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Date: Tue, 27 Sep 2022 22:25:07 +0000
From: "Yu, Fenghua" <fenghua.yu@...el.com>
To: Babu Moger <babu.moger@....com>, "corbet@....net" <corbet@....net>,
"Chatre, Reinette" <reinette.chatre@...el.com>,
"tglx@...utronix.de" <tglx@...utronix.de>,
"mingo@...hat.com" <mingo@...hat.com>,
"bp@...en8.de" <bp@...en8.de>
CC: "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
"x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
"paulmck@...nel.org" <paulmck@...nel.org>,
"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
"quic_neeraju@...cinc.com" <quic_neeraju@...cinc.com>,
"rdunlap@...radead.org" <rdunlap@...radead.org>,
"damien.lemoal@...nsource.wdc.com" <damien.lemoal@...nsource.wdc.com>,
"songmuchun@...edance.com" <songmuchun@...edance.com>,
"peterz@...radead.org" <peterz@...radead.org>,
"jpoimboe@...nel.org" <jpoimboe@...nel.org>,
"pbonzini@...hat.com" <pbonzini@...hat.com>,
"Bae, Chang Seok" <chang.seok.bae@...el.com>,
"pawan.kumar.gupta@...ux.intel.com"
<pawan.kumar.gupta@...ux.intel.com>,
"jmattson@...gle.com" <jmattson@...gle.com>,
"daniel.sneddon@...ux.intel.com" <daniel.sneddon@...ux.intel.com>,
"sandipan.das@....com" <sandipan.das@....com>,
"Luck, Tony" <tony.luck@...el.com>,
"james.morse@....com" <james.morse@....com>,
"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"bagasdotme@...il.com" <bagasdotme@...il.com>,
"Eranian, Stephane" <eranian@...gle.com>
Subject: RE: [PATCH v5 06/12] x86/resctrl: Introduce data structure to support
monitor configuration
Hi, Babu,
> Add couple of fields in mon_evt to support Bandwidth Monitoring Event
> Configuratio (BMEC) and also update the "mon_features".
s/Configuratio/ Configuration/
>
> The sysfs file "mon_features" will display the monitor configuration if supported.
>
> Before the change.
> $cat /sys/fs/resctrl/info/L3_MON/mon_features
> llc_occupancy
> mbm_total_bytes
> mbm_local_bytes
>
> After the change if BMEC is supported.
> $cat /sys/fs/resctrl/info/L3_MON/mon_features
> llc_occupancy
> mbm_total_bytes
> mbm_total_config
> mbm_local_bytes
> mbm_local_config
>
> Signed-off-by: Babu Moger <babu.moger@....com>
> ---
> arch/x86/kernel/cpu/resctrl/core.c | 3 ++-
> arch/x86/kernel/cpu/resctrl/internal.h | 6 +++++-
> arch/x86/kernel/cpu/resctrl/monitor.c | 9 ++++++++-
> arch/x86/kernel/cpu/resctrl/rdtgroup.c | 5 ++++-
> 4 files changed, 19 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/resctrl/core.c
> b/arch/x86/kernel/cpu/resctrl/core.c
> index 56c96607259c..513e6a00f58e 100644
> --- a/arch/x86/kernel/cpu/resctrl/core.c
> +++ b/arch/x86/kernel/cpu/resctrl/core.c
> @@ -849,6 +849,7 @@ static __init bool get_rdt_alloc_resources(void) static
> __init bool get_rdt_mon_resources(void) {
> struct rdt_resource *r =
> &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
> + bool mon_configurable = rdt_cpu_has(X86_FEATURE_BMEC);
>
> if (rdt_cpu_has(X86_FEATURE_CQM_OCCUP_LLC))
> rdt_mon_features |= (1 << QOS_L3_OCCUP_EVENT_ID); @@ -
> 860,7 +861,7 @@ static __init bool get_rdt_mon_resources(void)
> if (!rdt_mon_features)
> return false;
>
> - return !rdt_get_mon_l3_config(r);
> + return !rdt_get_mon_l3_config(r, mon_configurable);
> }
>
> static __init void __check_quirks_intel(void) diff --git
> a/arch/x86/kernel/cpu/resctrl/internal.h
> b/arch/x86/kernel/cpu/resctrl/internal.h
> index c049a274383c..4d03f443b353 100644
> --- a/arch/x86/kernel/cpu/resctrl/internal.h
> +++ b/arch/x86/kernel/cpu/resctrl/internal.h
> @@ -72,11 +72,15 @@ 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
> + * @config_name: sysfs file name of the event if configurable
> * @list: entry in &rdt_resource->evt_list
> */
> struct mon_evt {
> u32 evtid;
> char *name;
> + bool configurable;
> + char *config_name;
Seems config_name is only used to be shown in mon_features. Is it necessary to have the field?
> struct list_head list;
> };
>
> @@ -529,7 +533,7 @@ int closids_supported(void); void closid_free(int closid);
> int alloc_rmid(void); void free_rmid(u32 rmid); -int
> rdt_get_mon_l3_config(struct rdt_resource *r);
> +int rdt_get_mon_l3_config(struct rdt_resource *r, bool configurable);
> void mon_event_count(void *info);
> int rdtgroup_mondata_show(struct seq_file *m, void *arg); void
> rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r, diff --git
> a/arch/x86/kernel/cpu/resctrl/monitor.c
> b/arch/x86/kernel/cpu/resctrl/monitor.c
> index eaf25a234ff5..dc97aa7a3b3d 100644
> --- a/arch/x86/kernel/cpu/resctrl/monitor.c
> +++ b/arch/x86/kernel/cpu/resctrl/monitor.c
> @@ -656,11 +656,13 @@ static struct mon_evt llc_occupancy_event = { static
> struct mon_evt mbm_total_event = {
> .name = "mbm_total_bytes",
> .evtid = QOS_L3_MBM_TOTAL_EVENT_ID,
> + .config_name = "mbm_total_config",
> };
Struct mon_evt mbm_total_config_event = {
.name = "mbm_total_config",
>
> static struct mon_evt mbm_local_event = {
> .name = "mbm_local_bytes",
> .evtid = QOS_L3_MBM_LOCAL_EVENT_ID,
> + .config_name = "mbm_local_config",
> };
>
> /*
> @@ -682,7 +684,7 @@ static void l3_mon_evt_init(struct rdt_resource *r)
> list_add_tail(&mbm_local_event.list, &r->evt_list); }
>
> -int rdt_get_mon_l3_config(struct rdt_resource *r)
> +int rdt_get_mon_l3_config(struct rdt_resource *r, bool configurable)
> {
> unsigned int mbm_offset =
> boot_cpu_data.x86_cache_mbm_width_offset;
> struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r); @@ -714,6
> +716,11 @@ int rdt_get_mon_l3_config(struct rdt_resource *r)
> if (ret)
> return ret;
>
> + if (configurable) {
> + mbm_total_event.configurable = true;
> + 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 04b519bca50d..834a55d78e3f 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\n", mevt->config_name);
If "config_name" is not defined, it could be:
If (mevt->configurable)
Seq_printf(seq, "%s_config\n", mevt->name);
Thanks.
-Fenghua
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