From patchwork Mon Feb 6 20:51:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dave Jiang X-Patchwork-Id: 13130587 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 6CC43C636D4 for ; Mon, 6 Feb 2023 20:51:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230397AbjBFUvf (ORCPT ); Mon, 6 Feb 2023 15:51:35 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49106 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230263AbjBFUve (ORCPT ); Mon, 6 Feb 2023 15:51:34 -0500 Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 25D8E1DBB8; Mon, 6 Feb 2023 12:51:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1675716691; x=1707252691; h=subject:from:to:cc:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=uQRUC8QEU+C+pD79WhvBKGvAFobEMV5CpOt5lEMC6XE=; b=TWv2Ml5pc/B1KK6PJ9q/w0wT+BP/o/v1oYxmM/HxwTexFlQcFzkrTR9S Qk4vNihB7ZQq+vOKprUokQDMhIcCcEmNTK8wtahIDMUX74NdPDMO+VfRZ 1xHzd8w/Oe+m+t/RJ1cqbi5skslKXM0QN/1wl1O87Bs4fdbv37uvM2sLq dVTNXYRfikoue7fc8pW09wkdEF9lLhrHY57ec1WrCJufNiTl6teY3GXoZ gPgpyDzyAh6lKMDL1Zm/gGUeqzb/74L+X7lPAAqJ5WDzvnTQsvjMhk0bk gABLIlx8a6W3fWDmDdp/7KQFczMkpogkD5rvn1LiztuE1nk+jPZ/dONaJ g==; X-IronPort-AV: E=McAfee;i="6500,9779,10613"; a="308958787" X-IronPort-AV: E=Sophos;i="5.97,276,1669104000"; d="scan'208";a="308958787" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Feb 2023 12:51:30 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10613"; a="735280218" X-IronPort-AV: E=Sophos;i="5.97,276,1669104000"; d="scan'208";a="735280218" Received: from djiang5-mobl3.amr.corp.intel.com (HELO djiang5-mobl3.local) ([10.212.111.195]) by fmsmga004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Feb 2023 12:51:30 -0800 Subject: [PATCH 14/18] cxl: Wait Memory_Info_Valid before access memory related info From: Dave Jiang To: linux-cxl@vger.kernel.org, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org Cc: dan.j.williams@intel.com, ira.weiny@intel.com, vishal.l.verma@intel.com, alison.schofield@intel.com, rafael@kernel.org, bhelgaas@google.com, robert.moore@intel.com Date: Mon, 06 Feb 2023 13:51:28 -0700 Message-ID: <167571668726.587790.16814881883553586342.stgit@djiang5-mobl3.local> In-Reply-To: <167571650007.587790.10040913293130712882.stgit@djiang5-mobl3.local> References: <167571650007.587790.10040913293130712882.stgit@djiang5-mobl3.local> User-Agent: StGit/1.5 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org CXL rev3.0 8.1.3.8.2 Memory_Info_valid field The Memory_Info_Valid bit indicates that the CXL Range Size High and Size Low registers are valid. The bit must be set within 1 second of reset deassertion to the device. Check valid bit before we check the Memory_Active bit when waiting for cxl_await_media_ready() to ensure that the memory info is valid for consumption. Signed-off-by: Dave Jiang --- drivers/cxl/core/pci.c | 25 +++++++++++++++++++++++-- drivers/cxl/port.c | 20 ++++++++++---------- 2 files changed, 33 insertions(+), 12 deletions(-) diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c index 54ac6f8825ff..79a1348e7b98 100644 --- a/drivers/cxl/core/pci.c +++ b/drivers/cxl/core/pci.c @@ -111,11 +111,32 @@ int cxl_await_media_ready(struct cxl_dev_state *cxlds) int d = cxlds->cxl_dvsec; bool active = false; u64 md_status; + u32 temp; int rc, i; - for (i = media_ready_timeout; i; i--) { - u32 temp; + /* Check MEM INFO VALID bit first, give up after 1s */ + i = 1; + do { + rc = pci_read_config_dword(pdev, + d + CXL_DVSEC_RANGE_SIZE_LOW(0), + &temp); + if (rc) + return rc; + active = FIELD_GET(CXL_DVSEC_MEM_INFO_VALID, temp); + if (active) + break; + msleep(1000); + } while (i--); + + if (!active) { + dev_err(&pdev->dev, + "timeout awaiting memory valid after 1 second.\n"); + return -ETIMEDOUT; + } + + /* Check MEM ACTIVE bit, up to 60s timeout by default */ + for (i = media_ready_timeout; i; i--) { rc = pci_read_config_dword( pdev, d + CXL_DVSEC_RANGE_SIZE_LOW(0), &temp); if (rc) diff --git a/drivers/cxl/port.c b/drivers/cxl/port.c index d72e38f9ae44..03380c18fc52 100644 --- a/drivers/cxl/port.c +++ b/drivers/cxl/port.c @@ -99,6 +99,16 @@ static int cxl_port_probe(struct device *dev) if (rc) return rc; + rc = cxl_hdm_decode_init(cxlds, cxlhdm); + if (rc) + return rc; + + rc = cxl_await_media_ready(cxlds); + if (rc) { + dev_err(dev, "Media not active (%d)\n", rc); + return rc; + } + if (port->cdat.table) { rc = cdat_table_parse_dsmas(port->cdat.table, cxl_dsmas_parse_entry, @@ -117,16 +127,6 @@ static int cxl_port_probe(struct device *dev) if (rc) dev_dbg(dev, "Failed to do QoS calculations\n"); } - - rc = cxl_hdm_decode_init(cxlds, cxlhdm); - if (rc) - return rc; - - rc = cxl_await_media_ready(cxlds); - if (rc) { - dev_err(dev, "Media not active (%d)\n", rc); - return rc; - } } rc = devm_cxl_enumerate_decoders(cxlhdm);