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_VIRT_TO_BUS
  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         depends on TTY
 125         select HVC_DRIVER
 126         def_bool y
 127
 128 config TILEGX
 129         bool "Building with TILE-Gx (64-bit) compiler and toolchain"
 130
 131 config TILEPRO
 132         def_bool !TILEGX
 133
 134 config 64BIT
 135         def_bool TILEGX
 136
 137 config ARCH_DEFCONFIG
 138         string
 139         default "arch/tile/configs/tilepro_defconfig" if !TILEGX
 140         default "arch/tile/configs/tilegx_defconfig" if TILEGX
 141
 142 source "init/Kconfig"
 143
 144 source "kernel/Kconfig.freezer"
 145
 146 menu "Tilera-specific configuration"
 147
 148 config NR_CPUS
 149         int "Maximum number of tiles (2-255)"
 150         range 2 255
 151         depends on SMP
 152         default "64"
 153         ---help---
 154           Building with 64 is the recommended value, but a slightly
 155           smaller kernel memory footprint results from using a smaller
 156           value on chips with fewer tiles.
 157
 158 if TILEGX
 159
 160 choice
 161         prompt "Kernel page size"
 162         default PAGE_SIZE_64KB
 163         help
 164           This lets you select the page size of the kernel.  For best
 165           performance on memory-intensive applications, a page size of 64KB
 166           is recommended.  For workloads involving many small files, many
 167           connections, etc., it may be better to select 16KB, which uses
 168           memory more efficiently at some cost in TLB performance.
 169
 170           Note that this option is TILE-Gx specific; currently
 171           TILEPro page size is set by rebuilding the hypervisor.
 172
 173 config PAGE_SIZE_16KB
 174         bool "16KB"
 175
 176 config PAGE_SIZE_64KB
 177         bool "64KB"
 178
 179 endchoice
 180
 181 endif
 182
 183 source "kernel/Kconfig.hz"
 184
 185 config KEXEC
 186         bool "kexec system call"
 187         ---help---
 188           kexec is a system call that implements the ability to shutdown your
 189           current kernel, and to start another kernel.  It is like a reboot
 190           but it is independent of the system firmware.   It is used
 191           to implement the "mboot" Tilera booter.
 192
 193           The name comes from the similarity to the exec system call.
 194
 195 config COMPAT
 196         bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
 197         depends on TILEGX
 198         select COMPAT_BINFMT_ELF
 199         default y
 200         ---help---
 201           If enabled, the kernel will support running TILE-Gx binaries
 202           that were built with the -m32 option.
 203
 204 config SYSVIPC_COMPAT
 205         def_bool y
 206         depends on COMPAT && SYSVIPC
 207
 208 # We do not currently support disabling HIGHMEM on tile64 and tilepro.
 209 config HIGHMEM
 210         bool # "Support for more than 512 MB of RAM"
 211         default !TILEGX
 212         ---help---
 213           Linux can use the full amount of RAM in the system by
 214           default.  However, the address space of TILE processors is
 215           only 4 Gigabytes large. That means that, if you have a large
 216           amount of physical memory, not all of it can be "permanently
 217           mapped" by the kernel. The physical memory that's not
 218           permanently mapped is called "high memory".
 219
 220           If you are compiling a kernel which will never run on a
 221           machine with more than 512 MB total physical RAM, answer
 222           "false" here. This will result in the kernel mapping all of
 223           physical memory into the top 1 GB of virtual memory space.
 224
 225           If unsure, say "true".
 226
 227 config ZONE_DMA
 228         def_bool y
 229
 230 config IOMMU_HELPER
 231         bool
 232
 233 config NEED_SG_DMA_LENGTH
 234         bool
 235
 236 config SWIOTLB
 237         bool
 238         default TILEGX
 239         select IOMMU_HELPER
 240         select NEED_SG_DMA_LENGTH
 241         select ARCH_HAS_DMA_SET_COHERENT_MASK
 242
 243 # We do not currently support disabling NUMA.
 244 config NUMA
 245         bool # "NUMA Memory Allocation and Scheduler Support"
 246         depends on SMP && DISCONTIGMEM
 247         default y
 248         ---help---
 249           NUMA memory allocation is required for TILE processors
 250           unless booting with memory striping enabled in the
 251           hypervisor, or with only a single memory controller.
 252           It is recommended that this option always be enabled.
 253
 254 config NODES_SHIFT
 255         int "Log base 2 of the max number of memory controllers"
 256         default 2
 257         depends on NEED_MULTIPLE_NODES
 258         ---help---
 259           By default, 2, i.e. 2^2 == 4 DDR2 controllers.
 260           In a system with more controllers, this value should be raised.
 261
 262 choice
 263         depends on !TILEGX
 264         prompt "Memory split" if EXPERT
 265         default VMSPLIT_3G
 266         ---help---
 267           Select the desired split between kernel and user memory.
 268
 269           If the address range available to the kernel is less than the
 270           physical memory installed, the remaining memory will be available
 271           as "high memory". Accessing high memory is a little more costly
 272           than low memory, as it needs to be mapped into the kernel first.
 273           Note that increasing the kernel address space limits the range
 274           available to user programs, making the address space there
 275           tighter.  Selecting anything other than the default 3G/1G split
 276           will also likely make your kernel incompatible with binary-only
 277           kernel modules.
 278
 279           If you are not absolutely sure what you are doing, leave this
 280           option alone!
 281
 282         config VMSPLIT_3_75G
 283                 bool "3.75G/0.25G user/kernel split (no kernel networking)"
 284         config VMSPLIT_3_5G
 285                 bool "3.5G/0.5G user/kernel split"
 286         config VMSPLIT_3G
 287                 bool "3G/1G user/kernel split"
 288         config VMSPLIT_2_75G
 289                 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
 290         config VMSPLIT_2_5G
 291                 bool "2.5G/1.5G user/kernel split"
 292         config VMSPLIT_2_25G
 293                 bool "2.25G/1.75G user/kernel split"
 294         config VMSPLIT_2G
 295                 bool "2G/2G user/kernel split"
 296         config VMSPLIT_1G
 297                 bool "1G/3G user/kernel split"
 298 endchoice
 299
 300 config PAGE_OFFSET
 301         hex
 302         depends on !64BIT
 303         default 0xF0000000 if VMSPLIT_3_75G
 304         default 0xE0000000 if VMSPLIT_3_5G
 305         default 0xB0000000 if VMSPLIT_2_75G
 306         default 0xA0000000 if VMSPLIT_2_5G
 307         default 0x90000000 if VMSPLIT_2_25G
 308         default 0x80000000 if VMSPLIT_2G
 309         default 0x40000000 if VMSPLIT_1G
 310         default 0xC0000000
 311
 312 source "mm/Kconfig"
 313
 314 config CMDLINE_BOOL
 315         bool "Built-in kernel command line"
 316         default n
 317         ---help---
 318           Allow for specifying boot arguments to the kernel at
 319           build time.  On some systems (e.g. embedded ones), it is
 320           necessary or convenient to provide some or all of the
 321           kernel boot arguments with the kernel itself (that is,
 322           to not rely on the boot loader to provide them.)
 323
 324           To compile command line arguments into the kernel,
 325           set this option to 'Y', then fill in the
 326           the boot arguments in CONFIG_CMDLINE.
 327
 328           Systems with fully functional boot loaders (e.g. mboot, or
 329           if booting over PCI) should leave this option set to 'N'.
 330
 331 config CMDLINE
 332         string "Built-in kernel command string"
 333         depends on CMDLINE_BOOL
 334         default ""
 335         ---help---
 336           Enter arguments here that should be compiled into the kernel
 337           image and used at boot time.  If the boot loader provides a
 338           command line at boot time, it is appended to this string to
 339           form the full kernel command line, when the system boots.
 340
 341           However, you can use the CONFIG_CMDLINE_OVERRIDE option to
 342           change this behavior.
 343
 344           In most cases, the command line (whether built-in or provided
 345           by the boot loader) should specify the device for the root
 346           file system.
 347
 348 config CMDLINE_OVERRIDE
 349         bool "Built-in command line overrides boot loader arguments"
 350         default n
 351         depends on CMDLINE_BOOL
 352         ---help---
 353           Set this option to 'Y' to have the kernel ignore the boot loader
 354           command line, and use ONLY the built-in command line.
 355
 356           This is used to work around broken boot loaders.  This should
 357           be set to 'N' under normal conditions.
 358
 359 config VMALLOC_RESERVE
 360         hex
 361         default 0x1000000
 362
 363 config HARDWALL
 364         bool "Hardwall support to allow access to user dynamic network"
 365         default y
 366
 367 config KERNEL_PL
 368         int "Processor protection level for kernel"
 369         range 1 2
 370         default "1"
 371         ---help---
 372           This setting determines the processor protection level the
 373           kernel will be built to run at.  Generally you should use
 374           the default value here.
 375
 376 source "arch/tile/gxio/Kconfig"
 377
 378 endmenu  # Tilera-specific configuration
 379
 380 menu "Bus options"
 381
 382 config PCI
 383         bool "PCI support"
 384         default y
 385         select PCI_DOMAINS
 386         select GENERIC_PCI_IOMAP
 387         select TILE_GXIO_TRIO if TILEGX
 388         select ARCH_SUPPORTS_MSI if TILEGX
 389         select PCI_MSI if TILEGX
 390         ---help---
 391           Enable PCI root complex support, so PCIe endpoint devices can
 392           be attached to the Tile chip.  Many, but not all, PCI devices
 393           are supported under Tilera's root complex driver.
 394
 395 config PCI_DOMAINS
 396         bool
 397
 398 config NO_IOMEM
 399         def_bool !PCI
 400
 401 config NO_IOPORT
 402         def_bool !PCI
 403
 404 source "drivers/pci/Kconfig"
 405
 406 config TILE_USB
 407         tristate "Tilera USB host adapter support"
 408         default y
 409         depends on USB
 410         depends on TILEGX
 411         select TILE_GXIO_USB_HOST
 412         ---help---
 413           Provides USB host adapter support for the built-in EHCI and OHCI
 414           interfaces on TILE-Gx chips.
 415
 416 source "drivers/pci/hotplug/Kconfig"
 417
 418 endmenu
 419
 420 menu "Executable file formats"
 421
 422 # only elf supported
 423 config KCORE_ELF
 424         def_bool y
 425         depends on PROC_FS
 426
 427 source "fs/Kconfig.binfmt"
 428
 429 endmenu
 430
 431 source "net/Kconfig"
 432
 433 source "drivers/Kconfig"
 434
 435 source "fs/Kconfig"
 436
 437 source "arch/tile/Kconfig.debug"
 438
 439 source "security/Kconfig"
 440
 441 source "crypto/Kconfig"
 442
 443 source "lib/Kconfig"
 444
 445 source "arch/tile/kvm/Kconfig"