From patchwork Wed May 22 10:34:58 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Suzuki K Poulose X-Patchwork-Id: 164788 Delivered-To: patch@linaro.org Received: by 2002:a92:9e1a:0:0:0:0:0 with SMTP id q26csp694101ili; Wed, 22 May 2019 03:35:59 -0700 (PDT) X-Google-Smtp-Source: APXvYqyspL9IsjRkfyUHAntY1+Jv9JD8OdDpArfx6hyut02cauuOyzWdA+blNaI43F+B4v+VFStp X-Received: by 2002:a63:ce54:: with SMTP id r20mr90853462pgi.37.1558521358969; Wed, 22 May 2019 03:35:58 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1558521358; cv=none; d=google.com; s=arc-20160816; b=ZXo5Uk43YuAtjhlTrV6RHk1+YyHV6mTZwWjkCorTqHGJG9jjiZh5++kO8z7BSqNGdh cO/PWw4o7CQQODLDFLs8v2uZCsMZWHR8bH3r2j219r2SbuDqGGxOgJQK7Ms79wsNcd/w u6EHfHAAxHFPGdKL20tB6mO6Sjv3h2AOCTCqwaTLFfBqAZt4/MMwbXuXUI78aqxA6x/+ jaoMiZUNmwz3aS7qV2odWEcsmicgPYwzt/K0dJTtZyC+M7QeXLs/9toazBdX4gI0LYCJ zy5Qc4KLkT4Fa8vs7e3W0Mda3IfiWpuBsyIMUWlQCSONVvdpM5+t42kPcYBB2ZPdvHoy GdLg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:references:in-reply-to:message-id:date :subject:cc:to:from; bh=kuCWlRPXkrSpxvivpVplbX9ZvF4FjA5kmX3jMLy15vs=; b=AdnAdv7+CkzKEtDo+bHFoWplSCpulpIO2BOcxiiZHXlhYDazq5+oE+EzWoKRt85+Rz LoRPL/Zx+aLZVJ6oqZC6Vpxt06VzIumypt+OB56YOeXKV2nrXZGtYLaC4Scs1bUfXYv1 XavZEbCV4Fkg/Tog33EgFABcn+sdY70J6MR+hvE9M0lM2pTIGuxyDmR1AnejB9jOtCWx lbysnCi8z1/kiy1OmejxmhbhL5prB3i1CXsAc3hMx94o9XNO5auRG9MhrVDO9ePQy5s1 IXSCrJIUw4UYdHaln5GbNPIm1FWfSYPAVgx5i3sl2HOMZPIE1rThj7pKQT+MjyZUthpo HRog== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id h68si25312309pgc.270.2019.05.22.03.35.58; Wed, 22 May 2019 03:35:58 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729479AbfEVKf4 (ORCPT + 30 others); Wed, 22 May 2019 06:35:56 -0400 Received: from foss.arm.com ([217.140.101.70]:47174 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729451AbfEVKfv (ORCPT ); Wed, 22 May 2019 06:35:51 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id D68001713; Wed, 22 May 2019 03:35:50 -0700 (PDT) Received: from en101.cambridge.arm.com (en101.cambridge.arm.com [10.1.196.93]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id C6E6D3F575; Wed, 22 May 2019 03:35:49 -0700 (PDT) From: Suzuki K Poulose To: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, mathieu.poirier@linaro.org, coresight@lists.linaro.org, Suzuki K Poulose Subject: [PATCH v4 25/30] coresight: Use fwnode handle instead of device names Date: Wed, 22 May 2019 11:34:58 +0100 Message-Id: <1558521304-27469-26-git-send-email-suzuki.poulose@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1558521304-27469-1-git-send-email-suzuki.poulose@arm.com> References: <1558521304-27469-1-git-send-email-suzuki.poulose@arm.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We rely on the device names to find a CoreSight device on the coresight bus. The device name however is obtained from the platform, which is bound to the real platform/amba device. As we are about to use different naming scheme for the coresight devices, we can't rely on the platform device name to find the corresponding coresight device. Instead we use the platform agnostic "fwnode handle" of the parent device to find the devices. We also reuse the same fwnode as the parent for the Coresight device we create. Reviewed-by: Mathieu Poirier Signed-off-by: Suzuki K Poulose --- drivers/hwtracing/coresight/coresight-platform.c | 14 +++++--- drivers/hwtracing/coresight/coresight-priv.h | 6 ++-- drivers/hwtracing/coresight/coresight.c | 42 +++++++++++++++++++----- include/linux/coresight.h | 4 +-- 4 files changed, 49 insertions(+), 17 deletions(-) -- 2.7.4 diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c index 4394095..49112a5 100644 --- a/drivers/hwtracing/coresight/coresight-platform.c +++ b/drivers/hwtracing/coresight/coresight-platform.c @@ -36,7 +36,7 @@ static int coresight_alloc_conns(struct device *dev, return 0; } -static int coresight_device_fwnode_match(struct device *dev, void *fwnode) +int coresight_device_fwnode_match(struct device *dev, void *fwnode) { return dev_fwnode(dev) == fwnode; } @@ -219,9 +219,15 @@ static int of_coresight_parse_endpoint(struct device *dev, } conn->outport = endpoint.port; - conn->child_name = devm_kstrdup(dev, - dev_name(rdev), - GFP_KERNEL); + /* + * Hold the refcount to the target device. This could be + * released via: + * 1) coresight_release_platform_data() if the probe fails or + * this device is unregistered. + * 2) While removing the target device via + * coresight_remove_match() + */ + conn->child_fwnode = fwnode_handle_get(rdev_fwnode); conn->child_port = rendpoint.port; /* Connection record updated */ ret = 1; diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h index c216421..8b07fe5 100644 --- a/drivers/hwtracing/coresight/coresight-priv.h +++ b/drivers/hwtracing/coresight/coresight-priv.h @@ -200,8 +200,8 @@ static inline void *coresight_get_uci_data(const struct amba_id *id) return 0; } -static inline void -coresight_release_platform_data(struct coresight_platform_data *pdata) -{} +void coresight_release_platform_data(struct coresight_platform_data *pdata); + +int coresight_device_fwnode_match(struct device *dev, void *fwnode); #endif diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c index 526141c..1287778 100644 --- a/drivers/hwtracing/coresight/coresight.c +++ b/drivers/hwtracing/coresight/coresight.c @@ -978,6 +978,7 @@ static void coresight_device_release(struct device *dev) { struct coresight_device *csdev = to_coresight_device(dev); + fwnode_handle_put(csdev->dev.fwnode); kfree(csdev->refcnt); kfree(csdev); } @@ -1009,13 +1010,11 @@ static int coresight_orphan_match(struct device *dev, void *data) /* We have found at least one orphan connection */ if (conn->child_dev == NULL) { /* Does it match this newly added device? */ - if (conn->child_name && - !strcmp(dev_name(&csdev->dev), conn->child_name)) { + if (conn->child_fwnode == csdev->dev.fwnode) conn->child_dev = csdev; - } else { + else /* This component still has an orphan */ still_orphan = true; - } } } @@ -1047,9 +1046,9 @@ static void coresight_fixup_device_conns(struct coresight_device *csdev) struct coresight_connection *conn = &csdev->pdata->conns[i]; struct device *dev = NULL; - if (conn->child_name) - dev = bus_find_device_by_name(&coresight_bustype, NULL, - conn->child_name); + dev = bus_find_device(&coresight_bustype, NULL, + (void *)conn->child_fwnode, + coresight_device_fwnode_match); if (dev) { conn->child_dev = to_coresight_device(dev); /* and put reference from 'bus_find_device()' */ @@ -1084,9 +1083,15 @@ static int coresight_remove_match(struct device *dev, void *data) if (conn->child_dev == NULL) continue; - if (!strcmp(dev_name(&csdev->dev), conn->child_name)) { + if (csdev->dev.fwnode == conn->child_fwnode) { iterator->orphan = true; conn->child_dev = NULL; + /* + * Drop the reference to the handle for the remote + * device acquired in parsing the connections from + * platform data. + */ + fwnode_handle_put(conn->child_fwnode); /* No need to continue */ break; } @@ -1166,6 +1171,22 @@ static int __init coresight_init(void) } postcore_initcall(coresight_init); +/* + * coresight_release_platform_data: Release references to the devices connected + * to the output port of this device. + */ +void coresight_release_platform_data(struct coresight_platform_data *pdata) +{ + int i; + + for (i = 0; i < pdata->nr_outport; i++) { + if (pdata->conns[i].child_fwnode) { + fwnode_handle_put(pdata->conns[i].child_fwnode); + pdata->conns[i].child_fwnode = NULL; + } + } +} + struct coresight_device *coresight_register(struct coresight_desc *desc) { int ret; @@ -1210,6 +1231,11 @@ struct coresight_device *coresight_register(struct coresight_desc *desc) csdev->dev.parent = desc->dev; csdev->dev.release = coresight_device_release; csdev->dev.bus = &coresight_bustype; + /* + * Hold the reference to our parent device. This will be + * dropped only in coresight_device_release(). + */ + csdev->dev.fwnode = fwnode_handle_get(dev_fwnode(desc->dev)); dev_set_name(&csdev->dev, "%s", desc->name); ret = device_register(&csdev->dev); diff --git a/include/linux/coresight.h b/include/linux/coresight.h index b67d507..b40544b 100644 --- a/include/linux/coresight.h +++ b/include/linux/coresight.h @@ -126,15 +126,15 @@ struct coresight_desc { /** * struct coresight_connection - representation of a single connection * @outport: a connection's output port number. - * @chid_name: remote component's name. * @child_port: remote component's port number @output is connected to. + * @chid_fwnode: remote component's fwnode handle. * @child_dev: a @coresight_device representation of the component connected to @outport. */ struct coresight_connection { int outport; - const char *child_name; int child_port; + struct fwnode_handle *child_fwnode; struct coresight_device *child_dev; };