| Message ID | 20231205024310.1593100-3-atishp@rivosinc.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | RISC-V SBI v2.0 PMU improvements and Perf sampling in KVM guest | expand |
On Mon, Dec 04, 2023 at 06:43:03PM -0800, Atish Patra wrote: > SBI v2.0 added few functions to improve SBI PMU extension. In order > to be backward compatible, the driver must use these functions only > if SBI v2.0 is available. > > Signed-off-by: Atish Patra <atishp@rivosinc.com> IMO this does not make sense in a patch of its own and should probably be squashed with the first user for it. > --- > drivers/perf/riscv_pmu_sbi.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c > index 16acd4dcdb96..40a335350d08 100644 > --- a/drivers/perf/riscv_pmu_sbi.c > +++ b/drivers/perf/riscv_pmu_sbi.c > @@ -35,6 +35,8 @@ > PMU_FORMAT_ATTR(event, "config:0-47"); > PMU_FORMAT_ATTR(firmware, "config:63"); > > +static bool sbi_v2_available; > + > static struct attribute *riscv_arch_formats_attr[] = { > &format_attr_event.attr, > &format_attr_firmware.attr, > @@ -1108,6 +1110,9 @@ static int __init pmu_sbi_devinit(void) > return 0; > } > > + if (sbi_spec_version >= sbi_mk_version(2, 0)) > + sbi_v2_available = true; > + > ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_RISCV_STARTING, > "perf/riscv/pmu:starting", > pmu_sbi_starting_cpu, pmu_sbi_dying_cpu); > -- > 2.34.1 >
On Thu, Dec 7, 2023 at 5:39 PM Conor Dooley <conor.dooley@microchip.com> wrote: > > On Mon, Dec 04, 2023 at 06:43:03PM -0800, Atish Patra wrote: > > SBI v2.0 added few functions to improve SBI PMU extension. In order > > to be backward compatible, the driver must use these functions only > > if SBI v2.0 is available. > > > > Signed-off-by: Atish Patra <atishp@rivosinc.com> > > IMO this does not make sense in a patch of its own and should probably > be squashed with the first user for it. I agree. This patch should be squashed into patch4 where the flag is first used. Regards, Anup > > > --- > > drivers/perf/riscv_pmu_sbi.c | 5 +++++ > > 1 file changed, 5 insertions(+) > > > > diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c > > index 16acd4dcdb96..40a335350d08 100644 > > --- a/drivers/perf/riscv_pmu_sbi.c > > +++ b/drivers/perf/riscv_pmu_sbi.c > > @@ -35,6 +35,8 @@ > > PMU_FORMAT_ATTR(event, "config:0-47"); > > PMU_FORMAT_ATTR(firmware, "config:63"); > > > > +static bool sbi_v2_available; > > + > > static struct attribute *riscv_arch_formats_attr[] = { > > &format_attr_event.attr, > > &format_attr_firmware.attr, > > @@ -1108,6 +1110,9 @@ static int __init pmu_sbi_devinit(void) > > return 0; > > } > > > > + if (sbi_spec_version >= sbi_mk_version(2, 0)) > > + sbi_v2_available = true; > > + > > ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_RISCV_STARTING, > > "perf/riscv/pmu:starting", > > pmu_sbi_starting_cpu, pmu_sbi_dying_cpu); > > -- > > 2.34.1 > >
On Thu, Dec 14, 2023 at 4:16 AM Anup Patel <anup@brainfault.org> wrote: > > On Thu, Dec 7, 2023 at 5:39 PM Conor Dooley <conor.dooley@microchip.com> wrote: > > > > On Mon, Dec 04, 2023 at 06:43:03PM -0800, Atish Patra wrote: > > > SBI v2.0 added few functions to improve SBI PMU extension. In order > > > to be backward compatible, the driver must use these functions only > > > if SBI v2.0 is available. > > > > > > Signed-off-by: Atish Patra <atishp@rivosinc.com> > > > > IMO this does not make sense in a patch of its own and should probably > > be squashed with the first user for it. > > I agree. This patch should be squashed into patch4 where the > flag is first used. > Done. Thanks. > Regards, > Anup > > > > > > --- > > > drivers/perf/riscv_pmu_sbi.c | 5 +++++ > > > 1 file changed, 5 insertions(+) > > > > > > diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c > > > index 16acd4dcdb96..40a335350d08 100644 > > > --- a/drivers/perf/riscv_pmu_sbi.c > > > +++ b/drivers/perf/riscv_pmu_sbi.c > > > @@ -35,6 +35,8 @@ > > > PMU_FORMAT_ATTR(event, "config:0-47"); > > > PMU_FORMAT_ATTR(firmware, "config:63"); > > > > > > +static bool sbi_v2_available; > > > + > > > static struct attribute *riscv_arch_formats_attr[] = { > > > &format_attr_event.attr, > > > &format_attr_firmware.attr, > > > @@ -1108,6 +1110,9 @@ static int __init pmu_sbi_devinit(void) > > > return 0; > > > } > > > > > > + if (sbi_spec_version >= sbi_mk_version(2, 0)) > > > + sbi_v2_available = true; > > > + > > > ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_RISCV_STARTING, > > > "perf/riscv/pmu:starting", > > > pmu_sbi_starting_cpu, pmu_sbi_dying_cpu); > > > -- > > > 2.34.1 > > >
diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c index 16acd4dcdb96..40a335350d08 100644 --- a/drivers/perf/riscv_pmu_sbi.c +++ b/drivers/perf/riscv_pmu_sbi.c @@ -35,6 +35,8 @@ PMU_FORMAT_ATTR(event, "config:0-47"); PMU_FORMAT_ATTR(firmware, "config:63"); +static bool sbi_v2_available; + static struct attribute *riscv_arch_formats_attr[] = { &format_attr_event.attr, &format_attr_firmware.attr, @@ -1108,6 +1110,9 @@ static int __init pmu_sbi_devinit(void) return 0; } + if (sbi_spec_version >= sbi_mk_version(2, 0)) + sbi_v2_available = true; + ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_RISCV_STARTING, "perf/riscv/pmu:starting", pmu_sbi_starting_cpu, pmu_sbi_dying_cpu);
SBI v2.0 added few functions to improve SBI PMU extension. In order to be backward compatible, the driver must use these functions only if SBI v2.0 is available. Signed-off-by: Atish Patra <atishp@rivosinc.com> --- drivers/perf/riscv_pmu_sbi.c | 5 +++++ 1 file changed, 5 insertions(+)