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X-CSE-ConnectionGUID: M6r1P7bcT/q1OIM+8gWu7w== X-CSE-MsgGUID: JfpVoY/yTOKNRXhQGWWoFQ== X-IronPort-AV: E=McAfee;i="6700,10204,11351"; a="40724584" X-IronPort-AV: E=Sophos;i="6.13,302,1732608000"; d="scan'208";a="40724584" Received: from orviesa004.jf.intel.com ([10.64.159.144]) by fmvoesa111.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Feb 2025 08:28:01 -0800 X-CSE-ConnectionGUID: QPQ3ayuXRsWwW4MyBur1ag== X-CSE-MsgGUID: YdwgBcqmTUWIjGDGp1zMMg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.13,302,1732608000"; d="scan'208";a="120070989" Received: from puneetse-mobl.amr.corp.intel.com (HELO [10.125.110.82]) ([10.125.110.82]) by orviesa004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Feb 2025 08:28:00 -0800 Message-ID: Date: Thu, 20 Feb 2025 08:28:01 -0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] perf/x86/rapl: Fix PP1 event for Intel Meteor/Lunar Lake To: Lucas De Marchi , linux-perf-users@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org Cc: dave.hansen@linux.intel.com, Zhang Rui , Kan Liang , Peter Zijlstra , Ingo Molnar , Ulisses Furquim , intel-xe@lists.freedesktop.org, intel-gfx@lists.freedesktop.org References: <20250220153857.2593704-6-lucas.demarchi@intel.com> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 2/20/25 07:36, Lucas De Marchi wrote: > On some boots the read of MSR_PP1_ENERGY_STATUS msr returns 0, causing > perf_msr_probe() to make the power/events/energy-gpu event non-visible. > When that happens, the msr always read 0 until the graphics module (i915 > for Meteor Lake, xe for Lunar Lake) is loaded. Then it starts returning > something different and re-loading the rapl module "fixes" it. What's the root cause here? Did the kernel do something funky? Or is this a hardware bug?