[AMD Public Use] > -----Original Message----- > From: Kai-Heng Feng <[email protected]> > Sent: Thursday, July 2, 2020 8:04 AM > To: Joerg Roedel <[email protected]> > Cc: Deucher, Alexander <[email protected]>; > [email protected]; open list <[email protected]> > Subject: [BUG] "Pre-boot DMA Protection" makes AMDGPU stop working > > Hi, > > A more detailed bug report can be found at [1]. > > I have a AMD Renoir system that can't enter graphical session because there > are many IOMMU splat. > > Alex suggested to disable "Pre-boot DMA Protection", I can confirm once it's > disabled, AMDGPU starts working with IOMMU enabled. > So raise the issue here because I have no knowledge on how to reset the > IOMMU.
+ Suravee This is part of MS's Secure Core initiative. We are investigating how to properly handle this properly on Linux. Stay tuned. Alex > > [1] > https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitla > b.freedesktop.org%2Fdrm%2Famd%2F- > %2Fissues%2F1204&data=02%7C01%7Calexander.deucher%40amd.com > %7C60746a6fecf04a5e570908d81e8011c6%7C3dd8961fe4884e608e11a82d994 > e183d%7C0%7C0%7C637292882713301680&sdata=r6cj19Vc8N0%2FSmsb > CAJva%2BabMD2b5r2lvPLIxZSacoY%3D&reserved=0 > > Kai-Heng
