linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
* [REGRESSION 5.19.x] AMD HD-audio devices missing on 5.19
@ 2022-08-22 14:12 Takashi Iwai
  2022-08-23  1:00 ` Jason Gunthorpe
  2022-08-24  7:13 ` Thorsten Leemhuis
  0 siblings, 2 replies; 19+ messages in thread
From: Takashi Iwai @ 2022-08-22 14:12 UTC (permalink / raw)
  To: Lu Baolu
  Cc: Joerg Roedel, Greg Kroah-Hartman, Bjorn Helgaas, Jason Gunthorpe,
	Robin Murphy, Eric Auger, regressions, linux-kernel

Hi,

we've received regression reports about the missing HD-audio devices
on AMD platforms, and this turned out to be caused by the commit
512881eacfa72c2136b27b9934b7b27504a9efc2
    bus: platform,amba,fsl-mc,PCI: Add device DMA ownership management

The details are found in openSUSE bugzilla:
  https://bugzilla.suse.com/show_bug.cgi?id=1202492

The problem seems to be that HD-audio (both onboard analog and HDMI)
PCI devices are assigned to the same IOMMU group as AMD graphics PCI
device, and once after the AMDGPU is initialized beforehand, those
audio devices can't be probed since iommu_device_use_default_domain()
returns -EBUSY.

I'm not sure whether it's specific to PCI bus due to the assignment
logic of those IOMMU groups, or it's about the handling of the active
domain assignment.  In anyway, disabling IOMMU works around the
problem, and passing driver_managed_dma flag to the HD-audio driver
was also confirmed to work around it, too.

The problem persists with 6.0-rc1 kernel.

If you have / can give any fix patch or debug patch, let me know; I'll
build test kernels and ask the reporters.


thanks,

Takashi

^ permalink raw reply	[flat|nested] 19+ messages in thread

end of thread, other threads:[~2022-09-19 15:24 UTC | newest]

Thread overview: 19+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-08-22 14:12 [REGRESSION 5.19.x] AMD HD-audio devices missing on 5.19 Takashi Iwai
2022-08-23  1:00 ` Jason Gunthorpe
2022-08-23  6:06   ` Takashi Iwai
2022-08-23 11:46     ` Takashi Iwai
2022-08-23 20:28       ` Jason Gunthorpe
2022-08-23 21:01         ` Robin Murphy
2022-08-24  0:02           ` Jason Gunthorpe
2022-09-06 15:41         ` Jason Gunthorpe
2022-09-06 15:52           ` Takashi Iwai
2022-09-06 15:53             ` Jason Gunthorpe
2022-09-06 16:04               ` Takashi Iwai
2022-09-06 16:08                 ` Jason Gunthorpe
2022-09-06 16:16                   ` Takashi Iwai
2022-09-07 10:08                     ` Takashi Iwai
2022-09-07 13:28         ` Takashi Iwai
2022-09-07 13:48           ` Jason Gunthorpe
2022-09-08  6:23             ` Takashi Iwai
2022-08-24  7:13 ` Thorsten Leemhuis
2022-09-19 15:23   ` [REGRESSION 5.19.x] AMD HD-audio devices missing on 5.19 #forregzbot Thorsten Leemhuis

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).