linux-kernel - Re: [PATCH drm-next v7 02/13] drm: manager to keep track of GPUs VA mappings

lists.openwall.net		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 linux-hardening linux-cve-announce 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]

Message-ID: <f5957892c4fb41becd7084ac93310aae3a6e091a.camel@imgtec.com>
Date:   Mon, 17 Jul 2023 10:00:32 +0000
From:   Donald Robson <Donald.Robson@...tec.com>
To:     "corbet@....net" <corbet@....net>,
        "jason@...kstrand.net" <jason@...kstrand.net>,
        "willy@...radead.org" <willy@...radead.org>,
        "christian.koenig@....com" <christian.koenig@....com>,
        "tzimmermann@...e.de" <tzimmermann@...e.de>,
        "bagasdotme@...il.com" <bagasdotme@...il.com>,
        "mripard@...nel.org" <mripard@...nel.org>,
        "matthew.brost@...el.com" <matthew.brost@...el.com>,
        "bskeggs@...hat.com" <bskeggs@...hat.com>,
        "dakr@...hat.com" <dakr@...hat.com>,
        "ogabbay@...nel.org" <ogabbay@...nel.org>,
        "boris.brezillon@...labora.com" <boris.brezillon@...labora.com>,
        "Liam.Howlett@...cle.com" <Liam.Howlett@...cle.com>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "alexdeucher@...il.com" <alexdeucher@...il.com>,
        "airlied@...il.com" <airlied@...il.com>
CC:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
        "airlied@...hat.com" <airlied@...hat.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "thomas.hellstrom@...ux.intel.com" <thomas.hellstrom@...ux.intel.com>
Subject: Re: [PATCH drm-next v7 02/13] drm: manager to keep track of GPUs VA
 mappings

Hi Danilo,
The below part of the documentation is out of date now.
Thanks,
Donald

On Thu, 2023-07-13 at 19:03 +0200, Danilo Krummrich wrote:
> 
> +
> +/**
> + * DOC: Locking
> + *
> + * Generally, the GPU VA manager does not take care of locking itself, it is
> + * the drivers responsibility to take care about locking. Drivers might want to
> + * protect the following operations: inserting, removing and iterating
> + * &drm_gpuva objects as well as generating all kinds of operations, such as
> + * split / merge or prefetch.
> + *
> + * The GPU VA manager also does not take care of the locking of the backing
> + * &drm_gem_object buffers GPU VA lists by itself; drivers are responsible to
> + * enforce mutual exclusion using either the GEMs dma_resv lock or alternatively
> + * a driver specific external lock by setting the @DRM_GPUVA_MANAGER_LOCK_EXTERN
> + * flag.
> + *
> + * For the latter, functions such as drm_gpuva_link() or drm_gpuva_unlink()
> + * contain lockdep checks to indicate locking issues. For this to work drivers
> + * must provide (in case the @DRM_GPUVA_MANAGER_LOCK_EXTERN flag is set) their
> + * external lock with drm_gpuva_manager_set_ext_lock() after initialization.
> + */
>