Bug 237357

Summary:	Not resuming from suspend with IOMMU DMAR enabled
Product:	Base System	Reporter:	Val Packett <val>
Component:	kern	Assignee:	freebsd-bugs (Nobody) <bugs>
Status:	New ---
Severity:	Affects Only Me
Priority:	---
Version:	CURRENT
Hardware:	Any
OS:	Any

Description Val Packett 2019-04-18 08:01:11 UTC

With hw.dmar.enable=1, this Haswell laptop doesn't wake up from S3, similar symptoms to what it was doing when the TPM was enabled: no reaction to lid open / power button press, power LED keeps blinking.

Comment 1 Val Packett 2019-10-03 22:45:06 UTC

Same on a Kaby Lake laptop, I guess the dmar driver just doesn't handle suspend-resume correctly.

Comment 2 Val Packett 2019-10-05 14:28:00 UTC

Actually, I recall vmm.ko also breaking suspend.

The only suspend method I see in sys/amd64/vmm is in AMD ivrs_drv.c.

sys/x86/iommu/intel_drv.c has suspend/resume methods but they're blank. That explains things.

Comment 3 Val Packett 2019-12-29 17:48:16 UTC

( WIP code at https://reviews.freebsd.org/D22642 )