Well that is very interesting, you are the first one who reports that SME + GFX works in some way. So far we only got negative reports for that.
There is a 4.16.13 boot dmesg which has no such issue:
http://ftp.frugalware.org/pub/other/people/crazy/radeon/dmesg-radeon-SME-ON-...
With the setup as is booting 4.16.x works , while 4.17 trows the errors.
Please do the bisect if the patch I've mentioned above doesn't help.
Ok done.. bisect points to:
b468620f2a1dfdcfddfd6fa54367b8bcc1b51248 is the first bad commit commit b468620f2a1dfdcfddfd6fa54367b8bcc1b51248 Author: Christoph Hellwig hch@lst.de Date: Mon Mar 19 11:38:19 2018 +0100
iommu/amd_iommu: Use CONFIG_DMA_DIRECT_OPS=y and dma_direct_{alloc,free}()
This cleans up the code a lot by removing duplicate logic.
Tested-by: Tom Lendacky thomas.lendacky@amd.com Tested-by: Joerg Roedel jroedel@suse.de Signed-off-by: Christoph Hellwig hch@lst.de Reviewed-by: Thomas Gleixner tglx@linutronix.de Acked-by: Joerg Roedel jroedel@suse.de Cc: David Woodhouse dwmw2@infradead.org Cc: Joerg Roedel joro@8bytes.org Cc: Jon Mason jdmason@kudzu.us Cc: Konrad Rzeszutek Wilk konrad.wilk@oracle.com Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Muli Ben-Yehuda mulix@mulix.org Cc: Peter Zijlstra peterz@infradead.org Cc: iommu@lists.linux-foundation.org Link: http://lkml.kernel.org/r/20180319103826.12853-8-hch@lst.de Signed-off-by: Ingo Molnar mingo@kernel.org
I'll try to revert this once I'm home.
I can confirm reverting b468620f2a1dfdcfddfd6fa54367b8bcc1b51248 fixes that issue for me.
The GPU is working fine with SME enabled.
Now with working GPU :) I can also confirm performance is back to normal without doing any other workarounds.
The only app still acting up a bit is Firefox , just minor frame drops, but nothing to bad. ( probably an Firefox bug too )
crhomium/chrome is fine .. even with 10 tabs open , each one playing an video on youtube no glitches at all.
Desktop is also fine now, could not find anything wrong.
BR