linux-kernel - Re: [PATCH hmm v2 5/5] mm/hmm: remove the customizable pfn format from hmm_range

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Message-ID: <20200506161824.GG26002@ziepe.ca>
Date:   Wed, 6 May 2020 13:18:24 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Ralph Campbell <rcampbell@...dia.com>
Cc:     linux-mm@...ck.org, Alex Deucher <alexander.deucher@....com>,
        amd-gfx@...ts.freedesktop.org, Ben Skeggs <bskeggs@...hat.com>,
        Christian König <christian.koenig@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        dri-devel@...ts.freedesktop.org,
        Felix Kuehling <Felix.Kuehling@....com>,
        Christoph Hellwig <hch@....de>,
        intel-gfx@...ts.freedesktop.org,
        Jérôme Glisse <jglisse@...hat.com>,
        John Hubbard <jhubbard@...dia.com>,
        linux-kernel@...r.kernel.org,
        Niranjana Vishwanathapura <niranjana.vishwanathapura@...el.com>,
        nouveau@...ts.freedesktop.org, "Yang, Philip" <Philip.Yang@....com>
Subject: Re: [PATCH hmm v2 5/5] mm/hmm: remove the customizable pfn format
 from hmm_range_fault

On Fri, May 01, 2020 at 05:53:26PM -0700, Ralph Campbell wrote:
> > Acked-by: Felix Kuehling <Felix.Kuehling@....com>
> > Tested-by: Ralph Campbell <rcampbell@...dia.com>
> > Signed-off-by: Jason Gunthorpe <jgg@...lanox.com>
> > Signed-off-by: Christoph Hellwig <hch@....de>
> >   Documentation/vm/hmm.rst                |  26 ++--
> >   drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c |  35 ++----
> >   drivers/gpu/drm/nouveau/nouveau_dmem.c  |  27 +---
> >   drivers/gpu/drm/nouveau/nouveau_dmem.h  |   3 +-
> >   drivers/gpu/drm/nouveau/nouveau_svm.c   |  87 ++++++++-----
> >   include/linux/hmm.h                     |  99 ++++++---------
> >   mm/hmm.c                                | 160 +++++++++++-------------
> >   7 files changed, 192 insertions(+), 245 deletions(-)
> > 
> 
> ...snip...
> 
> > +static void nouveau_hmm_convert_pfn(struct nouveau_drm *drm,
> > +				    struct hmm_range *range, u64 *ioctl_addr)
> > +{
> > +	unsigned long i, npages;
> > +
> > +	/*
> > +	 * The ioctl_addr prepared here is passed through nvif_object_ioctl()
> > +	 * to an eventual DMA map in something like gp100_vmm_pgt_pfn()
> > +	 *
> > +	 * This is all just encoding the internal hmm reprensetation into a
> 
> s/reprensetation/representation/
> 
> Looks good and still tests OK with nouveau.

Got it, thanks

Jason