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Paul Mackerras14cf11a2005-09-26 16:04:21 +10001menu "Kernel hacking"
2
3source "lib/Kconfig.debug"
4
Michael Ellermanba55bd72009-06-09 20:48:51 +00005config PPC_DISABLE_WERROR
6 bool "Don't build arch/powerpc code with -Werror"
7 default n
8 help
9 This option tells the compiler NOT to build the code under
10 arch/powerpc with the -Werror flag (which means warnings
11 are treated as errors).
12
13 Only enable this if you are hitting a build failure in the
14 arch/powerpc code caused by a warning, and you don't feel
15 inclined to fix it.
16
17config PPC_WERROR
18 bool
19 depends on !PPC_DISABLE_WERROR
20 default y
21
Michael Ellermanf1e7c202015-03-25 20:11:56 +110022config STRICT_MM_TYPECHECKS
23 bool "Do extra type checking on mm types"
24 default n
25 help
26 This option turns on extra type checking for some mm related types.
27
28 If you don't know what this means, say N.
29
Johannes Bergc4d04be2008-11-20 03:24:07 +000030config PRINT_STACK_DEPTH
31 int "Stack depth to print" if DEBUG_KERNEL
32 default 64
33 help
34 This option allows you to set the stack depth that the kernel
35 prints in stack traces. This can be useful if your display is
36 too small and stack traces cause important information to
37 scroll off the screen.
38
Mike Kravetz57852a82006-09-06 16:23:12 -070039config HCALL_STATS
40 bool "Hypervisor call instrumentation"
Anton Blanchardc8cd0932009-10-26 18:50:29 +000041 depends on PPC_PSERIES && DEBUG_FS && TRACEPOINTS
Mike Kravetz57852a82006-09-06 16:23:12 -070042 help
43 Adds code to keep track of the number of hypervisor calls made and
David Sterba3dde6ad2007-05-09 07:12:20 +020044 the amount of time spent in hypervisor calls. Wall time spent in
Mike Kravetz57852a82006-09-06 16:23:12 -070045 each call is always calculated, and if available CPU cycles spent
46 are also calculated. A directory named hcall_inst is added at the
47 root of the debugfs filesystem. Within the hcall_inst directory
48 are files that contain CPU specific call statistics.
49
50 This option will add a small amount of overhead to all hypervisor
51 calls.
52
Geert Uytterhoeven80947e72009-05-18 02:10:05 +000053config PPC_EMULATED_STATS
54 bool "Emulated instructions tracking"
55 depends on DEBUG_FS
56 help
57 Adds code to keep track of the number of instructions that are
58 emulated by the in-kernel emulator. Counters for the various classes
59 of emulated instructions are available under
60 powerpc/emulated_instructions/ in the root of the debugfs file
61 system. Optionally (controlled by
62 powerpc/emulated_instructions/do_warn in debugfs), rate-limited
63 warnings can be printed to the console when instructions are
64 emulated.
65
Michael Ellermanae0dc732008-06-24 11:32:32 +100066config CODE_PATCHING_SELFTEST
67 bool "Run self-tests of the code-patching code."
68 depends on DEBUG_KERNEL
69 default n
70
Michael Ellerman362e7702008-06-24 11:33:03 +100071config FTR_FIXUP_SELFTEST
72 bool "Run self-tests of the feature-fixup code."
73 depends on DEBUG_KERNEL
74 default n
75
Michael Ellerman7e302862008-08-06 09:10:01 +100076config MSI_BITMAP_SELFTEST
77 bool "Run self-tests of the MSI bitmap code."
78 depends on DEBUG_KERNEL
79 default n
80
Paul Mackerras14cf11a2005-09-26 16:04:21 +100081config XMON
82 bool "Include xmon kernel debugger"
Jason Wessel17ce4522008-07-23 11:30:15 -050083 depends on DEBUG_KERNEL
Paul Mackerras14cf11a2005-09-26 16:04:21 +100084 help
85 Include in-kernel hooks for the xmon kernel monitor/debugger.
86 Unless you are intending to debug the kernel, say N here.
Paul Mackerrasff642082005-10-10 22:15:52 +100087 Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
88 nothing will appear on the screen (xmon writes directly to the
89 framebuffer memory).
90 The cmdline option 'xmon' or 'xmon=early' will drop into xmon
91 very early during boot. 'xmon=on' will just enable the xmon
92 debugger hooks. 'xmon=off' will disable the debugger hooks
93 if CONFIG_XMON_DEFAULT is set.
Olaf Hering26c8af52006-09-08 16:29:21 +020094 xmon will print a backtrace on the very first invocation.
95 'xmon=nobt' will disable this autobacktrace.
Paul Mackerrasff642082005-10-10 22:15:52 +100096
97config XMON_DEFAULT
98 bool "Enable xmon by default"
99 depends on XMON
100 help
101 xmon is normally disabled unless booted with 'xmon=on'.
102 Use 'xmon=off' to disable xmon init during runtime.
103
Michael Ellermane0426042006-11-23 00:46:45 +0100104config XMON_DISASSEMBLY
105 bool "Include disassembly support in xmon"
106 depends on XMON
107 default y
108 help
109 Include support for disassembling in xmon. You probably want
110 to say Y here, unless you're building for a memory-constrained
111 system.
112
Jason Wessel17ce4522008-07-23 11:30:15 -0500113config DEBUGGER
114 bool
115 depends on KGDB || XMON
116 default y
117
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000118config BDI_SWITCH
119 bool "Include BDI-2000 user context switcher"
Paul Mackerrasff642082005-10-10 22:15:52 +1000120 depends on DEBUG_KERNEL && PPC32
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000121 help
122 Include in-kernel support for the Abatron BDI2000 debugger.
123 Unless you are intending to debug the kernel with one of these
124 machines, say N here.
125
126config BOOTX_TEXT
127 bool "Support for early boot text console (BootX or OpenFirmware only)"
Kevin Hao52d99622015-03-12 20:32:50 +0800128 depends on PPC_BOOK3S
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000129 help
130 Say Y here to see progress messages from the boot firmware in text
131 mode. Requires either BootX or Open Firmware.
132
Michael Ellerman485a2d52006-05-09 16:03:51 +1000133config PPC_EARLY_DEBUG
134 bool "Early debugging (dangerous)"
Benjamin Herrenschmidt7ee17462007-12-11 14:48:24 +1100135 help
136 Say Y to enable some early debugging facilities that may be available
137 for your processor/board combination. Those facilities are hacks
138 intended to debug problems early during boot, this should not be
139 enabled in a production kernel.
140 Note that enabling this will also cause the kernel default log level
141 to be pushed to max automatically very early during boot
Michael Ellerman485a2d52006-05-09 16:03:51 +1000142
Michael Ellerman296167a2006-01-11 11:54:09 +1100143choice
Michael Ellerman485a2d52006-05-09 16:03:51 +1000144 prompt "Early debugging console"
145 depends on PPC_EARLY_DEBUG
Michael Ellerman296167a2006-01-11 11:54:09 +1100146 help
Michael Ellerman485a2d52006-05-09 16:03:51 +1000147 Use the selected console for early debugging. Careful, if you
148 enable debugging for the wrong type of machine your kernel
149 _will not boot_.
Michael Ellerman296167a2006-01-11 11:54:09 +1100150
Alistair Popple071df942013-04-29 13:42:43 +1000151config PPC_EARLY_DEBUG_BOOTX
152 bool "BootX or OpenFirmware"
153 depends on BOOTX_TEXT
154 help
155 Select this to enable early debugging for a machine using BootX
156 or OpenFirmware.
157
Michael Ellerman296167a2006-01-11 11:54:09 +1100158config PPC_EARLY_DEBUG_LPAR
159 bool "LPAR HV Console"
160 depends on PPC_PSERIES
161 help
162 Select this to enable early debugging for a machine with a HVC
163 console on vterm 0.
164
Benjamin Herrenschmidt4d2bb3f2011-05-12 13:46:38 +1000165config PPC_EARLY_DEBUG_LPAR_HVSI
166 bool "LPAR HVSI Console"
167 depends on PPC_PSERIES
168 help
169 Select this to enable early debugging for a machine with a HVSI
170 console on a specified vterm.
171
Michael Ellerman296167a2006-01-11 11:54:09 +1100172config PPC_EARLY_DEBUG_G5
173 bool "Apple G5"
174 depends on PPC_PMAC64
175 help
176 Select this to enable early debugging for Apple G5 machines.
177
Michael Ellermancc46bb92006-06-23 18:20:16 +1000178config PPC_EARLY_DEBUG_RTAS_PANEL
Michael Ellerman296167a2006-01-11 11:54:09 +1100179 bool "RTAS Panel"
180 depends on PPC_RTAS
181 help
182 Select this to enable early debugging via the RTAS panel.
183
Michael Ellermancc46bb92006-06-23 18:20:16 +1000184config PPC_EARLY_DEBUG_RTAS_CONSOLE
185 bool "RTAS Console"
186 depends on PPC_RTAS
187 select UDBG_RTAS_CONSOLE
188 help
189 Select this to enable early debugging via the RTAS console.
190
Michael Ellerman296167a2006-01-11 11:54:09 +1100191config PPC_EARLY_DEBUG_MAPLE
192 bool "Maple real mode"
193 depends on PPC_MAPLE
194 help
195 Select this to enable early debugging for Maple.
196
Olof Johansson39c870d2007-02-04 16:36:49 -0600197config PPC_EARLY_DEBUG_PAS_REALMODE
198 bool "PA Semi real mode"
199 depends on PPC_PASEMI
200 help
201 Select this to enable early debugging for PA Semi.
202 Output will be on UART0.
203
David Gibsond9b55a02007-05-08 12:59:31 +1000204config PPC_EARLY_DEBUG_44x
205 bool "Early serial debugging for IBM/AMCC 44x CPUs"
Alexander Grafb2677b82014-07-25 10:38:59 +0200206 depends on 44x
David Gibsond9b55a02007-05-08 12:59:31 +1000207 help
208 Select this to enable early debugging for IBM 44x chips via the
Hugh Blemings6bbc5472007-12-21 15:39:28 +1100209 inbuilt serial port. If you enable this, ensure you set
210 PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.
David Gibsond9b55a02007-05-08 12:59:31 +1000211
Benjamin Herrenschmidt9dae8af2007-12-21 15:39:26 +1100212config PPC_EARLY_DEBUG_40x
213 bool "Early serial debugging for IBM/AMCC 40x CPUs"
214 depends on 40x
215 help
216 Select this to enable early debugging for IBM 40x chips via the
217 inbuilt serial port. This works on chips with a 16550 compatible
218 UART. Xilinx chips with uartlite cannot use this option.
219
Scott Woodc374e002007-07-16 11:43:43 -0500220config PPC_EARLY_DEBUG_CPM
221 bool "Early serial debugging for Freescale CPM-based serial ports"
222 depends on SERIAL_CPM
223 select PIN_TLB if PPC_8xx
224 help
225 Select this to enable early debugging for Freescale chips
226 using a CPM-based serial port. This assumes that the bootwrapper
227 has run, and set up the CPM in a particular way.
228
Albert Herranzd1d56f82009-12-12 06:31:51 +0000229config PPC_EARLY_DEBUG_USBGECKO
230 bool "Early debugging through the USB Gecko adapter"
231 depends on GAMECUBE_COMMON
232 select USBGECKO_UDBG
233 help
234 Select this to enable early debugging for Nintendo GameCube/Wii
235 consoles via an external USB Gecko adapter.
236
Hector Martinc26afe92011-08-31 06:32:26 +0000237config PPC_EARLY_DEBUG_PS3GELIC
238 bool "Early debugging through the PS3 Ethernet port"
239 depends on PPC_PS3
240 select PS3GELIC_UDBG
241 help
242 Select this to enable early debugging for the PlayStation3 via
243 UDP broadcasts sent out through the Ethernet port.
244
Benjamin Herrenschmidtdaea1172011-09-19 17:44:59 +0000245config PPC_EARLY_DEBUG_OPAL_RAW
246 bool "OPAL raw console"
247 depends on HVC_OPAL
248 help
249 Select this to enable early debugging for the PowerNV platform
250 using a "raw" console
251
252config PPC_EARLY_DEBUG_OPAL_HVSI
253 bool "OPAL hvsi console"
254 depends on HVC_OPAL
255 help
256 Select this to enable early debugging for the PowerNV platform
257 using an "hvsi" console
258
Alistair Popple30650232013-04-29 18:07:47 +0000259config PPC_EARLY_DEBUG_MEMCONS
260 bool "In memory console"
261 help
262 Select this to enable early debugging using an in memory console.
263 This console provides input and output buffers stored within the
264 kernel BSS and should be safe to select on any system. A debugger
265 can then be used to read kernel output or send input to the console.
Michael Ellerman296167a2006-01-11 11:54:09 +1100266endchoice
267
Alistair Popple30650232013-04-29 18:07:47 +0000268config PPC_MEMCONS_OUTPUT_SIZE
269 int "In memory console output buffer size"
270 depends on PPC_EARLY_DEBUG_MEMCONS
271 default 4096
272 help
273 Selects the size of the output buffer (in bytes) of the in memory
274 console.
275
276config PPC_MEMCONS_INPUT_SIZE
277 int "In memory console input buffer size"
278 depends on PPC_EARLY_DEBUG_MEMCONS
279 default 128
280 help
281 Selects the size of the input buffer (in bytes) of the in memory
282 console.
283
Benjamin Herrenschmidtdaea1172011-09-19 17:44:59 +0000284config PPC_EARLY_DEBUG_OPAL
285 def_bool y
286 depends on PPC_EARLY_DEBUG_OPAL_RAW || PPC_EARLY_DEBUG_OPAL_HVSI
287
288
Benjamin Herrenschmidt4d2bb3f2011-05-12 13:46:38 +1000289config PPC_EARLY_DEBUG_HVSI_VTERMNO
290 hex "vterm number to use with early debug HVSI"
291 depends on PPC_EARLY_DEBUG_LPAR_HVSI
292 default "0x30000000"
293 help
294 You probably want 0x30000000 for your first serial port and
295 0x30000001 for your second one
296
Benjamin Herrenschmidtdaea1172011-09-19 17:44:59 +0000297config PPC_EARLY_DEBUG_OPAL_VTERMNO
298 hex "vterm number to use with OPAL early debug"
299 depends on PPC_EARLY_DEBUG_OPAL
300 default "0"
301 help
302 This correspond to which /dev/hvcN you want to use for early
303 debug.
304
Benjamin Herrenschmidtdaea1172011-09-19 17:44:59 +0000305 On OPAL v2, this will be 0 for network console and 1 or 2 for
306 the machine built-in serial ports.
307
David Gibsond9b55a02007-05-08 12:59:31 +1000308config PPC_EARLY_DEBUG_44x_PHYSLOW
309 hex "Low 32 bits of early debug UART physical address"
Adrian Bunk247537b2007-09-26 20:02:52 +0200310 depends on PPC_EARLY_DEBUG_44x
David Gibsond9b55a02007-05-08 12:59:31 +1000311 default "0x40000200"
Hugh Blemings6bbc5472007-12-21 15:39:28 +1100312 help
313 You probably want 0x40000200 for ebony boards and
314 0x40000300 for taishan
David Gibsond9b55a02007-05-08 12:59:31 +1000315
316config PPC_EARLY_DEBUG_44x_PHYSHIGH
317 hex "EPRN of early debug UART physical address"
Adrian Bunk247537b2007-09-26 20:02:52 +0200318 depends on PPC_EARLY_DEBUG_44x
David Gibsond9b55a02007-05-08 12:59:31 +1000319 default "0x1"
320
Benjamin Herrenschmidt9dae8af2007-12-21 15:39:26 +1100321config PPC_EARLY_DEBUG_40x_PHYSADDR
322 hex "Early debug UART physical address"
323 depends on PPC_EARLY_DEBUG_40x
324 default "0xef600300"
325
Scott Woodc374e002007-07-16 11:43:43 -0500326config PPC_EARLY_DEBUG_CPM_ADDR
327 hex "CPM UART early debug transmit descriptor address"
328 depends on PPC_EARLY_DEBUG_CPM
Scott Wood15f8c602007-09-28 14:06:16 -0500329 default "0xfa202008" if PPC_EP88XC
Laurent Pinchartc2dd3522008-04-10 17:01:59 +0200330 default "0xf0001ff8" if CPM2
Scott Wood15f8c602007-09-28 14:06:16 -0500331 default "0xff002008" if CPM1
Scott Woodc374e002007-07-16 11:43:43 -0500332 help
333 This specifies the address of the transmit descriptor
334 used for early debug output. Because it is needed before
335 platform probing is done, all platforms selected must
336 share the same address.
337
sukadev@linux.vnet.ibm.com1d54cf22011-08-30 09:19:17 +0000338config STRICT_DEVMEM
339 def_bool y
340 prompt "Filter access to /dev/mem"
341 help
342 This option restricts access to /dev/mem. If this option is
343 disabled, you allow userspace access to all memory, including
344 kernel and userspace memory. Accidental memory access is likely
345 to be disastrous.
346 Memory access is required for experts who want to debug the kernel.
347
348 If you are unsure, say Y.
349
Anton Blanchardd6b9a812012-06-24 18:26:17 +0000350config FAIL_IOMMU
351 bool "Fault-injection capability for IOMMU"
352 depends on FAULT_INJECTION
353 help
354 Provide fault-injection capability for IOMMU. Each device can
355 be selectively enabled via the fail_iommu property.
356
357 If you are unsure, say N.
358
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000359endmenu