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