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

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