From nobody Sun Feb 8 17:29:39 2026 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.21]) (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 F085080C0C for ; Fri, 28 Jun 2024 21:56:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.21 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719611794; cv=none; b=E18hXmNwuQFHYzWmRRtl4mIAMwQLcoTGr1ePGgHKhFUwu2n90DZFYAsyGrC7yTEqTTNgtwK7r1mdZNW4k7hW5prsrBmqu7FU3ZH2DMtsoTUAxu3B4ciI4V7ZHbEpYNf4GVdWmBCJ08xTBILXmlhf/eDpTvB8gdwmf635YUQ1608= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719611794; c=relaxed/simple; bh=fm2QZisifdMg+3x+dqCxv5EqypsHdl6yyTP9VR+uJyY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=fpPNVzRos9XHUIoU3nBnjlPzYtMa2lNbaO5nHQto9PNLeli9zPT9ElLJ2NrRZ5QXGZC4ih1AME3T9xKBWL1mrps9R9s8L8/etGwtX74p7PG6nlC7G/EuArdmMcB0It82TnJ5SzlCneFfHk5ttmaZCm4qcKpW0n+qlqUn/dMFBsE= 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=BWNdF6xw; arc=none smtp.client-ip=198.175.65.21 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="BWNdF6xw" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1719611793; x=1751147793; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=fm2QZisifdMg+3x+dqCxv5EqypsHdl6yyTP9VR+uJyY=; b=BWNdF6xwRjwZgGJ5bPSYeXRC7CNwCesIVbCL3sjdLkWjUq7+G9w+cBAp snmk3+lPFIr+6VNeVORuIPJ3BrRS74KQxbL0l3Mb+ruqhXaT4Ml1rDCL5 XdYQVSAGcBv7Z5c8ad5tteZO7efMD7YDMp9jQ5SlJ6N9Jd88YJg8JCQfA dmNguoq0cWQlX2QM+Y9WK2kLPR6YsjbxsHXcnHv7kA1krrsVHqYome0js WSIezHeqSSUwJPBO/U+rO8hTyS+8cCgBi9kYDlzXQLVWWjqeK0WCA7sGs 1emcvo/6+avH4fCStYU2lruYmpF5un4qYWrtI/knlPqa5OAbwYWDP17A7 w==; X-CSE-ConnectionGUID: U/93V12KR6qIxSygjXEQWg== X-CSE-MsgGUID: q0UeCca8SBW2dl9i+eK44w== X-IronPort-AV: E=McAfee;i="6700,10204,11117"; a="16762587" X-IronPort-AV: E=Sophos;i="6.09,170,1716274800"; d="scan'208";a="16762587" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by orvoesa113.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Jun 2024 14:56:28 -0700 X-CSE-ConnectionGUID: uWBR2WMUSv65y3+vnd5c5w== X-CSE-MsgGUID: LXqVnXS9RXmzsxcXaL+iUA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.09,170,1716274800"; d="scan'208";a="68065660" Received: from agluck-desk3.sc.intel.com ([172.25.222.70]) by fmviesa002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Jun 2024 14:56:27 -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 v23 09/19] x86/resctrl: Add a new field to struct rmid_read for summation of domains Date: Fri, 28 Jun 2024 14:56:09 -0700 Message-ID: <20240628215619.76401-10-tony.luck@intel.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240628215619.76401-1-tony.luck@intel.com> References: <20240628215619.76401-1-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. 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 +++++++++++++++++++ 1 file changed, 19 insertions(+) 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; --=20 2.45.2