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gpu: host1x: Support DMA mapping of buffers

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If host1x_bo_pin() returns an SG table, create a DMA mapping for the
buffer. For buffers that the host1x client has already mapped itself,
host1x_bo_pin() returns NULL and the existing DMA address is used.

Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding
2019-10-28 13:37:13 +01:00
parent b78e70c04c
commit af1cbfb9bf
4 changed files with 87 additions and 24 deletions
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18
drivers/gpu/drm/tegra/gem.c
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@@ -34,9 +34,19 @@ static struct sg_table *tegra_bo_pin(struct device *dev, struct host1x_bo *bo,
struct sg_table *sgt;
int err;
if (phys)
/*
* If we've manually mapped the buffer object through the IOMMU, make
* sure to return the IOVA address of our mapping.
*/
if (phys && obj->mm) {
*phys = obj->iova;
return NULL;
}
/*
* If we don't have a mapping for this buffer yet, return an SG table
* so that host1x can do the mapping for us via the DMA API.
*/
sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
if (!sgt)
return ERR_PTR(-ENOMEM);
@@ -62,8 +72,10 @@ free:
static void tegra_bo_unpin(struct device *dev, struct sg_table *sgt)
{
sg_free_table(sgt);
kfree(sgt);
if (sgt) {
sg_free_table(sgt);
kfree(sgt);
}
}
static void *tegra_bo_mmap(struct host1x_bo *bo)