tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1# For a description of the syntax of this configuration file,
2# see Documentation/kbuild/kconfig-language.txt.
3
4config 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
39config MMU
40 def_bool y
41
42config GENERIC_CSUM
43 def_bool y
44
45config HAVE_ARCH_ALLOC_REMAP
46 def_bool y
47
48config HAVE_SETUP_PER_CPU_AREA
49 def_bool y
50
51config NEED_PER_CPU_PAGE_FIRST_CHUNK
52 def_bool y
53
54config 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.
61config HUGETLB_SUPER_PAGES
62 depends on HUGETLB_PAGE && TILEGX
63 def_bool y
64
65config GENERIC_TIME_VSYSCALL
66 def_bool y
67
68# Enable PMC if PERF_EVENTS, OPROFILE, or WATCHPOINTS are enabled.
69config USE_PMC
70 bool
71
72# FIXME: tilegx can implement a more efficient rwsem.
73config RWSEM_GENERIC_SPINLOCK
74 def_bool y
75
76# We only support gcc 4.4 and above, so this should work.
77config ARCH_SUPPORTS_OPTIMIZED_INLINING
78 def_bool y
79
80config ARCH_PHYS_ADDR_T_64BIT
81 def_bool y
82
83config ARCH_DMA_ADDR_T_64BIT
84 def_bool y
85
86config NEED_DMA_MAP_STATE
87 def_bool y
88
89config ARCH_HAS_DMA_SET_COHERENT_MASK
90 bool
91
92config LOCKDEP_SUPPORT
93 def_bool y
94
95config 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).
101config ARCH_DISCONTIGMEM_ENABLE
102 def_bool y
103
104config ARCH_DISCONTIGMEM_DEFAULT
105 def_bool y
106
107config TRACE_IRQFLAGS_SUPPORT
108 def_bool y
109
110# SMP is required for Tilera Linux.
111config SMP
112 def_bool y
113
114config 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.
122config 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
136config TILEPRO
137 def_bool !TILEGX
138
139config 64BIT
140 def_bool TILEGX
141
142config ARCH_DEFCONFIG
143 string
144 default "arch/tile/configs/tilepro_defconfig" if !TILEGX
145 default "arch/tile/configs/tilegx_defconfig" if TILEGX
146
147config PGTABLE_LEVELS
148 int
149 default 3 if 64BIT
150 default 2
151
152source "init/Kconfig"
153
154source "kernel/Kconfig.freezer"
155
156menu "Tilera-specific configuration"
157
158config 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
168choice
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
181config PAGE_SIZE_4KB
182 bool "4KB" if TILEPRO
183
184config PAGE_SIZE_16KB
185 bool "16KB"
186
187config PAGE_SIZE_64KB
188 bool "64KB"
189
190endchoice
191
192source "kernel/Kconfig.hz"
193
194config 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
205config 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
214config 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
230config SYSVIPC_COMPAT
231 def_bool y
232 depends on COMPAT && SYSVIPC
233
234# We do not currently support disabling HIGHMEM on tilepro.
235config 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
253config ZONE_DMA
254 def_bool y
255
256config IOMMU_HELPER
257 bool
258
259config NEED_SG_DMA_LENGTH
260 bool
261
262config 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.
270config 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
280config 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
288choice
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"
324endchoice
325
326config 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
338source "mm/Kconfig"
339
340source "kernel/Kconfig.preempt"
341
342config 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
359config 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
376config 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
387config VMALLOC_RESERVE
388 hex
389 default 0x2000000
390
391config HARDWALL
392 bool "Hardwall support to allow access to user dynamic network"
393 default y
394
395config 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
410source "arch/tile/gxio/Kconfig"
411
412endmenu # Tilera-specific configuration
413
414menu "Bus options"
415
416config 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
428config PCI_DOMAINS
429 bool
430
431config NO_IOMEM
432 def_bool !PCI
433
434config NO_IOPORT_MAP
435 def_bool !PCI
436
437config 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
447source "drivers/pci/Kconfig"
448
449config 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
459endmenu
460
461menu "Executable file formats"
462
463source "fs/Kconfig.binfmt"
464
465endmenu
466
467source "net/Kconfig"
468
469source "drivers/Kconfig"
470
471source "fs/Kconfig"
472
473source "arch/tile/Kconfig.debug"
474
475source "security/Kconfig"
476
477source "crypto/Kconfig"
478
479source "lib/Kconfig"
480
481source "arch/tile/kvm/Kconfig"