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drm/tegra: Fix vmapping of prime buffers

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The code assumes that Tegra GEM is permanently vmapped, which is not
true for the scattered buffers. After converting Tegra video decoder
driver to V4L API, we're now getting a BUG_ON from dma-buf core on playing
video using libvdpau-tegra on T30+ because tegra_gem_prime_vmap() sets
vaddr to NULL. Older pre-V4L video decoder driver wasn't vmapping dma-bufs.
Fix it by actually vmapping the exported GEMs.

Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Dmitry Osipenko 2022-06-29 01:42:39 +03:00 committed by Thierry Reding
parent b5d5288a46
commit c7860cbee9
1 changed files with 10 additions and 1 deletions
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11
drivers/gpu/drm/tegra/gem.c
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@ -704,14 +704,23 @@ static int tegra_gem_prime_vmap(struct dma_buf *buf, struct iosys_map *map)
{
struct drm_gem_object *gem = buf->priv;
struct tegra_bo *bo = to_tegra_bo(gem);
void *vaddr;
iosys_map_set_vaddr(map, bo->vaddr);
vaddr = tegra_bo_mmap(&bo->base);
if (IS_ERR(vaddr))
return PTR_ERR(vaddr);
iosys_map_set_vaddr(map, vaddr);
return 0;
}
static void tegra_gem_prime_vunmap(struct dma_buf *buf, struct iosys_map *map)
{
struct drm_gem_object *gem = buf->priv;
struct tegra_bo *bo = to_tegra_bo(gem);
tegra_bo_munmap(&bo->base, map->vaddr);
}
static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {