On Fri, Dec 09, 2022 at 01:40:15PM +0100, Marek Marczykowski-Górecki wrote: > On Fri, Dec 09, 2022 at 09:10:19AM +0100, Takashi Iwai wrote: > > On Fri, 09 Dec 2022 02:27:30 +0100, > > Marek Marczykowski-Górecki wrote: > > > > > > Hi, > > > > > > Under Xen PV dom0, with Linux >= 5.17, sound stops working after few > > > hours. pavucontrol still shows meter bars moving, but the speakers > > > remain silent. At least on some occasions I see the following message in > > > dmesg: > > > > > > [ 2142.484553] snd_hda_intel 0000:00:1f.3: Unstable LPIB (18144 >= 6396); disabling LPIB delay counting Hit the issue again, this message did not appear in the log (or at least not yet). (...) > > In anyway, please check the behavior with 6.1-rc8 + the commit > > cc26516374065a34e10c9a8bf3e940e42cd96e2a > > ALSA: memalloc: Allocate more contiguous pages for fallback case > > from for-next of my sound git tree (which will be in 6.2-rc1). This did not helped. > Looking at the mentioned commits, there is one specific aspect of Xen PV > that may be relevant. It configures PAT differently than native Linux. > Theoretically Linux adapts automatically and using proper API (like > set_memory_wc()) should just work, but at least for i915 driver it > causes issues (not fully tracked down yet). Details about that bug > report include some more background: > https://lore.kernel.org/intel-gfx/Y5Hst0bCxQDTN7lK@mail-itl/ > > Anyway, I have tested it on a Xen modified to setup PAT the same way as > native Linux and the audio issue is still there. > > > If the problem persists, another thing to check is the hack below > > works. Trying this one now. > > -- 8< -- > > --- a/sound/pci/hda/hda_intel.c > > +++ b/sound/pci/hda/hda_intel.c > > @@ -1808,9 +1808,16 @@ static int azx_create(struct snd_card *card, struct pci_dev *pci, > > if (err < 0) > > return err; > > > > +#if 0 > > /* use the non-cached pages in non-snoop mode */ > > if (!azx_snoop(chip)) > > azx_bus(chip)->dma_type = SNDRV_DMA_TYPE_DEV_WC_SG; > > +#else > > + if (!azx_snoop(chip)) > > + azx_bus(chip)->dma_type = SNDRV_DMA_TYPE_DEV_SG; > > + else > > + azx_bus(chip)->dma_type = SNDRV_DMA_TYPE_DEV; > > +#endif > > > > if (chip->driver_type == AZX_DRIVER_NVIDIA) { > > dev_dbg(chip->card->dev, "Enable delay in RIRB handling\n"); -- Best Regards, Marek Marczykowski-Górecki Invisible Things Lab
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