From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756995AbcKBUco (ORCPT ); Wed, 2 Nov 2016 16:32:44 -0400 Received: from mail-co1nam03on0050.outbound.protection.outlook.com ([104.47.40.50]:19394 "EHLO NAM03-CO1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1756233AbcKBUcm (ORCPT ); Wed, 2 Nov 2016 16:32:42 -0400 Authentication-Results: spf=fail (sender IP is 192.88.158.2) smtp.mailfrom=nxp.com; transmode.se; dkim=none (message not signed) header.d=none;transmode.se; dmarc=fail action=none header.from=nxp.com; From: Madalin Bucur To: CC: , , , , , , , Subject: [PATCH net-next v6 01/10] devres: add devm_alloc_percpu() Date: Wed, 2 Nov 2016 22:17:25 +0200 Message-ID: <1478117854-8952-2-git-send-email-madalin.bucur@nxp.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1478117854-8952-1-git-send-email-madalin.bucur@nxp.com> References: <1478117854-8952-1-git-send-email-madalin.bucur@nxp.com> Reply-To: X-EOPAttributedMessage: 0 X-Matching-Connectors: 131225914634615378;(91ab9b29-cfa4-454e-5278-08d120cd25b8);() X-Forefront-Antispam-Report: CIP:192.88.158.2;IPV:NLI;CTRY:US;EFV:NLI;SFV:NSPM;SFS:(10009020)(6009001)(7916002)(2980300002)(1109001)(1110001)(339900001)(189002)(199003)(356003)(3450700001)(2906002)(81156014)(5003940100001)(81166006)(85426001)(11100500001)(104016004)(189998001)(77096005)(586003)(4326007)(87936001)(97736004)(76176999)(8676002)(6666003)(7846002)(50466002)(33646002)(305945005)(47776003)(36756003)(50986999)(48376002)(53806999)(68736007)(69596002)(5660300001)(19580405001)(19580395003)(626004)(8936002)(105606002)(2351001)(43066003)(86362001)(50226002)(229853001)(110136003)(106466001)(6916009)(2950100002);DIR:OUT;SFP:1101;SCL:1;SRVR:BY2PR0301MB1622;H:az84smr01.freescale.net;FPR:;SPF:Fail;PTR:InfoDomainNonexistent;MX:1;A:1;LANG:en; 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Add devm_alloc_percpu() and devm_free_percpu() into the managed interfaces list. Signed-off-by: Madalin Bucur --- Documentation/driver-model/devres.txt | 4 +++ drivers/base/devres.c | 66 +++++++++++++++++++++++++++++++++++ include/linux/device.h | 19 ++++++++++ 3 files changed, 89 insertions(+) diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt index 1670708..ca9d1eb 100644 --- a/Documentation/driver-model/devres.txt +++ b/Documentation/driver-model/devres.txt @@ -332,6 +332,10 @@ MEM MFD devm_mfd_add_devices() +PER-CPU MEM + devm_alloc_percpu() + devm_free_percpu() + PCI pcim_enable_device() : after success, all PCI ops become managed pcim_pin_device() : keep PCI device enabled after release diff --git a/drivers/base/devres.c b/drivers/base/devres.c index 8fc654f..71d5770 100644 --- a/drivers/base/devres.c +++ b/drivers/base/devres.c @@ -10,6 +10,7 @@ #include #include #include +#include #include "base.h" @@ -985,3 +986,68 @@ void devm_free_pages(struct device *dev, unsigned long addr) &devres)); } EXPORT_SYMBOL_GPL(devm_free_pages); + +static void devm_percpu_release(struct device *dev, void *pdata) +{ + void __percpu *p; + + p = *(void __percpu **)pdata; + free_percpu(p); +} + +static int devm_percpu_match(struct device *dev, void *data, void *p) +{ + struct devres *devr = container_of(data, struct devres, data); + + return *(void **)devr->data == p; +} + +/** + * __devm_alloc_percpu - Resource-managed alloc_percpu + * @dev: Device to allocate per-cpu memory for + * @size: Size of per-cpu memory to allocate + * @align: Alignment of per-cpu memory to allocate + * + * Managed alloc_percpu. Per-cpu memory allocated with this function is + * automatically freed on driver detach. + * + * RETURNS: + * Pointer to allocated memory on success, NULL on failure. + */ +void __percpu *__devm_alloc_percpu(struct device *dev, size_t size, + size_t align) +{ + void *p; + void __percpu *pcpu; + + pcpu = __alloc_percpu(size, align); + if (!pcpu) + return NULL; + + p = devres_alloc(devm_percpu_release, sizeof(void *), GFP_KERNEL); + if (!p) { + free_percpu(pcpu); + return NULL; + } + + *(void __percpu **)p = pcpu; + + devres_add(dev, p); + + return pcpu; +} +EXPORT_SYMBOL_GPL(__devm_alloc_percpu); + +/** + * devm_free_percpu - Resource-managed free_percpu + * @dev: Device this memory belongs to + * @pdata: Per-cpu memory to free + * + * Free memory allocated with devm_alloc_percpu(). + */ +void devm_free_percpu(struct device *dev, void __percpu *pdata) +{ + WARN_ON(devres_destroy(dev, devm_percpu_release, devm_percpu_match, + (void *)pdata)); +} +EXPORT_SYMBOL_GPL(devm_free_percpu); diff --git a/include/linux/device.h b/include/linux/device.h index bc41e87..043ffce 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -698,6 +698,25 @@ static inline int devm_add_action_or_reset(struct device *dev, return ret; } +/** + * devm_alloc_percpu - Resource-managed alloc_percpu + * @dev: Device to allocate per-cpu memory for + * @type: Type to allocate per-cpu memory for + * + * Managed alloc_percpu. Per-cpu memory allocated with this function is + * automatically freed on driver detach. + * + * RETURNS: + * Pointer to allocated memory on success, NULL on failure. + */ +#define devm_alloc_percpu(dev, type) \ + (typeof(type) __percpu *)__devm_alloc_percpu(dev, sizeof(type), \ + __alignof__(type)) + +void __percpu *__devm_alloc_percpu(struct device *dev, size_t size, + size_t align); +void devm_free_percpu(struct device *dev, void __percpu *pdata); + struct device_dma_parameters { /* * a low level driver may set these to teach IOMMU code about -- 2.1.0