linux-kernel - [PATCH v8 07/13] x86/resctrl: Introduce data structure to support monitor configuration

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <166759204323.3281208.9744810874584175730.stgit@bmoger-ubuntu>
Date:   Fri, 4 Nov 2022 15:00:43 -0500
From:   Babu Moger <babu.moger@....com>
To:     <corbet@....net>, <reinette.chatre@...el.com>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>
CC:     <fenghua.yu@...el.com>, <dave.hansen@...ux.intel.com>,
        <x86@...nel.org>, <hpa@...or.com>, <paulmck@...nel.org>,
        <akpm@...ux-foundation.org>, <quic_neeraju@...cinc.com>,
        <rdunlap@...radead.org>, <damien.lemoal@...nsource.wdc.com>,
        <songmuchun@...edance.com>, <peterz@...radead.org>,
        <jpoimboe@...nel.org>, <pbonzini@...hat.com>, <babu.moger@....com>,
        <chang.seok.bae@...el.com>, <pawan.kumar.gupta@...ux.intel.com>,
        <jmattson@...gle.com>, <daniel.sneddon@...ux.intel.com>,
        <sandipan.das@....com>, <tony.luck@...el.com>,
        <james.morse@....com>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <bagasdotme@...il.com>,
        <eranian@...gle.com>
Subject: [PATCH v8 07/13] x86/resctrl: Introduce data structure to support
 monitor configuration

Add a new field in mon_evt to support Bandwidth Monitoring Event
Configuration(BMEC) and also update the "mon_features" display.

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 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@....com>
---
 arch/x86/kernel/cpu/resctrl/internal.h |    2 ++
 arch/x86/kernel/cpu/resctrl/monitor.c  |    6 ++++++
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |    5 ++++-
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index e30e8b23f6b5..5459b5022760 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -63,11 +63,13 @@ 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 efe0c30d3a12..06c2dc980855 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -750,6 +750,7 @@ int rdt_get_mon_l3_config(struct rdt_resource *r)
 {
 	unsigned int mbm_offset = boot_cpu_data.x86_cache_mbm_width_offset;
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
+	bool mon_configurable = rdt_cpu_has(X86_FEATURE_BMEC);
 	unsigned int threshold;
 	int ret;
 
@@ -783,6 +784,11 @@ int rdt_get_mon_l3_config(struct rdt_resource *r)
 	if (ret)
 		return ret;
 
+	if (mon_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 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;
 }