From patchwork Wed Jun 14 01:12:42 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Sun X-Patchwork-Id: 9785127 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 3AB5A60384 for ; Wed, 14 Jun 2017 01:27:53 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2D22A26E75 for ; Wed, 14 Jun 2017 01:27:53 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 21C2428472; Wed, 14 Jun 2017 01:27:53 +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 8859526E75 for ; Wed, 14 Jun 2017 01:27:52 +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 1dKx44-0007VM-RC; Wed, 14 Jun 2017 01:25:44 +0000 Received: from mail6.bemta5.messagelabs.com ([195.245.231.135]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dKx43-0007Ts-AZ for xen-devel@lists.xenproject.org; Wed, 14 Jun 2017 01:25:43 +0000 Received: from [85.158.139.211] by server-11.bemta-5.messagelabs.com id 39/74-01733-69090495; Wed, 14 Jun 2017 01:25:42 +0000 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrALMWRWlGSWpSXmKPExsVywNykWHfyBId IgwePGC2+b5nM5MDocfjDFZYAxijWzLyk/IoE1ow7rQvZCibZV1yb/JWlgfGEbhcjF4eQwDRG iY2LOpi7GDk5JAR4JY4sm8EKYftJ/Pu3ghmiqIFRouX2L7AiNgF1icdfe5hAbBEBJYl7qyYzg RQxC+xkklh3+jtYkbBAvMScWZPZQGwWAVWJ8196wOK8Ap4SJw43s0FskJM4eWwy2DZOoHj362 dgQ4UEPCR+XpnKNIGRdwEjwypGjeLUorLUIl0jQ72kosz0jJLcxMwcXUMDU73c1OLixPTUnMS kYr3k/NxNjMCQqGdgYNzBeHey3yFGSQ4mJVHeJXYOkUJ8SfkplRmJxRnxRaU5qcWHGGU4OJQk eN/0AeUEi1LTUyvSMnOAwQmTluDgURLhrW0DSvMWFyTmFmemQ6ROMSpKifOeAukTAElklObBt cEi4hKjrJQwLyMDA4MQT0FqUW5mCar8K0ZxDkYlYd7j/UBTeDLzSuCmvwJazAS0+PoVG5DFJY kIKakGxk2mXp23LS9zNnhVsax8uHLDeW1BtSO9qjySmpHyy9WcP35IVGE9fVz2W85Kk27tL4k JpQcktwrETOg8XStwcP2ipXMP/nz7/7O3c9SC74futagfW3DMYlmhbcmWJ6p7dHvjTk+bIPGv U/vVO9VDXjLKUXqNd6YFme89zSDrnprmOavkrtR8dSWW4oxEQy3mouJEAAvML2eDAgAA X-Env-Sender: yi.y.sun@linux.intel.com X-Msg-Ref: server-16.tower-206.messagelabs.com!1497403511!87398197!10 X-Originating-IP: [192.55.52.115] X-SpamReason: No, hits=0.5 required=7.0 tests=BODY_RANDOM_LONG X-StarScan-Received: X-StarScan-Version: 9.4.19; banners=-,-,- X-VirusChecked: Checked Received: (qmail 48759 invoked from network); 14 Jun 2017 01:25:38 -0000 Received: from mga14.intel.com (HELO mga14.intel.com) (192.55.52.115) by server-16.tower-206.messagelabs.com with DHE-RSA-AES256-GCM-SHA384 encrypted SMTP; 14 Jun 2017 01:25:38 -0000 Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 13 Jun 2017 18:25:38 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.39,340,1493708400"; d="scan'208";a="99173880" Received: from vmmmba-s2600wft.bj.intel.com ([10.240.193.64]) by orsmga002.jf.intel.com with ESMTP; 13 Jun 2017 18:25:35 -0700 From: Yi Sun To: xen-devel@lists.xenproject.org Date: Wed, 14 Jun 2017 09:12:42 +0800 Message-Id: <1497402776-22348-10-git-send-email-yi.y.sun@linux.intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1497402776-22348-1-git-send-email-yi.y.sun@linux.intel.com> References: <1497402776-22348-1-git-send-email-yi.y.sun@linux.intel.com> Cc: kevin.tian@intel.com, wei.liu2@citrix.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, roger.pau@citrix.com Subject: [Xen-devel] [PATCH v12 09/23] x86: refactor psr: L3 CAT: set value: assemble features value array. 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 Only can one COS ID be used by one domain at one time. That means all enabled features' COS registers at this COS ID are valid for this domain at that time. When user updates a feature's value, we need make sure all other features' values are not affected. So, we firstly need gather an array which contains all features current values and replace the setting feature's value in array to new value. Then, we can try to find if there is a COS ID on which all features' COS registers values are same as the array. If we can find, we just use this COS ID. If fail to find, we need pick a new COS ID. This patch implements value array assembling flow. Signed-off-by: Yi Sun Reviewed-by: Jan Beulich --- v12: - use 'ARRAY_SIZE' to calculate array boundary. (suggested by Jan Beulich) - use 'ASSERT_UNREACHABLE()' to record bug and return error code if feat exist but props does not exist. (suggested by Jan Beulich) - return 0 only when value is set in 'insert_val_into_array'. (suggested by Jan Beulich) v11: - changes about 'feat_props'. (suggested by Jan Beulich) - changes about 'get_val'. It is replaced by generic codes. (suggested by Jan Beulich) v10: - remove 'get_old_val' to directly call 'get_val' to get needed val. (suggested by Jan Beulich) - move 'psr_check_cbm' into 'insert_val_to_array'. (suggested by Jan Beulich) - change type of 'cbm' in 'psr_check_cbm' to 'unsigned long'. (suggested by Jan Beulich) - remove 'set_new_val' as it can be handled in generic process. - changes related to 'feat_props'. (suggested by Jan Beulich) - adjust flow in 'gather_val_array' to avoid array cross. (suggested by Jan Beulich) - adjust flow in 'insert_val_to_array' to avoid array cross. (suggested by Jan Beulich) v9: - add comments about boundary checking. (suggested by Wei Liu) - rename 'assemble_val_array' to 'combine_val_array' in pervious patch. (suggested by Wei Liu) - rename 'l3_cat_get_cos_num' to 'cat_get_cos_num' to cover all L3/L2 CAT features. (suggested by Roger Pau) - rename 'l3_cat_get_old_val' to 'cat_get_old_val' to cover all L3/L2 CAT features and reuse cat_get_val in it. (suggested by Roger Pau) - replace feature list handling to feature array handling. (suggested by Roger Pau) - modify patch title to indicate 'L3 CAT'. (suggested by Jan Beulich) - replace 'm' to 'new_val'. (suggested by Jan Beulich) - move cos check outside callback function. (suggested by Jan Beulich) - remove 'get_cos_num' callback function. (suggested by Jan Beulich) - changes about 'uint64_t' to 'uint32_t'. (suggested by Jan Beulich) v6: - change 'assemble_val_array' to 'combine_val_array'. (suggested by Konrad Rzeszutek Wilk) - check return value of 'get_old_val'. (suggested by Konrad Rzeszutek Wilk) - replace some 'EINVAL' to 'ENOSPC'. (suggested by Konrad Rzeszutek Wilk) v5: - modify comments according to changes of codes. (suggested by Jan Beulich) - change 'bool_t' to 'bool'. (suggested by Jan Beulich) - modify return value of callback functions because we do not need them to return number of entries the feature uses. In caller, we call 'get_cos_num' to get the number of entries the feature uses. (suggested by Jan Beulich) - modify variables names to make them better, e.g. 'feat_tmp' to 'feat'. (suggested by Jan Beulich) v4: - create this patch to make codes easier to understand. (suggested by Jan Beulich) --- --- xen/arch/x86/psr.c | 128 ++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 126 insertions(+), 2 deletions(-) diff --git a/xen/arch/x86/psr.c b/xen/arch/x86/psr.c index fb84223..70e7c41 100644 --- a/xen/arch/x86/psr.c +++ b/xen/arch/x86/psr.c @@ -204,6 +204,29 @@ static enum psr_feat_type psr_cbm_type_to_feat_type(enum cbm_type type) return feat_type; } +static bool psr_check_cbm(unsigned int cbm_len, unsigned long cbm) +{ + unsigned int first_bit, zero_bit; + + /* Set bits should only in the range of [0, cbm_len]. */ + if ( cbm & (~0ul << cbm_len) ) + return false; + + /* At least one bit need to be set. */ + if ( cbm == 0 ) + return false; + + first_bit = find_first_bit(&cbm, cbm_len); + zero_bit = find_next_zero_bit(&cbm, cbm_len, first_bit); + + /* Set bits should be contiguous. */ + if ( zero_bit < cbm_len && + find_next_bit(&cbm, cbm_len, zero_bit) < cbm_len ) + return false; + + return true; +} + /* CAT common functions implementation. */ static void cat_init_feature(const struct cpuid_leaf *regs, struct feat_node *feat, @@ -592,7 +615,14 @@ int psr_get_val(struct domain *d, unsigned int socket, /* Set value functions */ static unsigned int get_cos_num(const struct psr_socket_info *info) { - return 0; + unsigned int num = 0, i; + + /* Get all features total amount. */ + for ( i = 0; i < ARRAY_SIZE(feat_props); i++ ) + if ( feat_props[i] ) + num += feat_props[i]->cos_num; + + return num; } static int gather_val_array(uint32_t val[], @@ -600,7 +630,47 @@ static int gather_val_array(uint32_t val[], const struct psr_socket_info *info, unsigned int old_cos) { - return -EINVAL; + unsigned int i; + + if ( !val ) + return -EINVAL; + + /* Get all features current values according to old_cos. */ + for ( i = 0; i < ARRAY_SIZE(info->features); i++ ) + { + unsigned int cos = old_cos, j; + const struct feat_node *feat = info->features[i]; + const struct feat_props *props = feat_props[i]; + + if ( !feat ) + continue; + + if ( !props ) + { + ASSERT_UNREACHABLE(); + return -ENOENT; + } + + if ( array_len < props->cos_num ) + return -ENOSPC; + + /* + * If old_cos exceeds current feature's cos_max, we should get + * default value. So assign cos to 0 which stores default value. + */ + if ( cos > feat->cos_max ) + cos = 0; + + /* Value getting order is same as feature array. */ + for ( j = 0; j < props->cos_num; j++ ) + val[j] = feat->cos_reg_val[cos * props->cos_num + j]; + + array_len -= props->cos_num; + + val += props->cos_num; + } + + return 0; } static int insert_val_into_array(uint32_t val[], @@ -610,6 +680,60 @@ static int insert_val_into_array(uint32_t val[], enum cbm_type type, uint32_t new_val) { + const struct feat_node *feat; + const struct feat_props *props; + unsigned int i; + + ASSERT(feat_type < PSR_SOCKET_FEAT_NUM); + + /* Insert new value into array according to feature's position in array. */ + for ( i = 0; i < feat_type; i++ ) + { + if ( !info->features[i] ) + continue; + + props = feat_props[i]; + if ( !props ) + { + ASSERT_UNREACHABLE(); + return -ENOENT; + } + + if ( array_len <= props->cos_num ) + return -ENOSPC; + + array_len -= props->cos_num; + + val += props->cos_num; + } + + feat = info->features[feat_type]; + if ( !feat ) + return -ENOENT; + + props = feat_props[feat_type]; + if ( !props ) + { + ASSERT_UNREACHABLE(); + return -ENOENT; + } + + if ( array_len < props->cos_num ) + return -ENOSPC; + + if ( !psr_check_cbm(feat->cbm_len, new_val) ) + return -EINVAL; + + /* Value setting position is same as feature array. */ + for ( i = 0; i < props->cos_num; i++ ) + { + if ( type == props->type[i] ) + { + val[i] = new_val; + return 0; + } + } + return -EINVAL; }