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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_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"

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