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SubjectRE: [PATCH v9 07/13] x86/resctrl: Introduce data structure to support monitor configuration
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[AMD Official Use Only - General]

Hi Reinette,

> -----Original Message-----
> From: Reinette Chatre <reinette.chatre@intel.com>
> Sent: Thursday, December 15, 2022 11:19 AM
> To: Moger, Babu <Babu.Moger@amd.com>; corbet@lwn.net;
> tglx@linutronix.de; mingo@redhat.com; bp@alien8.de
> Cc: fenghua.yu@intel.com; dave.hansen@linux.intel.com; x86@kernel.org;
> hpa@zytor.com; paulmck@kernel.org; akpm@linux-foundation.org;
> quic_neeraju@quicinc.com; rdunlap@infradead.org;
> damien.lemoal@opensource.wdc.com; songmuchun@bytedance.com;
> peterz@infradead.org; jpoimboe@kernel.org; pbonzini@redhat.com;
> chang.seok.bae@intel.com; pawan.kumar.gupta@linux.intel.com;
> jmattson@google.com; daniel.sneddon@linux.intel.com; Das1, Sandipan
> <Sandipan.Das@amd.com>; tony.luck@intel.com; james.morse@arm.com;
> linux-doc@vger.kernel.org; linux-kernel@vger.kernel.org;
> bagasdotme@gmail.com; eranian@google.com; christophe.leroy@csgroup.eu;
> jarkko@kernel.org; adrian.hunter@intel.com; quic_jiles@quicinc.com;
> peternewman@google.com
> Subject: Re: [PATCH v9 07/13] x86/resctrl: Introduce data structure to support
> monitor configuration
>
> Hi Babu,
>
> I do not see a new data structure introduced. Perhaps subject could just be:
> x86/resctrl: Support monitor configuration

Sure
>
> On 12/1/2022 7:36 AM, Babu Moger wrote:
> > Add a new field in mon_evt to support Bandwidth Monitoring Event
>
> "mon_evt" -> "struct mon_evt"
Ok
>
> > Configuration(BMEC) and also update the "mon_features" display.
> >
> > The resctrl file "mon_features" will display the supported events and
> > files that can be used to configure those events if monitor
> > configuration is supported.
> >
> > Before the change.
> > $cat /sys/fs/resctrl/info/L3_MON/mon_features
> > llc_occupancy
> > mbm_total_bytes
> > mbm_local_bytes
> >
> > After the change when BMEC is supported.
> > $cat /sys/fs/resctrl/info/L3_MON/mon_features
> > llc_occupancy
> > mbm_total_bytes
> > mbm_total_bytes_config
> > mbm_local_bytes
> > mbm_local_bytes_config
> >
> > Signed-off-by: Babu Moger <babu.moger@amd.com>
> > ---
> > arch/x86/kernel/cpu/resctrl/internal.h | 2 ++
> > arch/x86/kernel/cpu/resctrl/monitor.c | 7 +++++++
> > arch/x86/kernel/cpu/resctrl/rdtgroup.c | 5 ++++-
> > 3 files changed, 13 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/x86/kernel/cpu/resctrl/internal.h
> > b/arch/x86/kernel/cpu/resctrl/internal.h
> > index 7bbfc10094b6..b36750334deb 100644
> > --- a/arch/x86/kernel/cpu/resctrl/internal.h
> > +++ b/arch/x86/kernel/cpu/resctrl/internal.h
> > @@ -52,11 +52,13 @@ DECLARE_STATIC_KEY_FALSE(rdt_mon_enable_key);
> > * struct mon_evt - Entry in the event list of a resource
> > * @evtid: event id
> > * @name: name of the event
> > + * @configurable: true if the event is configurable
> > * @list: entry in &rdt_resource->evt_list
> > */
> > struct mon_evt {
> > enum resctrl_event_id evtid;
> > char *name;
> > + bool configurable;
> > struct list_head list;
> > };
> >
> > diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c
> > b/arch/x86/kernel/cpu/resctrl/monitor.c
> > index e33e8d8bd796..b39e0eca1879 100644
> > --- a/arch/x86/kernel/cpu/resctrl/monitor.c
> > +++ b/arch/x86/kernel/cpu/resctrl/monitor.c
> > @@ -783,6 +783,13 @@ int __init rdt_get_mon_l3_config(struct
> rdt_resource *r)
> > if (ret)
> > return ret;
> >
> > + if (rdt_cpu_has(X86_FEATURE_BMEC)) {
> > + if (rdt_cpu_has(X86_FEATURE_CQM_MBM_TOTAL))
> > + mbm_total_event.configurable = true;
> > + if (rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL))
> > + mbm_local_event.configurable = true;
> > + }
> > +
> > l3_mon_evt_init(r);
> >
> > r->mon_capable = true;
> > diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> > b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> > index 8a3dafc0dbf7..8342feb54a7f 100644
> > --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> > +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> > @@ -1001,8 +1001,11 @@ static int rdt_mon_features_show(struct
> kernfs_open_file *of,
> > struct rdt_resource *r = of->kn->parent->priv;
> > struct mon_evt *mevt;
> >
> > - list_for_each_entry(mevt, &r->evt_list, list)
> > + list_for_each_entry(mevt, &r->evt_list, list) {
> > seq_printf(seq, "%s\n", mevt->name);
> > + if (mevt->configurable)
> > + seq_printf(seq, "%s_config\n", mevt->name);
> > + }
> >
> > return 0;
> > }
> >
> >
>
> With subject and changelog changes:
>
> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>

Thanks
Babu
>
> Reinette
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