From patchwork Wed Mar 24 05:42:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Henningsson X-Patchwork-Id: 12160239 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 2EB0DC433C1 for ; Wed, 24 Mar 2021 05:44:12 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (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 00D9B619DB for ; Wed, 24 Mar 2021 05:44:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 00D9B619DB Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=diwic.se Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=alsa-devel-bounces@alsa-project.org Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 3B2661678; Wed, 24 Mar 2021 06:43:19 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 3B2661678 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1616564649; bh=osPk0pRoKU4FjbzG6POalOdEJkxGIV9Ck+aCk0AslXw=; h=From:To:Subject:Date:Cc:List-Id:List-Unsubscribe:List-Archive: List-Post:List-Help:List-Subscribe:From; b=IXAp9ref2VhhC61HKfapJ1/Cob6Wn/wAJPHm7+FoYg9fAYwdwFMrhtf9RT7aUlGIX nYnpEPZBlCVIkYNPxZRIDICgK2ou9IbouCPpqkljPo/jlhV5L0qupfqdfqgUauFxOz LAhVlJ9/X5rzG0RWr3ItdXD9KOMuOC/TO+MNbBzI= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 7BD46F80156; Wed, 24 Mar 2021 06:43:18 +0100 (CET) Received: by alsa1.perex.cz (Postfix, from userid 50401) id B0B7BF8016B; Wed, 24 Mar 2021 06:43:16 +0100 (CET) Received: from ns4.inleed.net (mailout4.inleed.net [IPv6:2a0b:dc80:cafe:104::1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 429F7F800FF for ; Wed, 24 Mar 2021 06:43:09 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 429F7F800FF Authentication-Results: alsa1.perex.cz; dkim=pass (2048-bit key) header.d=diwic.se header.i=@diwic.se header.b="OtXkMjVc" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=diwic.se; s=x; h=Content-Transfer-Encoding:MIME-Version:Message-Id:Date:Subject:Cc:To: From:Sender:Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To: References:List-Id:List-Help:List-Unsubscribe:List-Subscribe:List-Post: List-Owner:List-Archive; bh=eYchDQmBRLxoRE0+yP0UoLKIZgtg4/rV3Co4R+jm8xI=; b=O tXkMjVc8lrp9PJ7cBTAPal02j4yjcsN8vMhBNIgL1fT8g3Ffdetrfd95q5e5zK1Sd1kdPn+7XYu/R IPtx8GRfBoM3gboJ8gc3ZHlvfOvDB11oyzMmEZkWx7iLseUt6AhthsXLpMQIdjiRHodyxhkCDj+6+ +5UCPNXeGwAJQpwq1hiOQh9yp0dLFp0/gqjV8+Vx1g6wEUAqdp1wvCyNaqG7DvnyBQocMqtO8XAhS ixvntYHzWFB6G7ienLvxWYmLR0dNXnXgC90oIxa7+IYCcAfsury/sm52sLLV+zLge3xEAeBzEJWQF IrkBQLNDiFx+BYx3N0spnidYpVd8xhZgA==; Received: from c83-254-143-147.bredband.comhem.se ([83.254.143.147] helo=localhost.localdomain) by ns4.inleed.net with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.94) (envelope-from ) id 1lOwIJ-005cNI-Tk; Wed, 24 Mar 2021 06:43:03 +0100 From: David Henningsson To: alsa-devel@alsa-project.org, tiwai@suse.de, perex@perex.cz Subject: [PATCH v2] sound: rawmidi: Add framing mode Date: Wed, 24 Mar 2021 06:42:53 +0100 Message-Id: <20210324054253.34642-1-coding@diwic.se> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Authenticated-Id: coding@diwic.se Cc: David Henningsson X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 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: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" This commit adds a new framing mode that frames all MIDI data into 16-byte frames with a timestamp from the monotonic_raw clock. The main benefit is that we can get accurate timestamps even if userspace wakeup and processing is not immediate. Signed-off-by: David Henningsson --- v2: Fixed checkpatch errors. include/sound/rawmidi.h | 1 + include/uapi/sound/asound.h | 18 ++++++++++++++- sound/core/rawmidi.c | 45 ++++++++++++++++++++++++++++++++++++- 3 files changed, 62 insertions(+), 2 deletions(-) diff --git a/include/sound/rawmidi.h b/include/sound/rawmidi.h index 334842daa904..4ba5d2deec18 100644 --- a/include/sound/rawmidi.h +++ b/include/sound/rawmidi.h @@ -81,6 +81,7 @@ struct snd_rawmidi_substream { bool opened; /* open flag */ bool append; /* append flag (merge more streams) */ bool active_sensing; /* send active sensing when close */ + u8 framing; /* whether to frame data (for input) */ int use_count; /* use counter (for output) */ size_t bytes; struct snd_rawmidi *rmidi; diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index 535a7229e1d9..f33076755025 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -736,12 +736,28 @@ struct snd_rawmidi_info { unsigned char reserved[64]; /* reserved for future use */ }; +enum { + SNDRV_RAWMIDI_FRAMING_NONE = 0, + SNDRV_RAWMIDI_FRAMING_TSTAMP_MONOTONIC_RAW, + SNDRV_RAWMIDI_FRAMING_LAST = SNDRV_RAWMIDI_FRAMING_TSTAMP_MONOTONIC_RAW, +}; + +#define SND_RAWMIDI_FRAMING_DATA_LENGTH 7 + +struct snd_rawmidi_framing_tstamp { + unsigned int tv_sec; /* seconds */ + unsigned int tv_nsec; /* nanoseconds */ + unsigned char length; + unsigned char data[SND_RAWMIDI_FRAMING_DATA_LENGTH]; +}; + struct snd_rawmidi_params { int stream; size_t buffer_size; /* queue size in bytes */ size_t avail_min; /* minimum avail bytes for wakeup */ unsigned int no_active_sensing: 1; /* do not send active sensing byte in close() */ - unsigned char reserved[16]; /* reserved for future use */ + unsigned char framing; /* For input data only, frame incoming data */ + unsigned char reserved[15]; /* reserved for future use */ }; #ifndef __KERNEL__ diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c index aca00af93afe..cd927ba178a6 100644 --- a/sound/core/rawmidi.c +++ b/sound/core/rawmidi.c @@ -721,6 +721,7 @@ int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream, struct snd_rawmidi_params *params) { snd_rawmidi_drain_input(substream); + substream->framing = params->framing; return resize_runtime_buffer(substream->runtime, params, true); } EXPORT_SYMBOL(snd_rawmidi_input_params); @@ -963,6 +964,44 @@ static int snd_rawmidi_control_ioctl(struct snd_card *card, return -ENOIOCTLCMD; } +static int receive_with_tstamp_framing(struct snd_rawmidi_substream *substream, + const unsigned char *buffer, int src_count, struct timespec64 *tstamp) +{ + struct snd_rawmidi_runtime *runtime = substream->runtime; + struct snd_rawmidi_framing_tstamp frame; + struct snd_rawmidi_framing_tstamp *dest_ptr; + int dest_frames = 0; + int frame_size = sizeof(struct snd_rawmidi_framing_tstamp); + + frame.tv_sec = tstamp->tv_sec; + frame.tv_nsec = tstamp->tv_nsec; + if (snd_BUG_ON(runtime->hw_ptr & 15 || runtime->buffer_size & 15 || frame_size != 16)) + return -EINVAL; + + while (src_count > 0) { + if ((int)(runtime->buffer_size - runtime->avail) < frame_size) { + runtime->xruns += src_count; + return dest_frames * frame_size; + } + if (src_count >= SND_RAWMIDI_FRAMING_DATA_LENGTH) + frame.length = SND_RAWMIDI_FRAMING_DATA_LENGTH; + else { + frame.length = src_count; + memset(frame.data, 0, SND_RAWMIDI_FRAMING_DATA_LENGTH); + } + memcpy(frame.data, buffer, frame.length); + buffer += frame.length; + src_count -= frame.length; + dest_ptr = (struct snd_rawmidi_framing_tstamp *) (runtime->buffer + runtime->hw_ptr); + *dest_ptr = frame; + runtime->avail += frame_size; + runtime->hw_ptr += frame_size; + runtime->hw_ptr %= runtime->buffer_size; + dest_frames++; + } + return dest_frames * frame_size; +} + /** * snd_rawmidi_receive - receive the input data from the device * @substream: the rawmidi substream @@ -977,6 +1016,7 @@ int snd_rawmidi_receive(struct snd_rawmidi_substream *substream, const unsigned char *buffer, int count) { unsigned long flags; + struct timespec64 ts64; int result = 0, count1; struct snd_rawmidi_runtime *runtime = substream->runtime; @@ -988,7 +1028,10 @@ int snd_rawmidi_receive(struct snd_rawmidi_substream *substream, return -EINVAL; } spin_lock_irqsave(&runtime->lock, flags); - if (count == 1) { /* special case, faster code */ + if (substream->framing == SNDRV_RAWMIDI_FRAMING_TSTAMP_MONOTONIC_RAW) { + ktime_get_raw_ts64(&ts64); + result = receive_with_tstamp_framing(substream, buffer, count, &ts64); + } else if (count == 1) { /* special case, faster code */ substream->bytes++; if (runtime->avail < runtime->buffer_size) { runtime->buffer[runtime->hw_ptr++] = buffer[0];