linux-kernel - [PATCH] drivers: perf: arm_pmuv3: Update 'pmc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20231009043724.175100-1-anshuman.khandual@arm.com>
Date:   Mon,  9 Oct 2023 10:07:24 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] drivers: perf: arm_pmuv3: Update 'pmc_width' based on actual HW event width

This updates 'perf_event_mmap_page->pmc_width' based on actual HW event's
width that are currently missing i.e ARMPMU_EVT_63BIT and ARMPMU_EVT_47BIT.

Cc: Will Deacon <will@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
This applies on v6.6-rc5.

 drivers/perf/arm_pmuv3.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/perf/arm_pmuv3.c b/drivers/perf/arm_pmuv3.c
index fe4db1831662..94723d00548e 100644
--- a/drivers/perf/arm_pmuv3.c
+++ b/drivers/perf/arm_pmuv3.c
@@ -1375,6 +1375,10 @@ void arch_perf_update_userpage(struct perf_event *event,
 	if (userpg->cap_user_rdpmc) {
 		if (event->hw.flags & ARMPMU_EVT_64BIT)
 			userpg->pmc_width = 64;
+		else if (event->hw.flags & ARMPMU_EVT_63BIT)
+			userpg->pmc_width = 63;
+		else if (event->hw.flags & ARMPMU_EVT_47BIT)
+			userpg->pmc_width = 47;
 		else
 			userpg->pmc_width = 32;
 	}
-- 
2.25.1