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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
Johannes Bergc4d04be2008-11-20 03:24:07 +000022config PRINT_STACK_DEPTH
23 int "Stack depth to print" if DEBUG_KERNEL
24 default 64
25 help
26 This option allows you to set the stack depth that the kernel
27 prints in stack traces. This can be useful if your display is
28 too small and stack traces cause important information to
29 scroll off the screen.
30
Paul Mackerrasff642082005-10-10 22:15:52 +100031config DEBUG_STACKOVERFLOW
32 bool "Check for stack overflows"
Kumar Gala304df8f2007-01-30 00:45:56 -060033 depends on DEBUG_KERNEL
Paul Mackerrasff642082005-10-10 22:15:52 +100034 help
35 This option will cause messages to be printed if free stack space
36 drops below a certain limit.
37
Mike Kravetz57852a82006-09-06 16:23:12 -070038config HCALL_STATS
39 bool "Hypervisor call instrumentation"
Anton Blanchardc8cd0932009-10-26 18:50:29 +000040 depends on PPC_PSERIES && DEBUG_FS && TRACEPOINTS
Mike Kravetz57852a82006-09-06 16:23:12 -070041 help
42 Adds code to keep track of the number of hypervisor calls made and
David Sterba3dde6ad2007-05-09 07:12:20 +020043 the amount of time spent in hypervisor calls. Wall time spent in
Mike Kravetz57852a82006-09-06 16:23:12 -070044 each call is always calculated, and if available CPU cycles spent
45 are also calculated. A directory named hcall_inst is added at the
46 root of the debugfs filesystem. Within the hcall_inst directory
47 are files that contain CPU specific call statistics.
48
49 This option will add a small amount of overhead to all hypervisor
50 calls.
51
Geert Uytterhoeven80947e72009-05-18 02:10:05 +000052config PPC_EMULATED_STATS
53 bool "Emulated instructions tracking"
54 depends on DEBUG_FS
55 help
56 Adds code to keep track of the number of instructions that are
57 emulated by the in-kernel emulator. Counters for the various classes
58 of emulated instructions are available under
59 powerpc/emulated_instructions/ in the root of the debugfs file
60 system. Optionally (controlled by
61 powerpc/emulated_instructions/do_warn in debugfs), rate-limited
62 warnings can be printed to the console when instructions are
63 emulated.
64
Michael Ellermanae0dc732008-06-24 11:32:32 +100065config CODE_PATCHING_SELFTEST
66 bool "Run self-tests of the code-patching code."
67 depends on DEBUG_KERNEL
68 default n
69
Michael Ellerman362e7702008-06-24 11:33:03 +100070config FTR_FIXUP_SELFTEST
71 bool "Run self-tests of the feature-fixup code."
72 depends on DEBUG_KERNEL
73 default n
74
Michael Ellerman7e302862008-08-06 09:10:01 +100075config MSI_BITMAP_SELFTEST
76 bool "Run self-tests of the MSI bitmap code."
77 depends on DEBUG_KERNEL
78 default n
79
Paul Mackerras14cf11a2005-09-26 16:04:21 +100080config XMON
81 bool "Include xmon kernel debugger"
Jason Wessel17ce4522008-07-23 11:30:15 -050082 depends on DEBUG_KERNEL
Paul Mackerras14cf11a2005-09-26 16:04:21 +100083 help
84 Include in-kernel hooks for the xmon kernel monitor/debugger.
85 Unless you are intending to debug the kernel, say N here.
Paul Mackerrasff642082005-10-10 22:15:52 +100086 Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
87 nothing will appear on the screen (xmon writes directly to the
88 framebuffer memory).
89 The cmdline option 'xmon' or 'xmon=early' will drop into xmon
90 very early during boot. 'xmon=on' will just enable the xmon
91 debugger hooks. 'xmon=off' will disable the debugger hooks
92 if CONFIG_XMON_DEFAULT is set.
Olaf Hering26c8af52006-09-08 16:29:21 +020093 xmon will print a backtrace on the very first invocation.
94 'xmon=nobt' will disable this autobacktrace.
Paul Mackerrasff642082005-10-10 22:15:52 +100095
96config XMON_DEFAULT
97 bool "Enable xmon by default"
98 depends on XMON
99 help
100 xmon is normally disabled unless booted with 'xmon=on'.
101 Use 'xmon=off' to disable xmon init during runtime.
102
Michael Ellermane0426042006-11-23 00:46:45 +0100103config XMON_DISASSEMBLY
104 bool "Include disassembly support in xmon"
105 depends on XMON
106 default y
107 help
108 Include support for disassembling in xmon. You probably want
109 to say Y here, unless you're building for a memory-constrained
110 system.
111
Jason Wessel17ce4522008-07-23 11:30:15 -0500112config DEBUGGER
113 bool
114 depends on KGDB || XMON
115 default y
116
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000117config BDI_SWITCH
118 bool "Include BDI-2000 user context switcher"
Paul Mackerrasff642082005-10-10 22:15:52 +1000119 depends on DEBUG_KERNEL && PPC32
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000120 help
121 Include in-kernel support for the Abatron BDI2000 debugger.
122 Unless you are intending to debug the kernel with one of these
123 machines, say N here.
124
125config BOOTX_TEXT
126 bool "Support for early boot text console (BootX or OpenFirmware only)"
Benjamin Herrenschmidt28794d32009-03-10 17:53:27 +0000127 depends on PPC_OF && PPC_BOOK3S
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000128 help
129 Say Y here to see progress messages from the boot firmware in text
130 mode. Requires either BootX or Open Firmware.
131
Michael Ellerman485a2d52006-05-09 16:03:51 +1000132config PPC_EARLY_DEBUG
133 bool "Early debugging (dangerous)"
Benjamin Herrenschmidt7ee17462007-12-11 14:48:24 +1100134 help
135 Say Y to enable some early debugging facilities that may be available
136 for your processor/board combination. Those facilities are hacks
137 intended to debug problems early during boot, this should not be
138 enabled in a production kernel.
139 Note that enabling this will also cause the kernel default log level
140 to be pushed to max automatically very early during boot
Michael Ellerman485a2d52006-05-09 16:03:51 +1000141
Michael Ellerman296167a2006-01-11 11:54:09 +1100142choice
Michael Ellerman485a2d52006-05-09 16:03:51 +1000143 prompt "Early debugging console"
144 depends on PPC_EARLY_DEBUG
Michael Ellerman296167a2006-01-11 11:54:09 +1100145 help
Michael Ellerman485a2d52006-05-09 16:03:51 +1000146 Use the selected console for early debugging. Careful, if you
147 enable debugging for the wrong type of machine your kernel
148 _will not boot_.
Michael Ellerman296167a2006-01-11 11:54:09 +1100149
150config PPC_EARLY_DEBUG_LPAR
151 bool "LPAR HV Console"
152 depends on PPC_PSERIES
153 help
154 Select this to enable early debugging for a machine with a HVC
155 console on vterm 0.
156
Benjamin Herrenschmidt4d2bb3f2011-05-12 13:46:38 +1000157config PPC_EARLY_DEBUG_LPAR_HVSI
158 bool "LPAR HVSI Console"
159 depends on PPC_PSERIES
160 help
161 Select this to enable early debugging for a machine with a HVSI
162 console on a specified vterm.
163
Michael Ellerman296167a2006-01-11 11:54:09 +1100164config PPC_EARLY_DEBUG_G5
165 bool "Apple G5"
166 depends on PPC_PMAC64
167 help
168 Select this to enable early debugging for Apple G5 machines.
169
Michael Ellermancc46bb92006-06-23 18:20:16 +1000170config PPC_EARLY_DEBUG_RTAS_PANEL
Michael Ellerman296167a2006-01-11 11:54:09 +1100171 bool "RTAS Panel"
172 depends on PPC_RTAS
173 help
174 Select this to enable early debugging via the RTAS panel.
175
Michael Ellermancc46bb92006-06-23 18:20:16 +1000176config PPC_EARLY_DEBUG_RTAS_CONSOLE
177 bool "RTAS Console"
178 depends on PPC_RTAS
179 select UDBG_RTAS_CONSOLE
180 help
181 Select this to enable early debugging via the RTAS console.
182
Michael Ellerman296167a2006-01-11 11:54:09 +1100183config PPC_EARLY_DEBUG_MAPLE
184 bool "Maple real mode"
185 depends on PPC_MAPLE
186 help
187 Select this to enable early debugging for Maple.
188
Olof Johansson39c870d2007-02-04 16:36:49 -0600189config PPC_EARLY_DEBUG_PAS_REALMODE
190 bool "PA Semi real mode"
191 depends on PPC_PASEMI
192 help
193 Select this to enable early debugging for PA Semi.
194 Output will be on UART0.
195
Ishizaki Kouc347b792007-02-02 16:47:17 +0900196config PPC_EARLY_DEBUG_BEAT
197 bool "Beat HV Console"
198 depends on PPC_CELLEB
199 select PPC_UDBG_BEAT
200 help
201 Select this to enable early debugging for Celleb with Beat.
202
David Gibsond9b55a02007-05-08 12:59:31 +1000203config PPC_EARLY_DEBUG_44x
204 bool "Early serial debugging for IBM/AMCC 44x CPUs"
Benjamin Herrenschmidtb8bb9222011-09-19 17:44:48 +0000205 # PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water
206 # mark, which doesn't work with current 440 KVM.
207 depends on 44x && !KVM
David Gibsond9b55a02007-05-08 12:59:31 +1000208 help
209 Select this to enable early debugging for IBM 44x chips via the
Hugh Blemings6bbc5472007-12-21 15:39:28 +1100210 inbuilt serial port. If you enable this, ensure you set
211 PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.
David Gibsond9b55a02007-05-08 12:59:31 +1000212
Benjamin Herrenschmidt9dae8af2007-12-21 15:39:26 +1100213config PPC_EARLY_DEBUG_40x
214 bool "Early serial debugging for IBM/AMCC 40x CPUs"
215 depends on 40x
216 help
217 Select this to enable early debugging for IBM 40x chips via the
218 inbuilt serial port. This works on chips with a 16550 compatible
219 UART. Xilinx chips with uartlite cannot use this option.
220
Scott Woodc374e002007-07-16 11:43:43 -0500221config PPC_EARLY_DEBUG_CPM
222 bool "Early serial debugging for Freescale CPM-based serial ports"
223 depends on SERIAL_CPM
224 select PIN_TLB if PPC_8xx
225 help
226 Select this to enable early debugging for Freescale chips
227 using a CPM-based serial port. This assumes that the bootwrapper
228 has run, and set up the CPM in a particular way.
229
Albert Herranzd1d56f82009-12-12 06:31:51 +0000230config PPC_EARLY_DEBUG_USBGECKO
231 bool "Early debugging through the USB Gecko adapter"
232 depends on GAMECUBE_COMMON
233 select USBGECKO_UDBG
234 help
235 Select this to enable early debugging for Nintendo GameCube/Wii
236 consoles via an external USB Gecko adapter.
237
Jack Millera0496d42011-04-14 22:32:08 +0000238config PPC_EARLY_DEBUG_WSP
239 bool "Early debugging via WSP's internal UART"
240 depends on PPC_WSP
241 select PPC_UDBG_16550
242
Hector Martinc26afe92011-08-31 06:32:26 +0000243config PPC_EARLY_DEBUG_PS3GELIC
244 bool "Early debugging through the PS3 Ethernet port"
245 depends on PPC_PS3
246 select PS3GELIC_UDBG
247 help
248 Select this to enable early debugging for the PlayStation3 via
249 UDP broadcasts sent out through the Ethernet port.
250
Benjamin Herrenschmidtdaea1172011-09-19 17:44:59 +0000251config PPC_EARLY_DEBUG_OPAL_RAW
252 bool "OPAL raw console"
253 depends on HVC_OPAL
254 help
255 Select this to enable early debugging for the PowerNV platform
256 using a "raw" console
257
258config PPC_EARLY_DEBUG_OPAL_HVSI
259 bool "OPAL hvsi console"
260 depends on HVC_OPAL
261 help
262 Select this to enable early debugging for the PowerNV platform
263 using an "hvsi" console
264
Michael Ellerman296167a2006-01-11 11:54:09 +1100265endchoice
266
Benjamin Herrenschmidtdaea1172011-09-19 17:44:59 +0000267config PPC_EARLY_DEBUG_OPAL
268 def_bool y
269 depends on PPC_EARLY_DEBUG_OPAL_RAW || PPC_EARLY_DEBUG_OPAL_HVSI
270
271
Benjamin Herrenschmidt4d2bb3f2011-05-12 13:46:38 +1000272config PPC_EARLY_DEBUG_HVSI_VTERMNO
273 hex "vterm number to use with early debug HVSI"
274 depends on PPC_EARLY_DEBUG_LPAR_HVSI
275 default "0x30000000"
276 help
277 You probably want 0x30000000 for your first serial port and
278 0x30000001 for your second one
279
Benjamin Herrenschmidtdaea1172011-09-19 17:44:59 +0000280config PPC_EARLY_DEBUG_OPAL_VTERMNO
281 hex "vterm number to use with OPAL early debug"
282 depends on PPC_EARLY_DEBUG_OPAL
283 default "0"
284 help
285 This correspond to which /dev/hvcN you want to use for early
286 debug.
287
288 On OPAL v1 (takeover) this should always be 0
289 On OPAL v2, this will be 0 for network console and 1 or 2 for
290 the machine built-in serial ports.
291
David Gibsond9b55a02007-05-08 12:59:31 +1000292config PPC_EARLY_DEBUG_44x_PHYSLOW
293 hex "Low 32 bits of early debug UART physical address"
Adrian Bunk247537b2007-09-26 20:02:52 +0200294 depends on PPC_EARLY_DEBUG_44x
David Gibsond9b55a02007-05-08 12:59:31 +1000295 default "0x40000200"
Hugh Blemings6bbc5472007-12-21 15:39:28 +1100296 help
297 You probably want 0x40000200 for ebony boards and
298 0x40000300 for taishan
David Gibsond9b55a02007-05-08 12:59:31 +1000299
300config PPC_EARLY_DEBUG_44x_PHYSHIGH
301 hex "EPRN of early debug UART physical address"
Adrian Bunk247537b2007-09-26 20:02:52 +0200302 depends on PPC_EARLY_DEBUG_44x
David Gibsond9b55a02007-05-08 12:59:31 +1000303 default "0x1"
304
Benjamin Herrenschmidt9dae8af2007-12-21 15:39:26 +1100305config PPC_EARLY_DEBUG_40x_PHYSADDR
306 hex "Early debug UART physical address"
307 depends on PPC_EARLY_DEBUG_40x
308 default "0xef600300"
309
Scott Woodc374e002007-07-16 11:43:43 -0500310config PPC_EARLY_DEBUG_CPM_ADDR
311 hex "CPM UART early debug transmit descriptor address"
312 depends on PPC_EARLY_DEBUG_CPM
Scott Wood15f8c602007-09-28 14:06:16 -0500313 default "0xfa202008" if PPC_EP88XC
Laurent Pinchartc2dd3522008-04-10 17:01:59 +0200314 default "0xf0001ff8" if CPM2
Scott Wood15f8c602007-09-28 14:06:16 -0500315 default "0xff002008" if CPM1
Scott Woodc374e002007-07-16 11:43:43 -0500316 help
317 This specifies the address of the transmit descriptor
318 used for early debug output. Because it is needed before
319 platform probing is done, all platforms selected must
320 share the same address.
321
sukadev@linux.vnet.ibm.com1d54cf22011-08-30 09:19:17 +0000322config STRICT_DEVMEM
323 def_bool y
324 prompt "Filter access to /dev/mem"
325 help
326 This option restricts access to /dev/mem. If this option is
327 disabled, you allow userspace access to all memory, including
328 kernel and userspace memory. Accidental memory access is likely
329 to be disastrous.
330 Memory access is required for experts who want to debug the kernel.
331
332 If you are unsure, say Y.
333
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000334endmenu