From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3zqx9Z2yRgzF0sw for ; Tue, 27 Feb 2018 09:20:50 +1100 (AEDT) Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w1QMJkAD012078 for ; Mon, 26 Feb 2018 17:20:47 -0500 Received: from e11.ny.us.ibm.com (e11.ny.us.ibm.com [129.33.205.201]) by mx0b-001b2d01.pphosted.com with ESMTP id 2gct6p9nsb-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Mon, 26 Feb 2018 17:20:46 -0500 Received: from localhost by e11.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 26 Feb 2018 17:20:46 -0500 From: Uma Krishnan To: linux-scsi@vger.kernel.org, James Bottomley , "Martin K. Petersen" , "Matthew R. Ochs" , "Manoj N. Kumar" Cc: linuxppc-dev@lists.ozlabs.org, Andrew Donnellan , Frederic Barrat , Christophe Lombard Subject: [PATCH v2 06/38] cxlflash: Read host function configuration Date: Mon, 26 Feb 2018 16:20:41 -0600 In-Reply-To: <1519683513-16731-1-git-send-email-ukrishn@linux.vnet.ibm.com> References: <1519683513-16731-1-git-send-email-ukrishn@linux.vnet.ibm.com> Message-Id: <1519683641-16967-1-git-send-email-ukrishn@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Per the OCXL specification, the underlying host can have multiple AFUs per function with each function supporting its own configuration. The host function configuration is read on the initialization path to evaluate the number of functions present and identify the features and configuration of the functions present. This data is cached for use in later configuration steps. Note that for the OCXL hardware supported by the cxlflash driver, only one AFU per function is expected. Signed-off-by: Uma Krishnan Acked-by: Matthew R. Ochs --- drivers/scsi/cxlflash/ocxl_hw.c | 41 +++++++++++++++++++++++++++++++++++++++++ drivers/scsi/cxlflash/ocxl_hw.h | 2 ++ 2 files changed, 43 insertions(+) diff --git a/drivers/scsi/cxlflash/ocxl_hw.c b/drivers/scsi/cxlflash/ocxl_hw.c index e3a0a9b..dc32a73 100644 --- a/drivers/scsi/cxlflash/ocxl_hw.c +++ b/drivers/scsi/cxlflash/ocxl_hw.c @@ -32,6 +32,35 @@ static void ocxlflash_destroy_afu(void *afu_cookie) } /** + * ocxlflash_config_fn() - configure the host function + * @pdev: PCI device associated with the host. + * @afu: AFU associated with the host. + * + * Return: 0 on success, -errno on failure + */ +static int ocxlflash_config_fn(struct pci_dev *pdev, struct ocxl_hw_afu *afu) +{ + struct ocxl_fn_config *fcfg = &afu->fcfg; + struct device *dev = &pdev->dev; + int rc = 0; + + /* Read DVSEC config of the function */ + rc = ocxl_config_read_function(pdev, fcfg); + if (unlikely(rc)) { + dev_err(dev, "%s: ocxl_config_read_function failed rc=%d\n", + __func__, rc); + goto out; + } + + /* Only one AFU per function is supported by ocxlflash */ + if (fcfg->max_afu_index != 0) + dev_warn(dev, "%s: Unexpected AFU index value %d\n", + __func__, fcfg->max_afu_index); +out: + return rc; +} + +/** * ocxlflash_create_afu() - create the AFU for OCXL * @pdev: PCI device associated with the host. * @@ -41,6 +70,7 @@ static void *ocxlflash_create_afu(struct pci_dev *pdev) { struct device *dev = &pdev->dev; struct ocxl_hw_afu *afu; + int rc; afu = kzalloc(sizeof(*afu), GFP_KERNEL); if (unlikely(!afu)) { @@ -50,8 +80,19 @@ static void *ocxlflash_create_afu(struct pci_dev *pdev) afu->pdev = pdev; afu->dev = dev; + + rc = ocxlflash_config_fn(pdev, afu); + if (unlikely(rc)) { + dev_err(dev, "%s: Function configuration failed rc=%d\n", + __func__, rc); + goto err1; + } out: return afu; +err1: + kfree(afu); + afu = NULL; + goto out; } /* Backend ops to ocxlflash services */ diff --git a/drivers/scsi/cxlflash/ocxl_hw.h b/drivers/scsi/cxlflash/ocxl_hw.h index c7e5c4d..658f420 100644 --- a/drivers/scsi/cxlflash/ocxl_hw.h +++ b/drivers/scsi/cxlflash/ocxl_hw.h @@ -16,4 +16,6 @@ struct ocxl_hw_afu { struct pci_dev *pdev; /* PCI device */ struct device *dev; /* Generic device */ + + struct ocxl_fn_config fcfg; /* DVSEC config of the function */ }; -- 2.1.0