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Violators will be prosecuted for from ; Mon, 26 Mar 2018 12:31:58 -0400 Received: from b01cxnp23034.gho.pok.ibm.com (9.57.198.29) by e13.ny.us.ibm.com (146.89.104.200) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; Mon, 26 Mar 2018 12:31:55 -0400 Received: from b01ledav001.gho.pok.ibm.com (b01ledav001.gho.pok.ibm.com [9.57.199.106]) by b01cxnp23034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w2QGVt2k51708064; Mon, 26 Mar 2018 16:31:55 GMT Received: from b01ledav001.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E392D2803D; Mon, 26 Mar 2018 12:31:18 -0400 (EDT) Received: from p8tul1-build.aus.stglabs.ibm.com (unknown [9.3.141.206]) by b01ledav001.gho.pok.ibm.com (Postfix) with ESMTP id 430122803A; Mon, 26 Mar 2018 12:31:18 -0400 (EDT) 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 v3 11/41] cxlflash: Adapter context support for OCXL Date: Mon, 26 Mar 2018 11:31:53 -0500 X-Mailer: git-send-email 2.1.0 In-Reply-To: <1522081759-57431-1-git-send-email-ukrishn@linux.vnet.ibm.com> References: <1522081759-57431-1-git-send-email-ukrishn@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18032616-0008-0000-0000-000002EB0BE9 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00008748; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000255; SDB=6.01008739; UDB=6.00513806; IPR=6.00788021; MB=3.00020251; MTD=3.00000008; XFM=3.00000015; UTC=2018-03-26 16:31:57 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18032616-0009-0000-0000-000038AF9BA6 Message-Id: <1522081913-57858-1-git-send-email-ukrishn@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2018-03-26_07:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1803260169 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add support to create and release the adapter contexts for OCXL and provide means to specify certain contexts as a master. The existing cxlflash core has a design requirement that each host will have a single host context available by default. To satisfy this requirement, one host adapter context is created when the hardware AFU is initialized. This is returned by the get_context() fop. Signed-off-by: Uma Krishnan Acked-by: Matthew R. Ochs Reviewed-by: Frederic Barrat --- drivers/scsi/cxlflash/ocxl_hw.c | 90 +++++++++++++++++++++++++++++++++++++++++ drivers/scsi/cxlflash/ocxl_hw.h | 6 +++ 2 files changed, 96 insertions(+) diff --git a/drivers/scsi/cxlflash/ocxl_hw.c b/drivers/scsi/cxlflash/ocxl_hw.c index 44688af..cbe4d93 100644 --- a/drivers/scsi/cxlflash/ocxl_hw.c +++ b/drivers/scsi/cxlflash/ocxl_hw.c @@ -18,6 +18,80 @@ #include "ocxl_hw.h" /** + * ocxlflash_set_master() - sets the context as master + * @ctx_cookie: Adapter context to set as master. + */ +static void ocxlflash_set_master(void *ctx_cookie) +{ + struct ocxlflash_context *ctx = ctx_cookie; + + ctx->master = true; +} + +/** + * ocxlflash_get_context() - obtains the context associated with the host + * @pdev: PCI device associated with the host. + * @afu_cookie: Hardware AFU associated with the host. + * + * Return: returns the pointer to host adapter context + */ +static void *ocxlflash_get_context(struct pci_dev *pdev, void *afu_cookie) +{ + struct ocxl_hw_afu *afu = afu_cookie; + + return afu->ocxl_ctx; +} + +/** + * ocxlflash_dev_context_init() - allocate and initialize an adapter context + * @pdev: PCI device associated with the host. + * @afu_cookie: Hardware AFU associated with the host. + * + * Return: returns the adapter context on success, ERR_PTR on failure + */ +static void *ocxlflash_dev_context_init(struct pci_dev *pdev, void *afu_cookie) +{ + struct ocxl_hw_afu *afu = afu_cookie; + struct device *dev = afu->dev; + struct ocxlflash_context *ctx; + int rc; + + ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); + if (unlikely(!ctx)) { + dev_err(dev, "%s: Context allocation failed\n", __func__); + rc = -ENOMEM; + goto err; + } + + ctx->master = false; + ctx->hw_afu = afu; +out: + return ctx; +err: + ctx = ERR_PTR(rc); + goto out; +} + +/** + * ocxlflash_release_context() - releases an adapter context + * @ctx_cookie: Adapter context to be released. + * + * Return: 0 on success, -errno on failure + */ +static int ocxlflash_release_context(void *ctx_cookie) +{ + struct ocxlflash_context *ctx = ctx_cookie; + int rc = 0; + + if (!ctx) + goto out; + + kfree(ctx); +out: + return rc; +} + +/** * ocxlflash_destroy_afu() - destroy the AFU structure * @afu_cookie: AFU to be freed. */ @@ -28,6 +102,7 @@ static void ocxlflash_destroy_afu(void *afu_cookie) if (!afu) return; + ocxlflash_release_context(afu->ocxl_ctx); kfree(afu); } @@ -134,6 +209,7 @@ static int ocxlflash_config_afu(struct pci_dev *pdev, struct ocxl_hw_afu *afu) static void *ocxlflash_create_afu(struct pci_dev *pdev) { struct device *dev = &pdev->dev; + struct ocxlflash_context *ctx; struct ocxl_hw_afu *afu; int rc; @@ -159,6 +235,16 @@ static void *ocxlflash_create_afu(struct pci_dev *pdev) __func__, rc); goto err1; } + + ctx = ocxlflash_dev_context_init(pdev, afu); + if (IS_ERR(ctx)) { + rc = PTR_ERR(ctx); + dev_err(dev, "%s: ocxlflash_dev_context_init failed rc=%d\n", + __func__, rc); + goto err1; + } + + afu->ocxl_ctx = ctx; out: return afu; err1: @@ -170,6 +256,10 @@ static void *ocxlflash_create_afu(struct pci_dev *pdev) /* Backend ops to ocxlflash services */ const struct cxlflash_backend_ops cxlflash_ocxl_ops = { .module = THIS_MODULE, + .set_master = ocxlflash_set_master, + .get_context = ocxlflash_get_context, + .dev_context_init = ocxlflash_dev_context_init, + .release_context = ocxlflash_release_context, .create_afu = ocxlflash_create_afu, .destroy_afu = ocxlflash_destroy_afu, }; diff --git a/drivers/scsi/cxlflash/ocxl_hw.h b/drivers/scsi/cxlflash/ocxl_hw.h index 46de75b..f41ba0b 100644 --- a/drivers/scsi/cxlflash/ocxl_hw.h +++ b/drivers/scsi/cxlflash/ocxl_hw.h @@ -14,6 +14,7 @@ /* OCXL hardware AFU associated with the host */ struct ocxl_hw_afu { + struct ocxlflash_context *ocxl_ctx; /* Host context */ struct pci_dev *pdev; /* PCI device */ struct device *dev; /* Generic device */ @@ -28,3 +29,8 @@ struct ocxl_hw_afu { int max_pasid; /* Maximum number of contexts */ bool is_present; /* Function has AFUs defined */ }; + +struct ocxlflash_context { + struct ocxl_hw_afu *hw_afu; /* HW AFU back pointer */ + bool master; /* Whether this is a master context */ +};