From patchwork Thu Jun 24 20:53:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Russ Weight X-Patchwork-Id: 12343215 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 27DABC49EAB for ; Thu, 24 Jun 2021 20:54:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 11995613C3 for ; Thu, 24 Jun 2021 20:54:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229525AbhFXU44 (ORCPT ); Thu, 24 Jun 2021 16:56:56 -0400 Received: from mga14.intel.com ([192.55.52.115]:13252 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232300AbhFXU4y (ORCPT ); Thu, 24 Jun 2021 16:56:54 -0400 IronPort-SDR: mjqq4aA5xXmrsviaqBybx5TKQo5SpS3Vtl8mnRZSCyJHjjUIpr8wZ/uu3pY4Fk0oQnwFjGubvm kp3fW/j8EhEQ== X-IronPort-AV: E=McAfee;i="6200,9189,10025"; a="207376320" X-IronPort-AV: E=Sophos;i="5.83,297,1616482800"; d="scan'208";a="207376320" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Jun 2021 13:54:34 -0700 IronPort-SDR: xeHhdPP5WuTW15tDwW+dHqjAddbxwAPc/DiNwCEHxE2Ln456LXlxkD1zYRc8cflXwrWWLh6iPK 5WrHWcMv2BQg== X-IronPort-AV: E=Sophos;i="5.83,297,1616482800"; d="scan'208";a="624306698" Received: from rhweight-mobl2.amr.corp.intel.com (HELO rhweight-mobl2.ra.intel.com) ([10.209.11.192]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Jun 2021 13:54:34 -0700 From: Russ Weight To: mdf@kernel.org, linux-fpga@vger.kernel.org Cc: trix@redhat.com, lgoncalv@redhat.com, yilun.xu@intel.com, hao.wu@intel.com, matthew.gerlach@intel.com, richard.gong@intel.com, Russ Weight Subject: [PATCH v8 3/3] fpga: region: Use standard dev_release for class driver Date: Thu, 24 Jun 2021 13:53:55 -0700 Message-Id: <20210624205355.517687-4-russell.h.weight@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210624205355.517687-1-russell.h.weight@intel.com> References: <20210624205355.517687-1-russell.h.weight@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fpga@vger.kernel.org The FPGA region class driver data structure is being treated as a managed resource instead of using the standard dev_release call-back function to release the class data structure. This change removes the managed resource code and combines the create() and register() functions into a single register() or register_simple() function. The register() function accepts an info data structure to provide flexibility in passing optional parameters. The register_simple() function supports the current parameter list for users that don't require the use of optional parameters. Signed-off-by: Russ Weight Reviewed-by: Xu Yilun --- v8: - Added reviewed-by tag. - Updated Documentation/driver-api/fpga/fpga-region.rst documentation. v7: - Update the commit message to describe the new parameters for the fpga_region_register() function and to mention the fpga_region_register_simple() function. - Fix function prototypes in header file to rename dev to parent. - Some cleanup of comments. - Update function defintions/prototypes to apply const to the new info parameter. - Verify a non-null info pointer in the register() functions. v6: - Moved FPGA manager optional parameters out of the ops structure and back into the FPGA Region structure. - Changed fpga_region_register() parameters to accept an info data structure to provide flexibility in passing optional parameters. - Added fpga_region_register_simple() functions to support current parameters for users that don't require the use of optional parameters. v5: - Rebased on top of recently accepted patches. - Created the fpga_region_ops data structure which is optionally passed to fpga_region_register(). compat_id, the get_bridges() pointer, and the priv pointer are included in the fpga_region_ops structure. v4: - Added the compat_id parameter to fpga_region_register() to ensure that the compat_id is set before the device_register() call. - Modified the dfl_fpga_feature_devs_enumerate() function to restore the fpga_region_register() call to the correct location. v3: - Cleaned up comment header for fpga_region_register() - Fix fpga_region_register() error return on ida_simple_get() failure v2: - No changes --- Documentation/driver-api/fpga/fpga-region.rst | 8 +- drivers/fpga/dfl-fme-region.c | 17 ++- drivers/fpga/dfl.c | 12 +- drivers/fpga/fpga-region.c | 121 +++++++----------- drivers/fpga/of-fpga-region.c | 11 +- include/linux/fpga/fpga-region.h | 36 ++++-- 6 files changed, 92 insertions(+), 113 deletions(-) diff --git a/Documentation/driver-api/fpga/fpga-region.rst b/Documentation/driver-api/fpga/fpga-region.rst index 2636a27c11b2..ee1cacf0fe1a 100644 --- a/Documentation/driver-api/fpga/fpga-region.rst +++ b/Documentation/driver-api/fpga/fpga-region.rst @@ -46,8 +46,8 @@ API to add a new FPGA region ---------------------------- * struct fpga_region - The FPGA region struct -* devm_fpga_region_create() - Allocate and init a region struct -* fpga_region_register() - Register an FPGA region +* fpga_region_register() - Create and register an FPGA region +* fpga_region_register_simple() - Create and register an FPGA region * fpga_region_unregister() - Unregister an FPGA region The FPGA region's probe function will need to get a reference to the FPGA @@ -76,10 +76,10 @@ following APIs to handle building or tearing down that list. :functions: fpga_region .. kernel-doc:: drivers/fpga/fpga-region.c - :functions: devm_fpga_region_create + :functions: fpga_region_register .. kernel-doc:: drivers/fpga/fpga-region.c - :functions: fpga_region_register + :functions: fpga_region_register_simple .. kernel-doc:: drivers/fpga/fpga-region.c :functions: fpga_region_unregister diff --git a/drivers/fpga/dfl-fme-region.c b/drivers/fpga/dfl-fme-region.c index 1eeb42af1012..36bf6865bbc3 100644 --- a/drivers/fpga/dfl-fme-region.c +++ b/drivers/fpga/dfl-fme-region.c @@ -30,6 +30,7 @@ static int fme_region_get_bridges(struct fpga_region *region) static int fme_region_probe(struct platform_device *pdev) { struct dfl_fme_region_pdata *pdata = dev_get_platdata(&pdev->dev); + struct fpga_region_info info = { 0 }; struct device *dev = &pdev->dev; struct fpga_region *region; struct fpga_manager *mgr; @@ -39,20 +40,18 @@ static int fme_region_probe(struct platform_device *pdev) if (IS_ERR(mgr)) return -EPROBE_DEFER; - region = devm_fpga_region_create(dev, mgr, fme_region_get_bridges); - if (!region) { - ret = -ENOMEM; + info.mgr = mgr; + info.compat_id = mgr->compat_id; + info.get_bridges = fme_region_get_bridges; + info.priv = pdata; + region = fpga_region_register(dev, &info); + if (IS_ERR(region)) { + ret = PTR_ERR(region); goto eprobe_mgr_put; } - region->priv = pdata; - region->compat_id = mgr->compat_id; platform_set_drvdata(pdev, region); - ret = fpga_region_register(region); - if (ret) - goto eprobe_mgr_put; - dev_dbg(dev, "DFL FME FPGA Region probed\n"); return 0; diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c index 511b20ff35a3..a4269d40586e 100644 --- a/drivers/fpga/dfl.c +++ b/drivers/fpga/dfl.c @@ -1400,19 +1400,15 @@ dfl_fpga_feature_devs_enumerate(struct dfl_fpga_enum_info *info) if (!cdev) return ERR_PTR(-ENOMEM); - cdev->region = devm_fpga_region_create(info->dev, NULL, NULL); - if (!cdev->region) { - ret = -ENOMEM; - goto free_cdev_exit; - } - cdev->parent = info->dev; mutex_init(&cdev->lock); INIT_LIST_HEAD(&cdev->port_dev_list); - ret = fpga_region_register(cdev->region); - if (ret) + cdev->region = fpga_region_register_simple(info->dev, NULL, NULL); + if (IS_ERR(cdev->region)) { + ret = PTR_ERR(cdev->region); goto free_cdev_exit; + } /* create and init build info for enumeration */ binfo = devm_kzalloc(info->dev, sizeof(*binfo), GFP_KERNEL); diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c index a4838715221f..7009f366e27a 100644 --- a/drivers/fpga/fpga-region.c +++ b/drivers/fpga/fpga-region.c @@ -180,39 +180,42 @@ static struct attribute *fpga_region_attrs[] = { ATTRIBUTE_GROUPS(fpga_region); /** - * fpga_region_create - alloc and init a struct fpga_region + * fpga_region_register - create and register an FPGA Region device * @parent: device parent - * @mgr: manager that programs this region - * @get_bridges: optional function to get bridges to a list - * - * The caller of this function is responsible for freeing the resulting region - * struct with fpga_region_free(). Using devm_fpga_region_create() instead is - * recommended. + * @info: parameters for FPGA Region * - * Return: struct fpga_region or NULL + * Return: struct fpga_region or ERR_PTR() */ -struct fpga_region -*fpga_region_create(struct device *parent, - struct fpga_manager *mgr, - int (*get_bridges)(struct fpga_region *)) +struct fpga_region * +fpga_region_register(struct device *parent, const struct fpga_region_info *info) { struct fpga_region *region; int id, ret = 0; + if (!info) { + dev_err(parent, + "Attempt to register without required info structure\n"); + return ERR_PTR(-EINVAL); + } + region = kzalloc(sizeof(*region), GFP_KERNEL); if (!region) - return NULL; + return ERR_PTR(-ENOMEM); id = ida_simple_get(&fpga_region_ida, 0, 0, GFP_KERNEL); - if (id < 0) + if (id < 0) { + ret = id; goto err_free; + } + + region->mgr = info->mgr; + region->compat_id = info->compat_id; + region->priv = info->priv; + region->get_bridges = info->get_bridges; - region->mgr = mgr; - region->get_bridges = get_bridges; mutex_init(®ion->mutex); INIT_LIST_HEAD(®ion->bridge_list); - device_initialize(®ion->dev); region->dev.class = fpga_region_class; region->dev.parent = parent; region->dev.of_node = parent->of_node; @@ -222,6 +225,12 @@ struct fpga_region if (ret) goto err_remove; + ret = device_register(®ion->dev); + if (ret) { + put_device(®ion->dev); + return ERR_PTR(ret); + } + return region; err_remove: @@ -229,78 +238,34 @@ struct fpga_region err_free: kfree(region); - return NULL; -} -EXPORT_SYMBOL_GPL(fpga_region_create); - -/** - * fpga_region_free - free an FPGA region created by fpga_region_create() - * @region: FPGA region - */ -void fpga_region_free(struct fpga_region *region) -{ - ida_simple_remove(&fpga_region_ida, region->dev.id); - kfree(region); -} -EXPORT_SYMBOL_GPL(fpga_region_free); - -static void devm_fpga_region_release(struct device *dev, void *res) -{ - struct fpga_region *region = *(struct fpga_region **)res; - - fpga_region_free(region); + return ERR_PTR(ret); } +EXPORT_SYMBOL_GPL(fpga_region_register); /** - * devm_fpga_region_create - create and initialize a managed FPGA region struct + * fpga_region_register_simple - create and register an FPGA Region device * @parent: device parent * @mgr: manager that programs this region * @get_bridges: optional function to get bridges to a list * - * This function is intended for use in an FPGA region driver's probe function. - * After the region driver creates the region struct with - * devm_fpga_region_create(), it should register it with fpga_region_register(). - * The region driver's remove function should call fpga_region_unregister(). - * The region struct allocated with this function will be freed automatically on - * driver detach. This includes the case of a probe function returning error - * before calling fpga_region_register(), the struct will still get cleaned up. + * This simple version of the register should be sufficient for most users. + * The fpga_region_register() function is available for users that need to + * pass additional, optional parameters. * - * Return: struct fpga_region or NULL + * Return: struct fpga_region or ERR_PTR() */ -struct fpga_region -*devm_fpga_region_create(struct device *parent, - struct fpga_manager *mgr, - int (*get_bridges)(struct fpga_region *)) +struct fpga_region * +fpga_region_register_simple(struct device *parent, struct fpga_manager *mgr, + int (*get_bridges)(struct fpga_region *)) { - struct fpga_region **ptr, *region; - - ptr = devres_alloc(devm_fpga_region_release, sizeof(*ptr), GFP_KERNEL); - if (!ptr) - return NULL; - - region = fpga_region_create(parent, mgr, get_bridges); - if (!region) { - devres_free(ptr); - } else { - *ptr = region; - devres_add(parent, ptr); - } + struct fpga_region_info info = { 0 }; - return region; -} -EXPORT_SYMBOL_GPL(devm_fpga_region_create); + info.mgr = mgr; + info.get_bridges = get_bridges; -/** - * fpga_region_register - register an FPGA region - * @region: FPGA region - * - * Return: 0 or -errno - */ -int fpga_region_register(struct fpga_region *region) -{ - return device_add(®ion->dev); + return fpga_region_register(parent, &info); } -EXPORT_SYMBOL_GPL(fpga_region_register); +EXPORT_SYMBOL_GPL(fpga_region_register_simple); /** * fpga_region_unregister - unregister an FPGA region @@ -316,6 +281,10 @@ EXPORT_SYMBOL_GPL(fpga_region_unregister); static void fpga_region_dev_release(struct device *dev) { + struct fpga_region *region = to_fpga_region(dev); + + ida_simple_remove(&fpga_region_ida, region->dev.id); + kfree(region); } /** diff --git a/drivers/fpga/of-fpga-region.c b/drivers/fpga/of-fpga-region.c index e3c25576b6b9..377d19585d8e 100644 --- a/drivers/fpga/of-fpga-region.c +++ b/drivers/fpga/of-fpga-region.c @@ -405,16 +405,13 @@ static int of_fpga_region_probe(struct platform_device *pdev) if (IS_ERR(mgr)) return -EPROBE_DEFER; - region = devm_fpga_region_create(dev, mgr, of_fpga_region_get_bridges); - if (!region) { - ret = -ENOMEM; + region = fpga_region_register_simple(dev, mgr, + of_fpga_region_get_bridges); + if (IS_ERR(region)) { + ret = PTR_ERR(region); goto eprobe_mgr_put; } - ret = fpga_region_register(region); - if (ret) - goto eprobe_mgr_put; - of_platform_populate(np, fpga_region_of_match, NULL, ®ion->dev); platform_set_drvdata(pdev, region); diff --git a/include/linux/fpga/fpga-region.h b/include/linux/fpga/fpga-region.h index 27cb706275db..6c0da49265cb 100644 --- a/include/linux/fpga/fpga-region.h +++ b/include/linux/fpga/fpga-region.h @@ -7,6 +7,27 @@ #include #include +struct fpga_region; + +/** + * struct fpga_region_info - collection of parameters an FPGA Region + * @mgr: fpga region manager + * @compat_id: FPGA region id for compatibility check. + * @priv: fpga region private data + * @get_bridges: optional function to get bridges to a list + * + * fpga_region_info contains parameters for the register function. These + * are separated into an info structure because they some are optional + * others could be added to in the future. The info structure facilitates + * maintaining a stable API. + */ +struct fpga_region_info { + struct fpga_manager *mgr; + struct fpga_compat_id *compat_id; + void *priv; + int (*get_bridges)(struct fpga_region *region); +}; + /** * struct fpga_region - FPGA Region structure * @dev: FPGA Region device @@ -37,15 +58,12 @@ struct fpga_region *fpga_region_class_find( int fpga_region_program_fpga(struct fpga_region *region); -struct fpga_region -*fpga_region_create(struct device *dev, struct fpga_manager *mgr, - int (*get_bridges)(struct fpga_region *)); -void fpga_region_free(struct fpga_region *region); -int fpga_region_register(struct fpga_region *region); -void fpga_region_unregister(struct fpga_region *region); +struct fpga_region * +fpga_region_register(struct device *parent, const struct fpga_region_info *info); -struct fpga_region -*devm_fpga_region_create(struct device *dev, struct fpga_manager *mgr, - int (*get_bridges)(struct fpga_region *)); +struct fpga_region * +fpga_region_register_simple(struct device *parent, struct fpga_manager *mgr, + int (*get_bridges)(struct fpga_region *)); +void fpga_region_unregister(struct fpga_region *region); #endif /* _FPGA_REGION_H */