linux-kernel - [RFC PATCH V2 6/9] tools headers UAPI: Sync linux/perf

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Message-Id: <20230213190754.1836051-7-kan.liang@linux.intel.com>
Date:   Mon, 13 Feb 2023 11:07:51 -0800
From:   kan.liang@...ux.intel.com
To:     tglx@...utronix.de, jstultz@...gle.com, peterz@...radead.org,
        mingo@...hat.com, linux-kernel@...r.kernel.org
Cc:     sboyd@...nel.org, eranian@...gle.com, namhyung@...nel.org,
        ak@...ux.intel.com, adrian.hunter@...el.com,
        Kan Liang <kan.liang@...ux.intel.com>
Subject: [RFC PATCH V2 6/9] tools headers UAPI: Sync linux/perf_event.h with the kernel sources

From: Kan Liang <kan.liang@...ux.intel.com>

The kernel ABI has been extended to support tool based monotonic raw
conversion.

This thus partially addresses this perf build warning:

Warning: Kernel ABI header at 'tools/include/uapi/linux/perf_event.h'
differs from latest version at 'include/uapi/linux/perf_event.h'
diff -u tools/include/uapi/linux/perf_event.h include/uapi/linux/perf_event.h

Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
---
 tools/include/uapi/linux/perf_event.h | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/tools/include/uapi/linux/perf_event.h b/tools/include/uapi/linux/perf_event.h
index ccb7f5dad59b..9d56fe027f6c 100644
--- a/tools/include/uapi/linux/perf_event.h
+++ b/tools/include/uapi/linux/perf_event.h
@@ -455,7 +455,8 @@ struct perf_event_attr {
 				inherit_thread :  1, /* children only inherit if cloned with CLONE_THREAD */
 				remove_on_exec :  1, /* event is removed from task on exec */
 				sigtrap        :  1, /* send synchronous SIGTRAP on event */
-				__reserved_1   : 26;
+				hw_time        :  1, /* generate raw HW time for samples */
+				__reserved_1   : 25;
 
 	union {
 		__u32		wakeup_events;	  /* wakeup every n events */
@@ -615,7 +616,8 @@ struct perf_event_mmap_page {
 				cap_user_time		: 1, /* The time_{shift,mult,offset} fields are used */
 				cap_user_time_zero	: 1, /* The time_zero field is used */
 				cap_user_time_short	: 1, /* the time_{cycle,mask} fields are used */
-				cap_____res		: 58;
+				cap_user_time_mono_raw  : 1, /* The time_mono_* fields are used */
+				cap_____res		: 57;
 		};
 	};
 
@@ -692,11 +694,24 @@ struct perf_event_mmap_page {
 	__u64	time_cycles;
 	__u64	time_mask;
 
+	/*
+	 * If cap_user_time_mono_raw, the monotonic raw clock can be calculated
+	 * from the hardware clock (e.g. TSC) 'cyc'.
+	 *
+	 * mono_raw = base + ((cyc - last) * mult + nsec) >> shift
+	 *
+	 */
+	__u64	time_mono_last;
+	__u32	time_mono_mult;
+	__u32	time_mono_shift;
+	__u64	time_mono_nsec;
+	__u64	time_mono_base;
+
 		/*
 		 * Hole for extension of the self monitor capabilities
 		 */
 
-	__u8	__reserved[116*8];	/* align to 1k. */
+	__u8	__reserved[112*8];	/* align to 1k. */
 
 	/*
 	 * Control data for the mmap() data buffer.
-- 
2.35.1