linux-kernel - [PATCH v2 12/16] x86/resctrl: Build lookup table for package events

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Message-ID: <20250321231609.57418-13-tony.luck@intel.com>
Date: Fri, 21 Mar 2025 16:16:02 -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>
Cc: linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev,
	Tony Luck <tony.luck@...el.com>
Subject: [PATCH v2 12/16] x86/resctrl: Build lookup table for package events

The resctrl filesystem saves the evt_type in the private data pointer
of the kernfs_node of each file in the mon_data directories.

To print the values for each file the show() function will need to map
from this evtid to:

num_rmids - to make sure data for this file exists
guid - to pick the pmt_event(s) for each package
stride/offset - to compute MMIO offset for this RMID/event

Build a lookup table for each event to save searching through
lists and add macros for ease of use.

Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 arch/x86/kernel/cpu/resctrl/intel_aet.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/intel_aet.c b/arch/x86/kernel/cpu/resctrl/intel_aet.c
index 9ac912742ef1..bab8e4de26b3 100644
--- a/arch/x86/kernel/cpu/resctrl/intel_aet.c
+++ b/arch/x86/kernel/cpu/resctrl/intel_aet.c
@@ -39,6 +39,18 @@ enum pmt_event_id {
 	PMT_NUM_EVENTS
 };
 
+static struct evtinfo {
+	struct telem_entry	*telem_entry;
+	struct pmt_event	*pmt_event;
+} evtinfo[PMT_NUM_EVENTS];
+
+#define EVT_NUM_RMIDS(evtid)	(evtinfo[evtid].telem_entry->num_rmids)
+#define EVT_STRIDE(evtid)	(evtinfo[evtid].telem_entry->stride)
+#define EVT_GUID(evtid)		(evtinfo[evtid].telem_entry->guid)
+
+#define EVT_OFFSET(evtid)	(evtinfo[evtid].pmt_event->evt_offset)
+#define EVT_TYPE(evtid)		(evtinfo[evtid].pmt_event->evt_type)
+
 /**
  * enum evt_type - Type for values for each event.
  * @EVT_U64:	Integer up to 64 bits
@@ -328,6 +340,9 @@ void rdt_get_intel_aet_mount(void)
 		for (int i = 0; (*tentry)->evts[i].evt.name; i++) {
 			evt = &(*tentry)->evts[i].evt;
 			list_add_tail(&evt->list, &r->evt_list);
+
+			evtinfo[evt->evtid].telem_entry = *tentry;
+			evtinfo[evt->evtid].pmt_event = &(*tentry)->evts[i];
 			ret = true;
 		}
 		if (!r->num_rmid)
-- 
2.48.1