linux-kernel - [PATCH v2 32/45] arm_mpam: resctrl: Add resctrl_arch_config

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20251219181147.3404071-33-ben.horgan@arm.com>
Date: Fri, 19 Dec 2025 18:11:34 +0000
From: Ben Horgan <ben.horgan@....com>
To: ben.horgan@....com
Cc: amitsinght@...vell.com,
	baisheng.gao@...soc.com,
	baolin.wang@...ux.alibaba.com,
	carl@...amperecomputing.com,
	dave.martin@....com,
	david@...nel.org,
	dfustini@...libre.com,
	fenghuay@...dia.com,
	gshan@...hat.com,
	james.morse@....com,
	jonathan.cameron@...wei.com,
	kobak@...dia.com,
	lcherian@...vell.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	peternewman@...gle.com,
	punit.agrawal@....qualcomm.com,
	quic_jiles@...cinc.com,
	reinette.chatre@...el.com,
	rohit.mathew@....com,
	scott@...amperecomputing.com,
	sdonthineni@...dia.com,
	tan.shaopeng@...itsu.com,
	xhao@...ux.alibaba.com,
	catalin.marinas@....com,
	will@...nel.org,
	corbet@....net,
	maz@...nel.org,
	oupton@...nel.org,
	joey.gouly@....com,
	suzuki.poulose@....com,
	kvmarm@...ts.linux.dev
Subject: [PATCH v2 32/45] arm_mpam: resctrl: Add resctrl_arch_config_cntr() for ABMC use

From: James Morse <james.morse@....com>

ABMC has a helper resctrl_arch_config_cntr() for changing the mapping
between 'cntr_id' and a CLOSID/RMID pair.

Add the helper.

For MPAM this is done by updating the mon->mbwu_idx_to_mon[] array, and as
usual CDP means it needs doing in three different ways.

Signed-off-by: James Morse <james.morse@....com>
Signed-off-by: Ben Horgan <ben.horgan@....com>
---
 drivers/resctrl/mpam_resctrl.c | 37 ++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/drivers/resctrl/mpam_resctrl.c b/drivers/resctrl/mpam_resctrl.c
index e96d320c219c..328a81ab68b4 100644
--- a/drivers/resctrl/mpam_resctrl.c
+++ b/drivers/resctrl/mpam_resctrl.c
@@ -765,6 +765,43 @@ static void mpam_resctrl_pick_counters(void)
 			     mpam_resctrl_counters[QOS_L3_MBM_TOTAL_EVENT_ID].class);
 }
 
+static void __config_cntr(struct mpam_resctrl_mon *mon, u32 cntr_id,
+			  enum resctrl_conf_type cdp_type, u32 closid, u32 rmid,
+			  bool assign)
+{
+	u32 mbwu_idx, mon_idx = resctrl_get_config_index(cntr_id, cdp_type);
+
+	closid = resctrl_get_config_index(closid, cdp_type);
+	mbwu_idx = resctrl_arch_rmid_idx_encode(closid, rmid);
+	WARN_ON_ONCE(mon_idx > l3_num_allocated_mbwu);
+
+	if (assign)
+		mon->mbwu_idx_to_mon[mbwu_idx] = mon->assigned_counters[mon_idx];
+	else
+		mon->mbwu_idx_to_mon[mbwu_idx] = -1;
+}
+
+void resctrl_arch_config_cntr(struct rdt_resource *r, struct rdt_mon_domain *d,
+			      enum resctrl_event_id evtid, u32 rmid, u32 closid,
+			      u32 cntr_id, bool assign)
+{
+	struct mpam_resctrl_mon *mon = &mpam_resctrl_counters[evtid];
+
+	if (!mon->mbwu_idx_to_mon || !mon->assigned_counters) {
+		pr_debug("monitor arrays not allocated\n");
+		return;
+	}
+
+	if (cdp_enabled) {
+		__config_cntr(mon, cntr_id, CDP_CODE, closid, rmid, assign);
+		__config_cntr(mon, cntr_id, CDP_DATA, closid, rmid, assign);
+	} else {
+		__config_cntr(mon, cntr_id, CDP_NONE, closid, rmid, assign);
+	}
+
+	resctrl_arch_reset_rmid(r, d, closid, rmid, evtid);
+}
+
 bool resctrl_arch_mbm_cntr_assign_enabled(struct rdt_resource *r)
 {
 	if (r != &mpam_resctrl_controls[RDT_RESOURCE_L3].resctrl_res)
-- 
2.43.0