arch/powerpc/Kconfig.debug

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