meta-arm/meta-arm-bsp/recipes-kernel/linux/linux-arm64-ack-5.10/tc/0027-perf-arm-cmn-Move-group-validation-data-off-stack.patch

From d919e8bcbb790018e097cb8a01e7c840dcdb82aa Mon Sep 17 00:00:00 2001
From: Robin Murphy <robin.murphy@arm.com>
Date: Fri, 3 Dec 2021 11:44:58 +0000
Subject: [PATCH 11/14] perf/arm-cmn: Move group validation data off-stack

With the value of CMN_MAX_DTMS increasing significantly, our validation
data structure is set to get quite big. Technically we could pack it at
least twice as densely, since we only need around 19 bits of information
per DTM, but that makes the code even more mind-bogglingly impenetrable,
and even half of "quite big" may still be uncomfortably large for a
stack frame (~1KB). Just move it to an off-stack allocation instead.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/0cabff2e5839ddc0979e757c55515966f65359e4.1638530442.git.robin.murphy@arm.com
Signed-off-by: Will Deacon <will@kernel.org>

Upstream-Status: Backport [https://lore.kernel.org/r/0cabff2e5839ddc0979e757c55515966f65359e4.1638530442.git.robin.murphy@arm.com]
Signed-off-by: Rupinderjit Singh <rupinderjit.singh@arm.com>
---
 drivers/perf/arm-cmn.c | 43 ++++++++++++++++++++++++------------------
 1 file changed, 25 insertions(+), 18 deletions(-)

diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c
index 2204d6500814..b89a081d26ff 100644
--- a/drivers/perf/arm-cmn.c
+++ b/drivers/perf/arm-cmn.c
@@ -876,8 +876,8 @@ static int arm_cmn_validate_group(struct perf_event *event)
 	struct arm_cmn_node *dn;
 	struct perf_event *sibling, *leader = event->group_leader;
 	enum cmn_node_type type;
-	struct arm_cmn_val val;
-	int i;
+	struct arm_cmn_val *val;
+	int i, ret = -EINVAL;
 	u8 occupid;
 
 	if (leader == event)
@@ -886,18 +886,22 @@ static int arm_cmn_validate_group(struct perf_event *event)
 	if (event->pmu != leader->pmu && !is_software_event(leader))
 		return -EINVAL;
 
-	memset(&val, 0, sizeof(val));
+	val = kzalloc(sizeof(*val), GFP_KERNEL);
+	if (!val)
+		return -ENOMEM;
 
-	arm_cmn_val_add_event(&val, leader);
+	arm_cmn_val_add_event(val, leader);
 	for_each_sibling_event(sibling, leader)
-		arm_cmn_val_add_event(&val, sibling);
+		arm_cmn_val_add_event(val, sibling);
 
 	type = CMN_EVENT_TYPE(event);
-	if (type == CMN_TYPE_DTC)
-		return val.cycles ? -EINVAL : 0;
+	if (type == CMN_TYPE_DTC) {
+		ret = val->cycles ? -EINVAL : 0;
+		goto done;
+	}
 
-	if (val.dtc_count == CMN_DT_NUM_COUNTERS)
-		return -EINVAL;
+	if (val->dtc_count == CMN_DT_NUM_COUNTERS)
+		goto done;
 
 	if (arm_cmn_is_occup_event(type, CMN_EVENT_EVENTID(event)))
 		occupid = CMN_EVENT_OCCUPID(event) + 1;
@@ -907,25 +911,28 @@ static int arm_cmn_validate_group(struct perf_event *event)
 	for_each_hw_dn(hw, dn, i) {
 		int wp_idx, wp_cmb, dtm = dn->dtm;
 
-		if (val.dtm_count[dtm] == CMN_DTM_NUM_COUNTERS)
-			return -EINVAL;
+		if (val->dtm_count[dtm] == CMN_DTM_NUM_COUNTERS)
+			goto done;
 
-		if (occupid && val.occupid[dtm] && occupid != val.occupid[dtm])
-			return -EINVAL;
+		if (occupid && val->occupid[dtm] && occupid != val->occupid[dtm])
+			goto done;
 
 		if (type != CMN_TYPE_WP)
 			continue;
 
 		wp_idx = arm_cmn_wp_idx(event);
-		if (val.wp[dtm][wp_idx])
-			return -EINVAL;
+		if (val->wp[dtm][wp_idx])
+			goto done;
 
-		wp_cmb = val.wp[dtm][wp_idx ^ 1];
+		wp_cmb = val->wp[dtm][wp_idx ^ 1];
 		if (wp_cmb && wp_cmb != CMN_EVENT_WP_COMBINE(event) + 1)
-			return -EINVAL;
+			goto done;
 	}
 
-	return 0;
+	ret = 0;
+done:
+	kfree(val);
+	return ret;
 }
 
 static int arm_cmn_event_init(struct perf_event *event)
-- 
2.25.1