Bug 197063

Summary:	iwlwifi: 7260: can't get any interrupt with intel_iommu=on
Product:	Drivers	Reporter:	Jonny Mako (jhnmlkvch9)
Component:	IOMMU	Assignee:	drivers_iommu
Status:	CLOSED CODE_FIX
Severity:	normal	CC:	A.Fiergolski+kernelBugzilla, luca
Priority:	P1
Hardware:	Intel
OS:	Linux
Kernel Version:	4.13.3-1-ARCH	Subsystem:
Regression:	Yes	Bisected commit-id:

Description Jonny Mako 2017-09-28 17:06:16 UTC

$ dmesg | grep iwl
[    9.990094] iwlwifi 0000:3d:00.0: enabling device (0000 -> 0002)
[   10.013099] iwlwifi 0000:3d:00.0: loaded firmware version 17.459231.0 op_mode iwlmvm
[   10.048453] iwlwifi 0000:3d:00.0: Detected Intel(R) Dual Band Wireless AC 7260, REV=0x144
[   15.196743] iwlwifi 0000:3d:00.0: Failed to load firmware chunk!
[   15.196808] iwlwifi 0000:3d:00.0: Could not load the [0] uCode section
[   15.196984] iwlwifi 0000:3d:00.0: Failed to start INIT ucode: -110
[   15.215869] iwlwifi 0000:3d:00.0: Failed to run INIT ucode: -110

Comment 1 Emmanuel Grumbach 2017-09-30 20:31:43 UTC

https://www.spinics.net/lists/linux-wireless/msg166018.html


Please check this

Comment 2 Jonny Mako 2017-10-02 00:40:59 UTC

Thanks for the response. However, that email was talking about 8260. My wifi card is 7260. It has been end of lifed by Intel. Hence the last firmware version that is supported is being loaded, which is -17. However this fails to load in the latest kernel. 4.13. When I rollback by kernel to 4.12 it starts to work again.

Let me know if there is any info you need from my side. It should be reproducible on Intel Dual Band Wireless AC 7260 card.

Comment 3 Emmanuel Grumbach 2017-10-02 04:30:14 UTC

The discussion on the thread isn't device dependent. If missed the fact that you are taking about 4.13. sorry.

Comment 4 Jonny Mako 2017-10-02 17:10:09 UTC

ok, thanks. I apologize if I misunderstood the thread. There seems to be a lot going on in the thread. However, it seems like the revert which is supposed to have fixed the issue made it to 4.13 rc? But I'm not seeing it, so, it is not clear to me if the issue has already been fixed or what I'm seeing is a new issue.

At any rate, let me know if you need more info.

Comment 5 Jonny Mako 2017-10-06 17:41:52 UTC

Just a quick update. This is still a problem in 4.13.4-1-ARCH

Comment 6 Luca Coelho 2017-10-13 08:38:34 UTC

To clarify, the bug in the thread Emmanuel pointed out was introduced in 4.14, so it's not the same thing.

Comment 7 Luca Coelho 2017-10-13 08:52:31 UTC

I tried to reproduce this issue with 4.13 and the same firmware, but it works fine for me:

[   10.434927] iwlwifi 0000:0b:00.0: loaded firmware version 17.459231.0 op_mode iwlmvm
[   10.434953] iwlwifi 0000:0b:00.0: Detected Intel(R) Dual Band Wireless AC 7260, REV=0x144
[   10.453584] iwlwifi 0000:0b:00.0: base HW address: 0c:8b:fd:01:2d:5e

Can you attach the full dmesg?

Also, since you can always reproduce this with 4.13, but not with 4.12, is there any chance you could bisect?

Comment 8 Jonny Mako 2017-10-14 17:13:12 UTC

I was able to load it by passing intel_iommu=off. I'm assuming this change is something by design?

Comment 9 Emmanuel Grumbach 2017-10-14 17:16:20 UTC

(In reply to Jonny Mako from comment #8)
> I was able to load it by passing intel_iommu=off. I'm assuming this change
> is something by design?

Nope. This only means that the component should be updated :)
Doing this now...

Comment 10 Jonny Mako 2017-10-20 01:05:44 UTC

ok, thanks. This is now fixed in 4.13.7-1-ARCH.

Comment 11 Adrian 2017-11-06 10:25:18 UTC

Hello,
Could you point a parch which fixes this issue ?
Current Ubuntu kernel seems to suffer this bug.