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Subject: [PATCH v6 07/12] x86/resctrl: Add sysfs interface to read
 mbm_total_bytes event configuration
From:   Babu Moger <babu.moger@amd.com>
To:     <corbet@lwn.net>, <reinette.chatre@intel.com>,
        <tglx@linutronix.de>, <mingo@redhat.com>, <bp@alien8.de>
CC:     <fenghua.yu@intel.com>, <dave.hansen@linux.intel.com>,
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        <jpoimboe@kernel.org>, <pbonzini@redhat.com>, <babu.moger@amd.com>,
        <chang.seok.bae@intel.com>, <pawan.kumar.gupta@linux.intel.com>,
        <jmattson@google.com>, <daniel.sneddon@linux.intel.com>,
        <sandipan.das@amd.com>, <tony.luck@intel.com>,
        <james.morse@arm.com>, <linux-doc@vger.kernel.org>,
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        <eranian@google.com>
Date:   Mon, 10 Oct 2022 15:29:33 -0500
Message-ID: <166543377343.23830.10906905028303177147.stgit@bmoger-ubuntu>
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The current event configuration can be viewed by the user by reading=0A=
the configuration file /sys/fs/resctrl/info/L3_MON/mbm_total_config.=0A=
=0A=
Following are the types of events supported:=0A=
=0A=
=3D=3D=3D=3D  =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=0A=
Bits   Description=0A=
=3D=3D=3D=3D  =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=0A=
6      Dirty Victims from the QOS domain to all types of memory=0A=
5      Reads to slow memory in the non-local NUMA domain=0A=
4      Reads to slow memory in the local NUMA domain=0A=
3      Non-temporal writes to non-local NUMA domain=0A=
2      Non-temporal writes to local NUMA domain=0A=
1      Reads to memory in the non-local NUMA domain=0A=
0      Reads to memory in the local NUMA domain=0A=
=3D=3D=3D=3D  =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=0A=
=0A=
By default, the mbm_total_bytes configuration is set to 0x7f to count=0A=
all the event types. The event configuration settings are domain=0A=
specific. Changing the configuration on one CPU in a domain would=0A=
affect the whole domain.=0A=
=0A=
For example:=0A=
    $cat /sys/fs/resctrl/info/L3_MON/mbm_total_config=0A=
    0=3D0x7f;1=3D0x7f;2=3D0x7f;3=3D0x7f=0A=
=0A=
    In this case, the event mbm_total_bytes is currently configured=0A=
    with 0x7f on domains 0 to 3.=0A=
=0A=
Signed-off-by: Babu Moger <babu.moger@amd.com>=0A=
---=0A=
 arch/x86/kernel/cpu/resctrl/core.c     |    3 +=0A=
 arch/x86/kernel/cpu/resctrl/internal.h |    2 +=0A=
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |   76 ++++++++++++++++++++++++++++=
++++=0A=
 3 files changed, 81 insertions(+)=0A=
=0A=
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resct=
rl/core.c=0A=
index 46813b1c50c2..758c5d7553a4 100644=0A=
--- a/arch/x86/kernel/cpu/resctrl/core.c=0A=
+++ b/arch/x86/kernel/cpu/resctrl/core.c=0A=
@@ -826,6 +826,9 @@ static __init bool get_rdt_mon_resources(void)=0A=
 	if (!rdt_mon_features)=0A=
 		return false;=0A=
 =0A=
+	if (mon_configurable)=0A=
+		mbm_config_rftype_init();=0A=
+=0A=
 	return !rdt_get_mon_l3_config(r, mon_configurable);=0A=
 }=0A=
 =0A=
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/r=
esctrl/internal.h=0A=
index b458f768f30c..326a1b582f38 100644=0A=
--- a/arch/x86/kernel/cpu/resctrl/internal.h=0A=
+++ b/arch/x86/kernel/cpu/resctrl/internal.h=0A=
@@ -15,6 +15,7 @@=0A=
 #define MSR_IA32_MBA_THRTL_BASE		0xd50=0A=
 #define MSR_IA32_MBA_BW_BASE		0xc0000200=0A=
 #define MSR_IA32_SMBA_BW_BASE		0xc0000280=0A=
+#define MSR_IA32_EVT_CFG_BASE		0xc0000400=0A=
 =0A=
 #define MSR_IA32_QM_CTR			0x0c8e=0A=
 #define MSR_IA32_QM_EVTSEL		0x0c8d=0A=
@@ -541,5 +542,6 @@ bool has_busy_rmid(struct rdt_resource *r, struct rdt_d=
omain *d);=0A=
 void __check_limbo(struct rdt_domain *d, bool force_free);=0A=
 void rdt_domain_reconfigure_cdp(struct rdt_resource *r);=0A=
 void __init thread_throttle_mode_init(void);=0A=
+void __init mbm_config_rftype_init(void);=0A=
 =0A=
 #endif /* _ASM_X86_RESCTRL_INTERNAL_H */=0A=
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/r=
esctrl/rdtgroup.c=0A=
index 5f0ef1bf4c78..0982845594d0 100644=0A=
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c=0A=
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c=0A=
@@ -1423,6 +1423,67 @@ static int rdtgroup_size_show(struct kernfs_open_fil=
e *of,=0A=
 	return ret;=0A=
 }=0A=
 =0A=
+struct mon_config_info {=0A=
+	u32 evtid;=0A=
+	u32 mon_config;=0A=
+};=0A=
+=0A=
+static void mon_event_config_read(void *info)=0A=
+{=0A=
+	struct mon_config_info *mon_info =3D info;=0A=
+	u32 h, msr_index;=0A=
+=0A=
+	switch (mon_info->evtid) {=0A=
+	case QOS_L3_MBM_TOTAL_EVENT_ID:=0A=
+		msr_index =3D 0;=0A=
+		break;=0A=
+	case QOS_L3_MBM_LOCAL_EVENT_ID:=0A=
+		msr_index =3D 1;=0A=
+		break;=0A=
+	default:=0A=
+		/* Not expected to come here */=0A=
+		return;=0A=
+	}=0A=
+=0A=
+	rdmsr(MSR_IA32_EVT_CFG_BASE + msr_index, mon_info->mon_config, h);=0A=
+}=0A=
+=0A=
+static void mondata_config_read(struct rdt_domain *d, struct mon_config_in=
fo *mon_info)=0A=
+{=0A=
+	smp_call_function_any(&d->cpu_mask, mon_event_config_read, mon_info, 1);=
=0A=
+}=0A=
+=0A=
+static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32=
 evtid)=0A=
+{=0A=
+	struct mon_config_info mon_info =3D {0};=0A=
+	struct rdt_domain *dom;=0A=
+	bool sep =3D false;=0A=
+=0A=
+	list_for_each_entry(dom, &r->domains, list) {=0A=
+		if (sep)=0A=
+			seq_puts(s, ";");=0A=
+=0A=
+		mon_info.evtid =3D evtid;=0A=
+		mondata_config_read(dom, &mon_info);=0A=
+=0A=
+		seq_printf(s, "%d=3D0x%02x", dom->id, mon_info.mon_config);=0A=
+		sep =3D true;=0A=
+	}=0A=
+	seq_puts(s, "\n");=0A=
+=0A=
+	return 0;=0A=
+}=0A=
+=0A=
+static int mbm_total_config_show(struct kernfs_open_file *of,=0A=
+				 struct seq_file *seq, void *v)=0A=
+{=0A=
+	struct rdt_resource *r =3D of->kn->parent->priv;=0A=
+=0A=
+	mbm_config_show(seq, r, QOS_L3_MBM_TOTAL_EVENT_ID);=0A=
+=0A=
+	return 0;=0A=
+}=0A=
+=0A=
 /* rdtgroup information files for one cache resource. */=0A=
 static struct rftype res_common_files[] =3D {=0A=
 	{=0A=
@@ -1521,6 +1582,12 @@ static struct rftype res_common_files[] =3D {=0A=
 		.seq_show	=3D max_threshold_occ_show,=0A=
 		.fflags		=3D RF_MON_INFO | RFTYPE_RES_CACHE,=0A=
 	},=0A=
+	{=0A=
+		.name		=3D "mbm_total_config",=0A=
+		.mode		=3D 0644,=0A=
+		.kf_ops		=3D &rdtgroup_kf_single_ops,=0A=
+		.seq_show	=3D mbm_total_config_show,=0A=
+	},=0A=
 	{=0A=
 		.name		=3D "cpus",=0A=
 		.mode		=3D 0644,=0A=
@@ -1627,6 +1694,15 @@ void __init thread_throttle_mode_init(void)=0A=
 	rft->fflags =3D RF_CTRL_INFO | RFTYPE_RES_MB;=0A=
 }=0A=
 =0A=
+void __init mbm_config_rftype_init(void)=0A=
+{=0A=
+	struct rftype *rft;=0A=
+=0A=
+	rft =3D rdtgroup_get_rftype_by_name("mbm_total_config");=0A=
+	if (rft)=0A=
+		rft->fflags =3D RF_MON_INFO | RFTYPE_RES_CACHE;=0A=
+}=0A=
+=0A=
 /**=0A=
  * rdtgroup_kn_mode_restrict - Restrict user access to named resctrl file=
=0A=
  * @r: The resource group with which the file is associated.=0A=
=0A=