arch/powerpc/Kconfig.debug

   1 # SPDX-License-Identifier: GPL-2.0
   2 menu "Kernel hacking"
   3
   4 source "lib/Kconfig.debug"
   5
   6 config 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
  18 config PPC_WERROR
  19         bool
  20         depends on !PPC_DISABLE_WERROR
  21         default y
  22
  23 config 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
  32 config 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
  46 config 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
  59 config CODE_PATCHING_SELFTEST
  60         bool "Run self-tests of the code-patching code"
  61         depends on DEBUG_KERNEL
  62         default n
  63
  64 config 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
  73 config 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
  83 config FTR_FIXUP_SELFTEST
  84         bool "Run self-tests of the feature-fixup code"
  85         depends on DEBUG_KERNEL
  86         default n
  87
  88 config MSI_BITMAP_SELFTEST
  89         bool "Run self-tests of the MSI bitmap code"
  90         depends on DEBUG_KERNEL
  91         default n
  92
  93 config 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
 109 config 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
 116 config 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
 125 config DEBUGGER
 126         bool
 127         depends on KGDB || XMON
 128         default y
 129
 130 config 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
 138 config 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
 145 config 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
 155 choice
 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
 163 config 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
 170 config 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
 177 config 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
 184 config 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
 190 config 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
 196 config 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
 203 config 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
 209 config 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
 216 config 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
 224 config 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
 232 config 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
 240 config 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
 248 config 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
 256 config 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
 263 config 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
 270 config 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.
 277 endchoice
 278
 279 config 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
 287 config 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
 295 config PPC_EARLY_DEBUG_OPAL
 296         def_bool y
 297         depends on PPC_EARLY_DEBUG_OPAL_RAW || PPC_EARLY_DEBUG_OPAL_HVSI
 298
 299
 300 config 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
 308 config 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
 319 config 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
 327 config 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
 332 config PPC_EARLY_DEBUG_40x_PHYSADDR
 333         hex "Early debug UART physical address"
 334         depends on PPC_EARLY_DEBUG_40x
 335         default "0xef600300"
 336
 337 config 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
 349 config 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
 358 config 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
 369 config PPC_HTDUMP
 370         def_bool y
 371         depends on PPC_PTDUMP && PPC_BOOK3S
 372
 373 endmenu