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drm/rockchip: support prime import sg table

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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>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20180130202913.28724-3-thierry.escande@collabora.com
This commit is contained in:
Haixia Shi 2018-01-30 21:28:32 +01:00 committed by Heiko Stuebner
parent b4a92d0eef
commit 6fd0bfe2f7
3 changed files with 115 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/rockchip/rockchip_drm_drv.c
View File

@ -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,

118
drivers/gpu/drm/rockchip/rockchip_drm_gem.c
View File

@ -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 @@ err_free_rk_obj:
*/
void rockchip_gem_free_object(struct drm_gem_object *obj)
{
struct rockchip_gem_object *rk_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);
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);

5
drivers/gpu/drm/rockchip/rockchip_drm_gem.h
View File

@ -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);