linux-kernel - [PATCH v3 12/26] fs/resctrl: Add hook for architecture code to set monitor event attributes

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Message-ID: <20250407234032.241215-13-tony.luck@intel.com>
Date: Mon,  7 Apr 2025 16:40:14 -0700
From: Tony Luck <tony.luck@...el.com>
To: Fenghua Yu <fenghuay@...dia.com>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>,
	Peter Newman <peternewman@...gle.com>,
	James Morse <james.morse@....com>,
	Babu Moger <babu.moger@....com>,
	Drew Fustini <dfustini@...libre.com>,
	Dave Martin <Dave.Martin@....com>,
	Anil Keshavamurthy <anil.s.keshavamurthy@...el.com>
Cc: linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev,
	Tony Luck <tony.luck@...el.com>
Subject: [PATCH v3 12/26] fs/resctrl: Add hook for architecture code to set monitor event attributes

Architecture code knows whether an event can be read from any CPU, or
from a CPU on a specific domain. It also knows what format to use
when printing each event value.

Add a hook to set mon_event.any_cpu and mon_event.type.

Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 include/linux/resctrl.h |  3 +++
 fs/resctrl/monitor.c    | 12 ++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 0fce626605b9..8ac77b738de5 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -418,6 +418,9 @@ void resctrl_offline_mon_domain(struct rdt_resource *r, struct rdt_mon_domain *d
 void resctrl_online_cpu(unsigned int cpu);
 void resctrl_offline_cpu(unsigned int cpu);
 
+int resctrl_set_event_attributes(enum resctrl_event_id evt,
+				 enum resctrl_event_type type, bool any_cpu);
+
 /**
  * resctrl_arch_rmid_read() - Read the eventid counter corresponding to rmid
  *			      for this resource and domain.
diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
index 1efad57d1d85..5846a13c631a 100644
--- a/fs/resctrl/monitor.c
+++ b/fs/resctrl/monitor.c
@@ -863,6 +863,18 @@ static struct mon_evt all_events[QOS_NUM_EVENTS] = {
 	},
 };
 
+int resctrl_set_event_attributes(enum resctrl_event_id evt,
+				 enum resctrl_event_type type, bool any_cpu)
+{
+	if (evt >= QOS_NUM_EVENTS)
+		return -ENOENT;
+
+	all_events[evt].type = type;
+	all_events[evt].any_cpu = any_cpu;
+
+	return 0;
+}
+
 int rdt_lookup_evtid_by_name(char *name)
 {
 	int evt;
-- 
2.48.1