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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
Paul Mackerrasff642082005-10-10 22:15:52 +100038config DEBUG_STACK_USAGE
39 bool "Stack utilization instrumentation"
Kumar Gala304df8f2007-01-30 00:45:56 -060040 depends on DEBUG_KERNEL
Paul Mackerrasff642082005-10-10 22:15:52 +100041 help
42 Enables the display of the minimum amount of free stack which each
43 task has ever had available in the sysrq-T and sysrq-P debug output.
44
45 This option will slow down process creation somewhat.
46
Anton Blanchardceba1ab2010-04-26 15:32:46 +000047config DEBUG_PER_CPU_MAPS
48 bool "Debug access to per_cpu maps"
49 depends on DEBUG_KERNEL
50 depends on SMP
51 default n
52 ---help---
53 Say Y to verify that the per_cpu map being accessed has
54 been setup. Adds a fair amount of code to kernel memory
55 and decreases performance.
56
57 Say N if unsure.
58
Mike Kravetz57852a82006-09-06 16:23:12 -070059config HCALL_STATS
60 bool "Hypervisor call instrumentation"
Anton Blanchardc8cd0932009-10-26 18:50:29 +000061 depends on PPC_PSERIES && DEBUG_FS && TRACEPOINTS
Mike Kravetz57852a82006-09-06 16:23:12 -070062 help
63 Adds code to keep track of the number of hypervisor calls made and
David Sterba3dde6ad2007-05-09 07:12:20 +020064 the amount of time spent in hypervisor calls. Wall time spent in
Mike Kravetz57852a82006-09-06 16:23:12 -070065 each call is always calculated, and if available CPU cycles spent
66 are also calculated. A directory named hcall_inst is added at the
67 root of the debugfs filesystem. Within the hcall_inst directory
68 are files that contain CPU specific call statistics.
69
70 This option will add a small amount of overhead to all hypervisor
71 calls.
72
Geert Uytterhoeven80947e72009-05-18 02:10:05 +000073config PPC_EMULATED_STATS
74 bool "Emulated instructions tracking"
75 depends on DEBUG_FS
76 help
77 Adds code to keep track of the number of instructions that are
78 emulated by the in-kernel emulator. Counters for the various classes
79 of emulated instructions are available under
80 powerpc/emulated_instructions/ in the root of the debugfs file
81 system. Optionally (controlled by
82 powerpc/emulated_instructions/do_warn in debugfs), rate-limited
83 warnings can be printed to the console when instructions are
84 emulated.
85
Michael Ellermanae0dc732008-06-24 11:32:32 +100086config CODE_PATCHING_SELFTEST
87 bool "Run self-tests of the code-patching code."
88 depends on DEBUG_KERNEL
89 default n
90
Michael Ellerman362e7702008-06-24 11:33:03 +100091config FTR_FIXUP_SELFTEST
92 bool "Run self-tests of the feature-fixup code."
93 depends on DEBUG_KERNEL
94 default n
95
Michael Ellerman7e302862008-08-06 09:10:01 +100096config MSI_BITMAP_SELFTEST
97 bool "Run self-tests of the MSI bitmap code."
98 depends on DEBUG_KERNEL
99 default n
100
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000101config XMON
102 bool "Include xmon kernel debugger"
Jason Wessel17ce4522008-07-23 11:30:15 -0500103 depends on DEBUG_KERNEL
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000104 help
105 Include in-kernel hooks for the xmon kernel monitor/debugger.
106 Unless you are intending to debug the kernel, say N here.
Paul Mackerrasff642082005-10-10 22:15:52 +1000107 Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
108 nothing will appear on the screen (xmon writes directly to the
109 framebuffer memory).
110 The cmdline option 'xmon' or 'xmon=early' will drop into xmon
111 very early during boot. 'xmon=on' will just enable the xmon
112 debugger hooks. 'xmon=off' will disable the debugger hooks
113 if CONFIG_XMON_DEFAULT is set.
Olaf Hering26c8af52006-09-08 16:29:21 +0200114 xmon will print a backtrace on the very first invocation.
115 'xmon=nobt' will disable this autobacktrace.
Paul Mackerrasff642082005-10-10 22:15:52 +1000116
117config XMON_DEFAULT
118 bool "Enable xmon by default"
119 depends on XMON
120 help
121 xmon is normally disabled unless booted with 'xmon=on'.
122 Use 'xmon=off' to disable xmon init during runtime.
123
Michael Ellermane0426042006-11-23 00:46:45 +0100124config XMON_DISASSEMBLY
125 bool "Include disassembly support in xmon"
126 depends on XMON
127 default y
128 help
129 Include support for disassembling in xmon. You probably want
130 to say Y here, unless you're building for a memory-constrained
131 system.
132
Jason Wessel17ce4522008-07-23 11:30:15 -0500133config DEBUGGER
134 bool
135 depends on KGDB || XMON
136 default y
137
Paul Mackerrasff642082005-10-10 22:15:52 +1000138config IRQSTACKS
139 bool "Use separate kernel stacks when processing interrupts"
Paul Mackerrasff642082005-10-10 22:15:52 +1000140 help
141 If you say Y here the kernel will use separate kernel stacks
142 for handling hard and soft interrupts. This can help avoid
143 overflowing the process kernel stacks.
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000144
Michael Ellerman60b332e2007-08-28 18:47:57 +1000145config VIRQ_DEBUG
146 bool "Expose hardware/virtual IRQ mapping via debugfs"
Kumar Gala9c4cb822008-08-02 02:44:11 +1000147 depends on DEBUG_FS
Michael Ellerman60b332e2007-08-28 18:47:57 +1000148 help
149 This option will show the mapping relationship between hardware irq
150 numbers and virtual irq numbers. The mapping is exposed via debugfs
151 in the file powerpc/virq_mapping.
152
153 If you don't know what this means you don't need it.
154
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000155config BDI_SWITCH
156 bool "Include BDI-2000 user context switcher"
Paul Mackerrasff642082005-10-10 22:15:52 +1000157 depends on DEBUG_KERNEL && PPC32
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000158 help
159 Include in-kernel support for the Abatron BDI2000 debugger.
160 Unless you are intending to debug the kernel with one of these
161 machines, say N here.
162
163config BOOTX_TEXT
164 bool "Support for early boot text console (BootX or OpenFirmware only)"
Benjamin Herrenschmidt28794d32009-03-10 17:53:27 +0000165 depends on PPC_OF && PPC_BOOK3S
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000166 help
167 Say Y here to see progress messages from the boot firmware in text
168 mode. Requires either BootX or Open Firmware.
169
Michael Ellerman485a2d52006-05-09 16:03:51 +1000170config PPC_EARLY_DEBUG
171 bool "Early debugging (dangerous)"
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -0500172 # PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water
173 # mark, which doesn't work with current 440 KVM.
174 depends on !KVM
Benjamin Herrenschmidt7ee17462007-12-11 14:48:24 +1100175 help
176 Say Y to enable some early debugging facilities that may be available
177 for your processor/board combination. Those facilities are hacks
178 intended to debug problems early during boot, this should not be
179 enabled in a production kernel.
180 Note that enabling this will also cause the kernel default log level
181 to be pushed to max automatically very early during boot
Michael Ellerman485a2d52006-05-09 16:03:51 +1000182
Michael Ellerman296167a2006-01-11 11:54:09 +1100183choice
Michael Ellerman485a2d52006-05-09 16:03:51 +1000184 prompt "Early debugging console"
185 depends on PPC_EARLY_DEBUG
Michael Ellerman296167a2006-01-11 11:54:09 +1100186 help
Michael Ellerman485a2d52006-05-09 16:03:51 +1000187 Use the selected console for early debugging. Careful, if you
188 enable debugging for the wrong type of machine your kernel
189 _will not boot_.
Michael Ellerman296167a2006-01-11 11:54:09 +1100190
191config PPC_EARLY_DEBUG_LPAR
192 bool "LPAR HV Console"
193 depends on PPC_PSERIES
194 help
195 Select this to enable early debugging for a machine with a HVC
196 console on vterm 0.
197
198config PPC_EARLY_DEBUG_G5
199 bool "Apple G5"
200 depends on PPC_PMAC64
201 help
202 Select this to enable early debugging for Apple G5 machines.
203
Michael Ellermancc46bb92006-06-23 18:20:16 +1000204config PPC_EARLY_DEBUG_RTAS_PANEL
Michael Ellerman296167a2006-01-11 11:54:09 +1100205 bool "RTAS Panel"
206 depends on PPC_RTAS
207 help
208 Select this to enable early debugging via the RTAS panel.
209
Michael Ellermancc46bb92006-06-23 18:20:16 +1000210config PPC_EARLY_DEBUG_RTAS_CONSOLE
211 bool "RTAS Console"
212 depends on PPC_RTAS
213 select UDBG_RTAS_CONSOLE
214 help
215 Select this to enable early debugging via the RTAS console.
216
Michael Ellerman296167a2006-01-11 11:54:09 +1100217config PPC_EARLY_DEBUG_MAPLE
218 bool "Maple real mode"
219 depends on PPC_MAPLE
220 help
221 Select this to enable early debugging for Maple.
222
223config PPC_EARLY_DEBUG_ISERIES
224 bool "iSeries HV Console"
225 depends on PPC_ISERIES
226 help
227 Select this to enable early debugging for legacy iSeries. You need
228 to hit "Ctrl-x Ctrl-x" to see the messages on the console.
229
Olof Johansson39c870d2007-02-04 16:36:49 -0600230config PPC_EARLY_DEBUG_PAS_REALMODE
231 bool "PA Semi real mode"
232 depends on PPC_PASEMI
233 help
234 Select this to enable early debugging for PA Semi.
235 Output will be on UART0.
236
Ishizaki Kouc347b792007-02-02 16:47:17 +0900237config PPC_EARLY_DEBUG_BEAT
238 bool "Beat HV Console"
239 depends on PPC_CELLEB
240 select PPC_UDBG_BEAT
241 help
242 Select this to enable early debugging for Celleb with Beat.
243
David Gibsond9b55a02007-05-08 12:59:31 +1000244config PPC_EARLY_DEBUG_44x
245 bool "Early serial debugging for IBM/AMCC 44x CPUs"
246 depends on 44x
David Gibsond9b55a02007-05-08 12:59:31 +1000247 help
248 Select this to enable early debugging for IBM 44x chips via the
Hugh Blemings6bbc5472007-12-21 15:39:28 +1100249 inbuilt serial port. If you enable this, ensure you set
250 PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.
David Gibsond9b55a02007-05-08 12:59:31 +1000251
Benjamin Herrenschmidt9dae8af2007-12-21 15:39:26 +1100252config PPC_EARLY_DEBUG_40x
253 bool "Early serial debugging for IBM/AMCC 40x CPUs"
254 depends on 40x
255 help
256 Select this to enable early debugging for IBM 40x chips via the
257 inbuilt serial port. This works on chips with a 16550 compatible
258 UART. Xilinx chips with uartlite cannot use this option.
259
Scott Woodc374e002007-07-16 11:43:43 -0500260config PPC_EARLY_DEBUG_CPM
261 bool "Early serial debugging for Freescale CPM-based serial ports"
262 depends on SERIAL_CPM
263 select PIN_TLB if PPC_8xx
264 help
265 Select this to enable early debugging for Freescale chips
266 using a CPM-based serial port. This assumes that the bootwrapper
267 has run, and set up the CPM in a particular way.
268
Albert Herranzd1d56f82009-12-12 06:31:51 +0000269config PPC_EARLY_DEBUG_USBGECKO
270 bool "Early debugging through the USB Gecko adapter"
271 depends on GAMECUBE_COMMON
272 select USBGECKO_UDBG
273 help
274 Select this to enable early debugging for Nintendo GameCube/Wii
275 consoles via an external USB Gecko adapter.
276
Michael Ellerman296167a2006-01-11 11:54:09 +1100277endchoice
278
David Gibsond9b55a02007-05-08 12:59:31 +1000279config PPC_EARLY_DEBUG_44x_PHYSLOW
280 hex "Low 32 bits of early debug UART physical address"
Adrian Bunk247537b2007-09-26 20:02:52 +0200281 depends on PPC_EARLY_DEBUG_44x
David Gibsond9b55a02007-05-08 12:59:31 +1000282 default "0x40000200"
Hugh Blemings6bbc5472007-12-21 15:39:28 +1100283 help
284 You probably want 0x40000200 for ebony boards and
285 0x40000300 for taishan
David Gibsond9b55a02007-05-08 12:59:31 +1000286
287config PPC_EARLY_DEBUG_44x_PHYSHIGH
288 hex "EPRN of early debug UART physical address"
Adrian Bunk247537b2007-09-26 20:02:52 +0200289 depends on PPC_EARLY_DEBUG_44x
David Gibsond9b55a02007-05-08 12:59:31 +1000290 default "0x1"
291
Benjamin Herrenschmidt9dae8af2007-12-21 15:39:26 +1100292config PPC_EARLY_DEBUG_40x_PHYSADDR
293 hex "Early debug UART physical address"
294 depends on PPC_EARLY_DEBUG_40x
295 default "0xef600300"
296
Scott Woodc374e002007-07-16 11:43:43 -0500297config PPC_EARLY_DEBUG_CPM_ADDR
298 hex "CPM UART early debug transmit descriptor address"
299 depends on PPC_EARLY_DEBUG_CPM
Scott Wood15f8c602007-09-28 14:06:16 -0500300 default "0xfa202008" if PPC_EP88XC
Laurent Pinchartc2dd3522008-04-10 17:01:59 +0200301 default "0xf0001ff8" if CPM2
Scott Wood15f8c602007-09-28 14:06:16 -0500302 default "0xff002008" if CPM1
Scott Woodc374e002007-07-16 11:43:43 -0500303 help
304 This specifies the address of the transmit descriptor
305 used for early debug output. Because it is needed before
306 platform probing is done, all platforms selected must
307 share the same address.
308
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000309endmenu