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