linux/arch/blackfin/Kconfig.debug
Linus Torvalds b630a23a73 This is the bulk of pin control changes for the v4.15
kernel cycle:
 
 Core:
 
 - The pin control Kconfig entry PINCTRL is now turned into
   a menuconfig option. This obviously has the implication of
   making the subsystem menu visible in menuconfig. This is
   happening because of two things:
 
   - Intel have started to deploy and depend on pin controllers
     in a way that is affecting users directly. This happens
     on the highly integrated laptop chipsets named after
     geographical places: baytrail, broxton, cannonlake,
     cedarfork, cherryview, denverton, geminilake, lewisburg,
     merrifield, sunrisepoint... It started a while back and
     now it is ever more evident that this is crucial
     infrastructure for x86 laptops and not an embedded
     obscurity anymore. Users need to be aware.
 
   - Pin control expanders on I2C and SPI that are
     arch-agnostic. Currently Semtech SX150X and Microchip
     MCP28x08 but more are expected. Users will have to be
     able to configure these in directly for their set-up.
 
 - Just go and select GPIOLIB now that we made sure that
   GPIOLIB is a very vanilla subsystem. Do not depend on
   it, if we need it, select it.
 
 - Exposing the pin control subsystem in menuconfig uncovered
   a bunch of obscure bugs that are now hopefully fixed,
   all more or less pertaining to Blackfin.
 
 - Unified namespace for cross-calls between pin control and
   GPIO.
 
 - New support for clock skew/delay generic DT bindings
   and generic pin config options for this.
 
 - Minor documentation improvements.
 
 Various:
 
 - The Renesas SH-PFC pin controller has evolved a lot. It seems
   Renesas are churning out new SoCs by the minute.
 
 - A bunch of non-critical fixes for the Rockchip driver.
 
 - Improve the use of library functions instead of open coding.
 
 - Support the MCP28018 variant in the MCP28x08 driver.
 
 - Static constifying.
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Merge tag 'pinctrl-v4.15-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl

Pull pin control updates from Linus Walleij:
 "This is the bulk of pin control changes for the v4.15 kernel cycle:

  Core:

   - The pin control Kconfig entry PINCTRL is now turned into a
     menuconfig option. This obviously has the implication of making the
     subsystem menu visible in menuconfig. This is happening because of
     two things:

      (a) Intel have started to deploy and depend on pin controllers in
          a way that is affecting users directly. This happens on the
          highly integrated laptop chipsets named after geographical
          places: baytrail, broxton, cannonlake, cedarfork, cherryview,
          denverton, geminilake, lewisburg, merrifield, sunrisepoint...
          It started a while back and now it is ever more evident that
          this is crucial infrastructure for x86 laptops and not an
          embedded obscurity anymore. Users need to be aware.

      (b) Pin control expanders on I2C and SPI that are arch-agnostic.
          Currently Semtech SX150X and Microchip MCP28x08 but more are
          expected. Users will have to be able to configure these in
          directly for their set-up.

   - Just go and select GPIOLIB now that we made sure that GPIOLIB is a
     very vanilla subsystem. Do not depend on it, if we need it, select
     it.

   - Exposing the pin control subsystem in menuconfig uncovered a bunch
     of obscure bugs that are now hopefully fixed, all more or less
     pertaining to Blackfin.

   - Unified namespace for cross-calls between pin control and GPIO.

   - New support for clock skew/delay generic DT bindings and generic
     pin config options for this.

   - Minor documentation improvements.

  Various:

   - The Renesas SH-PFC pin controller has evolved a lot. It seems
     Renesas are churning out new SoCs by the minute.

   - A bunch of non-critical fixes for the Rockchip driver.

   - Improve the use of library functions instead of open coding.

   - Support the MCP28018 variant in the MCP28x08 driver.

   - Static constifying"

* tag 'pinctrl-v4.15-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl: (91 commits)
  pinctrl: gemini: Fix missing pad descriptions
  pinctrl: Add some depends on HAS_IOMEM
  pinctrl: samsung/s3c24xx: add CONFIG_OF dependency
  pinctrl: gemini: Fix GMAC groups
  pinctrl: qcom: spmi-gpio: Add pmi8994 gpio support
  pinctrl: ti-iodelay: remove redundant unused variable dev
  pinctrl: max77620: Use common error handling code in max77620_pinconf_set()
  pinctrl: gemini: Implement clock skew/delay config
  pinctrl: gemini: Use generic DT parser
  pinctrl: Add skew-delay pin config and bindings
  pinctrl: armada-37xx: Add edge both type gpio irq support
  pinctrl: uniphier: remove eMMC hardware reset pin-mux
  pinctrl: rockchip: Add iomux-route switching support for rk3288
  pinctrl: intel: Add Intel Cedar Fork PCH pin controller support
  pinctrl: intel: Make offset to interrupt status register configurable
  pinctrl: sunxi: Enforce the strict mode by default
  pinctrl: sunxi: Disable strict mode for old pinctrl drivers
  pinctrl: sunxi: Introduce the strict flag
  pinctrl: sh-pfc: Save/restore registers for PSCI system suspend
  pinctrl: sh-pfc: r8a7796: Use generic IOCTRL register description
  ...
2017-11-16 10:57:11 -08:00

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# SPDX-License-Identifier: GPL-2.0
menu "Kernel hacking"
source "lib/Kconfig.debug"
config DEBUG_VERBOSE
bool "Verbose fault messages"
default y
select PRINTK
help
When a program crashes due to an exception, or the kernel detects
an internal error, the kernel can print a not so brief message
explaining what the problem was. This debugging information is
useful to developers and kernel hackers when tracking down problems,
but mostly meaningless to other people. This is always helpful for
debugging but serves no purpose on a production system.
Most people should say N here.
config DEBUG_MMRS
tristate "Generate Blackfin MMR tree"
depends on !PINCTRL
select DEBUG_FS
help
Create a tree of Blackfin MMRs via the debugfs tree. If
you enable this, you will find all MMRs laid out in the
/sys/kernel/debug/blackfin/ directory where you can read/write
MMRs directly from userspace. This is obviously just a debug
feature.
config DEBUG_HWERR
bool "Hardware error interrupt debugging"
depends on DEBUG_KERNEL
help
When enabled, the hardware error interrupt is never disabled, and
will happen immediately when an error condition occurs. This comes
at a slight cost in code size, but is necessary if you are getting
hardware error interrupts and need to know where they are coming
from.
config EXACT_HWERR
bool "Try to make Hardware errors exact"
depends on DEBUG_HWERR
help
By default, the Blackfin hardware errors are not exact - the error
be reported multiple cycles after the error happens. This delay
can cause the wrong application, or even the kernel to receive a
signal to be killed. If you are getting HW errors in your system,
try turning this on to ensure they are at least coming from the
proper thread.
On production systems, it is safe (and a small optimization) to say N.
config DEBUG_DOUBLEFAULT
bool "Debug Double Faults"
default n
help
If an exception is caused while executing code within the exception
handler, the NMI handler, the reset vector, or in emulator mode,
a double fault occurs. On the Blackfin, this is a unrecoverable
event. You have two options:
- RESET exactly when double fault occurs. The excepting
instruction address is stored in RETX, where the next kernel
boot will print it out.
- Print debug message. This is much more error prone, although
easier to handle. It is error prone since:
- The excepting instruction is not committed.
- All writebacks from the instruction are prevented.
- The generated exception is not taken.
- The EXCAUSE field is updated with an unrecoverable event
The only way to check this is to see if EXCAUSE contains the
unrecoverable event value at every exception return. By selecting
this option, you are skipping over the faulting instruction, and
hoping things stay together enough to print out a debug message.
This does add a little kernel code, but is the only method to debug
double faults - if unsure say "Y"
choice
prompt "Double Fault Failure Method"
default DEBUG_DOUBLEFAULT_PRINT
depends on DEBUG_DOUBLEFAULT
config DEBUG_DOUBLEFAULT_PRINT
bool "Print"
config DEBUG_DOUBLEFAULT_RESET
bool "Reset"
endchoice
config DEBUG_HUNT_FOR_ZERO
bool "Catch NULL pointer reads/writes"
default y
help
Say Y here to catch reads/writes to anywhere in the memory range
from 0x0000 - 0x0FFF (the first 4k) of memory. This is useful in
catching common programming errors such as NULL pointer dereferences.
Misbehaving applications will be killed (generate a SEGV) while the
kernel will trigger a panic.
Enabling this option will take up an extra entry in CPLB table.
Otherwise, there is no extra overhead.
config DEBUG_BFIN_HWTRACE_ON
bool "Turn on Blackfin's Hardware Trace"
default y
help
All Blackfins include a Trace Unit which stores a history of the last
16 changes in program flow taken by the program sequencer. The history
allows the user to recreate the program sequencers recent path. This
can be handy when an application dies - we print out the execution
path of how it got to the offending instruction.
By turning this off, you may save a tiny amount of power.
choice
prompt "Omit loop Tracing"
default DEBUG_BFIN_HWTRACE_COMPRESSION_OFF
depends on DEBUG_BFIN_HWTRACE_ON
help
The trace buffer can be configured to omit recording of changes in
program flow that match either the last entry or one of the last
two entries. Omitting one of these entries from the record prevents
the trace buffer from overflowing because of any sort of loop (for, do
while, etc) in the program.
Because zero-overhead Hardware loops are not recorded in the trace buffer,
this feature can be used to prevent trace overflow from loops that
are nested four deep.
config DEBUG_BFIN_HWTRACE_COMPRESSION_OFF
bool "Trace all Loops"
help
The trace buffer records all changes of flow
config DEBUG_BFIN_HWTRACE_COMPRESSION_ONE
bool "Compress single-level loops"
help
The trace buffer does not record single loops - helpful if trace
is spinning on a while or do loop.
config DEBUG_BFIN_HWTRACE_COMPRESSION_TWO
bool "Compress two-level loops"
help
The trace buffer does not record loops two levels deep. Helpful if
the trace is spinning in a nested loop
endchoice
config DEBUG_BFIN_HWTRACE_COMPRESSION
int
depends on DEBUG_BFIN_HWTRACE_ON
default 0 if DEBUG_BFIN_HWTRACE_COMPRESSION_OFF
default 1 if DEBUG_BFIN_HWTRACE_COMPRESSION_ONE
default 2 if DEBUG_BFIN_HWTRACE_COMPRESSION_TWO
config DEBUG_BFIN_HWTRACE_EXPAND
bool "Expand Trace Buffer greater than 16 entries"
depends on DEBUG_BFIN_HWTRACE_ON
default n
help
By selecting this option, every time the 16 hardware entries in
the Blackfin's HW Trace buffer are full, the kernel will move them
into a software buffer, for dumping when there is an issue. This
has a great impact on performance, (an interrupt every 16 change of
flows) and should normally be turned off, except in those nasty
debugging sessions
config DEBUG_BFIN_HWTRACE_EXPAND_LEN
int "Size of Trace buffer (in power of 2k)"
range 0 4
depends on DEBUG_BFIN_HWTRACE_EXPAND
default 1
help
This sets the size of the software buffer that the trace information
is kept in.
0 for (2^0) 1k, or 256 entries,
1 for (2^1) 2k, or 512 entries,
2 for (2^2) 4k, or 1024 entries,
3 for (2^3) 8k, or 2048 entries,
4 for (2^4) 16k, or 4096 entries
config DEBUG_BFIN_NO_KERN_HWTRACE
bool "Turn off hwtrace in CPLB handlers"
depends on DEBUG_BFIN_HWTRACE_ON
default y
help
The CPLB error handler contains a lot of flow changes which can
quickly fill up the hardware trace buffer. When debugging crashes,
the hardware trace may indicate that the problem lies in kernel
space when in reality an application is buggy.
Say Y here to disable hardware tracing in some known "jumpy" pieces
of code so that the trace buffer will extend further back.
config EARLY_PRINTK
bool "Early printk"
default n
select SERIAL_CORE_CONSOLE
help
This option enables special console drivers which allow the kernel
to print messages very early in the bootup process.
This is useful for kernel debugging when your machine crashes very
early before the console code is initialized. After enabling this
feature, you must add "earlyprintk=serial,uart0,57600" to the
command line (bootargs). It is safe to say Y here in all cases, as
all of this lives in the init section and is thrown away after the
kernel boots completely.
config NMI_WATCHDOG
bool "Enable NMI watchdog to help debugging lockup on SMP"
default n
depends on SMP
help
If any CPU in the system does not execute the period local timer
interrupt for more than 5 seconds, then the NMI handler dumps debug
information. This information can be used to debug the lockup.
config CPLB_INFO
bool "Display the CPLB information"
help
Display the CPLB information via /proc/cplbinfo.
config ACCESS_CHECK
bool "Check the user pointer address"
default y
help
Usually the pointer transfer from user space is checked to see if its
address is in the kernel space.
Say N here to disable that check to improve the performance.
config BFIN_ISRAM_SELF_TEST
bool "isram boot self tests"
default n
help
Run some self tests of the isram driver code at boot.
config BFIN_PSEUDODBG_INSNS
bool "Support pseudo debug instructions"
default n
help
This option allows the kernel to emulate some pseudo instructions which
allow simulator test cases to be run under Linux with no changes.
Most people should say N here.
config BFIN_PM_WAKEUP_TIME_BENCH
bool "Display the total time for kernel to resume from power saving mode"
default n
help
Display the total time when kernel resumes normal from standby or
suspend to mem mode.
endmenu