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1 # SPDX-License-Identifier: GPL-2.0
2 # For a description of the syntax of this configuration file,
3 # see Documentation/kbuild/kconfig-language.txt.
4
5 config TILE
6 def_bool y
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"