linux-kernel - Re: [PATCH v3 04/16] misc/habana: Use FOLL

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Date:   Fri, 23 Oct 2020 11:12:52 +0200
From:   Daniel Vetter <daniel.vetter@...ll.ch>
To:     DRI Development <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     KVM list <kvm@...r.kernel.org>, Linux MM <linux-mm@...ck.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
        "open list:DMA BUFFER SHARING FRAMEWORK" 
        <linux-media@...r.kernel.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Andrew Morton <akpm@...ux-foundation.org>,
        John Hubbard <jhubbard@...dia.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Jan Kara <jack@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Oded Gabbay <oded.gabbay@...il.com>,
        Omer Shpigelman <oshpigelman@...ana.ai>,
        Ofir Bitton <obitton@...ana.ai>,
        Tomer Tayar <ttayar@...ana.ai>,
        Moti Haimovski <mhaimovski@...ana.ai>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Pawel Piskorski <ppiskorski@...ana.ai>,
        Daniel Vetter <daniel.vetter@...ll.com>
Subject: Re: [PATCH v3 04/16] misc/habana: Use FOLL_LONGTERM for userptr

Hi Oded,

Did testing on your end turn up anything, or can I put an
ack&tested-by from you on the two habana patches for the next round?

Thanks, Daniel

On Wed, Oct 21, 2020 at 10:57 AM Daniel Vetter <daniel.vetter@...ll.ch> wrote:
>
> These are persistent, not just for the duration of a dma operation.
>
> Signed-off-by: Daniel Vetter <daniel.vetter@...el.com>
> Cc: Jason Gunthorpe <jgg@...pe.ca>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: John Hubbard <jhubbard@...dia.com>
> Cc: Jérôme Glisse <jglisse@...hat.com>
> Cc: Jan Kara <jack@...e.cz>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: linux-mm@...ck.org
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-samsung-soc@...r.kernel.org
> Cc: linux-media@...r.kernel.org
> Cc: Oded Gabbay <oded.gabbay@...il.com>
> Cc: Omer Shpigelman <oshpigelman@...ana.ai>
> Cc: Ofir Bitton <obitton@...ana.ai>
> Cc: Tomer Tayar <ttayar@...ana.ai>
> Cc: Moti Haimovski <mhaimovski@...ana.ai>
> Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Pawel Piskorski <ppiskorski@...ana.ai>
> Signed-off-by: Daniel Vetter <daniel.vetter@...ll.com>
> ---
>  drivers/misc/habanalabs/common/memory.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/misc/habanalabs/common/memory.c b/drivers/misc/habanalabs/common/memory.c
> index 327b64479f97..767d3644c033 100644
> --- a/drivers/misc/habanalabs/common/memory.c
> +++ b/drivers/misc/habanalabs/common/memory.c
> @@ -1288,7 +1288,8 @@ static int get_user_memory(struct hl_device *hdev, u64 addr, u64 size,
>                 return -ENOMEM;
>         }
>
> -       rc = pin_user_pages_fast(start, npages, FOLL_FORCE | FOLL_WRITE,
> +       rc = pin_user_pages_fast(start, npages,
> +                                FOLL_FORCE | FOLL_WRITE | FOLL_LONGTERM,
>                                  userptr->pages);
>
>         if (rc != npages) {
> --
> 2.28.0
>


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