[Bug 107065] "BUG: unable to handle kernel paging request at 0000000000002000" in amdgpu_vm_cpu_set_ptes at amdgpu_vm.c:921 - bugzilla-daemon

From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 107065] "BUG: unable to handle kernel paging request at 0000000000002000" in amdgpu_vm_cpu_set_ptes at amdgpu_vm.c:921
Date: Mon, 02 Jul 2018 03:11:27 +0000	[thread overview]
Message-ID: <bug-107065-502-dP3Vg1iK18@http.bugs.freedesktop.org/> (raw)
In-Reply-To: <bug-107065-502@http.bugs.freedesktop.org/>

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https://bugs.freedesktop.org/show_bug.cgi?id=107065

--- Comment #10 from Andrey Grodzovsky <andrey.grodzovsky@amd.com> ---
Created attachment 140418
  --> https://bugs.freedesktop.org/attachment.cgi?id=140418&action=edit
drm/amdgpu: Verify root PD is mapped into kernel address space.

dwagner, please try this patch. Fixes the issue for me and I observed no
suspend/resume issues.

Christian, please take a look at the patch, problem was that in
amdgpu_vm_update_directories the parent BO didn't have a kernel mapping and so
later inside amdgpu_vm_cpu_set_ptes 
pe += (unsigned long)amdgpu_bo_kptr(bo); would equal to  0000000000002000 since 
parent amdgpu_bo_kptr woudld return NULL. The parent was the root PD. 

This was still working in 67b8d5c Linus Torvalds      7 weeks ago    Linux
4.17-rc5   (tag: v4.17-rc5) but I wasn't able to exactly pinpoint which change
broke it. I am not sure my fix is the right one so please advise.

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