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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 589F2C433F5 for ; Wed, 24 Nov 2021 12:42:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344621AbhKXMpb (ORCPT ); Wed, 24 Nov 2021 07:45:31 -0500 Received: from mail.kernel.org ([198.145.29.99]:50524 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344392AbhKXMme (ORCPT ); Wed, 24 Nov 2021 07:42:34 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 4C3F2613AB; Wed, 24 Nov 2021 12:25:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1637756712; bh=gu8Pjs6gsZ2rVa0pv1cUJn8Oh885K5YfGMixP2+fNA0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TpgLshIdfl7RFldiIbHBZLXWFV51j3GHkNcMkocjw7uCrnfuBF2WP+ktA/V7u3tSW 2TyAeC8kXgKl1DCyt4687HY1ZvMhraUlrdwBu33bxp7FI2RxBgxPguPQ+2NUYfQm6f qWfHISqzcDGcsQMo6IZncHbE1WK3XCpXNuWKBsk8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jens Axboe , Pierre-Louis Bossart , Takashi Iwai , Sasha Levin Subject: [PATCH 4.14 145/251] ALSA: hda: Reduce udelay() at SKL+ position reporting Date: Wed, 24 Nov 2021 12:56:27 +0100 Message-Id: <20211124115715.306750511@linuxfoundation.org> X-Mailer: git-send-email 2.34.0 In-Reply-To: <20211124115710.214900256@linuxfoundation.org> References: <20211124115710.214900256@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Takashi Iwai [ Upstream commit 46243b85b0ec5d2cee7545e5ce18c015ce91957e ] The position reporting on Intel Skylake and later chips via azx_get_pos_skl() contains a udelay(20) call for the capture streams. A call for this alone doesn't sound too harmful. However, as the pointer PCM ops is one of the hottest path in the PCM operations -- especially for the timer-scheduled operations like PulseAudio -- such a delay hogs CPU usage significantly in the total performance. The code there was taken from the original code in ASoC SST Skylake driver blindly. The udelay() is a workaround for the case where the reported position is behind the period boundary at the timing triggered from interrupts; applications often expect that the full data is available for the whole period when returned (and also that's the definition of the ALSA PCM period). OTOH, HD-audio (legacy) driver has already some workarounds for the delayed position reporting due to its relatively large FIFO, such as the BDL position adjustment and the delayed period-elapsed call in the work. That said, the udelay() is almost superfluous for HD-audio driver unlike SST, and we can drop the udelay(). Though, the current code doesn't guarantee the full period readiness as mentioned in the above, but rather it checks the wallclock and detects the unexpected jump. That's one missing piece, and the drop of udelay() needs a bit more sanity checks for the delayed handling. This patch implements those: the drop of udelay() call in azx_get_pos_skl() and the more proper check of hwptr in azx_position_ok(). The latter change is applied only for the case where the stream is running in the normal mode without no_period_wakeup flag. When no_period_wakeup is set, it essentially ignores the period handling and rather concentrates only on the current position; which implies that we don't need to care about the period boundary at all. Fixes: f87e7f25893d ("ALSA: hda - Improved position reporting on SKL+") Reported-by: Jens Axboe Reviewed-by: Pierre-Louis Bossart Link: https://lore.kernel.org/r/20210929072934.6809-2-tiwai@suse.de Signed-off-by: Takashi Iwai Signed-off-by: Sasha Levin --- sound/pci/hda/hda_intel.c | 28 +++++++++++++++++++++++----- 1 file changed, 23 insertions(+), 5 deletions(-) diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index e399c5718ee60..de090a3d2b384 100644 --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -742,13 +742,17 @@ static int azx_intel_link_power(struct azx *chip, bool enable) * the update-IRQ timing. The IRQ is issued before actually the * data is processed. So, we need to process it afterwords in a * workqueue. + * + * Returns 1 if OK to proceed, 0 for delay handling, -1 for skipping update */ static int azx_position_ok(struct azx *chip, struct azx_dev *azx_dev) { struct snd_pcm_substream *substream = azx_dev->core.substream; + struct snd_pcm_runtime *runtime = substream->runtime; int stream = substream->stream; u32 wallclk; unsigned int pos; + snd_pcm_uframes_t hwptr, target; wallclk = azx_readl(chip, WALLCLK) - azx_dev->core.start_wallclk; if (wallclk < (azx_dev->core.period_wallclk * 2) / 3) @@ -785,6 +789,24 @@ static int azx_position_ok(struct azx *chip, struct azx_dev *azx_dev) /* NG - it's below the first next period boundary */ return chip->bdl_pos_adj ? 0 : -1; azx_dev->core.start_wallclk += wallclk; + + if (azx_dev->core.no_period_wakeup) + return 1; /* OK, no need to check period boundary */ + + if (runtime->hw_ptr_base != runtime->hw_ptr_interrupt) + return 1; /* OK, already in hwptr updating process */ + + /* check whether the period gets really elapsed */ + pos = bytes_to_frames(runtime, pos); + hwptr = runtime->hw_ptr_base + pos; + if (hwptr < runtime->status->hw_ptr) + hwptr += runtime->buffer_size; + target = runtime->hw_ptr_interrupt + runtime->period_size; + if (hwptr < target) { + /* too early wakeup, process it later */ + return chip->bdl_pos_adj ? 0 : -1; + } + return 1; /* OK, it's fine */ } @@ -982,11 +1004,7 @@ static unsigned int azx_get_pos_skl(struct azx *chip, struct azx_dev *azx_dev) if (azx_dev->core.substream->stream == SNDRV_PCM_STREAM_PLAYBACK) return azx_skl_get_dpib_pos(chip, azx_dev); - /* For capture, we need to read posbuf, but it requires a delay - * for the possible boundary overlap; the read of DPIB fetches the - * actual posbuf - */ - udelay(20); + /* read of DPIB fetches the actual posbuf */ azx_skl_get_dpib_pos(chip, azx_dev); return azx_get_pos_posbuf(chip, azx_dev); } -- 2.33.0