From: John Hubbard <jhubbard@nvidia.com>
To: Lucas Stach <l.stach@pengutronix.de>
Cc: David Airlie <airlied@linux.ie>,
John Hubbard <jhubbard@nvidia.com>,
etnaviv@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
LKML <linux-kernel@vger.kernel.org>,
Russell King <linux+etnaviv@armlinux.org.uk>
Subject: [PATCH v2] drm/etnaviv: convert get_user_pages() --> pin_user_pages()
Date: Mon, 25 May 2020 16:49:46 -0700 [thread overview]
Message-ID: <20200525234946.512848-1-jhubbard@nvidia.com> (raw)
This code was using get_user_pages*(), in a "Case 2" scenario
(DMA/RDMA), using the categorization from [1]. That means that it's
time to convert the get_user_pages*() + put_page() calls to
pin_user_pages*() + unpin_user_pages() calls.
There is some helpful background in [2]: basically, this is a small
part of fixing a long-standing disconnect between pinning pages, and
file systems' use of those pages.
[1] Documentation/core-api/pin_user_pages.rst
[2] "Explicit pinning of user-space pages":
https://lwn.net/Articles/807108/
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
---
Hi,
Changes since v1:
* Rebased onto Linux 5.7-rc7
* Added: Lucas Stach
thanks
John Hubbard
NVIDIA
drivers/gpu/drm/etnaviv/etnaviv_gem.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
index dc9ef302f517..0f4578dc169d 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
@@ -675,10 +675,10 @@ static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj)
uint64_t ptr = userptr->ptr + pinned * PAGE_SIZE;
struct page **pages = pvec + pinned;
- ret = get_user_pages_fast(ptr, num_pages,
+ ret = pin_user_pages_fast(ptr, num_pages,
!userptr->ro ? FOLL_WRITE : 0, pages);
if (ret < 0) {
- release_pages(pvec, pinned);
+ unpin_user_pages(pvec, pinned);
kvfree(pvec);
return ret;
}
@@ -702,7 +702,7 @@ static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj)
if (etnaviv_obj->pages) {
int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
- release_pages(etnaviv_obj->pages, npages);
+ unpin_user_pages(etnaviv_obj->pages, npages);
kvfree(etnaviv_obj->pages);
}
}
--
2.26.2
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next reply other threads:[~2020-05-25 23:49 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-25 23:49 John Hubbard [this message]
2020-06-18 15:51 ` [PATCH v2] drm/etnaviv: convert get_user_pages() --> pin_user_pages() Lucas Stach
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