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 HAVE_DMA_ATTRS
7 select HAVE_DMA_API_DEBUG
8 select HAVE_KVM if !TILEGX
9 select GENERIC_FIND_FIRST_BIT
10 select SYSCTL_EXCEPTION_TRACE
11 select USE_GENERIC_SMP_HELPERS
12 select CC_OPTIMIZE_FOR_SIZE
13 select HAVE_DEBUG_KMEMLEAK
14 select HAVE_GENERIC_HARDIRQS
15 select GENERIC_IRQ_PROBE
16 select GENERIC_PENDING_IRQ if SMP
17 select GENERIC_IRQ_SHOW
18 select HAVE_DEBUG_BUGVERBOSE
19 select HAVE_SYSCALL_WRAPPERS if TILEGX
20 select SYS_HYPERVISOR
21 select ARCH_HAVE_NMI_SAFE_CMPXCHG
22 select GENERIC_CLOCKEVENTS
23 select MODULES_USE_ELF_RELA
24
25# FIXME: investigate whether we need/want these options.
26# select HAVE_IOREMAP_PROT
27# select HAVE_OPTPROBES
28# select HAVE_REGS_AND_STACK_ACCESS_API
29# select HAVE_HW_BREAKPOINT
30# select PERF_EVENTS
31# select HAVE_USER_RETURN_NOTIFIER
32# config NO_BOOTMEM
33# config ARCH_SUPPORTS_DEBUG_PAGEALLOC
34# config HUGETLB_PAGE_SIZE_VARIABLE
35
36config MMU
37 def_bool y
38
39config GENERIC_CSUM
40 def_bool y
41
42config SEMAPHORE_SLEEPERS
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
65# FIXME: tilegx can implement a more efficient rwsem.
66config RWSEM_GENERIC_SPINLOCK
67 def_bool y
68
69# We have a very flat architecture from a migration point of view,
70# so save boot time by presetting this (particularly useful on tile-sim).
71config DEFAULT_MIGRATION_COST
72 int
73 default "10000000"
74
75# We only support gcc 4.4 and above, so this should work.
76config ARCH_SUPPORTS_OPTIMIZED_INLINING
77 def_bool y
78
79config ARCH_PHYS_ADDR_T_64BIT
80 def_bool y
81
82config ARCH_DMA_ADDR_T_64BIT
83 def_bool y
84
85config NEED_DMA_MAP_STATE
86 def_bool y
87
88config ARCH_HAS_DMA_SET_COHERENT_MASK
89 bool
90
91config LOCKDEP_SUPPORT
92 def_bool y
93
94config 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).
100config ARCH_DISCONTIGMEM_ENABLE
101 def_bool y
102
103config ARCH_DISCONTIGMEM_DEFAULT
104 def_bool y
105
106config TRACE_IRQFLAGS_SUPPORT
107 def_bool y
108
109config STRICT_DEVMEM
110 def_bool y
111
112# SMP is required for Tilera Linux.
113config SMP
114 def_bool y
115
116# Allow checking for compile-time determined overflow errors in
117# copy_from_user(). There are still unprovable places in the
118# generic code as of 2.6.34, so this option is not really compatible
119# with -Werror, which is more useful in general.
120config DEBUG_COPY_FROM_USER
121 def_bool n
122
123config HVC_TILE
124 select HVC_DRIVER
125 def_bool y
126
127config TILEGX
128 bool "Building with TILE-Gx (64-bit) compiler and toolchain"
129
130config TILEPRO
131 def_bool !TILEGX
132
133config 64BIT
134 def_bool TILEGX
135
136config ARCH_DEFCONFIG
137 string
138 default "arch/tile/configs/tilepro_defconfig" if !TILEGX
139 default "arch/tile/configs/tilegx_defconfig" if TILEGX
140
141source "init/Kconfig"
142
143menu "Tilera-specific configuration"
144
145config NR_CPUS
146 int "Maximum number of tiles (2-255)"
147 range 2 255
148 depends on SMP
149 default "64"
150 ---help---
151 Building with 64 is the recommended value, but a slightly
152 smaller kernel memory footprint results from using a smaller
153 value on chips with fewer tiles.
154
155if TILEGX
156
157choice
158 prompt "Kernel page size"
159 default PAGE_SIZE_64KB
160 help
161 This lets you select the page size of the kernel. For best
162 performance on memory-intensive applications, a page size of 64KB
163 is recommended. For workloads involving many small files, many
164 connections, etc., it may be better to select 16KB, which uses
165 memory more efficiently at some cost in TLB performance.
166
167 Note that this option is TILE-Gx specific; currently
168 TILEPro page size is set by rebuilding the hypervisor.
169
170config PAGE_SIZE_16KB
171 bool "16KB"
172
173config PAGE_SIZE_64KB
174 bool "64KB"
175
176endchoice
177
178endif
179
180source "kernel/Kconfig.hz"
181
182config KEXEC
183 bool "kexec system call"
184 ---help---
185 kexec is a system call that implements the ability to shutdown your
186 current kernel, and to start another kernel. It is like a reboot
187 but it is independent of the system firmware. It is used
188 to implement the "mboot" Tilera booter.
189
190 The name comes from the similarity to the exec system call.
191
192config COMPAT
193 bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
194 depends on TILEGX
195 select COMPAT_BINFMT_ELF
196 default y
197 ---help---
198 If enabled, the kernel will support running TILE-Gx binaries
199 that were built with the -m32 option.
200
201config SYSVIPC_COMPAT
202 def_bool y
203 depends on COMPAT && SYSVIPC
204
205# We do not currently support disabling HIGHMEM on tile64 and tilepro.
206config HIGHMEM
207 bool # "Support for more than 512 MB of RAM"
208 default !TILEGX
209 ---help---
210 Linux can use the full amount of RAM in the system by
211 default. However, the address space of TILE processors is
212 only 4 Gigabytes large. That means that, if you have a large
213 amount of physical memory, not all of it can be "permanently
214 mapped" by the kernel. The physical memory that's not
215 permanently mapped is called "high memory".
216
217 If you are compiling a kernel which will never run on a
218 machine with more than 512 MB total physical RAM, answer
219 "false" here. This will result in the kernel mapping all of
220 physical memory into the top 1 GB of virtual memory space.
221
222 If unsure, say "true".
223
224config ZONE_DMA
225 def_bool y
226
227config IOMMU_HELPER
228 bool
229
230config NEED_SG_DMA_LENGTH
231 bool
232
233config SWIOTLB
234 bool
235 default TILEGX
236 select IOMMU_HELPER
237 select NEED_SG_DMA_LENGTH
238 select ARCH_HAS_DMA_SET_COHERENT_MASK
239
240# We do not currently support disabling NUMA.
241config NUMA
242 bool # "NUMA Memory Allocation and Scheduler Support"
243 depends on SMP && DISCONTIGMEM
244 default y
245 ---help---
246 NUMA memory allocation is required for TILE processors
247 unless booting with memory striping enabled in the
248 hypervisor, or with only a single memory controller.
249 It is recommended that this option always be enabled.
250
251config NODES_SHIFT
252 int "Log base 2 of the max number of memory controllers"
253 default 2
254 depends on NEED_MULTIPLE_NODES
255 ---help---
256 By default, 2, i.e. 2^2 == 4 DDR2 controllers.
257 In a system with more controllers, this value should be raised.
258
259choice
260 depends on !TILEGX
261 prompt "Memory split" if EXPERT
262 default VMSPLIT_3G
263 ---help---
264 Select the desired split between kernel and user memory.
265
266 If the address range available to the kernel is less than the
267 physical memory installed, the remaining memory will be available
268 as "high memory". Accessing high memory is a little more costly
269 than low memory, as it needs to be mapped into the kernel first.
270 Note that increasing the kernel address space limits the range
271 available to user programs, making the address space there
272 tighter. Selecting anything other than the default 3G/1G split
273 will also likely make your kernel incompatible with binary-only
274 kernel modules.
275
276 If you are not absolutely sure what you are doing, leave this
277 option alone!
278
279 config VMSPLIT_3_75G
280 bool "3.75G/0.25G user/kernel split (no kernel networking)"
281 config VMSPLIT_3_5G
282 bool "3.5G/0.5G user/kernel split"
283 config VMSPLIT_3G
284 bool "3G/1G user/kernel split"
285 config VMSPLIT_2_75G
286 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
287 config VMSPLIT_2_5G
288 bool "2.5G/1.5G user/kernel split"
289 config VMSPLIT_2_25G
290 bool "2.25G/1.75G user/kernel split"
291 config VMSPLIT_2G
292 bool "2G/2G user/kernel split"
293 config VMSPLIT_1G
294 bool "1G/3G user/kernel split"
295endchoice
296
297config PAGE_OFFSET
298 hex
299 depends on !64BIT
300 default 0xF0000000 if VMSPLIT_3_75G
301 default 0xE0000000 if VMSPLIT_3_5G
302 default 0xB0000000 if VMSPLIT_2_75G
303 default 0xA0000000 if VMSPLIT_2_5G
304 default 0x90000000 if VMSPLIT_2_25G
305 default 0x80000000 if VMSPLIT_2G
306 default 0x40000000 if VMSPLIT_1G
307 default 0xC0000000
308
309source "mm/Kconfig"
310
311config CMDLINE_BOOL
312 bool "Built-in kernel command line"
313 default n
314 ---help---
315 Allow for specifying boot arguments to the kernel at
316 build time. On some systems (e.g. embedded ones), it is
317 necessary or convenient to provide some or all of the
318 kernel boot arguments with the kernel itself (that is,
319 to not rely on the boot loader to provide them.)
320
321 To compile command line arguments into the kernel,
322 set this option to 'Y', then fill in the
323 the boot arguments in CONFIG_CMDLINE.
324
325 Systems with fully functional boot loaders (e.g. mboot, or
326 if booting over PCI) should leave this option set to 'N'.
327
328config CMDLINE
329 string "Built-in kernel command string"
330 depends on CMDLINE_BOOL
331 default ""
332 ---help---
333 Enter arguments here that should be compiled into the kernel
334 image and used at boot time. If the boot loader provides a
335 command line at boot time, it is appended to this string to
336 form the full kernel command line, when the system boots.
337
338 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
339 change this behavior.
340
341 In most cases, the command line (whether built-in or provided
342 by the boot loader) should specify the device for the root
343 file system.
344
345config CMDLINE_OVERRIDE
346 bool "Built-in command line overrides boot loader arguments"
347 default n
348 depends on CMDLINE_BOOL
349 ---help---
350 Set this option to 'Y' to have the kernel ignore the boot loader
351 command line, and use ONLY the built-in command line.
352
353 This is used to work around broken boot loaders. This should
354 be set to 'N' under normal conditions.
355
356config VMALLOC_RESERVE
357 hex
358 default 0x1000000
359
360config HARDWALL
361 bool "Hardwall support to allow access to user dynamic network"
362 default y
363
364config KERNEL_PL
365 int "Processor protection level for kernel"
366 range 1 2
367 default "1"
368 ---help---
369 This setting determines the processor protection level the
370 kernel will be built to run at. Generally you should use
371 the default value here.
372
373source "arch/tile/gxio/Kconfig"
374
375endmenu # Tilera-specific configuration
376
377menu "Bus options"
378
379config PCI
380 bool "PCI support"
381 default y
382 select PCI_DOMAINS
383 select GENERIC_PCI_IOMAP
384 select TILE_GXIO_TRIO if TILEGX
385 select ARCH_SUPPORTS_MSI if TILEGX
386 select PCI_MSI if TILEGX
387 ---help---
388 Enable PCI root complex support, so PCIe endpoint devices can
389 be attached to the Tile chip. Many, but not all, PCI devices
390 are supported under Tilera's root complex driver.
391
392config PCI_DOMAINS
393 bool
394
395config NO_IOMEM
396 def_bool !PCI
397
398config NO_IOPORT
399 def_bool !PCI
400
401source "drivers/pci/Kconfig"
402
403config TILE_USB
404 tristate "Tilera USB host adapter support"
405 default y
406 depends on USB
407 depends on TILEGX
408 select TILE_GXIO_USB_HOST
409 ---help---
410 Provides USB host adapter support for the built-in EHCI and OHCI
411 interfaces on TILE-Gx chips.
412
413# USB OHCI needs the bounce pool since tilegx will often have more
414# than 4GB of memory, but we don't currently use the IOTLB to present
415# a 32-bit address to OHCI. So we need to use a bounce pool instead.
416config NEED_BOUNCE_POOL
417 def_bool USB_OHCI_HCD
418
419source "drivers/pci/hotplug/Kconfig"
420
421endmenu
422
423menu "Executable file formats"
424
425# only elf supported
426config KCORE_ELF
427 def_bool y
428 depends on PROC_FS
429
430source "fs/Kconfig.binfmt"
431
432endmenu
433
434source "net/Kconfig"
435
436source "drivers/Kconfig"
437
438source "fs/Kconfig"
439
440source "arch/tile/Kconfig.debug"
441
442source "security/Kconfig"
443
444source "crypto/Kconfig"
445
446source "lib/Kconfig"
447
448source "arch/tile/kvm/Kconfig"