1# SPDX-License-Identifier: GPL-2.0 2menu "Kernel hacking" 3 4source "lib/Kconfig.debug" 5 6config PPC_DISABLE_WERROR 7 bool "Don't build arch/powerpc code with -Werror" 8 default n 9 help 10 This option tells the compiler NOT to build the code under 11 arch/powerpc with the -Werror flag (which means warnings 12 are treated as errors). 13 14 Only enable this if you are hitting a build failure in the 15 arch/powerpc code caused by a warning, and you don't feel 16 inclined to fix it. 17 18config PPC_WERROR 19 bool 20 depends on !PPC_DISABLE_WERROR 21 default y 22 23config PRINT_STACK_DEPTH 24 int "Stack depth to print" if DEBUG_KERNEL 25 default 64 26 help 27 This option allows you to set the stack depth that the kernel 28 prints in stack traces. This can be useful if your display is 29 too small and stack traces cause important information to 30 scroll off the screen. 31 32config HCALL_STATS 33 bool "Hypervisor call instrumentation" 34 depends on PPC_PSERIES && DEBUG_FS && TRACEPOINTS 35 help 36 Adds code to keep track of the number of hypervisor calls made and 37 the amount of time spent in hypervisor calls. Wall time spent in 38 each call is always calculated, and if available CPU cycles spent 39 are also calculated. A directory named hcall_inst is added at the 40 root of the debugfs filesystem. Within the hcall_inst directory 41 are files that contain CPU specific call statistics. 42 43 This option will add a small amount of overhead to all hypervisor 44 calls. 45 46config PPC_EMULATED_STATS 47 bool "Emulated instructions tracking" 48 depends on DEBUG_FS 49 help 50 Adds code to keep track of the number of instructions that are 51 emulated by the in-kernel emulator. Counters for the various classes 52 of emulated instructions are available under 53 powerpc/emulated_instructions/ in the root of the debugfs file 54 system. Optionally (controlled by 55 powerpc/emulated_instructions/do_warn in debugfs), rate-limited 56 warnings can be printed to the console when instructions are 57 emulated. 58 59config CODE_PATCHING_SELFTEST 60 bool "Run self-tests of the code-patching code" 61 depends on DEBUG_KERNEL 62 default n 63 64config JUMP_LABEL_FEATURE_CHECKS 65 bool "Enable use of jump label for cpu/mmu_has_feature()" 66 depends on JUMP_LABEL 67 default y 68 help 69 Selecting this options enables use of jump labels for some internal 70 feature checks. This should generate more optimal code for those 71 checks. 72 73config JUMP_LABEL_FEATURE_CHECK_DEBUG 74 bool "Do extra check on feature fixup calls" 75 depends on DEBUG_KERNEL && JUMP_LABEL_FEATURE_CHECKS 76 default n 77 help 78 This tries to catch incorrect usage of cpu_has_feature() and 79 mmu_has_feature() in the code. 80 81 If you don't know what this means, say N. 82 83config FTR_FIXUP_SELFTEST 84 bool "Run self-tests of the feature-fixup code" 85 depends on DEBUG_KERNEL 86 default n 87 88config MSI_BITMAP_SELFTEST 89 bool "Run self-tests of the MSI bitmap code" 90 depends on DEBUG_KERNEL 91 default n 92 93config XMON 94 bool "Include xmon kernel debugger" 95 depends on DEBUG_KERNEL 96 help 97 Include in-kernel hooks for the xmon kernel monitor/debugger. 98 Unless you are intending to debug the kernel, say N here. 99 Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise 100 nothing will appear on the screen (xmon writes directly to the 101 framebuffer memory). 102 The cmdline option 'xmon' or 'xmon=early' will drop into xmon 103 very early during boot. 'xmon=on' will just enable the xmon 104 debugger hooks. 'xmon=off' will disable the debugger hooks 105 if CONFIG_XMON_DEFAULT is set. 106 xmon will print a backtrace on the very first invocation. 107 'xmon=nobt' will disable this autobacktrace. 108 109config XMON_DEFAULT 110 bool "Enable xmon by default" 111 depends on XMON 112 help 113 xmon is normally disabled unless booted with 'xmon=on'. 114 Use 'xmon=off' to disable xmon init during runtime. 115 116config XMON_DISASSEMBLY 117 bool "Include disassembly support in xmon" 118 depends on XMON 119 default y 120 help 121 Include support for disassembling in xmon. You probably want 122 to say Y here, unless you're building for a memory-constrained 123 system. 124 125config DEBUGGER 126 bool 127 depends on KGDB || XMON 128 default y 129 130config BDI_SWITCH 131 bool "Include BDI-2000 user context switcher" 132 depends on DEBUG_KERNEL && PPC32 133 help 134 Include in-kernel support for the Abatron BDI2000 debugger. 135 Unless you are intending to debug the kernel with one of these 136 machines, say N here. 137 138config BOOTX_TEXT 139 bool "Support for early boot text console (BootX or OpenFirmware only)" 140 depends on PPC_BOOK3S 141 help 142 Say Y here to see progress messages from the boot firmware in text 143 mode. Requires either BootX or Open Firmware. 144 145config PPC_EARLY_DEBUG 146 bool "Early debugging (dangerous)" 147 help 148 Say Y to enable some early debugging facilities that may be available 149 for your processor/board combination. Those facilities are hacks 150 intended to debug problems early during boot, this should not be 151 enabled in a production kernel. 152 Note that enabling this will also cause the kernel default log level 153 to be pushed to max automatically very early during boot 154 155choice 156 prompt "Early debugging console" 157 depends on PPC_EARLY_DEBUG 158 help 159 Use the selected console for early debugging. Careful, if you 160 enable debugging for the wrong type of machine your kernel 161 _will not boot_. 162 163config PPC_EARLY_DEBUG_BOOTX 164 bool "BootX or OpenFirmware" 165 depends on BOOTX_TEXT 166 help 167 Select this to enable early debugging for a machine using BootX 168 or OpenFirmware. 169 170config PPC_EARLY_DEBUG_LPAR 171 bool "LPAR HV Console" 172 depends on PPC_PSERIES && HVC_CONSOLE 173 help 174 Select this to enable early debugging for a machine with a HVC 175 console on vterm 0. 176 177config PPC_EARLY_DEBUG_LPAR_HVSI 178 bool "LPAR HVSI Console" 179 depends on PPC_PSERIES && HVC_CONSOLE 180 help 181 Select this to enable early debugging for a machine with a HVSI 182 console on a specified vterm. 183 184config PPC_EARLY_DEBUG_G5 185 bool "Apple G5" 186 depends on PPC_PMAC64 187 help 188 Select this to enable early debugging for Apple G5 machines. 189 190config PPC_EARLY_DEBUG_RTAS_PANEL 191 bool "RTAS Panel" 192 depends on PPC_RTAS 193 help 194 Select this to enable early debugging via the RTAS panel. 195 196config PPC_EARLY_DEBUG_RTAS_CONSOLE 197 bool "RTAS Console" 198 depends on PPC_RTAS 199 select UDBG_RTAS_CONSOLE 200 help 201 Select this to enable early debugging via the RTAS console. 202 203config PPC_EARLY_DEBUG_MAPLE 204 bool "Maple real mode" 205 depends on PPC_MAPLE 206 help 207 Select this to enable early debugging for Maple. 208 209config PPC_EARLY_DEBUG_PAS_REALMODE 210 bool "PA Semi real mode" 211 depends on PPC_PASEMI 212 help 213 Select this to enable early debugging for PA Semi. 214 Output will be on UART0. 215 216config PPC_EARLY_DEBUG_44x 217 bool "Early serial debugging for IBM/AMCC 44x CPUs" 218 depends on 44x 219 help 220 Select this to enable early debugging for IBM 44x chips via the 221 inbuilt serial port. If you enable this, ensure you set 222 PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board. 223 224config PPC_EARLY_DEBUG_40x 225 bool "Early serial debugging for IBM/AMCC 40x CPUs" 226 depends on 40x 227 help 228 Select this to enable early debugging for IBM 40x chips via the 229 inbuilt serial port. This works on chips with a 16550 compatible 230 UART. Xilinx chips with uartlite cannot use this option. 231 232config PPC_EARLY_DEBUG_CPM 233 bool "Early serial debugging for Freescale CPM-based serial ports" 234 depends on SERIAL_CPM 235 help 236 Select this to enable early debugging for Freescale chips 237 using a CPM-based serial port. This assumes that the bootwrapper 238 has run, and set up the CPM in a particular way. 239 240config PPC_EARLY_DEBUG_USBGECKO 241 bool "Early debugging through the USB Gecko adapter" 242 depends on GAMECUBE_COMMON 243 select USBGECKO_UDBG 244 help 245 Select this to enable early debugging for Nintendo GameCube/Wii 246 consoles via an external USB Gecko adapter. 247 248config PPC_EARLY_DEBUG_PS3GELIC 249 bool "Early debugging through the PS3 Ethernet port" 250 depends on PPC_PS3 251 select PS3GELIC_UDBG 252 help 253 Select this to enable early debugging for the PlayStation3 via 254 UDP broadcasts sent out through the Ethernet port. 255 256config PPC_EARLY_DEBUG_OPAL_RAW 257 bool "OPAL raw console" 258 depends on HVC_OPAL 259 help 260 Select this to enable early debugging for the PowerNV platform 261 using a "raw" console 262 263config PPC_EARLY_DEBUG_OPAL_HVSI 264 bool "OPAL hvsi console" 265 depends on HVC_OPAL 266 help 267 Select this to enable early debugging for the PowerNV platform 268 using an "hvsi" console 269 270config PPC_EARLY_DEBUG_MEMCONS 271 bool "In memory console" 272 help 273 Select this to enable early debugging using an in memory console. 274 This console provides input and output buffers stored within the 275 kernel BSS and should be safe to select on any system. A debugger 276 can then be used to read kernel output or send input to the console. 277endchoice 278 279config PPC_MEMCONS_OUTPUT_SIZE 280 int "In memory console output buffer size" 281 depends on PPC_EARLY_DEBUG_MEMCONS 282 default 4096 283 help 284 Selects the size of the output buffer (in bytes) of the in memory 285 console. 286 287config PPC_MEMCONS_INPUT_SIZE 288 int "In memory console input buffer size" 289 depends on PPC_EARLY_DEBUG_MEMCONS 290 default 128 291 help 292 Selects the size of the input buffer (in bytes) of the in memory 293 console. 294 295config PPC_EARLY_DEBUG_OPAL 296 def_bool y 297 depends on PPC_EARLY_DEBUG_OPAL_RAW || PPC_EARLY_DEBUG_OPAL_HVSI 298 299 300config PPC_EARLY_DEBUG_HVSI_VTERMNO 301 hex "vterm number to use with early debug HVSI" 302 depends on PPC_EARLY_DEBUG_LPAR_HVSI 303 default "0x30000000" 304 help 305 You probably want 0x30000000 for your first serial port and 306 0x30000001 for your second one 307 308config PPC_EARLY_DEBUG_OPAL_VTERMNO 309 hex "vterm number to use with OPAL early debug" 310 depends on PPC_EARLY_DEBUG_OPAL 311 default "0" 312 help 313 This correspond to which /dev/hvcN you want to use for early 314 debug. 315 316 On OPAL v2, this will be 0 for network console and 1 or 2 for 317 the machine built-in serial ports. 318 319config PPC_EARLY_DEBUG_44x_PHYSLOW 320 hex "Low 32 bits of early debug UART physical address" 321 depends on PPC_EARLY_DEBUG_44x 322 default "0x40000200" 323 help 324 You probably want 0x40000200 for ebony boards and 325 0x40000300 for taishan 326 327config PPC_EARLY_DEBUG_44x_PHYSHIGH 328 hex "EPRN of early debug UART physical address" 329 depends on PPC_EARLY_DEBUG_44x 330 default "0x1" 331 332config PPC_EARLY_DEBUG_40x_PHYSADDR 333 hex "Early debug UART physical address" 334 depends on PPC_EARLY_DEBUG_40x 335 default "0xef600300" 336 337config PPC_EARLY_DEBUG_CPM_ADDR 338 hex "CPM UART early debug transmit descriptor address" 339 depends on PPC_EARLY_DEBUG_CPM 340 default "0xfa202008" if PPC_EP88XC 341 default "0xf0001ff8" if CPM2 342 default "0xff002008" if CPM1 343 help 344 This specifies the address of the transmit descriptor 345 used for early debug output. Because it is needed before 346 platform probing is done, all platforms selected must 347 share the same address. 348 349config FAIL_IOMMU 350 bool "Fault-injection capability for IOMMU" 351 depends on FAULT_INJECTION 352 help 353 Provide fault-injection capability for IOMMU. Each device can 354 be selectively enabled via the fail_iommu property. 355 356 If you are unsure, say N. 357 358config PPC_PTDUMP 359 bool "Export kernel pagetable layout to userspace via debugfs" 360 depends on DEBUG_KERNEL && DEBUG_FS 361 help 362 This option exports the state of the kernel pagetables to a 363 debugfs file. This is only useful for kernel developers who are 364 working in architecture specific areas of the kernel - probably 365 not a good idea to enable this feature in a production kernel. 366 367 If you are unsure, say N. 368 369config PPC_HTDUMP 370 def_bool y 371 depends on PPC_PTDUMP && PPC_BOOK3S 372 373endmenu 374