From: Like Xu <like.xu.linux@gmail.com>
To: Sandipan Das <sandipan.das@amd.com>
Cc: peterz@infradead.org, bp@alien8.de, dave.hansen@linux.intel.com,
acme@kernel.org, mark.rutland@arm.com,
alexander.shishkin@linux.intel.com, namhyung@kernel.org,
jolsa@kernel.org, tglx@linutronix.de, mingo@redhat.com,
pbonzini@redhat.com, jmattson@google.com, eranian@google.com,
puwen@hygon.cn, ananth.narayan@amd.com, ravi.bangoria@amd.com,
santosh.shukla@amd.com,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
linux-perf-users@vger.kernel.org, x86@kernel.org
Subject: Re: [PATCH v4 6/7] perf/x86/amd/core: Add PerfMonV2 overflow handling
Date: Thu, 28 Apr 2022 21:40:05 +0800 [thread overview]
Message-ID: <5c227ef8-72d2-9254-f061-128974a6dc7d@gmail.com> (raw)
In-Reply-To: <6bb3a6de79afbdb1ebc1b804fb8c2002c00cbaee.1651058600.git.sandipan.das@amd.com>
On 27/4/2022 7:31 pm, Sandipan Das wrote:
> +static inline void amd_pmu_ack_global_status(u64 status)
> +{
> + /*
> + * PerfCntrGlobalStatus is read-only but an overflow acknowledgment
If wrmsrl PerfCntrGlobalStatus, remain silent or report #GP ?
> + * mechanism exists; writing 1 to a bit in PerfCntrGlobalStatusClr
> + * clears the same bit in PerfCntrGlobalStatus
> + */
> +
> + /* Only allow modifications to PerfCntrGlobalStatus.PerfCntrOvfl */
> + status &= amd_pmu_global_cntr_mask;
> + wrmsrl(MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_CLR, status);
If rdmsrl PerfCntrGlobalStatusClr, does it return 0 or the value of
PerfCntrGlobalStatus ?
> +}
next prev parent reply other threads:[~2022-04-28 13:40 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-27 11:31 [PATCH v4 0/7] perf/x86/amd/core: Add AMD PerfMonV2 support Sandipan Das
2022-04-27 11:31 ` [PATCH v4 1/7] x86/cpufeatures: Add PerfMonV2 feature bit Sandipan Das
2022-04-27 11:31 ` [PATCH v4 2/7] x86/msr: Add PerfCntrGlobal* registers Sandipan Das
2022-04-27 11:31 ` [PATCH v4 3/7] perf/x86/amd/core: Detect PerfMonV2 support Sandipan Das
2022-05-09 13:01 ` Like Xu
2022-05-09 13:08 ` Sandipan Das
2022-05-09 13:11 ` Peter Zijlstra
2022-05-10 8:36 ` Sandipan Das
2022-04-27 11:31 ` [PATCH v4 4/7] perf/x86/amd/core: Detect available counters Sandipan Das
2022-04-27 11:31 ` [PATCH v4 5/7] perf/x86/amd/core: Add PerfMonV2 counter control Sandipan Das
2022-05-09 7:05 ` Like Xu
2022-05-09 9:58 ` Sandipan Das
2022-05-09 11:24 ` Peter Zijlstra
2022-04-27 11:31 ` [PATCH v4 6/7] perf/x86/amd/core: Add PerfMonV2 overflow handling Sandipan Das
2022-04-28 13:40 ` Like Xu [this message]
2022-04-29 5:10 ` Sandipan Das
2022-04-27 11:31 ` [PATCH v4 7/7] kvm: x86/cpuid: Fix CPUID leaf 0xA Sandipan Das
2022-05-02 23:50 ` Jim Mattson
2022-05-03 12:01 ` Paolo Bonzini
2022-05-03 12:04 ` Paolo Bonzini
2022-04-27 11:37 ` [PATCH v4 0/7] perf/x86/amd/core: Add AMD PerfMonV2 support Borislav Petkov
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