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_ATOMIC64_DEC_IF_POSITIVE
   7         select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
   8         select ARCH_HAS_DEVMEM_IS_ALLOWED
   9         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  10         select ARCH_WANT_FRAME_POINTERS
  11         select CC_OPTIMIZE_FOR_SIZE
  12         select EDAC_SUPPORT
  13         select GENERIC_CLOCKEVENTS
  14         select GENERIC_FIND_FIRST_BIT
  15         select GENERIC_IRQ_PROBE
  16         select GENERIC_IRQ_SHOW
  17         select GENERIC_PENDING_IRQ if SMP
  18         select GENERIC_STRNCPY_FROM_USER
  19         select GENERIC_STRNLEN_USER
  20         select HAVE_ARCH_SECCOMP_FILTER
  21         select HAVE_ARCH_TRACEHOOK
  22         select HAVE_CONTEXT_TRACKING
  23         select HAVE_DEBUG_BUGVERBOSE
  24         select HAVE_DEBUG_KMEMLEAK
  25         select HAVE_DEBUG_STACKOVERFLOW
  26         select HAVE_DMA_API_DEBUG
  27         select HAVE_EXIT_THREAD
  28         select HAVE_KVM if !TILEGX
  29         select HAVE_NMI if USE_PMC
  30         select HAVE_PERF_EVENTS
  31         select HAVE_SYSCALL_TRACEPOINTS
  32         select MODULES_USE_ELF_RELA
  33         select SYSCTL_EXCEPTION_TRACE
  34         select SYS_HYPERVISOR
  35         select USER_STACKTRACE_SUPPORT
  36         select USE_PMC if PERF_EVENTS
  37         select VIRT_TO_BUS
  38
  39 config MMU
  40         def_bool y
  41
  42 config GENERIC_CSUM
  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 config GENERIC_TIME_VSYSCALL
  66         def_bool y
  67
  68 # Enable PMC if PERF_EVENTS, OPROFILE, or WATCHPOINTS are enabled.
  69 config USE_PMC
  70         bool
  71
  72 # FIXME: tilegx can implement a more efficient rwsem.
  73 config RWSEM_GENERIC_SPINLOCK
  74         def_bool y
  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 # SMP is required for Tilera Linux.
 111 config SMP
 112         def_bool y
 113
 114 config HVC_TILE
 115         depends on TTY
 116         select HVC_DRIVER
 117         select HVC_IRQ if TILEGX
 118         def_bool y
 119
 120 # Building with ARCH=tilegx (or ARCH=tile) implies using the
 121 # 64-bit TILE-Gx toolchain, so force CONFIG_TILEGX on.
 122 config TILEGX
 123         def_bool ARCH != "tilepro"
 124         select ARCH_SUPPORTS_ATOMIC_RMW
 125         select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
 126         select HAVE_ARCH_JUMP_LABEL
 127         select HAVE_ARCH_KGDB
 128         select HAVE_DYNAMIC_FTRACE
 129         select HAVE_FTRACE_MCOUNT_RECORD
 130         select HAVE_FUNCTION_GRAPH_TRACER
 131         select HAVE_FUNCTION_TRACER
 132         select HAVE_KPROBES
 133         select HAVE_KRETPROBES
 134         select SPARSE_IRQ
 135
 136 config TILEPRO
 137         def_bool !TILEGX
 138
 139 config 64BIT
 140         def_bool TILEGX
 141
 142 config ARCH_DEFCONFIG
 143         string
 144         default "arch/tile/configs/tilepro_defconfig" if !TILEGX
 145         default "arch/tile/configs/tilegx_defconfig" if TILEGX
 146
 147 config PGTABLE_LEVELS
 148         int
 149         default 3 if 64BIT
 150         default 2
 151
 152 source "init/Kconfig"
 153
 154 source "kernel/Kconfig.freezer"
 155
 156 menu "Tilera-specific configuration"
 157
 158 config NR_CPUS
 159         int "Maximum number of tiles (2-255)"
 160         range 2 255
 161         depends on SMP
 162         default "64"
 163         ---help---
 164           Building with 64 is the recommended value, but a slightly
 165           smaller kernel memory footprint results from using a smaller
 166           value on chips with fewer tiles.
 167
 168 choice
 169         prompt "Kernel page size"
 170         default PAGE_SIZE_64KB
 171         help
 172           This lets you select the page size of the kernel.  For best
 173           performance on memory-intensive applications, a page size of 64KB
 174           is recommended.  For workloads involving many small files, many
 175           connections, etc., it may be better to select 16KB, which uses
 176           memory more efficiently at some cost in TLB performance.
 177
 178           Note that for TILEPro, you must also rebuild the hypervisor
 179           with a matching page size.
 180
 181 config PAGE_SIZE_4KB
 182         bool "4KB" if TILEPRO
 183
 184 config PAGE_SIZE_16KB
 185         bool "16KB"
 186
 187 config PAGE_SIZE_64KB
 188         bool "64KB"
 189
 190 endchoice
 191
 192 source "kernel/Kconfig.hz"
 193
 194 config KEXEC
 195         bool "kexec system call"
 196         select KEXEC_CORE
 197         ---help---
 198           kexec is a system call that implements the ability to shutdown your
 199           current kernel, and to start another kernel.  It is like a reboot
 200           but it is independent of the system firmware.   It is used
 201           to implement the "mboot" Tilera booter.
 202
 203           The name comes from the similarity to the exec system call.
 204
 205 config COMPAT
 206         bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
 207         depends on TILEGX
 208         select COMPAT_BINFMT_ELF
 209         default y
 210         ---help---
 211           If enabled, the kernel will support running TILE-Gx binaries
 212           that were built with the -m32 option.
 213
 214 config SECCOMP
 215         bool "Enable seccomp to safely compute untrusted bytecode"
 216         depends on PROC_FS
 217         help
 218           This kernel feature is useful for number crunching applications
 219           that may need to compute untrusted bytecode during their
 220           execution. By using pipes or other transports made available to
 221           the process as file descriptors supporting the read/write
 222           syscalls, it's possible to isolate those applications in
 223           their own address space using seccomp. Once seccomp is
 224           enabled via prctl, it cannot be disabled and the task is only
 225           allowed to execute a few safe syscalls defined by each seccomp
 226           mode.
 227
 228           If unsure, say N.
 229
 230 config SYSVIPC_COMPAT
 231         def_bool y
 232         depends on COMPAT && SYSVIPC
 233
 234 # We do not currently support disabling HIGHMEM on tilepro.
 235 config HIGHMEM
 236         bool # "Support for more than 512 MB of RAM"
 237         default !TILEGX
 238         ---help---
 239           Linux can use the full amount of RAM in the system by
 240           default.  However, the address space of TILE processors is
 241           only 4 Gigabytes large. That means that, if you have a large
 242           amount of physical memory, not all of it can be "permanently
 243           mapped" by the kernel. The physical memory that's not
 244           permanently mapped is called "high memory".
 245
 246           If you are compiling a kernel which will never run on a
 247           machine with more than 512 MB total physical RAM, answer
 248           "false" here. This will result in the kernel mapping all of
 249           physical memory into the top 1 GB of virtual memory space.
 250
 251           If unsure, say "true".
 252
 253 config ZONE_DMA
 254         def_bool y
 255
 256 config IOMMU_HELPER
 257         bool
 258
 259 config NEED_SG_DMA_LENGTH
 260         bool
 261
 262 config SWIOTLB
 263         bool
 264         default TILEGX
 265         select IOMMU_HELPER
 266         select NEED_SG_DMA_LENGTH
 267         select ARCH_HAS_DMA_SET_COHERENT_MASK
 268
 269 # We do not currently support disabling NUMA.
 270 config NUMA
 271         bool # "NUMA Memory Allocation and Scheduler Support"
 272         depends on SMP && DISCONTIGMEM
 273         default y
 274         ---help---
 275           NUMA memory allocation is required for TILE processors
 276           unless booting with memory striping enabled in the
 277           hypervisor, or with only a single memory controller.
 278           It is recommended that this option always be enabled.
 279
 280 config NODES_SHIFT
 281         int "Log base 2 of the max number of memory controllers"
 282         default 2
 283         depends on NEED_MULTIPLE_NODES
 284         ---help---
 285           By default, 2, i.e. 2^2 == 4 DDR2 controllers.
 286           In a system with more controllers, this value should be raised.
 287
 288 choice
 289         depends on !TILEGX
 290         prompt "Memory split" if EXPERT
 291         default VMSPLIT_3G
 292         ---help---
 293           Select the desired split between kernel and user memory.
 294
 295           If the address range available to the kernel is less than the
 296           physical memory installed, the remaining memory will be available
 297           as "high memory". Accessing high memory is a little more costly
 298           than low memory, as it needs to be mapped into the kernel first.
 299           Note that increasing the kernel address space limits the range
 300           available to user programs, making the address space there
 301           tighter.  Selecting anything other than the default 3G/1G split
 302           will also likely make your kernel incompatible with binary-only
 303           kernel modules.
 304
 305           If you are not absolutely sure what you are doing, leave this
 306           option alone!
 307
 308         config VMSPLIT_3_75G
 309                 bool "3.75G/0.25G user/kernel split (no kernel networking)"
 310         config VMSPLIT_3_5G
 311                 bool "3.5G/0.5G user/kernel split"
 312         config VMSPLIT_3G
 313                 bool "3G/1G user/kernel split"
 314         config VMSPLIT_2_75G
 315                 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
 316         config VMSPLIT_2_5G
 317                 bool "2.5G/1.5G user/kernel split"
 318         config VMSPLIT_2_25G
 319                 bool "2.25G/1.75G user/kernel split"
 320         config VMSPLIT_2G
 321                 bool "2G/2G user/kernel split"
 322         config VMSPLIT_1G
 323                 bool "1G/3G user/kernel split"
 324 endchoice
 325
 326 config PAGE_OFFSET
 327         hex
 328         depends on !64BIT
 329         default 0xF0000000 if VMSPLIT_3_75G
 330         default 0xE0000000 if VMSPLIT_3_5G
 331         default 0xB0000000 if VMSPLIT_2_75G
 332         default 0xA0000000 if VMSPLIT_2_5G
 333         default 0x90000000 if VMSPLIT_2_25G
 334         default 0x80000000 if VMSPLIT_2G
 335         default 0x40000000 if VMSPLIT_1G
 336         default 0xC0000000
 337
 338 source "mm/Kconfig"
 339
 340 source "kernel/Kconfig.preempt"
 341
 342 config CMDLINE_BOOL
 343         bool "Built-in kernel command line"
 344         default n
 345         ---help---
 346           Allow for specifying boot arguments to the kernel at
 347           build time.  On some systems (e.g. embedded ones), it is
 348           necessary or convenient to provide some or all of the
 349           kernel boot arguments with the kernel itself (that is,
 350           to not rely on the boot loader to provide them.)
 351
 352           To compile command line arguments into the kernel,
 353           set this option to 'Y', then fill in the
 354           the boot arguments in CONFIG_CMDLINE.
 355
 356           Systems with fully functional boot loaders (e.g. mboot, or
 357           if booting over PCI) should leave this option set to 'N'.
 358
 359 config CMDLINE
 360         string "Built-in kernel command string"
 361         depends on CMDLINE_BOOL
 362         default ""
 363         ---help---
 364           Enter arguments here that should be compiled into the kernel
 365           image and used at boot time.  If the boot loader provides a
 366           command line at boot time, it is appended to this string to
 367           form the full kernel command line, when the system boots.
 368
 369           However, you can use the CONFIG_CMDLINE_OVERRIDE option to
 370           change this behavior.
 371
 372           In most cases, the command line (whether built-in or provided
 373           by the boot loader) should specify the device for the root
 374           file system.
 375
 376 config CMDLINE_OVERRIDE
 377         bool "Built-in command line overrides boot loader arguments"
 378         default n
 379         depends on CMDLINE_BOOL
 380         ---help---
 381           Set this option to 'Y' to have the kernel ignore the boot loader
 382           command line, and use ONLY the built-in command line.
 383
 384           This is used to work around broken boot loaders.  This should
 385           be set to 'N' under normal conditions.
 386
 387 config VMALLOC_RESERVE
 388         hex
 389         default 0x2000000
 390
 391 config HARDWALL
 392         bool "Hardwall support to allow access to user dynamic network"
 393         default y
 394
 395 config KERNEL_PL
 396         int "Processor protection level for kernel"
 397         range 1 2
 398         default 2 if TILEGX
 399         default 1 if !TILEGX
 400         ---help---
 401           Since MDE 4.2, the Tilera hypervisor runs the kernel
 402           at PL2 by default.  If running under an older hypervisor,
 403           or as a KVM guest, you must run at PL1.  (The current
 404           hypervisor may also be recompiled with "make HV_PL=2" to
 405           allow it to run a kernel at PL1, but clients running at PL1
 406           are not expected to be supported indefinitely.)
 407
 408           If you're not sure, don't change the default.
 409
 410 source "arch/tile/gxio/Kconfig"
 411
 412 endmenu  # Tilera-specific configuration
 413
 414 menu "Bus options"
 415
 416 config PCI
 417         bool "PCI support"
 418         default y
 419         select PCI_DOMAINS
 420         select GENERIC_PCI_IOMAP
 421         select TILE_GXIO_TRIO if TILEGX
 422         select PCI_MSI if TILEGX
 423         ---help---
 424           Enable PCI root complex support, so PCIe endpoint devices can
 425           be attached to the Tile chip.  Many, but not all, PCI devices
 426           are supported under Tilera's root complex driver.
 427
 428 config PCI_DOMAINS
 429         bool
 430
 431 config NO_IOMEM
 432         def_bool !PCI
 433
 434 config NO_IOPORT_MAP
 435         def_bool !PCI
 436
 437 config TILE_PCI_IO
 438         bool "PCI I/O space support"
 439         default n
 440         depends on PCI
 441         depends on TILEGX
 442         ---help---
 443           Enable PCI I/O space support on TILEGx. Since the PCI I/O space
 444           is used by few modern PCIe endpoint devices, its support is disabled
 445           by default to save the TRIO PIO Region resource for other purposes.
 446
 447 source "drivers/pci/Kconfig"
 448
 449 config TILE_USB
 450         tristate "Tilera USB host adapter support"
 451         default y
 452         depends on USB
 453         depends on TILEGX
 454         select TILE_GXIO_USB_HOST
 455         ---help---
 456           Provides USB host adapter support for the built-in EHCI and OHCI
 457           interfaces on TILE-Gx chips.
 458
 459 endmenu
 460
 461 menu "Executable file formats"
 462
 463 source "fs/Kconfig.binfmt"
 464
 465 endmenu
 466
 467 source "net/Kconfig"
 468
 469 source "drivers/Kconfig"
 470
 471 source "fs/Kconfig"
 472
 473 source "arch/tile/Kconfig.debug"
 474
 475 source "security/Kconfig"
 476
 477 source "crypto/Kconfig"
 478
 479 source "lib/Kconfig"
 480
 481 source "arch/tile/kvm/Kconfig"