From nobody Tue Dec 16 13:24:16 2025 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 0AB672882AF for ; Thu, 8 May 2025 17:19:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746724792; cv=none; b=YOHxP65wzh3yqWQAcm85w1Lqw7rEp1SxfxUAjU5rthOayfCI4yR6eIbk0d7IoC87KL1NTaYguhIR9FmYzEffjzbeDi4hXK6mSQ0iFBjU+hBKv13i2Wxkc+n2mk4KXsnWTX979WzubSkQknbxJPP3fO+6G2CoKW8dhAbaNZxD+U8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746724792; c=relaxed/simple; bh=wM93TKavCy8WnEb1Cs3W1D0G4nMV8eSj3VBX4Z2D+d4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=FwesxpmU3bST/aK7x96SE0Grbian+0ks6wie/7E6+1GAwO36T7z859Ko81v+kVFvrz/XNUgSwJsnZz97yKYbEZrfYgV0OhPLcJMJ63N4ul9AT8l//MRRdDLbLTnjtZOcbtUa8JcH7vLyaE4KG9DaKRePQu1P2vDaGKngl/4WCMA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 22AD62437; Thu, 8 May 2025 10:19:39 -0700 (PDT) Received: from merodach.members.linode.com (usa-sjc-mx-foss1.foss.arm.com [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 289053F58B; Thu, 8 May 2025 10:19:46 -0700 (PDT) From: James Morse To: x86@kernel.org, linux-kernel@vger.kernel.org Cc: Reinette Chatre , Thomas Gleixner , Ingo Molnar , Borislav Petkov , H Peter Anvin , Babu Moger , James Morse , shameerali.kolothum.thodi@huawei.com, D Scott Phillips OS , carl@os.amperecomputing.com, lcherian@marvell.com, bobo.shaobowang@huawei.com, tan.shaopeng@fujitsu.com, baolin.wang@linux.alibaba.com, Jamie Iles , Xin Hao , peternewman@google.com, dfustini@baylibre.com, amitsinght@marvell.com, David Hildenbrand , Rex Nie , Dave Martin , Koba Ko , Shanker Donthineni , fenghuay@nvidia.com, Shaopeng Tan , Babu Moger , Tony Luck Subject: [PATCH v10 08/30] x86/resctrl: resctrl_exit() teardown resctrl but leave the mount point Date: Thu, 8 May 2025 17:18:36 +0000 Message-Id: <20250508171858.9197-9-james.morse@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20250508171858.9197-1-james.morse@arm.com> References: <20250508171858.9197-1-james.morse@arm.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" resctrl_exit() was intended for use when the 'resctrl' module was unloaded. resctrl can't be built as a module, and the kernfs helpers are not exported so this is unlikely to change. MPAM has an error interrupt which indicates the MPAM driver has gone haywire. Should this occur tasks could run with the wrong control values, leading to bad performance for important tasks. In this scenario the MPAM driver will reset the hardware, but it needs a way to tell resctrl that no further configuration should be attempted. In particular, moving tasks between control or monitor groups does not interact with the architecture code, so there is no opportunity for the arch code to indicate that the hardware is no-longer functioning. Using resctrl_exit() for this leaves the system in a funny state as resctrl is still mounted, but cannot be un-mounted because the sysfs directory that is typically used has been removed. Dave Martin suggests this may cause systemd trouble in the future as not all filesystems can be unmounted. Add calls to remove all the files and directories in resctrl, and remove the sysfs_remove_mount_point() call that leaves the system in a funny state. When triggered, this causes all the resctrl files to disappear. resctrl can be unmounted, but not mounted again. Signed-off-by: James Morse Tested-by: Carl Worth # arm64 Tested-by: Shaopeng Tan Tested-by: Peter Newman Tested-by: Amit Singh Tomar # arm64 Tested-by: Shanker Donthineni # arm64 Tested-by: Babu Moger Reviewed-by: Shaopeng Tan Reviewed-by: Tony Luck Reviewed-by: Reinette Chatre --- Changes since v9: * Removed 'this function' from a comment, added the missing word 'errno'. Changes since v8: * Call resctrl_fs_teardown() under cpuhp lock, for good measure. * Set debugfs_resctrl to NULL to be robust against a second call. * Added more documentation commentary. * Moved some words around to change the tone. Changes since v7: * Moved kernfs cleanup functions to resctrl_fs_teardown(), and call this from rescrl_exit(). * Added description of MPAM resetting the hardware to the commit message. Changes since v6: * Added kdoc and comment to resctrl_exit(). Changes since v5: * Serialise rdtgroup_destroy_root() against umount(). * Check rdtgroup_default.kn to protect against duplicate calls. --- arch/x86/kernel/cpu/resctrl/rdtgroup.c | 48 +++++++++++++++++++++----- 1 file changed, 40 insertions(+), 8 deletions(-) diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/r= esctrl/rdtgroup.c index f617ac97758b..699d0cde12c4 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -3078,6 +3078,22 @@ static void rmdir_all_sub(void) kernfs_remove(kn_mondata); } =20 +static void resctrl_fs_teardown(void) +{ + lockdep_assert_held(&rdtgroup_mutex); + + /* Cleared by rdtgroup_destroy_root() */ + if (!rdtgroup_default.kn) + return; + + rmdir_all_sub(); + rdt_pseudo_lock_release(); + rdtgroup_default.mode =3D RDT_MODE_SHAREABLE; + closid_exit(); + schemata_list_destroy(); + rdtgroup_destroy_root(); +} + static void rdt_kill_sb(struct super_block *sb) { struct rdt_resource *r; @@ -3091,12 +3107,7 @@ static void rdt_kill_sb(struct super_block *sb) for_each_alloc_capable_rdt_resource(r) resctrl_arch_reset_all_ctrls(r); =20 - rmdir_all_sub(); - rdt_pseudo_lock_release(); - rdtgroup_default.mode =3D RDT_MODE_SHAREABLE; - closid_exit(); - schemata_list_destroy(); - rdtgroup_destroy_root(); + resctrl_fs_teardown(); if (resctrl_arch_alloc_capable()) resctrl_arch_disable_alloc(); if (resctrl_arch_mon_capable()) @@ -4127,6 +4138,8 @@ static int rdtgroup_setup_root(struct rdt_fs_context = *ctx) =20 static void rdtgroup_destroy_root(void) { + lockdep_assert_held(&rdtgroup_mutex); + kernfs_destroy_root(rdt_root); rdtgroup_default.kn =3D NULL; } @@ -4432,23 +4445,42 @@ static bool __exit resctrl_online_domains_exist(voi= d) return false; } =20 -/* +/** * resctrl_exit() - Remove the resctrl filesystem and free resources. * + * Called by the architecture code in response to a fatal error. + * Removes resctrl files and structures from kernfs to prevent further + * configuration. + * * When called by the architecture code, all CPUs and resctrl domains must= be * offline. This ensures the limbo and overflow handlers are not scheduled= to * run, meaning the data structures they access can be freed by * resctrl_mon_resource_exit(). + * + * After resctrl_exit() returns, the architecture code should return an + * error from all resctrl_arch_ functions that can do this. + * resctrl_arch_get_resource() must continue to return struct rdt_resources + * with the correct rid field to ensure the filesystem can be unmounted. */ void __exit resctrl_exit(void) { cpus_read_lock(); WARN_ON_ONCE(resctrl_online_domains_exist()); + + mutex_lock(&rdtgroup_mutex); + resctrl_fs_teardown(); + mutex_unlock(&rdtgroup_mutex); + cpus_read_unlock(); =20 debugfs_remove_recursive(debugfs_resctrl); + debugfs_resctrl =3D NULL; unregister_filesystem(&rdt_fs_type); - sysfs_remove_mount_point(fs_kobj, "resctrl"); + + /* + * Do not remove the sysfs mount point added by resctrl_init() so that + * it can be used to umount resctrl. + */ =20 resctrl_mon_resource_exit(); } --=20 2.39.5