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Message-ID: <ff1e0c31-488a-a054-ebc4-189eabf0b186@arm.com>
Date:   Wed, 13 Jul 2022 11:10:32 +0530
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Subject: Re: [PATCH V6 0/8] perf: Expand perf_branch_entry
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To:     linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
        peterz@infradead.org, alexander.shishkin@linux.intel.com,
        jolsa@redhat.com, acme@kernel.org
Cc:     Robin Murphy <robin.murphy@arm.com>,
        Suzuki Poulose <suzuki.poulose@arm.com>,
        James Clark <james.clark@arm.com>,
        Ingo Molnar <mingo@redhat.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Namhyung Kim <namhyung@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Will Deacon <will@kernel.org>,
        linux-arm-kernel@lists.infradead.org
References: <20220610035101.424112-1-anshuman.khandual@arm.com>
From:   Anshuman Khandual <anshuman.khandual@arm.com>
In-Reply-To: <20220610035101.424112-1-anshuman.khandual@arm.com>
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On 6/10/22 09:20, Anshuman Khandual wrote:
> Branch Record Buffer Extension (BRBE) implementation on arm64 captures more
> branch type classification which cannot be accommodated in the current perf
> branch record format via perf_branch_entry.type element (4 bit field). Also
> it captures privilege information which does not have a corresponding slot
> in perf_branch_entry. This series expands struct perf_branch_entry, to meet
> both these requirements without breaking the existing user space ABI for
> perf tools.
> 
> All architecture specific branch types added via perf_branch_entry.new_type
> field in [PATCH 3/4] will be used in BRBE implementation on arm64 platform
> later on with the following map.
> 
> #ifdef CONFIG_ARM64
> #define PERF_BR_FIQ		PERF_BR_NEW_ARCH_1
> #define PERF_BR_DEBUG_HALT	PERF_BR_NEW_ARCH_2
> #define PERF_BR_DEBUG_EXIT	PERF_BR_NEW_ARCH_3
> #define PERF_BR_DEBUG_INST	PERF_BR_NEW_ARCH_4
> #define PERF_BR_DEBUG_DATA	PERF_BR_NEW_ARCH_5
> #endif
> 
> This series applies on v5.19-rc1
> 
> perf API
> 
> The series being applied
> 
> - Clean : tools/perf/check-headers.sh
> - Clean : diff -u tools/include/uapi/linux/perf_event.h include/uapi/linux/perf_event.h
> 
> References
> 
> - BRBE captured branch record information
> 
> https://developer.arm.com/documentation/ddi0601/2021-12/AArch64-Registers/BRBINF-n--EL1--Branch-Record-Buffer-Information-Register--n-?lang=en
> 
> - BRBE based perf branch stack implementation on arm64 platform
> 
> https://lore.kernel.org/all/1642998653-21377-1-git-send-email-anshuman.khandual@arm.com/
> 
> Changes in V6:
> 
> - Process PERF_BR_EXTEND_ABI in perf tools and fetch from perf_branch_entry.new_type
> - Modified the commit message for [PATCH 1/8]

Any updates on this series ?