linux/arch/powerpc/Kconfig.debug
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   1# SPDX-License-Identifier: GPL-2.0
   2
   3config PPC_DISABLE_WERROR
   4        bool "Don't build arch/powerpc code with -Werror"
   5        help
   6          This option tells the compiler NOT to build the code under
   7          arch/powerpc with the -Werror flag (which means warnings
   8          are treated as errors).
   9
  10          Only enable this if you are hitting a build failure in the
  11          arch/powerpc code caused by a warning, and you don't feel
  12          inclined to fix it.
  13
  14config PPC_WERROR
  15        bool
  16        depends on !PPC_DISABLE_WERROR
  17        default y
  18
  19config PRINT_STACK_DEPTH
  20        int "Stack depth to print" if DEBUG_KERNEL
  21        default 64
  22        help
  23          This option allows you to set the stack depth that the kernel
  24          prints in stack traces. This can be useful if your display is
  25          too small and stack traces cause important information to
  26          scroll off the screen.
  27
  28config HCALL_STATS
  29        bool "Hypervisor call instrumentation"
  30        depends on PPC_PSERIES && DEBUG_FS && TRACEPOINTS
  31        help
  32          Adds code to keep track of the number of hypervisor calls made and
  33          the amount of time spent in hypervisor calls.  Wall time spent in
  34          each call is always calculated, and if available CPU cycles spent
  35          are also calculated.  A directory named hcall_inst is added at the
  36          root of the debugfs filesystem.  Within the hcall_inst directory
  37          are files that contain CPU specific call statistics.
  38
  39          This option will add a small amount of overhead to all hypervisor
  40          calls.
  41
  42config PPC_EMULATED_STATS
  43        bool "Emulated instructions tracking"
  44        depends on DEBUG_FS
  45        help
  46          Adds code to keep track of the number of instructions that are
  47          emulated by the in-kernel emulator. Counters for the various classes
  48          of emulated instructions are available under
  49          powerpc/emulated_instructions/ in the root of the debugfs file
  50          system. Optionally (controlled by
  51          powerpc/emulated_instructions/do_warn in debugfs), rate-limited
  52          warnings can be printed to the console when instructions are
  53          emulated.
  54
  55config CODE_PATCHING_SELFTEST
  56        bool "Run self-tests of the code-patching code"
  57        depends on DEBUG_KERNEL
  58
  59config JUMP_LABEL_FEATURE_CHECKS
  60        bool "Enable use of jump label for cpu/mmu_has_feature()"
  61        depends on JUMP_LABEL
  62        default y
  63        help
  64          Selecting this options enables use of jump labels for some internal
  65          feature checks. This should generate more optimal code for those
  66          checks.
  67
  68config JUMP_LABEL_FEATURE_CHECK_DEBUG
  69        bool "Do extra check on feature fixup calls"
  70        depends on DEBUG_KERNEL && JUMP_LABEL_FEATURE_CHECKS
  71        help
  72          This tries to catch incorrect usage of cpu_has_feature() and
  73          mmu_has_feature() in the code.
  74
  75          If you don't know what this means, say N.
  76
  77config FTR_FIXUP_SELFTEST
  78        bool "Run self-tests of the feature-fixup code"
  79        depends on DEBUG_KERNEL
  80
  81config MSI_BITMAP_SELFTEST
  82        bool "Run self-tests of the MSI bitmap code"
  83        depends on DEBUG_KERNEL
  84
  85config PPC_IRQ_SOFT_MASK_DEBUG
  86        bool "Include extra checks for powerpc irq soft masking"
  87        depends on PPC64
  88
  89config PPC_RFI_SRR_DEBUG
  90        bool "Include extra checks for RFI SRR register validity"
  91        depends on PPC_BOOK3S_64
  92
  93config XMON
  94        bool "Include xmon kernel debugger"
  95        depends on DEBUG_KERNEL
  96        select CONSOLE_POLL if SERIAL_CPM_CONSOLE
  97        help
  98          Include in-kernel hooks for the xmon kernel monitor/debugger.
  99          Unless you are intending to debug the kernel, say N here.
 100          Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
 101          nothing will appear on the screen (xmon writes directly to the
 102          framebuffer memory).
 103          The cmdline option 'xmon' or 'xmon=early' will drop into xmon
 104          very early during boot. 'xmon=on' will just enable the xmon
 105          debugger hooks.  'xmon=off' will disable the debugger hooks
 106          if CONFIG_XMON_DEFAULT is set.
 107          xmon will print a backtrace on the very first invocation.
 108          'xmon=nobt' will disable this autobacktrace.
 109
 110config XMON_DEFAULT
 111        bool "Enable xmon by default"
 112        depends on XMON
 113        help
 114          xmon is normally disabled unless booted with 'xmon=on'.
 115          Use 'xmon=off' to disable xmon init during runtime.
 116
 117config XMON_DISASSEMBLY
 118        bool "Include disassembly support in xmon"
 119        depends on XMON
 120        default y
 121        help
 122          Include support for disassembling in xmon. You probably want
 123          to say Y here, unless you're building for a memory-constrained
 124          system.
 125
 126config XMON_DEFAULT_RO_MODE
 127        bool "Restrict xmon to read-only operations by default"
 128        depends on XMON
 129        default y
 130        help
 131          Operate xmon in read-only mode. The cmdline options 'xmon=rw' and
 132          'xmon=ro' override this default.
 133
 134config DEBUGGER
 135        bool
 136        depends on KGDB || XMON
 137        default y
 138
 139config BDI_SWITCH
 140        bool "Include BDI-2000 user context switcher"
 141        depends on DEBUG_KERNEL && PPC32
 142        help
 143          Include in-kernel support for the Abatron BDI2000 debugger.
 144          Unless you are intending to debug the kernel with one of these
 145          machines, say N here.
 146
 147config BOOTX_TEXT
 148        bool "Support for early boot text console (BootX or OpenFirmware only)"
 149        depends on PPC_BOOK3S
 150        help
 151          Say Y here to see progress messages from the boot firmware in text
 152          mode. Requires either BootX or Open Firmware.
 153
 154config PPC_EARLY_DEBUG
 155        bool "Early debugging (dangerous)"
 156        help
 157          Say Y to enable some early debugging facilities that may be available
 158          for your processor/board combination. Those facilities are hacks
 159          intended to debug problems early during boot, this should not be
 160          enabled in a production kernel.
 161          Note that enabling this will also cause the kernel default log level
 162          to be pushed to max automatically very early during boot
 163
 164choice
 165        prompt "Early debugging console"
 166        depends on PPC_EARLY_DEBUG
 167        help
 168          Use the selected console for early debugging. Careful, if you
 169          enable debugging for the wrong type of machine your kernel
 170          _will not boot_.
 171
 172config PPC_EARLY_DEBUG_BOOTX
 173        bool "BootX or OpenFirmware"
 174        depends on BOOTX_TEXT
 175        help
 176          Select this to enable early debugging for a machine using BootX
 177          or OpenFirmware.
 178
 179config PPC_EARLY_DEBUG_LPAR
 180        bool "LPAR HV Console"
 181        depends on PPC_PSERIES && HVC_CONSOLE
 182        help
 183          Select this to enable early debugging for a machine with a HVC
 184          console on vterm 0.
 185
 186config PPC_EARLY_DEBUG_LPAR_HVSI
 187        bool "LPAR HVSI Console"
 188        depends on PPC_PSERIES && HVC_CONSOLE
 189        help
 190          Select this to enable early debugging for a machine with a HVSI
 191          console on a specified vterm.
 192
 193config PPC_EARLY_DEBUG_G5
 194        bool "Apple G5"
 195        depends on PPC_PMAC64
 196        help
 197          Select this to enable early debugging for Apple G5 machines.
 198
 199config PPC_EARLY_DEBUG_RTAS_PANEL
 200        bool "RTAS Panel"
 201        depends on PPC_RTAS
 202        help
 203          Select this to enable early debugging via the RTAS panel.
 204
 205config PPC_EARLY_DEBUG_RTAS_CONSOLE
 206        bool "RTAS Console"
 207        depends on PPC_RTAS
 208        select UDBG_RTAS_CONSOLE
 209        help
 210          Select this to enable early debugging via the RTAS console.
 211
 212config PPC_EARLY_DEBUG_MAPLE
 213        bool "Maple real mode"
 214        depends on PPC_MAPLE
 215        help
 216          Select this to enable early debugging for Maple.
 217
 218config PPC_EARLY_DEBUG_PAS_REALMODE
 219        bool "PA Semi real mode"
 220        depends on PPC_PASEMI
 221        help
 222          Select this to enable early debugging for PA Semi.
 223          Output will be on UART0.
 224
 225config PPC_EARLY_DEBUG_44x
 226        bool "Early serial debugging for IBM/AMCC 44x CPUs"
 227        depends on 44x
 228        help
 229          Select this to enable early debugging for IBM 44x chips via the
 230          inbuilt serial port.  If you enable this, ensure you set
 231          PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.
 232
 233config PPC_EARLY_DEBUG_40x
 234        bool "Early serial debugging for IBM/AMCC 40x CPUs"
 235        depends on 40x
 236        help
 237          Select this to enable early debugging for IBM 40x chips via the
 238          inbuilt serial port. This works on chips with a 16550 compatible
 239          UART.
 240
 241config PPC_EARLY_DEBUG_CPM
 242        bool "Early serial debugging for Freescale CPM-based serial ports"
 243        depends on SERIAL_CPM
 244        help
 245          Select this to enable early debugging for Freescale chips
 246          using a CPM-based serial port.  This assumes that the bootwrapper
 247          has run, and set up the CPM in a particular way.
 248
 249config PPC_EARLY_DEBUG_USBGECKO
 250        bool "Early debugging through the USB Gecko adapter"
 251        depends on GAMECUBE_COMMON
 252        select USBGECKO_UDBG
 253        help
 254          Select this to enable early debugging for Nintendo GameCube/Wii
 255          consoles via an external USB Gecko adapter.
 256
 257config PPC_EARLY_DEBUG_PS3GELIC
 258        bool "Early debugging through the PS3 Ethernet port"
 259        depends on PPC_PS3
 260        select PS3GELIC_UDBG
 261        help
 262          Select this to enable early debugging for the PlayStation3 via
 263          UDP broadcasts sent out through the Ethernet port.
 264
 265config PPC_EARLY_DEBUG_OPAL_RAW
 266        bool "OPAL raw console"
 267        depends on HVC_OPAL
 268        help
 269          Select this to enable early debugging for the PowerNV platform
 270          using a "raw" console
 271
 272config PPC_EARLY_DEBUG_OPAL_HVSI
 273        bool "OPAL hvsi console"
 274        depends on HVC_OPAL
 275        help
 276          Select this to enable early debugging for the PowerNV platform
 277          using an "hvsi" console
 278
 279config PPC_EARLY_DEBUG_MEMCONS
 280        bool "In memory console"
 281        help
 282          Select this to enable early debugging using an in memory console.
 283          This console provides input and output buffers stored within the
 284          kernel BSS and should be safe to select on any system. A debugger
 285          can then be used to read kernel output or send input to the console.
 286endchoice
 287
 288config PPC_MEMCONS_OUTPUT_SIZE
 289        int "In memory console output buffer size"
 290        depends on PPC_EARLY_DEBUG_MEMCONS
 291        default 4096
 292        help
 293          Selects the size of the output buffer (in bytes) of the in memory
 294          console.
 295
 296config PPC_MEMCONS_INPUT_SIZE
 297        int "In memory console input buffer size"
 298        depends on PPC_EARLY_DEBUG_MEMCONS
 299        default 128
 300        help
 301          Selects the size of the input buffer (in bytes) of the in memory
 302          console.
 303
 304config PPC_EARLY_DEBUG_OPAL
 305        def_bool y
 306        depends on PPC_EARLY_DEBUG_OPAL_RAW || PPC_EARLY_DEBUG_OPAL_HVSI
 307
 308
 309config PPC_EARLY_DEBUG_HVSI_VTERMNO
 310        hex "vterm number to use with early debug HVSI"
 311        depends on PPC_EARLY_DEBUG_LPAR_HVSI
 312        default "0x30000000"
 313        help
 314          You probably want 0x30000000 for your first serial port and
 315          0x30000001 for your second one
 316
 317config PPC_EARLY_DEBUG_OPAL_VTERMNO
 318        hex "vterm number to use with OPAL early debug"
 319        depends on PPC_EARLY_DEBUG_OPAL
 320        default "0"
 321        help
 322          This correspond to which /dev/hvcN you want to use for early
 323          debug.
 324
 325          On OPAL v2, this will be 0 for network console and 1 or 2 for
 326          the machine built-in serial ports.
 327
 328config PPC_EARLY_DEBUG_44x_PHYSLOW
 329        hex "Low 32 bits of early debug UART physical address"
 330        depends on PPC_EARLY_DEBUG_44x
 331        default "0x40000200"
 332        help
 333          You probably want 0x40000200 for ebony boards and
 334          0x40000300 for taishan
 335
 336config PPC_EARLY_DEBUG_44x_PHYSHIGH
 337        hex "EPRN of early debug UART physical address"
 338        depends on PPC_EARLY_DEBUG_44x
 339        default "0x1"
 340
 341config PPC_EARLY_DEBUG_40x_PHYSADDR
 342        hex "Early debug UART physical address"
 343        depends on PPC_EARLY_DEBUG_40x
 344        default "0xef600300"
 345
 346config PPC_EARLY_DEBUG_CPM_ADDR
 347        hex "CPM UART early debug transmit descriptor address"
 348        depends on PPC_EARLY_DEBUG_CPM
 349        default "0xfa202008" if PPC_EP88XC
 350        default "0xf0001ff8" if CPM2
 351        default "0xff002008" if CPM1
 352        help
 353          This specifies the address of the transmit descriptor
 354          used for early debug output.  Because it is needed before
 355          platform probing is done, all platforms selected must
 356          share the same address.
 357
 358config FAIL_IOMMU
 359        bool "Fault-injection capability for IOMMU"
 360        depends on FAULT_INJECTION
 361        depends on PCI || IBMVIO
 362        help
 363          Provide fault-injection capability for IOMMU. Each device can
 364          be selectively enabled via the fail_iommu property.
 365
 366          If you are unsure, say N.
 367
 368config PPC_PTDUMP
 369        bool "Export kernel pagetable layout to userspace via debugfs"
 370        depends on DEBUG_KERNEL && DEBUG_FS
 371        help
 372          This option exports the state of the kernel pagetables to a
 373          debugfs file. This is only useful for kernel developers who are
 374          working in architecture specific areas of the kernel - probably
 375          not a good idea to enable this feature in a production kernel.
 376
 377          If you are unsure, say N.
 378
 379config PPC_DEBUG_WX
 380        bool "Warn on W+X mappings at boot"
 381        depends on PPC_PTDUMP && STRICT_KERNEL_RWX
 382        help
 383          Generate a warning if any W+X mappings are found at boot.
 384
 385          This is useful for discovering cases where the kernel is leaving
 386          W+X mappings after applying NX, as such mappings are a security risk.
 387
 388          Note that even if the check fails, your kernel is possibly
 389          still fine, as W+X mappings are not a security hole in
 390          themselves, what they do is that they make the exploitation
 391          of other unfixed kernel bugs easier.
 392
 393          There is no runtime or memory usage effect of this option
 394          once the kernel has booted up - it's a one time check.
 395
 396          If in doubt, say "Y".
 397
 398config PPC_FAST_ENDIAN_SWITCH
 399        bool "Deprecated fast endian-switch syscall"
 400        depends on DEBUG_KERNEL && PPC_BOOK3S_64
 401        help
 402          If you're unsure what this is, say N.
 403
 404config KASAN_SHADOW_OFFSET
 405        hex
 406        depends on KASAN
 407        default 0xe0000000
 408