From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.18]) (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 EC68D38F931 for ; Fri, 10 Apr 2026 20:05:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775851544; cv=none; b=nfMB3ZguWcawcJJCXc6IcaUzb/X3uuYf3tFESAfVzH+iA08fB/ApwHZk6WnSZYUphFcB7iJ8icyPaeqLi7tHFZ9xsMK0iWU+PEh9gKvjo+C9QcBYNM/m/8+9c6JF4v8lPdomGRQH0M26YIPhN5U+3Ano7eAqLaYfQaje/aK3QN4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775851544; c=relaxed/simple; bh=5Y+Hl8XUznNXOIiGmrYMs3h89O8MnhL1SwAGZMoxg1s=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=KdOjC7X7AtaJsINvVpRCNYA26mf4VPs7D7CKhERf33A1qqkPTZi3CNTH5hPq8yhT4BVB+xdReZnYNIFBSZJ3NHZGTdBIMIpP4Dv2JDZfv4VSLN3kEHxTLRwSR4Q+/AGU0uAjQglp7A1o2jQugktJoXoUEKQO68he8v4n1aY1OIA= 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=Edsqseky; arc=none smtp.client-ip=198.175.65.18 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="Edsqseky" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1775851542; x=1807387542; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=5Y+Hl8XUznNXOIiGmrYMs3h89O8MnhL1SwAGZMoxg1s=; b=EdsqsekymdPEJj7LFX8aM+e0zDcbeJYDxBSicYJyWZPLXp3wV21TdsbU BI/TmgVXIrv4s8dbmR22QZH3ubEq7H/QxiGr5J1vjeBbpMOl73IdHnR06 k7RAVH1e3ZZ1E2/RcuVArVZKJT1byoXZfBsGlSxcltMtqznptAj6ayosO yIhUIdNee6Lqm02RLq/LYyDwPXN4UMnrptAcPRNWeCDMTgMo5Ln2xjlS+ VsZJtyzD0nBamqzJ8euh6h0jJxXhyXIuR2ystcMFYZT/WKAtzIcLVOhAT Mli+BHbIb3rTTAMmbARp1QlT5S6RWzV0FrX/7Uh27tiXTu3b/RN8vuRSD A==; X-CSE-ConnectionGUID: +JmOUEYfQRWKAtbMJ7ZgoA== X-CSE-MsgGUID: 7pbPptvpRSCpQZD661DObQ== X-IronPort-AV: E=McAfee;i="6800,10657,11755"; a="76898080" X-IronPort-AV: E=Sophos;i="6.23,172,1770624000"; d="scan'208";a="76898080" Received: from orviesa006.jf.intel.com ([10.64.159.146]) by orvoesa110.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Apr 2026 13:05:40 -0700 X-CSE-ConnectionGUID: RH4q9cwOR7STZ+ICBVlgIQ== X-CSE-MsgGUID: eYyWKV9SRk61n51Fu4KZgA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,172,1770624000"; d="scan'208";a="228155012" Received: from khuang2-desk.gar.corp.intel.com (HELO agluck-desk3.intel.com) ([10.124.221.106]) by orviesa006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Apr 2026 13:05:39 -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: [RFC PATCH v5 3/7] x86/resctrl: x86/resctrl: Add PMT registration API for AET enumeration callbacks Date: Fri, 10 Apr 2026 13:05:28 -0700 Message-ID: <20260410200532.58602-4-tony.luck@intel.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260410200532.58602-1-tony.luck@intel.com> References: <20260410200532.58602-1-tony.luck@intel.com> Precedence: bulk X-Mailing-List: patches@lists.linux.dev 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 575f8408a9e7..b5fa54c4637c 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