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

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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.

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
> > > 



[Index of Archives]     [KVM ARM]     [KVM ia64]     [KVM ppc]     [Virtualization Tools]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Questions]     [Linux Kernel]     [Linux SCSI]     [XFree86]

  Powered by Linux