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 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 ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  28         select HAVE_DEBUG_STACKOVERFLOW
  29
  30 # FIXME: investigate whether we need/want these options.
  31 #       select HAVE_IOREMAP_PROT
  32 #       select HAVE_OPTPROBES
  33 #       select HAVE_REGS_AND_STACK_ACCESS_API
  34 #       select HAVE_HW_BREAKPOINT
  35 #       select PERF_EVENTS
  36 #       select HAVE_USER_RETURN_NOTIFIER
  37 #       config NO_BOOTMEM
  38 #       config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  39 #       config HUGETLB_PAGE_SIZE_VARIABLE
  40
  41 config MMU
  42         def_bool y
  43
  44 config GENERIC_CSUM
  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 config GENERIC_TIME_VSYSCALL
  68         def_bool y
  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 config STRICT_DEVMEM
 109         def_bool y
 110
 111 # SMP is required for Tilera Linux.
 112 config SMP
 113         def_bool y
 114
 115 config HVC_TILE
 116         depends on TTY
 117         select HVC_DRIVER
 118         select HVC_IRQ if TILEGX
 119         def_bool y
 120
 121 config TILEGX
 122         bool "Building with TILE-Gx (64-bit) compiler and toolchain"
 123
 124 config TILEPRO
 125         def_bool !TILEGX
 126
 127 config 64BIT
 128         def_bool TILEGX
 129
 130 config ARCH_DEFCONFIG
 131         string
 132         default "arch/tile/configs/tilepro_defconfig" if !TILEGX
 133         default "arch/tile/configs/tilegx_defconfig" if TILEGX
 134
 135 source "init/Kconfig"
 136
 137 source "kernel/Kconfig.freezer"
 138
 139 menu "Tilera-specific configuration"
 140
 141 config NR_CPUS
 142         int "Maximum number of tiles (2-255)"
 143         range 2 255
 144         depends on SMP
 145         default "64"
 146         ---help---
 147           Building with 64 is the recommended value, but a slightly
 148           smaller kernel memory footprint results from using a smaller
 149           value on chips with fewer tiles.
 150
 151 if TILEGX
 152
 153 choice
 154         prompt "Kernel page size"
 155         default PAGE_SIZE_64KB
 156         help
 157           This lets you select the page size of the kernel.  For best
 158           performance on memory-intensive applications, a page size of 64KB
 159           is recommended.  For workloads involving many small files, many
 160           connections, etc., it may be better to select 16KB, which uses
 161           memory more efficiently at some cost in TLB performance.
 162
 163           Note that this option is TILE-Gx specific; currently
 164           TILEPro page size is set by rebuilding the hypervisor.
 165
 166 config PAGE_SIZE_16KB
 167         bool "16KB"
 168
 169 config PAGE_SIZE_64KB
 170         bool "64KB"
 171
 172 endchoice
 173
 174 endif
 175
 176 source "kernel/Kconfig.hz"
 177
 178 config KEXEC
 179         bool "kexec system call"
 180         ---help---
 181           kexec is a system call that implements the ability to shutdown your
 182           current kernel, and to start another kernel.  It is like a reboot
 183           but it is independent of the system firmware.   It is used
 184           to implement the "mboot" Tilera booter.
 185
 186           The name comes from the similarity to the exec system call.
 187
 188 config COMPAT
 189         bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
 190         depends on TILEGX
 191         select COMPAT_BINFMT_ELF
 192         default y
 193         ---help---
 194           If enabled, the kernel will support running TILE-Gx binaries
 195           that were built with the -m32 option.
 196
 197 config SYSVIPC_COMPAT
 198         def_bool y
 199         depends on COMPAT && SYSVIPC
 200
 201 # We do not currently support disabling HIGHMEM on tile64 and tilepro.
 202 config HIGHMEM
 203         bool # "Support for more than 512 MB of RAM"
 204         default !TILEGX
 205         ---help---
 206           Linux can use the full amount of RAM in the system by
 207           default.  However, the address space of TILE processors is
 208           only 4 Gigabytes large. That means that, if you have a large
 209           amount of physical memory, not all of it can be "permanently
 210           mapped" by the kernel. The physical memory that's not
 211           permanently mapped is called "high memory".
 212
 213           If you are compiling a kernel which will never run on a
 214           machine with more than 512 MB total physical RAM, answer
 215           "false" here. This will result in the kernel mapping all of
 216           physical memory into the top 1 GB of virtual memory space.
 217
 218           If unsure, say "true".
 219
 220 config ZONE_DMA
 221         def_bool y
 222
 223 config IOMMU_HELPER
 224         bool
 225
 226 config NEED_SG_DMA_LENGTH
 227         bool
 228
 229 config SWIOTLB
 230         bool
 231         default TILEGX
 232         select IOMMU_HELPER
 233         select NEED_SG_DMA_LENGTH
 234         select ARCH_HAS_DMA_SET_COHERENT_MASK
 235
 236 # We do not currently support disabling NUMA.
 237 config NUMA
 238         bool # "NUMA Memory Allocation and Scheduler Support"
 239         depends on SMP && DISCONTIGMEM
 240         default y
 241         ---help---
 242           NUMA memory allocation is required for TILE processors
 243           unless booting with memory striping enabled in the
 244           hypervisor, or with only a single memory controller.
 245           It is recommended that this option always be enabled.
 246
 247 config NODES_SHIFT
 248         int "Log base 2 of the max number of memory controllers"
 249         default 2
 250         depends on NEED_MULTIPLE_NODES
 251         ---help---
 252           By default, 2, i.e. 2^2 == 4 DDR2 controllers.
 253           In a system with more controllers, this value should be raised.
 254
 255 choice
 256         depends on !TILEGX
 257         prompt "Memory split" if EXPERT
 258         default VMSPLIT_3G
 259         ---help---
 260           Select the desired split between kernel and user memory.
 261
 262           If the address range available to the kernel is less than the
 263           physical memory installed, the remaining memory will be available
 264           as "high memory". Accessing high memory is a little more costly
 265           than low memory, as it needs to be mapped into the kernel first.
 266           Note that increasing the kernel address space limits the range
 267           available to user programs, making the address space there
 268           tighter.  Selecting anything other than the default 3G/1G split
 269           will also likely make your kernel incompatible with binary-only
 270           kernel modules.
 271
 272           If you are not absolutely sure what you are doing, leave this
 273           option alone!
 274
 275         config VMSPLIT_3_75G
 276                 bool "3.75G/0.25G user/kernel split (no kernel networking)"
 277         config VMSPLIT_3_5G
 278                 bool "3.5G/0.5G user/kernel split"
 279         config VMSPLIT_3G
 280                 bool "3G/1G user/kernel split"
 281         config VMSPLIT_2_75G
 282                 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
 283         config VMSPLIT_2_5G
 284                 bool "2.5G/1.5G user/kernel split"
 285         config VMSPLIT_2_25G
 286                 bool "2.25G/1.75G user/kernel split"
 287         config VMSPLIT_2G
 288                 bool "2G/2G user/kernel split"
 289         config VMSPLIT_1G
 290                 bool "1G/3G user/kernel split"
 291 endchoice
 292
 293 config PAGE_OFFSET
 294         hex
 295         depends on !64BIT
 296         default 0xF0000000 if VMSPLIT_3_75G
 297         default 0xE0000000 if VMSPLIT_3_5G
 298         default 0xB0000000 if VMSPLIT_2_75G
 299         default 0xA0000000 if VMSPLIT_2_5G
 300         default 0x90000000 if VMSPLIT_2_25G
 301         default 0x80000000 if VMSPLIT_2G
 302         default 0x40000000 if VMSPLIT_1G
 303         default 0xC0000000
 304
 305 source "mm/Kconfig"
 306
 307 source "kernel/Kconfig.preempt"
 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 2 if TILEGX
 366         default 1 if !TILEGX
 367         ---help---
 368           Since MDE 4.2, the Tilera hypervisor runs the kernel
 369           at PL2 by default.  If running under an older hypervisor,
 370           or as a KVM guest, you must run at PL1.  (The current
 371           hypervisor may also be recompiled with "make HV_PL=2" to
 372           allow it to run a kernel at PL1, but clients running at PL1
 373           are not expected to be supported indefinitely.)
 374
 375           If you're not sure, don't change the default.
 376
 377 source "arch/tile/gxio/Kconfig"
 378
 379 endmenu  # Tilera-specific configuration
 380
 381 menu "Bus options"
 382
 383 config PCI
 384         bool "PCI support"
 385         default y
 386         select PCI_DOMAINS
 387         select GENERIC_PCI_IOMAP
 388         select TILE_GXIO_TRIO if TILEGX
 389         select ARCH_SUPPORTS_MSI if TILEGX
 390         select PCI_MSI if TILEGX
 391         ---help---
 392           Enable PCI root complex support, so PCIe endpoint devices can
 393           be attached to the Tile chip.  Many, but not all, PCI devices
 394           are supported under Tilera's root complex driver.
 395
 396 config PCI_DOMAINS
 397         bool
 398
 399 config NO_IOMEM
 400         def_bool !PCI
 401
 402 config NO_IOPORT
 403         def_bool !PCI
 404
 405 config TILE_PCI_IO
 406         bool "PCI I/O space support"
 407         default n
 408         depends on PCI
 409         depends on TILEGX
 410         ---help---
 411           Enable PCI I/O space support on TILEGx. Since the PCI I/O space
 412           is used by few modern PCIe endpoint devices, its support is disabled
 413           by default to save the TRIO PIO Region resource for other purposes.
 414
 415 source "drivers/pci/Kconfig"
 416
 417 source "drivers/pci/pcie/Kconfig"
 418
 419 config TILE_USB
 420         tristate "Tilera USB host adapter support"
 421         default y
 422         depends on USB
 423         depends on TILEGX
 424         select TILE_GXIO_USB_HOST
 425         ---help---
 426           Provides USB host adapter support for the built-in EHCI and OHCI
 427           interfaces on TILE-Gx chips.
 428
 429 source "drivers/pci/hotplug/Kconfig"
 430
 431 endmenu
 432
 433 menu "Executable file formats"
 434
 435 source "fs/Kconfig.binfmt"
 436
 437 endmenu
 438
 439 source "net/Kconfig"
 440
 441 source "drivers/Kconfig"
 442
 443 source "fs/Kconfig"
 444
 445 source "arch/tile/Kconfig.debug"
 446
 447 source "security/Kconfig"
 448
 449 source "crypto/Kconfig"
 450
 451 source "lib/Kconfig"
 452
 453 source "arch/tile/kvm/Kconfig"