From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.12]) (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 3A397377ED7 for ; Wed, 29 Apr 2026 18:49:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.12 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777488563; cv=none; b=jhJzHCczezr5oeJF7pG6yJJUO+0CsJE1tEsqsvBJ6mW0lYLrjDMVIQ29WMbgjcC4hffW/VPJKz56Ww7HJIZ3PnX7gE6ICIuxR5ITjqwLJ+vgjZfK3rZCYpawlbb2DULm153xhEHrROnwH+ezk4J192HwKvtfbDZCyxIQPAtamdM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777488563; c=relaxed/simple; bh=rLOc77ldRdvLglDGNCsB9ndiaT8ZnPgCqg2WC/lIc0w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=JLDQY+ZT5GQXETFyh0VUHSKNQdktRRsxYUXg1Jga5NFF26f0mlRXUsd6nfjAf/OlVqtHSMsOCwhAiOHXHBoYZ1TLWKpjt0V+WTPap+w/WbBugHBF9rR8DntHtHqgYUDPTtbVcSjQYjBu8jHBeWGT+ljJFfaLnYFFGSO552mhopo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=ilUscmQl; arc=none smtp.client-ip=198.175.65.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="ilUscmQl" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1777488558; x=1809024558; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=rLOc77ldRdvLglDGNCsB9ndiaT8ZnPgCqg2WC/lIc0w=; b=ilUscmQlZeHxHdVFGpnno8Um09NApTFH7rjA7ZxKYHZPWM/DEYDulNxC pOQD5piKoyKa7Te372cUA9xba8LSSuV8ZegeYShHwCwPcMMFC1E0UOIIA 971g46GEarFwt+aIlTbz5zlr0DPMVx8qLXcEdov9uVGHnmZeek/S1OkfG 0hE5ZMeTzbBmsphARTFZYtdJ6+UiAmgX2kA1Gre/LIaqq8LaKRh2ipDgc eMcdYXeulH5/Ehyst46JanDfTnisbHdSdRBsPZeBz1Q1MVlWn9W814Z41 ihAO3MhchvG2BhY/TtuIYqcGOPWHMMM1dzg3JJMCJUoUJVpE2exk23oxU w==; X-CSE-ConnectionGUID: QgZNdRXFSQuNo9eTa1U+7w== X-CSE-MsgGUID: YFMSUKfrSBOBc/8MTadQ0g== X-IronPort-AV: E=McAfee;i="6800,10657,11771"; a="89890721" X-IronPort-AV: E=Sophos;i="6.23,206,1770624000"; d="scan'208";a="89890721" Received: from orviesa003.jf.intel.com ([10.64.159.143]) by orvoesa104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Apr 2026 11:49:07 -0700 X-CSE-ConnectionGUID: ZnOoNTSWRNmglTbLjBW6xQ== X-CSE-MsgGUID: xUIhFUB7Sce2NHHU8EdMWQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,206,1770624000"; d="scan'208";a="238323014" Received: from mjruhl-desk.amr.corp.intel.com (HELO agluck-desk3.home.arpa) ([10.124.222.13]) by ORVIESA003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Apr 2026 11:49:07 -0700 From: Tony Luck To: Fenghua Yu , Reinette Chatre , Maciej Wieczor-Retman , Peter Newman , James Morse , Babu Moger , Drew Fustini , Dave Martin , Chen Yu , David E Box , x86@kernel.org Cc: Christoph Hellwig , linux-kernel@vger.kernel.org, patches@lists.linux.dev, Tony Luck Subject: [PATCH v6 05/10] x86/resctrl: x86/resctrl: Add PMT registration API for AET enumeration callbacks Date: Wed, 29 Apr 2026 11:48:53 -0700 Message-ID: <20260429184858.36423-6-tony.luck@intel.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260429184858.36423-1-tony.luck@intel.com> References: <20260429184858.36423-1-tony.luck@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit resctrl is always built-in; INTEL_PMT_TELEMETRY may be a module. Add, and export, register/unregister functions so the PMT module can supply/clear enumeration callback functions when loaded/unloaded. Suggested-by: Christoph Hellwig Signed-off-by: Tony Luck --- arch/x86/include/asm/resctrl.h | 19 ++++++++++++++ arch/x86/kernel/cpu/resctrl/intel_aet.c | 35 +++++++++++++++++++++++++ 2 files changed, 54 insertions(+) diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h index 1e50c7dc3fe3..7c929b72098c 100644 --- a/arch/x86/include/asm/resctrl.h +++ b/arch/x86/include/asm/resctrl.h @@ -4,6 +4,8 @@ #ifdef CONFIG_X86_CPU_RESCTRL +#include +#include #include #include #include @@ -193,11 +195,28 @@ static inline void resctrl_arch_mon_ctx_free(struct rdt_resource *r, void resctrl_cpu_detect(struct cpuinfo_x86 *c); +#ifdef CONFIG_X86_CPU_RESCTRL_INTEL_AET +void intel_aet_register_enumeration(struct pmt_feature_group *(*get)(enum pmt_feature_id id), + void (*put)(struct pmt_feature_group *p)); +void intel_aet_unregister_enumeration(void); #else +static inline void intel_aet_register_enumeration(struct pmt_feature_group *(*get)(enum pmt_feature_id id), + void (*put)(struct pmt_feature_group *p)) { } +static inline void intel_aet_unregister_enumeration(void) { } +#endif /* CONFIG_X86_CPU_RESCTRL_INTEL_AET */ + +#else + +#include +#include static inline void resctrl_arch_sched_in(struct task_struct *tsk) {} static inline void resctrl_cpu_detect(struct cpuinfo_x86 *c) {} +static inline void intel_aet_register_enumeration(struct pmt_feature_group *(*get)(enum pmt_feature_id id), + void (*put)(struct pmt_feature_group *p)) { } +static inline void intel_aet_unregister_enumeration(void) { } + #endif /* CONFIG_X86_CPU_RESCTRL */ #endif /* _ASM_X86_RESCTRL_H */ diff --git a/arch/x86/kernel/cpu/resctrl/intel_aet.c b/arch/x86/kernel/cpu/resctrl/intel_aet.c index e2af700bca04..2b3677783427 100644 --- a/arch/x86/kernel/cpu/resctrl/intel_aet.c +++ b/arch/x86/kernel/cpu/resctrl/intel_aet.c @@ -12,17 +12,21 @@ #define pr_fmt(fmt) "resctrl: " fmt #include +#include #include #include #include #include #include +#include #include #include #include #include #include #include +#include +#include #include #include #include @@ -289,6 +293,9 @@ static enum pmt_feature_id lookup_pfid(const char *pfname) return FEATURE_INVALID; } +static struct pmt_feature_group *(*get_feature)(enum pmt_feature_id id); +static void (*put_feature)(struct pmt_feature_group *p); + /* * Request a copy of struct pmt_feature_group for each event group. If there is * one, the returned structure has an array of telemetry_region structures, @@ -323,6 +330,25 @@ bool intel_aet_get_events(void) return ret; } +static DEFINE_MUTEX(aet_register_lock); + +void intel_aet_register_enumeration(struct pmt_feature_group *(*get)(enum pmt_feature_id id), + void (*put)(struct pmt_feature_group *p)) +{ + guard(mutex)(&aet_register_lock); + get_feature = get; + put_feature = put; +} +EXPORT_SYMBOL_GPL(intel_aet_register_enumeration); + +void intel_aet_unregister_enumeration(void) +{ + guard(mutex)(&aet_register_lock); + get_feature = NULL; + put_feature = NULL; +} +EXPORT_SYMBOL_GPL(intel_aet_unregister_enumeration); + void __exit intel_aet_exit(void) { struct event_group **peg; @@ -405,3 +431,12 @@ void intel_aet_mon_domain_setup(int cpu, int id, struct rdt_resource *r, kfree(d); } } + +static int __init intel_aet_init(void) +{ + request_module("pmt_telemetry"); + + return 0; +} + +late_initcall(intel_aet_init); -- 2.53.0