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| author |   Takashi Iwai <tiwai@suse.de> | 2019-12-10 15:57:27 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2019-12-10 18:22:46 +0100 |
| commit | 88452da92ba2b264a3922218c2cec13aac51c502 (patch) | |
| tree | 1545882c83bb54b9de07d6adc7c5d46cf65c89d4 /sound/hda | |
| parent | Merge branch 'for-linus' into for-next (diff) | |
| download | wireguard-linux-88452da92ba2b264a3922218c2cec13aac51c502.tar.xz wireguard-linux-88452da92ba2b264a3922218c2cec13aac51c502.zip | |
ALSA: hda: Use standard waitqueue for RIRB wakeup
The HD-audio CORB/RIRB communication was programmed in a way that was
documented in the reference in decades ago, which is essentially a
polling in the waiter side. It's working fine but costs CPU cycles on
some platforms that support only slow communications. Also, for some
platforms that had unreliable communications, we put longer wait time
(2 ms), which accumulate quite long time if you execute many verbs in
a shot (e.g. at the initialization or resume phase).
This patch attempts to improve the situation by introducing the
standard waitqueue in the RIRB waiter side instead of polling. The
test results on my machine show significant improvements. The time
spent for "cat /proc/asound/card*/codec#*" were changed like:
* Intel SKL + Realtek codec
before the patch:
0.00user 0.04system 0:00.10elapsed 40.0%CPU
after the patch:
0.00user 0.01system 0:00.10elapsed 10.0%CPU
* Nvidia GP107GL + Nvidia HDMI codec
before the patch:
0.00user 0.00system 0:02.76elapsed 0.0%CPU
after the patch:
0.00user 0.00system 0:00.01elapsed 17.0%CPU
So, for Intel chips, the total time is same, while the total time is
greatly reduced (from 2.76 to 0.01s) for Nvidia chips.
The only negative data here is the increase of CPU time for Nvidia,
but this is the unavoidable cost for faster wakeups, supposedly.
Link: https://lore.kernel.org/r/20191210145727.22054-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/hda')
| -rw-r--r-- | sound/hda/hdac_bus.c | 1 | ||||
| -rw-r--r-- | sound/hda/hdac_controller.c | 3 |
2 files changed, 4 insertions, 0 deletions
diff --git a/sound/hda/hdac_bus.c b/sound/hda/hdac_bus.c index 8f19876244eb..48b227fff204 100644 --- a/sound/hda/hdac_bus.c +++ b/sound/hda/hdac_bus.c @@ -43,6 +43,7 @@ int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev, mutex_init(&bus->cmd_mutex); mutex_init(&bus->lock); INIT_LIST_HEAD(&bus->hlink_list); + init_waitqueue_head(&bus->rirb_wq); bus->irq = -1; return 0; } diff --git a/sound/hda/hdac_controller.c b/sound/hda/hdac_controller.c index 7e7be8e4dcf9..cd1c3b282657 100644 --- a/sound/hda/hdac_controller.c +++ b/sound/hda/hdac_controller.c @@ -216,6 +216,9 @@ void snd_hdac_bus_update_rirb(struct hdac_bus *bus) else if (bus->rirb.cmds[addr]) { bus->rirb.res[addr] = res; bus->rirb.cmds[addr]--; + if (!bus->rirb.cmds[addr] && + waitqueue_active(&bus->rirb_wq)) + wake_up(&bus->rirb_wq); } else { dev_err_ratelimited(bus->dev, "spurious response %#x:%#x, last cmd=%#08x\n", |