For supporting the explicit in-kernel copy of PCM buffer data, and also for further code refactoring, three new PCM ops, copy_user, copy_kernel and fill_silence, are introduced. The old copy and silence ops will be deprecated and removed later once when all callers are converted.
The copy_kernel ops is the new one, and it's supposed to transfer the PCM data from the given kernel buffer to the hardware ring-buffer (or vice-versa depending on the stream direction), while the copy_user ops is equivalent with the former copy ops, to transfer the data from the user-space buffer.
The major difference of the new copy_* and fill_silence ops from the previous ops is that the new ops take bytes instead of frames for size and position arguments. It has two merits: first, it allows the callback implementation often simpler (just call directly memcpy() & co), and second, it may unify the implementations of both interleaved and non-interleaved cases, as we'll see in the later patch.
As of this stage, copy_kernel ops isn't referred yet, but only copy_user is used.
Signed-off-by: Takashi Iwai tiwai@suse.de --- include/sound/pcm.h | 7 +++++ sound/core/pcm_lib.c | 89 +++++++++++++++++++++++++++++++++++++++++++--------- sound/soc/soc-pcm.c | 3 ++ 3 files changed, 84 insertions(+), 15 deletions(-)
diff --git a/include/sound/pcm.h b/include/sound/pcm.h index c609b891c4c2..a065415191d8 100644 --- a/include/sound/pcm.h +++ b/include/sound/pcm.h @@ -83,6 +83,13 @@ struct snd_pcm_ops { void __user *buf, snd_pcm_uframes_t count); int (*silence)(struct snd_pcm_substream *substream, int channel, snd_pcm_uframes_t pos, snd_pcm_uframes_t count); + int (*fill_silence)(struct snd_pcm_substream *substream, int channel, + unsigned long pos, unsigned long bytes); + int (*copy_user)(struct snd_pcm_substream *substream, int channel, + unsigned long pos, void __user *buf, + unsigned long bytes); + int (*copy_kernel)(struct snd_pcm_substream *substream, int channel, + unsigned long pos, void *buf, unsigned long bytes); struct page *(*page)(struct snd_pcm_substream *substream, unsigned long offset); int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma); diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c index ab4b1d1e44ee..9334fc2c20c8 100644 --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -55,6 +55,8 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram { struct snd_pcm_runtime *runtime = substream->runtime; snd_pcm_uframes_t frames, ofs, transfer; + char *hwbuf; + int err;
if (runtime->silence_size < runtime->boundary) { snd_pcm_sframes_t noise_dist, n; @@ -109,27 +111,37 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames; if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) { - if (substream->ops->silence) { - int err; + if (substream->ops->fill_silence) { + err = substream->ops->fill_silence(substream, 0, + frames_to_bytes(runtime, ofs), + frames_to_bytes(runtime, transfer)); + snd_BUG_ON(err < 0); + } else if (substream->ops->silence) { err = substream->ops->silence(substream, -1, ofs, transfer); snd_BUG_ON(err < 0); } else { - char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs); + hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs); snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels); } } else { unsigned int c; unsigned int channels = runtime->channels; - if (substream->ops->silence) { + if (substream->ops->fill_silence) { + for (c = 0; c < channels; ++c) { + err = substream->ops->fill_silence(substream, c, + samples_to_bytes(runtime, ofs), + samples_to_bytes(runtime, transfer)); + snd_BUG_ON(err < 0); + } + } else if (substream->ops->silence) { for (c = 0; c < channels; ++c) { - int err; err = substream->ops->silence(substream, c, ofs, transfer); snd_BUG_ON(err < 0); } } else { size_t dma_csize = runtime->dma_bytes / channels; for (c = 0; c < channels; ++c) { - char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs); + hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs); snd_pcm_format_set_silence(runtime->format, hwbuf, transfer); } } @@ -1995,7 +2007,13 @@ static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream, struct snd_pcm_runtime *runtime = substream->runtime; int err; char __user *buf = (char __user *) data + frames_to_bytes(runtime, off); - if (substream->ops->copy) { + if (substream->ops->copy_user) { + hwoff = frames_to_bytes(runtime, hwoff); + frames = frames_to_bytes(runtime, frames); + err = substream->ops->copy_user(substream, 0, hwoff, buf, frames); + if (err < 0) + return err; + } else if (substream->ops->copy) { if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0) return err; } else { @@ -2119,7 +2137,8 @@ static int pcm_sanity_check(struct snd_pcm_substream *substream) if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; runtime = substream->runtime; - if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area)) + if (snd_BUG_ON(!substream->ops->copy_user && !substream->ops->copy + && !runtime->dma_area)) return -EINVAL; if (runtime->status->state == SNDRV_PCM_STATE_OPEN) return -EBADFD; @@ -2156,8 +2175,30 @@ static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream, int err; void __user **bufs = (void __user **)data; int channels = runtime->channels; + char __user *buf; int c; - if (substream->ops->copy) { + + if (substream->ops->copy_user) { + hwoff = samples_to_bytes(runtime, hwoff); + off = samples_to_bytes(runtime, off); + frames = samples_to_bytes(runtime, frames); + for (c = 0; c < channels; ++c, ++bufs) { + buf = *bufs + off; + if (!*bufs) { + if (snd_BUG_ON(!substream->ops->fill_silence)) + return -EINVAL; + err = substream->ops->fill_silence(substream, c, + hwoff, + frames); + } else { + err = substream->ops->copy_user(substream, c, + hwoff, buf, + frames); + } + if (err < 0) + return err; + } + } else if (substream->ops->copy) { if (snd_BUG_ON(!substream->ops->silence)) return -EINVAL; for (c = 0; c < channels; ++c, ++bufs) { @@ -2165,7 +2206,7 @@ static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream, if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0) return err; } else { - char __user *buf = *bufs + samples_to_bytes(runtime, off); + buf = *bufs + samples_to_bytes(runtime, off); if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0) return err; } @@ -2217,7 +2258,13 @@ static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream, struct snd_pcm_runtime *runtime = substream->runtime; int err; char __user *buf = (char __user *) data + frames_to_bytes(runtime, off); - if (substream->ops->copy) { + if (substream->ops->copy_user) { + hwoff = frames_to_bytes(runtime, hwoff); + frames = frames_to_bytes(runtime, frames); + err = substream->ops->copy_user(substream, 0, hwoff, buf, frames); + if (err < 0) + return err; + } else if (substream->ops->copy) { if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0) return err; } else { @@ -2365,10 +2412,24 @@ static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream, int err; void __user **bufs = (void __user **)data; int channels = runtime->channels; + char __user *buf; + char *hwbuf; int c; - if (substream->ops->copy) { + + if (substream->ops->copy_user) { + hwoff = samples_to_bytes(runtime, hwoff); + off = samples_to_bytes(runtime, off); + frames = samples_to_bytes(runtime, frames); + for (c = 0; c < channels; ++c, ++bufs) { + if (!*bufs) + continue; + err = substream->ops->copy_user(substream, c, hwoff, + *bufs + off, frames); + if (err < 0) + return err; + } + } else if (substream->ops->copy) { for (c = 0; c < channels; ++c, ++bufs) { - char __user *buf; if (*bufs == NULL) continue; buf = *bufs + samples_to_bytes(runtime, off); @@ -2378,8 +2439,6 @@ static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream, } else { snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels; for (c = 0; c < channels; ++c, ++bufs) { - char *hwbuf; - char __user *buf; if (*bufs == NULL) continue;
diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c index efc5831f205d..8867ed9e5f56 100644 --- a/sound/soc/soc-pcm.c +++ b/sound/soc/soc-pcm.c @@ -2743,6 +2743,9 @@ int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
if (platform->driver->ops) { rtd->ops.ack = platform->driver->ops->ack; + rtd->ops.copy_user = platform->driver->ops->copy_user; + rtd->ops.copy_kernel = platform->driver->ops->copy_kernel; + rtd->ops.fill_silence = platform->driver->ops->fill_silence; rtd->ops.copy = platform->driver->ops->copy; rtd->ops.silence = platform->driver->ops->silence; rtd->ops.page = platform->driver->ops->page;