From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx3.molgen.mpg.de (mx3.molgen.mpg.de [141.14.17.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CE5C742AA3; Tue, 28 Jan 2025 15:09:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=141.14.17.11 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738076979; cv=none; b=WT26PlzshKP4gJg0PlgBx+3y4AFqUHxN4MygaUxJz+ttRON05nKTF45iMoFmKSIIzCT+cE1s2eTLZW2HtVsYrdnotHD2QIK10yFiF6JFCly2WzwB2ek9fb4uS41nvAgeyWVZpykkhCwdTXtvpzlchlhSeUgqUzjPIN36CIXmJyM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738076979; c=relaxed/simple; bh=bsjmKyniqMWd6rhrX4DwYWCF9H1Bh7oTRUwDP+gUhfQ=; h=Message-ID:Date:MIME-Version:Subject:From:To:Cc:References: In-Reply-To:Content-Type; b=nEqIZSdXnEqcmyFLgGL5x0C033DM7yiprk5LRpEx84F9Jju9/HpO5GAKAOZ80YrfzOhjkEmMAbWSmrvIpr0C5YHKl1NZugmFavNxw7fZOjzT4K4G2wtN551WT1ETLTxsR0F99fpqgdBErZGUDjj/luhbB0rY8vuRSNkQApj1eQM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=molgen.mpg.de; spf=pass smtp.mailfrom=molgen.mpg.de; arc=none smtp.client-ip=141.14.17.11 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=molgen.mpg.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=molgen.mpg.de Received: from [141.14.220.45] (g45.guest.molgen.mpg.de [141.14.220.45]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: pmenzel) by mx.molgen.mpg.de (Postfix) with ESMTPSA id D5DCE61E647BA; Tue, 28 Jan 2025 16:08:43 +0100 (CET) Message-ID: Date: Tue, 28 Jan 2025 16:08:43 +0100 Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Warnings `Could not retrieve perf counters (-19)` and `amd_pstate: the _CPC object is not present in SBIOS or ACPI disabled` (Dell PowerEdge R7625, AMD EPYC 9174F) From: Paul Menzel To: Gautham Ranjal Shenoy , Mario Limonciello , Ray Huang , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org Cc: linux-pm@vger.kernel.org, linux-acpi@vger.kernel.org, LKML References: <2b811df7-5278-4cfc-b8a0-7d6d72d3358d@molgen.mpg.de> <5dff1719-c4e9-4ebf-ae0b-73b9de98df05@amd.com> Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit [Cc: +x86 maintainers and ACPI list] Dear Linux folks, Am 28.01.25 um 11:49 schrieb Paul Menzel: > Thank you for your quick replies. Gautham, messages with HTML are > rejected by Linux kernel lists. > > > Am 28.01.25 um 04:51 schrieb Shenoy, Gautham Ranjal: > >> As Mario mentioned, you need to enable the CPPC option. Looking for >> some of the Dell PowerEdge documentation, there is an option called >> "Collaborative CPU Performance Control" (https://www.dell.com/support/manuals/en-in/poweredge-r730/r730_ompublication/system-profile-settings-details?guid=guid-2e9b46a1-71e3-4072-9d86-db648757f0e6&lang=en-us). >> >> [cid:fe57df8f-3d99-4ea0-8f6e-b0daae49bb0e] >> Can you please try enabling it ? > > You quoted the Dell PowerEdge R730. I couldn’t find it in the *Dell > PowerEdge R7625 Installation and Service Manual* [1], and also it’s not > listed in the iDRAC9 Web site (attached with added `.txt` extension to > trick the Linux list). The amd_pstate warning seems to be related to the perf counters warning Linux prints earlier: $ dmesg --level alert,crit,err,warn [ 2.666393] Spectre V2 : WARNING: Unprivileged eBPF is enabled with eIBRS on, data leaks possible via Spectre v2 BHB attacks! [ 8.109446] Could not retrieve perf counters (-19) [ 9.386551] scsi 0:0:4:0: set ignore_delay_remove for handle(0x0012) [ 9.487804] amd_pstate: the _CPC object is not present in SBIOS or ACPI disabled [ 14.726193] wmi_bus wmi_bus-PNP0C14:00: [Firmware Bug]: WQBC data block query control method not found x86 maintainers, the original report with the Linux logs attached is in the archive [3]. It looks like, there is something missing in the Dell firmware to enable the feature. The perf counters warning is from `amd_set_max_freq_ratio()` in `arch/x86/kernel/acpi/cppc.c`: ``` static void amd_set_max_freq_ratio(void) { struct cppc_perf_caps perf_caps; u64 numerator, nominal_perf; u64 perf_ratio; int rc; rc = cppc_get_perf_caps(0, &perf_caps); if (rc) { pr_warn("Could not retrieve perf counters (%d)\n", rc); return; } […] } ``` With include/uapi/asm-generic/errno-base.h:#define ENODEV 19 /* No such device */ this is returned by in `drivers/acpi/cppc_acpi.c`: ``` /** * cppc_get_perf_caps - Get a CPU's performance capabilities. * @cpunum: CPU from which to get capabilities info. * @perf_caps: ptr to cppc_perf_caps. See cppc_acpi.h * * Return: 0 for success with perf_caps populated else -ERRNO. */ int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps) { struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpunum); […] if (!cpc_desc) { pr_debug("No CPC descriptor for CPU:%d\n", cpunum); return -ENODEV; } […] } ``` Just for your information. Kind regards, Paul > PS: > >> -- >> >> Thanks and Regards >> >> Gautham. > > Only if you care: Your signature delimiter misses a space at the end [2]. > > > [1]: https://www.dell.com/support/manuals/de-de/poweredge-r7625/per7625_ism_pub/system-profile-settings?guid=guid-9f6b6652-4079-45e7-90f5-1c8feee08ec0&lang=en-us > [2]: https://en.wikipedia.org/wiki/Signature_block#Standard_delimiter [3]: https://lore.kernel.org/linux-pm/d09f52d8-e084-4875-9608-5b3db2554f3d@molgen.mpg.de/T/#t