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_PERF_EVENTS
   7         select USE_PMC if PERF_EVENTS
   8         select HAVE_DMA_ATTRS
   9         select HAVE_DMA_API_DEBUG
  10         select HAVE_KVM if !TILEGX
  11         select GENERIC_FIND_FIRST_BIT
  12         select SYSCTL_EXCEPTION_TRACE
  13         select CC_OPTIMIZE_FOR_SIZE
  14         select HAVE_DEBUG_KMEMLEAK
  15         select GENERIC_IRQ_PROBE
  16         select GENERIC_PENDING_IRQ if SMP
  17         select GENERIC_IRQ_SHOW
  18         select HAVE_DEBUG_BUGVERBOSE
  19         select VIRT_TO_BUS
  20         select SYS_HYPERVISOR
  21         select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
  22         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  23         select GENERIC_CLOCKEVENTS
  24         select MODULES_USE_ELF_RELA
  25         select HAVE_ARCH_TRACEHOOK
  26         select HAVE_SYSCALL_TRACEPOINTS
  27         select USER_STACKTRACE_SUPPORT
  28         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  29         select HAVE_DEBUG_STACKOVERFLOW
  30         select ARCH_WANT_FRAME_POINTERS
  31         select HAVE_CONTEXT_TRACKING
  32         select EDAC_SUPPORT
  33         select GENERIC_STRNCPY_FROM_USER
  34         select GENERIC_STRNLEN_USER
  35         select HAVE_ARCH_SECCOMP_FILTER
  36
  37 # FIXME: investigate whether we need/want these options.
  38 #       select HAVE_IOREMAP_PROT
  39 #       select HAVE_OPTPROBES
  40 #       select HAVE_REGS_AND_STACK_ACCESS_API
  41 #       select HAVE_HW_BREAKPOINT
  42 #       select PERF_EVENTS
  43 #       select HAVE_USER_RETURN_NOTIFIER
  44 #       config NO_BOOTMEM
  45 #       config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  46 #       config HUGETLB_PAGE_SIZE_VARIABLE
  47
  48 config MMU
  49         def_bool y
  50
  51 config GENERIC_CSUM
  52         def_bool y
  53
  54 config HAVE_ARCH_ALLOC_REMAP
  55         def_bool y
  56
  57 config HAVE_SETUP_PER_CPU_AREA
  58         def_bool y
  59
  60 config NEED_PER_CPU_PAGE_FIRST_CHUNK
  61         def_bool y
  62
  63 config SYS_SUPPORTS_HUGETLBFS
  64         def_bool y
  65
  66 # Support for additional huge page sizes besides HPAGE_SIZE.
  67 # The software support is currently only present in the TILE-Gx
  68 # hypervisor. TILEPro in any case does not support page sizes
  69 # larger than the default HPAGE_SIZE.
  70 config HUGETLB_SUPER_PAGES
  71         depends on HUGETLB_PAGE && TILEGX
  72         def_bool y
  73
  74 config GENERIC_TIME_VSYSCALL
  75         def_bool y
  76
  77 # Enable PMC if PERF_EVENTS, OPROFILE, or WATCHPOINTS are enabled.
  78 config USE_PMC
  79         bool
  80
  81 # FIXME: tilegx can implement a more efficient rwsem.
  82 config RWSEM_GENERIC_SPINLOCK
  83         def_bool y
  84
  85 # We only support gcc 4.4 and above, so this should work.
  86 config ARCH_SUPPORTS_OPTIMIZED_INLINING
  87         def_bool y
  88
  89 config ARCH_PHYS_ADDR_T_64BIT
  90         def_bool y
  91
  92 config ARCH_DMA_ADDR_T_64BIT
  93         def_bool y
  94
  95 config NEED_DMA_MAP_STATE
  96         def_bool y
  97
  98 config ARCH_HAS_DMA_SET_COHERENT_MASK
  99         bool
 100
 101 config LOCKDEP_SUPPORT
 102         def_bool y
 103
 104 config STACKTRACE_SUPPORT
 105         def_bool y
 106         select STACKTRACE
 107
 108 # We use discontigmem for now; at some point we may want to switch
 109 # to sparsemem (Tilera bug 7996).
 110 config ARCH_DISCONTIGMEM_ENABLE
 111         def_bool y
 112
 113 config ARCH_DISCONTIGMEM_DEFAULT
 114         def_bool y
 115
 116 config TRACE_IRQFLAGS_SUPPORT
 117         def_bool y
 118
 119 config STRICT_DEVMEM
 120         def_bool y
 121
 122 # SMP is required for Tilera Linux.
 123 config SMP
 124         def_bool y
 125
 126 config HVC_TILE
 127         depends on TTY
 128         select HVC_DRIVER
 129         select HVC_IRQ if TILEGX
 130         def_bool y
 131
 132 # Building with ARCH=tilegx (or ARCH=tile) implies using the
 133 # 64-bit TILE-Gx toolchain, so force CONFIG_TILEGX on.
 134 config TILEGX
 135         def_bool ARCH != "tilepro"
 136         select SPARSE_IRQ
 137         select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
 138         select HAVE_FUNCTION_TRACER
 139         select HAVE_FUNCTION_GRAPH_TRACER
 140         select HAVE_DYNAMIC_FTRACE
 141         select HAVE_FTRACE_MCOUNT_RECORD
 142         select HAVE_KPROBES
 143         select HAVE_KRETPROBES
 144         select HAVE_ARCH_KGDB
 145         select ARCH_SUPPORTS_ATOMIC_RMW
 146
 147 config TILEPRO
 148         def_bool !TILEGX
 149
 150 config 64BIT
 151         def_bool TILEGX
 152
 153 config ARCH_DEFCONFIG
 154         string
 155         default "arch/tile/configs/tilepro_defconfig" if !TILEGX
 156         default "arch/tile/configs/tilegx_defconfig" if TILEGX
 157
 158 config PGTABLE_LEVELS
 159         int
 160         default 3 if 64BIT
 161         default 2
 162
 163 source "init/Kconfig"
 164
 165 source "kernel/Kconfig.freezer"
 166
 167 menu "Tilera-specific configuration"
 168
 169 config NR_CPUS
 170         int "Maximum number of tiles (2-255)"
 171         range 2 255
 172         depends on SMP
 173         default "64"
 174         ---help---
 175           Building with 64 is the recommended value, but a slightly
 176           smaller kernel memory footprint results from using a smaller
 177           value on chips with fewer tiles.
 178
 179 if TILEGX
 180
 181 choice
 182         prompt "Kernel page size"
 183         default PAGE_SIZE_64KB
 184         help
 185           This lets you select the page size of the kernel.  For best
 186           performance on memory-intensive applications, a page size of 64KB
 187           is recommended.  For workloads involving many small files, many
 188           connections, etc., it may be better to select 16KB, which uses
 189           memory more efficiently at some cost in TLB performance.
 190
 191           Note that this option is TILE-Gx specific; currently
 192           TILEPro page size is set by rebuilding the hypervisor.
 193
 194 config PAGE_SIZE_16KB
 195         bool "16KB"
 196
 197 config PAGE_SIZE_64KB
 198         bool "64KB"
 199
 200 endchoice
 201
 202 endif
 203
 204 source "kernel/Kconfig.hz"
 205
 206 config KEXEC
 207         bool "kexec system call"
 208         select KEXEC_CORE
 209         ---help---
 210           kexec is a system call that implements the ability to shutdown your
 211           current kernel, and to start another kernel.  It is like a reboot
 212           but it is independent of the system firmware.   It is used
 213           to implement the "mboot" Tilera booter.
 214
 215           The name comes from the similarity to the exec system call.
 216
 217 config COMPAT
 218         bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
 219         depends on TILEGX
 220         select COMPAT_BINFMT_ELF
 221         default y
 222         ---help---
 223           If enabled, the kernel will support running TILE-Gx binaries
 224           that were built with the -m32 option.
 225
 226 config SECCOMP
 227         bool "Enable seccomp to safely compute untrusted bytecode"
 228         depends on PROC_FS
 229         help
 230           This kernel feature is useful for number crunching applications
 231           that may need to compute untrusted bytecode during their
 232           execution. By using pipes or other transports made available to
 233           the process as file descriptors supporting the read/write
 234           syscalls, it's possible to isolate those applications in
 235           their own address space using seccomp. Once seccomp is
 236           enabled via prctl, it cannot be disabled and the task is only
 237           allowed to execute a few safe syscalls defined by each seccomp
 238           mode.
 239
 240           If unsure, say N.
 241
 242 config SYSVIPC_COMPAT
 243         def_bool y
 244         depends on COMPAT && SYSVIPC
 245
 246 # We do not currently support disabling HIGHMEM on tilepro.
 247 config HIGHMEM
 248         bool # "Support for more than 512 MB of RAM"
 249         default !TILEGX
 250         ---help---
 251           Linux can use the full amount of RAM in the system by
 252           default.  However, the address space of TILE processors is
 253           only 4 Gigabytes large. That means that, if you have a large
 254           amount of physical memory, not all of it can be "permanently
 255           mapped" by the kernel. The physical memory that's not
 256           permanently mapped is called "high memory".
 257
 258           If you are compiling a kernel which will never run on a
 259           machine with more than 512 MB total physical RAM, answer
 260           "false" here. This will result in the kernel mapping all of
 261           physical memory into the top 1 GB of virtual memory space.
 262
 263           If unsure, say "true".
 264
 265 config ZONE_DMA
 266         def_bool y
 267
 268 config IOMMU_HELPER
 269         bool
 270
 271 config NEED_SG_DMA_LENGTH
 272         bool
 273
 274 config SWIOTLB
 275         bool
 276         default TILEGX
 277         select IOMMU_HELPER
 278         select NEED_SG_DMA_LENGTH
 279         select ARCH_HAS_DMA_SET_COHERENT_MASK
 280
 281 # We do not currently support disabling NUMA.
 282 config NUMA
 283         bool # "NUMA Memory Allocation and Scheduler Support"
 284         depends on SMP && DISCONTIGMEM
 285         default y
 286         ---help---
 287           NUMA memory allocation is required for TILE processors
 288           unless booting with memory striping enabled in the
 289           hypervisor, or with only a single memory controller.
 290           It is recommended that this option always be enabled.
 291
 292 config NODES_SHIFT
 293         int "Log base 2 of the max number of memory controllers"
 294         default 2
 295         depends on NEED_MULTIPLE_NODES
 296         ---help---
 297           By default, 2, i.e. 2^2 == 4 DDR2 controllers.
 298           In a system with more controllers, this value should be raised.
 299
 300 choice
 301         depends on !TILEGX
 302         prompt "Memory split" if EXPERT
 303         default VMSPLIT_3G
 304         ---help---
 305           Select the desired split between kernel and user memory.
 306
 307           If the address range available to the kernel is less than the
 308           physical memory installed, the remaining memory will be available
 309           as "high memory". Accessing high memory is a little more costly
 310           than low memory, as it needs to be mapped into the kernel first.
 311           Note that increasing the kernel address space limits the range
 312           available to user programs, making the address space there
 313           tighter.  Selecting anything other than the default 3G/1G split
 314           will also likely make your kernel incompatible with binary-only
 315           kernel modules.
 316
 317           If you are not absolutely sure what you are doing, leave this
 318           option alone!
 319
 320         config VMSPLIT_3_75G
 321                 bool "3.75G/0.25G user/kernel split (no kernel networking)"
 322         config VMSPLIT_3_5G
 323                 bool "3.5G/0.5G user/kernel split"
 324         config VMSPLIT_3G
 325                 bool "3G/1G user/kernel split"
 326         config VMSPLIT_2_75G
 327                 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
 328         config VMSPLIT_2_5G
 329                 bool "2.5G/1.5G user/kernel split"
 330         config VMSPLIT_2_25G
 331                 bool "2.25G/1.75G user/kernel split"
 332         config VMSPLIT_2G
 333                 bool "2G/2G user/kernel split"
 334         config VMSPLIT_1G
 335                 bool "1G/3G user/kernel split"
 336 endchoice
 337
 338 config PAGE_OFFSET
 339         hex
 340         depends on !64BIT
 341         default 0xF0000000 if VMSPLIT_3_75G
 342         default 0xE0000000 if VMSPLIT_3_5G
 343         default 0xB0000000 if VMSPLIT_2_75G
 344         default 0xA0000000 if VMSPLIT_2_5G
 345         default 0x90000000 if VMSPLIT_2_25G
 346         default 0x80000000 if VMSPLIT_2G
 347         default 0x40000000 if VMSPLIT_1G
 348         default 0xC0000000
 349
 350 source "mm/Kconfig"
 351
 352 source "kernel/Kconfig.preempt"
 353
 354 config CMDLINE_BOOL
 355         bool "Built-in kernel command line"
 356         default n
 357         ---help---
 358           Allow for specifying boot arguments to the kernel at
 359           build time.  On some systems (e.g. embedded ones), it is
 360           necessary or convenient to provide some or all of the
 361           kernel boot arguments with the kernel itself (that is,
 362           to not rely on the boot loader to provide them.)
 363
 364           To compile command line arguments into the kernel,
 365           set this option to 'Y', then fill in the
 366           the boot arguments in CONFIG_CMDLINE.
 367
 368           Systems with fully functional boot loaders (e.g. mboot, or
 369           if booting over PCI) should leave this option set to 'N'.
 370
 371 config CMDLINE
 372         string "Built-in kernel command string"
 373         depends on CMDLINE_BOOL
 374         default ""
 375         ---help---
 376           Enter arguments here that should be compiled into the kernel
 377           image and used at boot time.  If the boot loader provides a
 378           command line at boot time, it is appended to this string to
 379           form the full kernel command line, when the system boots.
 380
 381           However, you can use the CONFIG_CMDLINE_OVERRIDE option to
 382           change this behavior.
 383
 384           In most cases, the command line (whether built-in or provided
 385           by the boot loader) should specify the device for the root
 386           file system.
 387
 388 config CMDLINE_OVERRIDE
 389         bool "Built-in command line overrides boot loader arguments"
 390         default n
 391         depends on CMDLINE_BOOL
 392         ---help---
 393           Set this option to 'Y' to have the kernel ignore the boot loader
 394           command line, and use ONLY the built-in command line.
 395
 396           This is used to work around broken boot loaders.  This should
 397           be set to 'N' under normal conditions.
 398
 399 config VMALLOC_RESERVE
 400         hex
 401         default 0x2000000
 402
 403 config HARDWALL
 404         bool "Hardwall support to allow access to user dynamic network"
 405         default y
 406
 407 config KERNEL_PL
 408         int "Processor protection level for kernel"
 409         range 1 2
 410         default 2 if TILEGX
 411         default 1 if !TILEGX
 412         ---help---
 413           Since MDE 4.2, the Tilera hypervisor runs the kernel
 414           at PL2 by default.  If running under an older hypervisor,
 415           or as a KVM guest, you must run at PL1.  (The current
 416           hypervisor may also be recompiled with "make HV_PL=2" to
 417           allow it to run a kernel at PL1, but clients running at PL1
 418           are not expected to be supported indefinitely.)
 419
 420           If you're not sure, don't change the default.
 421
 422 source "arch/tile/gxio/Kconfig"
 423
 424 endmenu  # Tilera-specific configuration
 425
 426 menu "Bus options"
 427
 428 config PCI
 429         bool "PCI support"
 430         default y
 431         select PCI_DOMAINS
 432         select GENERIC_PCI_IOMAP
 433         select TILE_GXIO_TRIO if TILEGX
 434         select PCI_MSI if TILEGX
 435         ---help---
 436           Enable PCI root complex support, so PCIe endpoint devices can
 437           be attached to the Tile chip.  Many, but not all, PCI devices
 438           are supported under Tilera's root complex driver.
 439
 440 config PCI_DOMAINS
 441         bool
 442
 443 config NO_IOMEM
 444         def_bool !PCI
 445
 446 config NO_IOPORT_MAP
 447         def_bool !PCI
 448
 449 config TILE_PCI_IO
 450         bool "PCI I/O space support"
 451         default n
 452         depends on PCI
 453         depends on TILEGX
 454         ---help---
 455           Enable PCI I/O space support on TILEGx. Since the PCI I/O space
 456           is used by few modern PCIe endpoint devices, its support is disabled
 457           by default to save the TRIO PIO Region resource for other purposes.
 458
 459 source "drivers/pci/Kconfig"
 460
 461 source "drivers/pci/pcie/Kconfig"
 462
 463 config TILE_USB
 464         tristate "Tilera USB host adapter support"
 465         default y
 466         depends on USB
 467         depends on TILEGX
 468         select TILE_GXIO_USB_HOST
 469         ---help---
 470           Provides USB host adapter support for the built-in EHCI and OHCI
 471           interfaces on TILE-Gx chips.
 472
 473 source "drivers/pci/hotplug/Kconfig"
 474
 475 endmenu
 476
 477 menu "Executable file formats"
 478
 479 source "fs/Kconfig.binfmt"
 480
 481 endmenu
 482
 483 source "net/Kconfig"
 484
 485 source "drivers/Kconfig"
 486
 487 source "fs/Kconfig"
 488
 489 source "arch/tile/Kconfig.debug"
 490
 491 source "security/Kconfig"
 492
 493 source "crypto/Kconfig"
 494
 495 source "lib/Kconfig"
 496
 497 source "arch/tile/kvm/Kconfig"