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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 HAVE_PERF_EVENTS
  7         select USE_PMC if PERF_EVENTS
  8         select HAVE_DMA_API_DEBUG
  9         select HAVE_KVM if !TILEGX
 10         select GENERIC_FIND_FIRST_BIT
 11         select SYSCTL_EXCEPTION_TRACE
 12         select CC_OPTIMIZE_FOR_SIZE
 13         select HAVE_DEBUG_KMEMLEAK
 14         select GENERIC_IRQ_PROBE
 15         select GENERIC_PENDING_IRQ if SMP
 16         select GENERIC_IRQ_SHOW
 17         select HAVE_DEBUG_BUGVERBOSE
 18         select VIRT_TO_BUS
 19         select SYS_HYPERVISOR
 20         select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
 21         select ARCH_HAS_DEVMEM_IS_ALLOWED
 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 USER_STACKTRACE_SUPPORT
 28         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 29         select HAVE_DEBUG_STACKOVERFLOW
 30         select ARCH_WANT_FRAME_POINTERS
 31         select HAVE_CONTEXT_TRACKING
 32         select EDAC_SUPPORT
 33         select GENERIC_STRNCPY_FROM_USER
 34         select GENERIC_STRNLEN_USER
 35         select HAVE_ARCH_SECCOMP_FILTER
 36 
 37 # FIXME: investigate whether we need/want these options.
 38 #       select HAVE_IOREMAP_PROT
 39 #       select HAVE_OPTPROBES
 40 #       select HAVE_REGS_AND_STACK_ACCESS_API
 41 #       select HAVE_HW_BREAKPOINT
 42 #       select PERF_EVENTS
 43 #       select HAVE_USER_RETURN_NOTIFIER
 44 #       config NO_BOOTMEM
 45 #       config ARCH_SUPPORTS_DEBUG_PAGEALLOC
 46 #       config HUGETLB_PAGE_SIZE_VARIABLE
 47 
 48 config MMU
 49         def_bool y
 50 
 51 config GENERIC_CSUM
 52         def_bool y
 53 
 54 config HAVE_ARCH_ALLOC_REMAP
 55         def_bool y
 56 
 57 config HAVE_SETUP_PER_CPU_AREA
 58         def_bool y
 59 
 60 config NEED_PER_CPU_PAGE_FIRST_CHUNK
 61         def_bool y
 62 
 63 config SYS_SUPPORTS_HUGETLBFS
 64         def_bool y
 65 
 66 # Support for additional huge page sizes besides HPAGE_SIZE.
 67 # The software support is currently only present in the TILE-Gx
 68 # hypervisor. TILEPro in any case does not support page sizes
 69 # larger than the default HPAGE_SIZE.
 70 config HUGETLB_SUPER_PAGES
 71         depends on HUGETLB_PAGE && TILEGX
 72         def_bool y
 73 
 74 config GENERIC_TIME_VSYSCALL
 75         def_bool y
 76 
 77 # Enable PMC if PERF_EVENTS, OPROFILE, or WATCHPOINTS are enabled.
 78 config USE_PMC
 79         bool
 80 
 81 # FIXME: tilegx can implement a more efficient rwsem.
 82 config RWSEM_GENERIC_SPINLOCK
 83         def_bool y
 84 
 85 # We only support gcc 4.4 and above, so this should work.
 86 config ARCH_SUPPORTS_OPTIMIZED_INLINING
 87         def_bool y
 88 
 89 config ARCH_PHYS_ADDR_T_64BIT
 90         def_bool y
 91 
 92 config ARCH_DMA_ADDR_T_64BIT
 93         def_bool y
 94 
 95 config NEED_DMA_MAP_STATE
 96         def_bool y
 97 
 98 config ARCH_HAS_DMA_SET_COHERENT_MASK
 99         bool
100 
101 config LOCKDEP_SUPPORT
102         def_bool y
103 
104 config STACKTRACE_SUPPORT
105         def_bool y
106         select STACKTRACE
107 
108 # We use discontigmem for now; at some point we may want to switch
109 # to sparsemem (Tilera bug 7996).
110 config ARCH_DISCONTIGMEM_ENABLE
111         def_bool y
112 
113 config ARCH_DISCONTIGMEM_DEFAULT
114         def_bool y
115 
116 config TRACE_IRQFLAGS_SUPPORT
117         def_bool y
118 
119 # SMP is required for Tilera Linux.
120 config SMP
121         def_bool y
122 
123 config HVC_TILE
124         depends on TTY
125         select HVC_DRIVER
126         select HVC_IRQ if TILEGX
127         def_bool y
128 
129 # Building with ARCH=tilegx (or ARCH=tile) implies using the
130 # 64-bit TILE-Gx toolchain, so force CONFIG_TILEGX on.
131 config TILEGX
132         def_bool ARCH != "tilepro"
133         select SPARSE_IRQ
134         select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
135         select HAVE_FUNCTION_TRACER
136         select HAVE_FUNCTION_GRAPH_TRACER
137         select HAVE_DYNAMIC_FTRACE
138         select HAVE_FTRACE_MCOUNT_RECORD
139         select HAVE_KPROBES
140         select HAVE_KRETPROBES
141         select HAVE_ARCH_KGDB
142         select ARCH_SUPPORTS_ATOMIC_RMW
143         select HAVE_ARCH_JUMP_LABEL
144 
145 config TILEPRO
146         def_bool !TILEGX
147 
148 config 64BIT
149         def_bool TILEGX
150 
151 config ARCH_DEFCONFIG
152         string
153         default "arch/tile/configs/tilepro_defconfig" if !TILEGX
154         default "arch/tile/configs/tilegx_defconfig" if TILEGX
155 
156 config PGTABLE_LEVELS
157         int
158         default 3 if 64BIT
159         default 2
160 
161 source "init/Kconfig"
162 
163 source "kernel/Kconfig.freezer"
164 
165 menu "Tilera-specific configuration"
166 
167 config NR_CPUS
168         int "Maximum number of tiles (2-255)"
169         range 2 255
170         depends on SMP
171         default "64"
172         ---help---
173           Building with 64 is the recommended value, but a slightly
174           smaller kernel memory footprint results from using a smaller
175           value on chips with fewer tiles.
176 
177 choice
178         prompt "Kernel page size"
179         default PAGE_SIZE_64KB
180         help
181           This lets you select the page size of the kernel.  For best
182           performance on memory-intensive applications, a page size of 64KB
183           is recommended.  For workloads involving many small files, many
184           connections, etc., it may be better to select 16KB, which uses
185           memory more efficiently at some cost in TLB performance.
186 
187           Note that for TILEPro, you must also rebuild the hypervisor
188           with a matching page size.
189 
190 config PAGE_SIZE_4KB
191         bool "4KB" if TILEPRO
192 
193 config PAGE_SIZE_16KB
194         bool "16KB"
195 
196 config PAGE_SIZE_64KB
197         bool "64KB"
198 
199 endchoice
200 
201 source "kernel/Kconfig.hz"
202 
203 config KEXEC
204         bool "kexec system call"
205         select KEXEC_CORE
206         ---help---
207           kexec is a system call that implements the ability to shutdown your
208           current kernel, and to start another kernel.  It is like a reboot
209           but it is independent of the system firmware.   It is used
210           to implement the "mboot" Tilera booter.
211 
212           The name comes from the similarity to the exec system call.
213 
214 config COMPAT
215         bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
216         depends on TILEGX
217         select COMPAT_BINFMT_ELF
218         default y
219         ---help---
220           If enabled, the kernel will support running TILE-Gx binaries
221           that were built with the -m32 option.
222 
223 config SECCOMP
224         bool "Enable seccomp to safely compute untrusted bytecode"
225         depends on PROC_FS
226         help
227           This kernel feature is useful for number crunching applications
228           that may need to compute untrusted bytecode during their
229           execution. By using pipes or other transports made available to
230           the process as file descriptors supporting the read/write
231           syscalls, it's possible to isolate those applications in
232           their own address space using seccomp. Once seccomp is
233           enabled via prctl, it cannot be disabled and the task is only
234           allowed to execute a few safe syscalls defined by each seccomp
235           mode.
236 
237           If unsure, say N.
238 
239 config SYSVIPC_COMPAT
240         def_bool y
241         depends on COMPAT && SYSVIPC
242 
243 # We do not currently support disabling HIGHMEM on tilepro.
244 config HIGHMEM
245         bool # "Support for more than 512 MB of RAM"
246         default !TILEGX
247         ---help---
248           Linux can use the full amount of RAM in the system by
249           default.  However, the address space of TILE processors is
250           only 4 Gigabytes large. That means that, if you have a large
251           amount of physical memory, not all of it can be "permanently
252           mapped" by the kernel. The physical memory that's not
253           permanently mapped is called "high memory".
254 
255           If you are compiling a kernel which will never run on a
256           machine with more than 512 MB total physical RAM, answer
257           "false" here. This will result in the kernel mapping all of
258           physical memory into the top 1 GB of virtual memory space.
259 
260           If unsure, say "true".
261 
262 config ZONE_DMA
263         def_bool y
264 
265 config IOMMU_HELPER
266         bool
267 
268 config NEED_SG_DMA_LENGTH
269         bool
270 
271 config SWIOTLB
272         bool
273         default TILEGX
274         select IOMMU_HELPER
275         select NEED_SG_DMA_LENGTH
276         select ARCH_HAS_DMA_SET_COHERENT_MASK
277 
278 # We do not currently support disabling NUMA.
279 config NUMA
280         bool # "NUMA Memory Allocation and Scheduler Support"
281         depends on SMP && DISCONTIGMEM
282         default y
283         ---help---
284           NUMA memory allocation is required for TILE processors
285           unless booting with memory striping enabled in the
286           hypervisor, or with only a single memory controller.
287           It is recommended that this option always be enabled.
288 
289 config NODES_SHIFT
290         int "Log base 2 of the max number of memory controllers"
291         default 2
292         depends on NEED_MULTIPLE_NODES
293         ---help---
294           By default, 2, i.e. 2^2 == 4 DDR2 controllers.
295           In a system with more controllers, this value should be raised.
296 
297 choice
298         depends on !TILEGX
299         prompt "Memory split" if EXPERT
300         default VMSPLIT_3G
301         ---help---
302           Select the desired split between kernel and user memory.
303 
304           If the address range available to the kernel is less than the
305           physical memory installed, the remaining memory will be available
306           as "high memory". Accessing high memory is a little more costly
307           than low memory, as it needs to be mapped into the kernel first.
308           Note that increasing the kernel address space limits the range
309           available to user programs, making the address space there
310           tighter.  Selecting anything other than the default 3G/1G split
311           will also likely make your kernel incompatible with binary-only
312           kernel modules.
313 
314           If you are not absolutely sure what you are doing, leave this
315           option alone!
316 
317         config VMSPLIT_3_75G
318                 bool "3.75G/0.25G user/kernel split (no kernel networking)"
319         config VMSPLIT_3_5G
320                 bool "3.5G/0.5G user/kernel split"
321         config VMSPLIT_3G
322                 bool "3G/1G user/kernel split"
323         config VMSPLIT_2_75G
324                 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
325         config VMSPLIT_2_5G
326                 bool "2.5G/1.5G user/kernel split"
327         config VMSPLIT_2_25G
328                 bool "2.25G/1.75G user/kernel split"
329         config VMSPLIT_2G
330                 bool "2G/2G user/kernel split"
331         config VMSPLIT_1G
332                 bool "1G/3G user/kernel split"
333 endchoice
334 
335 config PAGE_OFFSET
336         hex
337         depends on !64BIT
338         default 0xF0000000 if VMSPLIT_3_75G
339         default 0xE0000000 if VMSPLIT_3_5G
340         default 0xB0000000 if VMSPLIT_2_75G
341         default 0xA0000000 if VMSPLIT_2_5G
342         default 0x90000000 if VMSPLIT_2_25G
343         default 0x80000000 if VMSPLIT_2G
344         default 0x40000000 if VMSPLIT_1G
345         default 0xC0000000
346 
347 source "mm/Kconfig"
348 
349 source "kernel/Kconfig.preempt"
350 
351 config CMDLINE_BOOL
352         bool "Built-in kernel command line"
353         default n
354         ---help---
355           Allow for specifying boot arguments to the kernel at
356           build time.  On some systems (e.g. embedded ones), it is
357           necessary or convenient to provide some or all of the
358           kernel boot arguments with the kernel itself (that is,
359           to not rely on the boot loader to provide them.)
360 
361           To compile command line arguments into the kernel,
362           set this option to 'Y', then fill in the
363           the boot arguments in CONFIG_CMDLINE.
364 
365           Systems with fully functional boot loaders (e.g. mboot, or
366           if booting over PCI) should leave this option set to 'N'.
367 
368 config CMDLINE
369         string "Built-in kernel command string"
370         depends on CMDLINE_BOOL
371         default ""
372         ---help---
373           Enter arguments here that should be compiled into the kernel
374           image and used at boot time.  If the boot loader provides a
375           command line at boot time, it is appended to this string to
376           form the full kernel command line, when the system boots.
377 
378           However, you can use the CONFIG_CMDLINE_OVERRIDE option to
379           change this behavior.
380 
381           In most cases, the command line (whether built-in or provided
382           by the boot loader) should specify the device for the root
383           file system.
384 
385 config CMDLINE_OVERRIDE
386         bool "Built-in command line overrides boot loader arguments"
387         default n
388         depends on CMDLINE_BOOL
389         ---help---
390           Set this option to 'Y' to have the kernel ignore the boot loader
391           command line, and use ONLY the built-in command line.
392 
393           This is used to work around broken boot loaders.  This should
394           be set to 'N' under normal conditions.
395 
396 config VMALLOC_RESERVE
397         hex
398         default 0x2000000
399 
400 config HARDWALL
401         bool "Hardwall support to allow access to user dynamic network"
402         default y
403 
404 config KERNEL_PL
405         int "Processor protection level for kernel"
406         range 1 2
407         default 2 if TILEGX
408         default 1 if !TILEGX
409         ---help---
410           Since MDE 4.2, the Tilera hypervisor runs the kernel
411           at PL2 by default.  If running under an older hypervisor,
412           or as a KVM guest, you must run at PL1.  (The current
413           hypervisor may also be recompiled with "make HV_PL=2" to
414           allow it to run a kernel at PL1, but clients running at PL1
415           are not expected to be supported indefinitely.)
416 
417           If you're not sure, don't change the default.
418 
419 source "arch/tile/gxio/Kconfig"
420 
421 endmenu  # Tilera-specific configuration
422 
423 menu "Bus options"
424 
425 config PCI
426         bool "PCI support"
427         default y
428         select PCI_DOMAINS
429         select GENERIC_PCI_IOMAP
430         select TILE_GXIO_TRIO if TILEGX
431         select PCI_MSI if TILEGX
432         ---help---
433           Enable PCI root complex support, so PCIe endpoint devices can
434           be attached to the Tile chip.  Many, but not all, PCI devices
435           are supported under Tilera's root complex driver.
436 
437 config PCI_DOMAINS
438         bool
439 
440 config NO_IOMEM
441         def_bool !PCI
442 
443 config NO_IOPORT_MAP
444         def_bool !PCI
445 
446 config TILE_PCI_IO
447         bool "PCI I/O space support"
448         default n
449         depends on PCI
450         depends on TILEGX
451         ---help---
452           Enable PCI I/O space support on TILEGx. Since the PCI I/O space
453           is used by few modern PCIe endpoint devices, its support is disabled
454           by default to save the TRIO PIO Region resource for other purposes.
455 
456 source "drivers/pci/Kconfig"
457 
458 config TILE_USB
459         tristate "Tilera USB host adapter support"
460         default y
461         depends on USB
462         depends on TILEGX
463         select TILE_GXIO_USB_HOST
464         ---help---
465           Provides USB host adapter support for the built-in EHCI and OHCI
466           interfaces on TILE-Gx chips.
467 
468 endmenu
469 
470 menu "Executable file formats"
471 
472 source "fs/Kconfig.binfmt"
473 
474 endmenu
475 
476 source "net/Kconfig"
477 
478 source "drivers/Kconfig"
479 
480 source "fs/Kconfig"
481 
482 source "arch/tile/Kconfig.debug"
483 
484 source "security/Kconfig"
485 
486 source "crypto/Kconfig"
487 
488 source "lib/Kconfig"
489 
490 source "arch/tile/kvm/Kconfig"

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