From: Pranjal Ramajor Asha Kanojiya <[email protected]> Add support to export BO as DMABUF to enable userspace to reuse buffers and reduce number of copy.
Signed-off-by: Pranjal Ramajor Asha Kanojiya <[email protected]> Signed-off-by: Youssef Samir <[email protected]> --- drivers/accel/qaic/qaic_data.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/drivers/accel/qaic/qaic_data.c b/drivers/accel/qaic/qaic_data.c index 797289e9d780..63248c7215d2 100644 --- a/drivers/accel/qaic/qaic_data.c +++ b/drivers/accel/qaic/qaic_data.c @@ -643,8 +643,36 @@ static void qaic_free_object(struct drm_gem_object *obj) kfree(bo); } +static struct sg_table *qaic_get_sg_table(struct drm_gem_object *obj) +{ + struct qaic_bo *bo = to_qaic_bo(obj); + struct scatterlist *sg, *sg_in; + struct sg_table *sgt, *sgt_in; + int i; + + sgt_in = bo->sgt; + + sgt = kmalloc(sizeof(*sgt), GFP_KERNEL); + if (!sgt) + return ERR_PTR(-ENOMEM); + + if (sg_alloc_table(sgt, sgt_in->orig_nents, GFP_KERNEL)) { + kfree(sgt); + return ERR_PTR(-ENOMEM); + } + + sg = sgt->sgl; + for_each_sgtable_sg(sgt_in, sg_in, i) { + memcpy(sg, sg_in, sizeof(*sg)); + sg = sg_next(sg); + } + + return sgt; +} + static const struct drm_gem_object_funcs qaic_gem_funcs = { .free = qaic_free_object, + .get_sg_table = qaic_get_sg_table, .print_info = qaic_gem_print_info, .mmap = qaic_gem_object_mmap, .vm_ops = &drm_vm_ops, -- 2.43.0
