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 ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  28         select HAVE_DEBUG_STACKOVERFLOW
  29         select ARCH_WANT_FRAME_POINTERS
  30         select HAVE_CONTEXT_TRACKING
  31         select GENERIC_STRNCPY_FROM_USER
  32         select GENERIC_STRNLEN_USER
  33
  34 # FIXME: investigate whether we need/want these options.
  35 #       select HAVE_IOREMAP_PROT
  36 #       select HAVE_OPTPROBES
  37 #       select HAVE_REGS_AND_STACK_ACCESS_API
  38 #       select HAVE_HW_BREAKPOINT
  39 #       select PERF_EVENTS
  40 #       select HAVE_USER_RETURN_NOTIFIER
  41 #       config NO_BOOTMEM
  42 #       config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  43 #       config HUGETLB_PAGE_SIZE_VARIABLE
  44
  45 config MMU
  46         def_bool y
  47
  48 config GENERIC_CSUM
  49         def_bool y
  50
  51 config HAVE_ARCH_ALLOC_REMAP
  52         def_bool y
  53
  54 config HAVE_SETUP_PER_CPU_AREA
  55         def_bool y
  56
  57 config NEED_PER_CPU_PAGE_FIRST_CHUNK
  58         def_bool y
  59
  60 config SYS_SUPPORTS_HUGETLBFS
  61         def_bool y
  62
  63 # Support for additional huge page sizes besides HPAGE_SIZE.
  64 # The software support is currently only present in the TILE-Gx
  65 # hypervisor. TILEPro in any case does not support page sizes
  66 # larger than the default HPAGE_SIZE.
  67 config HUGETLB_SUPER_PAGES
  68         depends on HUGETLB_PAGE && TILEGX
  69         def_bool y
  70
  71 config GENERIC_TIME_VSYSCALL
  72         def_bool y
  73
  74 # Enable PMC if PERF_EVENTS, OPROFILE, or WATCHPOINTS are enabled.
  75 config USE_PMC
  76         bool
  77
  78 # FIXME: tilegx can implement a more efficient rwsem.
  79 config RWSEM_GENERIC_SPINLOCK
  80         def_bool y
  81
  82 # We only support gcc 4.4 and above, so this should work.
  83 config ARCH_SUPPORTS_OPTIMIZED_INLINING
  84         def_bool y
  85
  86 config ARCH_PHYS_ADDR_T_64BIT
  87         def_bool y
  88
  89 config ARCH_DMA_ADDR_T_64BIT
  90         def_bool y
  91
  92 config NEED_DMA_MAP_STATE
  93         def_bool y
  94
  95 config ARCH_HAS_DMA_SET_COHERENT_MASK
  96         bool
  97
  98 config LOCKDEP_SUPPORT
  99         def_bool y
 100
 101 config STACKTRACE_SUPPORT
 102         def_bool y
 103         select STACKTRACE
 104
 105 # We use discontigmem for now; at some point we may want to switch
 106 # to sparsemem (Tilera bug 7996).
 107 config ARCH_DISCONTIGMEM_ENABLE
 108         def_bool y
 109
 110 config ARCH_DISCONTIGMEM_DEFAULT
 111         def_bool y
 112
 113 config TRACE_IRQFLAGS_SUPPORT
 114         def_bool y
 115
 116 config STRICT_DEVMEM
 117         def_bool y
 118
 119 # SMP is required for Tilera Linux.
 120 config SMP
 121         def_bool y
 122
 123 config HVC_TILE
 124         depends on TTY
 125         select HVC_DRIVER
 126         select HVC_IRQ if TILEGX
 127         def_bool y
 128
 129 config TILEGX
 130         bool "Building for TILE-Gx (64-bit) processor"
 131         select SPARSE_IRQ
 132         select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
 133         select HAVE_FUNCTION_TRACER
 134         select HAVE_FUNCTION_GRAPH_TRACER
 135         select HAVE_DYNAMIC_FTRACE
 136         select HAVE_FTRACE_MCOUNT_RECORD
 137         select HAVE_KPROBES
 138         select HAVE_KRETPROBES
 139         select HAVE_ARCH_KGDB
 140         select ARCH_SUPPORTS_ATOMIC_RMW
 141
 142 config TILEPRO
 143         def_bool !TILEGX
 144
 145 config 64BIT
 146         def_bool TILEGX
 147
 148 config ARCH_DEFCONFIG
 149         string
 150         default "arch/tile/configs/tilepro_defconfig" if !TILEGX
 151         default "arch/tile/configs/tilegx_defconfig" if TILEGX
 152
 153 config PGTABLE_LEVELS
 154         int
 155         default 3 if 64BIT
 156         default 2
 157
 158 source "init/Kconfig"
 159
 160 source "kernel/Kconfig.freezer"
 161
 162 menu "Tilera-specific configuration"
 163
 164 config NR_CPUS
 165         int "Maximum number of tiles (2-255)"
 166         range 2 255
 167         depends on SMP
 168         default "64"
 169         ---help---
 170           Building with 64 is the recommended value, but a slightly
 171           smaller kernel memory footprint results from using a smaller
 172           value on chips with fewer tiles.
 173
 174 if TILEGX
 175
 176 choice
 177         prompt "Kernel page size"
 178         default PAGE_SIZE_64KB
 179         help
 180           This lets you select the page size of the kernel.  For best
 181           performance on memory-intensive applications, a page size of 64KB
 182           is recommended.  For workloads involving many small files, many
 183           connections, etc., it may be better to select 16KB, which uses
 184           memory more efficiently at some cost in TLB performance.
 185
 186           Note that this option is TILE-Gx specific; currently
 187           TILEPro page size is set by rebuilding the hypervisor.
 188
 189 config PAGE_SIZE_16KB
 190         bool "16KB"
 191
 192 config PAGE_SIZE_64KB
 193         bool "64KB"
 194
 195 endchoice
 196
 197 endif
 198
 199 source "kernel/Kconfig.hz"
 200
 201 config KEXEC
 202         bool "kexec system call"
 203         ---help---
 204           kexec is a system call that implements the ability to shutdown your
 205           current kernel, and to start another kernel.  It is like a reboot
 206           but it is independent of the system firmware.   It is used
 207           to implement the "mboot" Tilera booter.
 208
 209           The name comes from the similarity to the exec system call.
 210
 211 config COMPAT
 212         bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
 213         depends on TILEGX
 214         select COMPAT_BINFMT_ELF
 215         default y
 216         ---help---
 217           If enabled, the kernel will support running TILE-Gx binaries
 218           that were built with the -m32 option.
 219
 220 config SYSVIPC_COMPAT
 221         def_bool y
 222         depends on COMPAT && SYSVIPC
 223
 224 # We do not currently support disabling HIGHMEM on tilepro.
 225 config HIGHMEM
 226         bool # "Support for more than 512 MB of RAM"
 227         default !TILEGX
 228         ---help---
 229           Linux can use the full amount of RAM in the system by
 230           default.  However, the address space of TILE processors is
 231           only 4 Gigabytes large. That means that, if you have a large
 232           amount of physical memory, not all of it can be "permanently
 233           mapped" by the kernel. The physical memory that's not
 234           permanently mapped is called "high memory".
 235
 236           If you are compiling a kernel which will never run on a
 237           machine with more than 512 MB total physical RAM, answer
 238           "false" here. This will result in the kernel mapping all of
 239           physical memory into the top 1 GB of virtual memory space.
 240
 241           If unsure, say "true".
 242
 243 config ZONE_DMA
 244         def_bool y
 245
 246 config IOMMU_HELPER
 247         bool
 248
 249 config NEED_SG_DMA_LENGTH
 250         bool
 251
 252 config SWIOTLB
 253         bool
 254         default TILEGX
 255         select IOMMU_HELPER
 256         select NEED_SG_DMA_LENGTH
 257         select ARCH_HAS_DMA_SET_COHERENT_MASK
 258
 259 # We do not currently support disabling NUMA.
 260 config NUMA
 261         bool # "NUMA Memory Allocation and Scheduler Support"
 262         depends on SMP && DISCONTIGMEM
 263         default y
 264         ---help---
 265           NUMA memory allocation is required for TILE processors
 266           unless booting with memory striping enabled in the
 267           hypervisor, or with only a single memory controller.
 268           It is recommended that this option always be enabled.
 269
 270 config NODES_SHIFT
 271         int "Log base 2 of the max number of memory controllers"
 272         default 2
 273         depends on NEED_MULTIPLE_NODES
 274         ---help---
 275           By default, 2, i.e. 2^2 == 4 DDR2 controllers.
 276           In a system with more controllers, this value should be raised.
 277
 278 choice
 279         depends on !TILEGX
 280         prompt "Memory split" if EXPERT
 281         default VMSPLIT_3G
 282         ---help---
 283           Select the desired split between kernel and user memory.
 284
 285           If the address range available to the kernel is less than the
 286           physical memory installed, the remaining memory will be available
 287           as "high memory". Accessing high memory is a little more costly
 288           than low memory, as it needs to be mapped into the kernel first.
 289           Note that increasing the kernel address space limits the range
 290           available to user programs, making the address space there
 291           tighter.  Selecting anything other than the default 3G/1G split
 292           will also likely make your kernel incompatible with binary-only
 293           kernel modules.
 294
 295           If you are not absolutely sure what you are doing, leave this
 296           option alone!
 297
 298         config VMSPLIT_3_75G
 299                 bool "3.75G/0.25G user/kernel split (no kernel networking)"
 300         config VMSPLIT_3_5G
 301                 bool "3.5G/0.5G user/kernel split"
 302         config VMSPLIT_3G
 303                 bool "3G/1G user/kernel split"
 304         config VMSPLIT_2_75G
 305                 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
 306         config VMSPLIT_2_5G
 307                 bool "2.5G/1.5G user/kernel split"
 308         config VMSPLIT_2_25G
 309                 bool "2.25G/1.75G user/kernel split"
 310         config VMSPLIT_2G
 311                 bool "2G/2G user/kernel split"
 312         config VMSPLIT_1G
 313                 bool "1G/3G user/kernel split"
 314 endchoice
 315
 316 config PAGE_OFFSET
 317         hex
 318         depends on !64BIT
 319         default 0xF0000000 if VMSPLIT_3_75G
 320         default 0xE0000000 if VMSPLIT_3_5G
 321         default 0xB0000000 if VMSPLIT_2_75G
 322         default 0xA0000000 if VMSPLIT_2_5G
 323         default 0x90000000 if VMSPLIT_2_25G
 324         default 0x80000000 if VMSPLIT_2G
 325         default 0x40000000 if VMSPLIT_1G
 326         default 0xC0000000
 327
 328 source "mm/Kconfig"
 329
 330 source "kernel/Kconfig.preempt"
 331
 332 config CMDLINE_BOOL
 333         bool "Built-in kernel command line"
 334         default n
 335         ---help---
 336           Allow for specifying boot arguments to the kernel at
 337           build time.  On some systems (e.g. embedded ones), it is
 338           necessary or convenient to provide some or all of the
 339           kernel boot arguments with the kernel itself (that is,
 340           to not rely on the boot loader to provide them.)
 341
 342           To compile command line arguments into the kernel,
 343           set this option to 'Y', then fill in the
 344           the boot arguments in CONFIG_CMDLINE.
 345
 346           Systems with fully functional boot loaders (e.g. mboot, or
 347           if booting over PCI) should leave this option set to 'N'.
 348
 349 config CMDLINE
 350         string "Built-in kernel command string"
 351         depends on CMDLINE_BOOL
 352         default ""
 353         ---help---
 354           Enter arguments here that should be compiled into the kernel
 355           image and used at boot time.  If the boot loader provides a
 356           command line at boot time, it is appended to this string to
 357           form the full kernel command line, when the system boots.
 358
 359           However, you can use the CONFIG_CMDLINE_OVERRIDE option to
 360           change this behavior.
 361
 362           In most cases, the command line (whether built-in or provided
 363           by the boot loader) should specify the device for the root
 364           file system.
 365
 366 config CMDLINE_OVERRIDE
 367         bool "Built-in command line overrides boot loader arguments"
 368         default n
 369         depends on CMDLINE_BOOL
 370         ---help---
 371           Set this option to 'Y' to have the kernel ignore the boot loader
 372           command line, and use ONLY the built-in command line.
 373
 374           This is used to work around broken boot loaders.  This should
 375           be set to 'N' under normal conditions.
 376
 377 config VMALLOC_RESERVE
 378         hex
 379         default 0x2000000
 380
 381 config HARDWALL
 382         bool "Hardwall support to allow access to user dynamic network"
 383         default y
 384
 385 config KERNEL_PL
 386         int "Processor protection level for kernel"
 387         range 1 2
 388         default 2 if TILEGX
 389         default 1 if !TILEGX
 390         ---help---
 391           Since MDE 4.2, the Tilera hypervisor runs the kernel
 392           at PL2 by default.  If running under an older hypervisor,
 393           or as a KVM guest, you must run at PL1.  (The current
 394           hypervisor may also be recompiled with "make HV_PL=2" to
 395           allow it to run a kernel at PL1, but clients running at PL1
 396           are not expected to be supported indefinitely.)
 397
 398           If you're not sure, don't change the default.
 399
 400 source "arch/tile/gxio/Kconfig"
 401
 402 endmenu  # Tilera-specific configuration
 403
 404 menu "Bus options"
 405
 406 config PCI
 407         bool "PCI support"
 408         default y
 409         select PCI_DOMAINS
 410         select GENERIC_PCI_IOMAP
 411         select TILE_GXIO_TRIO if TILEGX
 412         select PCI_MSI if TILEGX
 413         ---help---
 414           Enable PCI root complex support, so PCIe endpoint devices can
 415           be attached to the Tile chip.  Many, but not all, PCI devices
 416           are supported under Tilera's root complex driver.
 417
 418 config PCI_DOMAINS
 419         bool
 420
 421 config NO_IOMEM
 422         def_bool !PCI
 423
 424 config NO_IOPORT_MAP
 425         def_bool !PCI
 426
 427 config TILE_PCI_IO
 428         bool "PCI I/O space support"
 429         default n
 430         depends on PCI
 431         depends on TILEGX
 432         ---help---
 433           Enable PCI I/O space support on TILEGx. Since the PCI I/O space
 434           is used by few modern PCIe endpoint devices, its support is disabled
 435           by default to save the TRIO PIO Region resource for other purposes.
 436
 437 source "drivers/pci/Kconfig"
 438
 439 source "drivers/pci/pcie/Kconfig"
 440
 441 config TILE_USB
 442         tristate "Tilera USB host adapter support"
 443         default y
 444         depends on USB
 445         depends on TILEGX
 446         select TILE_GXIO_USB_HOST
 447         ---help---
 448           Provides USB host adapter support for the built-in EHCI and OHCI
 449           interfaces on TILE-Gx chips.
 450
 451 source "drivers/pci/hotplug/Kconfig"
 452
 453 endmenu
 454
 455 menu "Executable file formats"
 456
 457 source "fs/Kconfig.binfmt"
 458
 459 endmenu
 460
 461 source "net/Kconfig"
 462
 463 source "drivers/Kconfig"
 464
 465 source "fs/Kconfig"
 466
 467 source "arch/tile/Kconfig.debug"
 468
 469 source "security/Kconfig"
 470
 471 source "crypto/Kconfig"
 472
 473 source "lib/Kconfig"
 474
 475 source "arch/tile/kvm/Kconfig"