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| author |   Christian Borntraeger <borntraeger@de.ibm.com> | 2015-10-06 18:06:15 +0200 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-10-14 14:32:12 +0200 |
| commit | e22cf8ca6f75a6c4fccf2d6ee818bdb1205f32e6 (patch) | |
| tree | 12ed8edf751776df56b758ba1347b991dbe2afb7 /arch/s390/kernel/head64.S | |
| parent | s390/asm: make use of the OFFSET macro to define assember constants (diff) | |
| download | linux-dev-e22cf8ca6f75a6c4fccf2d6ee818bdb1205f32e6.tar.xz linux-dev-e22cf8ca6f75a6c4fccf2d6ee818bdb1205f32e6.zip | |
s390/cpumf: rework program parameter setting to detect guest samples
The program parameter can be used to mark hardware samples with
some token. Previously, it was used to mark guest samples only.
Improve the program parameter doubleword by combining two parts,
the leftmost LPP part and the rightmost PID part. Set the PID
part for processes by using the task PID.
To distinguish host and guest samples for the kernel (PID part
is zero), the guest must always set the program paramater to a
non-zero value. Use the leftmost bit in the LPP part of the
program parameter to be able to detect guest kernel samples.
[brueckner@linux.vnet.ibm.com]: Split __LC_CURRENT and introduced
__LC_LPP. Corrected __LC_CURRENT users and adjusted assembler parts.
And updated the commit message accordingly.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/head64.S')
| -rw-r--r-- | arch/s390/kernel/head64.S | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S index d7c00507568a..58b719fa8067 100644 --- a/arch/s390/kernel/head64.S +++ b/arch/s390/kernel/head64.S @@ -16,7 +16,12 @@ __HEAD ENTRY(startup_continue) - larl %r1,sched_clock_base_cc + tm __LC_STFL_FAC_LIST+6,0x80 # LPP available ? + jz 0f + xc __LC_LPP+1(7,0),__LC_LPP+1 # clear lpp and current_pid + mvi __LC_LPP,0x80 # and set LPP_MAGIC + .insn s,0xb2800000,__LC_LPP # load program parameter +0: larl %r1,sched_clock_base_cc mvc 0(8,%r1),__LC_LAST_UPDATE_CLOCK larl %r13,.LPG1 # get base lctlg %c0,%c15,.Lctl-.LPG1(%r13) # load control registers |