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Linux/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 ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  7         select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
  8         select ARCH_HAS_DEVMEM_IS_ALLOWED
  9         select ARCH_HAVE_NMI_SAFE_CMPXCHG
 10         select ARCH_WANT_FRAME_POINTERS
 11         select CC_OPTIMIZE_FOR_SIZE
 12         select EDAC_SUPPORT
 13         select GENERIC_CLOCKEVENTS
 14         select GENERIC_FIND_FIRST_BIT
 15         select GENERIC_IRQ_PROBE
 16         select GENERIC_IRQ_SHOW
 17         select GENERIC_PENDING_IRQ if SMP
 18         select GENERIC_STRNCPY_FROM_USER
 19         select GENERIC_STRNLEN_USER
 20         select HAVE_ARCH_SECCOMP_FILTER
 21         select HAVE_ARCH_TRACEHOOK
 22         select HAVE_CONTEXT_TRACKING
 23         select HAVE_DEBUG_BUGVERBOSE
 24         select HAVE_DEBUG_KMEMLEAK
 25         select HAVE_DEBUG_STACKOVERFLOW
 26         select HAVE_DMA_API_DEBUG
 27         select HAVE_EXIT_THREAD
 28         select HAVE_KVM if !TILEGX
 29         select HAVE_NMI if USE_PMC
 30         select HAVE_PERF_EVENTS
 31         select HAVE_SYSCALL_TRACEPOINTS
 32         select MODULES_USE_ELF_RELA
 33         select SYSCTL_EXCEPTION_TRACE
 34         select SYS_HYPERVISOR
 35         select USER_STACKTRACE_SUPPORT
 36         select USE_PMC if PERF_EVENTS
 37         select VIRT_TO_BUS
 38 
 39 config MMU
 40         def_bool y
 41 
 42 config GENERIC_CSUM
 43         def_bool y
 44 
 45 config HAVE_ARCH_ALLOC_REMAP
 46         def_bool y
 47 
 48 config HAVE_SETUP_PER_CPU_AREA
 49         def_bool y
 50 
 51 config NEED_PER_CPU_PAGE_FIRST_CHUNK
 52         def_bool y
 53 
 54 config SYS_SUPPORTS_HUGETLBFS
 55         def_bool y
 56 
 57 # Support for additional huge page sizes besides HPAGE_SIZE.
 58 # The software support is currently only present in the TILE-Gx
 59 # hypervisor. TILEPro in any case does not support page sizes
 60 # larger than the default HPAGE_SIZE.
 61 config HUGETLB_SUPER_PAGES
 62         depends on HUGETLB_PAGE && TILEGX
 63         def_bool y
 64 
 65 config GENERIC_TIME_VSYSCALL
 66         def_bool y
 67 
 68 # Enable PMC if PERF_EVENTS, OPROFILE, or WATCHPOINTS are enabled.
 69 config USE_PMC
 70         bool
 71 
 72 # FIXME: tilegx can implement a more efficient rwsem.
 73 config RWSEM_GENERIC_SPINLOCK
 74         def_bool y
 75 
 76 # We only support gcc 4.4 and above, so this should work.
 77 config ARCH_SUPPORTS_OPTIMIZED_INLINING
 78         def_bool y
 79 
 80 config ARCH_PHYS_ADDR_T_64BIT
 81         def_bool y
 82 
 83 config ARCH_DMA_ADDR_T_64BIT
 84         def_bool y
 85 
 86 config NEED_DMA_MAP_STATE
 87         def_bool y
 88 
 89 config ARCH_HAS_DMA_SET_COHERENT_MASK
 90         bool
 91 
 92 config LOCKDEP_SUPPORT
 93         def_bool y
 94 
 95 config STACKTRACE_SUPPORT
 96         def_bool y
 97         select STACKTRACE
 98 
 99 # We use discontigmem for now; at some point we may want to switch
100 # to sparsemem (Tilera bug 7996).
101 config ARCH_DISCONTIGMEM_ENABLE
102         def_bool y
103 
104 config ARCH_DISCONTIGMEM_DEFAULT
105         def_bool y
106 
107 config TRACE_IRQFLAGS_SUPPORT
108         def_bool y
109 
110 # SMP is required for Tilera Linux.
111 config SMP
112         def_bool y
113 
114 config HVC_TILE
115         depends on TTY
116         select HVC_DRIVER
117         select HVC_IRQ if TILEGX
118         def_bool y
119 
120 # Building with ARCH=tilegx (or ARCH=tile) implies using the
121 # 64-bit TILE-Gx toolchain, so force CONFIG_TILEGX on.
122 config TILEGX
123         def_bool ARCH != "tilepro"
124         select ARCH_SUPPORTS_ATOMIC_RMW
125         select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
126         select HAVE_ARCH_JUMP_LABEL
127         select HAVE_ARCH_KGDB
128         select HAVE_DYNAMIC_FTRACE
129         select HAVE_FTRACE_MCOUNT_RECORD
130         select HAVE_FUNCTION_GRAPH_TRACER
131         select HAVE_FUNCTION_TRACER
132         select HAVE_KPROBES
133         select HAVE_KRETPROBES
134         select SPARSE_IRQ
135 
136 config TILEPRO
137         def_bool !TILEGX
138 
139 config 64BIT
140         def_bool TILEGX
141 
142 config ARCH_DEFCONFIG
143         string
144         default "arch/tile/configs/tilepro_defconfig" if !TILEGX
145         default "arch/tile/configs/tilegx_defconfig" if TILEGX
146 
147 config PGTABLE_LEVELS
148         int
149         default 3 if 64BIT
150         default 2
151 
152 source "init/Kconfig"
153 
154 source "kernel/Kconfig.freezer"
155 
156 menu "Tilera-specific configuration"
157 
158 config NR_CPUS
159         int "Maximum number of tiles (2-255)"
160         range 2 255
161         depends on SMP
162         default "64"
163         ---help---
164           Building with 64 is the recommended value, but a slightly
165           smaller kernel memory footprint results from using a smaller
166           value on chips with fewer tiles.
167 
168 choice
169         prompt "Kernel page size"
170         default PAGE_SIZE_64KB
171         help
172           This lets you select the page size of the kernel.  For best
173           performance on memory-intensive applications, a page size of 64KB
174           is recommended.  For workloads involving many small files, many
175           connections, etc., it may be better to select 16KB, which uses
176           memory more efficiently at some cost in TLB performance.
177 
178           Note that for TILEPro, you must also rebuild the hypervisor
179           with a matching page size.
180 
181 config PAGE_SIZE_4KB
182         bool "4KB" if TILEPRO
183 
184 config PAGE_SIZE_16KB
185         bool "16KB"
186 
187 config PAGE_SIZE_64KB
188         bool "64KB"
189 
190 endchoice
191 
192 source "kernel/Kconfig.hz"
193 
194 config KEXEC
195         bool "kexec system call"
196         select KEXEC_CORE
197         ---help---
198           kexec is a system call that implements the ability to shutdown your
199           current kernel, and to start another kernel.  It is like a reboot
200           but it is independent of the system firmware.   It is used
201           to implement the "mboot" Tilera booter.
202 
203           The name comes from the similarity to the exec system call.
204 
205 config COMPAT
206         bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
207         depends on TILEGX
208         select COMPAT_BINFMT_ELF
209         default y
210         ---help---
211           If enabled, the kernel will support running TILE-Gx binaries
212           that were built with the -m32 option.
213 
214 config SECCOMP
215         bool "Enable seccomp to safely compute untrusted bytecode"
216         depends on PROC_FS
217         help
218           This kernel feature is useful for number crunching applications
219           that may need to compute untrusted bytecode during their
220           execution. By using pipes or other transports made available to
221           the process as file descriptors supporting the read/write
222           syscalls, it's possible to isolate those applications in
223           their own address space using seccomp. Once seccomp is
224           enabled via prctl, it cannot be disabled and the task is only
225           allowed to execute a few safe syscalls defined by each seccomp
226           mode.
227 
228           If unsure, say N.
229 
230 config SYSVIPC_COMPAT
231         def_bool y
232         depends on COMPAT && SYSVIPC
233 
234 # We do not currently support disabling HIGHMEM on tilepro.
235 config HIGHMEM
236         bool # "Support for more than 512 MB of RAM"
237         default !TILEGX
238         ---help---
239           Linux can use the full amount of RAM in the system by
240           default.  However, the address space of TILE processors is
241           only 4 Gigabytes large. That means that, if you have a large
242           amount of physical memory, not all of it can be "permanently
243           mapped" by the kernel. The physical memory that's not
244           permanently mapped is called "high memory".
245 
246           If you are compiling a kernel which will never run on a
247           machine with more than 512 MB total physical RAM, answer
248           "false" here. This will result in the kernel mapping all of
249           physical memory into the top 1 GB of virtual memory space.
250 
251           If unsure, say "true".
252 
253 config ZONE_DMA
254         def_bool y
255 
256 config IOMMU_HELPER
257         bool
258 
259 config NEED_SG_DMA_LENGTH
260         bool
261 
262 config SWIOTLB
263         bool
264         default TILEGX
265         select IOMMU_HELPER
266         select NEED_SG_DMA_LENGTH
267         select ARCH_HAS_DMA_SET_COHERENT_MASK
268 
269 # We do not currently support disabling NUMA.
270 config NUMA
271         bool # "NUMA Memory Allocation and Scheduler Support"
272         depends on SMP && DISCONTIGMEM
273         default y
274         ---help---
275           NUMA memory allocation is required for TILE processors
276           unless booting with memory striping enabled in the
277           hypervisor, or with only a single memory controller.
278           It is recommended that this option always be enabled.
279 
280 config NODES_SHIFT
281         int "Log base 2 of the max number of memory controllers"
282         default 2
283         depends on NEED_MULTIPLE_NODES
284         ---help---
285           By default, 2, i.e. 2^2 == 4 DDR2 controllers.
286           In a system with more controllers, this value should be raised.
287 
288 choice
289         depends on !TILEGX
290         prompt "Memory split" if EXPERT
291         default VMSPLIT_3G
292         ---help---
293           Select the desired split between kernel and user memory.
294 
295           If the address range available to the kernel is less than the
296           physical memory installed, the remaining memory will be available
297           as "high memory". Accessing high memory is a little more costly
298           than low memory, as it needs to be mapped into the kernel first.
299           Note that increasing the kernel address space limits the range
300           available to user programs, making the address space there
301           tighter.  Selecting anything other than the default 3G/1G split
302           will also likely make your kernel incompatible with binary-only
303           kernel modules.
304 
305           If you are not absolutely sure what you are doing, leave this
306           option alone!
307 
308         config VMSPLIT_3_75G
309                 bool "3.75G/0.25G user/kernel split (no kernel networking)"
310         config VMSPLIT_3_5G
311                 bool "3.5G/0.5G user/kernel split"
312         config VMSPLIT_3G
313                 bool "3G/1G user/kernel split"
314         config VMSPLIT_2_75G
315                 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
316         config VMSPLIT_2_5G
317                 bool "2.5G/1.5G user/kernel split"
318         config VMSPLIT_2_25G
319                 bool "2.25G/1.75G user/kernel split"
320         config VMSPLIT_2G
321                 bool "2G/2G user/kernel split"
322         config VMSPLIT_1G
323                 bool "1G/3G user/kernel split"
324 endchoice
325 
326 config PAGE_OFFSET
327         hex
328         depends on !64BIT
329         default 0xF0000000 if VMSPLIT_3_75G
330         default 0xE0000000 if VMSPLIT_3_5G
331         default 0xB0000000 if VMSPLIT_2_75G
332         default 0xA0000000 if VMSPLIT_2_5G
333         default 0x90000000 if VMSPLIT_2_25G
334         default 0x80000000 if VMSPLIT_2G
335         default 0x40000000 if VMSPLIT_1G
336         default 0xC0000000
337 
338 source "mm/Kconfig"
339 
340 source "kernel/Kconfig.preempt"
341 
342 config CMDLINE_BOOL
343         bool "Built-in kernel command line"
344         default n
345         ---help---
346           Allow for specifying boot arguments to the kernel at
347           build time.  On some systems (e.g. embedded ones), it is
348           necessary or convenient to provide some or all of the
349           kernel boot arguments with the kernel itself (that is,
350           to not rely on the boot loader to provide them.)
351 
352           To compile command line arguments into the kernel,
353           set this option to 'Y', then fill in the
354           the boot arguments in CONFIG_CMDLINE.
355 
356           Systems with fully functional boot loaders (e.g. mboot, or
357           if booting over PCI) should leave this option set to 'N'.
358 
359 config CMDLINE
360         string "Built-in kernel command string"
361         depends on CMDLINE_BOOL
362         default ""
363         ---help---
364           Enter arguments here that should be compiled into the kernel
365           image and used at boot time.  If the boot loader provides a
366           command line at boot time, it is appended to this string to
367           form the full kernel command line, when the system boots.
368 
369           However, you can use the CONFIG_CMDLINE_OVERRIDE option to
370           change this behavior.
371 
372           In most cases, the command line (whether built-in or provided
373           by the boot loader) should specify the device for the root
374           file system.
375 
376 config CMDLINE_OVERRIDE
377         bool "Built-in command line overrides boot loader arguments"
378         default n
379         depends on CMDLINE_BOOL
380         ---help---
381           Set this option to 'Y' to have the kernel ignore the boot loader
382           command line, and use ONLY the built-in command line.
383 
384           This is used to work around broken boot loaders.  This should
385           be set to 'N' under normal conditions.
386 
387 config VMALLOC_RESERVE
388         hex
389         default 0x2000000
390 
391 config HARDWALL
392         bool "Hardwall support to allow access to user dynamic network"
393         default y
394 
395 config KERNEL_PL
396         int "Processor protection level for kernel"
397         range 1 2
398         default 2 if TILEGX
399         default 1 if !TILEGX
400         ---help---
401           Since MDE 4.2, the Tilera hypervisor runs the kernel
402           at PL2 by default.  If running under an older hypervisor,
403           or as a KVM guest, you must run at PL1.  (The current
404           hypervisor may also be recompiled with "make HV_PL=2" to
405           allow it to run a kernel at PL1, but clients running at PL1
406           are not expected to be supported indefinitely.)
407 
408           If you're not sure, don't change the default.
409 
410 source "arch/tile/gxio/Kconfig"
411 
412 endmenu  # Tilera-specific configuration
413 
414 menu "Bus options"
415 
416 config PCI
417         bool "PCI support"
418         default y
419         select PCI_DOMAINS
420         select GENERIC_PCI_IOMAP
421         select TILE_GXIO_TRIO if TILEGX
422         select PCI_MSI if TILEGX
423         ---help---
424           Enable PCI root complex support, so PCIe endpoint devices can
425           be attached to the Tile chip.  Many, but not all, PCI devices
426           are supported under Tilera's root complex driver.
427 
428 config PCI_DOMAINS
429         bool
430 
431 config NO_IOMEM
432         def_bool !PCI
433 
434 config NO_IOPORT_MAP
435         def_bool !PCI
436 
437 config TILE_PCI_IO
438         bool "PCI I/O space support"
439         default n
440         depends on PCI
441         depends on TILEGX
442         ---help---
443           Enable PCI I/O space support on TILEGx. Since the PCI I/O space
444           is used by few modern PCIe endpoint devices, its support is disabled
445           by default to save the TRIO PIO Region resource for other purposes.
446 
447 source "drivers/pci/Kconfig"
448 
449 config TILE_USB
450         tristate "Tilera USB host adapter support"
451         default y
452         depends on USB
453         depends on TILEGX
454         select TILE_GXIO_USB_HOST
455         ---help---
456           Provides USB host adapter support for the built-in EHCI and OHCI
457           interfaces on TILE-Gx chips.
458 
459 endmenu
460 
461 menu "Executable file formats"
462 
463 source "fs/Kconfig.binfmt"
464 
465 endmenu
466 
467 source "net/Kconfig"
468 
469 source "drivers/Kconfig"
470 
471 source "fs/Kconfig"
472 
473 source "arch/tile/Kconfig.debug"
474 
475 source "security/Kconfig"
476 
477 source "crypto/Kconfig"
478 
479 source "lib/Kconfig"
480 
481 source "arch/tile/kvm/Kconfig"

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