From patchwork Thu Jan 19 06:01:05 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Sun X-Patchwork-Id: 9525225 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id E044460437 for ; Thu, 19 Jan 2017 06:05:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CCFFC28610 for ; Thu, 19 Jan 2017 06:05:31 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C1AE72863A; Thu, 19 Jan 2017 06:05:31 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 35EC428610 for ; Thu, 19 Jan 2017 06:05:31 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cU5oA-0006nx-S2; Thu, 19 Jan 2017 06:02:50 +0000 Received: from mail6.bemta3.messagelabs.com ([195.245.230.39]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cU5o9-0006nD-Jn for xen-devel@lists.xenproject.org; Thu, 19 Jan 2017 06:02:49 +0000 Received: from [85.158.137.68] by server-1.bemta-3.messagelabs.com id 3C/99-20518-88650885; Thu, 19 Jan 2017 06:02:48 +0000 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrFLMWRWlGSWpSXmKPExsVywNykQrcjrCH C4MsdPovvWyYzOTB6HP5whSWAMYo1My8pvyKBNWPipjksBasdKx41NrI1MK7U62Lk5BASqJRo n/SZEcSWEOCVOLJsBiuE7S9x+FwrkM0FVNPAKHFgQzsTSIJNQF3i8dceMFtEQEni3qrJTCBFz ALdTBIrH25l6WLk4BAWCJbYeo4dpIZFQFVi0vMvYEN5Bdwl5jdcYINYICdx8thksDingIfElf kX2CEOcpfYsuIS0wRG3gWMDKsYNYpTi8pSi3QNLfWSijLTM0pyEzNzdA0NjPVyU4uLE9NTcxK TivWS83M3MQLDoZ6BgXEH4+/jfocYJTmYlER57S0bIoT4kvJTKjMSizPii0pzUosPMcpwcChJ 8M4JBcoJFqWmp1akZeYAAxMmLcHBoyTCWwWS5i0uSMwtzkyHSJ1i1OX4svPMSyYhlrz8vFQpc d4okCIBkKKM0jy4EbAoucQoKyXMy8jAwCDEU5BalJtZgir/ilGcg1FJmLcGZApPZl4J3KZXQE cwAR1hpVwPckRJIkJKqoFx/5m+s20OsQc3hXNOiFx5vfrsc/Yvxl8rv3G4q556x/P52NZrhWE 14uYXpMSY8rz4z+/2F/X+srLoZMm+hJRjAon5+583xx018J62zziCrY1F6x3jg8aDId+WrpRV VFj3xLRk5r9Ejgmfba/eWmvWuvjsYf4J+3omvH6zYqKvzfFTsacSjlb/VmIpzkg01GIuKk4EA KV2g4CNAgAA X-Env-Sender: yi.y.sun@linux.intel.com X-Msg-Ref: server-3.tower-31.messagelabs.com!1484805763!81281826!4 X-Originating-IP: [192.55.52.120] X-SpamReason: No, hits=0.5 required=7.0 tests=BODY_RANDOM_LONG X-StarScan-Received: X-StarScan-Version: 9.1.1; banners=-,-,- X-VirusChecked: Checked Received: (qmail 12452 invoked from network); 19 Jan 2017 06:02:47 -0000 Received: from mga04.intel.com (HELO mga04.intel.com) (192.55.52.120) by server-3.tower-31.messagelabs.com with DHE-RSA-AES256-GCM-SHA384 encrypted SMTP; 19 Jan 2017 06:02:47 -0000 Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga104.fm.intel.com with ESMTP; 18 Jan 2017 22:02:45 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.33,252,1477983600"; d="scan'208";a="215119449" Received: from vmmmba-s2600wft.bj.intel.com ([10.240.193.63]) by fmsmga004.fm.intel.com with ESMTP; 18 Jan 2017 22:02:43 -0800 From: Yi Sun To: xen-devel@lists.xenproject.org Date: Thu, 19 Jan 2017 14:01:05 +0800 Message-Id: <1484805686-7249-4-git-send-email-yi.y.sun@linux.intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1484805686-7249-1-git-send-email-yi.y.sun@linux.intel.com> References: <1484805686-7249-1-git-send-email-yi.y.sun@linux.intel.com> Cc: wei.liu2@citrix.com, konrad.wilk@oracle.com, andrew.cooper3@citrix.com, dario.faggioli@citrix.com, he.chen@linux.intel.com, ian.jackson@eu.citrix.com, Yi Sun , mengxu@cis.upenn.edu, jbeulich@suse.com, chao.p.peng@linux.intel.com Subject: [Xen-devel] [PATCH RESEND v5 03/24] x86: refactor psr: implement main data structures. X-BeenThere: xen-devel@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP To construct an extendible framework, we need analyze PSR features and abstract the common things and feature specific things. Then, encapsulate them into different data structures. By analyzing PSR features, we can get below map. +------+------+------+ --------->| Dom0 | Dom1 | ... | | +------+------+------+ | | |Dom ID | cos_id of domain | V | +-----------------------------------------------------------------------------+ User --------->| PSR | Socket ID | +--------------+---------------+---------------+ | | | Socket0 Info | Socket 1 Info | ... | | | +--------------+---------------+---------------+ | | | cos_id=0 cos_id=1 ... | | | +-----------------------+-----------------------+-----------+ | | |->Ref : | ref 0 | ref 1 | ... | | | | +-----------------------+-----------------------+-----------+ | | | +-----------------------+-----------------------+-----------+ | | |->L3 CAT: | cos 0 | cos 1 | ... | | | | +-----------------------+-----------------------+-----------+ | | | +-----------------------+-----------------------+-----------+ | | |->L2 CAT: | cos 0 | cos 1 | ... | | | | +-----------------------+-----------------------+-----------+ | | | +-----------+-----------+-----------+-----------+-----------+ | | |->CDP : | cos0 code | cos0 data | cos1 code | cos1 data | ... | | | +-----------+-----------+-----------+-----------+-----------+ | +-----------------------------------------------------------------------------+ So, we need define a socket info data structure, 'struct psr_socket_info' to manage information per socket. It contains a reference count array according to COS ID and a feature list to manage all features enabled. Every entry of the reference count array is used to record how many domains are using the COS registers according to the COS ID. For example, L3 CAT and L2 CAT are enabled, Dom1 uses COS_ID=1 registers of both features to save CBM values, like below. +-------+-------+-------+-----+ | COS 0 | COS 1 | COS 2 | ... | +-------+-------+-------+-----+ L3 CAT | 0x7ff | 0x1ff | ... | ... | +-------+-------+-------+-----+ L2 CAT | 0xff | 0xff | ... | ... | +-------+-------+-------+-----+ If Dom2 has same CBM values, it can reuse these registers which COS_ID=1. That means, both Dom1 and Dom2 use same COS registers(ID=1) to save same L3/L2 values. So, the value ref[1] is 2 which means 2 domains are using COS_ID 1. To manage a feature, we need define a feature node data structure, 'struct feat_node', to manage feature's specific HW info, its callback functions (all feature's specific behaviors are encapsulated into these callback functions), and an array of all COS registers values of this feature. CDP is a special feature which uses two entries of the array for one COS ID. So, the number of CDP COS registers is the half of L3 CAT. E.g. L3 CAT has 16 COS registers, then CDP has 8 COS registers if it is enabled. CDP uses the COS registers array as below. +-----------+-----------+-----------+-----------+-----------+ CDP cos_reg_val[] index: | 0 | 1 | 2 | 3 | ... | +-----------+-----------+-----------+-----------+-----------+ value: | cos0 code | cos0 data | cos1 code | cos1 data | ... | +-----------+-----------+-----------+-----------+-----------+ For more details, please refer spec and codes. Signed-off-by: Yi Sun --- v5: - explain CDP more in commit message. - remove exact SDM chapter number but only keep title. - remove init_feature from callback function ops structure. --- xen/arch/x86/psr.c | 104 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 104 insertions(+) diff --git a/xen/arch/x86/psr.c b/xen/arch/x86/psr.c index 96a8589..f7ff3fc 100644 --- a/xen/arch/x86/psr.c +++ b/xen/arch/x86/psr.c @@ -17,12 +17,116 @@ #include #include #include +#include #include +/* + * Terminology: + * - CAT Cache Allocation Technology + * - CBM Capacity BitMasks + * - CDP Code and Data Prioritization + * - COS/CLOS Class of Service. Also mean COS registers. + * - COS_MAX Max number of COS for the feature (minus 1) + * - MSRs Machine Specific Registers + * - PSR Intel Platform Shared Resource + */ + #define PSR_CMT (1<<0) #define PSR_CAT (1<<1) #define PSR_CDP (1<<2) +/* + * Per SDM chapter 'Cache Allocation Technology: Cache Mask Configuration', + * the MSRs range from 0C90H through 0D0FH (inclusive), enables support for + * up to 128 L3 CAT Classes of Service. The COS_ID=[0,127]. + * + * The MSRs range from 0D10H through 0D4FH (inclusive), enables support for + * up to 64 L2 CAT COS. The COS_ID=[0,63]. + * + * So, the maximum COS register count of one feature is 128. + */ +#define MAX_COS_REG_CNT 128 + +/* + * PSR features are managed per socket. Below structure defines the members + * used to manage these features. + * feat_mask - Mask used to record features enabled on socket. There may be + * some features enabled at same time. + * nr_feat - Record how many features enabled. + * feat_list - A list used to manage all features enabled. + * cos_ref - A reference count array to record how many domains are using the + * COS_ID. + * Every entry of cos_ref corresponds to one COS ID. + * ref_lock - A lock to protect cos_ref. + */ +struct psr_socket_info { + /* + * bit 0: L3 CAT + * bit 1: L3 CDP + * bit 2: L2 CAT + */ + unsigned int feat_mask; + unsigned int nr_feat; + struct list_head feat_list; + unsigned int cos_ref[MAX_COS_REG_CNT]; + spinlock_t ref_lock; +}; + +enum psr_feat_type { + PSR_SOCKET_L3_CAT = 0, + PSR_SOCKET_L3_CDP, + PSR_SOCKET_L2_CAT, +}; + +/* CAT/CDP HW info data structure. */ +struct psr_cat_hw_info { + unsigned int cbm_len; + unsigned int cos_max; +}; + +/* Encapsulate feature specific HW info here. */ +struct feat_hw_info { + union { + struct psr_cat_hw_info l3_cat_info; + }; +}; + +struct feat_node; + +/* + * This structure defines feature operation callback functions. Every feature + * enabled MUST implement such callback functions and register them to ops. + * + * Feature specific behaviors will be encapsulated into these callback + * functions. Then, the main flows will not be changed when introducing a new + * feature. + */ +struct feat_ops { + /* get_cos_max is used to get feature's cos_max. */ + unsigned int (*get_cos_max)(const struct feat_node *feat); +}; + +/* + * This structure represents one feature. + * feature - Which feature it is. + * feat_ops - Feature operation callback functions. + * info - Feature HW info. + * cos_reg_val - Array to store the values of COS registers. One entry stores + * the value of one COS register. + * For L3 CAT and L2 CAT, one entry corresponds to one COS_ID. + * For CDP, two entries correspond to one COS_ID. E.g. + * COS_ID=0 corresponds to cos_reg_val[0] (Data) and + * cos_reg_val[1] (Code). + * list - Feature list. + */ +struct feat_node { + enum psr_feat_type feature; + struct feat_ops ops; + struct feat_hw_info info; + uint64_t cos_reg_val[MAX_COS_REG_CNT]; + struct list_head list; +}; + struct psr_assoc { uint64_t val; uint64_t cos_mask;