vpmu_counter_access's disable_counter() carries a bug that disables
all the counters that are enabled, instead of just the requested one.
Fortunately, it's not an issue as there are no callers of it. Hence,
instead of fixing it, remove the definition entirely.
Remove enable_counter() as it's unused as well.
Signed-off-by: Raghavendra Rao Ananta <[email protected]>
---
.../selftests/kvm/aarch64/vpmu_counter_access.c | 16 ----------------
1 file changed, 16 deletions(-)
diff --git a/tools/testing/selftests/kvm/aarch64/vpmu_counter_access.c b/tools/testing/selftests/kvm/aarch64/vpmu_counter_access.c
index 5ea78986e665f..e2f0b720cbfcf 100644
--- a/tools/testing/selftests/kvm/aarch64/vpmu_counter_access.c
+++ b/tools/testing/selftests/kvm/aarch64/vpmu_counter_access.c
@@ -94,22 +94,6 @@ static inline void write_sel_evtyper(int sel, unsigned long val)
isb();
}
-static inline void enable_counter(int idx)
-{
- uint64_t v = read_sysreg(pmcntenset_el0);
-
- write_sysreg(BIT(idx) | v, pmcntenset_el0);
- isb();
-}
-
-static inline void disable_counter(int idx)
-{
- uint64_t v = read_sysreg(pmcntenset_el0);
-
- write_sysreg(BIT(idx) | v, pmcntenclr_el0);
- isb();
-}
-
static void pmu_disable_reset(void)
{
uint64_t pmcr = read_sysreg(pmcr_el0);
--
2.43.0.rc1.413.gea7ed67945-goog
On 2023/11/23 6:15, Raghavendra Rao Ananta wrote:
> vpmu_counter_access's disable_counter() carries a bug that disables
> all the counters that are enabled, instead of just the requested one.
> Fortunately, it's not an issue as there are no callers of it. Hence,
> instead of fixing it, remove the definition entirely.
>
> Remove enable_counter() as it's unused as well.
>
> Signed-off-by: Raghavendra Rao Ananta <[email protected]>
Reviewed-by: Zenghui Yu <[email protected]>
Hi Raghavendra,
Those functions might be useful for other pmu tests. Recently I just
wrote a pmu_event_filter_test[1] and use the enable_counter().
There may have more pmu tests which can use the helper functions, so I
think we can keep it now. And in my series[1], I have moved them into
the lib/ as the helper function.
[1]https://lore.kernel.org/all/[email protected]/
Thanks,
Shaoqin
On 11/23/23 06:15, Raghavendra Rao Ananta wrote:
> vpmu_counter_access's disable_counter() carries a bug that disables
> all the counters that are enabled, instead of just the requested one.
> Fortunately, it's not an issue as there are no callers of it. Hence,
> instead of fixing it, remove the definition entirely.
>
> Remove enable_counter() as it's unused as well.
>
> Signed-off-by: Raghavendra Rao Ananta <[email protected]>
> ---
> .../selftests/kvm/aarch64/vpmu_counter_access.c | 16 ----------------
> 1 file changed, 16 deletions(-)
>
> diff --git a/tools/testing/selftests/kvm/aarch64/vpmu_counter_access.c b/tools/testing/selftests/kvm/aarch64/vpmu_counter_access.c
> index 5ea78986e665f..e2f0b720cbfcf 100644
> --- a/tools/testing/selftests/kvm/aarch64/vpmu_counter_access.c
> +++ b/tools/testing/selftests/kvm/aarch64/vpmu_counter_access.c
> @@ -94,22 +94,6 @@ static inline void write_sel_evtyper(int sel, unsigned long val)
> isb();
> }
>
> -static inline void enable_counter(int idx)
> -{
> - uint64_t v = read_sysreg(pmcntenset_el0);
> -
> - write_sysreg(BIT(idx) | v, pmcntenset_el0);
> - isb();
> -}
> -
> -static inline void disable_counter(int idx)
> -{
> - uint64_t v = read_sysreg(pmcntenset_el0);
> -
> - write_sysreg(BIT(idx) | v, pmcntenclr_el0);
> - isb();
> -}
> -
> static void pmu_disable_reset(void)
> {
> uint64_t pmcr = read_sysreg(pmcr_el0);
Hi Shaoqin,
On Wed, Nov 22, 2023 at 10:43 PM Shaoqin Huang <[email protected]> wrote:
>
> Hi Raghavendra,
>
> Those functions might be useful for other pmu tests. Recently I just
> wrote a pmu_event_filter_test[1] and use the enable_counter().
>
> There may have more pmu tests which can use the helper functions, so I
> think we can keep it now. And in my series[1], I have moved them into
> the lib/ as the helper function.
>
> [1]https://lore.kernel.org/all/[email protected]/
>
Thanks for the pointer. If you are planning to use it, then we can
abandon this patch. However, disable_counter() may need fixing. I'll
comment directly on your patch.
Thank you.
Raghavendra
> Thanks,
> Shaoqin
>
> On 11/23/23 06:15, Raghavendra Rao Ananta wrote:
> > vpmu_counter_access's disable_counter() carries a bug that disables
> > all the counters that are enabled, instead of just the requested one.
> > Fortunately, it's not an issue as there are no callers of it. Hence,
> > instead of fixing it, remove the definition entirely.
> >
> > Remove enable_counter() as it's unused as well.
> >
> > Signed-off-by: Raghavendra Rao Ananta <[email protected]>
> > ---
> > .../selftests/kvm/aarch64/vpmu_counter_access.c | 16 ----------------
> > 1 file changed, 16 deletions(-)
> >
> > diff --git a/tools/testing/selftests/kvm/aarch64/vpmu_counter_access.c b/tools/testing/selftests/kvm/aarch64/vpmu_counter_access.c
> > index 5ea78986e665f..e2f0b720cbfcf 100644
> > --- a/tools/testing/selftests/kvm/aarch64/vpmu_counter_access.c
> > +++ b/tools/testing/selftests/kvm/aarch64/vpmu_counter_access.c
> > @@ -94,22 +94,6 @@ static inline void write_sel_evtyper(int sel, unsigned long val)
> > isb();
> > }
> >
> > -static inline void enable_counter(int idx)
> > -{
> > - uint64_t v = read_sysreg(pmcntenset_el0);
> > -
> > - write_sysreg(BIT(idx) | v, pmcntenset_el0);
> > - isb();
> > -}
> > -
> > -static inline void disable_counter(int idx)
> > -{
> > - uint64_t v = read_sysreg(pmcntenset_el0);
> > -
> > - write_sysreg(BIT(idx) | v, pmcntenclr_el0);
> > - isb();
> > -}
> > -
> > static void pmu_disable_reset(void)
> > {
> > uint64_t pmcr = read_sysreg(pmcr_el0);
>
On Wed, 22 Nov 2023 22:15:26 +0000, Raghavendra Rao Ananta wrote:
> vpmu_counter_access's disable_counter() carries a bug that disables
> all the counters that are enabled, instead of just the requested one.
> Fortunately, it's not an issue as there are no callers of it. Hence,
> instead of fixing it, remove the definition entirely.
>
> Remove enable_counter() as it's unused as well.
>
> [...]
Applied to kvmarm/next, thanks!
[1/1] KVM: selftests: aarch64: Remove unused functions from vpmu test
https://git.kernel.org/kvmarm/kvmarm/c/43b3bedb7cc4
--
Best,
Oliver