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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 VIRT_TO_BUS
20 select SYS_HYPERVISOR
21 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
22 select ARCH_HAVE_NMI_SAFE_CMPXCHG
23 select GENERIC_CLOCKEVENTS
24 select MODULES_USE_ELF_RELA
25 select HAVE_ARCH_TRACEHOOK
26 select HAVE_SYSCALL_TRACEPOINTS
27 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
28 select HAVE_DEBUG_STACKOVERFLOW
29
30# FIXME: investigate whether we need/want these options.
31# select HAVE_IOREMAP_PROT
32# select HAVE_OPTPROBES
33# select HAVE_REGS_AND_STACK_ACCESS_API
34# select HAVE_HW_BREAKPOINT
35# select PERF_EVENTS
36# select HAVE_USER_RETURN_NOTIFIER
37# config NO_BOOTMEM
38# config ARCH_SUPPORTS_DEBUG_PAGEALLOC
39# config HUGETLB_PAGE_SIZE_VARIABLE
40
41config MMU
42 def_bool y
43
44config GENERIC_CSUM
45 def_bool y
46
47config HAVE_ARCH_ALLOC_REMAP
48 def_bool y
49
50config HAVE_SETUP_PER_CPU_AREA
51 def_bool y
52
53config NEED_PER_CPU_PAGE_FIRST_CHUNK
54 def_bool y
55
56config SYS_SUPPORTS_HUGETLBFS
57 def_bool y
58
59# Support for additional huge page sizes besides HPAGE_SIZE.
60# The software support is currently only present in the TILE-Gx
61# hypervisor. TILEPro in any case does not support page sizes
62# larger than the default HPAGE_SIZE.
63config HUGETLB_SUPER_PAGES
64 depends on HUGETLB_PAGE && TILEGX
65 def_bool y
66
67# FIXME: tilegx can implement a more efficient rwsem.
68config RWSEM_GENERIC_SPINLOCK
69 def_bool y
70
71# We only support gcc 4.4 and above, so this should work.
72config ARCH_SUPPORTS_OPTIMIZED_INLINING
73 def_bool y
74
75config ARCH_PHYS_ADDR_T_64BIT
76 def_bool y
77
78config ARCH_DMA_ADDR_T_64BIT
79 def_bool y
80
81config NEED_DMA_MAP_STATE
82 def_bool y
83
84config ARCH_HAS_DMA_SET_COHERENT_MASK
85 bool
86
87config LOCKDEP_SUPPORT
88 def_bool y
89
90config STACKTRACE_SUPPORT
91 def_bool y
92 select STACKTRACE
93
94# We use discontigmem for now; at some point we may want to switch
95# to sparsemem (Tilera bug 7996).
96config ARCH_DISCONTIGMEM_ENABLE
97 def_bool y
98
99config ARCH_DISCONTIGMEM_DEFAULT
100 def_bool y
101
102config TRACE_IRQFLAGS_SUPPORT
103 def_bool y
104
105config STRICT_DEVMEM
106 def_bool y
107
108# SMP is required for Tilera Linux.
109config SMP
110 def_bool y
111
112config HVC_TILE
113 depends on TTY
114 select HVC_DRIVER
115 def_bool y
116
117config TILEGX
118 bool "Building with TILE-Gx (64-bit) compiler and toolchain"
119
120config TILEPRO
121 def_bool !TILEGX
122
123config 64BIT
124 def_bool TILEGX
125
126config ARCH_DEFCONFIG
127 string
128 default "arch/tile/configs/tilepro_defconfig" if !TILEGX
129 default "arch/tile/configs/tilegx_defconfig" if TILEGX
130
131source "init/Kconfig"
132
133source "kernel/Kconfig.freezer"
134
135menu "Tilera-specific configuration"
136
137config NR_CPUS
138 int "Maximum number of tiles (2-255)"
139 range 2 255
140 depends on SMP
141 default "64"
142 ---help---
143 Building with 64 is the recommended value, but a slightly
144 smaller kernel memory footprint results from using a smaller
145 value on chips with fewer tiles.
146
147if TILEGX
148
149choice
150 prompt "Kernel page size"
151 default PAGE_SIZE_64KB
152 help
153 This lets you select the page size of the kernel. For best
154 performance on memory-intensive applications, a page size of 64KB
155 is recommended. For workloads involving many small files, many
156 connections, etc., it may be better to select 16KB, which uses
157 memory more efficiently at some cost in TLB performance.
158
159 Note that this option is TILE-Gx specific; currently
160 TILEPro page size is set by rebuilding the hypervisor.
161
162config PAGE_SIZE_16KB
163 bool "16KB"
164
165config PAGE_SIZE_64KB
166 bool "64KB"
167
168endchoice
169
170endif
171
172source "kernel/Kconfig.hz"
173
174config KEXEC
175 bool "kexec system call"
176 ---help---
177 kexec is a system call that implements the ability to shutdown your
178 current kernel, and to start another kernel. It is like a reboot
179 but it is independent of the system firmware. It is used
180 to implement the "mboot" Tilera booter.
181
182 The name comes from the similarity to the exec system call.
183
184config COMPAT
185 bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
186 depends on TILEGX
187 select COMPAT_BINFMT_ELF
188 default y
189 ---help---
190 If enabled, the kernel will support running TILE-Gx binaries
191 that were built with the -m32 option.
192
193config SYSVIPC_COMPAT
194 def_bool y
195 depends on COMPAT && SYSVIPC
196
197# We do not currently support disabling HIGHMEM on tile64 and tilepro.
198config HIGHMEM
199 bool # "Support for more than 512 MB of RAM"
200 default !TILEGX
201 ---help---
202 Linux can use the full amount of RAM in the system by
203 default. However, the address space of TILE processors is
204 only 4 Gigabytes large. That means that, if you have a large
205 amount of physical memory, not all of it can be "permanently
206 mapped" by the kernel. The physical memory that's not
207 permanently mapped is called "high memory".
208
209 If you are compiling a kernel which will never run on a
210 machine with more than 512 MB total physical RAM, answer
211 "false" here. This will result in the kernel mapping all of
212 physical memory into the top 1 GB of virtual memory space.
213
214 If unsure, say "true".
215
216config ZONE_DMA
217 def_bool y
218
219config IOMMU_HELPER
220 bool
221
222config NEED_SG_DMA_LENGTH
223 bool
224
225config SWIOTLB
226 bool
227 default TILEGX
228 select IOMMU_HELPER
229 select NEED_SG_DMA_LENGTH
230 select ARCH_HAS_DMA_SET_COHERENT_MASK
231
232# We do not currently support disabling NUMA.
233config NUMA
234 bool # "NUMA Memory Allocation and Scheduler Support"
235 depends on SMP && DISCONTIGMEM
236 default y
237 ---help---
238 NUMA memory allocation is required for TILE processors
239 unless booting with memory striping enabled in the
240 hypervisor, or with only a single memory controller.
241 It is recommended that this option always be enabled.
242
243config NODES_SHIFT
244 int "Log base 2 of the max number of memory controllers"
245 default 2
246 depends on NEED_MULTIPLE_NODES
247 ---help---
248 By default, 2, i.e. 2^2 == 4 DDR2 controllers.
249 In a system with more controllers, this value should be raised.
250
251choice
252 depends on !TILEGX
253 prompt "Memory split" if EXPERT
254 default VMSPLIT_3G
255 ---help---
256 Select the desired split between kernel and user memory.
257
258 If the address range available to the kernel is less than the
259 physical memory installed, the remaining memory will be available
260 as "high memory". Accessing high memory is a little more costly
261 than low memory, as it needs to be mapped into the kernel first.
262 Note that increasing the kernel address space limits the range
263 available to user programs, making the address space there
264 tighter. Selecting anything other than the default 3G/1G split
265 will also likely make your kernel incompatible with binary-only
266 kernel modules.
267
268 If you are not absolutely sure what you are doing, leave this
269 option alone!
270
271 config VMSPLIT_3_75G
272 bool "3.75G/0.25G user/kernel split (no kernel networking)"
273 config VMSPLIT_3_5G
274 bool "3.5G/0.5G user/kernel split"
275 config VMSPLIT_3G
276 bool "3G/1G user/kernel split"
277 config VMSPLIT_2_75G
278 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
279 config VMSPLIT_2_5G
280 bool "2.5G/1.5G user/kernel split"
281 config VMSPLIT_2_25G
282 bool "2.25G/1.75G user/kernel split"
283 config VMSPLIT_2G
284 bool "2G/2G user/kernel split"
285 config VMSPLIT_1G
286 bool "1G/3G user/kernel split"
287endchoice
288
289config PAGE_OFFSET
290 hex
291 depends on !64BIT
292 default 0xF0000000 if VMSPLIT_3_75G
293 default 0xE0000000 if VMSPLIT_3_5G
294 default 0xB0000000 if VMSPLIT_2_75G
295 default 0xA0000000 if VMSPLIT_2_5G
296 default 0x90000000 if VMSPLIT_2_25G
297 default 0x80000000 if VMSPLIT_2G
298 default 0x40000000 if VMSPLIT_1G
299 default 0xC0000000
300
301source "mm/Kconfig"
302
303config CMDLINE_BOOL
304 bool "Built-in kernel command line"
305 default n
306 ---help---
307 Allow for specifying boot arguments to the kernel at
308 build time. On some systems (e.g. embedded ones), it is
309 necessary or convenient to provide some or all of the
310 kernel boot arguments with the kernel itself (that is,
311 to not rely on the boot loader to provide them.)
312
313 To compile command line arguments into the kernel,
314 set this option to 'Y', then fill in the
315 the boot arguments in CONFIG_CMDLINE.
316
317 Systems with fully functional boot loaders (e.g. mboot, or
318 if booting over PCI) should leave this option set to 'N'.
319
320config CMDLINE
321 string "Built-in kernel command string"
322 depends on CMDLINE_BOOL
323 default ""
324 ---help---
325 Enter arguments here that should be compiled into the kernel
326 image and used at boot time. If the boot loader provides a
327 command line at boot time, it is appended to this string to
328 form the full kernel command line, when the system boots.
329
330 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
331 change this behavior.
332
333 In most cases, the command line (whether built-in or provided
334 by the boot loader) should specify the device for the root
335 file system.
336
337config CMDLINE_OVERRIDE
338 bool "Built-in command line overrides boot loader arguments"
339 default n
340 depends on CMDLINE_BOOL
341 ---help---
342 Set this option to 'Y' to have the kernel ignore the boot loader
343 command line, and use ONLY the built-in command line.
344
345 This is used to work around broken boot loaders. This should
346 be set to 'N' under normal conditions.
347
348config VMALLOC_RESERVE
349 hex
350 default 0x1000000
351
352config HARDWALL
353 bool "Hardwall support to allow access to user dynamic network"
354 default y
355
356config KERNEL_PL
357 int "Processor protection level for kernel"
358 range 1 2
359 default 2 if TILEGX
360 default 1 if !TILEGX
361 ---help---
362 Since MDE 4.2, the Tilera hypervisor runs the kernel
363 at PL2 by default. If running under an older hypervisor,
364 or as a KVM guest, you must run at PL1. (The current
365 hypervisor may also be recompiled with "make HV_PL=2" to
366 allow it to run a kernel at PL1, but clients running at PL1
367 are not expected to be supported indefinitely.)
368
369 If you're not sure, don't change the default.
370
371source "arch/tile/gxio/Kconfig"
372
373endmenu # Tilera-specific configuration
374
375menu "Bus options"
376
377config PCI
378 bool "PCI support"
379 default y
380 select PCI_DOMAINS
381 select GENERIC_PCI_IOMAP
382 select TILE_GXIO_TRIO if TILEGX
383 select ARCH_SUPPORTS_MSI if TILEGX
384 select PCI_MSI if TILEGX
385 ---help---
386 Enable PCI root complex support, so PCIe endpoint devices can
387 be attached to the Tile chip. Many, but not all, PCI devices
388 are supported under Tilera's root complex driver.
389
390config PCI_DOMAINS
391 bool
392
393config NO_IOMEM
394 def_bool !PCI
395
396config NO_IOPORT
397 def_bool !PCI
398
399source "drivers/pci/Kconfig"
400
401config TILE_USB
402 tristate "Tilera USB host adapter support"
403 default y
404 depends on USB
405 depends on TILEGX
406 select TILE_GXIO_USB_HOST
407 ---help---
408 Provides USB host adapter support for the built-in EHCI and OHCI
409 interfaces on TILE-Gx chips.
410
411source "drivers/pci/hotplug/Kconfig"
412
413endmenu
414
415menu "Executable file formats"
416
417source "fs/Kconfig.binfmt"
418
419endmenu
420
421source "net/Kconfig"
422
423source "drivers/Kconfig"
424
425source "fs/Kconfig"
426
427source "arch/tile/Kconfig.debug"
428
429source "security/Kconfig"
430
431source "crypto/Kconfig"
432
433source "lib/Kconfig"
434
435source "arch/tile/kvm/Kconfig"