From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.21]) (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 2120A373BE0 for ; Mon, 1 Jun 2026 19:56:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.21 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780343816; cv=none; b=eNY6/KcQpiZSKwO0nNMc/jCYNxTmqpQhmSeLJbUIIFq7t5x4sjAfUfushnRI3O6f+zrxf8GDJt+uGxg2Y2vY6sq3E9Aj8uFc8VT2aQgcaSiRvEU5fAeHjO5SB1gJkEudFn3Qyyp6+nAOjNcE1Oa0MZ4QCas6wSmYWkX5jzJr/Ho= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780343816; c=relaxed/simple; bh=OSgWP4UuE9mXdfXnJ5+20fMkWBkqKVlxn+C7zA/elbE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HQxt7IH1qfY/3T4zbbnxZVSDL8ZTiWhUBPucHp7bRg0wXk2JZ1UeSGJRicswn2M9tinDItoCLNdiJ9Bn3uKVOZ8ejaLmMKEySl6zXeHzQNfEsxUWOhqwJEv6ueV71NJkWnQgE3YxVCXwOfBuTTn+WTO9XGW7Ji82lJ/SEhHOZA4= 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=UICCwfnO; arc=none smtp.client-ip=198.175.65.21 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="UICCwfnO" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1780343815; x=1811879815; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=OSgWP4UuE9mXdfXnJ5+20fMkWBkqKVlxn+C7zA/elbE=; b=UICCwfnOM0v2k5DGhzWE9ZwFdRDoooLmFpjvbflutUXMbIvwxDDhKczt 6fnpweJVHgxqyuQRa3wzopfJef6FP5FBzc1xYTRZzlma98fsJZrT60VKx qcaiJTb2fsmkAyNvetWJpdrgcfAsMXR2+/NH8Cc/dDxpg8lK9mpBmmjZS NWTmTriBvyAfDOttxPkrea3T/zTaBPwIxbEUu9J6yz0zx731IueiODDYa qT1/5gOkyKxjVRGd3xcNX3EYjMTaPgo6XOUfy3Oh2N0BR2TW0dsSHVax+ IOoLKagAg6AXdReN3pUdg8hlwOP/dAyirOuxaZ54yShn8ZHhpmSAEc7/1 A==; X-CSE-ConnectionGUID: NGg9cHtxRWKD360kYwyvkg== X-CSE-MsgGUID: fEUNqas7RjSyQV2BUwr+3w== X-IronPort-AV: E=McAfee;i="6800,10657,11804"; a="81011633" X-IronPort-AV: E=Sophos;i="6.24,181,1774335600"; d="scan'208";a="81011633" Received: from orviesa004.jf.intel.com ([10.64.159.144]) by orvoesa113.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Jun 2026 12:56:44 -0700 X-CSE-ConnectionGUID: i4ZnBhQ+TkioMETWFmVQRA== X-CSE-MsgGUID: qx6SYmdnQoyQDdFazmfhBA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.24,181,1774335600"; d="scan'208";a="247946519" Received: from lstrano-mobl6.amr.corp.intel.com (HELO agluck-desk3.home.arpa) ([10.124.221.168]) by orviesa004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Jun 2026 12:56:42 -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 v7 09/14] x86/resctrl: Add PMT registration API for AET enumeration callbacks Date: Mon, 1 Jun 2026 12:56:27 -0700 Message-ID: <20260601195632.15876-10-tony.luck@intel.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260601195632.15876-1-tony.luck@intel.com> References: <20260601195632.15876-1-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 | 22 ++++++++++++++++++ arch/x86/kernel/cpu/resctrl/intel_aet.c | 30 +++++++++++++++++++++++++ 2 files changed, 52 insertions(+) diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h index 1e50c7dc3fe3..c23d9c56a337 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 +195,31 @@ 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 module *module, + 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 module *module, + 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 module *module, + 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..db671725acbb 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 +293,10 @@ static enum pmt_feature_id lookup_pfid(const char *pfname) return FEATURE_INVALID; } +static struct module *pmt_module; +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 +331,28 @@ bool intel_aet_get_events(void) return ret; } +static DEFINE_MUTEX(aet_register_lock); + +void intel_aet_register_enumeration(struct module *module, + 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; + pmt_module = module; +} +EXPORT_SYMBOL_NS_GPL(intel_aet_register_enumeration, "INTEL_PMT"); + +void intel_aet_unregister_enumeration(void) +{ + guard(mutex)(&aet_register_lock); + pmt_module = NULL; + get_feature = NULL; + put_feature = NULL; +} +EXPORT_SYMBOL_NS_GPL(intel_aet_unregister_enumeration, "INTEL_PMT"); + void __exit intel_aet_exit(void) { struct event_group **peg; -- 2.54.0