linux-kernel - Re: [PATCH drm-next v4 00/14] [RFC] DRM GPUVA Manager & Nouveau VM

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: <67ffef18-fae4-cb84-ff75-c4eed92a8755@redhat.com>
Date:   Tue, 13 Jun 2023 16:20:41 +0200
From:   Danilo Krummrich <dakr@...hat.com>
To:     Donald Robson <Donald.Robson@...tec.com>
Cc:     "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>,
        "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>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH drm-next v4 00/14] [RFC] DRM GPUVA Manager & Nouveau
 VM_BIND UAPI

Hi Donald,

On 6/9/23 13:56, Donald Robson wrote:
> On Wed, 2023-06-07 at 00:31 +0200, Danilo Krummrich wrote:
>>
>> Christian König (1):
>>    drm: execution context for GEM buffers v4
>>
>> Danilo Krummrich (13):
>>    maple_tree: split up MA_STATE() macro
>>    drm: manager to keep track of GPUs VA mappings
> 
> I have tested the drm GPUVA manager as part of using it with our new
> driver.  The link below shows use of the drm_gpuva_sm_[un]map()
> functions.  I think this is based on the v3 patches, but I have also
> tried it locally using v4 patches.  We will be submitting this
> driver for review soon.

That's awesome - thank your for taking the effort!

> 
> https://gitlab.freedesktop.org/sarah-walker-imgtec/powervr/-/blob/dev/v3/drivers/gpu/drm/imagination/pvr_vm.c
> 
> In a previous incarnation, I used the drm_gpuva_insert() and
> drm_gpuva_remove() functions directly.  In some now abandoned work I
> used the drm_gpuva_sm_[un]map_ops_create() route.
> 
> The only problem I encountered along the way was the maple tree init
> issue already reported by Boris and fixed in v4.  One caveat - as
> our driver is a work in progress our testing is limited to certain
> Sascha Willem tests.
> 
> I did find it quite difficult to get the prealloc route with
> drm_gpuva_sm_[un]map() working.  I'm not sure to what degree this
> reflects me being a novice on matters DRM, but I did find myself
> wishing for more direction, even with Boris's help.

I'm definitely up improving the existing documentation. Anything in 
particular you think should be described in more detail?

- Danilo

> 
> Tested-by: Donald Robson <donald.robson@...tec.com>
> 
>>    drm: debugfs: provide infrastructure to dump a DRM GPU VA space
>>    drm/nouveau: new VM_BIND uapi interfaces
>>    drm/nouveau: get vmm via nouveau_cli_vmm()
>>    drm/nouveau: bo: initialize GEM GPU VA interface
>>    drm/nouveau: move usercopy helpers to nouveau_drv.h
>>    drm/nouveau: fence: separate fence alloc and emit
>>    drm/nouveau: fence: fail to emit when fence context is killed
>>    drm/nouveau: chan: provide nouveau_channel_kill()
>>    drm/nouveau: nvkm/vmm: implement raw ops to manage uvmm
>>    drm/nouveau: implement new VM_BIND uAPI
>>    drm/nouveau: debugfs: implement DRM GPU VA debugfs
>>