From dba5f91829aef3ab1b3bdd7933d544a397aa9af5 Mon Sep 17 00:00:00 2001 From: Pranjal Ramajor Asha Kanojiya Date: Tue, 7 Oct 2025 07:38:53 +0200 Subject: [PATCH] accel/qaic: Add support to export dmabuf fd 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 Signed-off-by: Youssef Samir Reviewed-by: Jeff Hugo Signed-off-by: Jeff Hugo Link: https://lore.kernel.org/r/20251007053853.193608-1-youssef.abdulrahman@oss.qualcomm.com --- 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 adabc4028bb26..85c155c74fca1 100644 --- a/drivers/accel/qaic/qaic_data.c +++ b/drivers/accel/qaic/qaic_data.c @@ -644,8 +644,36 @@ 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, -- 2.47.3