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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>,
	<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>,
	<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>, <linux-kernel@vger.kernel.org>,
	<bagasdotme@gmail.com>, <eranian@google.com>,
	<christophe.leroy@csgroup.eu>,
	<pawan.kumar.gupta@linux.intel.com>, <jarkko@kernel.org>,
	<adrian.hunter@intel.com>, <quic_jiles@quicinc.com>,
	<peternewman@google.com>
Subject: [PATCH v9 10/13] x86/resctrl: Add sysfs interface to write mbm_total_bytes_config
Date: Thu, 1 Dec 2022 09:37:10 -0600	[thread overview]
Message-ID: <166990903030.17806.5106229901730558377.stgit@bmoger-ubuntu> (raw)
In-Reply-To: <166990882621.17806.16780480657453071426.stgit@bmoger-ubuntu>

The current event configuration for mbm_total_bytes can be changed by
the user by writing to the file
/sys/fs/resctrl/info/L3_MON/mbm_total_bytes_config.

The event configuration settings are domain specific and will affect all
the CPUs in the domain.

Following are the types of events supported:

====  ===========================================================
Bits   Description
====  ===========================================================
6      Dirty Victims from the QOS domain to all types of memory
5      Reads to slow memory in the non-local NUMA domain
4      Reads to slow memory in the local NUMA domain
3      Non-temporal writes to non-local NUMA domain
2      Non-temporal writes to local NUMA domain
1      Reads to memory in the non-local NUMA domain
0      Reads to memory in the local NUMA domain
====  ===========================================================

For example:
To change the mbm_total_bytes to count only reads on domain 0, the bits
0, 1, 4 and 5 needs to be set, which is 110011b (in hex 0x33). Run the
command.
	$echo  0=0x33 > /sys/fs/resctrl/info/L3_MON/mbm_total_bytes_config

To change the mbm_total_bytes to count all the slow memory reads on
domain 1, the bits 4 and 5 needs to be set which is 110000b (in hex 0x30).
Run the command.
	$echo  1=0x30 > /sys/fs/resctrl/info/L3_MON/mbm_total_bytes_config

Signed-off-by: Babu Moger <babu.moger@amd.com>
---
 arch/x86/kernel/cpu/resctrl/monitor.c  |   13 +++
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |  127 ++++++++++++++++++++++++++++++++
 include/linux/resctrl.h                |   10 +++
 3 files changed, 149 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 7c8a3a745041..b265856835de 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -176,6 +176,19 @@ void resctrl_arch_reset_rmid(struct rdt_resource *r, struct rdt_domain *d,
 		memset(am, 0, sizeof(*am));
 }
 
+void resctrl_arch_reset_rmid_all(struct rdt_resource *r, struct rdt_domain *d)
+{
+	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
+
+	if (is_mbm_total_enabled())
+		memset(hw_dom->arch_mbm_total, 0,
+		       sizeof(*hw_dom->arch_mbm_total) * r->num_rmid);
+
+	if (is_mbm_local_enabled())
+		memset(hw_dom->arch_mbm_local, 0,
+		       sizeof(*hw_dom->arch_mbm_local) * r->num_rmid);
+}
+
 static u64 mbm_overflow_count(u64 prev_msr, u64 cur_msr, unsigned int width)
 {
 	u64 shift = 64 - width, chunks;
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 580f3cce19e2..8a22a652a6e8 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1517,6 +1517,130 @@ static int mbm_local_bytes_config_show(struct kernfs_open_file *of,
 	return 0;
 }
 
+static void mon_event_config_write(void *info)
+{
+	struct mon_config_info *mon_info = info;
+	u32 index;
+
+	index = mon_event_config_index_get(mon_info->evtid);
+	if (index == INVALID_CONFIG_INDEX) {
+		pr_warn_once("Invalid event id %d\n", mon_info->evtid);
+		return;
+	}
+	wrmsr(MSR_IA32_EVT_CFG_BASE + index, mon_info->mon_config, 0);
+}
+
+static int mbm_config_write_domain(struct rdt_resource *r,
+				   struct rdt_domain *d, u32 evtid, u32 val)
+{
+	struct mon_config_info mon_info = {0};
+	int ret = 0;
+
+	/* mon_config cannot be more than the supported set of events */
+	if (val > MAX_EVT_CONFIG_BITS) {
+		rdt_last_cmd_puts("Invalid event configuration\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * Read the current config value first. If both are the same then
+	 * no need to write it again.
+	 */
+	mon_info.evtid = evtid;
+	mondata_config_read(d, &mon_info);
+	if (mon_info.mon_config == val)
+		goto out;
+
+	mon_info.mon_config = val;
+
+	/*
+	 * Update MSR_IA32_EVT_CFG_BASE MSRs on all the CPUs in the
+	 * domain. The MSRs offset from MSR MSR_IA32_EVT_CFG_BASE
+	 * are scoped at the domain level. Writing any of these MSRs
+	 * on one CPU is supposed to be observed by all CPUs in the
+	 * domain. However, the hardware team recommends to update
+	 * these MSRs on all the CPUs in the domain.
+	 */
+	on_each_cpu_mask(&d->cpu_mask, mon_event_config_write, &mon_info, 1);
+
+	/*
+	 * When an Event Configuration is changed, the bandwidth counters
+	 * for all RMIDs and Events will be cleared by the hardware. The
+	 * hardware also sets MSR_IA32_QM_CTR.Unavailable (bit 62) for
+	 * every RMID on the next read to any event for every RMID.
+	 * Subsequent reads will have MSR_IA32_QM_CTR.Unavailable (bit 62)
+	 * cleared while it is tracked by the hardware. Clear the
+	 * mbm_local and mbm_total counts for all the RMIDs.
+	 */
+	resctrl_arch_reset_rmid_all(r, d);
+
+out:
+	return ret;
+}
+
+static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
+{
+	char *dom_str = NULL, *id_str;
+	unsigned long dom_id, val;
+	struct rdt_domain *d;
+	int ret = 0;
+
+next:
+	if (!tok || tok[0] == '\0')
+		return 0;
+
+	/* Start processing the strings for each domain */
+	dom_str = strim(strsep(&tok, ";"));
+	id_str = strsep(&dom_str, "=");
+
+	if (!id_str || kstrtoul(id_str, 10, &dom_id)) {
+		rdt_last_cmd_puts("Missing '=' or non-numeric domain id\n");
+		return -EINVAL;
+	}
+
+	if (!dom_str || kstrtoul(dom_str, 16, &val)) {
+		rdt_last_cmd_puts("Non-numeric event configuration value\n");
+		return -EINVAL;
+	}
+
+	list_for_each_entry(d, &r->domains, list) {
+		if (d->id == dom_id) {
+			ret = mbm_config_write_domain(r, d, evtid, val);
+			if (ret)
+				return -EINVAL;
+			goto next;
+		}
+	}
+
+	return -EINVAL;
+}
+
+static ssize_t mbm_total_bytes_config_write(struct kernfs_open_file *of,
+					    char *buf, size_t nbytes,
+					    loff_t off)
+{
+	struct rdt_resource *r = of->kn->parent->priv;
+	int ret;
+
+	/* Valid input requires a trailing newline */
+	if (nbytes == 0 || buf[nbytes - 1] != '\n')
+		return -EINVAL;
+
+	cpus_read_lock();
+	mutex_lock(&rdtgroup_mutex);
+
+	rdt_last_cmd_clear();
+
+	buf[nbytes - 1] = '\0';
+
+	ret = mon_config_write(r, buf, QOS_L3_MBM_TOTAL_EVENT_ID);
+
+	mutex_unlock(&rdtgroup_mutex);
+	cpus_read_unlock();
+
+	return ret ?: nbytes;
+}
+
 /* rdtgroup information files for one cache resource. */
 static struct rftype res_common_files[] = {
 	{
@@ -1617,9 +1741,10 @@ static struct rftype res_common_files[] = {
 	},
 	{
 		.name		= "mbm_total_bytes_config",
-		.mode		= 0444,
+		.mode		= 0644,
 		.kf_ops		= &rdtgroup_kf_single_ops,
 		.seq_show	= mbm_total_bytes_config_show,
+		.write		= mbm_total_bytes_config_write,
 	},
 	{
 		.name		= "mbm_local_bytes_config",
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 0cee154abc9f..e4dc65892446 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -250,6 +250,16 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_domain *d,
 void resctrl_arch_reset_rmid(struct rdt_resource *r, struct rdt_domain *d,
 			     u32 rmid, enum resctrl_event_id eventid);
 
+/**
+ * resctrl_arch_reset_rmid_all() - Reset any private state associated with
+ * 				   all the rmids.
+ * @r:		The domain's resource.
+ * @d:		The rmid's domain.
+ *
+ * This can be called from any CPU.
+ */
+void resctrl_arch_reset_rmid_all(struct rdt_resource *r, struct rdt_domain *d);
+
 extern unsigned int resctrl_rmid_realloc_threshold;
 extern unsigned int resctrl_rmid_realloc_limit;
 



  parent reply	other threads:[~2022-12-01 15:37 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-12-01 15:35 [PATCH v9 00/13] Support for AMD QoS new features Babu Moger
2022-12-01 15:36 ` [PATCH v9 01/13] x86/cpufeatures: Add Slow Memory Bandwidth Allocation feature flag Babu Moger
2022-12-15 17:08   ` Reinette Chatre
2022-12-15 21:10     ` Moger, Babu
2022-12-01 15:36 ` [PATCH v9 02/13] x86/resctrl: Add a new resource type RDT_RESOURCE_SMBA Babu Moger
2022-12-15 17:10   ` Reinette Chatre
2022-12-15 21:30     ` Moger, Babu
2022-12-01 15:36 ` [PATCH v9 03/13] x86/cpufeatures: Add Bandwidth Monitoring Event Configuration feature flag Babu Moger
2022-12-15 17:11   ` Reinette Chatre
2022-12-19 15:31     ` Moger, Babu
2022-12-01 15:36 ` [PATCH v9 04/13] x86/resctrl: Include new features in command line options Babu Moger
2022-12-15 17:12   ` Reinette Chatre
2022-12-19 15:33     ` Moger, Babu
2022-12-01 15:36 ` [PATCH v9 05/13] x86/resctrl: Detect and configure Slow Memory Bandwidth Allocation Babu Moger
2022-12-15 17:13   ` Reinette Chatre
2022-12-19 15:34     ` Moger, Babu
2022-12-01 15:36 ` [PATCH v9 06/13] x86/resctrl: Add __init attribute to rdt_get_mon_l3_config() Babu Moger
2022-12-15 17:17   ` Reinette Chatre
2022-12-19 15:51     ` Moger, Babu
2022-12-01 15:36 ` [PATCH v9 07/13] x86/resctrl: Introduce data structure to support monitor configuration Babu Moger
2022-12-15 17:19   ` Reinette Chatre
2022-12-19 17:56     ` Moger, Babu
2022-12-01 15:36 ` [PATCH v9 08/13] x86/resctrl: Add sysfs interface to read mbm_total_bytes_config Babu Moger
2022-12-15 17:40   ` Reinette Chatre
2022-12-19 18:21     ` Moger, Babu
2022-12-01 15:37 ` [PATCH v9 09/13] x86/resctrl: Add sysfs interface to read mbm_local_bytes_config Babu Moger
2022-12-15 17:43   ` Reinette Chatre
2022-12-19 18:27     ` Moger, Babu
2022-12-01 15:37 ` Babu Moger [this message]
2022-12-15 18:24   ` [PATCH v9 10/13] x86/resctrl: Add sysfs interface to write mbm_total_bytes_config Reinette Chatre
2022-12-19 19:28     ` Moger, Babu
2022-12-20 17:32       ` Reinette Chatre
2022-12-20 18:58         ` Moger, Babu
2022-12-19 19:50     ` Moger, Babu
2022-12-20 17:32       ` Reinette Chatre
2022-12-20 18:00         ` Moger, Babu
2022-12-01 15:37 ` [PATCH v9 11/13] x86/resctrl: Add sysfs interface to write mbm_local_bytes_config Babu Moger
2022-12-15 18:25   ` Reinette Chatre
2022-12-19 19:51     ` Moger, Babu
2022-12-01 15:37 ` [PATCH v9 12/13] x86/resctrl: Replace smp_call_function_many() with on_each_cpu_mask() Babu Moger
2022-12-15 18:26   ` Reinette Chatre
2022-12-19 19:59     ` Moger, Babu
2022-12-01 15:37 ` [PATCH v9 13/13] Documentation/x86: Update resctrl.rst for new features Babu Moger
2022-12-15 18:30   ` Reinette Chatre
2022-12-19 20:05     ` Moger, Babu
2022-12-15 15:08 ` [PATCH v9 00/13] Support for AMD QoS " Moger, Babu
2022-12-15 15:35   ` Reinette Chatre
2022-12-15 16:12     ` Moger, Babu
2022-12-15 18:38 ` Reinette Chatre
2022-12-19 20:57   ` Moger, Babu

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