From: "Ruhl, Michael J" <michael.j.ruhl@intel.com>
To: Shane Francis <bigbeeshane@gmail.com>,
"dri-devel@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>
Cc: "airlied@linux.ie" <airlied@linux.ie>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"amd-gfx-request@lists.freedesktop.org"
<amd-gfx-request@lists.freedesktop.org>,
"alexander.deucher@amd.com" <alexander.deucher@amd.com>,
"christian.koenig@amd.com" <christian.koenig@amd.com>
Subject: RE: [PATCH v4 3/3] drm/radeon: fix scatter-gather mapping with user pages
Date: Wed, 25 Mar 2020 14:19:48 +0000 [thread overview]
Message-ID: <14063C7AD467DE4B82DEDB5C278E8663FFFBD48B@fmsmsx107.amr.corp.intel.com> (raw)
In-Reply-To: <20200325090741.21957-4-bigbeeshane@gmail.com>
>-----Original Message-----
>From: dri-devel <dri-devel-bounces@lists.freedesktop.org> On Behalf Of
>Shane Francis
>Sent: Wednesday, March 25, 2020 5:08 AM
>To: dri-devel@lists.freedesktop.org
>Cc: airlied@linux.ie; linux-kernel@vger.kernel.org; bigbeeshane@gmail.com;
>amd-gfx-request@lists.freedesktop.org; alexander.deucher@amd.com;
>christian.koenig@amd.com
>Subject: [PATCH v4 3/3] drm/radeon: fix scatter-gather mapping with user
>pages
>
>Calls to dma_map_sg may return segments / entries than requested
"may return less segment..." ?
^^^
>if they fall on page bounderies. The old implementation did not
>support this use case.
>
>Signed-off-by: Shane Francis <bigbeeshane@gmail.com>
>---
> drivers/gpu/drm/radeon/radeon_ttm.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c
>b/drivers/gpu/drm/radeon/radeon_ttm.c
>index 3b92311d30b9..b3380ffab4c2 100644
>--- a/drivers/gpu/drm/radeon/radeon_ttm.c
>+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
>@@ -528,7 +528,7 @@ static int radeon_ttm_tt_pin_userptr(struct ttm_tt
>*ttm)
>
> r = -ENOMEM;
> nents = dma_map_sg(rdev->dev, ttm->sg->sgl, ttm->sg->nents,
>direction);
>- if (nents != ttm->sg->nents)
>+ if (nents == 0)
> goto release_sg;
This looks correct to me.
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
M
> drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
>--
>2.26.0
>
>_______________________________________________
>dri-devel mailing list
>dri-devel@lists.freedesktop.org
>https://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2020-03-25 14:19 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-25 9:07 [PATCH v4 0/3] AMDGPU / RADEON / DRM Fix mapping of user pages Shane Francis
2020-03-25 9:07 ` [PATCH v4 1/3] drm/prime: use dma length macro when mapping sg Shane Francis
2020-03-25 13:56 ` Ruhl, Michael J
[not found] ` <CGME20200327075458eucas1p2f1011560c5d2d2a754d2394f56367ebb@eucas1p2.samsung.com>
2020-03-27 7:54 ` [v4,1/3] " Marek Szyprowski
2020-03-27 8:11 ` Christian König
2020-03-27 9:10 ` Marek Szyprowski
2020-03-30 8:18 ` Marek Szyprowski
2020-03-30 9:39 ` Shane Francis
2020-03-30 12:32 ` Shane Francis
2020-03-30 12:34 ` Shane Francis
2020-03-30 13:23 ` Alex Deucher
2020-03-31 5:25 ` Marek Szyprowski
2020-03-31 14:10 ` Alex Deucher
2020-03-31 14:29 ` Marek Szyprowski
[not found] ` <CGME20200327082702eucas1p1a66dd059480c9d02b8f0f3ab225db2c3@eucas1p1.samsung.com>
2020-03-27 8:26 ` Marek Szyprowski
2020-03-25 9:07 ` [PATCH v4 2/3] drm/amdgpu: fix scatter-gather mapping with user pages Shane Francis
2020-03-25 14:00 ` Ruhl, Michael J
2020-03-25 9:07 ` [PATCH v4 3/3] drm/radeon: " Shane Francis
2020-03-25 14:19 ` Ruhl, Michael J [this message]
2020-03-25 15:54 ` Shane Francis
2020-03-25 16:08 ` Alex Deucher
2020-03-25 13:11 ` [PATCH v4 0/3] AMDGPU / RADEON / DRM Fix mapping of " Ruhl, Michael J
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