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Message-ID: <a7a62f49523aabba1afdeb469c8df393e182acd8.1728495588.git.babu.moger@amd.com>
Date: Wed, 9 Oct 2024 12:39:49 -0500
From: Babu Moger <babu.moger@....com>
To: <corbet@....net>, <fenghua.yu@...el.com>, <reinette.chatre@...el.com>,
<tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
<dave.hansen@...ux.intel.com>
CC: <x86@...nel.org>, <hpa@...or.com>, <paulmck@...nel.org>,
<rdunlap@...radead.org>, <tj@...nel.org>, <peterz@...radead.org>,
<yanjiewtw@...il.com>, <babu.moger@....com>, <kim.phillips@....com>,
<lukas.bulwahn@...il.com>, <seanjc@...gle.com>, <jmattson@...gle.com>,
<leitao@...ian.org>, <jpoimboe@...nel.org>, <rick.p.edgecombe@...el.com>,
<kirill.shutemov@...ux.intel.com>, <jithu.joseph@...el.com>,
<kai.huang@...el.com>, <kan.liang@...ux.intel.com>,
<daniel.sneddon@...ux.intel.com>, <pbonzini@...hat.com>,
<sandipan.das@....com>, <ilpo.jarvinen@...ux.intel.com>,
<peternewman@...gle.com>, <maciej.wieczor-retman@...el.com>,
<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<eranian@...gle.com>, <james.morse@....com>
Subject: [PATCH v8 24/25] x86/resctrl: Introduce interface to list assignment states of all the groups
Provide the interface to list the assignment states of all the resctrl
groups in mbm_cntr_assign mode.
Example:
$mount -t resctrl resctrl /sys/fs/resctrl/
$cat /sys/fs/resctrl/info/L3_MON/mbm_assign_control
//0=tl;1=tl;
List follows the following format:
"<CTRL_MON group>/<MON group>/<domain_id>=<flags>"
Format for specific type of groups:
- Default CTRL_MON group:
"//<domain_id>=<flags>"
- Non-default CTRL_MON group:
"<CTRL_MON group>//<domain_id>=<flags>"
- Child MON group of default CTRL_MON group:
"/<MON group>/<domain_id>=<flags>"
- Child MON group of non-default CTRL_MON group:
"<CTRL_MON group>/<MON group>/<domain_id>=<flags>"
Flags can be one of the following:
t MBM total event is enabled
l MBM local event is enabled
tl Both total and local MBM events are enabled
_ None of the MBM events are enabled
Signed-off-by: Babu Moger <babu.moger@....com>
---
v8: Moved resctrl_mbm_event_assigned() in here as it is first used here.
Moved rdt_last_cmd_clear() before making any call.
Updated the commit log.
Corrected the doc format.
v7: Renamed the interface name from 'mbm_control' to 'mbm_assign_control'
to match 'mbm_assign_mode'.
Removed Arch references from FS code.
Added rdt_last_cmd_clear() before the command processing.
Added rdtgroup_mutex before all the calls.
Removed references of ABMC from FS code.
v6: The domain specific assignment can be determined looking at mbm_cntr_map.
Removed rdtgroup_abmc_dom_cfg() and rdtgroup_abmc_dom_state().
Removed the switch statement for the domain_state detection.
Determined the flags incremently.
Removed special handling of default group while printing..
v5: Replaced "assignment flags" with "flags".
Changes related to mon structure.
Changes related renaming the interface from mbm_assign_control to
mbm_control.
v4: Added functionality to query domain specific assigment in.
rdtgroup_abmc_dom_state().
v3: New patch.
Addresses the feedback to provide the global assignment interface.
https://lore.kernel.org/lkml/c73f444b-83a1-4e9a-95d3-54c5165ee782@intel.com/
---
Documentation/arch/x86/resctrl.rst | 44 +++++++++++++++
arch/x86/kernel/cpu/resctrl/monitor.c | 1 +
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 76 ++++++++++++++++++++++++++
3 files changed, 121 insertions(+)
diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index d9574078f735..b85d3bc3e301 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -310,6 +310,50 @@ with the following files:
The number of monitoring counters available for assignment when the
architecture supports mbm_cntr_assign mode.
+"mbm_assign_control":
+ Reports the resctrl group and monitor status of each group.
+
+ List follows the following format:
+ "<CTRL_MON group>/<MON group>/<domain_id>=<flags>"
+
+ Format for specific type of groups:
+
+ * Default CTRL_MON group:
+ "//<domain_id>=<flags>"
+
+ * Non-default CTRL_MON group:
+ "<CTRL_MON group>//<domain_id>=<flags>"
+
+ * Child MON group of default CTRL_MON group:
+ "/<MON group>/<domain_id>=<flags>"
+
+ * Child MON group of non-default CTRL_MON group:
+ "<CTRL_MON group>/<MON group>/<domain_id>=<flags>"
+
+ Flags can be one of the following:
+ ::
+
+ t MBM total event is assigned.
+ l MBM local event is assigned.
+ tl Both total and local MBM events are assigned.
+ _ None of the MBM events are assigned.
+
+ Examples:
+ ::
+
+ # mkdir /sys/fs/resctrl/mon_groups/child_default_mon_grp
+ # mkdir /sys/fs/resctrl/non_default_ctrl_mon_grp
+ # mkdir /sys/fs/resctrl/non_default_ctrl_mon_grp/mon_groups/child_non_default_mon_grp
+
+ # cat /sys/fs/resctrl/info/L3_MON/mbm_assign_control
+ non_default_ctrl_mon_grp//0=tl;1=tl;
+ non_default_ctrl_mon_grp/child_non_default_mon_grp/0=tl;1=tl;
+ //0=tl;1=tl;
+ /child_default_mon_grp/0=tl;1=tl;
+
+ There are four resctrl groups. All the groups have total and local MBM events
+ assigned on domain 0 and 1.
+
"max_threshold_occupancy":
Read/write file provides the largest value (in
bytes) at which a previously used LLC_occupancy
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 395d99984893..fa7c77935080 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -1269,6 +1269,7 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
r->mon.num_mbm_cntrs = (ebx & GENMASK(15, 0)) + 1;
resctrl_file_fflags_init("num_mbm_cntrs", RFTYPE_MON_INFO);
hw_res->mbm_cntr_assign_enabled = true;
+ resctrl_file_fflags_init("mbm_assign_control", RFTYPE_MON_INFO);
}
}
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index cf2e0ad0e4f4..cf92ceb0f05e 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -970,6 +970,76 @@ static int rdtgroup_num_mbm_cntrs_show(struct kernfs_open_file *of,
return 0;
}
+static bool resctrl_mbm_event_assigned(struct rdtgroup *rdtg,
+ struct rdt_mon_domain *d, u32 evtid)
+{
+ int index = MBM_EVENT_ARRAY_INDEX(evtid);
+ int cntr_id = rdtg->mon.cntr_id[index];
+
+ return cntr_id != MON_CNTR_UNSET && test_bit(cntr_id, d->mbm_cntr_map);
+}
+
+static char *rdtgroup_mon_state_to_str(struct rdtgroup *rdtgrp,
+ struct rdt_mon_domain *d, char *str)
+{
+ char *tmp = str;
+
+ /* Query the total and local event flags for the domain */
+ if (resctrl_mbm_event_assigned(rdtgrp, d, QOS_L3_MBM_TOTAL_EVENT_ID))
+ *tmp++ = 't';
+
+ if (resctrl_mbm_event_assigned(rdtgrp, d, QOS_L3_MBM_LOCAL_EVENT_ID))
+ *tmp++ = 'l';
+
+ if (tmp == str)
+ *tmp++ = '_';
+
+ *tmp = '\0';
+ return str;
+}
+
+static int rdtgroup_mbm_assign_control_show(struct kernfs_open_file *of,
+ struct seq_file *s, void *v)
+{
+ struct rdt_resource *r = of->kn->parent->priv;
+ struct rdt_mon_domain *dom;
+ struct rdtgroup *rdtg;
+ char str[10];
+
+ mutex_lock(&rdtgroup_mutex);
+ rdt_last_cmd_clear();
+
+ if (!resctrl_arch_mbm_cntr_assign_enabled(r)) {
+ rdt_last_cmd_puts("mbm_cntr_assign mode is not enabled\n");
+ mutex_unlock(&rdtgroup_mutex);
+ return -EINVAL;
+ }
+
+ list_for_each_entry(rdtg, &rdt_all_groups, rdtgroup_list) {
+ struct rdtgroup *crg;
+
+ seq_printf(s, "%s//", rdtg->kn->name);
+
+ list_for_each_entry(dom, &r->mon_domains, hdr.list)
+ seq_printf(s, "%d=%s;", dom->hdr.id,
+ rdtgroup_mon_state_to_str(rdtg, dom, str));
+ seq_putc(s, '\n');
+
+ list_for_each_entry(crg, &rdtg->mon.crdtgrp_list,
+ mon.crdtgrp_list) {
+ seq_printf(s, "%s/%s/", rdtg->kn->name, crg->kn->name);
+
+ list_for_each_entry(dom, &r->mon_domains, hdr.list)
+ seq_printf(s, "%d=%s;", dom->hdr.id,
+ rdtgroup_mon_state_to_str(crg, dom, str));
+ seq_putc(s, '\n');
+ }
+ }
+
+ mutex_unlock(&rdtgroup_mutex);
+ return 0;
+}
+
#ifdef CONFIG_PROC_CPU_RESCTRL
/*
@@ -2256,6 +2326,12 @@ static struct rftype res_common_files[] = {
.kf_ops = &rdtgroup_kf_single_ops,
.seq_show = rdtgroup_num_mbm_cntrs_show,
},
+ {
+ .name = "mbm_assign_control",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = rdtgroup_mbm_assign_control_show,
+ },
{
.name = "cpus_list",
.mode = 0644,
--
2.34.1
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