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Tue, 17 Jan 2023 09:21:27 -0500 (EST) Date: Tue, 17 Jan 2023 15:21:23 +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: <87tu256lqs.wl-tiwai@suse.de> <87o7rv507o.wl-tiwai@suse.de> <87bkmya2zk.wl-tiwai@suse.de> <87tu0p8uda.wl-tiwai@suse.de> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="N+9rIOsGUTd0E7/R" Content-Disposition: inline In-Reply-To: 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" --N+9rIOsGUTd0E7/R Content-Type: text/plain; protected-headers=v1; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Date: Tue, 17 Jan 2023 15:21:23 +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 12:36:28PM +0100, Marek Marczykowski-G=C3=B3recki w= rote: > 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 Marczykowski-G= =C3=B3recki wrote: > > > > > > > On Fri, Dec 09, 2022 at 01:40:15PM +0100, Marek Marczykowski-= G=C3=B3recki wrote: > > > > > > > > On Fri, Dec 09, 2022 at 09:10:19AM +0100, Takashi Iwai wrot= e: > > > > > > > > > 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 stops wo= rking after few > > > > > > > > > > hours. pavucontrol still shows meter bars moving, but t= he speakers > > > > > > > > > > remain silent. At least on some occasions I see the fol= lowing message in > > > > > > > > > > dmesg: > > > > > > > > > >=20 > > > > > > > > > > [ 2142.484553] snd_hda_intel 0000:00:1f.3: Unstable L= PIB (18144 >=3D 6396); disabling LPIB delay counting > > > > > > >=20 > > > > > > > Hit the issue again, this message did not appear in the log (= or at least > > > > > > > not yet). > > > > > > >=20 > > > > > > > (...) > > > > > > >=20 > > > > > > > > > In anyway, please check the behavior with 6.1-rc8 + the c= ommit > > > > > > > > > cc26516374065a34e10c9a8bf3e940e42cd96e2a > > > > > > > > > ALSA: memalloc: Allocate more contiguous pages for fa= llback 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 asp= ect of Xen PV > > > > > > > > that may be relevant. It configures PAT differently than na= tive Linux. > > > > > > > > Theoretically Linux adapts automatically and using proper A= PI (like > > > > > > > > set_memory_wc()) should just work, but at least for i915 dr= iver it > > > > > > > > causes issues (not fully tracked down yet). Details about t= hat 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 the ha= ck 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.) > > > > >=20 > > > > > I think the hack doesn't influence on the PCM buffer pages, but o= nly > > > > > 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 would be > > > > nice. Let me know if I can collect any more info that would help wi= th > > > > 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 retrieving > > > the page addresses, but since the commit 9736a325137b, we essentially > > > 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. Unfortunately, it doesn't help, it stopped working again, after about 3h uptime. --=20 Best Regards, Marek Marczykowski-G=C3=B3recki Invisible Things Lab --N+9rIOsGUTd0E7/R Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEhrpukzGPukRmQqkK24/THMrX1ywFAmPGruQACgkQ24/THMrX 1yxyFAf/W1JBrWHfmcbVOSaX+6UP6M0KO6IUOxp9s4+G/81CyHges3SgqjooFIyj bc8dXx10ium6TDtE6+uEkrLxgqy8QB6iLEIFRm3XUF5I1n+3AwbXh+oVlai8tuzl KrHGRmXBol4ba+uEJGh8RDZe3QtmZ7unlTnkXenJG7i7rRMuJrgjGdcHgBHHKSfE DQvJMpHl0YnepIXPpR7nq/2tKw+FJnfudxhD5l2grmfZsISDzUMgsT98lneUo9hP y2pK+VuzrupTlR/li+x+sKcUq8Ryluylz2rWumwp0IJowutiIx0jeS7oGdSUw8Kb t+1+UPZ8cFro/jhWE6piDOGxgxjrXQ== =+plH -----END PGP SIGNATURE----- --N+9rIOsGUTd0E7/R--