lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Wed, 8 Aug 2018 15:15:59 -0400 (EDT)
From:   Mikulas Patocka <>
To:     Ard Biesheuvel <>
cc:     Florian Weimer <>,
        Andrew Pinski <>,
        Richard Earnshaw <>,
        Ramana Radhakrishnan <>,
        Thomas Petazzoni <>,
        GNU C Library <>,
        Catalin Marinas <>,
        Will Deacon <>,
        Russell King <>,
        LKML <>,
        linux-arm-kernel <>
Subject: Re: framebuffer corruption due to overlapping stp instructions on

On Mon, 6 Aug 2018, Ard Biesheuvel wrote:

> No that works fine for me. VDPAU acceleration works as well, but it
> depends on your chromium build whether it can actually use it, I
> think? In any case, mplayer can use vdpau to play 1080p h264 without
> breaking a sweat on this system.

I didn't install the vdpau libraries and firmware. mplayer plays through 
xv and works (it can't play through vdpau). Chromium uses 
I-don't-know-what and locks up.

> Note that the VDPAU driver also relies on memory semantics, i.e., it
> may use DC ZVA (zero cacheline) instructions which are not permitted
> on device mappings. This is probably just glibc's memset() being
> invoked, but I remember hitting this on another PCIe-impaired arm64
> system with Synopsys PCIe IP

> Are you setting the pstate to auto? That helps a lot in my experience.
> I.e.,
> echo auto > /sys/kernel/debug/dri/0/pstate

I tried that, but it didn't help.


Powered by blists - more mailing lists