Re: kern/52440 (nouveau blank screen w/some cards after MSI change in 7.99.64)

["John D. Baker" <jdbaker%consolidated.net@localhost>]

The following reply was made to PR kern/52440; it has been noted by GNATS.

From: "John D. Baker" <jdbaker%consolidated.net@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: kern/52440 (nouveau blank screen w/some cards after MSI change
 in 7.99.64)
Date: Mon, 24 Dec 2018 10:23:40 -0600 (CST)

 On Mon, 24 Dec 2018, mrg%NetBSD.org@localhost wrote:
 
 > Synopsis: nouveau blank screen w/some cards after MSI change in 7.99.64
 > 
 > State-Changed-From-To: open->feedback
 > State-Changed-By: mrg%NetBSD.org@localhost
 > State-Changed-When: Mon, 24 Dec 2018 09:22:15 +0000
 > State-Changed-Why:
 > this should be working now.  can you check?  thanks.
 
 I'll see if I can test once amd64-current is buildable again...
 
 I'm concerned that there are two places where MSI/MSIX enable/disable
 are being done.  Earlier in the life of this PR, MSI/MSIX was disabled
 in:
 
   http://mail-index.netbsd.org/source-changes/2017/08/31/msg087933.html
 
 I kept a test tree which rolled the affected file back so MSI/MSIX was
 enabled.  With the recent import of newer DRMKMS code, the relevant
 portion of the "pci.h" header file was given its own "linux_pci.c" file:
 
   http://mail-index.netbsd.org/source-changes/2018/08/27/msg098447.html
 
 and I've since kept a local patch to re-enable MSI/MSIX in my test tree.
 
 I've since seen the following:
 
   http://mail-index.netbsd.org/source-changes/2018/12/19/msg101560.html
 
 disabling MSI/MSIX in "nouveau_pci.c" specifically.
 
 I suppose my test tree will need to patch this file as well to test
 MSI/MSIX on nouveau.  (As mentioned early in this PR, I have access to
 one machine which worked fine with nouveau MSI/MSIX enabled while the
 rest did not.  I have not tested recently, but will again as soon as
 I can get amd64-HEAD to build.)
 
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