From nobody Mon Feb 9 15:32:39 2026 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.14]) (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 598AF244684 for ; Wed, 21 May 2025 22:51:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.14 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747867874; cv=none; b=k0058eKWNN7GL5TPjntuTgsCZqcMn92GXOt6zlA15LLYnEHCiqHE+hIBz6g9prAr0o3ghHtQ4mzKzYDrWjsXs2IcAymlTonlmgF7jkDHXmOFxd25Ni/HHYtTSCUKthNapadWKEjXbMK/N7PI6owpP+QMenPfDKw4ddgrHjbJsCc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747867874; c=relaxed/simple; bh=uPQU9YRN+KUbwCcHdG0+C2skJzAiOOPQTYpRYK0gF6I=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=JyFdawh4HQ2lPoNVkJs94wRQ1T5/74oaLpsgmSHQATZNxtwv+EpcFuSgQtaemrfDAQKCcpDrQbyAmzr223WZXgJoVqZYQnTc1sDeUvnwVx2vmO5tWJTDrrSgjHZ9KYhy9Rur6aFmws53nncfjJqQNGA2DIDCyb70pWG+5jNz3+w= 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=YsYSXppo; arc=none smtp.client-ip=198.175.65.14 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="YsYSXppo" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1747867870; x=1779403870; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=uPQU9YRN+KUbwCcHdG0+C2skJzAiOOPQTYpRYK0gF6I=; b=YsYSXppoAvLwZo4UCeTotx3iIxzqmNFOtfJs7wETzQ6Qhwf9G3qVYrQd O4S33IrgOGB2ZNhWi+0kpm+vqiKyR11qhfzdBf9EbONe30HEX8ETo1y+y tRjPWN5QnBZsJqzroMXYdIVmfrceII2kOVg915TPCnDtt+ihSRAIztkTn fXP3wY0NAHpnlTt4OJdSqR0V35u+dfTZYXcRCoWGbyPHxlWt4zUup5fa+ lLTa92Bzo1JTp8UbmJt0agDbFq47K3Wan/VqIRxiOtrBCbi6f4hmPbMBr 7XaBMhtHkpDIwcB5BuMlTO5akj5XXmVYCz5b3wO68Wqys0KG9h8NzMz8A w==; X-CSE-ConnectionGUID: CO7AdfDOSlWltRlPC7wXXA== X-CSE-MsgGUID: 4+KkFto6SQWc+r+kLz6/MA== X-IronPort-AV: E=McAfee;i="6700,10204,11440"; a="53677814" X-IronPort-AV: E=Sophos;i="6.15,304,1739865600"; d="scan'208";a="53677814" Received: from fmviesa009.fm.intel.com ([10.60.135.149]) by orvoesa106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 May 2025 15:51:00 -0700 X-CSE-ConnectionGUID: Q1IRm/hiT1CboqPRR1ZSZg== X-CSE-MsgGUID: 75PdtZpKRKWDedYLqoTeFw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.15,304,1739865600"; d="scan'208";a="141352189" Received: from agluck-desk3.sc.intel.com ([172.25.103.51]) by fmviesa009-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 May 2025 15:50:59 -0700 From: Tony Luck To: Fenghua Yu , Reinette Chatre , Maciej Wieczor-Retman , Peter Newman , James Morse , Babu Moger , Drew Fustini , Dave Martin , Anil Keshavamurthy , Chen Yu Cc: x86@kernel.org, linux-kernel@vger.kernel.org, patches@lists.linux.dev, Tony Luck Subject: [PATCH v5 22/29] x86,fs/resctrl: Handle domain creation/deletion for RDT_RESOURCE_PERF_PKG Date: Wed, 21 May 2025 15:50:40 -0700 Message-ID: <20250521225049.132551-23-tony.luck@intel.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250521225049.132551-1-tony.luck@intel.com> References: <20250521225049.132551-1-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: quoted-printable Content-Type: text/plain; charset="utf-8" The L3 resource has several requirements for domains. There are structures that hold the 64-bit values of counters, and elements to keep track of the overflow and limbo threads. None of these are needed for the PERF_PKG resource. The hardware counters are wide enough that they do not wrap around for decades. Define a new rdt_perf_pkg_mon_domain structure which just consists of the standard rdt_domain_hdr to keep track of domain id and CPU mask. Change domain_add_cpu_mon(), domain_remove_cpu_mon(), resctrl_offline_mon_domain(), and resctrl_online_mon_domain() to check resource type and perform only the operations needed for domains in the PERF_PKG resource. Signed-off-by: Tony Luck --- arch/x86/kernel/cpu/resctrl/core.c | 41 ++++++++++++++++++++++++++++++ fs/resctrl/rdtgroup.c | 4 +++ 2 files changed, 45 insertions(+) diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resct= rl/core.c index 64ce561e77a0..18d84c497ee4 100644 --- a/arch/x86/kernel/cpu/resctrl/core.c +++ b/arch/x86/kernel/cpu/resctrl/core.c @@ -540,6 +540,38 @@ static void l3_mon_domain_setup(int cpu, int id, struc= t rdt_resource *r, struct } } =20 +/** + * struct rdt_perf_pkg_mon_domain - CPUs sharing an Intel-PMT-scoped resct= rl monitor resource + * @hdr: common header for different domain types + */ +struct rdt_perf_pkg_mon_domain { + struct rdt_domain_hdr hdr; +}; + +static void setup_intel_aet_mon_domain(int cpu, int id, struct rdt_resourc= e *r, + struct list_head *add_pos) +{ + struct rdt_perf_pkg_mon_domain *d; + int err; + + d =3D kzalloc_node(sizeof(*d), GFP_KERNEL, cpu_to_node(cpu)); + if (!d) + return; + + d->hdr.id =3D id; + d->hdr.type =3D RESCTRL_MON_DOMAIN; + d->hdr.rid =3D r->rid; + cpumask_set_cpu(cpu, &d->hdr.cpu_mask); + list_add_tail_rcu(&d->hdr.list, add_pos); + + err =3D resctrl_online_mon_domain(r, &d->hdr); + if (err) { + list_del_rcu(&d->hdr.list); + synchronize_rcu(); + kfree(d); + } +} + static void domain_add_cpu_mon(int cpu, struct rdt_resource *r) { int id =3D get_domain_id_from_scope(cpu, r->mon_scope); @@ -567,6 +599,9 @@ static void domain_add_cpu_mon(int cpu, struct rdt_reso= urce *r) case RDT_RESOURCE_L3: l3_mon_domain_setup(cpu, id, r, add_pos); break; + case RDT_RESOURCE_PERF_PKG: + setup_intel_aet_mon_domain(cpu, id, r, add_pos); + break; default: WARN_ON_ONCE(1); } @@ -666,6 +701,12 @@ static void domain_remove_cpu_mon(int cpu, struct rdt_= resource *r) default: pr_warn_once("Unknown resource rid=3D%d\n", r->rid); break; + case RDT_RESOURCE_PERF_PKG: + resctrl_offline_mon_domain(r, hdr); + list_del_rcu(&hdr->list); + synchronize_rcu(); + kfree(container_of(hdr, struct rdt_perf_pkg_mon_domain, hdr)); + break; } } =20 diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c index 1e1cc8001cbc..6078cdd5cad0 100644 --- a/fs/resctrl/rdtgroup.c +++ b/fs/resctrl/rdtgroup.c @@ -4170,6 +4170,8 @@ int resctrl_online_mon_domain(struct rdt_resource *r,= struct rdt_domain_hdr *hdr if (!domain_header_is_valid(hdr, RESCTRL_MON_DOMAIN, r->rid)) goto out_unlock; =20 + if (r->rid =3D=3D RDT_RESOURCE_PERF_PKG) + goto do_mkdir; d =3D container_of(hdr, struct rdt_l3_mon_domain, hdr); err =3D domain_setup_l3_mon_state(r, d); if (err) @@ -4184,6 +4186,8 @@ int resctrl_online_mon_domain(struct rdt_resource *r,= struct rdt_domain_hdr *hdr if (resctrl_is_mon_event_enabled(QOS_L3_OCCUP_EVENT_ID)) INIT_DELAYED_WORK(&d->cqm_limbo, cqm_handle_limbo); =20 +do_mkdir: + err =3D 0; /* * If the filesystem is not mounted then only the default resource group * exists. Creation of its directories is deferred until mount time --=20 2.49.0