fs/resctrl: Add event configuration directory under info/L3_MON/

The "mbm_event" counter assignment mode allows the user to assign a hardware
counter to an RMID, event pair and monitor the bandwidth as long as it is
assigned. The user can specify the memory transaction(s) for the counter to
track.

When this mode is supported, the /sys/fs/resctrl/info/L3_MON/event_configs
directory contains a sub-directory for each MBM event that can be assigned to
a counter.  The MBM event sub-directory contains a file named "event_filter"
that is used to view and modify which memory transactions the MBM event is
configured with.

Create /sys/fs/resctrl/info/L3_MON/event_configs directory on resctrl mount
and pre-populate it with directories for the two existing MBM events:
mbm_total_bytes and mbm_local_bytes. Create the "event_filter" file within
each MBM event directory with the needed *show() that displays the memory
transactions with which the MBM event is configured.

Example:
  $ mount -t resctrl resctrl /sys/fs/resctrl
  $ cd /sys/fs/resctrl/
  $ cat info/L3_MON/event_configs/mbm_total_bytes/event_filter
    local_reads,remote_reads,local_non_temporal_writes,
    remote_non_temporal_writes,local_reads_slow_memory,
    remote_reads_slow_memory,dirty_victim_writes_all

  $ cat info/L3_MON/event_configs/mbm_local_bytes/event_filter
    local_reads,local_non_temporal_writes,local_reads_slow_memory

Signed-off-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/cover.1757108044.git.babu.moger@amd.com

3 files changed, 117 insertions, 2 deletions

diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index 2f1f2efe2f40..9bf2e2fd5c19 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -241,6 +241,8 @@ struct rdtgroup {
 
 #define RFTYPE_DEBUG			BIT(10)
 
+#define RFTYPE_ASSIGN_CONFIG		BIT(11)
+
 #define RFTYPE_CTRL_INFO		(RFTYPE_INFO | RFTYPE_CTRL)
 
 #define RFTYPE_MON_INFO			(RFTYPE_INFO | RFTYPE_MON)
@@ -403,6 +405,8 @@ void rdtgroup_assign_cntrs(struct rdtgroup *rdtgrp);
 
 void rdtgroup_unassign_cntrs(struct rdtgroup *rdtgrp);
 
+int event_filter_show(struct kernfs_open_file *of, struct seq_file *seq, void *v);
+
 #ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK
 int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp);
 
diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
index 55327056596e..7179f9865a48 100644
--- a/fs/resctrl/monitor.c
+++ b/fs/resctrl/monitor.c
@@ -972,6 +972,61 @@ u32 resctrl_get_mon_evt_cfg(enum resctrl_event_id evtid)
 	return mon_event_all[evtid].evt_cfg;
 }
 
+/**
+ * struct mbm_transaction - Memory transaction an MBM event can be configured with.
+ * @name:	Name of memory transaction (read, write ...).
+ * @val:	The bit (eg. READS_TO_LOCAL_MEM or READS_TO_REMOTE_MEM) used to
+ *		represent the memory transaction within an event's configuration.
+ */
+struct mbm_transaction {
+	char	name[32];
+	u32	val;
+};
+
+/* Decoded values for each type of memory transaction. */
+static struct mbm_transaction mbm_transactions[NUM_MBM_TRANSACTIONS] = {
+	{"local_reads", READS_TO_LOCAL_MEM},
+	{"remote_reads", READS_TO_REMOTE_MEM},
+	{"local_non_temporal_writes", NON_TEMP_WRITE_TO_LOCAL_MEM},
+	{"remote_non_temporal_writes", NON_TEMP_WRITE_TO_REMOTE_MEM},
+	{"local_reads_slow_memory", READS_TO_LOCAL_S_MEM},
+	{"remote_reads_slow_memory", READS_TO_REMOTE_S_MEM},
+	{"dirty_victim_writes_all", DIRTY_VICTIMS_TO_ALL_MEM},
+};
+
+int event_filter_show(struct kernfs_open_file *of, struct seq_file *seq, void *v)
+{
+	struct mon_evt *mevt = rdt_kn_parent_priv(of->kn);
+	struct rdt_resource *r;
+	bool sep = false;
+	int ret = 0, i;
+
+	mutex_lock(&rdtgroup_mutex);
+	rdt_last_cmd_clear();
+
+	r = resctrl_arch_get_resource(mevt->rid);
+	if (!resctrl_arch_mbm_cntr_assign_enabled(r)) {
+		rdt_last_cmd_puts("mbm_event counter assignment mode is not enabled\n");
+		ret = -EINVAL;
+		goto out_unlock;
+	}
+
+	for (i = 0; i < NUM_MBM_TRANSACTIONS; i++) {
+		if (mevt->evt_cfg & mbm_transactions[i].val) {
+			if (sep)
+				seq_putc(seq, ',');
+			seq_printf(seq, "%s", mbm_transactions[i].name);
+			sep = true;
+		}
+	}
+	seq_putc(seq, '\n');
+
+out_unlock:
+	mutex_unlock(&rdtgroup_mutex);
+
+	return ret;
+}
+
 /*
  * rdtgroup_assign_cntr() - Assign/unassign the counter ID for the event, RMID
  * pair in the domain.
@@ -1287,6 +1342,7 @@ int resctrl_mon_resource_init(void)
 					 RFTYPE_MON_INFO | RFTYPE_RES_CACHE);
 		resctrl_file_fflags_init("available_mbm_cntrs",
 					 RFTYPE_MON_INFO | RFTYPE_RES_CACHE);
+		resctrl_file_fflags_init("event_filter", RFTYPE_ASSIGN_CONFIG);
 	}
 
 	return 0;
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index 2e1d0a2703da..8f0c403e3fb5 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -1924,6 +1924,12 @@ static struct rftype res_common_files[] = {
 		.write		= mbm_local_bytes_config_write,
 	},
 	{
+		.name		= "event_filter",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= event_filter_show,
+	},
+	{
 		.name		= "mbm_assign_mode",
 		.mode		= 0444,
 		.kf_ops		= &rdtgroup_kf_single_ops,
@@ -2183,10 +2189,48 @@ int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name,
 	return ret;
 }
 
+static int resctrl_mkdir_event_configs(struct rdt_resource *r, struct kernfs_node *l3_mon_kn)
+{
+	struct kernfs_node *kn_subdir, *kn_subdir2;
+	struct mon_evt *mevt;
+	int ret;
+
+	kn_subdir = kernfs_create_dir(l3_mon_kn, "event_configs", l3_mon_kn->mode, NULL);
+	if (IS_ERR(kn_subdir))
+		return PTR_ERR(kn_subdir);
+
+	ret = rdtgroup_kn_set_ugid(kn_subdir);
+	if (ret)
+		return ret;
+
+	for_each_mon_event(mevt) {
+		if (mevt->rid != r->rid || !mevt->enabled || !resctrl_is_mbm_event(mevt->evtid))
+			continue;
+
+		kn_subdir2 = kernfs_create_dir(kn_subdir, mevt->name, kn_subdir->mode, mevt);
+		if (IS_ERR(kn_subdir2)) {
+			ret = PTR_ERR(kn_subdir2);
+			goto out;
+		}
+
+		ret = rdtgroup_kn_set_ugid(kn_subdir2);
+		if (ret)
+			goto out;
+
+		ret = rdtgroup_add_files(kn_subdir2, RFTYPE_ASSIGN_CONFIG);
+		if (ret)
+			break;
+	}
+
+out:
+	return ret;
+}
+
 static int rdtgroup_mkdir_info_resdir(void *priv, char *name,
 				      unsigned long fflags)
 {
 	struct kernfs_node *kn_subdir;
+	struct rdt_resource *r;
 	int ret;
 
 	kn_subdir = kernfs_create_dir(kn_info, name,
@@ -2199,8 +2243,19 @@ static int rdtgroup_mkdir_info_resdir(void *priv, char *name,
 		return ret;
 
 	ret = rdtgroup_add_files(kn_subdir, fflags);
-	if (!ret)
-		kernfs_activate(kn_subdir);
+	if (ret)
+		return ret;
+
+	if ((fflags & RFTYPE_MON_INFO) == RFTYPE_MON_INFO) {
+		r = priv;
+		if (r->mon.mbm_cntr_assignable) {
+			ret = resctrl_mkdir_event_configs(r, kn_subdir);
+			if (ret)
+				return ret;
+		}
+	}
+
+	kernfs_activate(kn_subdir);
 
 	return ret;
 }