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
  29 # FIXME: investigate whether we need/want these options.
  30 #       select HAVE_IOREMAP_PROT
  31 #       select HAVE_OPTPROBES
  32 #       select HAVE_REGS_AND_STACK_ACCESS_API
  33 #       select HAVE_HW_BREAKPOINT
  34 #       select PERF_EVENTS
  35 #       select HAVE_USER_RETURN_NOTIFIER
  36 #       config NO_BOOTMEM
  37 #       config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  38 #       config HUGETLB_PAGE_SIZE_VARIABLE
  39
  40 config MMU
  41         def_bool y
  42
  43 config GENERIC_CSUM
  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 only support gcc 4.4 and above, so this should work.
  71 config ARCH_SUPPORTS_OPTIMIZED_INLINING
  72         def_bool y
  73
  74 config ARCH_PHYS_ADDR_T_64BIT
  75         def_bool y
  76
  77 config ARCH_DMA_ADDR_T_64BIT
  78         def_bool y
  79
  80 config NEED_DMA_MAP_STATE
  81         def_bool y
  82
  83 config ARCH_HAS_DMA_SET_COHERENT_MASK
  84         bool
  85
  86 config LOCKDEP_SUPPORT
  87         def_bool y
  88
  89 config STACKTRACE_SUPPORT
  90         def_bool y
  91         select STACKTRACE
  92
  93 # We use discontigmem for now; at some point we may want to switch
  94 # to sparsemem (Tilera bug 7996).
  95 config ARCH_DISCONTIGMEM_ENABLE
  96         def_bool y
  97
  98 config ARCH_DISCONTIGMEM_DEFAULT
  99         def_bool y
 100
 101 config TRACE_IRQFLAGS_SUPPORT
 102         def_bool y
 103
 104 config STRICT_DEVMEM
 105         def_bool y
 106
 107 # SMP is required for Tilera Linux.
 108 config SMP
 109         def_bool y
 110
 111 config HVC_TILE
 112         depends on TTY
 113         select HVC_DRIVER
 114         def_bool y
 115
 116 config TILEGX
 117         bool "Building with TILE-Gx (64-bit) compiler and toolchain"
 118
 119 config TILEPRO
 120         def_bool !TILEGX
 121
 122 config 64BIT
 123         def_bool TILEGX
 124
 125 config ARCH_DEFCONFIG
 126         string
 127         default "arch/tile/configs/tilepro_defconfig" if !TILEGX
 128         default "arch/tile/configs/tilegx_defconfig" if TILEGX
 129
 130 source "init/Kconfig"
 131
 132 source "kernel/Kconfig.freezer"
 133
 134 menu "Tilera-specific configuration"
 135
 136 config NR_CPUS
 137         int "Maximum number of tiles (2-255)"
 138         range 2 255
 139         depends on SMP
 140         default "64"
 141         ---help---
 142           Building with 64 is the recommended value, but a slightly
 143           smaller kernel memory footprint results from using a smaller
 144           value on chips with fewer tiles.
 145
 146 if TILEGX
 147
 148 choice
 149         prompt "Kernel page size"
 150         default PAGE_SIZE_64KB
 151         help
 152           This lets you select the page size of the kernel.  For best
 153           performance on memory-intensive applications, a page size of 64KB
 154           is recommended.  For workloads involving many small files, many
 155           connections, etc., it may be better to select 16KB, which uses
 156           memory more efficiently at some cost in TLB performance.
 157
 158           Note that this option is TILE-Gx specific; currently
 159           TILEPro page size is set by rebuilding the hypervisor.
 160
 161 config PAGE_SIZE_16KB
 162         bool "16KB"
 163
 164 config PAGE_SIZE_64KB
 165         bool "64KB"
 166
 167 endchoice
 168
 169 endif
 170
 171 source "kernel/Kconfig.hz"
 172
 173 config KEXEC
 174         bool "kexec system call"
 175         ---help---
 176           kexec is a system call that implements the ability to shutdown your
 177           current kernel, and to start another kernel.  It is like a reboot
 178           but it is independent of the system firmware.   It is used
 179           to implement the "mboot" Tilera booter.
 180
 181           The name comes from the similarity to the exec system call.
 182
 183 config COMPAT
 184         bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
 185         depends on TILEGX
 186         select COMPAT_BINFMT_ELF
 187         default y
 188         ---help---
 189           If enabled, the kernel will support running TILE-Gx binaries
 190           that were built with the -m32 option.
 191
 192 config SYSVIPC_COMPAT
 193         def_bool y
 194         depends on COMPAT && SYSVIPC
 195
 196 # We do not currently support disabling HIGHMEM on tile64 and tilepro.
 197 config HIGHMEM
 198         bool # "Support for more than 512 MB of RAM"
 199         default !TILEGX
 200         ---help---
 201           Linux can use the full amount of RAM in the system by
 202           default.  However, the address space of TILE processors is
 203           only 4 Gigabytes large. That means that, if you have a large
 204           amount of physical memory, not all of it can be "permanently
 205           mapped" by the kernel. The physical memory that's not
 206           permanently mapped is called "high memory".
 207
 208           If you are compiling a kernel which will never run on a
 209           machine with more than 512 MB total physical RAM, answer
 210           "false" here. This will result in the kernel mapping all of
 211           physical memory into the top 1 GB of virtual memory space.
 212
 213           If unsure, say "true".
 214
 215 config ZONE_DMA
 216         def_bool y
 217
 218 config IOMMU_HELPER
 219         bool
 220
 221 config NEED_SG_DMA_LENGTH
 222         bool
 223
 224 config SWIOTLB
 225         bool
 226         default TILEGX
 227         select IOMMU_HELPER
 228         select NEED_SG_DMA_LENGTH
 229         select ARCH_HAS_DMA_SET_COHERENT_MASK
 230
 231 # We do not currently support disabling NUMA.
 232 config NUMA
 233         bool # "NUMA Memory Allocation and Scheduler Support"
 234         depends on SMP && DISCONTIGMEM
 235         default y
 236         ---help---
 237           NUMA memory allocation is required for TILE processors
 238           unless booting with memory striping enabled in the
 239           hypervisor, or with only a single memory controller.
 240           It is recommended that this option always be enabled.
 241
 242 config NODES_SHIFT
 243         int "Log base 2 of the max number of memory controllers"
 244         default 2
 245         depends on NEED_MULTIPLE_NODES
 246         ---help---
 247           By default, 2, i.e. 2^2 == 4 DDR2 controllers.
 248           In a system with more controllers, this value should be raised.
 249
 250 choice
 251         depends on !TILEGX
 252         prompt "Memory split" if EXPERT
 253         default VMSPLIT_3G
 254         ---help---
 255           Select the desired split between kernel and user memory.
 256
 257           If the address range available to the kernel is less than the
 258           physical memory installed, the remaining memory will be available
 259           as "high memory". Accessing high memory is a little more costly
 260           than low memory, as it needs to be mapped into the kernel first.
 261           Note that increasing the kernel address space limits the range
 262           available to user programs, making the address space there
 263           tighter.  Selecting anything other than the default 3G/1G split
 264           will also likely make your kernel incompatible with binary-only
 265           kernel modules.
 266
 267           If you are not absolutely sure what you are doing, leave this
 268           option alone!
 269
 270         config VMSPLIT_3_75G
 271                 bool "3.75G/0.25G user/kernel split (no kernel networking)"
 272         config VMSPLIT_3_5G
 273                 bool "3.5G/0.5G user/kernel split"
 274         config VMSPLIT_3G
 275                 bool "3G/1G user/kernel split"
 276         config VMSPLIT_2_75G
 277                 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
 278         config VMSPLIT_2_5G
 279                 bool "2.5G/1.5G user/kernel split"
 280         config VMSPLIT_2_25G
 281                 bool "2.25G/1.75G user/kernel split"
 282         config VMSPLIT_2G
 283                 bool "2G/2G user/kernel split"
 284         config VMSPLIT_1G
 285                 bool "1G/3G user/kernel split"
 286 endchoice
 287
 288 config PAGE_OFFSET
 289         hex
 290         depends on !64BIT
 291         default 0xF0000000 if VMSPLIT_3_75G
 292         default 0xE0000000 if VMSPLIT_3_5G
 293         default 0xB0000000 if VMSPLIT_2_75G
 294         default 0xA0000000 if VMSPLIT_2_5G
 295         default 0x90000000 if VMSPLIT_2_25G
 296         default 0x80000000 if VMSPLIT_2G
 297         default 0x40000000 if VMSPLIT_1G
 298         default 0xC0000000
 299
 300 source "mm/Kconfig"
 301
 302 config CMDLINE_BOOL
 303         bool "Built-in kernel command line"
 304         default n
 305         ---help---
 306           Allow for specifying boot arguments to the kernel at
 307           build time.  On some systems (e.g. embedded ones), it is
 308           necessary or convenient to provide some or all of the
 309           kernel boot arguments with the kernel itself (that is,
 310           to not rely on the boot loader to provide them.)
 311
 312           To compile command line arguments into the kernel,
 313           set this option to 'Y', then fill in the
 314           the boot arguments in CONFIG_CMDLINE.
 315
 316           Systems with fully functional boot loaders (e.g. mboot, or
 317           if booting over PCI) should leave this option set to 'N'.
 318
 319 config CMDLINE
 320         string "Built-in kernel command string"
 321         depends on CMDLINE_BOOL
 322         default ""
 323         ---help---
 324           Enter arguments here that should be compiled into the kernel
 325           image and used at boot time.  If the boot loader provides a
 326           command line at boot time, it is appended to this string to
 327           form the full kernel command line, when the system boots.
 328
 329           However, you can use the CONFIG_CMDLINE_OVERRIDE option to
 330           change this behavior.
 331
 332           In most cases, the command line (whether built-in or provided
 333           by the boot loader) should specify the device for the root
 334           file system.
 335
 336 config CMDLINE_OVERRIDE
 337         bool "Built-in command line overrides boot loader arguments"
 338         default n
 339         depends on CMDLINE_BOOL
 340         ---help---
 341           Set this option to 'Y' to have the kernel ignore the boot loader
 342           command line, and use ONLY the built-in command line.
 343
 344           This is used to work around broken boot loaders.  This should
 345           be set to 'N' under normal conditions.
 346
 347 config VMALLOC_RESERVE
 348         hex
 349         default 0x1000000
 350
 351 config HARDWALL
 352         bool "Hardwall support to allow access to user dynamic network"
 353         default y
 354
 355 config KERNEL_PL
 356         int "Processor protection level for kernel"
 357         range 1 2
 358         default 2 if TILEGX
 359         default 1 if !TILEGX
 360         ---help---
 361           Since MDE 4.2, the Tilera hypervisor runs the kernel
 362           at PL2 by default.  If running under an older hypervisor,
 363           or as a KVM guest, you must run at PL1.  (The current
 364           hypervisor may also be recompiled with "make HV_PL=2" to
 365           allow it to run a kernel at PL1, but clients running at PL1
 366           are not expected to be supported indefinitely.)
 367
 368           If you're not sure, don't change the default.
 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 source "fs/Kconfig.binfmt"
 417
 418 endmenu
 419
 420 source "net/Kconfig"
 421
 422 source "drivers/Kconfig"
 423
 424 source "fs/Kconfig"
 425
 426 source "arch/tile/Kconfig.debug"
 427
 428 source "security/Kconfig"
 429
 430 source "crypto/Kconfig"
 431
 432 source "lib/Kconfig"
 433
 434 source "arch/tile/kvm/Kconfig"