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

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