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| author | Takashi Iwai <tiwai@suse.de> | 2023-08-15 22:01:13 +0300 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2023-08-18 13:18:15 +0300 |
| commit | cf393babb37a1679a1ec1d864df1090353465e23 (patch) | |
| tree | 9e1595f6a6ebed9564665a02e307f57da1d40eff /include/sound | |
| parent | 70e969eb235ee6a030ff140b1852b598bf66f9c8 (diff) | |
| download | linux-cf393babb37a1679a1ec1d864df1090353465e23.tar.xz | |
ALSA: pcm: Add copy ops with iov_iter
iov_iter is a universal interface to copy the data chunk from/to
user-space and kernel in a unified manner. This API can fit for ALSA
PCM copy ops, too; we had to split to copy_user and copy_kernel in the
past, and those can be unified to a single ops with iov_iter.
This patch adds a new PCM copy ops that passes iov_iter for copying
both kernel and user-space in the same way. This patch touches only
the ALSA PCM core part, and the actual users will be replaced in the
following patches.
The expansion of iov_iter is done in the PCM core right before calling
each copy callback. It's a bit suboptimal, but I took this now as
it's the most straightforward replacement. The more conversion to
iov_iter in the caller side is a TODO for future.
As of now, the old copy_user and copy_kernel ops are still kept.
Once after all users are converted, we'll drop the old copy_user and
copy_kernel ops, too.
Link: https://lore.kernel.org/r/20230815190136.8987-3-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'include/sound')
| -rw-r--r-- | include/sound/pcm.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/sound/pcm.h b/include/sound/pcm.h index 0243a13e9ac4..6d6ec51ddfc1 100644 --- a/include/sound/pcm.h +++ b/include/sound/pcm.h @@ -16,6 +16,7 @@ #include <linux/bitops.h> #include <linux/pm_qos.h> #include <linux/refcount.h> +#include <linux/uio.h> #define snd_pcm_substream_chip(substream) ((substream)->private_data) #define snd_pcm_chip(pcm) ((pcm)->private_data) @@ -68,6 +69,8 @@ struct snd_pcm_ops { struct snd_pcm_audio_tstamp_report *audio_tstamp_report); int (*fill_silence)(struct snd_pcm_substream *substream, int channel, unsigned long pos, unsigned long bytes); + int (*copy)(struct snd_pcm_substream *substream, int channel, + unsigned long pos, struct iov_iter *iter, unsigned long bytes); int (*copy_user)(struct snd_pcm_substream *substream, int channel, unsigned long pos, void __user *buf, unsigned long bytes); |