Re: [PATCH v2 02/43] drm/rockchip: support prime import sg table

[Sandy Huang <hjc@rock-chips.com>]

在 2018/1/26 21:16, Thierry Escande 写道:
> From: Haixia Shi <hshi@chromium.org>
> 
> The prime fd to handle ioctl was not used with rockchip before. Support
> was added in order to pass graphics_Gbm and to support potential uses
> within Chrome OS (e.g. zero-copy video decode, camera).
> 
> Signed-off-by: Haixia Shi <hshi@chromium.org>
> Signed-off-by: Sean Paul <seanpaul@chromium.org>
> Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
> Tested-by: Heiko Stuebner <heiko@sntech.de>
> ---
>   drivers/gpu/drm/rockchip/rockchip_drm_drv.c |   1 +
>   drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 118 ++++++++++++++++++++++++++--
>   drivers/gpu/drm/rockchip/rockchip_drm_gem.h |   5 +-
>   3 files changed, 115 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> index d85431400a0d..88084ca15115 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> @@ -230,6 +230,7 @@ static struct drm_driver rockchip_drm_driver = {
>   	.gem_prime_import	= drm_gem_prime_import,
>   	.gem_prime_export	= drm_gem_prime_export,
>   	.gem_prime_get_sg_table	= rockchip_gem_prime_get_sg_table,
> +	.gem_prime_import_sg_table	= rockchip_gem_prime_import_sg_table,
>   	.gem_prime_vmap		= rockchip_gem_prime_vmap,
>   	.gem_prime_vunmap	= rockchip_gem_prime_vunmap,
>   	.gem_prime_mmap		= rockchip_gem_mmap_buf,
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
> index 1d9655576b6e..5d52020deca1 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
> @@ -16,6 +16,8 @@
>   #include <drm/drmP.h>
>   #include <drm/drm_gem.h>
>   #include <drm/drm_vma_manager.h>
> +
> +#include <linux/dma-buf.h>
>   #include <linux/iommu.h>
>   
>   #include "rockchip_drm_drv.h"
> @@ -309,12 +311,10 @@ static void rockchip_gem_release_object(struct rockchip_gem_object *rk_obj)
>   }
>   
>   struct rockchip_gem_object *
> -	rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
> -				   bool alloc_kmap)
> +	rockchip_gem_alloc_object(struct drm_device *drm, unsigned int size)
>   {
>   	struct rockchip_gem_object *rk_obj;
>   	struct drm_gem_object *obj;
> -	int ret;
>   
>   	size = round_up(size, PAGE_SIZE);
>   
> @@ -326,6 +326,20 @@ struct rockchip_gem_object *
>   
>   	drm_gem_object_init(drm, obj, size);
>   
> +	return rk_obj;
> +}
> +
> +struct rockchip_gem_object *
> +rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
> +			   bool alloc_kmap)
> +{
> +	struct rockchip_gem_object *rk_obj;
> +	int ret;
> +
> +	rk_obj = rockchip_gem_alloc_object(drm, size);
> +	if (IS_ERR(rk_obj))
> +		return rk_obj;
> +
>   	ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
>   	if (ret)
>   		goto err_free_rk_obj;
> @@ -343,11 +357,21 @@ struct rockchip_gem_object *
>    */
>   void rockchip_gem_free_object(struct drm_gem_object *obj)
>   {
> -	struct rockchip_gem_object *rk_obj;
> -
> -	rk_obj = to_rockchip_obj(obj);
> +	struct drm_device *drm = obj->dev;
> +	struct rockchip_drm_private *private = drm->dev_private;
> +	struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
>   
> -	rockchip_gem_free_buf(rk_obj);
> +	if (obj->import_attach) {
> +		if (private->domain) {
> +			rockchip_gem_iommu_unmap(rk_obj);
> +		} else {
> +			dma_unmap_sg(drm->dev, rk_obj->sgt->sgl,
> +				     rk_obj->sgt->nents, DMA_BIDIRECTIONAL);
> +		}
> +		drm_prime_gem_destroy(obj, rk_obj->sgt);
> +	} else {
> +		rockchip_gem_free_buf(rk_obj);
> +	}
>   
>   	rockchip_gem_release_object(rk_obj);
>   }
> @@ -451,6 +475,86 @@ struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
>   	return sgt;
>   }
>   
> +static unsigned long rockchip_sg_get_contiguous_size(struct sg_table *sgt,
> +						     int count)
> +{
> +	struct scatterlist *s;
> +	dma_addr_t expected = sg_dma_address(sgt->sgl);
> +	unsigned int i;
> +	unsigned long size = 0;
> +
> +	for_each_sg(sgt->sgl, s, count, i) {
> +		if (sg_dma_address(s) != expected)
> +			break;
> +		expected = sg_dma_address(s) + sg_dma_len(s);
> +		size += sg_dma_len(s);
> +	}
> +	return size;
> +}
> +
> +static int
> +rockchip_gem_iommu_map_sg(struct drm_device *drm,
> +			  struct dma_buf_attachment *attach,
> +			  struct sg_table *sg,
> +			  struct rockchip_gem_object *rk_obj)
> +{
> +	rk_obj->sgt = sg;
> +	return rockchip_gem_iommu_map(rk_obj);
> +}
> +
> +static int
> +rockchip_gem_dma_map_sg(struct drm_device *drm,
> +			struct dma_buf_attachment *attach,
> +			struct sg_table *sg,
> +			struct rockchip_gem_object *rk_obj)
> +{
> +	int count = dma_map_sg(drm->dev, sg->sgl, sg->nents,
> +			       DMA_BIDIRECTIONAL);
> +	if (!count)
> +		return -EINVAL;
> +
> +	if (rockchip_sg_get_contiguous_size(sg, count) < attach->dmabuf->size) {
> +		DRM_ERROR("failed to map sg_table to contiguous linear address.\n");
> +		dma_unmap_sg(drm->dev, sg->sgl, sg->nents,
> +			     DMA_BIDIRECTIONAL);
> +		return -EINVAL;
> +	}
> +
> +	rk_obj->dma_addr = sg_dma_address(sg->sgl);
> +	rk_obj->sgt = sg;
> +	return 0;
> +}
> +
> +struct drm_gem_object *
> +rockchip_gem_prime_import_sg_table(struct drm_device *drm,
> +				   struct dma_buf_attachment *attach,
> +				   struct sg_table *sg)
> +{
> +	struct rockchip_drm_private *private = drm->dev_private;
> +	struct rockchip_gem_object *rk_obj;
> +	int ret;
> +
> +	rk_obj = rockchip_gem_alloc_object(drm, attach->dmabuf->size);
> +	if (IS_ERR(rk_obj))
> +		return ERR_CAST(rk_obj);
> +
> +	if (private->domain)
> +		ret = rockchip_gem_iommu_map_sg(drm, attach, sg, rk_obj);
> +	else
> +		ret = rockchip_gem_dma_map_sg(drm, attach, sg, rk_obj);
> +
> +	if (ret < 0) {
> +		DRM_ERROR("failed to import sg table: %d\n", ret);
> +		goto err_free_rk_obj;
> +	}
> +
> +	return &rk_obj->base;
> +
> +err_free_rk_obj:
> +	rockchip_gem_release_object(rk_obj);
> +	return ERR_PTR(ret);
> +}
> +
>   void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
>   {
>   	struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.h b/drivers/gpu/drm/rockchip/rockchip_drm_gem.h
> index f237375582fb..d41fa65219d2 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.h
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.h
> @@ -36,8 +36,9 @@ 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,
> -				   struct sg_table *sgt);
> +rockchip_gem_prime_import_sg_table(struct drm_device *dev,
> +				   struct dma_buf_attachment *attach,
> +				   struct sg_table *sg);
>   void *rockchip_gem_prime_vmap(struct drm_gem_object *obj);
>   void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
>   
> 

Reviewed-by: Sandy huang <hjc@rock-chips.com>