GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-06-23 23:21:46 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

drm/mediatek: Implement gem prime vmap/vunmap function

Browse source 
For some application which need kernel virtual address, such as fbcon,
implement these function to map/unmap kernel virtual address of prime
buffer.

Signed-off-by: CK Hu <ck.hu@mediatek.com>
This commit is contained in:
CK Hu 2019-01-14 17:36:48 +08:00
parent 9e98c678c2
commit 3df64d7b0a
3 changed files with 51 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

2
drivers/gpu/drm/mediatek/mtk_drm_drv.c
View file

@ -341,6 +341,8 @@ static struct drm_driver mtk_drm_driver = {
.gem_prime_get_sg_table = mtk_gem_prime_get_sg_table, .gem_prime_get_sg_table = mtk_gem_prime_get_sg_table,
.gem_prime_import_sg_table = mtk_gem_prime_import_sg_table, .gem_prime_import_sg_table = mtk_gem_prime_import_sg_table,
.gem_prime_mmap = mtk_drm_gem_mmap_buf, .gem_prime_mmap = mtk_drm_gem_mmap_buf,
.gem_prime_vmap = mtk_drm_gem_prime_vmap,
.gem_prime_vunmap = mtk_drm_gem_prime_vunmap,
.fops = &mtk_drm_fops, .fops = &mtk_drm_fops,
.name = DRIVER_NAME, .name = DRIVER_NAME,

46
drivers/gpu/drm/mediatek/mtk_drm_gem.c
View file

@ -241,3 +241,49 @@ err_gem_free:
kfree(mtk_gem); kfree(mtk_gem);
return ERR_PTR(ret); return ERR_PTR(ret);
} }
void *mtk_drm_gem_prime_vmap(struct drm_gem_object *obj)
{
struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
struct sg_table *sgt;
struct sg_page_iter iter;
unsigned int npages;
unsigned int i = 0;
if (mtk_gem->kvaddr)
return mtk_gem->kvaddr;
sgt = mtk_gem_prime_get_sg_table(obj);
if (IS_ERR(sgt))
return NULL;
npages = obj->size >> PAGE_SHIFT;
mtk_gem->pages = kcalloc(npages, sizeof(*mtk_gem->pages), GFP_KERNEL);
if (!mtk_gem->pages)
goto out;
for_each_sg_page(sgt->sgl, &iter, sgt->orig_nents, 0) {
mtk_gem->pages[i++] = sg_page_iter_page(&iter);
if (i > npages)
break;
}
mtk_gem->kvaddr = vmap(mtk_gem->pages, npages, VM_MAP,
pgprot_writecombine(PAGE_KERNEL));
out:
kfree((void *)sgt);
return mtk_gem->kvaddr;
}
void mtk_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
{
struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
if (!mtk_gem->pages)
return;
vunmap(vaddr);
mtk_gem->kvaddr = 0;
kfree((void *)mtk_gem->pages);
}

3
drivers/gpu/drm/mediatek/mtk_drm_gem.h
View file

@ -37,6 +37,7 @@ struct mtk_drm_gem_obj {
dma_addr_t dma_addr; dma_addr_t dma_addr;
unsigned long dma_attrs; unsigned long dma_attrs;
struct sg_table *sg; struct sg_table *sg;
struct page **pages;
}; };
#define to_mtk_gem_obj(x) container_of(x, struct mtk_drm_gem_obj, base) #define to_mtk_gem_obj(x) container_of(x, struct mtk_drm_gem_obj, base)
@ -52,5 +53,7 @@ int mtk_drm_gem_mmap_buf(struct drm_gem_object *obj,
struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj); struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj);
struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev, struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
struct dma_buf_attachment *attach, struct sg_table *sg); struct dma_buf_attachment *attach, struct sg_table *sg);
void *mtk_drm_gem_prime_vmap(struct drm_gem_object *obj);
void mtk_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
#endif #endif