From 05e59e5fb0064c97a1c10921ecd549f2d4a58565 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Wed, 09 Oct 2024 06:14:40 +0000
Subject: [PATCH] add REDIRECT
---
kernel/kernel/events/hw_breakpoint.c | 33 ++++++++++++++++++---------------
1 files changed, 18 insertions(+), 15 deletions(-)
diff --git a/kernel/kernel/events/hw_breakpoint.c b/kernel/kernel/events/hw_breakpoint.c
index bf3f2d3..b48d703 100644
--- a/kernel/kernel/events/hw_breakpoint.c
+++ b/kernel/kernel/events/hw_breakpoint.c
@@ -1,18 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0+
/*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
* Copyright (C) 2007 Alan Stern
* Copyright (C) IBM Corporation, 2009
* Copyright (C) 2009, Frederic Weisbecker <fweisbec@gmail.com>
@@ -226,6 +213,15 @@
list_del(&bp->hw.bp_list);
}
+__weak int arch_reserve_bp_slot(struct perf_event *bp)
+{
+ return 0;
+}
+
+__weak void arch_release_bp_slot(struct perf_event *bp)
+{
+}
+
/*
* Function to perform processor-specific cleanup during unregistration
*/
@@ -238,7 +234,7 @@
}
/*
- * Contraints to check before allowing this new breakpoint counter:
+ * Constraints to check before allowing this new breakpoint counter:
*
* == Non-pinned counter == (Considered as pinned for now)
*
@@ -283,6 +279,7 @@
struct bp_busy_slots slots = {0};
enum bp_type_idx type;
int weight;
+ int ret;
/* We couldn't initialize breakpoint constraints on boot */
if (!constraints_initialized)
@@ -307,6 +304,10 @@
if (slots.pinned + (!!slots.flexible) > nr_slots[type])
return -ENOSPC;
+ ret = arch_reserve_bp_slot(bp);
+ if (ret)
+ return ret;
+
toggle_bp_slot(bp, true, type, weight);
return 0;
@@ -330,6 +331,8 @@
enum bp_type_idx type;
int weight;
+ arch_release_bp_slot(bp);
+
type = find_slot_idx(bp_type);
weight = hw_breakpoint_weight(bp);
toggle_bp_slot(bp, false, type, weight);
--
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