Re: [Intel-xe] [PATCH v5] Documentation/gpu: VM_BIND locking document

[Rodrigo Vivi <rodrigo.vivi@intel.com>]

On Tue, Nov 28, 2023 at 04:51:25PM +0100, Thomas Hellström wrote:
> On Mon, 2023-11-27 at 14:36 -0500, Rodrigo Vivi wrote:
> > On Tue, Nov 21, 2023 at 11:40:46AM +0100, Thomas Hellström wrote:
> > > Add the first version of the VM_BIND locking document which is
> > > intended to be part of the xe driver upstreaming agreement.
> > > 
> > > The document describes and discuss the locking used during exec-
> > > functions, evicton and for userptr gpu-vmas. Intention is to be
> > > using the
> > > same nomenclature as the drm-vm-bind-async.rst.
> > > 
> > > v2:
> > > - s/gvm/gpu_vm/g (Rodrigo Vivi)
> > > - Clarify the userptr seqlock with a pointer to mm/mmu_notifier.c
> > >   (Rodrigo Vivi)
> > > - Adjust commit message accordingly.
> > > - Add SPDX license header.
> > > 
> > > v3:
> > > - Large update to align with the drm_gpuvm manager locking
> > > - Add "Efficient userptr gpu_vma exec function iteration" section
> > > - Add "Locking at bind- and unbind time" section.
> > > 
> > > v4:
> > > - Fix tabs vs space errors by untabifying (Rodrigo Vivi)
> > > - Minor style fixes and typos (Rodrigo Vivi)
> > > - Clarify situations where stale GPU mappings are occurring and how
> > >   access through these mappings are blocked. (Rodrigo Vivi)
> > > - Insert into the toctree in implementation_guidelines.rst
> > > 
> > > v5:
> > > - Add a section about recoverable page-faults.
> > > - Use local references to other documentation where possible
> > >   (Bagas Sanjaya)
> > > - General documentation fixes and typos (Danilo Krummrich and
> > >   Boris Brezillon)
> > > - Improve the documentation around locks that need to be grabbed
> > > from the
> > >   dm-fence critical section (Boris Brezillon)
> > > - Add more references to the DRM GPUVM helpers (Danilo Krummrich
> > > and
> > >   Boriz Brezillon)
> > > - Update the rfc/xe.rst document.
> > > 
> > > Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> > > Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
> > 
> > First of all, with Bagas and Boris latest suggestions, already few
> > free to use:
> > 
> > Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
> > 
> > But a few minor comments below. Mostly trying to address Boris
> > feeling
> > of long sentences. However, take them with a grain of salt since I'm
> > not
> > a native english speaker. :) 
> 
> Hi, Rodrigo.
> 
> Thanks for the reviewing. I've added most but not all of the
> suggestions in v6. Regarding the comment about "zapping", that's used
> by the core mm for the process of unmapping page-table entries;
> zap_vma_ptes() etc. Merely following that, although I'm not really
> against using unmapping etc.

Perfect then. No concerns from my side.

Thanks,
Rodrigo.

> 
> /Thomas
>