linux-kernel - [PATCH] arm64: perf: Don't disgard upper 32 bits from PMCEID0/1 registers

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Message-ID: <20231025200815.104017-1-ilkka@os.amperecomputing.com>
Date:   Wed, 25 Oct 2023 13:08:15 -0700
From:   Ilkka Koskinen <ilkka@...amperecomputing.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Zaid Al-Bassam <zalbassam@...gle.com>,
        Marc Zyngier <maz@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Mark Rutland <mark.rutland@....com>,
        Ilkka Koskinen <ilkka@...amperecomputing.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] arm64: perf: Don't disgard upper 32 bits from PMCEID0/1 registers

The upper 32 bits of PMCEID[n] registers are used to describe whether
architectural and microarchitectural events in range 0x4000-0x401f
exist. Due to disgarding the bits, the driver made the events invisible,
even if they existed.

Fixes: df29ddf4f04b ("arm64: perf: Abstract system register accesses away")
Reported-by: Carl Worth <carl@...amperecomputing.com>
Signed-off-by: Ilkka Koskinen <ilkka@...amperecomputing.com>
---
 arch/arm64/include/asm/arm_pmuv3.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/arm_pmuv3.h b/arch/arm64/include/asm/arm_pmuv3.h
index 18dc2fb3d7b7..3e92b7cb57a4 100644
--- a/arch/arm64/include/asm/arm_pmuv3.h
+++ b/arch/arm64/include/asm/arm_pmuv3.h
@@ -126,12 +126,12 @@ static inline void write_pmuserenr(u32 val)
 	write_sysreg(val, pmuserenr_el0);
 }
 
-static inline u32 read_pmceid0(void)
+static inline u64 read_pmceid0(void)
 {
 	return read_sysreg(pmceid0_el0);
 }
 
-static inline u32 read_pmceid1(void)
+static inline u64 read_pmceid1(void)
 {
 	return read_sysreg(pmceid1_el0);
 }
-- 
2.41.0