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