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 ARCH_HAS_DEVMEM_IS_ALLOWED
   7         select ARCH_HAVE_NMI_SAFE_CMPXCHG
   8         select ARCH_WANT_FRAME_POINTERS
   9         select CC_OPTIMIZE_FOR_SIZE
  10         select EDAC_SUPPORT
  11         select GENERIC_CLOCKEVENTS
  12         select GENERIC_FIND_FIRST_BIT
  13         select GENERIC_IRQ_PROBE
  14         select GENERIC_IRQ_SHOW
  15         select GENERIC_PENDING_IRQ if SMP
  16         select GENERIC_STRNCPY_FROM_USER
  17         select GENERIC_STRNLEN_USER
  18         select HAVE_ARCH_SECCOMP_FILTER
  19         select HAVE_ARCH_TRACEHOOK
  20         select HAVE_CONTEXT_TRACKING
  21         select HAVE_DEBUG_BUGVERBOSE
  22         select HAVE_DEBUG_KMEMLEAK
  23         select HAVE_DEBUG_STACKOVERFLOW
  24         select HAVE_DMA_API_DEBUG
  25         select HAVE_EXIT_THREAD
  26         select HAVE_KVM if !TILEGX
  27         select HAVE_NMI if USE_PMC
  28         select HAVE_PERF_EVENTS
  29         select HAVE_SYSCALL_TRACEPOINTS
  30         select MODULES_USE_ELF_RELA
  31         select SYSCTL_EXCEPTION_TRACE
  32         select SYS_HYPERVISOR
  33         select USER_STACKTRACE_SUPPORT
  34         select USE_PMC if PERF_EVENTS
  35         select VIRT_TO_BUS
  36
  37 config MMU
  38         def_bool y
  39
  40 config GENERIC_CSUM
  41         def_bool y
  42
  43 config HAVE_ARCH_ALLOC_REMAP
  44         def_bool y
  45
  46 config HAVE_SETUP_PER_CPU_AREA
  47         def_bool y
  48
  49 config NEED_PER_CPU_PAGE_FIRST_CHUNK
  50         def_bool y
  51
  52 config SYS_SUPPORTS_HUGETLBFS
  53         def_bool y
  54
  55 # Support for additional huge page sizes besides HPAGE_SIZE.
  56 # The software support is currently only present in the TILE-Gx
  57 # hypervisor. TILEPro in any case does not support page sizes
  58 # larger than the default HPAGE_SIZE.
  59 config HUGETLB_SUPER_PAGES
  60         depends on HUGETLB_PAGE && TILEGX
  61         def_bool y
  62
  63 config GENERIC_TIME_VSYSCALL
  64         def_bool y
  65
  66 # Enable PMC if PERF_EVENTS, OPROFILE, or WATCHPOINTS are enabled.
  67 config USE_PMC
  68         bool
  69
  70 # FIXME: tilegx can implement a more efficient rwsem.
  71 config RWSEM_GENERIC_SPINLOCK
  72         def_bool y
  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 # SMP is required for Tilera Linux.
 109 config SMP
 110         def_bool y
 111
 112 config HVC_TILE
 113         depends on TTY
 114         select HVC_DRIVER
 115         select HVC_IRQ if TILEGX
 116         def_bool y
 117
 118 # Building with ARCH=tilegx (or ARCH=tile) implies using the
 119 # 64-bit TILE-Gx toolchain, so force CONFIG_TILEGX on.
 120 config TILEGX
 121         def_bool ARCH != "tilepro"
 122         select ARCH_SUPPORTS_ATOMIC_RMW
 123         select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
 124         select HAVE_ARCH_JUMP_LABEL
 125         select HAVE_ARCH_KGDB
 126         select HAVE_DYNAMIC_FTRACE
 127         select HAVE_FTRACE_MCOUNT_RECORD
 128         select HAVE_FUNCTION_GRAPH_TRACER
 129         select HAVE_FUNCTION_TRACER
 130         select HAVE_KPROBES
 131         select HAVE_KRETPROBES
 132         select SPARSE_IRQ
 133
 134 config TILEPRO
 135         def_bool !TILEGX
 136
 137 config 64BIT
 138         def_bool TILEGX
 139
 140 config ARCH_DEFCONFIG
 141         string
 142         default "arch/tile/configs/tilepro_defconfig" if !TILEGX
 143         default "arch/tile/configs/tilegx_defconfig" if TILEGX
 144
 145 config PGTABLE_LEVELS
 146         int
 147         default 3 if 64BIT
 148         default 2
 149
 150 source "init/Kconfig"
 151
 152 source "kernel/Kconfig.freezer"
 153
 154 menu "Tilera-specific configuration"
 155
 156 config NR_CPUS
 157         int "Maximum number of tiles (2-255)"
 158         range 2 255
 159         depends on SMP
 160         default "64"
 161         ---help---
 162           Building with 64 is the recommended value, but a slightly
 163           smaller kernel memory footprint results from using a smaller
 164           value on chips with fewer tiles.
 165
 166 choice
 167         prompt "Kernel page size"
 168         default PAGE_SIZE_64KB
 169         help
 170           This lets you select the page size of the kernel.  For best
 171           performance on memory-intensive applications, a page size of 64KB
 172           is recommended.  For workloads involving many small files, many
 173           connections, etc., it may be better to select 16KB, which uses
 174           memory more efficiently at some cost in TLB performance.
 175
 176           Note that for TILEPro, you must also rebuild the hypervisor
 177           with a matching page size.
 178
 179 config PAGE_SIZE_4KB
 180         bool "4KB" if TILEPRO
 181
 182 config PAGE_SIZE_16KB
 183         bool "16KB"
 184
 185 config PAGE_SIZE_64KB
 186         bool "64KB"
 187
 188 endchoice
 189
 190 source "kernel/Kconfig.hz"
 191
 192 config KEXEC
 193         bool "kexec system call"
 194         select KEXEC_CORE
 195         ---help---
 196           kexec is a system call that implements the ability to shutdown your
 197           current kernel, and to start another kernel.  It is like a reboot
 198           but it is independent of the system firmware.   It is used
 199           to implement the "mboot" Tilera booter.
 200
 201           The name comes from the similarity to the exec system call.
 202
 203 config COMPAT
 204         bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
 205         depends on TILEGX
 206         select COMPAT_BINFMT_ELF
 207         default y
 208         ---help---
 209           If enabled, the kernel will support running TILE-Gx binaries
 210           that were built with the -m32 option.
 211
 212 config SECCOMP
 213         bool "Enable seccomp to safely compute untrusted bytecode"
 214         depends on PROC_FS
 215         help
 216           This kernel feature is useful for number crunching applications
 217           that may need to compute untrusted bytecode during their
 218           execution. By using pipes or other transports made available to
 219           the process as file descriptors supporting the read/write
 220           syscalls, it's possible to isolate those applications in
 221           their own address space using seccomp. Once seccomp is
 222           enabled via prctl, it cannot be disabled and the task is only
 223           allowed to execute a few safe syscalls defined by each seccomp
 224           mode.
 225
 226           If unsure, say N.
 227
 228 config SYSVIPC_COMPAT
 229         def_bool y
 230         depends on COMPAT && SYSVIPC
 231
 232 # We do not currently support disabling HIGHMEM on tilepro.
 233 config HIGHMEM
 234         bool # "Support for more than 512 MB of RAM"
 235         default !TILEGX
 236         ---help---
 237           Linux can use the full amount of RAM in the system by
 238           default.  However, the address space of TILE processors is
 239           only 4 Gigabytes large. That means that, if you have a large
 240           amount of physical memory, not all of it can be "permanently
 241           mapped" by the kernel. The physical memory that's not
 242           permanently mapped is called "high memory".
 243
 244           If you are compiling a kernel which will never run on a
 245           machine with more than 512 MB total physical RAM, answer
 246           "false" here. This will result in the kernel mapping all of
 247           physical memory into the top 1 GB of virtual memory space.
 248
 249           If unsure, say "true".
 250
 251 config ZONE_DMA
 252         def_bool y
 253
 254 config IOMMU_HELPER
 255         bool
 256
 257 config NEED_SG_DMA_LENGTH
 258         bool
 259
 260 config SWIOTLB
 261         bool
 262         default TILEGX
 263         select IOMMU_HELPER
 264         select NEED_SG_DMA_LENGTH
 265         select ARCH_HAS_DMA_SET_COHERENT_MASK
 266
 267 # We do not currently support disabling NUMA.
 268 config NUMA
 269         bool # "NUMA Memory Allocation and Scheduler Support"
 270         depends on SMP && DISCONTIGMEM
 271         default y
 272         ---help---
 273           NUMA memory allocation is required for TILE processors
 274           unless booting with memory striping enabled in the
 275           hypervisor, or with only a single memory controller.
 276           It is recommended that this option always be enabled.
 277
 278 config NODES_SHIFT
 279         int "Log base 2 of the max number of memory controllers"
 280         default 2
 281         depends on NEED_MULTIPLE_NODES
 282         ---help---
 283           By default, 2, i.e. 2^2 == 4 DDR2 controllers.
 284           In a system with more controllers, this value should be raised.
 285
 286 choice
 287         depends on !TILEGX
 288         prompt "Memory split" if EXPERT
 289         default VMSPLIT_3G
 290         ---help---
 291           Select the desired split between kernel and user memory.
 292
 293           If the address range available to the kernel is less than the
 294           physical memory installed, the remaining memory will be available
 295           as "high memory". Accessing high memory is a little more costly
 296           than low memory, as it needs to be mapped into the kernel first.
 297           Note that increasing the kernel address space limits the range
 298           available to user programs, making the address space there
 299           tighter.  Selecting anything other than the default 3G/1G split
 300           will also likely make your kernel incompatible with binary-only
 301           kernel modules.
 302
 303           If you are not absolutely sure what you are doing, leave this
 304           option alone!
 305
 306         config VMSPLIT_3_75G
 307                 bool "3.75G/0.25G user/kernel split (no kernel networking)"
 308         config VMSPLIT_3_5G
 309                 bool "3.5G/0.5G user/kernel split"
 310         config VMSPLIT_3G
 311                 bool "3G/1G user/kernel split"
 312         config VMSPLIT_2_75G
 313                 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
 314         config VMSPLIT_2_5G
 315                 bool "2.5G/1.5G user/kernel split"
 316         config VMSPLIT_2_25G
 317                 bool "2.25G/1.75G user/kernel split"
 318         config VMSPLIT_2G
 319                 bool "2G/2G user/kernel split"
 320         config VMSPLIT_1G
 321                 bool "1G/3G user/kernel split"
 322 endchoice
 323
 324 config PAGE_OFFSET
 325         hex
 326         depends on !64BIT
 327         default 0xF0000000 if VMSPLIT_3_75G
 328         default 0xE0000000 if VMSPLIT_3_5G
 329         default 0xB0000000 if VMSPLIT_2_75G
 330         default 0xA0000000 if VMSPLIT_2_5G
 331         default 0x90000000 if VMSPLIT_2_25G
 332         default 0x80000000 if VMSPLIT_2G
 333         default 0x40000000 if VMSPLIT_1G
 334         default 0xC0000000
 335
 336 source "mm/Kconfig"
 337
 338 source "kernel/Kconfig.preempt"
 339
 340 config CMDLINE_BOOL
 341         bool "Built-in kernel command line"
 342         default n
 343         ---help---
 344           Allow for specifying boot arguments to the kernel at
 345           build time.  On some systems (e.g. embedded ones), it is
 346           necessary or convenient to provide some or all of the
 347           kernel boot arguments with the kernel itself (that is,
 348           to not rely on the boot loader to provide them.)
 349
 350           To compile command line arguments into the kernel,
 351           set this option to 'Y', then fill in the
 352           the boot arguments in CONFIG_CMDLINE.
 353
 354           Systems with fully functional boot loaders (e.g. mboot, or
 355           if booting over PCI) should leave this option set to 'N'.
 356
 357 config CMDLINE
 358         string "Built-in kernel command string"
 359         depends on CMDLINE_BOOL
 360         default ""
 361         ---help---
 362           Enter arguments here that should be compiled into the kernel
 363           image and used at boot time.  If the boot loader provides a
 364           command line at boot time, it is appended to this string to
 365           form the full kernel command line, when the system boots.
 366
 367           However, you can use the CONFIG_CMDLINE_OVERRIDE option to
 368           change this behavior.
 369
 370           In most cases, the command line (whether built-in or provided
 371           by the boot loader) should specify the device for the root
 372           file system.
 373
 374 config CMDLINE_OVERRIDE
 375         bool "Built-in command line overrides boot loader arguments"
 376         default n
 377         depends on CMDLINE_BOOL
 378         ---help---
 379           Set this option to 'Y' to have the kernel ignore the boot loader
 380           command line, and use ONLY the built-in command line.
 381
 382           This is used to work around broken boot loaders.  This should
 383           be set to 'N' under normal conditions.
 384
 385 config VMALLOC_RESERVE
 386         hex
 387         default 0x2000000
 388
 389 config HARDWALL
 390         bool "Hardwall support to allow access to user dynamic network"
 391         default y
 392
 393 config KERNEL_PL
 394         int "Processor protection level for kernel"
 395         range 1 2
 396         default 2 if TILEGX
 397         default 1 if !TILEGX
 398         ---help---
 399           Since MDE 4.2, the Tilera hypervisor runs the kernel
 400           at PL2 by default.  If running under an older hypervisor,
 401           or as a KVM guest, you must run at PL1.  (The current
 402           hypervisor may also be recompiled with "make HV_PL=2" to
 403           allow it to run a kernel at PL1, but clients running at PL1
 404           are not expected to be supported indefinitely.)
 405
 406           If you're not sure, don't change the default.
 407
 408 source "arch/tile/gxio/Kconfig"
 409
 410 endmenu  # Tilera-specific configuration
 411
 412 menu "Bus options"
 413
 414 config PCI
 415         bool "PCI support"
 416         default y
 417         select PCI_DOMAINS
 418         select GENERIC_PCI_IOMAP
 419         select TILE_GXIO_TRIO if TILEGX
 420         select PCI_MSI if TILEGX
 421         ---help---
 422           Enable PCI root complex support, so PCIe endpoint devices can
 423           be attached to the Tile chip.  Many, but not all, PCI devices
 424           are supported under Tilera's root complex driver.
 425
 426 config PCI_DOMAINS
 427         bool
 428
 429 config NO_IOMEM
 430         def_bool !PCI
 431
 432 config NO_IOPORT_MAP
 433         def_bool !PCI
 434
 435 config TILE_PCI_IO
 436         bool "PCI I/O space support"
 437         default n
 438         depends on PCI
 439         depends on TILEGX
 440         ---help---
 441           Enable PCI I/O space support on TILEGx. Since the PCI I/O space
 442           is used by few modern PCIe endpoint devices, its support is disabled
 443           by default to save the TRIO PIO Region resource for other purposes.
 444
 445 source "drivers/pci/Kconfig"
 446
 447 config TILE_USB
 448         tristate "Tilera USB host adapter support"
 449         default y
 450         depends on USB
 451         depends on TILEGX
 452         select TILE_GXIO_USB_HOST
 453         ---help---
 454           Provides USB host adapter support for the built-in EHCI and OHCI
 455           interfaces on TILE-Gx chips.
 456
 457 endmenu
 458
 459 menu "Executable file formats"
 460
 461 source "fs/Kconfig.binfmt"
 462
 463 endmenu
 464
 465 source "net/Kconfig"
 466
 467 source "drivers/Kconfig"
 468
 469 source "fs/Kconfig"
 470
 471 source "arch/tile/Kconfig.debug"
 472
 473 source "security/Kconfig"
 474
 475 source "crypto/Kconfig"
 476
 477 source "lib/Kconfig"
 478
 479 source "arch/tile/kvm/Kconfig"