Re: [PATCH v3 04/16] misc/habana: Use FOLL_LONGTERM for userptr

From: Daniel Vetter <daniel.vetter@ffwll.ch>
To: DRI Development <dri-devel@lists.freedesktop.org>,
	LKML <linux-kernel@vger.kernel.org>
Cc: linux-s390 <linux-s390@vger.kernel.org>,
	linux-samsung-soc <linux-samsung-soc@vger.kernel.org>,
	"Jan Kara" <jack@suse.cz>, "KVM list" <kvm@vger.kernel.org>,
	"Jason Gunthorpe" <jgg@ziepe.ca>,
	"Pawel Piskorski" <ppiskorski@habana.ai>,
	"John Hubbard" <jhubbard@nvidia.com>,
	"Daniel Vetter" <daniel.vetter@ffwll.com>,
	"Ofir Bitton" <obitton@habana.ai>,
	"Linux MM" <linux-mm@kvack.org>,
	"Jérôme Glisse" <jglisse@redhat.com>,
	"Tomer Tayar" <ttayar@habana.ai>,
	"Omer Shpigelman" <oshpigelman@habana.ai>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Daniel Vetter" <daniel.vetter@intel.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Moti Haimovski" <mhaimovski@habana.ai>,
	"Dan Williams" <dan.j.williams@intel.com>,
	"Linux ARM" <linux-arm-kernel@lists.infradead.org>,
	"open list:DMA BUFFER SHARING FRAMEWORK"
	<linux-media@vger.kernel.org>
Subject: Re: [PATCH v3 04/16] misc/habana: Use FOLL_LONGTERM for userptr
Date: Fri, 23 Oct 2020 11:12:52 +0200	[thread overview]
Message-ID: <CAKMK7uE50TPNruEQv5JDX91q0DDqy-CXfbQzc48YeqPzSE96yA@mail.gmail.com> (raw)
In-Reply-To: <20201021085655.1192025-5-daniel.vetter@ffwll.ch>

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@ffwll.ch> wrote:
>
> These are persistent, not just for the duration of a dma operation.
>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> Cc: Jason Gunthorpe <jgg@ziepe.ca>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: John Hubbard <jhubbard@nvidia.com>
> Cc: Jérôme Glisse <jglisse@redhat.com>
> Cc: Jan Kara <jack@suse.cz>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Cc: linux-mm@kvack.org
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-samsung-soc@vger.kernel.org
> Cc: linux-media@vger.kernel.org
> Cc: Oded Gabbay <oded.gabbay@gmail.com>
> Cc: Omer Shpigelman <oshpigelman@habana.ai>
> Cc: Ofir Bitton <obitton@habana.ai>
> Cc: Tomer Tayar <ttayar@habana.ai>
> Cc: Moti Haimovski <mhaimovski@habana.ai>
> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Pawel Piskorski <ppiskorski@habana.ai>
> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.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
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