Eric Lee / smarc-fsl-linux-kernel

01 Aug, 2008

1 commit

24 Jul, 2008

1 commit

05 May, 2008

1 commit

18 Apr, 2008

3 commits

  • 974460c5b   kgdb: allow static kgdbts boot configuration ... Browse Code »

    This patch adds in the ability to compile the kgdb internal test
    string into the kernel so as to run the tests at boot without changing
    the kernel boot arguments. This patch also changes all the error
    paths to invoke WARN_ON(1) which will emit the line number of the file
    and dump the kernel stack when an error occurs.

    You can disable the tests in a kernel that is built this way
    using "kgdbts="

    Signed-off-by: Jason Wessel
    Signed-off-by: Ingo Molnar

    Jason Wessel
     
  • e8d31c204   kgdb: add kgdb internal test suite ... Browse Code »

    This patch adds regression tests for testing the kgdb core and arch
    specific implementation.

    The kgdb test suite is designed to be built into the kernel and not as
    a module because it uses a number of low level kernel and kgdb
    primitives which should not be exported externally.

    The kgdb test suite is designed as a KGDB I/O module which
    simulates the communications that a debugger would have with kgdb.
    The tests are broken up in to a line by line and referenced here as
    a "get" which is kgdb requesting input and "put" which is kgdb
    sending a response.

    The kgdb suite can be invoked from the kernel command line
    arguments system or executed dynamically at run time. The test
    suite uses the variable "kgdbts" to obtain the information about
    which tests to run and to configure the verbosity level. The
    following are the various characters you can use with the kgdbts=
    line:

    When using the "kgdbts=" you only choose one of the following core
    test types:
    A = Run all the core tests silently
    V1 = Run all the core tests with minimal output
    V2 = Run all the core tests in debug mode

    You can also specify optional tests:
    N## = Go to sleep with interrupts of for ## seconds
    to test the HW NMI watchdog
    F## = Break at do_fork for ## iterations
    S## = Break at sys_open for ## iterations

    NOTE: that the do_fork and sys_open tests are mutually exclusive.

    To invoke the kgdb test suite from boot you use a kernel start
    argument as follows:
    kgdbts=V1 kgdbwait
    Or if you wanted to perform the NMI test for 6 seconds and do_fork
    test for 100 forks, you could use:
    kgdbts=V1N6F100 kgdbwait

    The test suite can also be invoked at run time with:
    echo kgdbts=V1N6F100 > /sys/module/kgdbts/parameters/kgdbts
    Or as another example:
    echo kgdbts=V2 > /sys/module/kgdbts/parameters/kgdbts

    When developing a new kgdb arch specific implementation or
    using these tests for the purpose of regression testing,
    several invocations are required.

    1) Boot with the test suite enabled by using the kernel arguments
    "kgdbts=V1F100 kgdbwait"
    ## If kgdb arch specific implementation has NMI use
    "kgdbts=V1N6F100

    2) After the system boot run the basic test.
    echo kgdbts=V1 > /sys/module/kgdbts/parameters/kgdbts

    3) Run the concurrency tests. It is best to use n+1
    while loops where n is the number of cpus you have
    in your system. The example below uses only two
    loops.

    ## This tests break points on sys_open
    while [ 1 ] ; do find / > /dev/null 2>&1 ; done &
    while [ 1 ] ; do find / > /dev/null 2>&1 ; done &
    echo kgdbts=V1S10000 > /sys/module/kgdbts/parameters/kgdbts
    fg # and hit control-c
    fg # and hit control-c
    ## This tests break points on do_fork
    while [ 1 ] ; do date > /dev/null ; done &
    while [ 1 ] ; do date > /dev/null ; done &
    echo kgdbts=V1F1000 > /sys/module/kgdbts/parameters/kgdbts
    fg # and hit control-c

    Signed-off-by: Jason Wessel
    Signed-off-by: Ingo Molnar

    Jason Wessel
     
  • dc7d55270   kgdb: core ... Browse Code »

    kgdb core code. Handles the protocol and the arch details.

    [ mingo@elte.hu: heavily modified, simplified and cleaned up. ]
    [ xemul@openvz.org: use find_task_by_pid_ns ]

    Signed-off-by: Jason Wessel
    Signed-off-by: Ingo Molnar
    Signed-off-by: Jan Kiszka
    Reviewed-by: Thomas Gleixner

    Jason Wessel