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Tue, 17 Jan 2023 11:49:31 -0500 (EST) Date: Tue, 17 Jan 2023 17:49:28 +0100 From: Marek =?utf-8?Q?Marczykowski-G=C3=B3recki?= To: Takashi Iwai Subject: Re: Intel HD Audio: sound stops working in Xen PV dom0 in >=5.17 Message-ID: References: <87o7rv507o.wl-tiwai@suse.de> <87bkmya2zk.wl-tiwai@suse.de> <87tu0p8uda.wl-tiwai@suse.de> <87tu0p6xix.wl-tiwai@suse.de> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="C01NnvavSPu49EG9" Content-Disposition: inline In-Reply-To: <87tu0p6xix.wl-tiwai@suse.de> X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: alsa-devel@alsa-project.org, Harald Arnesen , Alex Xu Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" --C01NnvavSPu49EG9 Content-Type: text/plain; protected-headers=v1; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Date: Tue, 17 Jan 2023 17:49:28 +0100 From: Marek =?utf-8?Q?Marczykowski-G=C3=B3recki?= To: Takashi Iwai Cc: alsa-devel@alsa-project.org, Alex Xu , Harald Arnesen , Jaroslav Kysela Subject: Re: Intel HD Audio: sound stops working in Xen PV dom0 in >=5.17 On Tue, Jan 17, 2023 at 03:33:42PM +0100, Takashi Iwai wrote: > On Tue, 17 Jan 2023 15:21:23 +0100, > Marek Marczykowski-G=C3=B3recki wrote: > >=20 > > On Tue, Jan 17, 2023 at 12:36:28PM +0100, Marek Marczykowski-G=C3=B3rec= ki wrote: > > > On Tue, Jan 17, 2023 at 08:58:57AM +0100, Takashi Iwai wrote: > > > > On Mon, 16 Jan 2023 16:55:11 +0100, > > > > Takashi Iwai wrote: > > > > >=20 > > > > > On Tue, 27 Dec 2022 16:26:54 +0100, > > > > > Marek Marczykowski-G=C3=B3recki wrote: > > > > > >=20 > > > > > > On Thu, Dec 22, 2022 at 09:09:15AM +0100, Takashi Iwai wrote: > > > > > > > On Sat, 10 Dec 2022 17:17:42 +0100, > > > > > > > Marek Marczykowski-G=C3=B3recki wrote: > > > > > > > >=20 > > > > > > > > On Sat, Dec 10, 2022 at 02:00:06AM +0100, Marek Marczykowsk= i-G=C3=B3recki wrote: > > > > > > > > > On Fri, Dec 09, 2022 at 01:40:15PM +0100, Marek Marczykow= ski-G=C3=B3recki 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-G=C3=B3recki wrote: > > > > > > > > > > > >=20 > > > > > > > > > > > > Hi, > > > > > > > > > > > >=20 > > > > > > > > > > > > Under Xen PV dom0, with Linux >=3D 5.17, sound stop= s working after few > > > > > > > > > > > > hours. pavucontrol still shows meter bars moving, b= ut the speakers > > > > > > > > > > > > remain silent. At least on some occasions I see the= following message in > > > > > > > > > > > > dmesg: > > > > > > > > > > > >=20 > > > > > > > > > > > > [ 2142.484553] snd_hda_intel 0000:00:1f.3: Unstab= le LPIB (18144 >=3D 6396); disabling LPIB delay counting > > > > > > > > >=20 > > > > > > > > > Hit the issue again, this message did not appear in the l= og (or at least > > > > > > > > > not yet). > > > > > > > > >=20 > > > > > > > > > (...) > > > > > > > > >=20 > > > > > > > > > > > In anyway, please check the behavior with 6.1-rc8 + t= he commit > > > > > > > > > > > cc26516374065a34e10c9a8bf3e940e42cd96e2a > > > > > > > > > > > ALSA: memalloc: Allocate more contiguous pages fo= r fallback case > > > > > > > > > > > from for-next of my sound git tree (which will be in = 6.2-rc1). > > > > > > > > >=20 > > > > > > > > > This did not helped. > > > > > > > > >=20 > > > > > > > > > > Looking at the mentioned commits, there is one specific= aspect of Xen PV > > > > > > > > > > that may be relevant. It configures PAT differently tha= n native Linux. > > > > > > > > > > Theoretically Linux adapts automatically and using prop= er API (like > > > > > > > > > > set_memory_wc()) should just work, but at least for i91= 5 driver it > > > > > > > > > > causes issues (not fully tracked down yet). Details abo= ut that bug > > > > > > > > > > report include some more background: > > > > > > > > > > https://lore.kernel.org/intel-gfx/Y5Hst0bCxQDTN7lK@mail= -itl/ > > > > > > > > > >=20 > > > > > > > > > > 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. > > > > > > > > > >=20 > > > > > > > > > > > If the problem persists, another thing to check is th= e hack below > > > > > > > > > > > works. > > > > > > > > >=20 > > > > > > > > > Trying this one now. > > > > > > > >=20 > > > > > > > > And this one didn't either :/ > > > > > > >=20 > > > > > > > (Sorry for the late reply, as I've been off in the last weeks= =2E) > > > > > > >=20 > > > > > > > I think the hack doesn't influence on the PCM buffer pages, b= ut only > > > > > > > about BDL pages. Could you check the patch below instead? > > > > > > > It'll disable the SG-buffer handling on x86 completely.=20 > > > > > >=20 > > > > > > This seems to "fix" the issue, thanks! > > > > > > I guess I'll run it this way for now, but a proper solution wou= ld be > > > > > > nice. Let me know if I can collect any more info that would hel= p with > > > > > > that. > > > > >=20 > > > > > Then we seem to go back again with the coherent memory allocation= for > > > > > the fallback sg cases. It was changed because the use of > > > > > dma_alloc_coherent() caused a problem with IOMMU case for retriev= ing > > > > > the page addresses, but since the commit 9736a325137b, we essenti= ally > > > > > avoid the fallback when IOMMU is used, so it should be fine again. > > > > >=20 > > > > > Let me know if the patch like below works for you instead of the > > > > > previous hack to disable SG-buffer (note: totally untested!) > > > >=20 > > > > Gah, there was an obvious typo, scratch that. > > > >=20 > > > > Below is a proper patch. Please try this one instead. > > >=20 > > > Thanks, I'll give it a try. > >=20 > > Unfortunately, it doesn't help, it stopped working again, after about 3h > > uptime. >=20 > Aha, then it might be rather other way round; > dma_alloc_noncontiguous() doesn't work on Xen properly. >=20 > Could you try the one below instead of the previous? Unfortunately, this one doesn't fix it either :/ --=20 Best Regards, Marek Marczykowski-G=C3=B3recki Invisible Things Lab --C01NnvavSPu49EG9 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEhrpukzGPukRmQqkK24/THMrX1ywFAmPG0ZkACgkQ24/THMrX 1yxsogf/dexma9FI8fBC4rg26qYqFUKFWuet48JuKJFZ87I7I9iEilCW2bpmZfTk fqs28/W2LMPtOGhvDFWRt+py1QLyqlYtDFZ1HoXMDDYi4WceE4sGd5oBhrYvGNiA IfCD436OpD2VfiO8XN4Jr6RPUEtw55eZ6+m2dEzMWtiptv9gdFcQHpSyFZnzsCiV oXMw0Q34ltzTApoGCe7lYF5xbUGdUajPl6mESQPNLse+69EPBJ2eUcnw0GCUDOr/ b6hq5mppromIn9e611we9yayiysHqzhvm8e0RSnsNNAe8mnJ+YgqUMM4LrZVPfQn X8kaBsdEbA0cGdxc96u08aqzRU/mLg== =42jv -----END PGP SIGNATURE----- --C01NnvavSPu49EG9--