From 674cd7740257a27e3f81a0b66c9f6e65912eaca6 Mon Sep 17 00:00:00 2001 From: Robin Murphy Date: Tue, 18 Mar 2025 14:32:10 +0000 Subject: [PATCH] perf/arm-cmn: Remove CMN-600 DTC domain special case The special case for trying to infer the DTC domain for DTC-adjacent nodes on CMN-600 is fragile and buggy - currently resulting in subtly messed up DTC counter allocation - and the theoretical benefit it offers to a tiny minority of use-cases arguably doesn't outweigh the inconsistency it offers to others anyway. Just get rid of it. Fixes: ab33c66fd8f1 ("perf/arm-cmn: Enable per-DTC counter allocation") Signed-off-by: Robin Murphy Link: https://lore.kernel.org/r/67985e39f53b56385d79a4f1264cf7f9cacedb58.1742308248.git.robin.murphy@arm.com Signed-off-by: Will Deacon --- drivers/perf/arm-cmn.c | 7 ------- 1 file changed, 7 deletions(-) diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c index d4fe30ff225b..92720592fee9 100644 --- a/drivers/perf/arm-cmn.c +++ b/drivers/perf/arm-cmn.c @@ -2167,13 +2167,6 @@ static int arm_cmn_init_dtcs(struct arm_cmn *cmn) cmn->xps = arm_cmn_node(cmn, CMN_TYPE_XP); - if (cmn->part == PART_CMN600 && cmn->num_dtcs > 1) { - /* We do at least know that a DTC's XP must be in that DTC's domain */ - dn = arm_cmn_node(cmn, CMN_TYPE_DTC); - for (int i = 0; i < cmn->num_dtcs; i++) - arm_cmn_node_to_xp(cmn, dn + i)->dtc = i; - } - for (dn = cmn->dns; dn->type; dn++) { if (dn->type == CMN_TYPE_XP) continue; -- 2.50.1