From patchwork Tue Jun 5 11:01:34 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shreyas NC X-Patchwork-Id: 10448045 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id E2EEC60467 for ; Tue, 5 Jun 2018 11:03:54 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CF15728E3B for ; Tue, 5 Jun 2018 11:03:54 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C21B028D8C; Tue, 5 Jun 2018 11:03:54 +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=-2.9 required=2.0 tests=BAYES_00, 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 0286B28D8C for ; Tue, 5 Jun 2018 11:03:54 +0000 (UTC) Received: from alsa0.perex.cz (localhost [127.0.0.1]) by alsa0.perex.cz (Postfix) with ESMTP id A187A267B21; Tue, 5 Jun 2018 13:03:31 +0200 (CEST) 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 4E70B267B1D; Tue, 5 Jun 2018 13:03:29 +0200 (CEST) Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by alsa0.perex.cz (Postfix) with ESMTP id 2142C267B18 for ; Tue, 5 Jun 2018 13:03:26 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 05 Jun 2018 04:03:26 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,478,1520924400"; d="scan'208";a="45385404" Received: from snc-desk.iind.intel.com ([10.223.96.118]) by fmsmga008.fm.intel.com with ESMTP; 05 Jun 2018 04:03:24 -0700 From: Shreyas NC To: alsa-devel@alsa-project.org Date: Tue, 5 Jun 2018 16:31:34 +0530 Message-Id: <1528196497-29554-4-git-send-email-shreyas.nc@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1528196497-29554-1-git-send-email-shreyas.nc@intel.com> References: <1528196497-29554-1-git-send-email-shreyas.nc@intel.com> Cc: patches.audio@intel.com, gregkh@linuxfoundation.org, pierre-louis.bossart@linux.intel.com, vkoul@kernel.org, Shreyas NC , sanyog.r.kale@intel.com Subject: [alsa-devel] [PATCH 3/6] soundwire: Add support to lock across bus instances 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 From: Sanyog Kale Currently, the stream concept is limited to a Master and one or more Codecs. This patch extends the concept to support multiple Master(s) sharing the same reference clock and synchronized in the hardware. Modify sdw_stream_runtime to support a list of sdw_master_runtime for the same. The existing reference to a single m_rt is removed in the next patch. Typically to lock, one would acquire a global lock and then lock bus instances. In this case, the caller framework(ASoC DPCM) guarentees that stream operations on a card are always serialised. So, there is no race condition and hence no need for global lock. Bus lock(s) are acquired to reconfigure the bus while the stream is set-up. So, we add sdw_acquire_bus_lock()/sdw_release_bus_lock() for the same. Signed-off-by: Sanyog Kale Signed-off-by: Vinod Koul Signed-off-by: Shreyas NC --- drivers/soundwire/bus.h | 2 ++ drivers/soundwire/stream.c | 26 ++++++++++++++++++++++++++ include/linux/soundwire/sdw.h | 2 ++ 3 files changed, 30 insertions(+) diff --git a/drivers/soundwire/bus.h b/drivers/soundwire/bus.h index 3b15c4e..b6cfbdf 100644 --- a/drivers/soundwire/bus.h +++ b/drivers/soundwire/bus.h @@ -99,6 +99,7 @@ struct sdw_slave_runtime { * this stream, can be zero. * @slave_rt_list: Slave runtime list * @port_list: List of Master Ports configured for this stream, can be zero. + * @stream_node: sdw_stream_runtime master_list node * @bus_node: sdw_bus m_rt_list node */ struct sdw_master_runtime { @@ -108,6 +109,7 @@ struct sdw_master_runtime { unsigned int ch_count; struct list_head slave_rt_list; struct list_head port_list; + struct list_head stream_node; struct list_head bus_node; }; diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c index 68252f2..604fe93 100644 --- a/drivers/soundwire/stream.c +++ b/drivers/soundwire/stream.c @@ -749,6 +749,7 @@ struct sdw_stream_runtime *sdw_alloc_stream(char *stream_name) return NULL; stream->name = stream_name; + INIT_LIST_HEAD(&stream->master_list); stream->state = SDW_STREAM_ALLOCATED; return stream; @@ -1243,6 +1244,31 @@ struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave, return NULL; } +static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream) +{ + struct sdw_master_runtime *m_rt = NULL; + struct sdw_bus *bus = NULL; + + /* Iterate for all Master(s) in Master list */ + list_for_each_entry(m_rt, &stream->master_list, stream_node) { + bus = m_rt->bus; + + mutex_lock(&bus->bus_lock); + } +} + +static void sdw_release_bus_lock(struct sdw_stream_runtime *stream) +{ + struct sdw_master_runtime *m_rt = NULL; + struct sdw_bus *bus = NULL; + + /* Iterate for all Master(s) in Master list */ + list_for_each_entry(m_rt, &stream->master_list, stream_node) { + bus = m_rt->bus; + mutex_unlock(&bus->bus_lock); + } +} + static int _sdw_prepare_stream(struct sdw_stream_runtime *stream) { struct sdw_master_runtime *m_rt = stream->m_rt; diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h index 322baf4..5692de0 100644 --- a/include/linux/soundwire/sdw.h +++ b/include/linux/soundwire/sdw.h @@ -769,6 +769,7 @@ struct sdw_stream_params { * @state: Current state of the stream * @type: Stream type PCM or PDM * @m_rt: Master runtime + * @master_list: List of Master runtime(s) in this stream */ struct sdw_stream_runtime { char *name; @@ -776,6 +777,7 @@ struct sdw_stream_runtime { enum sdw_stream_state state; enum sdw_stream_type type; struct sdw_master_runtime *m_rt; + struct list_head master_list; }; struct sdw_stream_runtime *sdw_alloc_stream(char *stream_name);