From patchwork Fri Nov 1 11:48:14 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolin Chen X-Patchwork-Id: 3124491 X-Patchwork-Delegate: vinod.koul@intel.com Return-Path: X-Original-To: patchwork-dmaengine@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 025C7BEEB2 for ; Fri, 1 Nov 2013 11:51:05 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 1CB9820465 for ; Fri, 1 Nov 2013 11:51:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5F8B420435 for ; Fri, 1 Nov 2013 11:50:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755840Ab3KALsh (ORCPT ); Fri, 1 Nov 2013 07:48:37 -0400 Received: from va3ehsobe003.messaging.microsoft.com ([216.32.180.13]:27194 "EHLO va3outboundpool.messaging.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755557Ab3KALsf (ORCPT ); Fri, 1 Nov 2013 07:48:35 -0400 Received: from mail120-va3-R.bigfish.com (10.7.14.226) by VA3EHSOBE001.bigfish.com (10.7.40.21) with Microsoft SMTP Server id 14.1.225.22; Fri, 1 Nov 2013 11:48:33 +0000 Received: from mail120-va3 (localhost [127.0.0.1]) by mail120-va3-R.bigfish.com (Postfix) with ESMTP id 87FA43C0048; Fri, 1 Nov 2013 11:48:33 +0000 (UTC) X-Forefront-Antispam-Report: CIP:70.37.183.190; KIP:(null); UIP:(null); IPV:NLI; H:mail.freescale.net; RD:none; EFVD:NLI X-SpamScore: 6 X-BigFish: VS6(zzzz1f42h2148h208ch1ee6h1de0h1fdah2073h2146h1202h1e76h1d1ah1d2ah1fc6h1082kz70kz1de098h8275bh1de097hz2dh2a8h839hd24he5bhf0ah1288h12a5h12a9h12bdh12e5h137ah139eh13b6h1441h1504h1537h162dh1631h1758h1898h18e1h1946h19b5h1ad9h1b0ah1b2fh2222h1fb3h1d0ch1d2eh1d3fh1dfeh1dffh1e23h1fe8h1ff5h2218h2216h1155h) Received: from mail120-va3 (localhost.localdomain [127.0.0.1]) by mail120-va3 (MessageSwitch) id 1383306511695940_9195; Fri, 1 Nov 2013 11:48:31 +0000 (UTC) Received: from VA3EHSMHS029.bigfish.com (unknown [10.7.14.247]) by mail120-va3.bigfish.com (Postfix) with ESMTP id 990CC1A0052; Fri, 1 Nov 2013 11:48:31 +0000 (UTC) Received: from mail.freescale.net (70.37.183.190) by VA3EHSMHS029.bigfish.com (10.7.99.39) with Microsoft SMTP Server (TLS) id 14.16.227.3; Fri, 1 Nov 2013 11:48:31 +0000 Received: from az84smr01.freescale.net (10.64.34.197) by 039-SN1MMR1-001.039d.mgd.msft.net (10.84.1.13) with Microsoft SMTP Server (TLS) id 14.3.158.2; Fri, 1 Nov 2013 11:48:30 +0000 Received: from rio.ap.freescale.net (rio.ap.freescale.net [10.192.242.9]) by az84smr01.freescale.net (8.14.3/8.14.0) with ESMTP id rA1BmFGC005023; Fri, 1 Nov 2013 04:48:24 -0700 From: Nicolin Chen To: , , , , , , , , , , , , , , , , CC: , , , , , Subject: [PATCH][RESEND 1/8] lib/genalloc: add a helper function for DMA buffer allocation Date: Fri, 1 Nov 2013 19:48:14 +0800 Message-ID: <554196b707b88047dce4e300848b81cc2677578d.1383306365.git.b42378@freescale.com> X-Mailer: git-send-email 1.8.4 In-Reply-To: References: MIME-Version: 1.0 X-OriginatorOrg: freescale.com X-FOPE-CONNECTOR: Id%0$Dn%*$RO%0$TLS%0$FQDN%$TlsDn% Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org X-Spam-Status: No, score=-7.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP When using pool space for DMA buffer, there might be duplicated calling of gen_pool_alloc() and gen_pool_virt_to_phys() in each implementation. Thus it's better to add a simple helper function, a compatible one to the common dma_alloc_coherent(), to save some code. Signed-off-by: Nicolin Chen --- include/linux/genalloc.h | 2 ++ lib/genalloc.c | 28 ++++++++++++++++++++++++++++ 2 files changed, 30 insertions(+) diff --git a/include/linux/genalloc.h b/include/linux/genalloc.h index f8d41cb..1eda33d 100644 --- a/include/linux/genalloc.h +++ b/include/linux/genalloc.h @@ -94,6 +94,8 @@ static inline int gen_pool_add(struct gen_pool *pool, unsigned long addr, } extern void gen_pool_destroy(struct gen_pool *); extern unsigned long gen_pool_alloc(struct gen_pool *, size_t); +extern void *gen_pool_dma_alloc(struct gen_pool *pool, size_t size, + dma_addr_t *dma); extern void gen_pool_free(struct gen_pool *, unsigned long, size_t); extern void gen_pool_for_each_chunk(struct gen_pool *, void (*)(struct gen_pool *, struct gen_pool_chunk *, void *), void *); diff --git a/lib/genalloc.c b/lib/genalloc.c index 26cf20b..dda3116 100644 --- a/lib/genalloc.c +++ b/lib/genalloc.c @@ -313,6 +313,34 @@ retry: EXPORT_SYMBOL(gen_pool_alloc); /** + * gen_pool_dma_alloc - allocate special memory from the pool for DMA usage + * @pool: pool to allocate from + * @size: number of bytes to allocate from the pool + * @dma: dma-view physical address + * + * Allocate the requested number of bytes from the specified pool. + * Uses the pool allocation function (with first-fit algorithm by default). + * Can not be used in NMI handler on architectures without + * NMI-safe cmpxchg implementation. + */ +void *gen_pool_dma_alloc(struct gen_pool *pool, size_t size, dma_addr_t *dma) +{ + unsigned long vaddr; + + if (!pool) + return NULL; + + vaddr = gen_pool_alloc(pool, size); + if (!vaddr) + return NULL; + + *dma = gen_pool_virt_to_phys(pool, vaddr); + + return (void *)vaddr; +} +EXPORT_SYMBOL(gen_pool_dma_alloc); + +/** * gen_pool_free - free allocated special memory back to the pool * @pool: pool to free to * @addr: starting address of memory to free back to pool