From nobody Mon Feb 9 12:23:54 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 9FD5327932A for ; Fri, 28 Feb 2025 20:01:40 +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=1740772902; cv=none; b=p1uifela7Gd3gK3necj4OuMVkcOdYkMPM64tM5bMSX5/cyi7WpzaJRnSJR2QRSAAWuphnvuWP3VXJi0pTT2epUhGp/yhEpgaKFl1ekdk0aeA4FpFreeyjRvSIaSerxOQcDC3FOQblrTRMAtQrqbo3F6KoHQabJ7P5LyA1+guX5I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740772902; c=relaxed/simple; bh=JW093qHbvRg22lWcZVjFoSM7nW7gbPU1cfiw8U9NZ68=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=D/qTwO7CQpAXPRvjX6P5N83BdcC43o5c8vxn/3kyUiITUZf9CBAmVSsG9KlC7FG78bEK28+j1k4P2WtQhW5ByiihQ9wb3elR4iArjBBWzxCXyuJNtnu7/L8W/JTQBqKrL0j+C0MDXyFF5O6THG5wvFSV+MVyT3cTarYOYHWgzbU= 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 5186F1A25; Fri, 28 Feb 2025 12:01:55 -0800 (PST) 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 17BFC3F5A1; Fri, 28 Feb 2025 12:01:36 -0800 (PST) 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 Subject: [PATCH v7 28/49] x86/resctrl: Handle throttle_mode for SMBA resources Date: Fri, 28 Feb 2025 19:58:52 +0000 Message-Id: <20250228195913.24895-29-james.morse@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20250228195913.24895-1-james.morse@arm.com> References: <20250228195913.24895-1-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" Now that the visibility of throttle_mode is being managed by resctrl, it should consider resources other than MBA that may have a throttle_mode. SMBA is one such resource. Extend thread_throttle_mode_init() to check SMBA for a throttle_mode. Adding support for multiple resources means it is possible for a platform with both MBA and SMBA, but an undefined throttle_mode on one of them to make the file visible. Add the 'undefined' case to rdt_thread_throttle_mode_show(). Signed-off-by: James Morse Reviewed-by: Reinette Chatre Reviewed-by: Fenghua Yu --- Changes since v6: * Refer to thread_throttle_mode_init() in the commit message. Changes since v5: * This change split out of the previous patch. --- arch/x86/kernel/cpu/resctrl/rdtgroup.c | 33 +++++++++++++++++++++----- 1 file changed, 27 insertions(+), 6 deletions(-) diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/r= esctrl/rdtgroup.c index 58feba3feefd..5fc60c9ce28f 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -1188,10 +1188,19 @@ static int rdt_thread_throttle_mode_show(struct ker= nfs_open_file *of, struct resctrl_schema *s =3D of->kn->parent->priv; struct rdt_resource *r =3D s->res; =20 - if (r->membw.throttle_mode =3D=3D THREAD_THROTTLE_PER_THREAD) + switch (r->membw.throttle_mode) { + case THREAD_THROTTLE_PER_THREAD: seq_puts(seq, "per-thread\n"); - else + return 0; + case THREAD_THROTTLE_MAX: seq_puts(seq, "max\n"); + return 0; + case THREAD_THROTTLE_UNDEFINED: + seq_puts(seq, "undefined\n"); + return 0; + } + + WARN_ON_ONCE(1); =20 return 0; } @@ -2066,12 +2075,24 @@ static struct rftype *rdtgroup_get_rftype_by_name(c= onst char *name) =20 static void thread_throttle_mode_init(void) { - struct rdt_resource *r_mba; + enum membw_throttle_mode throttle_mode =3D THREAD_THROTTLE_UNDEFINED; + struct rdt_resource *r_mba, *r_smba; =20 r_mba =3D resctrl_arch_get_resource(RDT_RESOURCE_MBA); - if (r_mba->membw.throttle_mode !=3D THREAD_THROTTLE_UNDEFINED) - resctrl_file_fflags_init("thread_throttle_mode", - RFTYPE_CTRL_INFO | RFTYPE_RES_MB); + if (r_mba->alloc_capable && + r_mba->membw.throttle_mode !=3D THREAD_THROTTLE_UNDEFINED) + throttle_mode =3D r_mba->membw.throttle_mode; + + r_smba =3D resctrl_arch_get_resource(RDT_RESOURCE_SMBA); + if (r_smba->alloc_capable && + r_smba->membw.throttle_mode !=3D THREAD_THROTTLE_UNDEFINED) + throttle_mode =3D r_smba->membw.throttle_mode; + + if (throttle_mode =3D=3D THREAD_THROTTLE_UNDEFINED) + return; + + resctrl_file_fflags_init("thread_throttle_mode", + RFTYPE_CTRL_INFO | RFTYPE_RES_MB); } =20 void resctrl_file_fflags_init(const char *config, unsigned long fflags) --=20 2.39.5