Re: [kvm-unit-tests PATCH v3 2/3] arm: pmu: Reset the pmu registers before starting some tests

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On Thu, Aug 11, 2022 at 09:04:05AM +0200, Andrew Jones wrote:
> On Wed, Aug 10, 2022 at 04:33:26PM -0700, Ricardo Koller wrote:
> > On Wed, Aug 10, 2022 at 09:02:16PM +0200, Andrew Jones wrote:
> > > On Thu, Aug 04, 2022 at 05:41:38PM -0700, Ricardo Koller wrote:
> > > > Some registers like the PMOVS reset to an architecturally UNKNOWN value.
> > > > Most tests expect them to be reset (mostly zeroed) using pmu_reset().
> > > > Add a pmu_reset() on all the tests that need one.
> > > > 
> > > > As a bonus, fix a couple of comments related to the register state
> > > > before a sub-test.
> > > > 
> > > > Reviewed-by: Eric Auger <eric.auger@xxxxxxxxxx>
> > > > Signed-off-by: Ricardo Koller <ricarkol@xxxxxxxxxx>
> > > > ---
> > > >  arm/pmu.c | 6 ++++--
> > > >  1 file changed, 4 insertions(+), 2 deletions(-)
> > > > 
> > > > diff --git a/arm/pmu.c b/arm/pmu.c
> > > > index 4c601b05..12e7d84e 100644
> > > > --- a/arm/pmu.c
> > > > +++ b/arm/pmu.c
> > > > @@ -826,7 +826,7 @@ static void test_overflow_interrupt(void)
> > > >  	write_regn_el0(pmevcntr, 1, PRE_OVERFLOW);
> > > >  	isb();
> > > >  
> > > > -	/* interrupts are disabled */
> > > > +	/* interrupts are disabled (PMINTENSET_EL1 == 0) */
> > > >  
> > > >  	mem_access_loop(addr, 200, pmu.pmcr_ro | PMU_PMCR_E);
> > > >  	report(expect_interrupts(0), "no overflow interrupt after preset");
> > > > @@ -842,7 +842,7 @@ static void test_overflow_interrupt(void)
> > > >  	isb();
> > > >  	report(expect_interrupts(0), "no overflow interrupt after counting");
> > > >  
> > > > -	/* enable interrupts */
> > > > +	/* enable interrupts (PMINTENSET_EL1 <= ALL_SET) */
> > > >  
> > > >  	pmu_reset_stats();
> > > >  
> > > > @@ -890,6 +890,7 @@ static bool check_cycles_increase(void)
> > > >  	bool success = true;
> > > >  
> > > >  	/* init before event access, this test only cares about cycle count */
> > > > +	pmu_reset();
> > > 
> > > This and the other pmu_reset() call below break compilation on 32-bit arm,
> > > because there's no pmu_reset() defined for it.
> > I completely missed the 32-bit arm case. Thanks!
> > 
> > > It'd probably be best if
> > > we actually implemented some sort of reset for arm, considering it's being
> > > called in common tests.
> > 
> > Mind if I start by creating a pmu_reset() for 32-bit arm, which can
> > later be used by a general arm_reset()?
> 
> No need to worry about a general one. We just need a pmu_reset implemented
> for 32-bit arm up in its #ifdef __arm__ section.

Ahh, OK, for some reason I thought you meant a general one. Anyway,
sending v4.

Thanks,
Ricardo

> 
> Thanks,
> drew
> 
> > 
> > > 
> > > Thanks,
> > > drew
> > > 
> > > >  	set_pmcntenset(1 << PMU_CYCLE_IDX);
> > > >  	set_pmccfiltr(0); /* count cycles in EL0, EL1, but not EL2 */
> > > >  
> > > > @@ -944,6 +945,7 @@ static bool check_cpi(int cpi)
> > > >  	uint32_t pmcr = get_pmcr() | PMU_PMCR_LC | PMU_PMCR_C | PMU_PMCR_E;
> > > >  
> > > >  	/* init before event access, this test only cares about cycle count */
> > > > +	pmu_reset();
> > > >  	set_pmcntenset(1 << PMU_CYCLE_IDX);
> > > >  	set_pmccfiltr(0); /* count cycles in EL0, EL1, but not EL2 */
> > > >  
> > > > -- 
> > > > 2.37.1.559.g78731f0fdb-goog
> > > > 
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