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