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

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Date:   Fri, 9 Jun 2023 11:56:07 +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>,
        "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

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.

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.

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
>