From patchwork Tue Jan 29 17:59:06 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jaroslav Kysela X-Patchwork-Id: 10786853 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7C4C213B5 for ; Tue, 29 Jan 2019 18:38:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F2B482C85E for ; Tue, 29 Jan 2019 18:38:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E71C42C9D9; Tue, 29 Jan 2019 18:38:57 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 50C732C9BD for ; Tue, 29 Jan 2019 18:38:53 +0000 (UTC) Received: from alsa0.perex.cz (localhost [127.0.0.1]) by alsa0.perex.cz (Postfix) with ESMTP id C710226757C; Tue, 29 Jan 2019 18:59:40 +0100 (CET) X-Original-To: alsa-devel@alsa-project.org Delivered-To: alsa-devel@alsa-project.org Received: by alsa0.perex.cz (Postfix, from userid 1000) id A162E26757F; Tue, 29 Jan 2019 18:59:38 +0100 (CET) Received: from mail1.perex.cz (mail1.perex.cz [77.48.224.245]) by alsa0.perex.cz (Postfix) with ESMTP id 36FB72674A3 for ; Tue, 29 Jan 2019 18:59:36 +0100 (CET) Received: from mail1.perex.cz (localhost [127.0.0.1]) by smtp1.perex.cz (Perex's E-mail Delivery System) with ESMTP id 11CB3A0040; Tue, 29 Jan 2019 18:59:36 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp1.perex.cz 11CB3A0040 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=perex.cz; s=default; t=1548784776; bh=DoW4ssrGndIagsa2j0QnvOHBk1aM7r4D40zD8pGm3is=; h=From:To:Cc:Subject:Date:From; b=WCWQtxKldLPIlIiwCeDBcWxYhWH0AbCGgvtxmCErH0XFitAWSawnquIE1awp2W4PV nzQZwrEjMuwYlGxcvPwRiVVr/bfWhy4mc3+r9HIlL1bNmM8cXUN3vw5jV5N5g9OaIz uyWo+mj8dSMYY2gsHeGqA7Y/WO82kL5lMaheBYak= Received: from p50.perex-int.cz (unknown [192.168.100.94]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: perex) by mail1.perex.cz (Perex's E-mail Delivery System) with ESMTPSA; Tue, 29 Jan 2019 18:59:29 +0100 (CET) From: Jaroslav Kysela To: ALSA development Date: Tue, 29 Jan 2019 18:59:06 +0100 Message-Id: <20190129175909.17423-1-perex@perex.cz> X-Mailer: git-send-email 2.13.6 Cc: Takashi Iwai , Mark Brown , Baolin Wang , Leo Yan Subject: [alsa-devel] [PATCH 0/3] ALSA: pcm: implement the anonymous dup X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org X-Virus-Scanned: ClamAV using ClamSMTP This patchset contains the anonymous dup implementation with permissions checking for the ALSA's PCM interface in kernel to enable the restricted DMA sound buffer sharing for the restricted tasks. The code was tested through qemu and it seems to be pretty stable. The initial tinyalsa implementation can be found here: https://github.com/perexg/tinyalsa/commits/anondup The filtering might be refined. It depends on the real requirements. Perhaps, we may create more ioctl groups. Any comments are more than welcome. Cc: Mark Brown Cc: Leo Yan Cc: Baolin Wang Jaroslav Kysela (3): ALSA: pcm: implement the anonymous dup (inode file descriptor) ALSA: pcm: remove the file member from struct pcm ALSA: pcm: implement the ioctl/mmap filter for the anonymous dup include/sound/pcm.h | 10 +-- include/uapi/sound/asound.h | 12 +++- sound/core/oss/pcm_oss.c | 3 +- sound/core/pcm.c | 48 +++++++++----- sound/core/pcm_compat.c | 1 + sound/core/pcm_native.c | 154 +++++++++++++++++++++++++++++++++++++++++--- 6 files changed, 195 insertions(+), 33 deletions(-)