From nobody Tue Dec 16 14:57:44 2025 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id CF3E12D8764 for ; Fri, 5 Dec 2025 22:00:25 +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=1764972034; cv=none; b=MyTFEZ+8e2iPAhCl6PrZkR7DY6mxyV5hwwmgHCdU21MufQ9VeMhvP4UBNmUxSDxw+TydzWALGewaWRZnif7ENjopar0BjJCJg/RWkitZ1Q94yM1eSok7K7lAm3t3cOSPJ39GNEgxo0ZDyZxDt/R4G6lgnmvQ2NgMhGPtAy3DjeI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764972034; c=relaxed/simple; bh=Y36uoDk6T4dqX2I4zKbULgvLaYHJP5anK1wuFS3v+B4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ECqr5hz9e9xsoO6c6bLcAI+OF3ceHx033jarvXRe5cuz8Emm2fBHq1pGxOpBJe1iKn+I02ReEpUj7roFCh9om07UGXEJygJNFKtwtWCjBfVVEC5DnRjzHfRqmw62xWYfnPp+xuMJ8dcnyrhdreDq/NAHrD68MXi+w6F3F1RsCPo= 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 CFD2E1AED; Fri, 5 Dec 2025 14:00:17 -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 5DB043F740; Fri, 5 Dec 2025 14:00:21 -0800 (PST) From: James Morse To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: James Morse , 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 , Dave Martin , Koba Ko , Shanker Donthineni , fenghuay@nvidia.com, baisheng.gao@unisoc.com, Jonathan Cameron , Gavin Shan , Ben Horgan , rohit.mathew@arm.com, reinette.chatre@intel.com, Punit Agrawal Subject: [RFC PATCH 14/38] arm_mpam: resctrl: Add rmid index helpers Date: Fri, 5 Dec 2025 21:58:37 +0000 Message-Id: <20251205215901.17772-15-james.morse@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20251205215901.17772-1-james.morse@arm.com> References: <20251205215901.17772-1-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" Because MPAM's pmg aren't identical to RDT's rmid, resctrl handles some data structures by index. This allows x86 to map indexes to RMID, and MPAM to map them to partid-and-pmg. Add the helpers to do this. Signed-off-by: James Morse --- drivers/resctrl/mpam_resctrl.c | 28 ++++++++++++++++++++++++++++ include/linux/arm_mpam.h | 3 +++ 2 files changed, 31 insertions(+) diff --git a/drivers/resctrl/mpam_resctrl.c b/drivers/resctrl/mpam_resctrl.c index d5f75ed67e46..19d70d00bbcc 100644 --- a/drivers/resctrl/mpam_resctrl.c +++ b/drivers/resctrl/mpam_resctrl.c @@ -120,6 +120,34 @@ u32 resctrl_arch_get_num_closid(struct rdt_resource *i= gnored) return mpam_partid_max + 1; } =20 +u32 resctrl_arch_system_num_rmid_idx(void) +{ + u8 closid_shift =3D fls(mpam_pmg_max); + u32 num_partid =3D resctrl_arch_get_num_closid(NULL); + + return num_partid << closid_shift; +} + +u32 resctrl_arch_rmid_idx_encode(u32 closid, u32 rmid) +{ + u8 closid_shift =3D fls(mpam_pmg_max); + + WARN_ON_ONCE(closid_shift > 8); + + return (closid << closid_shift) | rmid; +} + +void resctrl_arch_rmid_idx_decode(u32 idx, u32 *closid, u32 *rmid) +{ + u8 closid_shift =3D fls(mpam_pmg_max); + u32 pmg_mask =3D ~(~0 << closid_shift); + + WARN_ON_ONCE(closid_shift > 8); + + *closid =3D idx >> closid_shift; + *rmid =3D idx & pmg_mask; +} + void resctrl_arch_sched_in(struct task_struct *tsk) { lockdep_assert_preemption_disabled(); diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h index ba0312b55d9f..385554ceb452 100644 --- a/include/linux/arm_mpam.h +++ b/include/linux/arm_mpam.h @@ -59,6 +59,9 @@ void resctrl_arch_set_cpu_default_closid_rmid(int cpu, u3= 2 closid, u32 rmid); void resctrl_arch_sched_in(struct task_struct *tsk); bool resctrl_arch_match_closid(struct task_struct *tsk, u32 closid); bool resctrl_arch_match_rmid(struct task_struct *tsk, u32 closid, u32 rmid= ); +u32 resctrl_arch_rmid_idx_encode(u32 closid, u32 rmid); +void resctrl_arch_rmid_idx_decode(u32 idx, u32 *closid, u32 *rmid); +u32 resctrl_arch_system_num_rmid_idx(void); =20 /** * mpam_register_requestor() - Register a requestor with the MPAM driver --=20 2.39.5