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Re: [PATCH v4 10/11] perf env: Set flag for kernel is 64-bit mode

by Arnaldo Carvalho de Melo

Em Tue, Jul 13, 2021 at 05:31:03PM +0000, Hunter, Adrian escreveu: > > On Mon, Jul 12, 2021 at 03:14:35PM -0300, Arnaldo Carvalho de Melo wrote: > > > Em Sun, Jul 11, 2021 at 06:41:04PM +0800, Leo Yan escreveu: > > > > +++ b/tools/perf/util/env.c > > > > @@ -11,6 +11,7 @@ > > > > #include <stdlib.h> > > > > #include <string.h> > > > > +int kernel_is_64_bit; > > > > struct perf_env perf_env; > > > Why can't this be in 'struct perf_env'? > > Good question. I considered to add it in struct perf_env but finally I used this > > way; the reason is this variable "kernel_is_64_bit" is only used during > > recording phase for AUX ring buffer, and don't use it for report. So seems to > > me it's over complexity to add a new field and just wander if it's necessary to > > save this field as new feature in the perf header. > I think we store the arch, so if the "kernel_is_64_bit" calculation depends only on arch > then I guess we don't need a new feature at the moment. So, I wasn't suggesting to add this info to the perf.data file header, just to the in-memory 'struct perf_env'. And also we should avoid unconditionally initializing things that we may never need, please structure it as: static void perf_env__init_kernel_mode(struct perf_env *env) { const char *arch = perf_env__raw_arch(env); if (!strncmp(arch, "x86_64", 6) || !strncmp(arch, "aarch64", 7) || !strncmp(arch, "arm64", 5) || !strncmp(arch, "mips64", 6) || !strncmp(arch, "parisc64", 8) || !strncmp(arch, "riscv64", 7) || !strncmp(arch, "s390x", 5) || !strncmp(arch, "sparc64", 7)) kernel_is_64_bit = 1; else kernel_is_64_bit = 0; } void perf_env__init(struct perf_env *env) { ... env->kernel_is_64_bit = -1; ... } bool perf_env__kernel_is_64_bit(struct perf_env *env) { if (env->kernel_is_64_bit == -1) perf_env__init_kernel_mode(env); return env->kernel_is_64_bit; } One thing in my TODO is to crack down on the tons of initializations perf does unconditionally, last time I looked there are lots :-\ - Arnaldo > > Combining the comment from Adrian in another email, I think it's good to add > > a new field "compat_mode" in the struct perf_env, and this field will be > > initialized in build-record.c. Currently we don't need to save this value into > > the perf file, if later we need to use this value for decoding phase, then we > > can add a new feature item to save "compat_mode" > > into the perf file's header. > > If you have any different idea, please let me know. Thanks!

4 years, 7 months

[PATCH v2 0/6] perf cs-etm: Support TRBE (unformatted decoding)

by James Clark

This patchset consists of refactoring to allow the decoder to be created in advance when the AUX records are iterated over. The AUX record flags are used to communicate whether the data is formatted or not which is the reason this refactoring is required. These changes result in some simplifications, removal of early exit conditions etc. A change was also made to --dump-raw-trace code to allow the formatted/unformatted status to persist and for the decoder to not be continually deleted and recreated. The changes apply on top of the previous patchset "[PATCH v7 0/2] perf cs-etm: Split Coresight decode by aux records". Changes since v1: * Change 'decoders_per_cpu' variable name to 'decoders' and add a comment * Add a warning that piped mode is best effort, suggested by Suzuki James Clark (6): perf cs-etm: Refactor initialisation of kernel start address perf cs-etm: Split setup and timestamp search functions perf cs-etm: Only setup queues when they are modified perf cs-etm: Suppress printing when resetting decoder perf cs-etm: Use existing decoder instead of resetting it perf cs-etm: Pass unformatted flag to decoder .../perf/util/cs-etm-decoder/cs-etm-decoder.c | 14 +- tools/perf/util/cs-etm.c | 185 +++++++++--------- 2 files changed, 97 insertions(+), 102 deletions(-) -- 2.28.0

4 years, 7 months

Patch Release of OpenCSD v1.1.1

by Mike Leach

Patch release for OpenCSD v.1.1.1 made to address C-API include file issues for the ETE decoder, raised by work on perf tools Regards Mike -- Mike Leach Principal Engineer, ARM Ltd. Manchester Design Centre. UK

4 years, 7 months

[PATCH] perf build: Fix static linking with libopencsd.

by Branislav Rankov

Add -lstdc++ to perf when linking libopencsd as it is a dependency. It does not hurt to add it when dynamic linking. Filter out -static flag when building plugins as they are always built as dynamic libraries and -static and -dynamic don't work well together on arm and arm64. Signed-off-by: Tamas Zsoldos <tamas.zsoldos(a)arm.com> Signed-off-by: Branislav Rankov <branislav.rankov(a)arm.com> --- tools/perf/Makefile.config | 2 +- tools/perf/Makefile.perf | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config index 73df23dd664c..b014a9bdd0db 100644 --- a/tools/perf/Makefile.config +++ b/tools/perf/Makefile.config @@ -143,7 +143,7 @@ FEATURE_CHECK_LDFLAGS-libcrypto = -lcrypto ifdef CSINCLUDES LIBOPENCSD_CFLAGS := -I$(CSINCLUDES) endif -OPENCSDLIBS := -lopencsd_c_api -lopencsd +OPENCSDLIBS := -lopencsd_c_api -lopencsd -lstdc++ ifdef CSLIBS LIBOPENCSD_LDFLAGS := -L$(CSLIBS) endif diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf index e47f04e5b51e..cd3cf910fa8a 100644 --- a/tools/perf/Makefile.perf +++ b/tools/perf/Makefile.perf @@ -792,7 +792,7 @@ endif $(patsubst perf-%,%.o,$(PROGRAMS)): $(wildcard */*.h) -LIBTRACEEVENT_FLAGS += plugin_dir=$(plugindir_SQ) 'EXTRA_CFLAGS=$(EXTRA_CFLAGS)' 'LDFLAGS=$(LDFLAGS)' +LIBTRACEEVENT_FLAGS += plugin_dir=$(plugindir_SQ) 'EXTRA_CFLAGS=$(EXTRA_CFLAGS)' 'LDFLAGS=$(filter-out -static,$(LDFLAGS))' $(LIBTRACEEVENT): FORCE $(Q)$(MAKE) -C $(TRACE_EVENT_DIR) $(LIBTRACEEVENT_FLAGS) O=$(OUTPUT) $(OUTPUT)libtraceevent.a -- 2.17.1

4 years, 7 months

[PATCH 0/6] perf cs-etm: Support TRBE (unformatted decoding)

by James Clark

This patchset consists of refactoring to allow the decoder to be created in advance when the AUX records are iterated over. The AUX record flags are used to communicate whether the data is formatted or not which is the reason this refactoring is required. These changes result in some simplifications, removal of early exit conditions etc. A change was also made to --dump-raw-trace code to allow the formatted/unformatted status to persist and for the decoder to not be continually deleted and recreated. The changes apply on top of the previous patchset "[PATCH v7 0/2] perf cs-etm: Split Coresight decode by aux records". James Clark (6): perf cs-etm: Refactor initialisation of kernel start address perf cs-etm: Split setup and timestamp search functions perf cs-etm: Only setup queues when they are modified perf cs-etm: Suppress printing when resetting decoder perf cs-etm: Use existing decoder instead of resetting it perf cs-etm: Pass unformatted flag to decoder .../perf/util/cs-etm-decoder/cs-etm-decoder.c | 10 +- tools/perf/util/cs-etm.c | 174 ++++++++---------- 2 files changed, 84 insertions(+), 100 deletions(-) -- 2.28.0

4 years, 7 months

[PATCH v7 0/2] perf cs-etm: Split Coresight decode by aux records

by James Clark

Change applies to perf/core (45237f9898fc) Changes since v6: * Fix for snapshot mode where buffers are wrapped. This fix was done by clamping the aux record size to the size of the buffer (see comment). * Added an extra debugging printout. * Typo/formatting fixes. * Add the change for --dump-raw-trace as a second commit. I planned to do this later, but have now finished it so I'll submit it at the same time. * Did some more thorough testing around the different snapshot scenarios. Decoding snapshot files with duplicate data is improved by this patchset because of the reason mentioned at the end of the testing section. Coincidentally, the same issue is also fixed in "[PATCH v1 0/3] coresight: Fix for snapshot mode" but by not saving duplicates, rather than not decoding them. James Clark (2): perf cs-etm: Split Coresight decode by aux records perf cs-etm: Split --dump-raw-trace by AUX records tools/perf/util/cs-etm.c | 188 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 185 insertions(+), 3 deletions(-) -- 2.28.0

4 years, 7 months

[PATCH 0/5] coresight: TRBE and Self-Hosted trace fixes

by Suzuki K Poulose

This is a series of fixes addressing the issues in the way we handle - Self-Hosted trace filter control register for ETM/ETE - AUX buffer and event handling of TRBE at overflow. The use of TRUNCATED flag on an IRQ for the TRBE driver is something that needs to be rexamined. Please see Patch 3 for more details. Suzuki K Poulose (5): coresight: etm4x: Save restore TRFCR_EL1 coresight: etm4x: Use Trace Filtering controls dynamically coresight: trbe: Keep TRBE disabled on overflow irq coresight: trbe: Move irq_work queue processing coresight: trbe: Prohibit tracing while handling an IRQ .../coresight/coresight-etm4x-core.c | 109 ++++++++++++++---- drivers/hwtracing/coresight/coresight-etm4x.h | 7 +- drivers/hwtracing/coresight/coresight-trbe.c | 91 ++++++++++----- 3 files changed, 149 insertions(+), 58 deletions(-) -- 2.24.1

4 years, 7 months

[PATCH 1/3] build: Include ETE headers in install

by Mike Leach

From: James Clark <james.clark(a)arm.com> To be able to instantiate the OCSD_BUILTIN_DCD_ETE decoder the header trc_pkt_types_ete.h is required, so install it alongside the headers for the other versions. Signed-off-by: James Clark <james.clark(a)arm.com> --- decoder/build/linux/rctdl_c_api_lib/makefile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/decoder/build/linux/rctdl_c_api_lib/makefile b/decoder/build/linux/rctdl_c_api_lib/makefile index a0bd5a3..7b4055d 100644 --- a/decoder/build/linux/rctdl_c_api_lib/makefile +++ b/decoder/build/linux/rctdl_c_api_lib/makefile @@ -113,6 +113,8 @@ install_inc: $(INSTALL) --mode=0644 $(INST_INC_SRC)/etmv3/trc_pkt_types_etmv3.h $(INST_INC_DST)/etmv3/ $(INSTALL) -d --mode=0755 $(INST_INC_DST)/etmv4 $(INSTALL) --mode=0644 $(INST_INC_SRC)/etmv4/trc_pkt_types_etmv4.h $(INST_INC_DST)/etmv4/ + $(INSTALL) -d --mode=0755 $(INST_INC_DST)/ete + $(INSTALL) --mode=0644 $(INST_INC_SRC)/ete/trc_pkt_types_ete.h $(INST_INC_DST)/ete/ $(INSTALL) -d --mode=0755 $(INST_INC_DST)/c_api $(INSTALL) --mode=0644 $(INST_INC_SRC)/c_api/ocsd_c_api_types.h $(INST_INC_DST)/c_api/ $(INSTALL) --mode=0644 $(INST_INC_SRC)/c_api/opencsd_c_api.h $(INST_INC_DST)/c_api/ -- 2.17.1

4 years, 7 months

Re: [PATCH] build: Include ETE headers in install

by Mike Leach

HI James, Agreed the header is missing from the install. Looking in more detail the header should also be part of ocsd_c_api_types.h so that it gets pulled in by any program including the main api header. I'll look at an update to fix both these issues. Normally these should come through the CS mailing list, or as an issue on the git hub project. Thanks Mike On Fri, 16 Jul 2021 at 14:56, James Clark <james.clark(a)arm.com> wrote: > > To be able to instantiate the OCSD_BUILTIN_DCD_ETE decoder the header > trc_pkt_types_ete.h is required, so install it alongside the headers for > the other versions. > > Signed-off-by: James Clark <james.clark(a)arm.com> > --- > decoder/build/linux/rctdl_c_api_lib/makefile | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/decoder/build/linux/rctdl_c_api_lib/makefile b/decoder/build/linux/rctdl_c_api_lib/makefile > index a0bd5a3..7b4055d 100644 > --- a/decoder/build/linux/rctdl_c_api_lib/makefile > +++ b/decoder/build/linux/rctdl_c_api_lib/makefile > @@ -113,6 +113,8 @@ install_inc: > $(INSTALL) --mode=0644 $(INST_INC_SRC)/etmv3/trc_pkt_types_etmv3.h $(INST_INC_DST)/etmv3/ > $(INSTALL) -d --mode=0755 $(INST_INC_DST)/etmv4 > $(INSTALL) --mode=0644 $(INST_INC_SRC)/etmv4/trc_pkt_types_etmv4.h $(INST_INC_DST)/etmv4/ > + $(INSTALL) -d --mode=0755 $(INST_INC_DST)/ete > + $(INSTALL) --mode=0644 $(INST_INC_SRC)/ete/trc_pkt_types_ete.h $(INST_INC_DST)/ete/ > $(INSTALL) -d --mode=0755 $(INST_INC_DST)/c_api > $(INSTALL) --mode=0644 $(INST_INC_SRC)/c_api/ocsd_c_api_types.h $(INST_INC_DST)/c_api/ > $(INSTALL) --mode=0644 $(INST_INC_SRC)/c_api/opencsd_c_api.h $(INST_INC_DST)/c_api/ > -- > 2.28.0 > -- Mike Leach Principal Engineer, ARM Ltd. Manchester Design Centre. UK

4 years, 7 months

Re: [PATCH 5/5] coresight: trbe: Prohibit tracing while handling an IRQ

by Suzuki K Poulose

On 15/07/2021 04:09, Anshuman Khandual wrote: > A small nit. Paragraphs in the commit message do not seem to be aligned > properly to a maximum 75 characters width. > > On 7/12/21 5:08 PM, Suzuki K Poulose wrote: >> When the TRBE generates an IRQ, we stop the TRBE, collect the trace >> and then reprogram the TRBE with the updated buffer pointers in case >> of a spurious IRQ. We might also leave the TRBE disabled, on an >> overflow interrupt, without touching the ETE. This means the >> the ETE is only disabled when the event is disabled later (via irq_work). >> This is incorrect, as the ETE trace is still ON without actually being >> captured and may be routed to the ATB. > > I had an assumption that when the TRBE is stopped, ETE would also stop > implicitly given that the trace packets are not being accepted anymore. > But if that assumption does not always hold true, then yes trace must > be stopped upon a TRBE IRQ. No, the ETE never stops, until it is stopped. The ETE doesn't care who is the consumer of the trace. Be it TRBE or ATB or any other sink. > >> >> So, we move the CPU into trace prohibited state (for all exception >> levels) upon entering the IRQ handler. The state is restored before >> enabling the TRBE back. Otherwise the trace remains prohibited. >> Since, the ETM/ETE driver controls the TRFCR_EL1 per session, >> (from commit "coresight: etm4x: Use Trace Filtering controls dynamically") > > commit SHA ID ? > The patch is in this series, not committed yet. >> the tracing can be restored/enabled back when the event is rescheduled >> in. > > Makes sense. > >> >> Fixes: 3fbf7f011f24 ("coresight: sink: Add TRBE driver") >> Cc: Anshuman Khandual <anshuman.khandual(a)arm.com> >> Cc: Mathieu Poirier <mathieu.poirier(a)linaro.org> >> Cc: Mike Leach <mike.leach(a)linaro.org> >> Cc: Leo Yan <leo.yan(a)linaro.org> >> Signed-off-by: Suzuki K Poulose <suzuki.poulose(a)arm.com> >> --- >> drivers/hwtracing/coresight/coresight-trbe.c | 43 ++++++++++++++++++-- >> 1 file changed, 40 insertions(+), 3 deletions(-) >> >> diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c >> index c0c264264427..e4d88e0de2a8 100644 >> --- a/drivers/hwtracing/coresight/coresight-trbe.c >> +++ b/drivers/hwtracing/coresight/coresight-trbe.c >> @@ -83,6 +83,31 @@ struct trbe_drvdata { >> struct platform_device *pdev; >> }; >> >> +static inline void write_trfcr(u64 val) >> +{ >> + write_sysreg_s(val, SYS_TRFCR_EL1); >> + isb(); >> +} >> + > > There is another instance of write_trfcr() in coresight-etm4x-core.c and > some other writes into SYS_TRFCR_EL1 elsewhere. write_trfcr() should be > factored out and moved to a common place. Agreed, but I couldn't find a right candidate for this. Welcome to suggestions. May be we could add something like: asm/self-hosted.h > >> +/* >> + * Prohibit the CPU tracing at all ELs, in preparation to collect >> + * the trace buffer. >> + * >> + * Returns the original value of the trfcr for restoring later. >> + */ >> +static u64 cpu_prohibit_tracing(void) >> +{ >> + u64 trfcr = read_sysreg_s(SYS_TRFCR_EL1); >> + >> + write_trfcr(trfcr & ~(TRFCR_ELx_ExTRE | TRFCR_ELx_E0TRE)); >> + return trfcr; >> +} > > This also should be factored out along with etm4x_prohibit_trace() > usage and moved to a common header instead. > >> + >> +static void cpu_restore_tracing(u64 trfcr) >> +{ >> + write_trfcr(trfcr); >> +} >> + >> static int trbe_alloc_node(struct perf_event *event) >> { >> if (event->cpu == -1) >> @@ -681,7 +706,7 @@ static int arm_trbe_disable(struct coresight_device *csdev) >> return 0; >> } >> >> -static void trbe_handle_spurious(struct perf_output_handle *handle) >> +static void trbe_handle_spurious(struct perf_output_handle *handle, u64 trfcr) >> { >> struct trbe_buf *buf = etm_perf_sink_config(handle); >> >> @@ -691,6 +716,7 @@ static void trbe_handle_spurious(struct perf_output_handle *handle) >> trbe_drain_and_disable_local(); >> return; >> } > > A small comment here would be great because this will be the only > IRQ handler path, where it actually restores the tracing back. Agreed > >> + cpu_restore_tracing(trfcr); >> trbe_enable_hw(buf); >> } >> >> @@ -760,7 +786,18 @@ static irqreturn_t arm_trbe_irq_handler(int irq, void *dev) >> struct perf_output_handle **handle_ptr = dev; >> struct perf_output_handle *handle = *handle_ptr; >> enum trbe_fault_action act; >> - u64 status; >> + u64 status, trfcr; >> + >> + /* >> + * Prohibit the tracing, while we process this. We turn >> + * things back right, if we get to enabling the TRBE >> + * back again. Otherwise, the tracing still remains >> + * prohibited, until the perf event state changes >> + * or another event is scheduled. This ensures that >> + * the trace is not generated when it cannot be >> + * captured. >> + */ > > Right. > > But a small nit though. Please keep the comments here formatted and > aligned with the existing ones. > ok >> + trfcr = cpu_prohibit_tracing(); >> >> /* >> * Ensure the trace is visible to the CPUs and >> @@ -791,7 +828,7 @@ static irqreturn_t arm_trbe_irq_handler(int irq, void *dev) >> trbe_handle_overflow(handle); >> break; >> case TRBE_FAULT_ACT_SPURIOUS: >> - trbe_handle_spurious(handle); >> + trbe_handle_spurious(handle, trfcr); >> break; >> case TRBE_FAULT_ACT_FATAL: >> trbe_stop_and_truncate_event(handle); >> > > But stopping the trace (even though from a sink IRQ handler) is a source > device action. Should not this be done via a new coresight_ops_source > callback instead ? It is a valid point. But that has limitations. Here is the list: * Stopping the source is a heavy hammer, especially if we are about to continue the trace soon. (e.g, spurious interrupt and possibly soon for FILL events with reworking the flags) * Stopping the source, via source_ops() is doing things under the driving mode of the session, perf vs sysfs. We only support perf though, but if there is another user. * This is agnostic to the mode (as above), the TRBE driver doesn't need to be taught, how to find the path and stop the current session for the given mode. * If the tracing is enabled in kernel mode, the ETE still generates the trace until we trigger the longer route for disabling, which is not nice. Suzuki

4 years, 7 months

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