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linux/arch/s390/kernel
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Peter Oberparleiter 70aa5d3982 s390/sclp: add tracing of SCLP interactions 
Add tracing of interactions between the SCLP base driver, firmware and
other drivers to support problem determination in case of SCLP-related
issues.

For that purpose this patch introduces two new s390dbf debug areas:

  - sclp: An abbreviated log of all common interactions
  - sclp_err: A full log of failed or abnormal interactions

Tracing of full SCCB contents can be enabled for the sclp area by
setting its debug level to maximum (6).

Overview of added trace events:

  * Firmware interaction:
    - SRV1: Service call about to be issued
    - SRV2: Service call was issued
    - INT:  Interrupt received

  * Driver interaction:
    - RQAD: Request was added
    - RQOK: Request success
    - RQAB: Request aborted
    - RQTM: Request timed out
    - REG:  Event listener registered
    - UREG: Event listener unregistered
    - EVNT: Event callback
    - STCG: State-change callback

  * Abnormal events:
    - TMO:  A timeout occurred
    - UNEX: Unexpected SCCB completion

  * Other (not traced at default level):
    - SYN1: Synchronous wait start
    - SYN2: Synchronous wait end

Since the SCLP interface is used by console drivers this patch also
moves s390dbf printks outside the critical section protected by debug
area locks to prevent a potential deadlock that would otherwise be
introduced between console_owner --> sclp_lock --> sclp_debug.lock.

Signed-off-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-08-25 11:03:35 +02:00
..
syscalls quota: Wire up quotactl_fd syscall 2021-06-07 12:11:24 +02:00
vdso32 s390: enable KCSAN 2021-07-30 17:09:23 +02:00
vdso64 s390: enable KCSAN 2021-07-30 17:09:23 +02:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
alternative.c s390/facilities: move stfl information from lowcore to global data 2021-06-07 17:06:58 +02:00
asm-offsets.c s390/setup: generate asm offsets from struct parmarea 2021-07-27 09:39:16 +02:00
audit.c
audit.h
base.S s390: remove unused s390_base_ext_handler 2020-11-09 11:20:58 +01:00
cache.c
compat_audit.c
compat_linux.c
compat_linux.h
compat_ptrace.h
compat_signal.c s390/signal: switch to using vdso for sigreturn and syscall restart 2021-07-08 22:09:47 +02:00
cpcmd.c s390/cpcmd: use register pair instead of register asm 2021-06-18 16:41:22 +02:00
crash_dump.c s390/dump: introduce boot data 'oldmem_data' 2021-07-27 09:39:16 +02:00
debug.c s390/sclp: add tracing of SCLP interactions 2021-08-25 11:03:35 +02:00
diag.c s390: rename dma section to amode31 2021-08-05 14:10:53 +02:00
dis.c s390/disassembler: add instructions 2021-07-27 09:39:19 +02:00
dumpstack.c s390/unwind: add machine check handler stack 2021-04-05 11:30:07 +02:00
early_printk.c s390/sclp: remove unused sclp_early_printk_forced 2020-09-21 08:08:44 +02:00
early.c s390: make PCI mio support a machine flag 2021-07-27 09:39:19 +02:00
ebcdic.c
entry.h s390: remove do_signal() prototype and do_notify_resume() function 2021-08-25 11:03:34 +02:00
entry.S s390/mcck: move register validation to C code 2021-07-05 12:44:23 +02:00
fpu.c s390: convert to generic entry 2021-01-19 12:29:26 +01:00
ftrace.c s390/ftrace: implement hotpatching 2021-08-03 14:31:40 +02:00
ftrace.h s390/ftrace: implement hotpatching 2021-08-03 14:31:40 +02:00
guarded_storage.c
head64.S s390/boot: move dma sections from decompressor to decompressed kernel 2021-07-27 09:39:17 +02:00
idle.c s390/time,idle: get rid of unsigned long long 2021-03-08 10:46:27 +01:00
ima_arch.c
ipl_vmparm.c s390/cio: remove unused include linux/spinlock.h from cio.h 2021-07-27 09:39:13 +02:00
ipl.c s390: rename dma section to amode31 2021-08-05 14:10:53 +02:00
irq.c s390: replace deprecated CPU-hotplug functions 2021-08-05 14:10:53 +02:00
jump_label.c s390/jump_label: print real address in a case of a jump label bug 2021-07-27 09:39:13 +02:00
kdebugfs.c
kexec_elf.c kexec: Fix file verification on S390 2019-09-10 13:27:51 +01:00
kexec_image.c kexec_file: split KEXEC_VERIFY_SIG into KEXEC_SIG and KEXEC_SIG_FORCE 2019-08-19 21:54:15 -07:00
kprobes_insn_page.S s390/kprobes: move insn_page to text segment 2020-10-09 23:45:30 +02:00
kprobes.c s390/kprobes: use is_kernel() helper 2021-07-05 12:44:23 +02:00
lgr.c s390: convert to msecs_to_jiffies() 2020-06-29 16:31:46 +02:00
machine_kexec_file.c s390/kexec_file: fix initrd location for kdump kernel 2020-05-14 23:21:37 +02:00
machine_kexec_reloc.c s390/kaslr: add support for R_390_JMP_SLOT relocation type 2020-05-20 10:13:27 +02:00
machine_kexec.c s390: rename dma section to amode31 2021-08-05 14:10:53 +02:00
Makefile s390: rename dma section to amode31 2021-08-05 14:10:53 +02:00
mcount.S s390/ftrace: fix ftrace_update_ftrace_func implementation 2021-07-15 12:54:58 +02:00
module.c s390/ftrace: implement hotpatching 2021-08-03 14:31:40 +02:00
nmi.c s390/mcck: move register validation to C code 2021-07-05 12:44:23 +02:00
nospec-branch.c s390/speculation: Use statically initialized const for instructions 2021-06-28 11:18:28 +02:00
nospec-sysfs.c s390/facilities: move stfl information from lowcore to global data 2021-06-07 17:06:58 +02:00
numa.c s390/numa: move code to arch/s390/kernel 2020-08-11 18:16:55 +02:00
os_info.c s390/dump: introduce boot data 'oldmem_data' 2021-07-27 09:39:16 +02:00
perf_cpum_cf_common.c s390/cpumf: Allow concurrent access for CPU Measurement Counter Facility 2021-07-05 12:44:23 +02:00
perf_cpum_cf_events.c s390/cpum_cf,perf: change DFLT_CCERROR counter name 2020-07-21 13:53:56 +02:00
perf_cpum_cf.c s390: replace deprecated CPU-hotplug functions 2021-08-05 14:10:53 +02:00
perf_cpum_sf.c s390/time: convert tod_clock_base to union 2021-02-13 17:17:54 +01:00
perf_event.c s390: Get rid of oprofile leftovers 2021-04-22 13:32:39 +01:00
perf_regs.c perf/arch: Remove perf_sample_data::regs_user_copy 2020-11-09 18:12:34 +01:00
process.c s390/signal: switch to using vdso for sigreturn and syscall restart 2021-07-08 22:09:47 +02:00
processor.c s390: replace deprecated CPU-hotplug functions 2021-08-05 14:10:53 +02:00
ptrace.c s390/traps: add struct to access transactional diagnostic block 2021-06-07 17:06:58 +02:00
reipl.S
relocate_kernel.S
runtime_instr.c s390/runtime_instrumentation: fix storage key handling 2020-08-17 13:17:10 +02:00
setup.c s390/sclp: reserve memory occupied by sclp early buffer 2021-08-18 10:01:29 +02:00
signal.c s390: remove do_signal() prototype and do_notify_resume() function 2021-08-25 11:03:34 +02:00
smp.c s390: rename dma section to amode31 2021-08-05 14:10:53 +02:00
stacktrace.c stacktrace: Move documentation for arch_stack_walk_reliable() to header 2021-03-10 15:52:31 +01:00
sthyi.c s390/sthyi: use register pair instead of register asm 2021-06-18 16:41:22 +02:00
syscall.c s390: rename PIF_SYSCALL_RESTART to PIF_EXECVE_PGSTE_RESTART 2021-07-08 22:12:17 +02:00
sysinfo.c s390/sysinfo: get rid of register asm 2021-06-18 16:41:23 +02:00
text_amode31.S s390/diag: make restart_part2 a local label 2021-08-25 11:03:34 +02:00
time.c s390/vdso: fix initializing and updating of vdso_data 2021-03-25 21:57:26 +01:00
topology.c s390: replace deprecated CPU-hotplug functions 2021-08-05 14:10:53 +02:00
trace.c s390/ftrace: fix potential crashes when switching tracers 2020-04-22 16:20:55 +02:00
traps.c s390: rename dma section to amode31 2021-08-05 14:10:53 +02:00
unwind_bc.c s390/unwind: stop gracefully at user mode pt_regs in irq stack 2019-12-18 23:29:26 +01:00
uprobes.c s390: Fix fall-through warnings for Clang 2021-07-13 14:43:09 -05:00
uv.c s390/uv: de-duplicate checks for Protected Host Virtualization 2021-07-27 09:39:14 +02:00
vdso.c s390/vdso: add minimal compat vdso 2021-07-08 15:37:28 +02:00
vmlinux.lds.S s390: fix typo in linker script 2021-08-25 11:03:34 +02:00
vtime.c s390/vtime: fix increased steal time accounting 2021-03-15 19:09:25 +01:00