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