We want to display a buffer allocated by other driver, need import
the buffer to gem.
Signed-off-by: Mark Yao <mark.yao at rock-chips.com>
---
Changes in resend:
- rebase to this patch to newest origin/drm-next 4.3-rc5
Changes in v2:
Adviced by Russell King
- check sgt-nents == 1 when get iova from scatterlist
- remove unused dma_map_sg/dma_unmap_sg, dma_buf_map_attachment->map_dma_buf
should do the dma_map
drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 1 +
drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 40 +++++++++++++++++++++++++--
drivers/gpu/drm/rockchip/rockchip_drm_gem.h | 5 +++-
3 files changed, 42 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
index f22e1e1..ea5b19e 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -290,6 +290,7 @@ static struct drm_driver rockchip_drm_driver = {
.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
.gem_prime_import = drm_gem_prime_import,
+ .gem_prime_import_sg_table = rockchip_gem_prime_import_sg_table,
.gem_prime_export = drm_gem_prime_export,
.gem_prime_get_sg_table = rockchip_gem_prime_get_sg_table,
.gem_prime_vmap = rockchip_gem_prime_vmap,
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
index 8caea0a..1c94a30 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
@@ -18,6 +18,7 @@
#include <drm/drm_vma_manager.h>
#include <linux/dma-attrs.h>
+#include <linux/dma-buf.h>
#include "rockchip_drm_drv.h"
#include "rockchip_drm_gem.h"
@@ -103,6 +104,36 @@ int rockchip_gem_mmap(struct file *filp, struct
vm_area_struct *vma)
return rockchip_drm_gem_object_mmap(obj, vma);
}
+struct drm_gem_object *
+rockchip_gem_prime_import_sg_table(struct drm_device *drm,
+ struct dma_buf_attachment *attach,
+ struct sg_table *sgt)
+{
+ struct rockchip_gem_object *rk_obj;
+ struct drm_gem_object *obj;
+
+ /*
+ * Todo: only support continuous buffer now, plan to found a method
+ * to import non continuous with iommu.
+ */
+ if (sgt->nents != 1)
+ return ERR_PTR(-EINVAL);
+
+ rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
+ if (!rk_obj)
+ return ERR_PTR(-ENOMEM);
+
+ obj = &rk_obj->base;
+
+ drm_gem_private_object_init(drm, obj, attach->dmabuf->size);
+
+ rk_obj->dma_addr = sg_dma_address(sgt->sgl);
+ rk_obj->sgt = sgt;
+ obj->size = sg_dma_len(sgt->sgl);
+
+ return obj;
+}
+
struct rockchip_gem_object *
rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
bool alloc_kmap)
@@ -140,11 +171,14 @@ void rockchip_gem_free_object(struct drm_gem_object *obj)
{
struct rockchip_gem_object *rk_obj;
- drm_gem_free_mmap_offset(obj);
-
rk_obj = to_rockchip_obj(obj);
- rockchip_gem_free_buf(rk_obj);
+ if (obj->import_attach) {
+ drm_prime_gem_destroy(obj, rk_obj->sgt);
+ } else {
+ drm_gem_free_mmap_offset(obj);
+ rockchip_gem_free_buf(rk_obj);
+ }
kfree(rk_obj);
}
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.h
b/drivers/gpu/drm/rockchip/rockchip_drm_gem.h
index ad22618..9fd58e3 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.h
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.h
@@ -21,6 +21,7 @@ struct rockchip_gem_object {
struct drm_gem_object base;
unsigned int flags;
+ struct sg_table *sgt;
void *kvaddr;
dma_addr_t dma_addr;
struct dma_attrs dma_attrs;
@@ -28,8 +29,10 @@ struct rockchip_gem_object {
struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj);
struct drm_gem_object *
-rockchip_gem_prime_import_sg_table(struct drm_device *dev, size_t size,
+rockchip_gem_prime_import_sg_table(struct drm_device *drm,
+ struct dma_buf_attachment *attach,
struct sg_table *sgt);
+
void *rockchip_gem_prime_vmap(struct drm_gem_object *obj);
void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
--
1.7.9.5
