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

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