From nobody Sun Feb 8 16:31:50 2026 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CBCCF328B48 for ; Wed, 29 Oct 2025 16:21:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.12 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761754905; cv=none; b=Kg93t3RFU0d3z5a5jKKARaFcTeeJQxJ7TanAbc0kre9L8OfCeufxT4MnAdzRj8AZDH2DDng8HZAOQhp9JHMe938AFKlwGlgJaoQYYcpHja3K1XPTtsmmWcTBk0dd8jDOTnvBvh9FMO8dNrDN/cNH/+L/lOBXlnFPhUV+jlVzLOI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761754905; c=relaxed/simple; bh=gf0ijAqCFuoAR2U+zPMAQLDgHChQal9Fgwms16TQbOg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=j2U6hk9bHfSLQ/vIhnkqVCDI8vbU75A4+pB4eiFFZQvnK9KQfXmUDZ11YsNqWrpbaj1hT5A40CxQrxDtL+EpG7tPpQRkLn+uBFKZIZBpVjnwBqjVH09ILTuYkv/mg6rxWAqv6PvvPkUOxB94n6FRHQ/cmJ+7LeZALBenFDm3ilA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=cCk7lR2u; arc=none smtp.client-ip=198.175.65.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="cCk7lR2u" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1761754902; x=1793290902; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=gf0ijAqCFuoAR2U+zPMAQLDgHChQal9Fgwms16TQbOg=; b=cCk7lR2uxm6WdXHft90XQ3PSFVAN1QNSp5YhxqjQE5nv6X/uSKx4G9Ee j5df2JxtUYUDN8NvfbgOJRjsA492IkqcTvmH3xTK7SsNlqxWfUjdSQ57l Jkn5Kwa7G+sbwWLWjqBPgI9t1rkOUTE3rGUKVVwkomOE3YEos83A8wCJy PvuJ/0YNtg0i13hpzGlag/1S6DFSSvOsg58Mq1kD5ZvWU0iFOId/8lAT9 yDT0WV1rqTuItFIE/y+bmO4+TuTuuTuEq4VhuhHoO/zwuTac7S91uue0L s5bWdWFQl/v5ajnMp9aFiJ62BJQB7komcLXB1ef3Rr3g0P34a+bB8RhrS A==; X-CSE-ConnectionGUID: f/nw0V32Q9iwsroPnZZhuQ== X-CSE-MsgGUID: GDToqCfxSm+TpqCx3dlCFA== X-IronPort-AV: E=McAfee;i="6800,10657,11597"; a="75331035" X-IronPort-AV: E=Sophos;i="6.19,264,1754982000"; d="scan'208";a="75331035" Received: from orviesa006.jf.intel.com ([10.64.159.146]) by orvoesa104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Oct 2025 09:21:33 -0700 X-CSE-ConnectionGUID: dfu7ZWJKSeOG2zdcWHsxfA== X-CSE-MsgGUID: ZMWjUWOGTGeaKvaQD2iJuQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.19,264,1754982000"; d="scan'208";a="184901389" Received: from mgerlach-mobl1.amr.corp.intel.com (HELO agluck-desk3.home.arpa) ([10.124.223.146]) by orviesa006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Oct 2025 09:21:33 -0700 From: Tony Luck To: Fenghua Yu , Reinette Chatre , Maciej Wieczor-Retman , Peter Newman , James Morse , Babu Moger , Drew Fustini , Dave Martin , Chen Yu Cc: x86@kernel.org, linux-kernel@vger.kernel.org, patches@lists.linux.dev, Tony Luck Subject: [PATCH v13 23/32] x86,fs/resctrl: Handle domain creation/deletion for RDT_RESOURCE_PERF_PKG Date: Wed, 29 Oct 2025 09:21:06 -0700 Message-ID: <20251029162118.40604-24-tony.luck@intel.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251029162118.40604-1-tony.luck@intel.com> References: <20251029162118.40604-1-tony.luck@intel.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" The L3 resource has several requirements for domains. There are per-domain structures that hold the 64-bit values of counters, and elements to keep track of the overflow and limbo threads. None of these are needed for the PERF_PKG resource. The hardware counters are wide enough that they do not wrap around for decades. Define a new rdt_perf_pkg_mon_domain structure which just consists of the standard rdt_domain_hdr to keep track of domain id and CPU mask. Update resctrl_online_mon_domain() for RDT_RESOURCE_PERF_PKG. The only acti= on needed for this resource is to create and populate domain directories if a domain is added while resctrl is mounted. Similarly resctrl_offline_mon_domain() only needs to remove domain directories. Signed-off-by: Tony Luck Reviewed-by: Reinette Chatre --- arch/x86/kernel/cpu/resctrl/internal.h | 13 +++++++++++ arch/x86/kernel/cpu/resctrl/core.c | 17 +++++++++++++++ arch/x86/kernel/cpu/resctrl/intel_aet.c | 29 +++++++++++++++++++++++++ fs/resctrl/rdtgroup.c | 17 ++++++++++----- 4 files changed, 71 insertions(+), 5 deletions(-) diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/r= esctrl/internal.h index 97616c81682b..b920f54f8736 100644 --- a/arch/x86/kernel/cpu/resctrl/internal.h +++ b/arch/x86/kernel/cpu/resctrl/internal.h @@ -84,6 +84,14 @@ static inline struct rdt_hw_l3_mon_domain *resctrl_to_ar= ch_mon_dom(struct rdt_l3 return container_of(r, struct rdt_hw_l3_mon_domain, d_resctrl); } =20 +/** + * struct rdt_perf_pkg_mon_domain - CPUs sharing an package scoped resctrl= monitor resource + * @hdr: common header for different domain types + */ +struct rdt_perf_pkg_mon_domain { + struct rdt_domain_hdr hdr; +}; + /** * struct msr_param - set a range of MSRs from a domain * @res: The resource to use @@ -222,6 +230,8 @@ bool intel_aet_get_events(void); void __exit intel_aet_exit(void); int intel_aet_read_event(int domid, u32 rmid, enum resctrl_event_id evtid, void *arch_priv, u64 *val); +void intel_aet_mon_domain_setup(int cpu, int id, struct rdt_resource *r, + struct list_head *add_pos); #else static inline bool intel_aet_get_events(void) { return false; } static inline void __exit intel_aet_exit(void) { } @@ -230,6 +240,9 @@ static inline int intel_aet_read_event(int domid, u32 r= mid, enum resctrl_event_i { return -EINVAL; } + +static inline void intel_aet_mon_domain_setup(int cpu, int id, struct rdt_= resource *r, + struct list_head *add_pos) { } #endif =20 #endif /* _ASM_X86_RESCTRL_INTERNAL_H */ diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resct= rl/core.c index d759093e7dce..ba1ddc2eec15 100644 --- a/arch/x86/kernel/cpu/resctrl/core.c +++ b/arch/x86/kernel/cpu/resctrl/core.c @@ -575,6 +575,10 @@ static void domain_add_cpu_mon(int cpu, struct rdt_res= ource *r) if (!hdr) l3_mon_domain_setup(cpu, id, r, add_pos); break; + case RDT_RESOURCE_PERF_PKG: + if (!hdr) + intel_aet_mon_domain_setup(cpu, id, r, add_pos); + break; default: pr_warn_once("Unknown resource rid=3D%d\n", r->rid); break; @@ -674,6 +678,19 @@ static void domain_remove_cpu_mon(int cpu, struct rdt_= resource *r) l3_mon_domain_free(hw_dom); break; } + case RDT_RESOURCE_PERF_PKG: { + struct rdt_perf_pkg_mon_domain *pkgd; + + if (!domain_header_is_valid(hdr, RESCTRL_MON_DOMAIN, RDT_RESOURCE_PERF_P= KG)) + return; + + pkgd =3D container_of(hdr, struct rdt_perf_pkg_mon_domain, hdr); + resctrl_offline_mon_domain(r, hdr); + list_del_rcu(&hdr->list); + synchronize_rcu(); + kfree(pkgd); + break; + } default: pr_warn_once("Unknown resource rid=3D%d\n", r->rid); break; diff --git a/arch/x86/kernel/cpu/resctrl/intel_aet.c b/arch/x86/kernel/cpu/= resctrl/intel_aet.c index f64fb7d0c8a9..781ca8ede39e 100644 --- a/arch/x86/kernel/cpu/resctrl/intel_aet.c +++ b/arch/x86/kernel/cpu/resctrl/intel_aet.c @@ -17,16 +17,21 @@ #include #include #include +#include #include #include +#include #include #include #include #include #include #include +#include +#include #include #include +#include #include #include #include @@ -269,3 +274,27 @@ int intel_aet_read_event(int domid, u32 rmid, enum res= ctrl_event_id eventid, =20 return valid ? 0 : -EINVAL; } + +void intel_aet_mon_domain_setup(int cpu, int id, struct rdt_resource *r, + struct list_head *add_pos) +{ + struct rdt_perf_pkg_mon_domain *d; + int err; + + d =3D kzalloc_node(sizeof(*d), GFP_KERNEL, cpu_to_node(cpu)); + if (!d) + return; + + d->hdr.id =3D id; + d->hdr.type =3D RESCTRL_MON_DOMAIN; + d->hdr.rid =3D RDT_RESOURCE_PERF_PKG; + cpumask_set_cpu(cpu, &d->hdr.cpu_mask); + list_add_tail_rcu(&d->hdr.list, add_pos); + + err =3D resctrl_online_mon_domain(r, &d->hdr); + if (err) { + list_del_rcu(&d->hdr.list); + synchronize_rcu(); + kfree(d); + } +} diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c index 4f461ec773d6..84336b6e1679 100644 --- a/fs/resctrl/rdtgroup.c +++ b/fs/resctrl/rdtgroup.c @@ -4241,11 +4241,6 @@ void resctrl_offline_mon_domain(struct rdt_resource = *r, struct rdt_domain_hdr *h =20 mutex_lock(&rdtgroup_mutex); =20 - if (!domain_header_is_valid(hdr, RESCTRL_MON_DOMAIN, RDT_RESOURCE_L3)) - goto out_unlock; - - d =3D container_of(hdr, struct rdt_l3_mon_domain, hdr); - /* * If resctrl is mounted, remove all the * per domain monitor data directories. @@ -4253,6 +4248,13 @@ void resctrl_offline_mon_domain(struct rdt_resource = *r, struct rdt_domain_hdr *h if (resctrl_mounted && resctrl_arch_mon_capable()) rmdir_mondata_subdir_allrdtgrp(r, hdr); =20 + if (r->rid !=3D RDT_RESOURCE_L3) + goto out_unlock; + + if (!domain_header_is_valid(hdr, RESCTRL_MON_DOMAIN, RDT_RESOURCE_L3)) + goto out_unlock; + + d =3D container_of(hdr, struct rdt_l3_mon_domain, hdr); if (resctrl_is_mbm_enabled()) cancel_delayed_work(&d->mbm_over); if (resctrl_is_mon_event_enabled(QOS_L3_OCCUP_EVENT_ID) && has_busy_rmid(= d)) { @@ -4349,6 +4351,9 @@ int resctrl_online_mon_domain(struct rdt_resource *r,= struct rdt_domain_hdr *hdr =20 mutex_lock(&rdtgroup_mutex); =20 + if (r->rid !=3D RDT_RESOURCE_L3) + goto mkdir; + if (!domain_header_is_valid(hdr, RESCTRL_MON_DOMAIN, RDT_RESOURCE_L3)) goto out_unlock; =20 @@ -4366,6 +4371,8 @@ int resctrl_online_mon_domain(struct rdt_resource *r,= struct rdt_domain_hdr *hdr if (resctrl_is_mon_event_enabled(QOS_L3_OCCUP_EVENT_ID)) INIT_DELAYED_WORK(&d->cqm_limbo, cqm_handle_limbo); =20 +mkdir: + err =3D 0; /* * If the filesystem is not mounted then only the default resource group * exists. Creation of its directories is deferred until mount time --=20 2.51.0