arch/tile/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0
   2 # For a description of the syntax of this configuration file,
   3 # see Documentation/kbuild/kconfig-language.txt.
   4
   5 config TILE
   6         def_bool y
   7         select ARCH_HAS_DEVMEM_IS_ALLOWED
   8         select ARCH_HAVE_NMI_SAFE_CMPXCHG
   9         select ARCH_WANT_FRAME_POINTERS
  10         select CC_OPTIMIZE_FOR_SIZE
  11         select EDAC_SUPPORT
  12         select GENERIC_CLOCKEVENTS
  13         select GENERIC_FIND_FIRST_BIT
  14         select GENERIC_IRQ_PROBE
  15         select GENERIC_IRQ_SHOW
  16         select GENERIC_PENDING_IRQ if SMP
  17         select GENERIC_STRNCPY_FROM_USER
  18         select GENERIC_STRNLEN_USER
  19         select HAVE_ARCH_SECCOMP_FILTER
  20         select HAVE_ARCH_TRACEHOOK
  21         select HAVE_CONTEXT_TRACKING
  22         select HAVE_DEBUG_BUGVERBOSE
  23         select HAVE_DEBUG_KMEMLEAK
  24         select HAVE_DEBUG_STACKOVERFLOW
  25         select HAVE_DMA_API_DEBUG
  26         select HAVE_EXIT_THREAD
  27         select HAVE_KVM if !TILEGX
  28         select HAVE_NMI if USE_PMC
  29         select HAVE_PERF_EVENTS
  30         select HAVE_SYSCALL_TRACEPOINTS
  31         select MODULES_USE_ELF_RELA
  32         select SYSCTL_EXCEPTION_TRACE
  33         select SYS_HYPERVISOR
  34         select USER_STACKTRACE_SUPPORT
  35         select USE_PMC if PERF_EVENTS
  36         select VIRT_TO_BUS
  37
  38 config MMU
  39         def_bool y
  40
  41 config GENERIC_CSUM
  42         def_bool y
  43
  44 config HAVE_ARCH_ALLOC_REMAP
  45         def_bool y
  46
  47 config HAVE_SETUP_PER_CPU_AREA
  48         def_bool y
  49
  50 config NEED_PER_CPU_PAGE_FIRST_CHUNK
  51         def_bool y
  52
  53 config SYS_SUPPORTS_HUGETLBFS
  54         def_bool y
  55
  56 # Support for additional huge page sizes besides HPAGE_SIZE.
  57 # The software support is currently only present in the TILE-Gx
  58 # hypervisor. TILEPro in any case does not support page sizes
  59 # larger than the default HPAGE_SIZE.
  60 config HUGETLB_SUPER_PAGES
  61         depends on HUGETLB_PAGE && TILEGX
  62         def_bool y
  63
  64 config GENERIC_TIME_VSYSCALL
  65         def_bool y
  66
  67 # Enable PMC if PERF_EVENTS, OPROFILE, or WATCHPOINTS are enabled.
  68 config USE_PMC
  69         bool
  70
  71 # FIXME: tilegx can implement a more efficient rwsem.
  72 config RWSEM_GENERIC_SPINLOCK
  73         def_bool y
  74
  75 # We only support gcc 4.4 and above, so this should work.
  76 config ARCH_SUPPORTS_OPTIMIZED_INLINING
  77         def_bool y
  78
  79 config ARCH_PHYS_ADDR_T_64BIT
  80         def_bool y
  81
  82 config ARCH_DMA_ADDR_T_64BIT
  83         def_bool y
  84
  85 config NEED_DMA_MAP_STATE
  86         def_bool y
  87
  88 config ARCH_HAS_DMA_SET_COHERENT_MASK
  89         bool
  90
  91 config LOCKDEP_SUPPORT
  92         def_bool y
  93
  94 config STACKTRACE_SUPPORT
  95         def_bool y
  96         select STACKTRACE
  97
  98 # We use discontigmem for now; at some point we may want to switch
  99 # to sparsemem (Tilera bug 7996).
 100 config ARCH_DISCONTIGMEM_ENABLE
 101         def_bool y
 102
 103 config ARCH_DISCONTIGMEM_DEFAULT
 104         def_bool y
 105
 106 config TRACE_IRQFLAGS_SUPPORT
 107         def_bool y
 108
 109 # SMP is required for Tilera Linux.
 110 config SMP
 111         def_bool y
 112
 113 config HVC_TILE
 114         depends on TTY
 115         select HVC_DRIVER
 116         select HVC_IRQ if TILEGX
 117         def_bool y
 118
 119 # Building with ARCH=tilegx (or ARCH=tile) implies using the
 120 # 64-bit TILE-Gx toolchain, so force CONFIG_TILEGX on.
 121 config TILEGX
 122         def_bool ARCH != "tilepro"
 123         select ARCH_SUPPORTS_ATOMIC_RMW
 124         select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
 125         select HAVE_ARCH_JUMP_LABEL
 126         select HAVE_ARCH_KGDB
 127         select HAVE_DYNAMIC_FTRACE
 128         select HAVE_FTRACE_MCOUNT_RECORD
 129         select HAVE_FUNCTION_GRAPH_TRACER
 130         select HAVE_FUNCTION_TRACER
 131         select HAVE_KPROBES
 132         select HAVE_KRETPROBES
 133         select SPARSE_IRQ
 134
 135 config TILEPRO
 136         def_bool !TILEGX
 137
 138 config 64BIT
 139         def_bool TILEGX
 140
 141 config ARCH_DEFCONFIG
 142         string
 143         default "arch/tile/configs/tilepro_defconfig" if !TILEGX
 144         default "arch/tile/configs/tilegx_defconfig" if TILEGX
 145
 146 config PGTABLE_LEVELS
 147         int
 148         default 3 if 64BIT
 149         default 2
 150
 151 source "init/Kconfig"
 152
 153 source "kernel/Kconfig.freezer"
 154
 155 menu "Tilera-specific configuration"
 156
 157 config NR_CPUS
 158         int "Maximum number of tiles (2-255)"
 159         range 2 255
 160         depends on SMP
 161         default "64"
 162         ---help---
 163           Building with 64 is the recommended value, but a slightly
 164           smaller kernel memory footprint results from using a smaller
 165           value on chips with fewer tiles.
 166
 167 choice
 168         prompt "Kernel page size"
 169         default PAGE_SIZE_64KB
 170         help
 171           This lets you select the page size of the kernel.  For best
 172           performance on memory-intensive applications, a page size of 64KB
 173           is recommended.  For workloads involving many small files, many
 174           connections, etc., it may be better to select 16KB, which uses
 175           memory more efficiently at some cost in TLB performance.
 176
 177           Note that for TILEPro, you must also rebuild the hypervisor
 178           with a matching page size.
 179
 180 config PAGE_SIZE_4KB
 181         bool "4KB" if TILEPRO
 182
 183 config PAGE_SIZE_16KB
 184         bool "16KB"
 185
 186 config PAGE_SIZE_64KB
 187         bool "64KB"
 188
 189 endchoice
 190
 191 source "kernel/Kconfig.hz"
 192
 193 config KEXEC
 194         bool "kexec system call"
 195         select KEXEC_CORE
 196         ---help---
 197           kexec is a system call that implements the ability to shutdown your
 198           current kernel, and to start another kernel.  It is like a reboot
 199           but it is independent of the system firmware.   It is used
 200           to implement the "mboot" Tilera booter.
 201
 202           The name comes from the similarity to the exec system call.
 203
 204 config COMPAT
 205         bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
 206         depends on TILEGX
 207         select COMPAT_BINFMT_ELF
 208         default y
 209         ---help---
 210           If enabled, the kernel will support running TILE-Gx binaries
 211           that were built with the -m32 option.
 212
 213 config SECCOMP
 214         bool "Enable seccomp to safely compute untrusted bytecode"
 215         depends on PROC_FS
 216         help
 217           This kernel feature is useful for number crunching applications
 218           that may need to compute untrusted bytecode during their
 219           execution. By using pipes or other transports made available to
 220           the process as file descriptors supporting the read/write
 221           syscalls, it's possible to isolate those applications in
 222           their own address space using seccomp. Once seccomp is
 223           enabled via prctl, it cannot be disabled and the task is only
 224           allowed to execute a few safe syscalls defined by each seccomp
 225           mode.
 226
 227           If unsure, say N.
 228
 229 config SYSVIPC_COMPAT
 230         def_bool y
 231         depends on COMPAT && SYSVIPC
 232
 233 # We do not currently support disabling HIGHMEM on tilepro.
 234 config HIGHMEM
 235         bool # "Support for more than 512 MB of RAM"
 236         default !TILEGX
 237         ---help---
 238           Linux can use the full amount of RAM in the system by
 239           default.  However, the address space of TILE processors is
 240           only 4 Gigabytes large. That means that, if you have a large
 241           amount of physical memory, not all of it can be "permanently
 242           mapped" by the kernel. The physical memory that's not
 243           permanently mapped is called "high memory".
 244
 245           If you are compiling a kernel which will never run on a
 246           machine with more than 512 MB total physical RAM, answer
 247           "false" here. This will result in the kernel mapping all of
 248           physical memory into the top 1 GB of virtual memory space.
 249
 250           If unsure, say "true".
 251
 252 config ZONE_DMA
 253         def_bool y
 254
 255 config IOMMU_HELPER
 256         bool
 257
 258 config NEED_SG_DMA_LENGTH
 259         bool
 260
 261 config SWIOTLB
 262         bool
 263         default TILEGX
 264         select IOMMU_HELPER
 265         select NEED_SG_DMA_LENGTH
 266         select ARCH_HAS_DMA_SET_COHERENT_MASK
 267
 268 # We do not currently support disabling NUMA.
 269 config NUMA
 270         bool # "NUMA Memory Allocation and Scheduler Support"
 271         depends on SMP && DISCONTIGMEM
 272         default y
 273         ---help---
 274           NUMA memory allocation is required for TILE processors
 275           unless booting with memory striping enabled in the
 276           hypervisor, or with only a single memory controller.
 277           It is recommended that this option always be enabled.
 278
 279 config NODES_SHIFT
 280         int "Log base 2 of the max number of memory controllers"
 281         default 2
 282         depends on NEED_MULTIPLE_NODES
 283         ---help---
 284           By default, 2, i.e. 2^2 == 4 DDR2 controllers.
 285           In a system with more controllers, this value should be raised.
 286
 287 choice
 288         depends on !TILEGX
 289         prompt "Memory split" if EXPERT
 290         default VMSPLIT_3G
 291         ---help---
 292           Select the desired split between kernel and user memory.
 293
 294           If the address range available to the kernel is less than the
 295           physical memory installed, the remaining memory will be available
 296           as "high memory". Accessing high memory is a little more costly
 297           than low memory, as it needs to be mapped into the kernel first.
 298           Note that increasing the kernel address space limits the range
 299           available to user programs, making the address space there
 300           tighter.  Selecting anything other than the default 3G/1G split
 301           will also likely make your kernel incompatible with binary-only
 302           kernel modules.
 303
 304           If you are not absolutely sure what you are doing, leave this
 305           option alone!
 306
 307         config VMSPLIT_3_75G
 308                 bool "3.75G/0.25G user/kernel split (no kernel networking)"
 309         config VMSPLIT_3_5G
 310                 bool "3.5G/0.5G user/kernel split"
 311         config VMSPLIT_3G
 312                 bool "3G/1G user/kernel split"
 313         config VMSPLIT_2_75G
 314                 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
 315         config VMSPLIT_2_5G
 316                 bool "2.5G/1.5G user/kernel split"
 317         config VMSPLIT_2_25G
 318                 bool "2.25G/1.75G user/kernel split"
 319         config VMSPLIT_2G
 320                 bool "2G/2G user/kernel split"
 321         config VMSPLIT_1G
 322                 bool "1G/3G user/kernel split"
 323 endchoice
 324
 325 config PAGE_OFFSET
 326         hex
 327         depends on !64BIT
 328         default 0xF0000000 if VMSPLIT_3_75G
 329         default 0xE0000000 if VMSPLIT_3_5G
 330         default 0xB0000000 if VMSPLIT_2_75G
 331         default 0xA0000000 if VMSPLIT_2_5G
 332         default 0x90000000 if VMSPLIT_2_25G
 333         default 0x80000000 if VMSPLIT_2G
 334         default 0x40000000 if VMSPLIT_1G
 335         default 0xC0000000
 336
 337 source "mm/Kconfig"
 338
 339 source "kernel/Kconfig.preempt"
 340
 341 config CMDLINE_BOOL
 342         bool "Built-in kernel command line"
 343         default n
 344         ---help---
 345           Allow for specifying boot arguments to the kernel at
 346           build time.  On some systems (e.g. embedded ones), it is
 347           necessary or convenient to provide some or all of the
 348           kernel boot arguments with the kernel itself (that is,
 349           to not rely on the boot loader to provide them.)
 350
 351           To compile command line arguments into the kernel,
 352           set this option to 'Y', then fill in the
 353           the boot arguments in CONFIG_CMDLINE.
 354
 355           Systems with fully functional boot loaders (e.g. mboot, or
 356           if booting over PCI) should leave this option set to 'N'.
 357
 358 config CMDLINE
 359         string "Built-in kernel command string"
 360         depends on CMDLINE_BOOL
 361         default ""
 362         ---help---
 363           Enter arguments here that should be compiled into the kernel
 364           image and used at boot time.  If the boot loader provides a
 365           command line at boot time, it is appended to this string to
 366           form the full kernel command line, when the system boots.
 367
 368           However, you can use the CONFIG_CMDLINE_OVERRIDE option to
 369           change this behavior.
 370
 371           In most cases, the command line (whether built-in or provided
 372           by the boot loader) should specify the device for the root
 373           file system.
 374
 375 config CMDLINE_OVERRIDE
 376         bool "Built-in command line overrides boot loader arguments"
 377         default n
 378         depends on CMDLINE_BOOL
 379         ---help---
 380           Set this option to 'Y' to have the kernel ignore the boot loader
 381           command line, and use ONLY the built-in command line.
 382
 383           This is used to work around broken boot loaders.  This should
 384           be set to 'N' under normal conditions.
 385
 386 config VMALLOC_RESERVE
 387         hex
 388         default 0x2000000
 389
 390 config HARDWALL
 391         bool "Hardwall support to allow access to user dynamic network"
 392         default y
 393
 394 config KERNEL_PL
 395         int "Processor protection level for kernel"
 396         range 1 2
 397         default 2 if TILEGX
 398         default 1 if !TILEGX
 399         ---help---
 400           Since MDE 4.2, the Tilera hypervisor runs the kernel
 401           at PL2 by default.  If running under an older hypervisor,
 402           or as a KVM guest, you must run at PL1.  (The current
 403           hypervisor may also be recompiled with "make HV_PL=2" to
 404           allow it to run a kernel at PL1, but clients running at PL1
 405           are not expected to be supported indefinitely.)
 406
 407           If you're not sure, don't change the default.
 408
 409 source "arch/tile/gxio/Kconfig"
 410
 411 endmenu  # Tilera-specific configuration
 412
 413 menu "Bus options"
 414
 415 config PCI
 416         bool "PCI support"
 417         default y
 418         select PCI_DOMAINS
 419         select GENERIC_PCI_IOMAP
 420         select TILE_GXIO_TRIO if TILEGX
 421         select PCI_MSI if TILEGX
 422         ---help---
 423           Enable PCI root complex support, so PCIe endpoint devices can
 424           be attached to the Tile chip.  Many, but not all, PCI devices
 425           are supported under Tilera's root complex driver.
 426
 427 config PCI_DOMAINS
 428         bool
 429
 430 config NO_IOMEM
 431         def_bool !PCI
 432
 433 config NO_IOPORT_MAP
 434         def_bool !PCI
 435
 436 config TILE_PCI_IO
 437         bool "PCI I/O space support"
 438         default n
 439         depends on PCI
 440         depends on TILEGX
 441         ---help---
 442           Enable PCI I/O space support on TILEGx. Since the PCI I/O space
 443           is used by few modern PCIe endpoint devices, its support is disabled
 444           by default to save the TRIO PIO Region resource for other purposes.
 445
 446 source "drivers/pci/Kconfig"
 447
 448 config TILE_USB
 449         tristate "Tilera USB host adapter support"
 450         default y
 451         depends on USB
 452         depends on TILEGX
 453         select TILE_GXIO_USB_HOST
 454         ---help---
 455           Provides USB host adapter support for the built-in EHCI and OHCI
 456           interfaces on TILE-Gx chips.
 457
 458 endmenu
 459
 460 menu "Executable file formats"
 461
 462 source "fs/Kconfig.binfmt"
 463
 464 endmenu
 465
 466 source "net/Kconfig"
 467
 468 source "drivers/Kconfig"
 469
 470 source "fs/Kconfig"
 471
 472 source "arch/tile/Kconfig.debug"
 473
 474 source "security/Kconfig"
 475
 476 source "crypto/Kconfig"
 477
 478 source "lib/Kconfig"
 479
 480 source "arch/tile/kvm/Kconfig"