gpu: ion: Add map_dma support in IOMMU heap
IOMMU is missing support for ion_map_dma.
ION clients need support for this api.
Add functions to implement ion_map_dma and
ion_unmap_dma in the IOMMU heap.
Change-Id: If5723f0d7ec1145e9c9d8b88a42b57ab0f2c2da7
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
diff --git a/drivers/gpu/ion/ion_iommu_heap.c b/drivers/gpu/ion/ion_iommu_heap.c
index 465863b..e754496 100644
--- a/drivers/gpu/ion/ion_iommu_heap.c
+++ b/drivers/gpu/ion/ion_iommu_heap.c
@@ -290,6 +290,35 @@
return 0;
}
+static struct scatterlist *ion_iommu_heap_map_dma(struct ion_heap *heap,
+ struct ion_buffer *buffer)
+{
+ struct scatterlist *sglist = NULL;
+ if (buffer->priv_virt) {
+ struct ion_iommu_priv_data *data = buffer->priv_virt;
+ unsigned int i;
+
+ if (!data->nrpages)
+ return NULL;
+
+ sglist = vmalloc(sizeof(*sglist) * data->nrpages);
+ if (!sglist)
+ return ERR_PTR(-ENOMEM);
+
+ sg_init_table(sglist, data->nrpages);
+ for (i = 0; i < data->nrpages; ++i)
+ sg_set_page(&sglist[i], data->pages[i], PAGE_SIZE, 0);
+ }
+ return sglist;
+}
+
+static void ion_iommu_heap_unmap_dma(struct ion_heap *heap,
+ struct ion_buffer *buffer)
+{
+ if (buffer->sglist)
+ vfree(buffer->sglist);
+}
+
static struct ion_heap_ops iommu_heap_ops = {
.allocate = ion_iommu_heap_allocate,
.free = ion_iommu_heap_free,
@@ -299,6 +328,8 @@
.map_iommu = ion_iommu_heap_map_iommu,
.unmap_iommu = ion_iommu_heap_unmap_iommu,
.cache_op = ion_iommu_cache_ops,
+ .map_dma = ion_iommu_heap_map_dma,
+ .unmap_dma = ion_iommu_heap_unmap_dma,
};
struct ion_heap *ion_iommu_heap_create(struct ion_platform_heap *heap_data)