From patchwork Tue May 31 15:26:28 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ira Weiny X-Patchwork-Id: 12865859 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 3C69AC433EF for ; Tue, 31 May 2022 15:27:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345670AbiEaP1C (ORCPT ); Tue, 31 May 2022 11:27:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60912 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345661AbiEaP1A (ORCPT ); Tue, 31 May 2022 11:27:00 -0400 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 089F0340CC; Tue, 31 May 2022 08:26:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1654010819; x=1685546819; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=rcNTwAa7X3jipQSCHWmsrscA8EJ7zx/NTTc5WfPGrag=; b=RKOXUU3XOIjgMEqqoIva5/8p6HPRL5pK2mtTpF9qFMqWruKKda+z3F4g uVorPBplxMREdILz0UE3SUTCaedGfbOjG9sNIkIyP1KnhsqzuLmaQYRvt b3kWPvGQyit6V20hkNIHD+fauvu+hQ6cF4Ftyte2zzy3GRrvspcor/3kL GbTt78OEh/yJL7XA3WM1H5C6Eoaanqv8zpkYLlBXzEBScrM2F1egtaBkK 8iYzPTwA5eQtGnlgZmiGzXB8CGyd7I71YxItfYAxEjn5UZ5IY3DBnLe84 enV/9FiNQVaEEPMACqcauYIWLxA1BFZiXJNikd2rM7Z88/9PoneDjr2X1 A==; X-IronPort-AV: E=McAfee;i="6400,9594,10364"; a="300640592" X-IronPort-AV: E=Sophos;i="5.91,265,1647327600"; d="scan'208";a="300640592" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 May 2022 08:26:58 -0700 X-IronPort-AV: E=Sophos;i="5.91,265,1647327600"; d="scan'208";a="679629038" Received: from mdossant-mobl1.amr.corp.intel.com (HELO localhost) ([10.212.154.135]) by fmsmga002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 May 2022 08:26:57 -0700 From: ira.weiny@intel.com To: Dan Williams , Bjorn Helgaas , Jonathan Cameron Cc: Alison Schofield , Vishal Verma , Ira Weiny , Dave Jiang , Ben Widawsky , linux-kernel@vger.kernel.org, linux-cxl@vger.kernel.org, linux-pci@vger.kernel.org Subject: [PATCH V9 5/9] cxl/port: Find a DOE mailbox which supports CDAT Date: Tue, 31 May 2022 08:26:28 -0700 Message-Id: <20220531152632.1397976-6-ira.weiny@intel.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220531152632.1397976-1-ira.weiny@intel.com> References: <20220531152632.1397976-1-ira.weiny@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Ira Weiny Each CXL device may have multiple DOE mailbox capabilities and each mailbox may support multiple protocols. CXL port devices need to query the CDAT information specifically. Search the DOE mailboxes for one which supports the CDAT protocol. Cache that mailbox to be used for future queries. Only support memory devices at this time. Signed-off-by: Ira Weiny --- Changes from V8 Incorporate feedback from Jonathan Move all this to the cxl_port object Changes from V7 Minor code clean ups Changes from V6 Adjust for aux devices being a CXL only concept Update commit msg. Ensure devices iterated by auxiliary_find_device() are checked to be DOE devices prior to checking for the CDAT protocol From Ben Ensure reference from auxiliary_find_device() is dropped --- drivers/cxl/core/pci.c | 28 ++++++++++++++++++++++++++++ drivers/cxl/core/port.c | 2 ++ drivers/cxl/cxl.h | 2 ++ drivers/cxl/cxlpci.h | 1 + 4 files changed, 33 insertions(+) diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c index c4c99ff7b55e..5497a65bdcf3 100644 --- a/drivers/cxl/core/pci.c +++ b/drivers/cxl/core/pci.c @@ -4,11 +4,14 @@ #include #include #include +#include #include #include #include #include "core.h" +#define CXL_DOE_PROTOCOL_TABLE_ACCESS 2 + /** * DOC: cxl core pci * @@ -458,3 +461,28 @@ int cxl_hdm_decode_init(struct cxl_dev_state *cxlds, struct cxl_hdm *cxlhdm) return 0; } EXPORT_SYMBOL_NS_GPL(cxl_hdm_decode_init, CXL); + +void cxl_find_cdat_mb(struct cxl_port *port) +{ + struct device *dev = port->uport; + struct cxl_memdev *cxlmd; + struct cxl_dev_state *cxlds; + int i; + + if (!is_cxl_memdev(dev)) + return; + + cxlmd = to_cxl_memdev(dev); + cxlds = cxlmd->cxlds; + + for (i = 0; i < cxlds->num_mbs; i++) { + struct pci_doe_mb *cur = cxlds->doe_mbs[i]; + + if (pci_doe_supports_prot(cur, PCI_DVSEC_VENDOR_ID_CXL, + CXL_DOE_PROTOCOL_TABLE_ACCESS)) { + port->cdat_mb = cur; + return; + } + } +} +EXPORT_SYMBOL_NS_GPL(cxl_find_cdat_mb, CXL); diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index ea60abda6500..2e2bd65c1024 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -461,6 +461,8 @@ struct cxl_port *devm_cxl_add_port(struct device *host, struct device *uport, if (IS_ERR(port)) return port; + cxl_find_cdat_mb(port); + dev = &port->dev; if (is_cxl_memdev(uport)) rc = dev_set_name(dev, "endpoint%d", port->id); diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 140dc3278cde..0a86be589ffc 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -267,6 +267,7 @@ struct cxl_nvdimm { * @component_reg_phys: component register capability base address (optional) * @dead: last ep has been removed, force port re-creation * @depth: How deep this port is relative to the root. depth 0 is the root. + * @cdat_mb: Mailbox which supports the CDAT protocol */ struct cxl_port { struct device dev; @@ -278,6 +279,7 @@ struct cxl_port { resource_size_t component_reg_phys; bool dead; unsigned int depth; + struct pci_doe_mb *cdat_mb; }; /** diff --git a/drivers/cxl/cxlpci.h b/drivers/cxl/cxlpci.h index fce1c11729c2..366b21bd1a01 100644 --- a/drivers/cxl/cxlpci.h +++ b/drivers/cxl/cxlpci.h @@ -74,4 +74,5 @@ static inline resource_size_t cxl_regmap_to_base(struct pci_dev *pdev, int devm_cxl_port_enumerate_dports(struct cxl_port *port); struct cxl_dev_state; int cxl_hdm_decode_init(struct cxl_dev_state *cxlds, struct cxl_hdm *cxlhdm); +void cxl_find_cdat_mb(struct cxl_port *port); #endif /* __CXL_PCI_H__ */