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 # FIXME: tilegx can implement a more efficient rwsem.
  68 config RWSEM_GENERIC_SPINLOCK
  69         def_bool y
  70
  71 # We only support gcc 4.4 and above, so this should work.
  72 config ARCH_SUPPORTS_OPTIMIZED_INLINING
  73         def_bool y
  74
  75 config ARCH_PHYS_ADDR_T_64BIT
  76         def_bool y
  77
  78 config ARCH_DMA_ADDR_T_64BIT
  79         def_bool y
  80
  81 config NEED_DMA_MAP_STATE
  82         def_bool y
  83
  84 config ARCH_HAS_DMA_SET_COHERENT_MASK
  85         bool
  86
  87 config LOCKDEP_SUPPORT
  88         def_bool y
  89
  90 config STACKTRACE_SUPPORT
  91         def_bool y
  92         select STACKTRACE
  93
  94 # We use discontigmem for now; at some point we may want to switch
  95 # to sparsemem (Tilera bug 7996).
  96 config ARCH_DISCONTIGMEM_ENABLE
  97         def_bool y
  98
  99 config ARCH_DISCONTIGMEM_DEFAULT
 100         def_bool y
 101
 102 config TRACE_IRQFLAGS_SUPPORT
 103         def_bool y
 104
 105 config STRICT_DEVMEM
 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         def_bool y
 116
 117 config TILEGX
 118         bool "Building with TILE-Gx (64-bit) compiler and toolchain"
 119
 120 config TILEPRO
 121         def_bool !TILEGX
 122
 123 config 64BIT
 124         def_bool TILEGX
 125
 126 config ARCH_DEFCONFIG
 127         string
 128         default "arch/tile/configs/tilepro_defconfig" if !TILEGX
 129         default "arch/tile/configs/tilegx_defconfig" if TILEGX
 130
 131 source "init/Kconfig"
 132
 133 source "kernel/Kconfig.freezer"
 134
 135 menu "Tilera-specific configuration"
 136
 137 config NR_CPUS
 138         int "Maximum number of tiles (2-255)"
 139         range 2 255
 140         depends on SMP
 141         default "64"
 142         ---help---
 143           Building with 64 is the recommended value, but a slightly
 144           smaller kernel memory footprint results from using a smaller
 145           value on chips with fewer tiles.
 146
 147 if TILEGX
 148
 149 choice
 150         prompt "Kernel page size"
 151         default PAGE_SIZE_64KB
 152         help
 153           This lets you select the page size of the kernel.  For best
 154           performance on memory-intensive applications, a page size of 64KB
 155           is recommended.  For workloads involving many small files, many
 156           connections, etc., it may be better to select 16KB, which uses
 157           memory more efficiently at some cost in TLB performance.
 158
 159           Note that this option is TILE-Gx specific; currently
 160           TILEPro page size is set by rebuilding the hypervisor.
 161
 162 config PAGE_SIZE_16KB
 163         bool "16KB"
 164
 165 config PAGE_SIZE_64KB
 166         bool "64KB"
 167
 168 endchoice
 169
 170 endif
 171
 172 source "kernel/Kconfig.hz"
 173
 174 config KEXEC
 175         bool "kexec system call"
 176         ---help---
 177           kexec is a system call that implements the ability to shutdown your
 178           current kernel, and to start another kernel.  It is like a reboot
 179           but it is independent of the system firmware.   It is used
 180           to implement the "mboot" Tilera booter.
 181
 182           The name comes from the similarity to the exec system call.
 183
 184 config COMPAT
 185         bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
 186         depends on TILEGX
 187         select COMPAT_BINFMT_ELF
 188         default y
 189         ---help---
 190           If enabled, the kernel will support running TILE-Gx binaries
 191           that were built with the -m32 option.
 192
 193 config SYSVIPC_COMPAT
 194         def_bool y
 195         depends on COMPAT && SYSVIPC
 196
 197 # We do not currently support disabling HIGHMEM on tile64 and tilepro.
 198 config HIGHMEM
 199         bool # "Support for more than 512 MB of RAM"
 200         default !TILEGX
 201         ---help---
 202           Linux can use the full amount of RAM in the system by
 203           default.  However, the address space of TILE processors is
 204           only 4 Gigabytes large. That means that, if you have a large
 205           amount of physical memory, not all of it can be "permanently
 206           mapped" by the kernel. The physical memory that's not
 207           permanently mapped is called "high memory".
 208
 209           If you are compiling a kernel which will never run on a
 210           machine with more than 512 MB total physical RAM, answer
 211           "false" here. This will result in the kernel mapping all of
 212           physical memory into the top 1 GB of virtual memory space.
 213
 214           If unsure, say "true".
 215
 216 config ZONE_DMA
 217         def_bool y
 218
 219 config IOMMU_HELPER
 220         bool
 221
 222 config NEED_SG_DMA_LENGTH
 223         bool
 224
 225 config SWIOTLB
 226         bool
 227         default TILEGX
 228         select IOMMU_HELPER
 229         select NEED_SG_DMA_LENGTH
 230         select ARCH_HAS_DMA_SET_COHERENT_MASK
 231
 232 # We do not currently support disabling NUMA.
 233 config NUMA
 234         bool # "NUMA Memory Allocation and Scheduler Support"
 235         depends on SMP && DISCONTIGMEM
 236         default y
 237         ---help---
 238           NUMA memory allocation is required for TILE processors
 239           unless booting with memory striping enabled in the
 240           hypervisor, or with only a single memory controller.
 241           It is recommended that this option always be enabled.
 242
 243 config NODES_SHIFT
 244         int "Log base 2 of the max number of memory controllers"
 245         default 2
 246         depends on NEED_MULTIPLE_NODES
 247         ---help---
 248           By default, 2, i.e. 2^2 == 4 DDR2 controllers.
 249           In a system with more controllers, this value should be raised.
 250
 251 choice
 252         depends on !TILEGX
 253         prompt "Memory split" if EXPERT
 254         default VMSPLIT_3G
 255         ---help---
 256           Select the desired split between kernel and user memory.
 257
 258           If the address range available to the kernel is less than the
 259           physical memory installed, the remaining memory will be available
 260           as "high memory". Accessing high memory is a little more costly
 261           than low memory, as it needs to be mapped into the kernel first.
 262           Note that increasing the kernel address space limits the range
 263           available to user programs, making the address space there
 264           tighter.  Selecting anything other than the default 3G/1G split
 265           will also likely make your kernel incompatible with binary-only
 266           kernel modules.
 267
 268           If you are not absolutely sure what you are doing, leave this
 269           option alone!
 270
 271         config VMSPLIT_3_75G
 272                 bool "3.75G/0.25G user/kernel split (no kernel networking)"
 273         config VMSPLIT_3_5G
 274                 bool "3.5G/0.5G user/kernel split"
 275         config VMSPLIT_3G
 276                 bool "3G/1G user/kernel split"
 277         config VMSPLIT_2_75G
 278                 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
 279         config VMSPLIT_2_5G
 280                 bool "2.5G/1.5G user/kernel split"
 281         config VMSPLIT_2_25G
 282                 bool "2.25G/1.75G user/kernel split"
 283         config VMSPLIT_2G
 284                 bool "2G/2G user/kernel split"
 285         config VMSPLIT_1G
 286                 bool "1G/3G user/kernel split"
 287 endchoice
 288
 289 config PAGE_OFFSET
 290         hex
 291         depends on !64BIT
 292         default 0xF0000000 if VMSPLIT_3_75G
 293         default 0xE0000000 if VMSPLIT_3_5G
 294         default 0xB0000000 if VMSPLIT_2_75G
 295         default 0xA0000000 if VMSPLIT_2_5G
 296         default 0x90000000 if VMSPLIT_2_25G
 297         default 0x80000000 if VMSPLIT_2G
 298         default 0x40000000 if VMSPLIT_1G
 299         default 0xC0000000
 300
 301 source "mm/Kconfig"
 302
 303 config CMDLINE_BOOL
 304         bool "Built-in kernel command line"
 305         default n
 306         ---help---
 307           Allow for specifying boot arguments to the kernel at
 308           build time.  On some systems (e.g. embedded ones), it is
 309           necessary or convenient to provide some or all of the
 310           kernel boot arguments with the kernel itself (that is,
 311           to not rely on the boot loader to provide them.)
 312
 313           To compile command line arguments into the kernel,
 314           set this option to 'Y', then fill in the
 315           the boot arguments in CONFIG_CMDLINE.
 316
 317           Systems with fully functional boot loaders (e.g. mboot, or
 318           if booting over PCI) should leave this option set to 'N'.
 319
 320 config CMDLINE
 321         string "Built-in kernel command string"
 322         depends on CMDLINE_BOOL
 323         default ""
 324         ---help---
 325           Enter arguments here that should be compiled into the kernel
 326           image and used at boot time.  If the boot loader provides a
 327           command line at boot time, it is appended to this string to
 328           form the full kernel command line, when the system boots.
 329
 330           However, you can use the CONFIG_CMDLINE_OVERRIDE option to
 331           change this behavior.
 332
 333           In most cases, the command line (whether built-in or provided
 334           by the boot loader) should specify the device for the root
 335           file system.
 336
 337 config CMDLINE_OVERRIDE
 338         bool "Built-in command line overrides boot loader arguments"
 339         default n
 340         depends on CMDLINE_BOOL
 341         ---help---
 342           Set this option to 'Y' to have the kernel ignore the boot loader
 343           command line, and use ONLY the built-in command line.
 344
 345           This is used to work around broken boot loaders.  This should
 346           be set to 'N' under normal conditions.
 347
 348 config VMALLOC_RESERVE
 349         hex
 350         default 0x1000000
 351
 352 config HARDWALL
 353         bool "Hardwall support to allow access to user dynamic network"
 354         default y
 355
 356 config KERNEL_PL
 357         int "Processor protection level for kernel"
 358         range 1 2
 359         default 2 if TILEGX
 360         default 1 if !TILEGX
 361         ---help---
 362           Since MDE 4.2, the Tilera hypervisor runs the kernel
 363           at PL2 by default.  If running under an older hypervisor,
 364           or as a KVM guest, you must run at PL1.  (The current
 365           hypervisor may also be recompiled with "make HV_PL=2" to
 366           allow it to run a kernel at PL1, but clients running at PL1
 367           are not expected to be supported indefinitely.)
 368
 369           If you're not sure, don't change the default.
 370
 371 source "arch/tile/gxio/Kconfig"
 372
 373 endmenu  # Tilera-specific configuration
 374
 375 menu "Bus options"
 376
 377 config PCI
 378         bool "PCI support"
 379         default y
 380         select PCI_DOMAINS
 381         select GENERIC_PCI_IOMAP
 382         select TILE_GXIO_TRIO if TILEGX
 383         select ARCH_SUPPORTS_MSI if TILEGX
 384         select PCI_MSI if TILEGX
 385         ---help---
 386           Enable PCI root complex support, so PCIe endpoint devices can
 387           be attached to the Tile chip.  Many, but not all, PCI devices
 388           are supported under Tilera's root complex driver.
 389
 390 config PCI_DOMAINS
 391         bool
 392
 393 config NO_IOMEM
 394         def_bool !PCI
 395
 396 config NO_IOPORT
 397         def_bool !PCI
 398
 399 source "drivers/pci/Kconfig"
 400
 401 config TILE_USB
 402         tristate "Tilera USB host adapter support"
 403         default y
 404         depends on USB
 405         depends on TILEGX
 406         select TILE_GXIO_USB_HOST
 407         ---help---
 408           Provides USB host adapter support for the built-in EHCI and OHCI
 409           interfaces on TILE-Gx chips.
 410
 411 source "drivers/pci/hotplug/Kconfig"
 412
 413 endmenu
 414
 415 menu "Executable file formats"
 416
 417 source "fs/Kconfig.binfmt"
 418
 419 endmenu
 420
 421 source "net/Kconfig"
 422
 423 source "drivers/Kconfig"
 424
 425 source "fs/Kconfig"
 426
 427 source "arch/tile/Kconfig.debug"
 428
 429 source "security/Kconfig"
 430
 431 source "crypto/Kconfig"
 432
 433 source "lib/Kconfig"
 434
 435 source "arch/tile/kvm/Kconfig"