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Date: Fri, 02 Oct 2015 16:33:56 +0200
From: Heiko Stübner <heiko@...ech.de>
To: Mark Yao <mark.yao@...k-chips.com>
Cc: dri-devel@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
Daniel Kurtz <djkurtz@...omium.org>,
Philipp Zabel <p.zabel@...gutronix.de>,
Daniel Vetter <daniel@...ll.ch>,
Rob Clark <robdclark@...il.com>,
linux-arm-kernel@...ts.infradead.org,
linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
tfiga@...omium.org, sandy.huang@...k-chips.com, dkm@...k-chips.com,
zwl@...k-chips.com, xw@...k-chips.com
Subject: Re: [PATCH v2] drm/rockchip: import dma_buf to gem
Hi Mark,
Am Freitag, 26. Juni 2015, 09:27:18 schrieb Mark Yao:
> We want to display a buffer allocated by other driver, need import
> the buffer to gem.
>
> Signed-off-by: Mark Yao <mark.yao@...k-chips.com>
This looks interesting ... do you want to follow up on it?
Heiko
> ---
> 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 3962176..9001a90 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> @@ -287,6 +287,7 @@ 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 eb2282c..e8c4d4e 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"
> @@ -105,6 +106,36 @@ int rockchip_gem_mmap(struct file *filp, struct
> vm_area_struct *vma) return ret;
> }
>
> +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)
> @@ -142,11 +173,14 @@ 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);
--
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