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Date:   Mon, 4 Nov 2019 19:10:55 +0100
From:   Daniel Vetter <daniel@ffwll.ch>
To:     Ira Weiny <ira.weiny@intel.com>
Cc:     John Hubbard <jhubbard@nvidia.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Al Viro <viro@zeniv.linux.org.uk>,
        Alex Williamson <alex.williamson@redhat.com>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        =?iso-8859-1?Q?Bj=F6rn_T=F6pel?= <bjorn.topel@intel.com>,
        Christoph Hellwig <hch@infradead.org>,
        Dan Williams <dan.j.williams@intel.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Dave Chinner <david@fromorbit.com>,
        David Airlie <airlied@linux.ie>,
        "David S . Miller" <davem@davemloft.net>, Jan Kara <jack@suse.cz>,
        Jason Gunthorpe <jgg@ziepe.ca>, Jens Axboe <axboe@kernel.dk>,
        Jonathan Corbet <corbet@lwn.net>,
        =?iso-8859-1?B?Suly9G1l?= Glisse <jglisse@redhat.com>,
        Magnus Karlsson <magnus.karlsson@intel.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Michal Hocko <mhocko@suse.com>,
        Mike Kravetz <mike.kravetz@oracle.com>,
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        Shuah Khan <shuah@kernel.org>,
        Vlastimil Babka <vbabka@suse.cz>, bpf@vger.kernel.org,
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Subject: Re: [PATCH 09/19] drm/via: set FOLL_PIN via pin_user_pages_fast()
Message-ID: <20191104181055.GP10326@phenom.ffwll.local>
Mail-Followup-To: Ira Weiny <ira.weiny@intel.com>,
        John Hubbard <jhubbard@nvidia.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Al Viro <viro@zeniv.linux.org.uk>,
        Alex Williamson <alex.williamson@redhat.com>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        =?iso-8859-1?Q?Bj=F6rn_T=F6pel?= <bjorn.topel@intel.com>,
        Christoph Hellwig <hch@infradead.org>,
        Dan Williams <dan.j.williams@intel.com>,
        Dave Chinner <david@fromorbit.com>, David Airlie <airlied@linux.ie>,
        "David S . Miller" <davem@davemloft.net>, Jan Kara <jack@suse.cz>,
        Jason Gunthorpe <jgg@ziepe.ca>, Jens Axboe <axboe@kernel.dk>,
        Jonathan Corbet <corbet@lwn.net>,
        =?iso-8859-1?B?Suly9G1l?= Glisse <jglisse@redhat.com>,
        Magnus Karlsson <magnus.karlsson@intel.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Michal Hocko <mhocko@suse.com>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Paul Mackerras <paulus@samba.org>, Shuah Khan <shuah@kernel.org>,
        Vlastimil Babka <vbabka@suse.cz>, bpf@vger.kernel.org,
        dri-devel@lists.freedesktop.org, kvm@vger.kernel.org,
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References: <20191030224930.3990755-1-jhubbard@nvidia.com>
 <20191030224930.3990755-10-jhubbard@nvidia.com>
 <20191031233628.GI14771@iweiny-DESK2.sc.intel.com>
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On Thu, Oct 31, 2019 at 04:36:28PM -0700, Ira Weiny wrote:
> On Wed, Oct 30, 2019 at 03:49:20PM -0700, John Hubbard wrote:
> > Convert drm/via to use the new pin_user_pages_fast() call, which sets
> > FOLL_PIN. Setting FOLL_PIN is now required for code that requires
> > tracking of pinned pages, and therefore for any code that calls
> > put_user_page().
> > 
> 
> Reviewed-by: Ira Weiny <ira.weiny@intel.com>

No one's touching the via driver anymore, so feel free to merge this
through whatever tree suits best (aka I'll drop this on the floor and
forget about it now).

Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>

> 
> > Signed-off-by: John Hubbard <jhubbard@nvidia.com>
> > ---
> >  drivers/gpu/drm/via/via_dmablit.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/via/via_dmablit.c b/drivers/gpu/drm/via/via_dmablit.c
> > index 3db000aacd26..37c5e572993a 100644
> > --- a/drivers/gpu/drm/via/via_dmablit.c
> > +++ b/drivers/gpu/drm/via/via_dmablit.c
> > @@ -239,7 +239,7 @@ via_lock_all_dma_pages(drm_via_sg_info_t *vsg,  drm_via_dmablit_t *xfer)
> >  	vsg->pages = vzalloc(array_size(sizeof(struct page *), vsg->num_pages));
> >  	if (NULL == vsg->pages)
> >  		return -ENOMEM;
> > -	ret = get_user_pages_fast((unsigned long)xfer->mem_addr,
> > +	ret = pin_user_pages_fast((unsigned long)xfer->mem_addr,
> >  			vsg->num_pages,
> >  			vsg->direction == DMA_FROM_DEVICE ? FOLL_WRITE : 0,
> >  			vsg->pages);
> > -- 
> > 2.23.0
> > 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch