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drm/mediatek: Implement gem prime vmap/vunmap function

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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
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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_import_sg_table = mtk_gem_prime_import_sg_table,
.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,
.name = DRIVER_NAME,

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

@ -241,3 +241,49 @@ err_gem_free:
kfree(mtk_gem);
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;
unsigned long dma_attrs;
struct sg_table *sg;
struct page **pages;
};
#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 drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
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