linux-kernel - Re: xf86-video-armada via UDL [was: Re: UDL's fbdev doesn't work for user-space apps]

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Date:   Tue, 5 Dec 2017 14:47:50 +0000
From:   Alexey Brodkin <Alexey.Brodkin@...opsys.com>
To:     Jose Abreu <Jose.Abreu@...opsys.com>
CC:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "airlied@...il.com" <airlied@...il.com>,
        "airlied@...hat.com" <airlied@...hat.com>,
        "daniel.vetter@...ll.ch" <daniel.vetter@...ll.ch>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>
Subject: Re: xf86-video-armada via UDL [was: Re: UDL's fbdev doesn't work
 for user-space apps]

Hi Jose,

On Tue, 2017-12-05 at 12:26 +0000, Jose Abreu wrote:
> On 05-12-2017 11:53, Alexey Brodkin wrote:
> > 
> > 
> > From my note above about udl_drm_gem_mmap() being only used in case of Xserver
> > I barely may conclude anything. Given my lack of knowledge of DRM guts
> > especially
> > when it comes to complicated cases with DMA buffer exports/imports I cannot say
> > immediately if that's just improper implementation of
> > udl_drm_gem_mmap() or not.
> > Even though I do see some differences between implementation of file_operations->mmap()
> > callback in UDL and
> > say exynos_drm_gem_mmap() or qxl_mmap() it's not clear
> > why this and that implementation was done.
> 
> Oh, I've seen this before. This is the same thing that arcpgu
> used to do in the mmap callback! Please comment out the call to
> update_vm_cache_attr() in the mmap callback and check if it works.

Actually I did it as the first thing when I spotted it in udl_drm_gem_mmap().
But that made no difference at all :(

-Alexey