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[PATCH 0/1] perf cs-etm: Output 0 instead of 0xdeadbeef when exception packets are flushed

by James Clark

I noticed this when looking into Ganapat's fix to arm-cs-trace-disasm.py. I assumed that seeing this in the output was a bug and went to investigate why it happened in some cases and not others. It turned out to not actually be a bug, but I think it doesn't look right. In the end this change doesn't really accomplish anything and I'm not sure if it's worth putting it in or not? Maybe it will save someone doing the same thing as me, or maybe it will actually break something if someones script is looking for 0xdeadbeef? James Clark (1): perf cs-etm: Output 0 instead of 0xdeadbeef when exception packets are flushed tools/perf/util/cs-etm.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) -- 2.34.1

11 months

Re: [PATCH] perf scripts python: cs-etm: Update example to provide vmlinux path to Perf

by James Clark

On 24/07/2024 4:00 pm, Leo Yan wrote: > On 7/24/2024 3:33 PM, James Clark wrote: >> >> The example shows the vmlinux path being given to the script, but this >> only works when running on the target. If the script is run off the >> target, then confusingly the vmlinux argument also needs to be given to >> Perf as well. >> >> Without going into too much detail in the example about when it is or >> isn't required, just include it. It doesn't do any harm even when >> running on the target. Now the example command works in both places. >> >> Signed-off-by: James Clark <james.clark(a)linaro.org> > > The change makes senses to me. Just check a bit, does it need to add the same > option for the command "only source line and symbols"? > > Thanks, > Leo > I assumed that because that one didn't have vmlinux at all then it's just for userspace tracing. I think it's good to have an example without vmlinux to show that it's not a strict requirement. >> --- >> tools/perf/scripts/python/arm-cs-trace-disasm.py | 4 ++-- >> 1 file changed, 2 insertions(+), 2 deletions(-) >> >> diff --git a/tools/perf/scripts/python/arm-cs-trace-disasm.py b/tools/perf/scripts/python/arm-cs-trace-disasm.py >> index 7aff02d84ffb..4aeb9b497f7a 100755 >> --- a/tools/perf/scripts/python/arm-cs-trace-disasm.py >> +++ b/tools/perf/scripts/python/arm-cs-trace-disasm.py >> @@ -19,10 +19,10 @@ from perf_trace_context import perf_set_itrace_options, \ >> # Below are some example commands for using this script. >> # >> # Output disassembly with objdump: >> -# perf script -s scripts/python/arm-cs-trace-disasm.py \ >> +# perf script -k path/to/vmlinux -s scripts/python/arm-cs-trace-disasm.py \ >> # -- -d objdump -k path/to/vmlinux >> # Output disassembly with llvm-objdump: >> -# perf script -s scripts/python/arm-cs-trace-disasm.py \ >> +# perf script -k path/to/vmlinux -s scripts/python/arm-cs-trace-disasm.py \ >> # -- -d llvm-objdump-11 -k path/to/vmlinux >> # Output only source line and symbols: >> # perf script -s scripts/python/arm-cs-trace-disasm.py >> -- >> 2.34.1 >>

11 months

[PATCH] perf scripts python: cs-etm: Update example to provide vmlinux path to Perf

by James Clark

The example shows the vmlinux path being given to the script, but this only works when running on the target. If the script is run off the target, then confusingly the vmlinux argument also needs to be given to Perf as well. Without going into too much detail in the example about when it is or isn't required, just include it. It doesn't do any harm even when running on the target. Now the example command works in both places. Signed-off-by: James Clark <james.clark(a)linaro.org> --- tools/perf/scripts/python/arm-cs-trace-disasm.py | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/perf/scripts/python/arm-cs-trace-disasm.py b/tools/perf/scripts/python/arm-cs-trace-disasm.py index 7aff02d84ffb..4aeb9b497f7a 100755 --- a/tools/perf/scripts/python/arm-cs-trace-disasm.py +++ b/tools/perf/scripts/python/arm-cs-trace-disasm.py @@ -19,10 +19,10 @@ from perf_trace_context import perf_set_itrace_options, \ # Below are some example commands for using this script. # # Output disassembly with objdump: -# perf script -s scripts/python/arm-cs-trace-disasm.py \ +# perf script -k path/to/vmlinux -s scripts/python/arm-cs-trace-disasm.py \ # -- -d objdump -k path/to/vmlinux # Output disassembly with llvm-objdump: -# perf script -s scripts/python/arm-cs-trace-disasm.py \ +# perf script -k path/to/vmlinux -s scripts/python/arm-cs-trace-disasm.py \ # -- -d llvm-objdump-11 -k path/to/vmlinux # Output only source line and symbols: # perf script -s scripts/python/arm-cs-trace-disasm.py -- 2.34.1

11 months

Re: [PATCH] perf scripts python arm-cs-trace-disasm.py: Skip disasm if address continuity is broken

by James Clark

On 23/07/2024 4:26 pm, Ganapatrao Kulkarni wrote: > > > On 23-07-2024 06:40 pm, James Clark wrote: >> >> >> On 22/07/2024 11:02 am, Ganapatrao Kulkarni wrote: >>> >>> Hi James, >>> >>> On 19-07-2024 08:09 pm, James Clark wrote: >>>> >>>> >>>> On 19/07/2024 10:26 am, Ganapatrao Kulkarni wrote: >>>>> To generate the instruction tracing, script uses 2 contiguous packets >>>>> address range. If there a continuity brake due to discontiguous branch >>>>> address, it is required to reset the tracing and start tracing with >>>>> the >>>>> new set of contiguous packets. >>>>> >>>>> Adding change to identify the break and complete the remaining tracing >>>>> of current packets and restart tracing from new set of packets, if >>>>> continuity is established. >>>>> >>>> >>>> Hi Ganapatrao, >>>> >>>> Can you add a before and after example of what's changed to the >>>> commit message? It wasn't immediately obvious to me if this is >>>> adding missing output, or it was correcting the tail end of the >>>> output that was previously wrong. >>> >>> It is adding tail end of the trace as well avoiding the segfault of >>> the perf application. With out this change the perf segfaults with as >>> below log >>> >>> >>> ./perf script --script=python:./scripts/python/arm-cs-trace-disasm.py >>> -- -d objdump -k ../../vmlinux -v $* > dump >>> objdump: error: the stop address should be after the start address >>> Traceback (most recent call last): >>> File "./scripts/python/arm-cs-trace-disasm.py", line 271, in >>> process_event >>> print_disam(dso_fname, dso_vm_start, start_addr, stop_addr) >>> File "./scripts/python/arm-cs-trace-disasm.py", line 105, in >>> print_disam >>> for line in read_disam(dso_fname, dso_start, start_addr, >>> stop_addr): >>> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ >>> File "./scripts/python/arm-cs-trace-disasm.py", line 99, in >>> read_disam >>> disasm_output = check_output(disasm).decode('utf-8').split('\n') >>> ^^^^^^^^^^^^^^^^^^^^ >>> File "/usr/lib64/python3.12/subprocess.py", line 466, in check_output >>> return run(*popenargs, stdout=PIPE, timeout=timeout, check=True, >>> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ >>> File "/usr/lib64/python3.12/subprocess.py", line 571, in run >>> raise CalledProcessError(retcode, process.args, >>> subprocess.CalledProcessError: Command '['objdump', '-d', '-z', >>> '--start-address=0xffff80008125b758', >>> '--stop-address=0xffff80008125a934', '../../vmlinux']' returned >>> non-zero exit status 1. >>> Fatal Python error: handler_call_die: problem in Python trace event >>> handler >>> Python runtime state: initialized >>> >>> Current thread 0x0000ffffb05054e0 (most recent call first): >>> <no Python frame> >>> >>> Extension modules: perf_trace_context, systemd._journal, >>> systemd._reader, systemd.id128, report._py3report, _dbus_bindings, >>> problem._py3abrt (total: 7) >>> Aborted (core dumped) >>> >>>> >>>>> Signed-off-by: Ganapatrao Kulkarni >>>>> <gankulkarni(a)os.amperecomputing.com> >>>>> --- >>>>> tools/perf/scripts/python/arm-cs-trace-disasm.py | 10 ++++++++++ >>>>> 1 file changed, 10 insertions(+) >>>>> >>>>> diff --git a/tools/perf/scripts/python/arm-cs-trace-disasm.py >>>>> b/tools/perf/scripts/python/arm-cs-trace-disasm.py >>>>> index d973c2baed1c..ad10cee2c35e 100755 >>>>> --- a/tools/perf/scripts/python/arm-cs-trace-disasm.py >>>>> +++ b/tools/perf/scripts/python/arm-cs-trace-disasm.py >>>>> @@ -198,6 +198,10 @@ def process_event(param_dict): >>>>> cpu_data[str(cpu) + 'addr'] = addr >>>>> return >>>>> + if (cpu_data.get(str(cpu) + 'ip') == None): >>>>> + cpu_data[str(cpu) + 'ip'] = ip >>>>> + >>>> >>>> Do you need to write into the global cpu_data here? Doesn't it get >>>> overwritten after you load it back into 'prev_ip' >>> >>> No, the logic is same as holding the addr of previous packet. >>> Saving the previous packet saved ip in to prev_ip before overwriting >>> with the current packet. >> >> It's not exactly the same logic as holding the addr of the previous >> sample. For addr, we return on the first None, with your change we now >> "pretend" that the second one is also the previous one: >> >> if (cpu_data.get(str(cpu) + 'addr') == None): >> cpu_data[str(cpu) + 'addr'] = addr >> return <----------------------------sample 0 return >> >> if (cpu_data.get(str(cpu) + 'ip') == None): >> cpu_data[str(cpu) + 'ip'] = ip <---- sample 1 save but no return >> >> Then for sample 1 'prev_ip' is actually now the 'current' IP: > > Yes, it is dummy for first packet. Added anticipating that we wont hit > the discontinuity for the first packet itself. > > Can this be changed to more intuitive like below? > > diff --git a/tools/perf/scripts/python/arm-cs-trace-disasm.py > b/tools/perf/scripts/python/arm-cs-trace-disasm.py > index d973c2baed1c..d49f5090059f 100755 > --- a/tools/perf/scripts/python/arm-cs-trace-disasm.py > +++ b/tools/perf/scripts/python/arm-cs-trace-disasm.py > @@ -198,6 +198,8 @@ def process_event(param_dict): > cpu_data[str(cpu) + 'addr'] = addr > return > > + if (cpu_data.get(str(cpu) + 'ip') != None): > + prev_ip = cpu_data[str(cpu) + 'ip'] > > if (options.verbose == True): > print("Event type: %s" % name) > @@ -243,12 +245,18 @@ def process_event(param_dict): > > # Record for previous sample packet > cpu_data[str(cpu) + 'addr'] = addr > + cpu_data[str(cpu) + 'ip'] = stop_addr > > # Handle CS_ETM_TRACE_ON packet if start_addr=0 and stop_addr=4 > if (start_addr == 0 and stop_addr == 4): > print("CPU%d: CS_ETM_TRACE_ON packet is inserted" % cpu) > return > > + if (stop_addr < start_addr and prev_ip != 0): > + # Continuity of the Packets broken, set start_addr to > previous > + # packet ip to complete the remaining tracing of the > address range. > + start_addr = prev_ip > + > if (start_addr < int(dso_start) or start_addr > int(dso_end)): > print("Start address 0x%x is out of range [ 0x%x .. > 0x%x ] for dso %s" % (start_addr, int(dso_start), int(dso_end), dso)) > return > > Without this patch below is the failure log(with segfault) for reference. > > [root@sut01sys-r214 perf]# timeout 4s ./perf record -e cs_etm// -C 1 dd > if=/dev/zero of=/dev/null > [ perf record: Woken up 1 times to write data ] > [ perf record: Captured and wrote 1.087 MB perf.data ] > [root@sut01sys-r214 perf]# ./perf script > --script=python:./scripts/python/arm-cs-trace-disasm.py -- -d objdump -k > ../../vmlinux -v $* > dump > objdump: error: the stop address should be after the start address > Traceback (most recent call last): > File "./scripts/python/arm-cs-trace-disasm.py", line 271, in > process_event > print_disam(dso_fname, dso_vm_start, start_addr, stop_addr) > File "./scripts/python/arm-cs-trace-disasm.py", line 105, in print_disam > for line in read_disam(dso_fname, dso_start, start_addr, stop_addr): > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > File "./scripts/python/arm-cs-trace-disasm.py", line 99, in read_disam > disasm_output = check_output(disasm).decode('utf-8').split('\n') > ^^^^^^^^^^^^^^^^^^^^ > File "/usr/lib64/python3.12/subprocess.py", line 466, in check_output > return run(*popenargs, stdout=PIPE, timeout=timeout, check=True, > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > File "/usr/lib64/python3.12/subprocess.py", line 571, in run > raise CalledProcessError(retcode, process.args, > subprocess.CalledProcessError: Command '['objdump', '-d', '-z', > '--start-address=0xffff80008125b758', > '--stop-address=0xffff80008125a934', '../../vmlinux']' returned non-zero > exit status 1. > Fatal Python error: handler_call_die: problem in Python trace event handler > Python runtime state: initialized > > Current thread 0x0000ffffb90d54e0 (most recent call first): > <no Python frame> > > Extension modules: perf_trace_context, systemd._journal, > systemd._reader, systemd.id128, report._py3report, _dbus_bindings, > problem._py3abrt (total: 7) > Aborted (core dumped) > > > dump snippet: > ============ > Event type: branches > Sample = { cpu: 0001 addr: 0xffff80008030cb00 phys_addr: > 0x0000000000000000 ip: 0xffff800080313f0c pid: 12720 tid: 12720 period: > 1 time: 5986372298040 } > ffff800080313f04 <__perf_event_header__init_id+0x4c>: > ffff800080313f04: 36100094 tbz w20, #2, > ffff800080313f14 <__perf_event_header__init_id+0x5c> > ffff800080313f08: f941e6a0 ldr x0, [x21, #968] > ffff800080313f0c: d63f0000 blr x0 > perf 12720/12720 [0001] 5986.372298040 > __perf_event_header__init_id+0x54 > .../coresight/linux/kernel/events/core.c 586 return > event->clock(); > Event type: branches > Sample = { cpu: 0001 addr: 0xffff8000801bb4a8 phys_addr: > 0x0000000000000000 ip: 0xffff80008030cb0c pid: 12720 tid: 12720 period: > 1 time: 5986372298040 } > ffff80008030cb00 <local_clock>: > ffff80008030cb00: d503233f paciasp > ffff80008030cb04: a9bf7bfd stp x29, x30, [sp, > #-16]! > ffff80008030cb08: 910003fd mov x29, sp > ffff80008030cb0c: 97faba67 bl ffff8000801bb4a8 > <sched_clock> > perf 12720/12720 [0001] 5986.372298040 local_clock+0xc > ...t/linux/./include/linux/sched/clock.h 64 return sched_clock(); > Event type: branches > Sample = { cpu: 0001 addr: 0xffff80008125a8a8 phys_addr: > 0x0000000000000000 ip: 0xffff8000801bb4c8 pid: 12720 tid: 12720 period: > 1 time: 5986372298040 } > ffff8000801bb4a8 <sched_clock>: > ffff8000801bb4a8: d503233f paciasp > ffff8000801bb4ac: a9be7bfd stp x29, x30, [sp, > #-32]! > ffff8000801bb4b0: 910003fd mov x29, sp > ffff8000801bb4b4: a90153f3 stp x19, x20, [sp, > #16] > ffff8000801bb4b8: d5384113 mrs x19, sp_el0 > ffff8000801bb4bc: b9401260 ldr w0, [x19, #16] > ffff8000801bb4c0: 11000400 add w0, w0, #0x1 > ffff8000801bb4c4: b9001260 str w0, [x19, #16] > ffff8000801bb4c8: 94427cf8 bl ffff80008125a8a8 > <sched_clock_noinstr> > perf 12720/12720 [0001] 5986.372298040 > sched_clock+0x20 ...sight/linux/kernel/time/sched_clock.c 105 > ns = sched_clock_noinstr(); > Event type: branches > Sample = { cpu: 0001 addr: 0xffff80008125b758 phys_addr: > 0x0000000000000000 ip: 0xffff80008125a8e4 pid: 12720 tid: 12720 period: > 1 time: 5986372298040 } > ffff80008125a8a8 <sched_clock_noinstr>: > ffff80008125a8a8: d503233f paciasp > ffff80008125a8ac: a9bc7bfd stp x29, x30, [sp, > #-64]! > ffff80008125a8b0: 910003fd mov x29, sp > ffff80008125a8b4: a90153f3 stp x19, x20, [sp, > #16] > ffff80008125a8b8: b000e354 adrp x20, > ffff800082ec3000 <tick_bc_dev+0x140> > ffff80008125a8bc: 910d0294 add x20, x20, #0x340 > ffff80008125a8c0: a90363f7 stp x23, x24, [sp, > #48] > ffff80008125a8c4: 91002297 add x23, x20, #0x8 > ffff80008125a8c8: 52800518 mov w24, #0x28 > // #40 > ffff80008125a8cc: a9025bf5 stp x21, x22, [sp, > #32] > ffff80008125a8d0: b9400296 ldr w22, [x20] > ffff80008125a8d4: 120002d5 and w21, w22, #0x1 > ffff80008125a8d8: 9bb87eb5 umull x21, w21, w24 > ffff80008125a8dc: 8b1502f3 add x19, x23, x21 > ffff80008125a8e0: f9400e60 ldr x0, [x19, #24] > ffff80008125a8e4: d63f0000 blr x0 > perf 12720/12720 [0001] 5986.372298040 > sched_clock_noinstr+0x3c ...sight/linux/kernel/time/sched_clock.c > 93 cyc = (rd->read_sched_clock() - rd->epoch_cyc) & > Event type: branches > Sample = { cpu: 0001 addr: 0xffff8000801bb4cc phys_addr: > 0x0000000000000000 ip: 0xffff80008125a930 pid: 12720 tid: 12720 period: > 1 time: 5986372298040 } > > > With fix: > ========= > > Event type: branches > Sample = { cpu: 0001 addr: 0xffff80008030cb00 phys_addr: > 0x0000000000000000 ip: 0xffff800080313f0c pid: 12720 tid: 12720 period: > 1 time: 5986372298040 } > ffff800080313f04 <__perf_event_header__init_id+0x4c>: > ffff800080313f04: 36100094 tbz w20, #2, > ffff800080313f14 <__perf_event_header__init_id+0x5c> > ffff800080313f08: f941e6a0 ldr x0, [x21, #968] > ffff800080313f0c: d63f0000 blr x0 > perf 12720/12720 [0001] 5986.372298040 > __perf_event_header__init_id+0x54 > .../coresight/linux/kernel/events/core.c 586 return > event->clock(); > Event type: branches > Sample = { cpu: 0001 addr: 0xffff8000801bb4a8 phys_addr: > 0x0000000000000000 ip: 0xffff80008030cb0c pid: 12720 tid: 12720 period: > 1 time: 5986372298040 } > ffff80008030cb00 <local_clock>: > ffff80008030cb00: d503233f paciasp > ffff80008030cb04: a9bf7bfd stp x29, x30, [sp, > #-16]! > ffff80008030cb08: 910003fd mov x29, sp > ffff80008030cb0c: 97faba67 bl ffff8000801bb4a8 > <sched_clock> > perf 12720/12720 [0001] 5986.372298040 local_clock+0xc > ...t/linux/./include/linux/sched/clock.h 64 return sched_clock(); > Event type: branches > Sample = { cpu: 0001 addr: 0xffff80008125a8a8 phys_addr: > 0x0000000000000000 ip: 0xffff8000801bb4c8 pid: 12720 tid: 12720 period: > 1 time: 5986372298040 } > ffff8000801bb4a8 <sched_clock>: > ffff8000801bb4a8: d503233f paciasp > ffff8000801bb4ac: a9be7bfd stp x29, x30, [sp, > #-32]! > ffff8000801bb4b0: 910003fd mov x29, sp > ffff8000801bb4b4: a90153f3 stp x19, x20, [sp, > #16] > ffff8000801bb4b8: d5384113 mrs x19, sp_el0 > ffff8000801bb4bc: b9401260 ldr w0, [x19, #16] > ffff8000801bb4c0: 11000400 add w0, w0, #0x1 > ffff8000801bb4c4: b9001260 str w0, [x19, #16] > ffff8000801bb4c8: 94427cf8 bl ffff80008125a8a8 > <sched_clock_noinstr> > perf 12720/12720 [0001] 5986.372298040 > sched_clock+0x20 ...sight/linux/kernel/time/sched_clock.c 105 > ns = sched_clock_noinstr(); > Event type: branches > Sample = { cpu: 0001 addr: 0xffff80008125b758 phys_addr: > 0x0000000000000000 ip: 0xffff80008125a8e4 pid: 12720 tid: 12720 period: > 1 time: 5986372298040 } > ffff80008125a8a8 <sched_clock_noinstr>: > ffff80008125a8a8: d503233f paciasp > ffff80008125a8ac: a9bc7bfd stp x29, x30, [sp, > #-64]! > ffff80008125a8b0: 910003fd mov x29, sp > ffff80008125a8b4: a90153f3 stp x19, x20, [sp, > #16] > ffff80008125a8b8: b000e354 adrp x20, > ffff800082ec3000 <tick_bc_dev+0x140> > ffff80008125a8bc: 910d0294 add x20, x20, #0x340 > ffff80008125a8c0: a90363f7 stp x23, x24, [sp, > #48] > ffff80008125a8c4: 91002297 add x23, x20, #0x8 > ffff80008125a8c8: 52800518 mov w24, #0x28 > // #40 > ffff80008125a8cc: a9025bf5 stp x21, x22, [sp, > #32] > ffff80008125a8d0: b9400296 ldr w22, [x20] > ffff80008125a8d4: 120002d5 and w21, w22, #0x1 > ffff80008125a8d8: 9bb87eb5 umull x21, w21, w24 > ffff80008125a8dc: 8b1502f3 add x19, x23, x21 > ffff80008125a8e0: f9400e60 ldr x0, [x19, #24] > ffff80008125a8e4: d63f0000 blr x0 It looks like the disassembly now assumes this BLR wasn't taken. We go from ffff80008125a8e4 straight through to ... > perf 12720/12720 [0001] 5986.372298040 > sched_clock_noinstr+0x3c ...sight/linux/kernel/time/sched_clock.c > 93 cyc = (rd->read_sched_clock() - rd->epoch_cyc) & > Event type: branches > Sample = { cpu: 0001 addr: 0xffff8000801bb4cc phys_addr: > 0x0000000000000000 ip: 0xffff80008125a930 pid: 12720 tid: 12720 period: > 1 time: 5986372298040 } > ffff80008125a8e8 <sched_clock_noinstr+0x40>: > ffff80008125a8e8: f8756ae3 ldr x3, [x23, x21] ffff80008125a8e4 which is just the previous one +4. Isn't your issue actually a decode issue in Perf itself? Why is there a discontinuity without branch samples being generated where either the source or destination address is 0? What are your record options to create this issue? As I mentioned in the previous reply I haven't been able to reproduce it.

11 months

[PATCH] perf scripts python: cs-etm: Restore first sample log in verbose mode

by James Clark

The linked commit moved the early return on the first sample to before the verbose log, so move the log earlier too. Now the first sample is also logged and not skipped. Fixes: 2d98dbb4c9c5 ("perf scripts python arm-cs-trace-disasm.py: Do not ignore disam first sample") Signed-off-by: James Clark <james.clark(a)linaro.org> --- tools/perf/scripts/python/arm-cs-trace-disasm.py | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/tools/perf/scripts/python/arm-cs-trace-disasm.py b/tools/perf/scripts/python/arm-cs-trace-disasm.py index d973c2baed1c..7aff02d84ffb 100755 --- a/tools/perf/scripts/python/arm-cs-trace-disasm.py +++ b/tools/perf/scripts/python/arm-cs-trace-disasm.py @@ -192,17 +192,16 @@ def process_event(param_dict): ip = sample["ip"] addr = sample["addr"] + if (options.verbose == True): + print("Event type: %s" % name) + print_sample(sample) + # Initialize CPU data if it's empty, and directly return back # if this is the first tracing event for this CPU. if (cpu_data.get(str(cpu) + 'addr') == None): cpu_data[str(cpu) + 'addr'] = addr return - - if (options.verbose == True): - print("Event type: %s" % name) - print_sample(sample) - # If cannot find dso so cannot dump assembler, bail out if (dso == '[unknown]'): return -- 2.34.1

11 months

Re: [PATCH] perf scripts python arm-cs-trace-disasm.py: Skip disasm if address continuity is broken

by James Clark

On 22/07/2024 11:02 am, Ganapatrao Kulkarni wrote: > > Hi James, > > On 19-07-2024 08:09 pm, James Clark wrote: >> >> >> On 19/07/2024 10:26 am, Ganapatrao Kulkarni wrote: >>> To generate the instruction tracing, script uses 2 contiguous packets >>> address range. If there a continuity brake due to discontiguous branch >>> address, it is required to reset the tracing and start tracing with the >>> new set of contiguous packets. >>> >>> Adding change to identify the break and complete the remaining tracing >>> of current packets and restart tracing from new set of packets, if >>> continuity is established. >>> >> >> Hi Ganapatrao, >> >> Can you add a before and after example of what's changed to the commit >> message? It wasn't immediately obvious to me if this is adding missing >> output, or it was correcting the tail end of the output that was >> previously wrong. > > It is adding tail end of the trace as well avoiding the segfault of the > perf application. With out this change the perf segfaults with as below log > > > ./perf script --script=python:./scripts/python/arm-cs-trace-disasm.py -- > -d objdump -k ../../vmlinux -v $* > dump > objdump: error: the stop address should be after the start address > Traceback (most recent call last): > File "./scripts/python/arm-cs-trace-disasm.py", line 271, in > process_event > print_disam(dso_fname, dso_vm_start, start_addr, stop_addr) > File "./scripts/python/arm-cs-trace-disasm.py", line 105, in print_disam > for line in read_disam(dso_fname, dso_start, start_addr, stop_addr): > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > File "./scripts/python/arm-cs-trace-disasm.py", line 99, in read_disam > disasm_output = check_output(disasm).decode('utf-8').split('\n') > ^^^^^^^^^^^^^^^^^^^^ > File "/usr/lib64/python3.12/subprocess.py", line 466, in check_output > return run(*popenargs, stdout=PIPE, timeout=timeout, check=True, > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > File "/usr/lib64/python3.12/subprocess.py", line 571, in run > raise CalledProcessError(retcode, process.args, > subprocess.CalledProcessError: Command '['objdump', '-d', '-z', > '--start-address=0xffff80008125b758', > '--stop-address=0xffff80008125a934', '../../vmlinux']' returned non-zero > exit status 1. > Fatal Python error: handler_call_die: problem in Python trace event handler > Python runtime state: initialized > > Current thread 0x0000ffffb05054e0 (most recent call first): > <no Python frame> > > Extension modules: perf_trace_context, systemd._journal, > systemd._reader, systemd.id128, report._py3report, _dbus_bindings, > problem._py3abrt (total: 7) > Aborted (core dumped) > >> >>> Signed-off-by: Ganapatrao Kulkarni <gankulkarni(a)os.amperecomputing.com> >>> --- >>> tools/perf/scripts/python/arm-cs-trace-disasm.py | 10 ++++++++++ >>> 1 file changed, 10 insertions(+) >>> >>> diff --git a/tools/perf/scripts/python/arm-cs-trace-disasm.py >>> b/tools/perf/scripts/python/arm-cs-trace-disasm.py >>> index d973c2baed1c..ad10cee2c35e 100755 >>> --- a/tools/perf/scripts/python/arm-cs-trace-disasm.py >>> +++ b/tools/perf/scripts/python/arm-cs-trace-disasm.py >>> @@ -198,6 +198,10 @@ def process_event(param_dict): >>> cpu_data[str(cpu) + 'addr'] = addr >>> return >>> + if (cpu_data.get(str(cpu) + 'ip') == None): >>> + cpu_data[str(cpu) + 'ip'] = ip >>> + >> >> Do you need to write into the global cpu_data here? Doesn't it get >> overwritten after you load it back into 'prev_ip' > > No, the logic is same as holding the addr of previous packet. > Saving the previous packet saved ip in to prev_ip before overwriting > with the current packet. It's not exactly the same logic as holding the addr of the previous sample. For addr, we return on the first None, with your change we now "pretend" that the second one is also the previous one: if (cpu_data.get(str(cpu) + 'addr') == None): cpu_data[str(cpu) + 'addr'] = addr return <----------------------------sample 0 return if (cpu_data.get(str(cpu) + 'ip') == None): cpu_data[str(cpu) + 'ip'] = ip <---- sample 1 save but no return Then for sample 1 'prev_ip' is actually now the 'current' IP: prev_ip = cpu_data[str(cpu) + 'ip'] This means that prev_ip is sometimes the previous sample's IP only sometimes (samples following 1), otherwise it's the current IP. Does your fix actually require this bit? Because we already save the 'real' previous one: cpu_data[str(cpu) + 'ip'] = stop_addr Also normally we save ip + 4 (stop_addr), where as you save ip. It's not clear why there is no need to add the 4? >> >> prev_ip = cpu_data[str(cpu) + 'ip'] >> >> ... then ... >> >> # Record for previous sample packet >> cpu_data[str(cpu) + 'addr'] = addr >> cpu_data[str(cpu) + 'ip'] = stop_addr >> >> Would a local variable not accomplish the same thing? > > No, We need global to hold the ip of previous packet. >> >>> + prev_ip = cpu_data[str(cpu) + 'ip'] >>> if (options.verbose == True): >>> print("Event type: %s" % name) >>> @@ -243,12 +247,18 @@ def process_event(param_dict): >>> # Record for previous sample packet >>> cpu_data[str(cpu) + 'addr'] = addr >>> + cpu_data[str(cpu) + 'ip'] = stop_addr >>> # Handle CS_ETM_TRACE_ON packet if start_addr=0 and stop_addr=4 >>> if (start_addr == 0 and stop_addr == 4): >>> print("CPU%d: CS_ETM_TRACE_ON packet is inserted" % cpu) >>> return >>> + if (stop_addr < start_addr): >>> + # Continuity of the Packets broken, set start_addr to previous >>> + # packet ip to complete the remaining tracing of the address >>> range. After looking a bit more I'm also not sure why stop_addr < start_addr signifies a discontinuity. What if the discontinuity ends up with stop_addr > start_addr? There's no reason it can't jump forwards as well as backwards. Can you share the 3 samples from the --verbose output to the script that cause the issue? I see discontinuities as having the branch source (ip) set to 0 which is what we do at the start: Sample = { cpu: 0000 addr: 0x0000ffffb807adac phys_addr: 0x0000000000000000 ip: 0x0000000000000000 pid: 28388 } Then the ending one has the branch target (addr) set to 0: Sample = { cpu: 0000 addr: 0x0000000000000000 phys_addr: 0x0000000000000000 ip: 0x0000ffffb7eee168 pid: 28388 } And it doesn't hit objdump because of the range check: Start address 0x0 is out of range ... So I don't see any missing disassembly or crashes for this. >>> + start_addr = prev_ip >>> + >>> if (start_addr < int(dso_start) or start_addr > int(dso_end)): >>> print("Start address 0x%x is out of range [ 0x%x .. 0x%x ] >>> for dso %s" % (start_addr, int(dso_start), int(dso_end), dso)) >>> return > > Thanks, > Ganapat

11 months

Re: [PATCH v2 1/4] Coresight: Add trace_id function to collect trace ID

by Mike Leach

Hi, This patch has a number of issues:- 1) The new dynamic trace ID patchset to use per sink ID maps makes this set unusable. perf supplies a trace ID map for each sink used. - see https://lists.linaro.org/archives/list/coresight@lists.linaro.org/thread/JE… 2) See etm4_enable_perf() - in the perf context a locked version of the read trace ID cannot be used - therefore any path that calls etm4_read_alloc_trace_id() (or equivalent for other sources) in perf mode may result in lockdep issues. 3) on enable: given a cpu number, the trace ID can be read from the id maps rather than needing a new function in ops 4) on disable: trace id can be read directly from the source driver data - again removing need for a new trace_id function in ops. Regards Mike On Fri, 5 Jul 2024 at 10:01, Jie Gan <quic_jiegan(a)quicinc.com> wrote: > > Add 'trace_id' function pointer in ops. It's responsible for collect the > trace ID of the device. > > Add 'struct cs_sink_data' to store the data used by coresight_enable_path/ > coresight_disable_path. The structure will be transmitted to the helper and > sink device. > > Signed-off-by: Jie Gan <quic_jiegan(a)quicinc.com> > --- > drivers/hwtracing/coresight/coresight-core.c | 53 +++++++++++++++---- > drivers/hwtracing/coresight/coresight-etb10.c | 3 +- > .../hwtracing/coresight/coresight-etm-perf.c | 34 ++++++++++-- > .../coresight/coresight-etm3x-core.c | 14 +++++ > .../coresight/coresight-etm4x-core.c | 13 +++++ > drivers/hwtracing/coresight/coresight-priv.h | 12 ++++- > drivers/hwtracing/coresight/coresight-stm.c | 13 +++++ > drivers/hwtracing/coresight/coresight-sysfs.c | 24 +++++++-- > .../hwtracing/coresight/coresight-tmc-etf.c | 3 +- > .../hwtracing/coresight/coresight-tmc-etr.c | 6 ++- > drivers/hwtracing/coresight/coresight-tpda.c | 13 +++++ > drivers/hwtracing/coresight/coresight-trbe.c | 4 +- > drivers/hwtracing/coresight/ultrasoc-smb.c | 3 +- > include/linux/coresight.h | 4 ++ > 14 files changed, 174 insertions(+), 25 deletions(-) > > diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c > index 9fc6f6b863e0..f414e66f4cda 100644 > --- a/drivers/hwtracing/coresight/coresight-core.c > +++ b/drivers/hwtracing/coresight/coresight-core.c > @@ -297,12 +297,12 @@ static int coresight_enable_helper(struct coresight_device *csdev, > return helper_ops(csdev)->enable(csdev, mode, data); > } > > -static void coresight_disable_helper(struct coresight_device *csdev) > +static void coresight_disable_helper(struct coresight_device *csdev, void *data) > { > - helper_ops(csdev)->disable(csdev, NULL); > + helper_ops(csdev)->disable(csdev, data); > } > > -static void coresight_disable_helpers(struct coresight_device *csdev) > +static void coresight_disable_helpers(struct coresight_device *csdev, void *data) > { > int i; > struct coresight_device *helper; > @@ -310,7 +310,7 @@ static void coresight_disable_helpers(struct coresight_device *csdev) > for (i = 0; i < csdev->pdata->nr_outconns; ++i) { > helper = csdev->pdata->out_conns[i]->dest_dev; > if (helper && coresight_is_helper(helper)) > - coresight_disable_helper(helper); > + coresight_disable_helper(helper, data); > } > } > > @@ -327,7 +327,7 @@ static void coresight_disable_helpers(struct coresight_device *csdev) > void coresight_disable_source(struct coresight_device *csdev, void *data) > { > source_ops(csdev)->disable(csdev, data); > - coresight_disable_helpers(csdev); > + coresight_disable_helpers(csdev, NULL); > } > EXPORT_SYMBOL_GPL(coresight_disable_source); > > @@ -337,7 +337,8 @@ EXPORT_SYMBOL_GPL(coresight_disable_source); > * disabled. > */ > static void coresight_disable_path_from(struct list_head *path, > - struct coresight_node *nd) > + struct coresight_node *nd, > + void *sink_data) > { > u32 type; > struct coresight_device *csdev, *parent, *child; > @@ -382,13 +383,13 @@ static void coresight_disable_path_from(struct list_head *path, > } > > /* Disable all helpers adjacent along the path last */ > - coresight_disable_helpers(csdev); > + coresight_disable_helpers(csdev, sink_data); > } > } > > -void coresight_disable_path(struct list_head *path) > +void coresight_disable_path(struct list_head *path, void *sink_data) > { > - coresight_disable_path_from(path, NULL); > + coresight_disable_path_from(path, NULL, sink_data); > } > EXPORT_SYMBOL_GPL(coresight_disable_path); > > @@ -468,10 +469,42 @@ int coresight_enable_path(struct list_head *path, enum cs_mode mode, > out: > return ret; > err: > - coresight_disable_path_from(path, nd); > + coresight_disable_path_from(path, nd, sink_data); > goto out; > } > > +int coresight_read_traceid(struct list_head *path) > +{ > + int trace_id, type; > + struct coresight_device *csdev; > + struct coresight_node *nd; > + > + list_for_each_entry(nd, path, link) { > + csdev = nd->csdev; > + type = csdev->type; > + > + switch(type) { > + case CORESIGHT_DEV_TYPE_SOURCE: > + if (source_ops(csdev)->trace_id != NULL) { > + trace_id = source_ops(csdev)->trace_id(csdev); > + if (trace_id > 0) > + return trace_id; > + } > + break; > + case CORESIGHT_DEV_TYPE_LINK: > + if (link_ops(csdev)->trace_id != NULL) { > + trace_id = link_ops(csdev)->trace_id(csdev); > + if (trace_id > 0) > + return trace_id; > + } > + break; > + default: > + break; > + } > + } > + return -EINVAL; > +} > + > struct coresight_device *coresight_get_sink(struct list_head *path) > { > struct coresight_device *csdev; > diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c > index 7edd3f1d0d46..05e620529c14 100644 > --- a/drivers/hwtracing/coresight/coresight-etb10.c > +++ b/drivers/hwtracing/coresight/coresight-etb10.c > @@ -173,7 +173,8 @@ static int etb_enable_perf(struct coresight_device *csdev, void *data) > pid_t pid; > unsigned long flags; > struct etb_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); > - struct perf_output_handle *handle = data; > + struct cs_sink_data *sink_data = (struct cs_sink_data *)data; > + struct perf_output_handle *handle = sink_data->handle; > struct cs_buffers *buf = etm_perf_sink_config(handle); > > spin_lock_irqsave(&drvdata->spinlock, flags); > diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c > index c0c60e6a1703..8b155765b959 100644 > --- a/drivers/hwtracing/coresight/coresight-etm-perf.c > +++ b/drivers/hwtracing/coresight/coresight-etm-perf.c > @@ -452,6 +452,7 @@ static void etm_event_start(struct perf_event *event, int flags) > struct perf_output_handle *handle = &ctxt->handle; > struct coresight_device *sink, *csdev = per_cpu(csdev_src, cpu); > struct list_head *path; > + struct cs_sink_data *sink_data = NULL; > u64 hw_id; > > if (!csdev) > @@ -490,9 +491,18 @@ static void etm_event_start(struct perf_event *event, int flags) > if (WARN_ON_ONCE(!sink)) > goto fail_end_stop; > > + sink_data = kzalloc(sizeof(*sink_data), GFP_KERNEL); > + if (!sink_data) > + goto fail_end_stop; > + > + sink_data->sink = sink; > + sink_data->traceid = coresight_read_traceid(path); > + sink_data->handle = handle; > /* Nothing will happen without a path */ > - if (coresight_enable_path(path, CS_MODE_PERF, handle)) > + if (coresight_enable_path(path, CS_MODE_PERF, sink_data)) { > + kfree(sink_data); > goto fail_end_stop; > + } > > /* Finally enable the tracer */ > if (source_ops(csdev)->enable(csdev, event, CS_MODE_PERF)) > @@ -511,6 +521,7 @@ static void etm_event_start(struct perf_event *event, int flags) > perf_report_aux_output_id(event, hw_id); > } > > + kfree(sink_data); > out: > /* Tell the perf core the event is alive */ > event->hw.state = 0; > @@ -519,7 +530,8 @@ static void etm_event_start(struct perf_event *event, int flags) > return; > > fail_disable_path: > - coresight_disable_path(path); > + coresight_disable_path(path, sink_data); > + kfree(sink_data); > fail_end_stop: > /* > * Check if the handle is still associated with the event, > @@ -544,6 +556,7 @@ static void etm_event_stop(struct perf_event *event, int mode) > struct perf_output_handle *handle = &ctxt->handle; > struct etm_event_data *event_data; > struct list_head *path; > + struct cs_sink_data *sink_data = NULL; > > /* > * If we still have access to the event_data via handle, > @@ -588,6 +601,10 @@ static void etm_event_stop(struct perf_event *event, int mode) > if (!sink) > return; > > + sink_data = kzalloc(sizeof(*sink_data), GFP_KERNEL); > + if (!sink_data) > + return; > + > /* stop tracer */ > coresight_disable_source(csdev, event); > > @@ -601,12 +618,16 @@ static void etm_event_stop(struct perf_event *event, int mode) > * have to do anything here. > */ > if (handle->event && (mode & PERF_EF_UPDATE)) { > - if (WARN_ON_ONCE(handle->event != event)) > + if (WARN_ON_ONCE(handle->event != event)) { > + kfree(sink_data); > return; > + } > > /* update trace information */ > - if (!sink_ops(sink)->update_buffer) > + if (!sink_ops(sink)->update_buffer) { > + kfree(sink_data); > return; > + } > > size = sink_ops(sink)->update_buffer(sink, handle, > event_data->snk_config); > @@ -627,8 +648,11 @@ static void etm_event_stop(struct perf_event *event, int mode) > WARN_ON(size); > } > > + sink_data->sink = sink; > + sink_data->traceid = coresight_read_traceid(path); > /* Disabling the path make its elements available to other sessions */ > - coresight_disable_path(path); > + coresight_disable_path(path, sink_data); > + kfree(sink_data); > } > > static int etm_event_add(struct perf_event *event, int mode) > diff --git a/drivers/hwtracing/coresight/coresight-etm3x-core.c b/drivers/hwtracing/coresight/coresight-etm3x-core.c > index 8b362605d242..27e973749050 100644 > --- a/drivers/hwtracing/coresight/coresight-etm3x-core.c > +++ b/drivers/hwtracing/coresight/coresight-etm3x-core.c > @@ -696,10 +696,24 @@ static void etm_disable(struct coresight_device *csdev, > coresight_set_mode(csdev, CS_MODE_DISABLED); > } > > +static int etm_trace_id(struct coresight_device *csdev) > +{ > + struct etm_drvdata *drvdata; > + > + if (csdev == NULL) > + return -EINVAL; > + > + drvdata = dev_get_drvdata(csdev->dev.parent); > + > + return etm_read_alloc_trace_id(drvdata); > +} > + > + > static const struct coresight_ops_source etm_source_ops = { > .cpu_id = etm_cpu_id, > .enable = etm_enable, > .disable = etm_disable, > + .trace_id = etm_trace_id, > }; > > static const struct coresight_ops etm_cs_ops = { > diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c > index bf01f01964cf..8c3e9bfb9a9c 100644 > --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c > +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c > @@ -1024,10 +1024,23 @@ static void etm4_disable(struct coresight_device *csdev, > coresight_set_mode(csdev, CS_MODE_DISABLED); > } > > +static int etm4_trace_id(struct coresight_device *csdev) > +{ > + struct etmv4_drvdata *drvdata; > + > + if (csdev == NULL) > + return -EINVAL; > + > + drvdata = dev_get_drvdata(csdev->dev.parent); > + > + return etm4_read_alloc_trace_id(drvdata); > +} > + > static const struct coresight_ops_source etm4_source_ops = { > .cpu_id = etm4_cpu_id, > .enable = etm4_enable, > .disable = etm4_disable, > + .trace_id = etm4_trace_id, > }; > > static const struct coresight_ops etm4_cs_ops = { > diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h > index 61a46d3bdcc8..e2576531f796 100644 > --- a/drivers/hwtracing/coresight/coresight-priv.h > +++ b/drivers/hwtracing/coresight/coresight-priv.h > @@ -105,6 +105,15 @@ struct cs_buffers { > void **data_pages; > }; > > +/** > + * struct cs_sink_data - data used by coresight_enable_path/coresight_disable_path > + */ > +struct cs_sink_data { > + struct perf_output_handle *handle; > + struct coresight_device *sink; > + u32 traceid; > +}; > + > static inline void coresight_insert_barrier_packet(void *buf) > { > if (buf) > @@ -129,9 +138,10 @@ static inline void CS_UNLOCK(void __iomem *addr) > } while (0); > } > > -void coresight_disable_path(struct list_head *path); > +void coresight_disable_path(struct list_head *path, void *sink_data); > int coresight_enable_path(struct list_head *path, enum cs_mode mode, > void *sink_data); > +int coresight_read_traceid(struct list_head *path); > struct coresight_device *coresight_get_sink(struct list_head *path); > struct coresight_device *coresight_get_sink_by_id(u32 id); > struct coresight_device * > diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c > index 117dbb484543..3817743fc0c6 100644 > --- a/drivers/hwtracing/coresight/coresight-stm.c > +++ b/drivers/hwtracing/coresight/coresight-stm.c > @@ -280,9 +280,22 @@ static void stm_disable(struct coresight_device *csdev, > } > } > > +static int stm_trace_id(struct coresight_device *csdev) > +{ > + struct stm_drvdata *drvdata; > + > + if (csdev == NULL) > + return -EINVAL; > + > + drvdata = dev_get_drvdata(csdev->dev.parent); > + > + return drvdata->traceid; > +} > + > static const struct coresight_ops_source stm_source_ops = { > .enable = stm_enable, > .disable = stm_disable, > + .trace_id = stm_trace_id, > }; > > static const struct coresight_ops stm_cs_ops = { > diff --git a/drivers/hwtracing/coresight/coresight-sysfs.c b/drivers/hwtracing/coresight/coresight-sysfs.c > index 1e67cc7758d7..a95afc890587 100644 > --- a/drivers/hwtracing/coresight/coresight-sysfs.c > +++ b/drivers/hwtracing/coresight/coresight-sysfs.c > @@ -167,6 +167,7 @@ int coresight_enable_sysfs(struct coresight_device *csdev) > int cpu, ret = 0; > struct coresight_device *sink; > struct list_head *path; > + struct cs_sink_data *sink_data; > enum coresight_dev_subtype_source subtype; > u32 hash; > > @@ -208,7 +209,14 @@ int coresight_enable_sysfs(struct coresight_device *csdev) > goto out; > } > > - ret = coresight_enable_path(path, CS_MODE_SYSFS, NULL); > + sink_data = kzalloc(sizeof(*sink_data), GFP_KERNEL); > + if (!sink_data) { > + ret = -ENOMEM; > + goto out; > + } > + sink_data->traceid = coresight_read_traceid(path); > + sink_data->sink = sink; > + ret = coresight_enable_path(path, CS_MODE_SYSFS, sink_data); > if (ret) > goto err_path; > > @@ -245,15 +253,17 @@ int coresight_enable_sysfs(struct coresight_device *csdev) > break; > } > > + kfree(sink_data); > out: > mutex_unlock(&coresight_mutex); > return ret; > > err_source: > - coresight_disable_path(path); > + coresight_disable_path(path, sink_data); > > err_path: > coresight_release_path(path); > + kfree(sink_data); > goto out; > } > EXPORT_SYMBOL_GPL(coresight_enable_sysfs); > @@ -262,6 +272,7 @@ void coresight_disable_sysfs(struct coresight_device *csdev) > { > int cpu, ret; > struct list_head *path = NULL; > + struct cs_sink_data *sink_data = NULL; > u32 hash; > > mutex_lock(&coresight_mutex); > @@ -273,6 +284,10 @@ void coresight_disable_sysfs(struct coresight_device *csdev) > if (!coresight_disable_source_sysfs(csdev, NULL)) > goto out; > > + sink_data = kzalloc(sizeof(*sink_data), GFP_KERNEL); > + if (!sink_data) > + goto out; > + > switch (csdev->subtype.source_subtype) { > case CORESIGHT_DEV_SUBTYPE_SOURCE_PROC: > cpu = source_ops(csdev)->cpu_id(csdev); > @@ -296,8 +311,11 @@ void coresight_disable_sysfs(struct coresight_device *csdev) > break; > } > > - coresight_disable_path(path); > + sink_data->sink = coresight_find_activated_sysfs_sink(csdev); > + sink_data->traceid = coresight_read_traceid(path); > + coresight_disable_path(path, sink_data); > coresight_release_path(path); > + kfree(sink_data); > > out: > mutex_unlock(&coresight_mutex); > diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c > index d4f641cd9de6..7dc536eba3e2 100644 > --- a/drivers/hwtracing/coresight/coresight-tmc-etf.c > +++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c > @@ -250,7 +250,8 @@ static int tmc_enable_etf_sink_perf(struct coresight_device *csdev, void *data) > pid_t pid; > unsigned long flags; > struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); > - struct perf_output_handle *handle = data; > + struct cs_sink_data *sink_data = (struct cs_sink_data *)data; > + struct perf_output_handle *handle = sink_data->handle; > struct cs_buffers *buf = etm_perf_sink_config(handle); > > spin_lock_irqsave(&drvdata->spinlock, flags); > diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c > index e75428fa1592..0c24520645e2 100644 > --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c > +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c > @@ -1253,7 +1253,8 @@ static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev) > struct etr_buf *tmc_etr_get_buffer(struct coresight_device *csdev, > enum cs_mode mode, void *data) > { > - struct perf_output_handle *handle = data; > + struct cs_sink_data *sink_data = (struct cs_sink_data *)data; > + struct perf_output_handle *handle = sink_data->handle; > struct etr_perf_buffer *etr_perf; > > switch (mode) { > @@ -1647,7 +1648,8 @@ static int tmc_enable_etr_sink_perf(struct coresight_device *csdev, void *data) > pid_t pid; > unsigned long flags; > struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); > - struct perf_output_handle *handle = data; > + struct cs_sink_data *sink_data = (struct cs_sink_data *)data; > + struct perf_output_handle *handle = sink_data->handle; > struct etr_perf_buffer *etr_perf = etm_perf_sink_config(handle); > > spin_lock_irqsave(&drvdata->spinlock, flags); > diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c > index bfca103f9f84..20f0ab73159c 100644 > --- a/drivers/hwtracing/coresight/coresight-tpda.c > +++ b/drivers/hwtracing/coresight/coresight-tpda.c > @@ -232,9 +232,22 @@ static void tpda_disable(struct coresight_device *csdev, > dev_dbg(drvdata->dev, "TPDA inport %d disabled\n", in->dest_port); > } > > +static int tpda_trace_id(struct coresight_device *csdev) > +{ > + struct tpda_drvdata *drvdata; > + > + if (csdev == NULL) > + return -EINVAL; > + > + drvdata = dev_get_drvdata(csdev->dev.parent); > + > + return drvdata->atid; > +} > + > static const struct coresight_ops_link tpda_link_ops = { > .enable = tpda_enable, > .disable = tpda_disable, > + .trace_id = tpda_trace_id, > }; > > static const struct coresight_ops tpda_cs_ops = { > diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c > index 96a32b213669..7f4560b067a8 100644 > --- a/drivers/hwtracing/coresight/coresight-trbe.c > +++ b/drivers/hwtracing/coresight/coresight-trbe.c > @@ -21,6 +21,7 @@ > > #include "coresight-self-hosted-trace.h" > #include "coresight-trbe.h" > +#include "coresight-priv.h" > > #define PERF_IDX2OFF(idx, buf) ((idx) % ((buf)->nr_pages << PAGE_SHIFT)) > > @@ -1012,7 +1013,8 @@ static int arm_trbe_enable(struct coresight_device *csdev, enum cs_mode mode, > { > struct trbe_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); > struct trbe_cpudata *cpudata = dev_get_drvdata(&csdev->dev); > - struct perf_output_handle *handle = data; > + struct cs_sink_data *sink_data = (struct cs_sink_data *)data; > + struct perf_output_handle *handle = sink_data->handle; > struct trbe_buf *buf = etm_perf_sink_config(handle); > > WARN_ON(cpudata->cpu != smp_processor_id()); > diff --git a/drivers/hwtracing/coresight/ultrasoc-smb.c b/drivers/hwtracing/coresight/ultrasoc-smb.c > index f9ebf20c91e6..92d8a9fb844e 100644 > --- a/drivers/hwtracing/coresight/ultrasoc-smb.c > +++ b/drivers/hwtracing/coresight/ultrasoc-smb.c > @@ -217,7 +217,8 @@ static void smb_enable_sysfs(struct coresight_device *csdev) > static int smb_enable_perf(struct coresight_device *csdev, void *data) > { > struct smb_drv_data *drvdata = dev_get_drvdata(csdev->dev.parent); > - struct perf_output_handle *handle = data; > + struct cs_sink_data *sink_data = (struct cs_sink_data *)data; > + struct perf_output_handle *handle = sink_data->handle; > struct cs_buffers *buf = etm_perf_sink_config(handle); > pid_t pid; > > diff --git a/include/linux/coresight.h b/include/linux/coresight.h > index f09ace92176e..fb1c225076a5 100644 > --- a/include/linux/coresight.h > +++ b/include/linux/coresight.h > @@ -344,6 +344,7 @@ struct coresight_ops_sink { > * Operations available for links. > * @enable: enables flow between iport and oport. > * @disable: disables flow between iport and oport. > + * @trace_id: Collect the traceid. > */ > struct coresight_ops_link { > int (*enable)(struct coresight_device *csdev, > @@ -352,6 +353,7 @@ struct coresight_ops_link { > void (*disable)(struct coresight_device *csdev, > struct coresight_connection *in, > struct coresight_connection *out); > + int (*trace_id)(struct coresight_device *csdev); > }; > > /** > @@ -361,6 +363,7 @@ struct coresight_ops_link { > * is associated to. > * @enable: enables tracing for a source. > * @disable: disables tracing for a source. > + * @trace_id: collect the traceid. > */ > struct coresight_ops_source { > int (*cpu_id)(struct coresight_device *csdev); > @@ -368,6 +371,7 @@ struct coresight_ops_source { > enum cs_mode mode); > void (*disable)(struct coresight_device *csdev, > struct perf_event *event); > + int (*trace_id)(struct coresight_device *csdev); > }; > > /** > -- > 2.34.1 > -- Mike Leach Principal Engineer, ARM Ltd. Manchester Design Centre. UK

11 months

[PATCH v3 0/3] coresight: Add preferred trace id support

by Mao Jinlong

Some HW has static trace id which cannot be changed via software programming. For this case, configure the trace id in device tree with "arm,trace-id = <xxx>", and call coresight_trace_id_get_system_id with the trace id value in device probe function. The id will be reserved for the HW all the time if the device is probed. Changes since V2: 1. Change "trace-id" to "arm,trace-id". 2. Add trace id flag for getting preferred id or ODD id. Changes since V1: 1. Add argument to coresight_trace_id_get_system_id for preferred id instead of adding new function coresight_trace_id_reserve_system_id. 2. Add constraint to trace-id in dt-binding file. Mao Jinlong (3): dt-bindings: arm: Add arm,trace-id for coresight dummy source coresight: Add support to get preferred id for system trace sources coresight: dummy: Add reserve atid support for dummy source .../sysfs-bus-coresight-devices-dummy-source | 15 +++++ .../arm/arm,coresight-dummy-source.yaml | 6 ++ drivers/hwtracing/coresight/coresight-dummy.c | 59 +++++++++++++++++-- .../hwtracing/coresight/coresight-platform.c | 25 ++++++++ drivers/hwtracing/coresight/coresight-stm.c | 2 +- drivers/hwtracing/coresight/coresight-tpda.c | 2 +- .../hwtracing/coresight/coresight-trace-id.c | 35 +++++++---- .../hwtracing/coresight/coresight-trace-id.h | 11 +++- include/linux/coresight.h | 1 + 9 files changed, 137 insertions(+), 19 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-bus-coresight-devices-dummy-source -- 2.41.0

11 months

Re: [PATCH] perf scripts python arm-cs-trace-disasm.py: Skip disasm if address continuity is broken

by James Clark

On 19/07/2024 10:26 am, Ganapatrao Kulkarni wrote: > To generate the instruction tracing, script uses 2 contiguous packets > address range. If there a continuity brake due to discontiguous branch > address, it is required to reset the tracing and start tracing with the > new set of contiguous packets. > > Adding change to identify the break and complete the remaining tracing > of current packets and restart tracing from new set of packets, if > continuity is established. > Hi Ganapatrao, Can you add a before and after example of what's changed to the commit message? It wasn't immediately obvious to me if this is adding missing output, or it was correcting the tail end of the output that was previously wrong. > Signed-off-by: Ganapatrao Kulkarni <gankulkarni(a)os.amperecomputing.com> > --- > tools/perf/scripts/python/arm-cs-trace-disasm.py | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/tools/perf/scripts/python/arm-cs-trace-disasm.py b/tools/perf/scripts/python/arm-cs-trace-disasm.py > index d973c2baed1c..ad10cee2c35e 100755 > --- a/tools/perf/scripts/python/arm-cs-trace-disasm.py > +++ b/tools/perf/scripts/python/arm-cs-trace-disasm.py > @@ -198,6 +198,10 @@ def process_event(param_dict): > cpu_data[str(cpu) + 'addr'] = addr > return > > + if (cpu_data.get(str(cpu) + 'ip') == None): > + cpu_data[str(cpu) + 'ip'] = ip > + Do you need to write into the global cpu_data here? Doesn't it get overwritten after you load it back into 'prev_ip' prev_ip = cpu_data[str(cpu) + 'ip'] ... then ... # Record for previous sample packet cpu_data[str(cpu) + 'addr'] = addr cpu_data[str(cpu) + 'ip'] = stop_addr Would a local variable not accomplish the same thing? > + prev_ip = cpu_data[str(cpu) + 'ip'] > > if (options.verbose == True): > print("Event type: %s" % name) > @@ -243,12 +247,18 @@ def process_event(param_dict): > > # Record for previous sample packet > cpu_data[str(cpu) + 'addr'] = addr > + cpu_data[str(cpu) + 'ip'] = stop_addr > > # Handle CS_ETM_TRACE_ON packet if start_addr=0 and stop_addr=4 > if (start_addr == 0 and stop_addr == 4): > print("CPU%d: CS_ETM_TRACE_ON packet is inserted" % cpu) > return > > + if (stop_addr < start_addr): > + # Continuity of the Packets broken, set start_addr to previous > + # packet ip to complete the remaining tracing of the address range. > + start_addr = prev_ip > + > if (start_addr < int(dso_start) or start_addr > int(dso_end)): > print("Start address 0x%x is out of range [ 0x%x .. 0x%x ] for dso %s" % (start_addr, int(dso_start), int(dso_end), dso)) > return

11 months, 1 week

[PATCH v5 00/17] coresight: Use per-sink trace ID maps for Perf sessions

by James Clark

This will allow sessions with more than CORESIGHT_TRACE_IDS_MAX ETMs as long as there are fewer than that many ETMs connected to each sink. Each sink owns its own trace ID map, and any Perf session connecting to that sink will allocate from it, even if the sink is currently in use by other users. This is similar to the existing behavior where the dynamic trace IDs are constant as long as there is any concurrent Perf session active. It's not completely optimal because slightly more IDs will be used than necessary, but the optimal solution involves tracking the PIDs of each session and allocating ID maps based on the session owner. This is difficult to do with the combination of per-thread and per-cpu modes and some scheduling issues. The complexity of this isn't likely to worth it because even with multiple users they'd just see a difference in the ordering of ID allocations rather than hitting any limits (unless the hardware does have too many ETMs connected to one sink). Per-thread mode works but only until there are any overlapping IDs, at which point Perf will error out. Both per-thread mode and sysfs mode are left to future changes, but both can be added on top of this initial implementation and only sysfs mode requires further driver changes. The HW_ID version field hasn't been bumped in order to not break Perf which already has an error condition for other values of that field. Instead a new minor version has been added which signifies that there are new fields but the old fields are backwards compatible. Changes since v4: * Fix compilation failure when TRACE_ID_DEBUG is set * Expand comment about not freeing individual trace IDs in free_event_data() Changes since v3: * Fix issue where trace IDs were overwritten by possibly invalid ones by Perf in unformatted mode. Now the HW_IDs are also used for unformatted mode unless the kernel didn't emit any. * Add a commit to check the OpenCSD version. * Add a commit to not save invalid IDs in the Perf header. * Replace cs_etm_queue's formatted and formatted_set members with a single enum which is easier to use. * Drop CORESIGHT_TRACE_ID_UNUSED_FLAG as it's no longer needed. * Add a commit to print the queue number in the raw dump. * Don't assert on the number of unformatted decoders if decoders == 0. Changes since v2: * Rebase on coresight-next 6.10-rc2 (b9b25c8496). * Fix double free of csdev if device registration fails. * Fix leak of coresight_trace_id_perf_start() if trace ID allocation fails. * Don't resend HW_ID for sink changes in per-thread mode. The existing CPU field on AUX records can be used to track this instead. * Tidy function doc for coresight_trace_id_release_all() * Drop first two commits now that they are in coresight-next * Add a commit to make the trace ID spinlock local to the map Changes since V1: * Rename coresight_device.perf_id_map to perf_sink_id_map. * Instead of outputting a HW_ID for each reachable ETM, output the sink ID and continue to output only the HW_ID once for each mapping. * Keep the first two Perf patches so that it applies cleanly on coresight-next, although they have been applied on perf-tools-next * Add new *_map() functions to the trace ID public API instead of modifying existing ones. * Collapse "coresight: Pass trace ID map into source enable" into "coresight: Use per-sink trace ID maps for Perf sessions" because the first commit relied on the default map being accessible which is no longer necessary due to the previous bullet point. James Clark (17): perf: cs-etm: Create decoders after both AUX and HW_ID search passes perf: cs-etm: Allocate queues for all CPUs perf: cs-etm: Move traceid_list to each queue perf: cs-etm: Create decoders based on the trace ID mappings perf: cs-etm: Only save valid trace IDs into files perf: cs-etm: Support version 0.1 of HW_ID packets perf: cs-etm: Print queue number in raw trace dump perf: cs-etm: Add runtime version check for OpenCSD coresight: Remove unused ETM Perf stubs coresight: Clarify comments around the PID of the sink owner coresight: Move struct coresight_trace_id_map to common header coresight: Expose map arguments in trace ID API coresight: Make CPU id map a property of a trace ID map coresight: Use per-sink trace ID maps for Perf sessions coresight: Remove pending trace ID release mechanism coresight: Emit sink ID in the HW_ID packets coresight: Make trace ID map spinlock local to the map drivers/hwtracing/coresight/coresight-core.c | 37 +- drivers/hwtracing/coresight/coresight-dummy.c | 3 +- .../hwtracing/coresight/coresight-etm-perf.c | 43 +- .../hwtracing/coresight/coresight-etm-perf.h | 18 - .../coresight/coresight-etm3x-core.c | 9 +- .../coresight/coresight-etm4x-core.c | 9 +- drivers/hwtracing/coresight/coresight-priv.h | 1 + drivers/hwtracing/coresight/coresight-stm.c | 3 +- drivers/hwtracing/coresight/coresight-sysfs.c | 3 +- .../hwtracing/coresight/coresight-tmc-etr.c | 5 +- drivers/hwtracing/coresight/coresight-tmc.h | 5 +- drivers/hwtracing/coresight/coresight-tpdm.c | 3 +- .../hwtracing/coresight/coresight-trace-id.c | 138 ++-- .../hwtracing/coresight/coresight-trace-id.h | 70 +- include/linux/coresight-pmu.h | 17 +- include/linux/coresight.h | 21 +- tools/build/feature/test-libopencsd.c | 4 +- tools/include/linux/coresight-pmu.h | 17 +- tools/perf/Makefile.config | 2 +- tools/perf/arch/arm/util/cs-etm.c | 11 +- .../perf/util/cs-etm-decoder/cs-etm-decoder.c | 49 +- .../perf/util/cs-etm-decoder/cs-etm-decoder.h | 3 +- .../util/cs-etm-decoder/cs-etm-min-version.h | 13 + tools/perf/util/cs-etm.c | 625 +++++++++++------- tools/perf/util/cs-etm.h | 12 +- 25 files changed, 645 insertions(+), 476 deletions(-) create mode 100644 tools/perf/util/cs-etm-decoder/cs-etm-min-version.h -- 2.34.1

11 months, 1 week

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