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 0/3] AMDGPU / RADEON / DRM Fix mapping of user pages
Date: Wed, 25 Mar 2020 13:11:11 +0000 [thread overview]
Message-ID: <14063C7AD467DE4B82DEDB5C278E8663FFFBD36E@fmsmsx107.amr.corp.intel.com> (raw)
In-Reply-To: <20200325090741.21957-1-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 0/3] AMDGPU / RADEON / DRM Fix mapping of user pages
>
>This patch set is to fix a bug in amdgpu / radeon drm that results in
>a crash when dma_map_sg combines elemnets within a scatterlist table.
s/elemnets/elements
>There are 2 shortfalls in the current kernel.
>
>1) AMDGPU / RADEON assumes that the requested and created scatterlist
> table lengths using from dma_map_sg are equal. This may not be the
> case using the newer dma-iommu implementation
>
>2) drm_prime does not fetch the length of the scatterlist
> via the correct dma macro, this can use the incorrect length
> being used (>0) in places where dma_map_sg has updated the table
> elements.
>
> The sg_dma_len macro is representative of the length of the sg item
> after dma_map_sg
>
>Example Crash :
>> [drm:amdgpu_ttm_backend_bind [amdgpu]] *ERROR* failed to pin userptr
>
>This happens in OpenCL applications, causing them to crash or hang, on
>either amdgpu-pro or ROCm OpenCL implementations
>
>I have verified this fixes the above on kernel 5.5 and 5.5rc using an
>AMD Vega 64 GPU
>
>Shane Francis (3):
> drm/prime: use dma length macro when mapping sg to arrays
> drm/amdgpu: fix scatter-gather mapping with user pages
> drm/radeon: fix scatter-gather mapping with user pages
>
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 2 +-
> drivers/gpu/drm/drm_prime.c | 2 +-
> drivers/gpu/drm/radeon/radeon_ttm.c | 2 +-
> 3 files changed, 3 insertions(+), 3 deletions(-)
>
>--
>2.26.0
>
>_______________________________________________
>dri-devel mailing list
>dri-devel@lists.freedesktop.org
>https://lists.freedesktop.org/mailman/listinfo/dri-devel
prev parent reply other threads:[~2020-03-25 13:11 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
2020-03-25 15:54 ` Shane Francis
2020-03-25 16:08 ` Alex Deucher
2020-03-25 13:11 ` Ruhl, Michael J [this message]
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