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

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