linux-kernel - [tip: x86/cache] fs/resctrl: Introduce event configuration field in struct mon

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Message-ID: <175793566013.709179.9038379168796512019.tip-bot2@tip-bot2>
Date: Mon, 15 Sep 2025 11:27:40 -0000
From: "tip-bot2 for Babu Moger" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Babu Moger <babu.moger@....com>, "Borislav Petkov (AMD)" <bp@...en8.de>,
 Reinette Chatre <reinette.chatre@...el.com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: x86/cache] fs/resctrl: Introduce event configuration field in
 struct mon_evt

The following commit has been merged into the x86/cache branch of tip:

Commit-ID:     ebebda853633de389ba2c6737f8ca38405713e90
Gitweb:        https://git.kernel.org/tip/ebebda853633de389ba2c6737f8ca38405713e90
Author:        Babu Moger <babu.moger@....com>
AuthorDate:    Fri, 05 Sep 2025 16:34:14 -05:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Mon, 15 Sep 2025 12:18:31 +02:00

fs/resctrl: Introduce event configuration field in struct mon_evt

When supported, mbm_event counter assignment mode allows the user to configure
events to track specific types of memory transactions.

Introduce an evt_cfg field in struct mon_evt to define the type of memory
transactions tracked by a monitoring event. Also add a helper function to get
the evt_cfg value.

Signed-off-by: Babu Moger <babu.moger@....com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
Link: https://lore.kernel.org/cover.1757108044.git.babu.moger@amd.com
---
 fs/resctrl/internal.h   |  5 +++++
 fs/resctrl/monitor.c    | 10 ++++++++++
 include/linux/resctrl.h |  2 ++
 3 files changed, 17 insertions(+)

diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index 4f372e8..1cddfff 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -56,6 +56,10 @@ static inline struct rdt_fs_context *rdt_fc2context(struct fs_context *fc)
  * @evtid:		event id
  * @rid:		resource id for this event
  * @name:		name of the event
+ * @evt_cfg:		Event configuration value that represents the
+ *			memory transactions (e.g., READS_TO_LOCAL_MEM,
+ *			READS_TO_REMOTE_MEM) being tracked by @evtid.
+ *			Only valid if @evtid is an MBM event.
  * @configurable:	true if the event is configurable
  * @enabled:		true if the event is enabled
  */
@@ -63,6 +67,7 @@ struct mon_evt {
 	enum resctrl_event_id	evtid;
 	enum resctrl_res_level	rid;
 	char			*name;
+	u32			evt_cfg;
 	bool			configurable;
 	bool			enabled;
 };
diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
index 1fa82a6..f714e7b 100644
--- a/fs/resctrl/monitor.c
+++ b/fs/resctrl/monitor.c
@@ -882,6 +882,11 @@ bool resctrl_is_mon_event_enabled(enum resctrl_event_id eventid)
 	       mon_event_all[eventid].enabled;
 }
 
+u32 resctrl_get_mon_evt_cfg(enum resctrl_event_id evtid)
+{
+	return mon_event_all[evtid].evt_cfg;
+}
+
 int resctrl_mbm_assign_mode_show(struct kernfs_open_file *of,
 				 struct seq_file *s, void *v)
 {
@@ -1023,6 +1028,11 @@ int resctrl_mon_resource_init(void)
 			resctrl_enable_mon_event(QOS_L3_MBM_TOTAL_EVENT_ID);
 		if (!resctrl_is_mon_event_enabled(QOS_L3_MBM_LOCAL_EVENT_ID))
 			resctrl_enable_mon_event(QOS_L3_MBM_LOCAL_EVENT_ID);
+		mon_event_all[QOS_L3_MBM_TOTAL_EVENT_ID].evt_cfg = r->mon.mbm_cfg_mask;
+		mon_event_all[QOS_L3_MBM_LOCAL_EVENT_ID].evt_cfg = r->mon.mbm_cfg_mask &
+								   (READS_TO_LOCAL_MEM |
+								    READS_TO_LOCAL_S_MEM |
+								    NON_TEMP_WRITE_TO_LOCAL_MEM);
 		resctrl_file_fflags_init("num_mbm_cntrs",
 					 RFTYPE_MON_INFO | RFTYPE_RES_CACHE);
 		resctrl_file_fflags_init("available_mbm_cntrs",
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index e013cab..87daa4c 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -409,6 +409,8 @@ static inline bool resctrl_is_mbm_event(enum resctrl_event_id eventid)
 		eventid <= QOS_L3_MBM_LOCAL_EVENT_ID);
 }
 
+u32 resctrl_get_mon_evt_cfg(enum resctrl_event_id eventid);
+
 /* Iterate over all memory bandwidth events */
 #define for_each_mbm_event_id(eventid)				\
 	for (eventid = QOS_L3_MBM_TOTAL_EVENT_ID;		\