xref: /linux/arch/parisc/kernel/perf_event.c (revision 8cc8ea228c4199482cf087fc6ed2d6e31b7a49e2) 
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Performance event support for parisc
4  *
5  * Copyright (C) 2025 by Helge Deller <deller@gmx.de>
6  */
7 
8 #include <linux/kernel.h>
9 #include <linux/perf_event.h>
10 #include <asm/unwind.h>
11 
perf_callchain_kernel(struct perf_callchain_entry_ctx * entry,struct pt_regs * regs)12 void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
13 			   struct pt_regs *regs)
14 {
15 
16 	struct unwind_frame_info info;
17 
18 	unwind_frame_init_task(&info, current, NULL);
19 	while (1) {
20 		if (unwind_once(&info) < 0 || info.ip == 0)
21 			break;
22 
23 		if (!__kernel_text_address(info.ip) ||
24 			perf_callchain_store(entry, info.ip))
25 				return;
26 	}
27 }
28