From nobody Mon Feb 9 13:36:30 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 4F34B1DE4D4 for ; Fri, 7 Feb 2025 18:20:18 +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=1738952421; cv=none; b=tkRt59xJGB2ns9B1MjZHvnLaCZAeMkxuq4Ap1Fl+wlWaaPn2AQ2psDtOlWl/8n1EVcEqgzF269DfW1R0F3sl/HEptWTiDb8YtLHcp2qGTPJiy8X32HKMtaCEAInQKlREve88bfHy0wACpeAz7FPacB5vt7LqylctewzUB4X+Hi4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738952421; c=relaxed/simple; bh=bmciXJaZV9HHK4Q9ivAqMxBoZlpxNrpk/8Wd+W2iqaQ=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=EObZn/e+oGePkdHZMdciZD9btxPUDjiiixtVi1VEmvUDerrAhawpHJSujYVQ6xQno5Tjma1qR0q0ft3XivSrbQAIONqCW+YAZDxIajTspje4uAY5FBexegXojkk1P0Pm2RfzcGyDH5CcCukaFqMoVXL4O2AjkInbqDzHV3eeQsg= 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 5D1271EA6; Fri, 7 Feb 2025 10:20:41 -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 749EE3F63F; Fri, 7 Feb 2025 10:20:15 -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 Subject: [PATCH v6 27/42] x86/resctrl: Move RFTYPE flags to be managed by resctrl Date: Fri, 7 Feb 2025 18:18:08 +0000 Message-Id: <20250207181823.6378-28-james.morse@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20250207181823.6378-1-james.morse@arm.com> References: <20250207181823.6378-1-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_file_fflags_init() is called from the architecture specific code to make the 'thread_throttle_mode' file visible. The architecture specific code has already set the membw.throttle_mode in the rdt_resource. This forces the RFTYPE flags used by resctrl to be exposed to the architecture specific code. This doesn't need to be specific to the architecture, the throttle_mode can be used by resctrl to determine if the 'thread_throttle_mode' file should be visible. This allows the RFTYPE flags to be private to resctrl. Add thread_throttle_mode_init(), and use it to call resctrl_file_fflags_init() from resctrl_setup(). This avoids publishing an extra function between the architecture and filesystem code. Signed-off-by: James Morse --- Changes since v5: * Added checking for SMBA. * Added printing of undefined to rdt_thread_throttle_mode_show(). * Major juggling around commit 2937f9c361f7 ("x86/resctrl: Introduce resct= rl_file_fflags_init() to initialize fflags") * Dropped tags, split patch --- arch/x86/kernel/cpu/resctrl/core.c | 3 --- arch/x86/kernel/cpu/resctrl/rdtgroup.c | 12 ++++++++++++ 2 files changed, 12 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resct= rl/core.c index 1fb4eb4e0ea9..e4b676879227 100644 --- a/arch/x86/kernel/cpu/resctrl/core.c +++ b/arch/x86/kernel/cpu/resctrl/core.c @@ -229,9 +229,6 @@ static __init bool __get_mem_config_intel(struct rdt_re= source *r) else r->membw.throttle_mode =3D THREAD_THROTTLE_MAX; =20 - resctrl_file_fflags_init("thread_throttle_mode", - RFTYPE_CTRL_INFO | RFTYPE_RES_MB); - r->alloc_capable =3D true; =20 return true; diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/r= esctrl/rdtgroup.c index e59271515a46..58feba3feefd 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -2064,6 +2064,16 @@ static struct rftype *rdtgroup_get_rftype_by_name(co= nst char *name) return NULL; } =20 +static void thread_throttle_mode_init(void) +{ + struct rdt_resource *r_mba; + + 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); +} + void resctrl_file_fflags_init(const char *config, unsigned long fflags) { struct rftype *rft; @@ -4277,6 +4287,8 @@ int __init resctrl_init(void) =20 rdtgroup_setup_default(); =20 + thread_throttle_mode_init(); + ret =3D resctrl_mon_resource_init(); if (ret) return ret; --=20 2.39.2