From nobody Mon Feb 9 03:11:26 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id EFB0213A871 for ; Thu, 21 Mar 2024 16:51:58 +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=1711039920; cv=none; b=seZhxzDuH8nL+LX+Gab7APED1q9ZdujY4tPrXvu88KNkWzM90ikbcfdYi9P7BDFBBqHrt/TsJSjtIzHDJsmAYngZRf0Wtvo5w/K5UT4cPnTdYxiL2H79br8l2cndeiftKGIJCdvloMM5UzWor2gnRi8eYKtK/W21wXpz2nTXSlo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711039920; c=relaxed/simple; bh=o1zn+OQp7jij+/S14yaNK/v9gJcYPVyuhx5I/BBFRX0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=i43Vn8M2Zx7vxYkOX2jDhuzdgdBzvZMjzQJmRQ40kgCq+PAJVYNtwFDD07JKT4HElYbt+dZxWCFLXsj8nt+OvvNuSvICaV/DOVQXbAHlPAOtOKBh3c20WTbrD2eoKoXqgkCv0J6mI4fMC/hJ1vf4PEHHZto48CXo261WXgFDMSg= 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 DB50A1063; Thu, 21 Mar 2024 09:52:32 -0700 (PDT) Received: from merodach.members.linode.com (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 9C7B03F67D; Thu, 21 Mar 2024 09:51:55 -0700 (PDT) From: James Morse To: x86@kernel.org, linux-kernel@vger.kernel.org Cc: Fenghua Yu , 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 Subject: [PATCH v1 09/31] x86/resctrl: Add a resctrl helper to reset all the resources Date: Thu, 21 Mar 2024 16:50:44 +0000 Message-Id: <20240321165106.31602-10-james.morse@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20240321165106.31602-1-james.morse@arm.com> References: <20240321165106.31602-1-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" On umount(), resctrl resets each resource back to its default configuration. It only ever does this for all resources in one go. reset_all_ctrls() is architecture specific as it works with struct rdt_hw_resource. Add an architecture helper to reset all resources. Signed-off-by: James Morse --- arch/x86/include/asm/resctrl.h | 2 ++ arch/x86/kernel/cpu/resctrl/rdtgroup.c | 16 +++++++++++----- 2 files changed, 13 insertions(+), 5 deletions(-) diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h index f61382258743..5f6a5375bb4a 100644 --- a/arch/x86/include/asm/resctrl.h +++ b/arch/x86/include/asm/resctrl.h @@ -15,6 +15,8 @@ */ #define X86_RESCTRL_EMPTY_CLOSID ((u32)~0) =20 +void resctrl_arch_reset_resources(void); + /** * struct resctrl_pqr_state - State cache for the PQR MSR * @cur_rmid: The cached Resource Monitoring ID diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/r= esctrl/rdtgroup.c index 1a49c9918f8d..13c24cb18d76 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -2859,6 +2859,14 @@ static int reset_all_ctrls(struct rdt_resource *r) return 0; } =20 +void resctrl_arch_reset_resources(void) +{ + struct rdt_resource *r; + + for_each_capable_rdt_resource(r) + reset_all_ctrls(r); +} + /* * Move tasks from one to the other group. If @from is NULL, then all tasks * in the systems are moved unconditionally (used for teardown). @@ -2968,16 +2976,14 @@ static void rmdir_all_sub(void) =20 static void rdt_kill_sb(struct super_block *sb) { - struct rdt_resource *r; - cpus_read_lock(); mutex_lock(&rdtgroup_mutex); =20 rdt_disable_ctx(); =20 - /*Put everything back to default values. */ - for_each_alloc_capable_rdt_resource(r) - reset_all_ctrls(r); + /* Put everything back to default values. */ + resctrl_arch_reset_resources(); + rmdir_all_sub(); rdt_pseudo_lock_release(); rdtgroup_default.mode =3D RDT_MODE_SHAREABLE; --=20 2.39.2