From: Shane Francis <bigbeeshane@gmail.com>
To: dri-devel@lists.freedesktop.org
Cc: airlied@linux.ie, bigbeeshane@gmail.com,
alexander.deucher@amd.com, christian.koenig@amd.com
Subject: [PATCH v3 2/3] drm/amdgpu: fix scatter-gather mapping with user pages
Date: Wed, 25 Mar 2020 00:24:49 +0000 [thread overview]
Message-ID: <20200325002450.5240-3-bigbeeshane@gmail.com> (raw)
In-Reply-To: <20200325002450.5240-1-bigbeeshane@gmail.com>
Calls to dma_map_sg may return segments / entries than requested
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/amd/amdgpu/amdgpu_ttm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index dee446278417..c6e9885c071f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -974,7 +974,7 @@ static int amdgpu_ttm_tt_pin_userptr(struct ttm_tt *ttm)
/* Map SG to device */
r = -ENOMEM;
nents = dma_map_sg(adev->dev, ttm->sg->sgl, ttm->sg->nents, direction);
- if (nents != ttm->sg->nents)
+ if (nents == 0)
goto release_sg;
/* convert SG to linear array of pages and dma addresses */
--
2.26.0
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next prev parent reply other threads:[~2020-03-25 0:26 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-25 0:24 [PATCH v3 0/3] AMDGPU / RADEON / DRM Fix mapping of user pages Shane Francis
2020-03-25 0:24 ` [PATCH v3 1/3] drm/prime: use length macro when mapping sgl Shane Francis
2020-03-25 7:54 ` Christian König
2020-03-25 0:24 ` Shane Francis [this message]
2020-03-25 0:24 ` [PATCH v3 3/3] drm/radeon: fix scatter-gather mapping with user pages Shane Francis
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