From nobody Sun Feb 8 11:21:34 2026 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 52F4E28134C; Sat, 10 Jan 2026 19:46:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768074369; cv=none; b=DWHixabGgB1yWAc2rvBCXUYWEpkxbX1T3VbT2GbcH8y5TUxhBntlT6rPu1QsHW3qxp+MJuHOsw5hrKvpwnxsaBui/axfE2LXwFFlp0mvD8s1eUTQEa2Cu24LJh8twb/38wZukkn5EiJDVcBXk0KwRFuSONVfFWpoVmFJKKm4huU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768074369; c=relaxed/simple; bh=4PQxsXkmUTz0XCDy4u4tF3HFGwy/8B1b8cHkqTYFtiY=; h=Date:From:To:Subject:Cc:MIME-Version:Message-ID:Content-Type; b=ZMYXZJIO/wFCiU3mpIlMrp58wkPnPk/0Je+J5Ji9KZy6NhtA4mrTABGGDjI26a5Shjz1vSY2iqAuPpskqsGyxChpIufAOcSnvOo+Ei9lIiJ9b69Jvxa6jFEpqyccjeEYInuRtng9H8X7toUXbgo1hgGBJ935Mz4zyrtZ9OyNMGk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=ZUt2IvUn; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=rrhEIgBJ; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="ZUt2IvUn"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="rrhEIgBJ" Date: Sat, 10 Jan 2026 19:45:57 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1768074359; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=24ZIa+ZX3C3P/6MKVcF1IC6Sz+a+0gJqvU5gKA6ylGs=; b=ZUt2IvUn9EuYDl5oZo1IgSUuMc0dt5o7YxltqipDGdZ/bTzmkTR1Y9jH7aIPWnan89QCQ2 iFmB/WKfz0HznKvt4kfOVpzUJTItZdtGXOvCPPAAaH9Bypy/5wMEeM5npDClQCfuWi1keM OC0P5DSAKwuRPUk9JylUcXAZFiQ9udFxJfPhsCLIdxtvTLYeJkvWsJeunp1ZGB5xjcYP7H BrHvAzdqVc82EmmrFLF9R7Gm+/tPK8tax5tNUPvshdZwzCYeKC5kepBLM4Epow0B4geUJ4 lWfq+U9hWP1TCHjoj5kyqWryysUaRoZ1LxacQX0GCxUJ4YnMgHg89GmCfBeoHA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1768074359; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=24ZIa+ZX3C3P/6MKVcF1IC6Sz+a+0gJqvU5gKA6ylGs=; b=rrhEIgBJYPFlYfY3ymuliN1SID/xabxIXWOhdLT38tp31zHgjytkvbZkDyLUENCb/jZEB+ ekD2ZsNuXYtOI+Dg== From: "tip-bot2 for Tony Luck" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: x86/cache] x86,fs/resctrl: Handle domain creation/deletion for RDT_RESOURCE_PERF_PKG Cc: Tony Luck , "Borislav Petkov (AMD)" , Reinette Chatre , x86@kernel.org, linux-kernel@vger.kernel.org Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <176807435775.510.16712181685635787207.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Precedence: bulk Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable The following commit has been merged into the x86/cache branch of tip: Commit-ID: f4e0cd80d3e7c31327459008b01d63804838a89d Gitweb: https://git.kernel.org/tip/f4e0cd80d3e7c31327459008b01d63804= 838a89d Author: Tony Luck AuthorDate: Wed, 17 Dec 2025 09:21:10 -08:00 Committer: Borislav Petkov (AMD) CommitterDate: Fri, 09 Jan 2026 23:36:41 +01:00 x86,fs/resctrl: Handle domain creation/deletion for RDT_RESOURCE_PERF_PKG 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 director= ies. Signed-off-by: Tony Luck Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Reinette Chatre Link: https://lore.kernel.org/20251217172121.12030-1-tony.luck@intel.com --- arch/x86/kernel/cpu/resctrl/core.c | 17 ++++++++++++++- arch/x86/kernel/cpu/resctrl/intel_aet.c | 29 ++++++++++++++++++++++++- arch/x86/kernel/cpu/resctrl/internal.h | 13 +++++++++++- fs/resctrl/rdtgroup.c | 17 +++++++++----- 4 files changed, 71 insertions(+), 5 deletions(-) diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resct= rl/core.c index 509277b..2514f15 100644 --- a/arch/x86/kernel/cpu/resctrl/core.c +++ b/arch/x86/kernel/cpu/resctrl/core.c @@ -580,6 +580,10 @@ 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; @@ -679,6 +683,19 @@ 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 96d627e..9351fe5 100644 --- a/arch/x86/kernel/cpu/resctrl/intel_aet.c +++ b/arch/x86/kernel/cpu/resctrl/intel_aet.c @@ -14,15 +14,20 @@ #include #include #include +#include #include #include +#include #include #include #include #include #include +#include +#include #include #include +#include #include #include #include @@ -283,3 +288,27 @@ int intel_aet_read_event(int domid, u32 rmid, void *ar= ch_priv, u64 *val) =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/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/r= esctrl/internal.h index 10743f5..3b228b2 100644 --- a/arch/x86/kernel/cpu/resctrl/internal.h +++ b/arch/x86/kernel/cpu/resctrl/internal.h @@ -88,6 +88,14 @@ static inline struct rdt_hw_l3_mon_domain *resctrl_to_ar= ch_mon_dom(struct rdt_l3 } =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 * @dom: The domain to update @@ -226,6 +234,8 @@ void resctrl_arch_mbm_cntr_assign_set_one(struct rdt_re= source *r); bool intel_aet_get_events(void); void __exit intel_aet_exit(void); int intel_aet_read_event(int domid, u32 rmid, 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) { } @@ -233,6 +243,9 @@ static inline int intel_aet_read_event(int domid, u32 r= mid, void *arch_priv, u64 { 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/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c index 57139f9..b9363a9 100644 --- a/fs/resctrl/rdtgroup.c +++ b/fs/resctrl/rdtgroup.c @@ -4308,11 +4308,6 @@ 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. @@ -4320,6 +4315,13 @@ 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)) { @@ -4416,6 +4418,9 @@ 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 @@ -4433,6 +4438,8 @@ 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