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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_ATTRS
  9         select HAVE_DMA_API_DEBUG
 10         select HAVE_KVM if !TILEGX
 11         select GENERIC_FIND_FIRST_BIT
 12         select SYSCTL_EXCEPTION_TRACE
 13         select CC_OPTIMIZE_FOR_SIZE
 14         select HAVE_DEBUG_KMEMLEAK
 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 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 config STRICT_DEVMEM
120         def_bool y
121 
122 # SMP is required for Tilera Linux.
123 config SMP
124         def_bool y
125 
126 config HVC_TILE
127         depends on TTY
128         select HVC_DRIVER
129         select HVC_IRQ if TILEGX
130         def_bool y
131 
132 # Building with ARCH=tilegx (or ARCH=tile) implies using the
133 # 64-bit TILE-Gx toolchain, so force CONFIG_TILEGX on.
134 config TILEGX
135         def_bool ARCH != "tilepro"
136         select SPARSE_IRQ
137         select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
138         select HAVE_FUNCTION_TRACER
139         select HAVE_FUNCTION_GRAPH_TRACER
140         select HAVE_DYNAMIC_FTRACE
141         select HAVE_FTRACE_MCOUNT_RECORD
142         select HAVE_KPROBES
143         select HAVE_KRETPROBES
144         select HAVE_ARCH_KGDB
145         select ARCH_SUPPORTS_ATOMIC_RMW
146 
147 config TILEPRO
148         def_bool !TILEGX
149 
150 config 64BIT
151         def_bool TILEGX
152 
153 config ARCH_DEFCONFIG
154         string
155         default "arch/tile/configs/tilepro_defconfig" if !TILEGX
156         default "arch/tile/configs/tilegx_defconfig" if TILEGX
157 
158 config PGTABLE_LEVELS
159         int
160         default 3 if 64BIT
161         default 2
162 
163 source "init/Kconfig"
164 
165 source "kernel/Kconfig.freezer"
166 
167 menu "Tilera-specific configuration"
168 
169 config NR_CPUS
170         int "Maximum number of tiles (2-255)"
171         range 2 255
172         depends on SMP
173         default "64"
174         ---help---
175           Building with 64 is the recommended value, but a slightly
176           smaller kernel memory footprint results from using a smaller
177           value on chips with fewer tiles.
178 
179 choice
180         prompt "Kernel page size"
181         default PAGE_SIZE_64KB
182         help
183           This lets you select the page size of the kernel.  For best
184           performance on memory-intensive applications, a page size of 64KB
185           is recommended.  For workloads involving many small files, many
186           connections, etc., it may be better to select 16KB, which uses
187           memory more efficiently at some cost in TLB performance.
188 
189           Note that for TILEPro, you must also rebuild the hypervisor
190           with a matching page size.
191 
192 config PAGE_SIZE_4KB
193         bool "4KB" if TILEPRO
194 
195 config PAGE_SIZE_16KB
196         bool "16KB"
197 
198 config PAGE_SIZE_64KB
199         bool "64KB"
200 
201 endchoice
202 
203 source "kernel/Kconfig.hz"
204 
205 config KEXEC
206         bool "kexec system call"
207         select KEXEC_CORE
208         ---help---
209           kexec is a system call that implements the ability to shutdown your
210           current kernel, and to start another kernel.  It is like a reboot
211           but it is independent of the system firmware.   It is used
212           to implement the "mboot" Tilera booter.
213 
214           The name comes from the similarity to the exec system call.
215 
216 config COMPAT
217         bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
218         depends on TILEGX
219         select COMPAT_BINFMT_ELF
220         default y
221         ---help---
222           If enabled, the kernel will support running TILE-Gx binaries
223           that were built with the -m32 option.
224 
225 config SECCOMP
226         bool "Enable seccomp to safely compute untrusted bytecode"
227         depends on PROC_FS
228         help
229           This kernel feature is useful for number crunching applications
230           that may need to compute untrusted bytecode during their
231           execution. By using pipes or other transports made available to
232           the process as file descriptors supporting the read/write
233           syscalls, it's possible to isolate those applications in
234           their own address space using seccomp. Once seccomp is
235           enabled via prctl, it cannot be disabled and the task is only
236           allowed to execute a few safe syscalls defined by each seccomp
237           mode.
238 
239           If unsure, say N.
240 
241 config SYSVIPC_COMPAT
242         def_bool y
243         depends on COMPAT && SYSVIPC
244 
245 # We do not currently support disabling HIGHMEM on tilepro.
246 config HIGHMEM
247         bool # "Support for more than 512 MB of RAM"
248         default !TILEGX
249         ---help---
250           Linux can use the full amount of RAM in the system by
251           default.  However, the address space of TILE processors is
252           only 4 Gigabytes large. That means that, if you have a large
253           amount of physical memory, not all of it can be "permanently
254           mapped" by the kernel. The physical memory that's not
255           permanently mapped is called "high memory".
256 
257           If you are compiling a kernel which will never run on a
258           machine with more than 512 MB total physical RAM, answer
259           "false" here. This will result in the kernel mapping all of
260           physical memory into the top 1 GB of virtual memory space.
261 
262           If unsure, say "true".
263 
264 config ZONE_DMA
265         def_bool y
266 
267 config IOMMU_HELPER
268         bool
269 
270 config NEED_SG_DMA_LENGTH
271         bool
272 
273 config SWIOTLB
274         bool
275         default TILEGX
276         select IOMMU_HELPER
277         select NEED_SG_DMA_LENGTH
278         select ARCH_HAS_DMA_SET_COHERENT_MASK
279 
280 # We do not currently support disabling NUMA.
281 config NUMA
282         bool # "NUMA Memory Allocation and Scheduler Support"
283         depends on SMP && DISCONTIGMEM
284         default y
285         ---help---
286           NUMA memory allocation is required for TILE processors
287           unless booting with memory striping enabled in the
288           hypervisor, or with only a single memory controller.
289           It is recommended that this option always be enabled.
290 
291 config NODES_SHIFT
292         int "Log base 2 of the max number of memory controllers"
293         default 2
294         depends on NEED_MULTIPLE_NODES
295         ---help---
296           By default, 2, i.e. 2^2 == 4 DDR2 controllers.
297           In a system with more controllers, this value should be raised.
298 
299 choice
300         depends on !TILEGX
301         prompt "Memory split" if EXPERT
302         default VMSPLIT_3G
303         ---help---
304           Select the desired split between kernel and user memory.
305 
306           If the address range available to the kernel is less than the
307           physical memory installed, the remaining memory will be available
308           as "high memory". Accessing high memory is a little more costly
309           than low memory, as it needs to be mapped into the kernel first.
310           Note that increasing the kernel address space limits the range
311           available to user programs, making the address space there
312           tighter.  Selecting anything other than the default 3G/1G split
313           will also likely make your kernel incompatible with binary-only
314           kernel modules.
315 
316           If you are not absolutely sure what you are doing, leave this
317           option alone!
318 
319         config VMSPLIT_3_75G
320                 bool "3.75G/0.25G user/kernel split (no kernel networking)"
321         config VMSPLIT_3_5G
322                 bool "3.5G/0.5G user/kernel split"
323         config VMSPLIT_3G
324                 bool "3G/1G user/kernel split"
325         config VMSPLIT_2_75G
326                 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
327         config VMSPLIT_2_5G
328                 bool "2.5G/1.5G user/kernel split"
329         config VMSPLIT_2_25G
330                 bool "2.25G/1.75G user/kernel split"
331         config VMSPLIT_2G
332                 bool "2G/2G user/kernel split"
333         config VMSPLIT_1G
334                 bool "1G/3G user/kernel split"
335 endchoice
336 
337 config PAGE_OFFSET
338         hex
339         depends on !64BIT
340         default 0xF0000000 if VMSPLIT_3_75G
341         default 0xE0000000 if VMSPLIT_3_5G
342         default 0xB0000000 if VMSPLIT_2_75G
343         default 0xA0000000 if VMSPLIT_2_5G
344         default 0x90000000 if VMSPLIT_2_25G
345         default 0x80000000 if VMSPLIT_2G
346         default 0x40000000 if VMSPLIT_1G
347         default 0xC0000000
348 
349 source "mm/Kconfig"
350 
351 source "kernel/Kconfig.preempt"
352 
353 config CMDLINE_BOOL
354         bool "Built-in kernel command line"
355         default n
356         ---help---
357           Allow for specifying boot arguments to the kernel at
358           build time.  On some systems (e.g. embedded ones), it is
359           necessary or convenient to provide some or all of the
360           kernel boot arguments with the kernel itself (that is,
361           to not rely on the boot loader to provide them.)
362 
363           To compile command line arguments into the kernel,
364           set this option to 'Y', then fill in the
365           the boot arguments in CONFIG_CMDLINE.
366 
367           Systems with fully functional boot loaders (e.g. mboot, or
368           if booting over PCI) should leave this option set to 'N'.
369 
370 config CMDLINE
371         string "Built-in kernel command string"
372         depends on CMDLINE_BOOL
373         default ""
374         ---help---
375           Enter arguments here that should be compiled into the kernel
376           image and used at boot time.  If the boot loader provides a
377           command line at boot time, it is appended to this string to
378           form the full kernel command line, when the system boots.
379 
380           However, you can use the CONFIG_CMDLINE_OVERRIDE option to
381           change this behavior.
382 
383           In most cases, the command line (whether built-in or provided
384           by the boot loader) should specify the device for the root
385           file system.
386 
387 config CMDLINE_OVERRIDE
388         bool "Built-in command line overrides boot loader arguments"
389         default n
390         depends on CMDLINE_BOOL
391         ---help---
392           Set this option to 'Y' to have the kernel ignore the boot loader
393           command line, and use ONLY the built-in command line.
394 
395           This is used to work around broken boot loaders.  This should
396           be set to 'N' under normal conditions.
397 
398 config VMALLOC_RESERVE
399         hex
400         default 0x2000000
401 
402 config HARDWALL
403         bool "Hardwall support to allow access to user dynamic network"
404         default y
405 
406 config KERNEL_PL
407         int "Processor protection level for kernel"
408         range 1 2
409         default 2 if TILEGX
410         default 1 if !TILEGX
411         ---help---
412           Since MDE 4.2, the Tilera hypervisor runs the kernel
413           at PL2 by default.  If running under an older hypervisor,
414           or as a KVM guest, you must run at PL1.  (The current
415           hypervisor may also be recompiled with "make HV_PL=2" to
416           allow it to run a kernel at PL1, but clients running at PL1
417           are not expected to be supported indefinitely.)
418 
419           If you're not sure, don't change the default.
420 
421 source "arch/tile/gxio/Kconfig"
422 
423 endmenu  # Tilera-specific configuration
424 
425 menu "Bus options"
426 
427 config PCI
428         bool "PCI support"
429         default y
430         select PCI_DOMAINS
431         select GENERIC_PCI_IOMAP
432         select TILE_GXIO_TRIO if TILEGX
433         select PCI_MSI if TILEGX
434         ---help---
435           Enable PCI root complex support, so PCIe endpoint devices can
436           be attached to the Tile chip.  Many, but not all, PCI devices
437           are supported under Tilera's root complex driver.
438 
439 config PCI_DOMAINS
440         bool
441 
442 config NO_IOMEM
443         def_bool !PCI
444 
445 config NO_IOPORT_MAP
446         def_bool !PCI
447 
448 config TILE_PCI_IO
449         bool "PCI I/O space support"
450         default n
451         depends on PCI
452         depends on TILEGX
453         ---help---
454           Enable PCI I/O space support on TILEGx. Since the PCI I/O space
455           is used by few modern PCIe endpoint devices, its support is disabled
456           by default to save the TRIO PIO Region resource for other purposes.
457 
458 source "drivers/pci/Kconfig"
459 
460 source "drivers/pci/pcie/Kconfig"
461 
462 config TILE_USB
463         tristate "Tilera USB host adapter support"
464         default y
465         depends on USB
466         depends on TILEGX
467         select TILE_GXIO_USB_HOST
468         ---help---
469           Provides USB host adapter support for the built-in EHCI and OHCI
470           interfaces on TILE-Gx chips.
471 
472 source "drivers/pci/hotplug/Kconfig"
473 
474 endmenu
475 
476 menu "Executable file formats"
477 
478 source "fs/Kconfig.binfmt"
479 
480 endmenu
481 
482 source "net/Kconfig"
483 
484 source "drivers/Kconfig"
485 
486 source "fs/Kconfig"
487 
488 source "arch/tile/Kconfig.debug"
489 
490 source "security/Kconfig"
491 
492 source "crypto/Kconfig"
493 
494 source "lib/Kconfig"
495 
496 source "arch/tile/kvm/Kconfig"

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