From nobody Fri Dec 19 03:04:00 2025 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.16]) (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 02DE91A08DA for ; Thu, 27 Jun 2024 20:39:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.16 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719520757; cv=none; b=uXa43lYuY9i+48/5hWQZD/OUzTpTbOwGyquIXQaL7eVAoFqRZGy63+hiq49Uy74lOasHE66uIxkTM1c0h6jpCB6L2OreY37Gd9Xz30dzqS9Qx3Wwgv0D7gyaYzIYtJNxooV7KXcS8aqDbF0Ng6SxiNOJ+j9zRuCfAqqSoLxAIBQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719520757; c=relaxed/simple; bh=E1OjYH+VizyHNJwzEabDMPXh9xsy+KGJwiXkqbLxewI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DVkstvFm+U5Mafk+7znnz2noQ2n+FgigNDns9aCPdSZlqr03KOP13kuZUY3M20ZBFyrz30H84vF+NaNQRqSI1q5JFVkkkL5gATMgwgUoWfHihFtpvjcMpTG4CGP/zfbeiGYjcBNXVbX+NiUR/6tI+C6Jt9VaBQwbCVbeNXa9Wro= 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=bcueBF2q; arc=none smtp.client-ip=198.175.65.16 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="bcueBF2q" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1719520755; x=1751056755; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=E1OjYH+VizyHNJwzEabDMPXh9xsy+KGJwiXkqbLxewI=; b=bcueBF2qaPQB6Rto6F3lmY1R38WN6D0u61BoCnT4d4cSkgJzBHEtMISK WYelBHog0EU07h/Wd+lYtsJYUFTXUOYihI5LKRCiBZaatY5M/yym+lqM+ 4xsws4pgkqOuvpvE/p0aIVjHTjD2Z0NakW/TNiqdtFxHURn9A5ljdep/h 8l29mNkPBuT+4REoYqyZWEAVf60DDMxinA0OnBqK+DOdUNqBpyUMNZ/Kt wQCNSBQykjT1BzqZrNk/d1pvJYRnCiXx01URLOzMeVF5CBagU8EucRmB+ SrA/HdVDd92n+UBz9BMzgEA2P4GZNcw0xp8wyxA4LKyZTDZs4lTN3pkvx A==; X-CSE-ConnectionGUID: WopXxEVER72OCrn4wngYmA== X-CSE-MsgGUID: HQN7kBLORUu/QgERlF/a4w== X-IronPort-AV: E=McAfee;i="6700,10204,11116"; a="16809799" X-IronPort-AV: E=Sophos;i="6.09,167,1716274800"; d="scan'208";a="16809799" Received: from orviesa001.jf.intel.com ([10.64.159.141]) by orvoesa108.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Jun 2024 13:39:09 -0700 X-CSE-ConnectionGUID: WmsZMNx3R/e6qo1fMUCE+g== X-CSE-MsgGUID: fMl+pyJ8RHGYAvKokkMCIQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.09,167,1716274800"; d="scan'208";a="82052903" Received: from agluck-desk3.sc.intel.com ([172.25.222.70]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Jun 2024 13:39:09 -0700 From: Tony Luck To: Fenghua Yu , Reinette Chatre , Maciej Wieczor-Retman , Peter Newman , James Morse , Babu Moger , Drew Fustini , Dave Martin Cc: x86@kernel.org, linux-kernel@vger.kernel.org, patches@lists.linux.dev, Tony Luck Subject: [PATCH v22 09/18] x86/resctrl: Add a new field to struct rmid_read for summation of domains Date: Thu, 27 Jun 2024 13:38:47 -0700 Message-ID: <20240627203856.66628-10-tony.luck@intel.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240627203856.66628-1-tony.luck@intel.com> References: <20240627203856.66628-1-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" When a user reads a monitor file rdtgroup_mondata_show() calls mon_event_read() to package up all the required details into an rmid_read structure which is passed across the smp_call*() infrastructure to code that will read data from hardware and return the value (or error status) in the rmid_read structure. Sub-NUMA Cluster (SNC) mode adds files with new semantics. These require the smp_call-ed code to sum event data from all domains that share an L3 cache. Add a pointer to the L3 "cacheinfo" structure to struct rmid_read for the data collection routines to use to pick the domains to be summed. Initialize all on-stack declarations of struct rmid_read: rdtgroup_mondata_show() mbm_update() mkdir_mondata_subdir() to ensure that garbage values from the stack are not passed down to other functions. Remove redundant rr->val =3D 0; from mon_event_read() and rr.first =3D fals= e; from mbm_update() since the rmid_read structure is cleared by compiler. Reinette suggested that the rmid_read structure has become complex enough to warrant documentation of each of its fields and provided the kerneldoc documentation for struct rmid_read. Co-developed-by: Reinette Chatre Signed-off-by: Reinette Chatre Signed-off-by: Tony Luck --- arch/x86/kernel/cpu/resctrl/internal.h | 19 +++++++++++++++++++ arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 3 +-- arch/x86/kernel/cpu/resctrl/monitor.c | 3 +-- arch/x86/kernel/cpu/resctrl/rdtgroup.c | 2 +- 4 files changed, 22 insertions(+), 5 deletions(-) diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/r= esctrl/internal.h index 135190e0711c..681b5bdcd2f9 100644 --- a/arch/x86/kernel/cpu/resctrl/internal.h +++ b/arch/x86/kernel/cpu/resctrl/internal.h @@ -144,12 +144,31 @@ union mon_data_bits { } u; }; =20 +/** + * struct rmid_read - Data passed across smp_call*() to read event count. + * @rgrp: Resource group for which the counter is being read. If it is a = parent + * resource group then its event count is summed with the count from all + * its child resource groups. + * @r: Resource describing the properties of the event being read. + * @d: Domain that the counter should be read from. If NULL then sum all + * domains in @r sharing L3 @ci.id + * @evtid: Which monitor event to read. + * @first: Initialize MBM counter when true. + * @ci: Cacheinfo for L3. Only set when @d is NULL. Used when summing d= omains. + * @err: Error encountered when reading counter. + * @val: Returned value of event counter. If @rgrp is a parent resource = group, + * @val includes the sum of event counts from its child resource groups. + * If @d is NULL, @val includes the sum of all domains in @r sharing @c= i.id, + * (summed across child resource groups if @rgrp is a parent resource g= roup). + * @arch_mon_ctx: Hardware monitor allocated for this read request (MPAM o= nly). + */ struct rmid_read { struct rdtgroup *rgrp; struct rdt_resource *r; struct rdt_mon_domain *d; enum resctrl_event_id evtid; bool first; + struct cacheinfo *ci; int err; u64 val; void *arch_mon_ctx; diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cp= u/resctrl/ctrlmondata.c index 3b9383612c35..4d76ff31a9e0 100644 --- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c +++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c @@ -529,7 +529,6 @@ void mon_event_read(struct rmid_read *rr, struct rdt_re= source *r, rr->evtid =3D evtid; rr->r =3D r; rr->d =3D d; - rr->val =3D 0; rr->first =3D first; rr->arch_mon_ctx =3D resctrl_arch_mon_ctx_alloc(r, evtid); if (IS_ERR(rr->arch_mon_ctx)) { @@ -557,12 +556,12 @@ int rdtgroup_mondata_show(struct seq_file *m, void *a= rg) { struct kernfs_open_file *of =3D m->private; struct rdt_domain_hdr *hdr; + struct rmid_read rr =3D {0}; struct rdt_mon_domain *d; u32 resid, evtid, domid; struct rdtgroup *rdtgrp; struct rdt_resource *r; union mon_data_bits md; - struct rmid_read rr; int ret =3D 0; =20 rdtgrp =3D rdtgroup_kn_lock_live(of->kn); diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/re= sctrl/monitor.c index ff4e74594a19..ca309c93a56b 100644 --- a/arch/x86/kernel/cpu/resctrl/monitor.c +++ b/arch/x86/kernel/cpu/resctrl/monitor.c @@ -780,9 +780,8 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct= rdt_mon_domain *dom_mbm) static void mbm_update(struct rdt_resource *r, struct rdt_mon_domain *d, u32 closid, u32 rmid) { - struct rmid_read rr; + struct rmid_read rr =3D {0}; =20 - rr.first =3D false; rr.r =3D r; rr.d =3D d; =20 diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/r= esctrl/rdtgroup.c index 70d41a8fd788..d0443589cd86 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -3029,10 +3029,10 @@ static int mkdir_mondata_subdir(struct kernfs_node = *parent_kn, struct rdt_mon_domain *d, struct rdt_resource *r, struct rdtgroup *prgrp) { + struct rmid_read rr =3D {0}; union mon_data_bits priv; struct kernfs_node *kn; struct mon_evt *mevt; - struct rmid_read rr; char name[32]; int ret; =20 --=20 2.45.2