From nobody Tue Dec 2 00:46:21 2025 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.11]) (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 970F8327207 for ; Mon, 24 Nov 2025 18:55:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.11 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764010512; cv=none; b=c0UDpo09mdnTy9+bY5eXFVEJoaVRPKbEuEAVu58kFACmmVpSsTmyRnIWf4heXlQnKHWkw2MVgIPasda35aEDbL9kT/X5jtWkRUW0RXu29l7la95sCF1YAz/G4Rudg+LAY3YUyEM/fGsDWHU0y0Jmn6kpdfhFWM7DimUOOuTD2D0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764010512; c=relaxed/simple; bh=UHRS0TLDoO64TMYWFggzrudAr8TGRSam3ri6R+Gk2Q4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=PWs51VroI2rTbFH2dGxpeF9FhMcg+YhpJlGgKQOwO68g5rInWJ7I0PkazMjRBAVSqwkSzi1oM6yhx2GMoOQn/O4WuVol9gd259rcc+NzmOh4a0GVheE7n0Nv9QqWmo9AnHPSByLjopMBg9r0XFK5z2V5UKdHCktIO0xPLSEEs7U= 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=MTCLRBLY; arc=none smtp.client-ip=192.198.163.11 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="MTCLRBLY" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1764010511; x=1795546511; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=UHRS0TLDoO64TMYWFggzrudAr8TGRSam3ri6R+Gk2Q4=; b=MTCLRBLYVIqyJtk74FsWY2CinF3Gyqm/3gHL440qsycgs2kvhPwjCks2 DfTpqEpE+9Dzs9GhOVoF1sTwffwtSWbvDKzqNXNfkr689UiF0Mk1afuwY 5VsUCyJCBjeeDkPjo+GfPJNNHOcfkvwBTNAKcOuLT0hqMKy5cF9wgCXIS I61mCgW1hRfSL0CH72X+KpZELDWExiiPWJHc4ozMK0o3FvWbe0TxPTzA9 bhV5zVDK8abV0XqpjlFNErRV4ghpRWACpDRGYNxQBvFGCuKCc71odwHH3 OkpPvDBEwUBdADuMIQLGriwMC/eJ7ltuLaPjkQLVeilK1uGVvbJW6RDgJ g==; X-CSE-ConnectionGUID: E/9zPcWHRbW/Gd6ltgSKvQ== X-CSE-MsgGUID: 9JIraqEDQcuaXb+7Wh8OFg== X-IronPort-AV: E=McAfee;i="6800,10657,11623"; a="76636885" X-IronPort-AV: E=Sophos;i="6.20,223,1758610800"; d="scan'208";a="76636885" Received: from orviesa009.jf.intel.com ([10.64.159.149]) by fmvoesa105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Nov 2025 10:54:31 -0800 X-CSE-ConnectionGUID: ELxfIMmDQCabBzqQO7WS8Q== X-CSE-MsgGUID: HxAshJb3SmW0jXb2RJhibg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.20,223,1758610800"; d="scan'208";a="192225032" Received: from rfrazer-mobl3.amr.corp.intel.com (HELO agluck-desk3.home.arpa) ([10.124.222.153]) by orviesa009-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Nov 2025 10:54:31 -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 v14 26/32] fs/resctrl: Move allocation/free of closid_num_dirty_rmid[] Date: Mon, 24 Nov 2025 10:54:03 -0800 Message-ID: <20251124185412.24155-27-tony.luck@intel.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251124185412.24155-1-tony.luck@intel.com> References: <20251124185412.24155-1-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 8c90a24ae0d0..55772aeec1a2 100644 --- a/fs/resctrl/monitor.c +++ b/fs/resctrl/monitor.c @@ -899,36 +899,14 @@ 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; } @@ -964,11 +942,6 @@ 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 @@ -1807,6 +1780,45 @@ 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. * @@ -1827,10 +1839,16 @@ 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", @@ -1873,5 +1891,10 @@ 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