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
  26 # FIXME: investigate whether we need/want these options.
  27 #       select HAVE_IOREMAP_PROT
  28 #       select HAVE_OPTPROBES
  29 #       select HAVE_REGS_AND_STACK_ACCESS_API
  30 #       select HAVE_HW_BREAKPOINT
  31 #       select PERF_EVENTS
  32 #       select HAVE_USER_RETURN_NOTIFIER
  33 #       config NO_BOOTMEM
  34 #       config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  35 #       config HUGETLB_PAGE_SIZE_VARIABLE
  36
  37 config MMU
  38         def_bool y
  39
  40 config GENERIC_CSUM
  41         def_bool y
  42
  43 config SEMAPHORE_SLEEPERS
  44         def_bool y
  45
  46 config HAVE_ARCH_ALLOC_REMAP
  47         def_bool y
  48
  49 config HAVE_SETUP_PER_CPU_AREA
  50         def_bool y
  51
  52 config NEED_PER_CPU_PAGE_FIRST_CHUNK
  53         def_bool y
  54
  55 config SYS_SUPPORTS_HUGETLBFS
  56         def_bool y
  57
  58 # Support for additional huge page sizes besides HPAGE_SIZE.
  59 # The software support is currently only present in the TILE-Gx
  60 # hypervisor. TILEPro in any case does not support page sizes
  61 # larger than the default HPAGE_SIZE.
  62 config HUGETLB_SUPER_PAGES
  63         depends on HUGETLB_PAGE && TILEGX
  64         def_bool y
  65
  66 # FIXME: tilegx can implement a more efficient rwsem.
  67 config RWSEM_GENERIC_SPINLOCK
  68         def_bool y
  69
  70 # We have a very flat architecture from a migration point of view,
  71 # so save boot time by presetting this (particularly useful on tile-sim).
  72 config DEFAULT_MIGRATION_COST
  73         int
  74         default "10000000"
  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 config STRICT_DEVMEM
 111         def_bool y
 112
 113 # SMP is required for Tilera Linux.
 114 config SMP
 115         def_bool y
 116
 117 config HVC_TILE
 118         depends on TTY
 119         select HVC_DRIVER
 120         def_bool y
 121
 122 config TILEGX
 123         bool "Building with TILE-Gx (64-bit) compiler and toolchain"
 124
 125 config TILEPRO
 126         def_bool !TILEGX
 127
 128 config 64BIT
 129         def_bool TILEGX
 130
 131 config ARCH_DEFCONFIG
 132         string
 133         default "arch/tile/configs/tilepro_defconfig" if !TILEGX
 134         default "arch/tile/configs/tilegx_defconfig" if TILEGX
 135
 136 source "init/Kconfig"
 137
 138 source "kernel/Kconfig.freezer"
 139
 140 menu "Tilera-specific configuration"
 141
 142 config NR_CPUS
 143         int "Maximum number of tiles (2-255)"
 144         range 2 255
 145         depends on SMP
 146         default "64"
 147         ---help---
 148           Building with 64 is the recommended value, but a slightly
 149           smaller kernel memory footprint results from using a smaller
 150           value on chips with fewer tiles.
 151
 152 if TILEGX
 153
 154 choice
 155         prompt "Kernel page size"
 156         default PAGE_SIZE_64KB
 157         help
 158           This lets you select the page size of the kernel.  For best
 159           performance on memory-intensive applications, a page size of 64KB
 160           is recommended.  For workloads involving many small files, many
 161           connections, etc., it may be better to select 16KB, which uses
 162           memory more efficiently at some cost in TLB performance.
 163
 164           Note that this option is TILE-Gx specific; currently
 165           TILEPro page size is set by rebuilding the hypervisor.
 166
 167 config PAGE_SIZE_16KB
 168         bool "16KB"
 169
 170 config PAGE_SIZE_64KB
 171         bool "64KB"
 172
 173 endchoice
 174
 175 endif
 176
 177 source "kernel/Kconfig.hz"
 178
 179 config KEXEC
 180         bool "kexec system call"
 181         ---help---
 182           kexec is a system call that implements the ability to shutdown your
 183           current kernel, and to start another kernel.  It is like a reboot
 184           but it is independent of the system firmware.   It is used
 185           to implement the "mboot" Tilera booter.
 186
 187           The name comes from the similarity to the exec system call.
 188
 189 config COMPAT
 190         bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
 191         depends on TILEGX
 192         select COMPAT_BINFMT_ELF
 193         default y
 194         ---help---
 195           If enabled, the kernel will support running TILE-Gx binaries
 196           that were built with the -m32 option.
 197
 198 config SYSVIPC_COMPAT
 199         def_bool y
 200         depends on COMPAT && SYSVIPC
 201
 202 # We do not currently support disabling HIGHMEM on tile64 and tilepro.
 203 config HIGHMEM
 204         bool # "Support for more than 512 MB of RAM"
 205         default !TILEGX
 206         ---help---
 207           Linux can use the full amount of RAM in the system by
 208           default.  However, the address space of TILE processors is
 209           only 4 Gigabytes large. That means that, if you have a large
 210           amount of physical memory, not all of it can be "permanently
 211           mapped" by the kernel. The physical memory that's not
 212           permanently mapped is called "high memory".
 213
 214           If you are compiling a kernel which will never run on a
 215           machine with more than 512 MB total physical RAM, answer
 216           "false" here. This will result in the kernel mapping all of
 217           physical memory into the top 1 GB of virtual memory space.
 218
 219           If unsure, say "true".
 220
 221 config ZONE_DMA
 222         def_bool y
 223
 224 config IOMMU_HELPER
 225         bool
 226
 227 config NEED_SG_DMA_LENGTH
 228         bool
 229
 230 config SWIOTLB
 231         bool
 232         default TILEGX
 233         select IOMMU_HELPER
 234         select NEED_SG_DMA_LENGTH
 235         select ARCH_HAS_DMA_SET_COHERENT_MASK
 236
 237 # We do not currently support disabling NUMA.
 238 config NUMA
 239         bool # "NUMA Memory Allocation and Scheduler Support"
 240         depends on SMP && DISCONTIGMEM
 241         default y
 242         ---help---
 243           NUMA memory allocation is required for TILE processors
 244           unless booting with memory striping enabled in the
 245           hypervisor, or with only a single memory controller.
 246           It is recommended that this option always be enabled.
 247
 248 config NODES_SHIFT
 249         int "Log base 2 of the max number of memory controllers"
 250         default 2
 251         depends on NEED_MULTIPLE_NODES
 252         ---help---
 253           By default, 2, i.e. 2^2 == 4 DDR2 controllers.
 254           In a system with more controllers, this value should be raised.
 255
 256 choice
 257         depends on !TILEGX
 258         prompt "Memory split" if EXPERT
 259         default VMSPLIT_3G
 260         ---help---
 261           Select the desired split between kernel and user memory.
 262
 263           If the address range available to the kernel is less than the
 264           physical memory installed, the remaining memory will be available
 265           as "high memory". Accessing high memory is a little more costly
 266           than low memory, as it needs to be mapped into the kernel first.
 267           Note that increasing the kernel address space limits the range
 268           available to user programs, making the address space there
 269           tighter.  Selecting anything other than the default 3G/1G split
 270           will also likely make your kernel incompatible with binary-only
 271           kernel modules.
 272
 273           If you are not absolutely sure what you are doing, leave this
 274           option alone!
 275
 276         config VMSPLIT_3_75G
 277                 bool "3.75G/0.25G user/kernel split (no kernel networking)"
 278         config VMSPLIT_3_5G
 279                 bool "3.5G/0.5G user/kernel split"
 280         config VMSPLIT_3G
 281                 bool "3G/1G user/kernel split"
 282         config VMSPLIT_2_75G
 283                 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
 284         config VMSPLIT_2_5G
 285                 bool "2.5G/1.5G user/kernel split"
 286         config VMSPLIT_2_25G
 287                 bool "2.25G/1.75G user/kernel split"
 288         config VMSPLIT_2G
 289                 bool "2G/2G user/kernel split"
 290         config VMSPLIT_1G
 291                 bool "1G/3G user/kernel split"
 292 endchoice
 293
 294 config PAGE_OFFSET
 295         hex
 296         depends on !64BIT
 297         default 0xF0000000 if VMSPLIT_3_75G
 298         default 0xE0000000 if VMSPLIT_3_5G
 299         default 0xB0000000 if VMSPLIT_2_75G
 300         default 0xA0000000 if VMSPLIT_2_5G
 301         default 0x90000000 if VMSPLIT_2_25G
 302         default 0x80000000 if VMSPLIT_2G
 303         default 0x40000000 if VMSPLIT_1G
 304         default 0xC0000000
 305
 306 source "mm/Kconfig"
 307
 308 config CMDLINE_BOOL
 309         bool "Built-in kernel command line"
 310         default n
 311         ---help---
 312           Allow for specifying boot arguments to the kernel at
 313           build time.  On some systems (e.g. embedded ones), it is
 314           necessary or convenient to provide some or all of the
 315           kernel boot arguments with the kernel itself (that is,
 316           to not rely on the boot loader to provide them.)
 317
 318           To compile command line arguments into the kernel,
 319           set this option to 'Y', then fill in the
 320           the boot arguments in CONFIG_CMDLINE.
 321
 322           Systems with fully functional boot loaders (e.g. mboot, or
 323           if booting over PCI) should leave this option set to 'N'.
 324
 325 config CMDLINE
 326         string "Built-in kernel command string"
 327         depends on CMDLINE_BOOL
 328         default ""
 329         ---help---
 330           Enter arguments here that should be compiled into the kernel
 331           image and used at boot time.  If the boot loader provides a
 332           command line at boot time, it is appended to this string to
 333           form the full kernel command line, when the system boots.
 334
 335           However, you can use the CONFIG_CMDLINE_OVERRIDE option to
 336           change this behavior.
 337
 338           In most cases, the command line (whether built-in or provided
 339           by the boot loader) should specify the device for the root
 340           file system.
 341
 342 config CMDLINE_OVERRIDE
 343         bool "Built-in command line overrides boot loader arguments"
 344         default n
 345         depends on CMDLINE_BOOL
 346         ---help---
 347           Set this option to 'Y' to have the kernel ignore the boot loader
 348           command line, and use ONLY the built-in command line.
 349
 350           This is used to work around broken boot loaders.  This should
 351           be set to 'N' under normal conditions.
 352
 353 config VMALLOC_RESERVE
 354         hex
 355         default 0x1000000
 356
 357 config HARDWALL
 358         bool "Hardwall support to allow access to user dynamic network"
 359         default y
 360
 361 config KERNEL_PL
 362         int "Processor protection level for kernel"
 363         range 1 2
 364         default "1"
 365         ---help---
 366           This setting determines the processor protection level the
 367           kernel will be built to run at.  Generally you should use
 368           the default value here.
 369
 370 source "arch/tile/gxio/Kconfig"
 371
 372 endmenu  # Tilera-specific configuration
 373
 374 menu "Bus options"
 375
 376 config PCI
 377         bool "PCI support"
 378         default y
 379         select PCI_DOMAINS
 380         select GENERIC_PCI_IOMAP
 381         select TILE_GXIO_TRIO if TILEGX
 382         select ARCH_SUPPORTS_MSI if TILEGX
 383         select PCI_MSI if TILEGX
 384         ---help---
 385           Enable PCI root complex support, so PCIe endpoint devices can
 386           be attached to the Tile chip.  Many, but not all, PCI devices
 387           are supported under Tilera's root complex driver.
 388
 389 config PCI_DOMAINS
 390         bool
 391
 392 config NO_IOMEM
 393         def_bool !PCI
 394
 395 config NO_IOPORT
 396         def_bool !PCI
 397
 398 source "drivers/pci/Kconfig"
 399
 400 config TILE_USB
 401         tristate "Tilera USB host adapter support"
 402         default y
 403         depends on USB
 404         depends on TILEGX
 405         select TILE_GXIO_USB_HOST
 406         ---help---
 407           Provides USB host adapter support for the built-in EHCI and OHCI
 408           interfaces on TILE-Gx chips.
 409
 410 source "drivers/pci/hotplug/Kconfig"
 411
 412 endmenu
 413
 414 menu "Executable file formats"
 415
 416 # only elf supported
 417 config KCORE_ELF
 418         def_bool y
 419         depends on PROC_FS
 420
 421 source "fs/Kconfig.binfmt"
 422
 423 endmenu
 424
 425 source "net/Kconfig"
 426
 427 source "drivers/Kconfig"
 428
 429 source "fs/Kconfig"
 430
 431 source "arch/tile/Kconfig.debug"
 432
 433 source "security/Kconfig"
 434
 435 source "crypto/Kconfig"
 436
 437 source "lib/Kconfig"
 438
 439 source "arch/tile/kvm/Kconfig"