| Message ID | 1443728841-10501-1-git-send-email-cov@codeaurora.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thu, Oct 01, 2015 at 03:47:21PM -0400, Christopher Covington wrote: > Beginning with just a read of the control register, add plumbing > for testing the ARM Performance Monitors Unit (PMU). > > Signed-off-by: Christopher Covington <cov@codeaurora.org> Hi Christopher, PMU tests are a great idea. I think Wei Huang has started working on them too. I've CC'ed him so you two can work out how to proceed without duplication of effort. For kvm-unit-tests patches please make sure the kvm-unit-tests flag is in the PATCH tag. You may want to run git config format.subjectprefix "kvm-unit-tests PATCH" in your git repo. > --- > arm/pmu.c | 31 +++++++++++++++++++++++++++++++ > arm/unittests.cfg | 5 +++++ > config/config-arm-common.mak | 4 +++- > 3 files changed, 39 insertions(+), 1 deletion(-) > create mode 100644 arm/pmu.c > > diff --git a/arm/pmu.c b/arm/pmu.c > new file mode 100644 > index 0000000..b1e3c7a > --- /dev/null > +++ b/arm/pmu.c > @@ -0,0 +1,31 @@ > +#include "libcflat.h" > + > +union pmcr_el0 { > + struct { > + unsigned int implementor:8; > + unsigned int identification_code:8; > + unsigned int num_counters:5; > + unsigned int zeros:4; > + unsigned int cycle_counter_long:1; > + unsigned int cycle_counter_disable_when_prohibited:1; > + unsigned int event_counter_export:1; > + unsigned int cycle_counter_clock_divider:1; > + unsigned int cycle_counter_reset:1; > + unsigned int event_counter_reset:1; > + unsigned int enable:1; > + } split; I'd use an anonymous struct here. And, since I prefer to avoid needing to remember a data structure is a union, I'd also make the union anonymous and wrap it inside a struct, i.e. struct pmu_data { union { uint32_t pmcr_el0; struct { ... }; }; }; > + uint32_t full; > +}; > + > +int main() > +{ > + union pmcr_el0 pmcr; > + > + asm volatile("mrs %0, pmcr_el0\n" : "=r" (pmcr)); > + > + printf("PMU implementor: 0x%x\n", pmcr.split.implementor); > + printf("Identification code: 0x%x\n", pmcr.split.identification_code); > + printf("Event counters: %d\n", pmcr.split.num_counters); > + > + return report_summary(); > +} > diff --git a/arm/unittests.cfg b/arm/unittests.cfg > index e068a0c..d3deb6a 100644 > --- a/arm/unittests.cfg > +++ b/arm/unittests.cfg > @@ -35,3 +35,8 @@ file = selftest.flat > smp = `getconf _NPROCESSORS_CONF` > extra_params = -append 'smp' > groups = selftest > + > +# Test PMU support > +[pmu] > +file = pmu.flat > +groups = pmu > diff --git a/config/config-arm-common.mak b/config/config-arm-common.mak > index 698555d..b34d04c 100644 > --- a/config/config-arm-common.mak > +++ b/config/config-arm-common.mak > @@ -11,7 +11,8 @@ endif > > tests-common = \ > $(TEST_DIR)/selftest.flat \ > - $(TEST_DIR)/spinlock-test.flat > + $(TEST_DIR)/spinlock-test.flat \ > + $(TEST_DIR)/pmu.flat > > all: test_cases > > @@ -70,3 +71,4 @@ test_cases: $(generated_files) $(tests-common) $(tests) > > $(TEST_DIR)/selftest.elf: $(cstart.o) $(TEST_DIR)/selftest.o > $(TEST_DIR)/spinlock-test.elf: $(cstart.o) $(TEST_DIR)/spinlock-test.o > +$(TEST_DIR)/pmu.elf: $(cstart.o) $(TEST_DIR)/pmu.o > -- > Qualcomm Innovation Center, Inc. > The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, > a Linux Foundation Collaborative Project > > Thanks, drew -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/arm/pmu.c b/arm/pmu.c new file mode 100644 index 0000000..b1e3c7a --- /dev/null +++ b/arm/pmu.c @@ -0,0 +1,31 @@ +#include "libcflat.h" + +union pmcr_el0 { + struct { + unsigned int implementor:8; + unsigned int identification_code:8; + unsigned int num_counters:5; + unsigned int zeros:4; + unsigned int cycle_counter_long:1; + unsigned int cycle_counter_disable_when_prohibited:1; + unsigned int event_counter_export:1; + unsigned int cycle_counter_clock_divider:1; + unsigned int cycle_counter_reset:1; + unsigned int event_counter_reset:1; + unsigned int enable:1; + } split; + uint32_t full; +}; + +int main() +{ + union pmcr_el0 pmcr; + + asm volatile("mrs %0, pmcr_el0\n" : "=r" (pmcr)); + + printf("PMU implementor: 0x%x\n", pmcr.split.implementor); + printf("Identification code: 0x%x\n", pmcr.split.identification_code); + printf("Event counters: %d\n", pmcr.split.num_counters); + + return report_summary(); +} diff --git a/arm/unittests.cfg b/arm/unittests.cfg index e068a0c..d3deb6a 100644 --- a/arm/unittests.cfg +++ b/arm/unittests.cfg @@ -35,3 +35,8 @@ file = selftest.flat smp = `getconf _NPROCESSORS_CONF` extra_params = -append 'smp' groups = selftest + +# Test PMU support +[pmu] +file = pmu.flat +groups = pmu diff --git a/config/config-arm-common.mak b/config/config-arm-common.mak index 698555d..b34d04c 100644 --- a/config/config-arm-common.mak +++ b/config/config-arm-common.mak @@ -11,7 +11,8 @@ endif tests-common = \ $(TEST_DIR)/selftest.flat \ - $(TEST_DIR)/spinlock-test.flat + $(TEST_DIR)/spinlock-test.flat \ + $(TEST_DIR)/pmu.flat all: test_cases @@ -70,3 +71,4 @@ test_cases: $(generated_files) $(tests-common) $(tests) $(TEST_DIR)/selftest.elf: $(cstart.o) $(TEST_DIR)/selftest.o $(TEST_DIR)/spinlock-test.elf: $(cstart.o) $(TEST_DIR)/spinlock-test.o +$(TEST_DIR)/pmu.elf: $(cstart.o) $(TEST_DIR)/pmu.o
Beginning with just a read of the control register, add plumbing for testing the ARM Performance Monitors Unit (PMU). Signed-off-by: Christopher Covington <cov@codeaurora.org> --- arm/pmu.c | 31 +++++++++++++++++++++++++++++++ arm/unittests.cfg | 5 +++++ config/config-arm-common.mak | 4 +++- 3 files changed, 39 insertions(+), 1 deletion(-) create mode 100644 arm/pmu.c