From: Souptick Joarder <jrdr.linux@gmail.com>
To: alexander.deucher@amd.com, christian.koenig@amd.com,
David1.Zhou@amd.com, daniel@ffwll.ch
Cc: amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org,
Souptick Joarder <jrdr.linux@gmail.com>,
John Hubbard <jhubbard@nvidia.com>
Subject: [PATCH] drm/radeon: Convert get_user_pages() --> pin_user_pages()
Date: Wed, 27 May 2020 02:30:02 +0530 [thread overview]
Message-ID: <1590526802-3008-1-git-send-email-jrdr.linux@gmail.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() + release_pages() 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: Souptick Joarder <jrdr.linux@gmail.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Hi,
I'm compile tested this, but unable to run-time test, so any testing
help is much appriciated.
---
drivers/gpu/drm/radeon/radeon_ttm.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index 5d50c9e..e927de2 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -506,7 +506,7 @@ static int radeon_ttm_tt_pin_userptr(struct ttm_tt *ttm)
uint64_t userptr = gtt->userptr + pinned * PAGE_SIZE;
struct page **pages = ttm->pages + pinned;
- r = get_user_pages(userptr, num_pages, write ? FOLL_WRITE : 0,
+ r = pin_user_pages(userptr, num_pages, write ? FOLL_WRITE : 0,
pages, NULL);
if (r < 0)
goto release_pages;
@@ -535,7 +535,7 @@ static int radeon_ttm_tt_pin_userptr(struct ttm_tt *ttm)
kfree(ttm->sg);
release_pages:
- release_pages(ttm->pages, pinned);
+ unpin_user_pages(ttm->pages, pinned);
return r;
}
@@ -562,7 +562,7 @@ static void radeon_ttm_tt_unpin_userptr(struct ttm_tt *ttm)
set_page_dirty(page);
mark_page_accessed(page);
- put_page(page);
+ unpin_user_page(page);
}
sg_free_table(ttm->sg);
--
1.9.1
next reply other threads:[~2020-05-26 20:51 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-26 21:00 Souptick Joarder [this message]
2020-05-26 22:57 ` [PATCH] drm/radeon: Convert get_user_pages() --> pin_user_pages() John Hubbard
2020-05-27 8:48 ` Daniel Vetter
2020-05-27 8:51 ` Daniel Vetter
2020-05-27 19:07 ` John Hubbard
2020-05-29 6:49 ` Souptick Joarder
2020-05-29 7:28 ` John Hubbard
2020-06-08 19:38 ` Souptick Joarder
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