From patchwork Fri May 19 17:07:10 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dave Jiang X-Patchwork-Id: 13248646 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C430FC7EE39 for ; Fri, 19 May 2023 17:10:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230423AbjESRJe (ORCPT ); Fri, 19 May 2023 13:09:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51868 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232052AbjESRJ1 (ORCPT ); Fri, 19 May 2023 13:09:27 -0400 Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 80F821A1 for ; Fri, 19 May 2023 10:09:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1684516154; x=1716052154; h=subject:from:to:cc:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=HQE7u7MtWpYtQfOgdXuDYgh4z8uJ6pdIS40kuv+tT/I=; b=aH32AkGnvo8cqYMjYc06fIO+sXZ2z27xEJmclTGWFBXvfaipG2pI4FPE tHQ/a4AAQmvetCB8b54OIn1sghLAJIWHY6Ph0hEHtNV5YZc+j8qGrG3sR 8ALu+YNttvWAoK41skHIeuxV6R7aMzfX5aT4kmGoDcue9+dtwOeFfNYiF BX29hILq0uZYcFE6WjlQJ14rTtLgTawHE4VaEo2BUP441JVtau0DWoG2g /cXXsnAgRp/F0HPBO0h96nUabgXeYdRbfNxTDgu9G9hDjuovc0EB/9cT9 ruPGnx/TMpIPB+3K8tkVocgOL8mrDMu6sVoBrMzTmjSSYpYh/ybOukEKg Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10715"; a="438778326" X-IronPort-AV: E=Sophos;i="6.00,177,1681196400"; d="scan'208";a="438778326" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 May 2023 10:07:11 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10715"; a="876911011" X-IronPort-AV: E=Sophos;i="6.00,177,1681196400"; d="scan'208";a="876911011" Received: from djiang5-mobl3.amr.corp.intel.com (HELO [192.168.1.177]) ([10.212.29.189]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 May 2023 10:07:10 -0700 Subject: [PATCH v6 06/11] cxl: Store the access coordinates for the generic ports From: Dave Jiang To: linux-cxl@vger.kernel.org Cc: dan.j.williams@intel.com, ira.weiny@intel.com, vishal.l.verma@intel.com, alison.schofield@intel.com, Jonathan.Cameron@huawei.com Date: Fri, 19 May 2023 10:07:10 -0700 Message-ID: <168451603029.3470703.13447576080193633262.stgit@djiang5-mobl3> In-Reply-To: <168451588868.3470703.3527256859632103687.stgit@djiang5-mobl3> References: <168451588868.3470703.3527256859632103687.stgit@djiang5-mobl3> User-Agent: StGit/1.5 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cxl@vger.kernel.org Each CXL host bridge is represented by an ACPI0016 device. A generic port device handle that is an ACPI device is represented by a string of ACPI0016 device HID and UID. Create a device handle from the ACPI device and retrieve the access coordinates from the stored memory targets. The access coordinates are stored under the cxl_dport that is associated with the CXL host bridge. The access coordinates struct is dynamically allocated under cxl_dport in order for code later on to detect whether the data exists or not. Signed-off-by: Dave Jiang Reviewed-by: Jonathan Cameron --- v6: - Change memcpy to strncpy. ACPI HID and UID are strings. --- drivers/cxl/acpi.c | 22 ++++++++++++++++++++++ drivers/cxl/cxl.h | 2 ++ 2 files changed, 24 insertions(+) diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c index 8247df06d683..0c22cc9dbcba 100644 --- a/drivers/cxl/acpi.c +++ b/drivers/cxl/acpi.c @@ -557,8 +557,26 @@ static int cxl_get_chbcr(union acpi_subtable_headers *header, void *arg, return 0; } +static int get_genport_coordinates(struct device *dev, struct cxl_dport *dport) +{ + struct acpi_device *hb = to_cxl_host_bridge(NULL, dev); + u8 handle[ACPI_SRAT_DEVICE_HANDLE_SIZE] = { 0 }; + int rc; + + /* ACPI spec 6.5 table 5.65 */ + strncpy(handle, acpi_device_hid(hb), 8); + strncpy(&handle[8], acpi_device_uid(hb), 4); + + rc = acpi_get_genport_coordinates(handle, &dport->hb_access); + if (rc) + return rc; + + return 0; +} + static int add_host_bridge_dport(struct device *match, void *arg) { + int ret; acpi_status rc; struct device *bridge; unsigned long long uid; @@ -614,6 +632,10 @@ static int add_host_bridge_dport(struct device *match, void *arg) if (IS_ERR(dport)) return PTR_ERR(dport); + ret = get_genport_coordinates(match, dport); + if (ret) + dev_dbg(match, "Failed to get generic port perf coordinates.\n"); + return 0; } diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 3d0c8c63f6d6..2369e91add63 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -636,6 +636,7 @@ cxl_find_dport_by_dev(struct cxl_port *port, const struct device *dport_dev) * @rcrb: base address for the Root Complex Register Block * @rch: Indicate whether this dport was enumerated in RCH or VH mode * @port: reference to cxl_port that contains this downstream port + * @genport_coord: access coordinates (performance) from ACPI generic port * @coord: access coordinates (performance) for switch from CDAT * @link_latency: calculated PCIe downstream latency */ @@ -646,6 +647,7 @@ struct cxl_dport { resource_size_t rcrb; bool rch; struct cxl_port *port; + struct access_coordinate hb_access; struct access_coordinate coord; long link_latency; };