linux-kernel - [PATCH v14 23/32] fs/resctrl: Add definitions for MBM event configuration

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Message-ID: <dbd02fa64c22ec933ba27e69ded8288d4d4ae9a1.1749848715.git.babu.moger@amd.com>
Date: Fri, 13 Jun 2025 16:05:07 -0500
From: Babu Moger <babu.moger@....com>
To: <babu.moger@....com>, <corbet@....net>, <tony.luck@...el.com>,
	<reinette.chatre@...el.com>, <Dave.Martin@....com>, <james.morse@....com>,
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Subject: [PATCH v14 23/32] fs/resctrl: Add definitions for MBM event configuration

The "mbm_event" mode allows the user to assign a hardware counter ID to
an RMID, event pair and monitor the bandwidth as long as it is assigned.
Additionally, the user can specify a particular type of memory
transactions for the counter to track.

By default, each resctrl group supports two MBM events: mbm_total_bytes
and mbm_local_bytes. Each event corresponds to an MBM configuration that
specifies the memory transactions being tracked by the event.

Add definitions for supported memory transactions (e.g., read, write,
etc.).

Signed-off-by: Babu Moger <babu.moger@....com>
---
v14: Changed the term memory events to memory transactions to be consistant.
     Changed the name of the structure to mbm_config_value(from mbm_evt_value).
     Changed name to memory trasactions where applicable.
     Changes subject line to fs/resctrl.

v13: Updated the changelog.
     Removed the definitions from resctrl_types.h and moved to internal.h.
     Removed mbm_assign_config definition. Configurations will be part of
     mon_evt list.
     Resolved conflicts caused by the recent FS/ARCH code restructure.
     The rdtgroup.c file has now been split between the FS and ARCH directories.

v12: New patch to support event configurations via new counter_configs
     method.
---
 fs/resctrl/internal.h | 11 +++++++++++
 fs/resctrl/rdtgroup.c | 14 ++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index 4a7130018aa1..84a136194d9a 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -212,6 +212,17 @@ struct rdtgroup {
 	struct pseudo_lock_region	*plr;
 };
 
+/**
+ * struct mbm_config_value - Memory transaction an MBM event can be configured with.
+ * @name:	Name of memory transaction (read, write ...).
+ * @val:	The bit used to represent the memory transaction within an
+ *		event's configuration.
+ */
+struct mbm_config_value {
+	char	name[32];
+	u32	val;
+};
+
 /* rdtgroup.flags */
 #define	RDT_DELETED		1
 
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index 08bcca9bd8b6..5fb6a9939e23 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -75,6 +75,20 @@ static void rdtgroup_destroy_root(void);
 
 struct dentry *debugfs_resctrl;
 
+/* Number of memory transactions that an MBM event can be configured with. */
+#define NUM_MBM_EVT_VALUES             7
+
+/* Decoded values for each type of memory transactions */
+struct mbm_config_value mbm_config_values[NUM_MBM_EVT_VALUES] = {
+	{"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},
+};
+
 /*
  * Memory bandwidth monitoring event to use for the default CTRL_MON group
  * and each new CTRL_MON group created by the user.  Only relevant when
-- 
2.34.1