From patchwork Mon Aug 26 08:30:57 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Ming4" X-Patchwork-Id: 13777449 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.9]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 09B8513AD3F for ; Mon, 26 Aug 2024 09:01:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.9 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724662882; cv=none; b=m/UjxoXBEdwveSalRo0f+kUDW+fcZtn/pt6MG22bvQNSw9lTIa6iRLXxMFULv9W4ZKoGzWpOBweOe3iGtLl+pQ2txUos5WdcXq1n5KUO22hYFjGiYpBg0T08KlEILJFf7qFbTIjtBl2yoj0/RM3WUyjV5s268NvDAQIlm5Png1w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724662882; c=relaxed/simple; bh=KSF6fghZFI0nvIWmC9N8+8VVHqN3oLJKucuVkjYAaV0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=q/cvnYdBkk15F8vgfLdWrG5zdXk1NnFy6PRhvxv5M/1//VTarBeEnOi8/uRYVVrVkm4aelJPVfWUfb8gpoPB0r+pu2tcULQxJdNppNbJ1J+LpQbrynQxggfb9XMTHnynEV2f339F5sDR5xjnsBXBoTIPzoNbVb/xvRQU5wCbqns= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=gdA9Ltcq; arc=none smtp.client-ip=192.198.163.9 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="gdA9Ltcq" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1724662881; x=1756198881; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=KSF6fghZFI0nvIWmC9N8+8VVHqN3oLJKucuVkjYAaV0=; b=gdA9Ltcq4Y8L8AgWdNoTq4zjvvu+Oc3t3lNRxrp5Y3q9leNNpCEBV29t AYt2MMSHVVCBCABcV9MaoU8g6DubJKFcy8iDSdXvHBGSdjFbG73icr1z2 B2gLd68ku0M66TnKHrRD5oH4YMGSR7e2RNmB0g2SJbD7wp6mZoVoL3efr //L8u50wgS80aRDkmkNflQKZPBSQ4mbCIyyfnmSKAa79jsCSIEQCXPsVY p69BHBQbHYfQTSQ/9bz430uVmxpCSJaz0KNpm4XBEvtNyKvTjqxF+hDJT ABvP144hQREpYKlNZGC8XNu0QFJrNGCVoXryrjc6po3TF5IVonQfJSgaI A==; X-CSE-ConnectionGUID: 16DixPNWSGqoWLsQznRvcQ== X-CSE-MsgGUID: VIlM0tivSryr3d0XCa3WxQ== X-IronPort-AV: E=McAfee;i="6700,10204,11175"; a="33737713" X-IronPort-AV: E=Sophos;i="6.10,177,1719903600"; d="scan'208";a="33737713" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by fmvoesa103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Aug 2024 02:01:20 -0700 X-CSE-ConnectionGUID: 2eSBGo6PTAGFGiwEG1KPCQ== X-CSE-MsgGUID: 8zmyfklPQx26weWpzeNRYw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,177,1719903600"; d="scan'208";a="66617145" Received: from s2600wttr.bj.intel.com ([10.240.192.138]) by fmviesa003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Aug 2024 02:01:18 -0700 From: Li Ming To: dave@stgolabs.net, jonathan.cameron@huawei.com, dave.jiang@intel.com, alison.schofield@intel.com, vishal.l.verma@intel.com, ira.weiny@intel.com, dan.j.williams@intel.com Cc: linux-cxl@vger.kernel.org, Li Ming Subject: [PATCH v2 2/3] cxl/port: Use scoped_guard()/guard() to drop device_lock() for cxl_port Date: Mon, 26 Aug 2024 08:30:57 +0000 Message-Id: <20240826083058.1509232-2-ming4.li@intel.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20240826083058.1509232-1-ming4.li@intel.com> References: <20240826083058.1509232-1-ming4.li@intel.com> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 A device_lock() and device_unlock() pair can be replaced by a cleanup helper scoped_guard() or guard(), that can enhance code readability. In CXL subsystem, still use device_lock() and device_unlock() pairs for cxl port resource protection, most of them can be replaced by a scoped_guard() or a guard() simply. Suggested-by: Dan Williams Signed-off-by: Li Ming Reviewed-by: Jonathan Cameron --- drivers/cxl/core/mbox.c | 3 +- drivers/cxl/core/port.c | 93 +++++++++++++++++---------------------- drivers/cxl/core/region.c | 25 ++++++----- drivers/cxl/mem.c | 22 +++++---- drivers/cxl/pmem.c | 16 +++---- 5 files changed, 72 insertions(+), 87 deletions(-) diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c index e5cdeafdf76e..0a913b30c7fc 100644 --- a/drivers/cxl/core/mbox.c +++ b/drivers/cxl/core/mbox.c @@ -1214,7 +1214,7 @@ int cxl_mem_sanitize(struct cxl_memdev *cxlmd, u16 cmd) int rc; /* synchronize with cxl_mem_probe() and decoder write operations */ - device_lock(&cxlmd->dev); + guard(device)(&cxlmd->dev); endpoint = cxlmd->endpoint; down_read(&cxl_region_rwsem); /* @@ -1226,7 +1226,6 @@ int cxl_mem_sanitize(struct cxl_memdev *cxlmd, u16 cmd) else rc = -EBUSY; up_read(&cxl_region_rwsem); - device_unlock(&cxlmd->dev); return rc; } diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index b50dda6610e3..7b87b5142fa7 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -1258,18 +1258,13 @@ EXPORT_SYMBOL_NS_GPL(devm_cxl_add_rch_dport, CXL); static int add_ep(struct cxl_ep *new) { struct cxl_port *port = new->dport->port; - int rc; - device_lock(&port->dev); - if (port->dead) { - device_unlock(&port->dev); + guard(device)(&port->dev); + if (port->dead) return -ENXIO; - } - rc = xa_insert(&port->endpoints, (unsigned long)new->ep, new, - GFP_KERNEL); - device_unlock(&port->dev); - return rc; + return xa_insert(&port->endpoints, (unsigned long)new->ep, + new, GFP_KERNEL); } /** @@ -1393,14 +1388,14 @@ static void delete_endpoint(void *data) struct cxl_port *endpoint = cxlmd->endpoint; struct device *host = endpoint_host(endpoint); - device_lock(host); - if (host->driver && !endpoint->dead) { - devm_release_action(host, cxl_unlink_parent_dport, endpoint); - devm_release_action(host, cxl_unlink_uport, endpoint); - devm_release_action(host, unregister_port, endpoint); + scoped_guard(device, host) { + if (host->driver && !endpoint->dead) { + devm_release_action(host, cxl_unlink_parent_dport, endpoint); + devm_release_action(host, cxl_unlink_uport, endpoint); + devm_release_action(host, unregister_port, endpoint); + } + cxlmd->endpoint = NULL; } - cxlmd->endpoint = NULL; - device_unlock(host); put_device(&endpoint->dev); put_device(host); } @@ -1561,40 +1556,38 @@ static int add_port_attach_ep(struct cxl_memdev *cxlmd, return -EAGAIN; } - device_lock(&parent_port->dev); - if (!parent_port->dev.driver) { - dev_warn(&cxlmd->dev, - "port %s:%s disabled, failed to enumerate CXL.mem\n", - dev_name(&parent_port->dev), dev_name(uport_dev)); - port = ERR_PTR(-ENXIO); - goto out; - } + scoped_guard(device, &parent_port->dev) { + if (!parent_port->dev.driver) { + dev_warn(&cxlmd->dev, + "port %s:%s disabled, failed to enumerate CXL.mem\n", + dev_name(&parent_port->dev), dev_name(uport_dev)); + return -ENXIO; + } + + port = find_cxl_port_at(parent_port, dport_dev, &dport); + if (!port) { + component_reg_phys = find_component_registers(uport_dev); + port = devm_cxl_add_port(&parent_port->dev, uport_dev, + component_reg_phys, parent_dport); + if (IS_ERR(port)) + return PTR_ERR(port); - port = find_cxl_port_at(parent_port, dport_dev, &dport); - if (!port) { - component_reg_phys = find_component_registers(uport_dev); - port = devm_cxl_add_port(&parent_port->dev, uport_dev, - component_reg_phys, parent_dport); - /* retry find to pick up the new dport information */ - if (!IS_ERR(port)) + /* retry find to pick up the new dport information */ port = find_cxl_port_at(parent_port, dport_dev, &dport); + if (!port) + return -ENXIO; + } } -out: - device_unlock(&parent_port->dev); - if (IS_ERR(port)) - rc = PTR_ERR(port); - else { - dev_dbg(&cxlmd->dev, "add to new port %s:%s\n", - dev_name(&port->dev), dev_name(port->uport_dev)); - rc = cxl_add_ep(dport, &cxlmd->dev); - if (rc == -EBUSY) { - /* - * "can't" happen, but this error code means - * something to the caller, so translate it. - */ - rc = -ENXIO; - } + dev_dbg(&cxlmd->dev, "add to new port %s:%s\n", + dev_name(&port->dev), dev_name(port->uport_dev)); + rc = cxl_add_ep(dport, &cxlmd->dev); + if (rc == -EBUSY) { + /* + * "can't" happen, but this error code means + * something to the caller, so translate it. + */ + rc = -ENXIO; } return rc; @@ -1975,7 +1968,6 @@ EXPORT_SYMBOL_NS_GPL(cxl_decoder_add_locked, CXL); int cxl_decoder_add(struct cxl_decoder *cxld, int *target_map) { struct cxl_port *port; - int rc; if (WARN_ON_ONCE(!cxld)) return -EINVAL; @@ -1985,11 +1977,8 @@ int cxl_decoder_add(struct cxl_decoder *cxld, int *target_map) port = to_cxl_port(cxld->dev.parent); - device_lock(&port->dev); - rc = cxl_decoder_add_locked(cxld, target_map); - device_unlock(&port->dev); - - return rc; + guard(device)(&port->dev); + return cxl_decoder_add_locked(cxld, target_map); } EXPORT_SYMBOL_NS_GPL(cxl_decoder_add, CXL); diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index 21ad5f242875..9a7c001eff1e 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -3094,11 +3094,11 @@ static void cxlr_release_nvdimm(void *_cxlr) struct cxl_region *cxlr = _cxlr; struct cxl_nvdimm_bridge *cxl_nvb = cxlr->cxl_nvb; - device_lock(&cxl_nvb->dev); - if (cxlr->cxlr_pmem) - devm_release_action(&cxl_nvb->dev, cxlr_pmem_unregister, - cxlr->cxlr_pmem); - device_unlock(&cxl_nvb->dev); + scoped_guard(device, &cxl_nvb->dev) { + if (cxlr->cxlr_pmem) + devm_release_action(&cxl_nvb->dev, cxlr_pmem_unregister, + cxlr->cxlr_pmem); + } cxlr->cxl_nvb = NULL; put_device(&cxl_nvb->dev); } @@ -3134,13 +3134,14 @@ static int devm_cxl_add_pmem_region(struct cxl_region *cxlr) dev_dbg(&cxlr->dev, "%s: register %s\n", dev_name(dev->parent), dev_name(dev)); - device_lock(&cxl_nvb->dev); - if (cxl_nvb->dev.driver) - rc = devm_add_action_or_reset(&cxl_nvb->dev, - cxlr_pmem_unregister, cxlr_pmem); - else - rc = -ENXIO; - device_unlock(&cxl_nvb->dev); + scoped_guard(device, &cxl_nvb->dev) { + if (cxl_nvb->dev.driver) + rc = devm_add_action_or_reset(&cxl_nvb->dev, + cxlr_pmem_unregister, + cxlr_pmem); + else + rc = -ENXIO; + } if (rc) goto err_bridge; diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c index ab9b8ab8df44..ae94018a01bd 100644 --- a/drivers/cxl/mem.c +++ b/drivers/cxl/mem.c @@ -168,19 +168,17 @@ static int cxl_mem_probe(struct device *dev) cxl_setup_parent_dport(dev, dport); - device_lock(endpoint_parent); - if (!endpoint_parent->driver) { - dev_err(dev, "CXL port topology %s not enabled\n", - dev_name(endpoint_parent)); - rc = -ENXIO; - goto unlock; - } + scoped_guard(device, endpoint_parent) { + if (!endpoint_parent->driver) { + dev_err(dev, "CXL port topology %s not enabled\n", + dev_name(endpoint_parent)); + return -ENXIO; + } - rc = devm_cxl_add_endpoint(endpoint_parent, cxlmd, dport); -unlock: - device_unlock(endpoint_parent); - if (rc) - return rc; + rc = devm_cxl_add_endpoint(endpoint_parent, cxlmd, dport); + if (rc) + return rc; + } /* * The kernel may be operating out of CXL memory on this device, diff --git a/drivers/cxl/pmem.c b/drivers/cxl/pmem.c index 4ef93da22335..647c7e25ef3a 100644 --- a/drivers/cxl/pmem.c +++ b/drivers/cxl/pmem.c @@ -233,15 +233,13 @@ static int detach_nvdimm(struct device *dev, void *data) if (!is_cxl_nvdimm(dev)) return 0; - device_lock(dev); - if (!dev->driver) - goto out; - - cxl_nvd = to_cxl_nvdimm(dev); - if (cxl_nvd->cxlmd && cxl_nvd->cxlmd->cxl_nvb == data) - release = true; -out: - device_unlock(dev); + scoped_guard(device, dev) { + if (dev->driver) { + cxl_nvd = to_cxl_nvdimm(dev); + if (cxl_nvd->cxlmd && cxl_nvd->cxlmd->cxl_nvb == data) + release = true; + } + } if (release) device_release_driver(dev); return 0;