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