linux-kernel - [PATCH v2 1/3] perf: Add perf_event_attr::bp

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Date: Fri, 21 Jun 2024 15:39:08 +0800
From: Tiezhu Yang <yangtiezhu@...ngson.cn>
To: Will Deacon <will@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Russell King <linux@...linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/3] perf: Add perf_event_attr::bp_priv

Add a member "bp_priv" at the end of the uapi struct perf_event_attr
to make a bridge between ptrace and hardware breakpoint.

This is preparation for later patch on some archs such as ARM, ARM64
and LoongArch which have privilege level of breakpoint.

Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
---
 include/uapi/linux/perf_event.h | 3 +++
 kernel/events/hw_breakpoint.c   | 1 +
 2 files changed, 4 insertions(+)

diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index 3a64499b0f5d..f9f917e854e6 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -379,6 +379,7 @@ enum perf_event_read_format {
 #define PERF_ATTR_SIZE_VER6	120	/* add: aux_sample_size */
 #define PERF_ATTR_SIZE_VER7	128	/* add: sig_data */
 #define PERF_ATTR_SIZE_VER8	136	/* add: config3 */
+#define PERF_ATTR_SIZE_VER9	144	/* add: bp_priv */
 
 /*
  * Hardware event_id to monitor via a performance monitoring event:
@@ -522,6 +523,8 @@ struct perf_event_attr {
 	__u64	sig_data;
 
 	__u64	config3; /* extension of config2 */
+
+	__u8	bp_priv; /* privilege level of breakpoint */
 };
 
 /*
diff --git a/kernel/events/hw_breakpoint.c b/kernel/events/hw_breakpoint.c
index 6c2cb4e4f48d..3ad16b226e4f 100644
--- a/kernel/events/hw_breakpoint.c
+++ b/kernel/events/hw_breakpoint.c
@@ -754,6 +754,7 @@ static void hw_breakpoint_copy_attr(struct perf_event_attr *to,
 	to->bp_addr = from->bp_addr;
 	to->bp_type = from->bp_type;
 	to->bp_len  = from->bp_len;
+	to->bp_priv = from->bp_priv;
 	to->disabled = from->disabled;
 }
 
-- 
2.42.0