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[85.223.209.52]) by smtp.gmail.com with ESMTPSA id f136sm399062lff.34.2017.08.07.00.43.43 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 07 Aug 2017 00:43:44 -0700 (PDT) From: Oleksandr Andrushchenko To: alsa-devel@alsa-project.org, xen-devel@lists.xen.org, linux-kernel@vger.kernel.org Date: Mon, 7 Aug 2017 10:43:14 +0300 Message-Id: <1502091796-14413-10-git-send-email-andr2000@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1502091796-14413-1-git-send-email-andr2000@gmail.com> References: <1502091796-14413-1-git-send-email-andr2000@gmail.com> Cc: andr2000@gmail.com, Oleksandr Andrushchenko , tiwai@suse.com, perex@perex.cz Subject: [Xen-devel] [PATCH 09/11] ALSA: vsnd: Implement ALSA PCM operations X-BeenThere: xen-devel@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Oleksandr Andrushchenko Implement ALSA driver operations including: - start/stop period interrupt emulation - manage frontend/backend shraed buffers - manage Xen bus event channel state Signed-off-by: Oleksandr Andrushchenko --- sound/drivers/xen-front.c | 175 ++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 163 insertions(+), 12 deletions(-) diff --git a/sound/drivers/xen-front.c b/sound/drivers/xen-front.c index 507c5eb343c8..7275e9cb38c0 100644 --- a/sound/drivers/xen-front.c +++ b/sound/drivers/xen-front.c @@ -151,6 +151,11 @@ struct xdrv_info { struct sdev_card_plat_data cfg_plat_data; }; +static inline void sh_buf_clear(struct sh_buf_info *buf); +static void sh_buf_free(struct sh_buf_info *buf); +static int sh_buf_alloc(struct xenbus_device *xb_dev, struct sh_buf_info *buf, + unsigned int buffer_size); + static struct sdev_pcm_stream_info *sdrv_stream_get( struct snd_pcm_substream *substream) { @@ -311,71 +316,217 @@ static void sdrv_copy_pcm_hw(struct snd_pcm_hardware *dst, static int sdrv_alsa_open(struct snd_pcm_substream *substream) { - return 0; + struct sdev_pcm_instance_info *pcm_instance = + snd_pcm_substream_chip(substream); + struct sdev_pcm_stream_info *stream = sdrv_stream_get(substream); + struct snd_pcm_runtime *runtime = substream->runtime; + struct xdrv_info *xdrv_info; + unsigned long flags; + int ret; + + sdrv_copy_pcm_hw(&runtime->hw, &stream->pcm_hw, &pcm_instance->pcm_hw); + runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID | + SNDRV_PCM_INFO_DOUBLE | + SNDRV_PCM_INFO_BATCH | + SNDRV_PCM_INFO_NONINTERLEAVED | + SNDRV_PCM_INFO_RESUME | + SNDRV_PCM_INFO_PAUSE); + runtime->hw.info |= SNDRV_PCM_INFO_INTERLEAVED; + + xdrv_info = pcm_instance->card_info->xdrv_info; + + ret = sdrv_alsa_timer_create(substream); + + spin_lock_irqsave(&xdrv_info->io_lock, flags); + sh_buf_clear(&stream->sh_buf); + stream->evt_chnl = &xdrv_info->evt_chnls[stream->unique_id]; + if (ret < 0) + stream->evt_chnl->state = EVTCHNL_STATE_DISCONNECTED; + else + stream->evt_chnl->state = EVTCHNL_STATE_CONNECTED; + spin_unlock_irqrestore(&xdrv_info->io_lock, flags); + return ret; } static int sdrv_alsa_close(struct snd_pcm_substream *substream) { + struct sdev_pcm_instance_info *pcm_instance = + snd_pcm_substream_chip(substream); + struct sdev_pcm_stream_info *stream = sdrv_stream_get(substream); + struct xdrv_info *xdrv_info; + unsigned long flags; + + xdrv_info = pcm_instance->card_info->xdrv_info; + + sdrv_alsa_timer_stop(substream); + + spin_lock_irqsave(&xdrv_info->io_lock, flags); + stream->evt_chnl->state = EVTCHNL_STATE_DISCONNECTED; + spin_unlock_irqrestore(&xdrv_info->io_lock, flags); return 0; } static int sdrv_alsa_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { + struct sdev_pcm_instance_info *pcm_instance = + snd_pcm_substream_chip(substream); + struct sdev_pcm_stream_info *stream = sdrv_stream_get(substream); + struct xdrv_info *xdrv_info; + unsigned int buffer_size; + int ret; + + buffer_size = params_buffer_bytes(params); + sh_buf_clear(&stream->sh_buf); + xdrv_info = pcm_instance->card_info->xdrv_info; + ret = sh_buf_alloc(xdrv_info->xb_dev, + &stream->sh_buf, buffer_size); + if (ret < 0) + goto fail; return 0; + +fail: + dev_err(&xdrv_info->xb_dev->dev, + "Failed to allocate buffers for stream idx %d\n", + stream->unique_id); + return ret; } static int sdrv_alsa_hw_free(struct snd_pcm_substream *substream) { + struct sdev_pcm_instance_info *pcm_instance = + snd_pcm_substream_chip(substream); + struct sdev_pcm_stream_info *stream = sdrv_stream_get(substream); + struct xdrv_info *xdrv_info; + unsigned long flags; + + xdrv_info = pcm_instance->card_info->xdrv_info; + spin_lock_irqsave(&xdrv_info->io_lock, flags); + sh_buf_free(&stream->sh_buf); + spin_unlock_irqrestore(&xdrv_info->io_lock, flags); return 0; } static int sdrv_alsa_prepare(struct snd_pcm_substream *substream) { - return 0; + struct sdev_pcm_stream_info *stream = sdrv_stream_get(substream); + int ret = 0; + + if (!stream->is_open) + ret = sdrv_alsa_timer_prepare(substream); + return ret; } static int sdrv_alsa_trigger(struct snd_pcm_substream *substream, int cmd) { + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + /* fall through */ + case SNDRV_PCM_TRIGGER_RESUME: + return sdrv_alsa_timer_start(substream); + + case SNDRV_PCM_TRIGGER_STOP: + /* fall through */ + case SNDRV_PCM_TRIGGER_SUSPEND: + return sdrv_alsa_timer_stop(substream); + + default: + break; + } return 0; } static inline snd_pcm_uframes_t sdrv_alsa_pointer( struct snd_pcm_substream *substream) { + return sdrv_alsa_timer_pointer(substream); +} + +static int sdrv_alsa_playback_do_write(struct snd_pcm_substream *substream, + unsigned long pos, unsigned long count) +{ return 0; } static int sdrv_alsa_playback_copy_user(struct snd_pcm_substream *substream, - int channel, unsigned long pos, void __user *buf, - unsigned long bytes) + int channel, unsigned long pos, void __user *src, + unsigned long count) { - return 0; + struct sdev_pcm_stream_info *stream = sdrv_stream_get(substream); + + if (unlikely(pos + count > stream->sh_buf.vbuffer_sz)) + return -EINVAL; + + if (copy_from_user(stream->sh_buf.vbuffer + pos, src, count)) + return -EFAULT; + + return sdrv_alsa_playback_do_write(substream, pos, count); } static int sdrv_alsa_playback_copy_kernel(struct snd_pcm_substream *substream, - int channel, unsigned long pos, void *buf, unsigned long bytes) + int channel, unsigned long pos, void *src, unsigned long count) +{ + struct sdev_pcm_stream_info *stream = sdrv_stream_get(substream); + + if (unlikely(pos + count > stream->sh_buf.vbuffer_sz)) + return -EINVAL; + + memcpy(stream->sh_buf.vbuffer + pos, src, count); + return sdrv_alsa_playback_do_write(substream, pos, count); +} + +static int sdrv_alsa_playback_do_read(struct snd_pcm_substream *substream, + unsigned long pos, unsigned long count) { return 0; } static int sdrv_alsa_capture_copy_user(struct snd_pcm_substream *substream, - int channel, unsigned long pos, void __user *buf, - unsigned long bytes) + int channel, unsigned long pos, void __user *dst, + unsigned long count) { - return 0; + struct sdev_pcm_stream_info *stream = sdrv_stream_get(substream); + int ret; + + if (unlikely(pos + count > stream->sh_buf.vbuffer_sz)) + return -EINVAL; + + ret = sdrv_alsa_playback_do_read(substream, pos, count); + if (ret < 0) + return ret; + + return copy_to_user(dst, stream->sh_buf.vbuffer + pos, count) ? + -EFAULT : 0; } static int sdrv_alsa_capture_copy_kernel(struct snd_pcm_substream *substream, - int channel, unsigned long pos, void *buf, unsigned long bytes) + int channel, unsigned long pos, void *dst, unsigned long count) { + struct sdev_pcm_stream_info *stream = sdrv_stream_get(substream); + int ret; + + if (unlikely(pos + count > stream->sh_buf.vbuffer_sz)) + return -EINVAL; + + ret = sdrv_alsa_playback_do_read(substream, pos, count); + if (ret < 0) + return ret; + + memcpy(dst, stream->sh_buf.vbuffer + pos, count); return 0; } static int sdrv_alsa_playback_fill_silence(struct snd_pcm_substream *substream, - int channel, unsigned long pos, unsigned long bytes) + int channel, unsigned long pos, unsigned long count) { - return 0; + struct sdev_pcm_stream_info *stream = sdrv_stream_get(substream); + + if (unlikely(pos + count > stream->sh_buf.vbuffer_sz)) + return -EINVAL; + + memset(stream->sh_buf.vbuffer + pos, 0, count); + return sdrv_alsa_playback_do_write(substream, pos, count); } #define MAX_XEN_BUFFER_SIZE (64 * 1024)