[PATCH v12 19/26] x86/resctrl: Add event configuration directory under info/L3_MON/

[Babu Moger]

Create the configuration directory and files for mbm_cntr_assign mode.
These configurations will be used to assign MBM events in mbm_cntr_assign
mode, with two default configurations created upon mounting.

Example:
$ cd /sys/fs/resctrl/
$ cat info/L3_MON/counter_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/counter_configs/mbm_local_bytes/event_filter
  local_reads, local_non_temporal_writes, local_reads_slow_memory

Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
---
v12: New patch to hold the MBM event configurations for mbm_cntr_assign mode.
---
 Documentation/arch/x86/resctrl.rst     | 29 ++++++++++
 arch/x86/kernel/cpu/resctrl/internal.h |  2 +
 arch/x86/kernel/cpu/resctrl/monitor.c  |  1 +
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 77 ++++++++++++++++++++++++++
 4 files changed, 109 insertions(+)

diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index 71ed1cfed33a..99f9f4b9b501 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -306,6 +306,35 @@ with the following files:
 	  # cat /sys/fs/resctrl/info/L3_MON/available_mbm_cntrs
 	  0=30;1=30
 
+"counter_configs:
+	The directory for storing event configuration files, which will be used to
+	assign counters when the mbm_cntr_assign mode is enabled.
+
+	Following types of events are supported:
+
+	==== ========================= ============================================================
+	Bits Name   		         Description
+	==== ========================= ============================================================
+	6    dirty_victim_writes_all     Dirty Victims from the QOS domain to all types of memory
+	5    remote_reads_slow_memory    Reads to slow memory in the non-local NUMA domain
+	4    local_reads_slow_memory     Reads to slow memory in the local NUMA domain
+	3    remote_non_temporal_writes  Non-temporal writes to non-local NUMA domain
+	2    local_non_temporal_writes   Non-temporal writes to local NUMA domain
+	1    remote_reads                Reads to memory in the non-local NUMA domain
+	0    local_reads                 Reads to memory in the local NUMA domain
+	==== ========================= ==========================================================
+
+	Two default configurations, mbm_local_bytes and mbm_total_bytes, will be created
+	upon mounting.
+	::
+
+	    # cat /sys/fs/resctrl/info/L3_MON/counter_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 /sys/fs/resctrl/info/L3_MON/counter_configs/mbm_local_bytes/event_filter
+	    local_reads, local_non_temporal_writes, local_reads_slow_memory
+
 "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/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index b7d1a59f09f8..a943450bf2c8 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -282,11 +282,13 @@ struct mbm_cntr_cfg {
 #define RFTYPE_RES_CACHE		BIT(8)
 #define RFTYPE_RES_MB			BIT(9)
 #define RFTYPE_DEBUG			BIT(10)
+#define RFTYPE_CONFIG			BIT(11)
 #define RFTYPE_CTRL_INFO		(RFTYPE_INFO | RFTYPE_CTRL)
 #define RFTYPE_MON_INFO			(RFTYPE_INFO | RFTYPE_MON)
 #define RFTYPE_TOP_INFO			(RFTYPE_INFO | RFTYPE_TOP)
 #define RFTYPE_CTRL_BASE		(RFTYPE_BASE | RFTYPE_CTRL)
 #define RFTYPE_MON_BASE			(RFTYPE_BASE | RFTYPE_MON)
+#define RFTYPE_MON_CONFIG		(RFTYPE_CONFIG | RFTYPE_MON)
 
 /* List of all resource groups */
 extern struct list_head rdt_all_groups;
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 58476c065921..4525295b1725 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -1264,6 +1264,7 @@ int __init resctrl_mon_resource_init(void)
 	if (r->mon.mbm_cntr_assignable) {
 		resctrl_file_fflags_init("num_mbm_cntrs", RFTYPE_MON_INFO);
 		resctrl_file_fflags_init("available_mbm_cntrs", RFTYPE_MON_INFO);
+		resctrl_file_fflags_init("event_filter", RFTYPE_MON_CONFIG);
 	}
 
 	return 0;
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index aba23e2096db..b2122a1dd36c 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1907,6 +1907,25 @@ static ssize_t mbm_local_bytes_config_write(struct kernfs_open_file *of,
 	return ret ?: nbytes;
 }
 
+static int event_filter_show(struct kernfs_open_file *of, struct seq_file *seq, void *v)
+{
+	struct mbm_assign_config *assign_config = of->kn->parent->priv;
+	bool sep = false;
+	int i;
+
+	for (i = 0; i < NUM_MBM_EVT_VALUES; i++) {
+		if (assign_config->val & mbm_evt_values[i].evt_val) {
+			if (sep)
+				seq_puts(seq, ", ");
+			seq_printf(seq, "%s", mbm_evt_values[i].evt_name);
+			sep = true;
+		}
+	}
+	seq_puts(seq, "\n");
+
+	return 0;
+}
+
 /* rdtgroup information files for one cache resource. */
 static struct rftype res_common_files[] = {
 	{
@@ -2019,6 +2038,12 @@ static struct rftype res_common_files[] = {
 		.seq_show	= mbm_local_bytes_config_show,
 		.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,
@@ -2314,6 +2339,52 @@ static int rdtgroup_mkdir_info_resdir(void *priv, char *name,
 	return ret;
 }
 
+static int resctrl_mkdir_info_configs(void *priv,  char *name, unsigned long fflags)
+{
+	struct kernfs_node *l3_mon_kn, *kn_subdir, *kn_subdir2;
+	int ret, i;
+
+	l3_mon_kn = kernfs_find_and_get(kn_info, name);
+	if (!l3_mon_kn)
+		return -ENOENT;
+
+	kn_subdir = kernfs_create_dir(l3_mon_kn, "counter_configs", l3_mon_kn->mode, priv);
+	if (IS_ERR(kn_subdir)) {
+		kernfs_put(l3_mon_kn);
+		return PTR_ERR(kn_subdir);
+	}
+
+	ret = rdtgroup_kn_set_ugid(kn_subdir);
+	if (ret) {
+		kernfs_put(l3_mon_kn);
+		return ret;
+	}
+
+	for (i = 0; i < NUM_MBM_ASSIGN_CONFIGS; i++) {
+		kn_subdir2 = kernfs_create_dir(kn_subdir, mbm_assign_configs[i].name,
+					       kn_subdir->mode, &mbm_assign_configs[i]);
+		if (IS_ERR(kn_subdir)) {
+			ret = PTR_ERR(kn_subdir2);
+			goto config_out;
+		}
+
+		ret = rdtgroup_kn_set_ugid(kn_subdir2);
+		if (ret)
+			goto config_out;
+
+		ret = rdtgroup_add_files(kn_subdir2, fflags);
+		if (!ret)
+			kernfs_activate(kn_subdir);
+	}
+
+config_out:
+	kernfs_put(l3_mon_kn);
+	if (ret)
+		kernfs_remove(kn_subdir);
+
+	return ret;
+}
+
 static unsigned long fflags_from_resource(struct rdt_resource *r)
 {
 	switch (r->rid) {
@@ -2360,6 +2431,12 @@ static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn)
 		ret = rdtgroup_mkdir_info_resdir(r, name, fflags);
 		if (ret)
 			goto out_destroy;
+
+		if (r->mon.mbm_cntr_assignable) {
+			ret = resctrl_mkdir_info_configs(r, name, RFTYPE_MON_CONFIG);
+			if (ret)
+				goto out_destroy;
+		}
 	}
 
 	ret = rdtgroup_kn_set_ugid(kn_info);
-- 
2.34.1