From nobody Mon Dec 15 22:06:11 2025 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.13]) (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 50A0D3064B7 for ; Wed, 10 Dec 2025 23:15:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.13 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765408529; cv=none; b=h7h7bv/5L10+1ackucjWtAH1nC2VBMistHGblJT1XhnMZSCbnugcqNGPozVhZvuvfBYwmZF4pHWGppiC+Zw30qooA/bdKL86dfSnpaoD157tVgx5gl1U2cN/qNSzaC3rXm9rXwm34dC22OSqx346H7CudfKdRw+0dnq447L3pM0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765408529; c=relaxed/simple; bh=CGFEj4tvfooKXhbfegsNmka6gSziOv51Ou9GZK5vcwI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=FG6DKl0q+qzo9je7g6+Ixxv25u+ttSeMXPYG7vkEseg1eNkzQhs7vPUyToJhXQpOAX2OlZf0NgIbZ98qU8kJ2dmamITUggD8pmrLq7mpmtvIRjJ98S6sB115otmsiZz2eVF0tw41Sw2/NRYC1PS3+VGQjvgNSQkloZ9Q9O7aY6k= 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=ZdDq8XT9; arc=none smtp.client-ip=192.198.163.13 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="ZdDq8XT9" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1765408518; x=1796944518; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=CGFEj4tvfooKXhbfegsNmka6gSziOv51Ou9GZK5vcwI=; b=ZdDq8XT9TZUyDOCYuZX9R6kX5rSeue8lELAMmkVijNT8pZKw455QaVX4 qpMwmbjyGr+pq/tHIIKefkAYVNAw3aIc7SlkZ7qBndCT4gFsXiKuSNTrU feAx3/j5C5sSCBfr6gZuqZ/aGXJJe6554WM55bUDtRjmd1WZ54H7AtuRU foJG09r3+tv6ki2eVGyhWrPgOfFsEi69wGzRfZS8Km7JPMnf6Caic8FCw P9jtvBWanOsYyAgN8d+++qdYidzXogp6X7zt11nMi/+GjLvrGe8LMaAx+ FOqKLd9RUapT0AeVQQB0gxxcYUCbigkP1wG7hYczD2EXUQRSLS5SvhGKd g==; X-CSE-ConnectionGUID: jtZ3HN9PSoC5gz7pzJ56oQ== X-CSE-MsgGUID: 3CjPN8rlQ1OYMcWUDj6EfA== X-IronPort-AV: E=McAfee;i="6800,10657,11638"; a="69973689" X-IronPort-AV: E=Sophos;i="6.20,265,1758610800"; d="scan'208";a="69973689" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by fmvoesa107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Dec 2025 15:14:42 -0800 X-CSE-ConnectionGUID: lq6VEEjjTrqjOudrPjJN4g== X-CSE-MsgGUID: OHKHhwzjT7euxFd0b1xWGQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.20,265,1758610800"; d="scan'208";a="227297138" Received: from daliomra-mobl3.amr.corp.intel.com (HELO agluck-desk3.intel.com) ([10.124.221.254]) by orviesa002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Dec 2025 15:14:41 -0800 From: Tony Luck To: Fenghua Yu , Reinette Chatre , Maciej Wieczor-Retman , Peter Newman , James Morse , Babu Moger , Drew Fustini , Dave Martin , Chen Yu Cc: x86@kernel.org, linux-kernel@vger.kernel.org, patches@lists.linux.dev, Tony Luck Subject: [PATCH v16 26/32] fs/resctrl: Move allocation/free of closid_num_dirty_rmid[] Date: Wed, 10 Dec 2025 15:14:05 -0800 Message-ID: <20251210231413.59102-27-tony.luck@intel.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251210231413.59102-1-tony.luck@intel.com> References: <20251210231413.59102-1-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" closid_num_dirty_rmid[] and rmid_ptrs[] are allocated together during resct= rl initialization and freed together during resctrl exit. Telemetry events are enumerated on resctrl mount so only at resctrl mount will the number of RMID supported by all monitoring resources and needed as size for rmid_ptrs[] be known. Separate closid_num_dirty_rmid[] and rmid_ptrs[] allocation and free in preparation for rmid_ptrs[] to be allocated on resctrl mount. Keep the rdtgroup_mutex protection around the allocation and free of closid_num_dirty_rmid[] as ARM needs this to guarantee memory ordering. Signed-off-by: Tony Luck Reviewed-by: Reinette Chatre --- fs/resctrl/monitor.c | 79 ++++++++++++++++++++++++++++---------------- 1 file changed, 51 insertions(+), 28 deletions(-) diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c index 8a4c2ae72740..bbf8c9037887 100644 --- a/fs/resctrl/monitor.c +++ b/fs/resctrl/monitor.c @@ -906,36 +906,14 @@ void mbm_setup_overflow_handler(struct rdt_l3_mon_dom= ain *dom, unsigned long del static int dom_data_init(struct rdt_resource *r) { u32 idx_limit =3D resctrl_arch_system_num_rmid_idx(); - u32 num_closid =3D resctrl_arch_get_num_closid(r); struct rmid_entry *entry =3D NULL; int err =3D 0, i; u32 idx; =20 mutex_lock(&rdtgroup_mutex); - if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) { - u32 *tmp; - - /* - * If the architecture hasn't provided a sanitised value here, - * this may result in larger arrays than necessary. Resctrl will - * use a smaller system wide value based on the resources in - * use. - */ - tmp =3D kcalloc(num_closid, sizeof(*tmp), GFP_KERNEL); - if (!tmp) { - err =3D -ENOMEM; - goto out_unlock; - } - - closid_num_dirty_rmid =3D tmp; - } =20 rmid_ptrs =3D kcalloc(idx_limit, sizeof(struct rmid_entry), GFP_KERNEL); if (!rmid_ptrs) { - if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) { - kfree(closid_num_dirty_rmid); - closid_num_dirty_rmid =3D NULL; - } err =3D -ENOMEM; goto out_unlock; } @@ -971,11 +949,6 @@ static void dom_data_exit(struct rdt_resource *r) if (!r->mon_capable) goto out_unlock; =20 - if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) { - kfree(closid_num_dirty_rmid); - closid_num_dirty_rmid =3D NULL; - } - kfree(rmid_ptrs); rmid_ptrs =3D NULL; =20 @@ -1814,6 +1787,45 @@ ssize_t mbm_L3_assignments_write(struct kernfs_open_= file *of, char *buf, return ret ?: nbytes; } =20 +static int closid_num_dirty_rmid_alloc(struct rdt_resource *r) +{ + if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) { + u32 num_closid =3D resctrl_arch_get_num_closid(r); + u32 *tmp; + + /* For ARM memory ordering access to closid_num_dirty_rmid */ + mutex_lock(&rdtgroup_mutex); + + /* + * If the architecture hasn't provided a sanitised value here, + * this may result in larger arrays than necessary. Resctrl will + * use a smaller system wide value based on the resources in + * use. + */ + tmp =3D kcalloc(num_closid, sizeof(*tmp), GFP_KERNEL); + if (!tmp) { + mutex_unlock(&rdtgroup_mutex); + return -ENOMEM; + } + + closid_num_dirty_rmid =3D tmp; + + mutex_unlock(&rdtgroup_mutex); + } + + return 0; +} + +static void closid_num_dirty_rmid_free(void) +{ + if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) { + mutex_lock(&rdtgroup_mutex); + kfree(closid_num_dirty_rmid); + closid_num_dirty_rmid =3D NULL; + mutex_unlock(&rdtgroup_mutex); + } +} + /** * resctrl_l3_mon_resource_init() - Initialise global monitoring structure= s. * @@ -1834,10 +1846,16 @@ int resctrl_l3_mon_resource_init(void) if (!r->mon_capable) return 0; =20 - ret =3D dom_data_init(r); + ret =3D closid_num_dirty_rmid_alloc(r); if (ret) return ret; =20 + ret =3D dom_data_init(r); + if (ret) { + closid_num_dirty_rmid_free(); + return ret; + } + if (resctrl_arch_is_evt_configurable(QOS_L3_MBM_TOTAL_EVENT_ID)) { mon_event_all[QOS_L3_MBM_TOTAL_EVENT_ID].configurable =3D true; resctrl_file_fflags_init("mbm_total_bytes_config", @@ -1880,5 +1898,10 @@ void resctrl_l3_mon_resource_exit(void) { struct rdt_resource *r =3D resctrl_arch_get_resource(RDT_RESOURCE_L3); =20 + if (!r->mon_capable) + return; + + closid_num_dirty_rmid_free(); + dom_data_exit(r); } --=20 2.51.1