From mboxrd@z Thu Jan 1 00:00:00 1970 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=-5.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_2 autolearn=unavailable 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 64662C2BB1D for ; Fri, 17 Apr 2020 23:04:11 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id AF551214D8 for ; Fri, 17 Apr 2020 23:04:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AF551214D8 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=buserror.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 493s944ZxjzDrfd for ; Sat, 18 Apr 2020 09:04:08 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=none (no SPF record) smtp.mailfrom=buserror.net (client-ip=165.227.176.147; helo=baldur.buserror.net; envelope-from=oss@buserror.net; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=buserror.net Received: from baldur.buserror.net (baldur.buserror.net [165.227.176.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 493s6z3chVzDr8v for ; Sat, 18 Apr 2020 09:02:19 +1000 (AEST) Received: from [2601:449:8480:af0:12bf:48ff:fe84:c9a0] by baldur.buserror.net with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1jPZzx-0007Uz-49; Fri, 17 Apr 2020 18:02:14 -0500 Message-ID: <1f05e37b5aa52aad44d4310edfdc6b36894cb964.camel@buserror.net> From: Scott Wood To: Wang Wenhu , gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Date: Fri, 17 Apr 2020 18:02:12 -0500 In-Reply-To: <20200417172130.14287-1-wenhu.wang@vivo.com> References: <20200417172130.14287-1-wenhu.wang@vivo.com> Organization: Red Hat Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.1 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-SA-Exim-Connect-IP: 2601:449:8480:af0:12bf:48ff:fe84:c9a0 X-SA-Exim-Rcpt-To: wenhu.wang@vivo.com, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, christophe.leroy@c-s.fr, kernel@vivo.com, robh@kernel.org, mpe@ellerman.id.au X-SA-Exim-Mail-From: oss@buserror.net Subject: Re: [PATCH] drivers: uio: new driver uio_fsl_85xx_cache_sram X-SA-Exim-Version: 4.2.1 (built Tue, 02 Aug 2016 21:08:31 +0000) X-SA-Exim-Scanned: Yes (on baldur.buserror.net) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kernel@vivo.com, robh@kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Fri, 2020-04-17 at 10:21 -0700, Wang Wenhu wrote: > Implements a new uio driver for freescale 85xx platforms to access > the Cache-Sram form user level. It is extremely helpful for the user > space applications that require high performance memory accesses. > > Cc: Greg Kroah-Hartman > Cc: Christophe Leroy > Cc: Scott Wood > Cc: Michael Ellerman > Cc: linuxppc-dev@lists.ozlabs.org > Signed-off-by: Wang Wenhu > --- > drivers/uio/Kconfig | 8 + > drivers/uio/Makefile | 1 + > drivers/uio/uio_fsl_85xx_cache_sram.c | 407 ++++++++++++++++++++++++++ > 3 files changed, 416 insertions(+) > create mode 100644 drivers/uio/uio_fsl_85xx_cache_sram.c NACK, we don't need two copies of this code in the kernel. Please just wait a bit and I'll send a patch to have the existing driver expose a dynamic allocation interface to userspace. -Scott