from the similarity to the exec system call.
 187
 188 config COMPAT
 189         bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
 190         depends on TILEGX
 191         select COMPAT_BINFMT_ELF
 192         default y
 193         ---help---
 194           If enabled, the kernel will support running TILE-Gx binaries
 195           that were built with the -m32 option.
 196
 197 config SYSVIPC_COMPAT
 198         def_bool y
 199         depends on COMPAT && SYSVIPC
 200
 201 # We do not currently support disabling HIGHMEM on tile64 and tilepro.
 202 config HIGHMEM
 203         bool # "Support for more than 512 MB of RAM"
 204         default !TILEGX
 205         ---help---
 206           Linux can use the full amount of RAM in the system by
 207           default.  However, the address space of TILE processors is
 208           only 4 Gigabytes large. That means that, if you have a large
 209           amount of physical memory, not all of it can be "permanently
 210           mapped" by the kernel. The physical memory that's not
 211           permanently mapped is called "high memory".
 212
 213           If you are compiling a kernel which will never run on a
 214           machine with more than 512 MB total physical RAM, answer
 215           "false" here. This will result in the kernel mapping all of
 216           physical memory into the top 1 GB of virtual memory space.
 217
 218           If unsure, say "true".
 219
 220 config ZONE_DMA
 221         def_bool y
 222
 223 config IOMMU_HELPER
 224         bool
 225
 226 config NEED_SG_DMA_LENGTH
 227         bool
 228
 229 config SWIOTLB
 230         bool
 231         default TILEGX
 232         select IOMMU_HELPER
 233         select NEED_SG_DMA_LENGTH
 234         select ARCH_HAS_DMA_SET_COHERENT_MASK
 235
 236 # We do not currently support disabling NUMA.
 237 config NUMA
 238         bool # "NUMA Memory Allocation and Scheduler Support"
 239         depends on SMP && DISCONTIGMEM
 240         default y
 241         ---help---
 242           NUMA memory allocation is required for TILE processors
 243           unless booting with memory striping enabled in the
 244           hypervisor, or with only a single memory controller.
 245           It is recommended that this option always be enabled.
 246
 247 config NODES_SHIFT
 248         int "Log base 2 of the max number of memory controllers"
 249         default 2
 250         depends on NEED_MULTIPLE_NODES
 251         ---help---
 252           By default, 2, i.e. 2^2 == 4 DDR2 controllers.
 253           In a system with more controllers, this value should be raised.
 254
 255 choice
 256         depends on !TILEGX
 257         prompt "Memory split" if EXPERT
 258         default VMSPLIT_3G
 259         ---help---
 260           Select the desired split between kernel and user memory.
 261
 262           If the address range available to the kernel is less than the
 263           physical memory installed, the remaining memory will be available
 264           as "high memory". Accessing high memory is a little more costly
 265           than low memory, as it needs to be mapped into the kernel first.
 266           Note that increasing the kernel address space limits the range
 267           available to user programs, making the address space there
 268           tighter.  Selecting anything other than the default 3G/1G split
 269           will also likely make your kernel incompatible with binary-only
 270           kernel modules.
 271
 272           If you are not absolutely sure what you are doing, leave this
 273           option alone!
 274
 275         config VMSPLIT_3_75G
 276                 bool "3.75G/0.25G user/kernel split (no kernel networking)"
 277         config VMSPLIT_3_5G
 278                 bool "3.5G/0.5G user/kernel split"
 279         config VMSPLIT_3G
 280                 bool "3G/1G user/kernel split"
 281         config VMSPLIT_2_75G
 282                 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
 283         config VMSPLIT_2_5G
 284                 bool "2.5G/1.5G user/kernel split"
 285         config VMSPLIT_2_25G
 286                 bool "2.25G/1.75G user/kernel split"
 287         config VMSPLIT_2G
 288                 bool "2G/2G user/kernel split"
 289         config VMSPLIT_1G
 290                 bool "1G/3G user/kernel split"
 291 endchoice
 292
 293 config PAGE_OFFSET
 294         hex
 295         depends on !64BIT
 296         default 0xF0000000 if VMSPLIT_3_75G
 297         default 0xE0000000 if VMSPLIT_3_5G
 298         default 0xB0000000 if VMSPLIT_2_75G
 299         default 0xA0000000 if VMSPLIT_2_5G
 300         default 0x90000000 if VMSPLIT_2_25G
 301         default 0x80000000 if VMSPLIT_2G
 302         default 0x40000000 if VMSPLIT_1G
 303         default 0xC0000000
 304
 305 source "mm/Kconfig"
 306
 307 config CMDLINE_BOOL
 308         bool "Built-in kernel command line"
 309         default n
 310         ---help---
 311           Allow for specifying boot arguments to the kernel at
 312           build time.  On some systems (e.g. embedded ones), it is
 313           necessary or convenient to provide some or all of the
 314           kernel boot arguments with the kernel itself (that is,
 315           to not rely on the boot loader to provide them.)
 316
 317           To compile command line arguments into the kernel,
 318           set this option to 'Y', then fill in the
 319           the boot arguments in CONFIG_CMDLINE.
 320
 321           Systems with fully functional boot loaders (e.g. mboot, or
 322           if booting over PCI) should leave this option set to 'N'.
 323
 324 config CMDLINE
 325         string "Built-in kernel command string"
 326         depends on CMDLINE_BOOL
 327         default ""
 328         ---help---
 329           Enter arguments here that should be compiled into the kernel
 330           image and used at boot time.  If the boot loader provides a
 331           command line at boot time, it is appended to this string to
 332           form the full kernel command line, when the system boots.
 333
 334           However, you can use the CONFIG_CMDLINE_OVERRIDE option to
 335           change this behavior.
 336
 337           In most cases, the command line (whether built-in or provided
 338           by the boot loader) should specify the device for the root
 339           file system.
 340
 341 config CMDLINE_OVERRIDE
 342         bool "Built-in command line overrides boot loader arguments"
 343         default n
 344         depends on CMDLINE_BOOL
 345         ---help---
 346           Set this option to 'Y' to have the kernel ignore the boot loader
 347           command line, and use ONLY the built-in command line.
 348
 349           This is used to work around broken boot loaders.  This should
 350           be set to 'N' under normal conditions.
 351
 352 config VMALLOC_RESERVE
 353         hex
 354         default 0x1000000
 355
 356 config HARDWALL
 357         bool "Hardwall support to allow access to user dynamic network"
 358         default y
 359
 360 config KERNEL_PL
 361         int "Processor protection level for kernel"
 362         range 1 2
 363         default "1"
 364         ---help---
 365           This setting determines the processor protection level the
 366           kernel will be built to run at.  Generally you should use
 367           the default value here.
 368
 369 source "arch/tile/gxio/Kconfig"
 370
 371 endmenu  # Tilera-specific configuration
 372
 373 menu "Bus options"
 374
 375 config PCI
 376         bool "PCI support"
 377         default y
 378         select PCI_DOMAINS
 379         select GENERIC_PCI_IOMAP
 380         select TILE_GXIO_TRIO if TILEGX
 381         select ARCH_SUPPORTS_MSI if TILEGX
 382         select PCI_MSI if TILEGX
 383         ---help---
 384           Enable PCI root complex support, so PCIe endpoint devices can
 385           be attached to the Tile chip.  Many, but not all, PCI devices
 386           are supported under Tilera's root complex driver.
 387
 388 config PCI_DOMAINS
 389         bool
 390
 391 config NO_IOMEM
 392         def_bool !PCI
 393
 394 config NO_IOPORT
 395         def_bool !PCI
 396
 397 source "drivers/pci/Kconfig"
 398
 399 config TILE_USB
 400         tristate "Tilera USB host adapter support"
 401         default y
 402         depends on USB
 403         depends on TILEGX
 404         select TILE_GXIO_USB_HOST
 405         ---help---
 406           Provides USB host adapter support for the built-in EHCI and OHCI
 407           interfaces on TILE-Gx chips.
 408
 409 # USB OHCI needs the bounce pool since tilegx will often have more
 410 # than 4GB of memory, but we don't currently use the IOTLB to present
 411 # a 32-bit address to OHCI.  So we need to use a bounce pool instead.
 412 config NEED_BOUNCE_POOL
 413         def_bool USB_OHCI_HCD
 414
 415 config HOTPLUG
 416         bool "Support for hot-pluggable devices"
 417         ---help---
 418           Say Y here if you want to plug devices into your computer while
 419           the system is running, and be able to use them quickly.  In many
 420           cases, the devices can likewise be unplugged at any time too.
 421           One well-known example of this is USB.
 422
 423 source "drivers/pci/hotplug/Kconfig"
 424
 425 endmenu
 426
 427 menu "Executable file formats"
 428
 429 # only elf supported
 430 config KCORE_ELF
 431         def_bool y
 432         depends on PROC_FS
 433
 434 source "fs/Kconfig.binfmt"
 435
 436 endmenu
 437
 438 source "net/Kconfig"
 439
 440 source "drivers/Kconfig"
 441
 442 source "fs/Kconfig"
 443
 444 source "arch/tile/Kconfig.debug"
 445
 446 source "security/Kconfig"
 447
 448 source "crypto/Kconfig"
 449
 450 source "lib/Kconfig"
 451
 452 source "arch/tile/kvm/Kconfig"