Linux IOMMU Development
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* Any side effect if turn off amd_iommu
@ 2015-03-25  3:30 AceLan Kao
       [not found] ` <CAFv23QmxQ3vJnMEGN0TNR3vLAx1MN7ptB0y3QQLKciqfT3OBsQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
  0 siblings, 1 reply; 14+ messages in thread
From: AceLan Kao @ 2015-03-25  3:30 UTC (permalink / raw)
  To: Joerg Roedel, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA

Hi,

We have some AMD machines(AMD cpu and graphics) that need to set
amd_iommu=off to work.
Some of them have wifi issue that it can't connect to any AP(no
interrupt)(can set noapic to workaround it, too),
and some of them have graphics issues.
The only workaround we found is to set amd_iommu=off, and it fixes both issues.

I have 2 questions.
1. What kind of these issues would be, are they a driver issue or a
BIOS issue? If it's a BIOS issue, what we should tell the BIOS
engineers, so that they know how to fix it?
2. Some of the machines may not have the chance to get a BIOS update,
do you think it's okay to add a quirk in amd_iommu driver to blacklist
out those machines? Are there any side effects if we do so?
Thanks.

Beat regards,
AceLan Kao.

^ permalink raw reply	[flat|nested] 14+ messages in thread

end of thread, other threads:[~2015-05-13 13:44 UTC | newest]

Thread overview: 14+ messages (download: mbox.gz follow: Atom feed
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2015-03-25  3:30 Any side effect if turn off amd_iommu AceLan Kao
     [not found] ` <CAFv23QmxQ3vJnMEGN0TNR3vLAx1MN7ptB0y3QQLKciqfT3OBsQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-03-25 14:04   ` Joerg Roedel
     [not found]     ` <20150325140410.GS4441-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2015-03-26  2:26       ` AceLan Kao
     [not found]         ` <CAFv23Qn93z4pE6RtURgoiBADpgCWZ6gfpMPn3akfJibudRi+Qg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-03-26 12:05           ` Joerg Roedel
     [not found]             ` <20150326120547.GU4441-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2015-03-27  0:48               ` AceLan Kao
     [not found]                 ` <CAFv23QnUO+w0EXUx8DtgPx0W=fz37_R04EW6P-g+PF_y_U1dfA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-03-30 16:09                   ` Joerg Roedel
     [not found]                     ` <20150330160910.GZ4441-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2015-03-31  0:30                       ` AceLan Kao
     [not found]                         ` <CAFv23QmOjFb9NgLY0aW55OpQSecFA83jNOU1TY7o3qWuft1_Cw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-04-23  2:15                           ` AceLan Kao
     [not found]                             ` <CAFv23Q==+tXTif9uQfyTHE28hxGt80WYS=A6qN7q0Q4q7re6kw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-05-04  2:27                               ` AceLan Kao
2015-05-04 11:08                               ` Joerg Roedel
     [not found]                                 ` <20150504110802.GE15736-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2015-05-05  7:30                                   ` AceLan Kao
     [not found]                                     ` <CAFv23QkRouVJ6siu==-EjLndP2Z7inz+qVeKxLci3=R=9r8+zQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-05-05 15:13                                       ` Joerg Roedel
     [not found]                                         ` <20150505151319.GO15736-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2015-05-13  7:37                                           ` AceLan Kao
     [not found]                                             ` <CAFv23Q=iU7X1EOcZDUh6NhcnuvyyNSKUGEot6ZhCg8uZ7kRNAQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-05-13 13:44                                               ` Joerg Roedel

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