From nobody Sat Dec 27 20:53:40 2025 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 6ED9D3FB28 for ; Fri, 15 Dec 2023 17:44:12 +0000 (UTC) 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 0E4F3C15; Fri, 15 Dec 2023 09:44:57 -0800 (PST) Received: from merodach.members.linode.com (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id F06623F5A1; Fri, 15 Dec 2023 09:44:08 -0800 (PST) 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, Babu Moger , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= Subject: [PATCH v8 03/24] x86/resctrl: Create helper for RMID allocation and mondata dir creation Date: Fri, 15 Dec 2023 17:43:22 +0000 Message-Id: <20231215174343.13872-4-james.morse@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20231215174343.13872-1-james.morse@arm.com> References: <20231215174343.13872-1-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-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable When monitoring is supported, each monitor and control group is allocated an RMID. For control groups, rdtgroup_mkdir_ctrl_mon() later goes on to allocate the CLOSID. MPAM's equivalent of RMID are not an independent number, so can't be allocated until the CLOSID is known. An RMID allocation for one CLOSID may fail, whereas another may succeed depending on how many monitor groups a control group has. The RMID allocation needs to move to be after the CLOSID has been allocated. Move the RMID allocation and mondata dir creation to a helper. Signed-off-by: James Morse Tested-by: Peter Newman Tested-by: Shaopeng Tan Tested-by: Babu Moger Reviewed-by: Shaopeng Tan Reviewed-by: Ilpo J=C3=A4rvinen Reviewed-by: Reinette Chatre Reviewed-by: Babu Moger --- Changes since v4: * Fixed typo in commit message, moved some words around. --- arch/x86/kernel/cpu/resctrl/rdtgroup.c | 42 +++++++++++++++++--------- 1 file changed, 27 insertions(+), 15 deletions(-) diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/r= esctrl/rdtgroup.c index 69a1de92384a..1eb3a3075093 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -3293,6 +3293,30 @@ static int rdtgroup_init_alloc(struct rdtgroup *rdtg= rp) return ret; } =20 +static int mkdir_rdt_prepare_rmid_alloc(struct rdtgroup *rdtgrp) +{ + int ret; + + if (!rdt_mon_capable) + return 0; + + ret =3D alloc_rmid(); + if (ret < 0) { + rdt_last_cmd_puts("Out of RMIDs\n"); + return ret; + } + rdtgrp->mon.rmid =3D ret; + + ret =3D mkdir_mondata_all(rdtgrp->kn, rdtgrp, &rdtgrp->mon.mon_data_kn); + if (ret) { + rdt_last_cmd_puts("kernfs subdir error\n"); + free_rmid(rdtgrp->mon.rmid); + return ret; + } + + return 0; +} + static int mkdir_rdt_prepare(struct kernfs_node *parent_kn, const char *name, umode_t mode, enum rdt_group_type rtype, struct rdtgroup **r) @@ -3365,20 +3389,10 @@ static int mkdir_rdt_prepare(struct kernfs_node *pa= rent_kn, goto out_destroy; } =20 - if (rdt_mon_capable) { - ret =3D alloc_rmid(); - if (ret < 0) { - rdt_last_cmd_puts("Out of RMIDs\n"); - goto out_destroy; - } - rdtgrp->mon.rmid =3D ret; + ret =3D mkdir_rdt_prepare_rmid_alloc(rdtgrp); + if (ret) + goto out_destroy; =20 - ret =3D mkdir_mondata_all(kn, rdtgrp, &rdtgrp->mon.mon_data_kn); - if (ret) { - rdt_last_cmd_puts("kernfs subdir error\n"); - goto out_idfree; - } - } kernfs_activate(kn); =20 /* @@ -3386,8 +3400,6 @@ static int mkdir_rdt_prepare(struct kernfs_node *pare= nt_kn, */ return 0; =20 -out_idfree: - free_rmid(rdtgrp->mon.rmid); out_destroy: kernfs_put(rdtgrp->kn); kernfs_remove(rdtgrp->kn); --=20 2.20.1