| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright (c) 2015 MediaTek Inc. |
| */ |
| |
| #include <linux/dma-buf.h> |
| |
| #include <drm/drm.h> |
| #include <drm/drm_device.h> |
| #include <drm/drm_gem.h> |
| #include <drm/drm_gem_cma_helper.h> |
| #include <drm/drm_prime.h> |
| |
| #include "mtk_drm_drv.h" |
| #include "mtk_drm_gem.h" |
| |
| static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma); |
| |
| static const struct drm_gem_object_funcs mtk_drm_gem_object_funcs = { |
| .free = mtk_drm_gem_free_object, |
| .get_sg_table = mtk_gem_prime_get_sg_table, |
| .vmap = mtk_drm_gem_prime_vmap, |
| .vunmap = mtk_drm_gem_prime_vunmap, |
| .mmap = mtk_drm_gem_object_mmap, |
| .vm_ops = &drm_gem_cma_vm_ops, |
| }; |
| |
| static struct mtk_drm_gem_obj *mtk_drm_gem_init(struct drm_device *dev, |
| unsigned long size) |
| { |
| struct mtk_drm_gem_obj *mtk_gem_obj; |
| int ret; |
| |
| size = round_up(size, PAGE_SIZE); |
| |
| mtk_gem_obj = kzalloc(sizeof(*mtk_gem_obj), GFP_KERNEL); |
| if (!mtk_gem_obj) |
| return ERR_PTR(-ENOMEM); |
| |
| mtk_gem_obj->base.funcs = &mtk_drm_gem_object_funcs; |
| |
| ret = drm_gem_object_init(dev, &mtk_gem_obj->base, size); |
| if (ret < 0) { |
| DRM_ERROR("failed to initialize gem object\n"); |
| kfree(mtk_gem_obj); |
| return ERR_PTR(ret); |
| } |
| |
| return mtk_gem_obj; |
| } |
| |
| struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev, |
| size_t size, bool alloc_kmap) |
| { |
| struct mtk_drm_private *priv = dev->dev_private; |
| struct mtk_drm_gem_obj *mtk_gem; |
| struct drm_gem_object *obj; |
| int ret; |
| |
| mtk_gem = mtk_drm_gem_init(dev, size); |
| if (IS_ERR(mtk_gem)) |
| return ERR_CAST(mtk_gem); |
| |
| obj = &mtk_gem->base; |
| |
| mtk_gem->dma_attrs = DMA_ATTR_WRITE_COMBINE; |
| |
| if (!alloc_kmap) |
| mtk_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING; |
| |
| mtk_gem->cookie = dma_alloc_attrs(priv->dma_dev, obj->size, |
| &mtk_gem->dma_addr, GFP_KERNEL, |
| mtk_gem->dma_attrs); |
| if (!mtk_gem->cookie) { |
| DRM_ERROR("failed to allocate %zx byte dma buffer", obj->size); |
| ret = -ENOMEM; |
| goto err_gem_free; |
| } |
| |
| if (alloc_kmap) |
| mtk_gem->kvaddr = mtk_gem->cookie; |
| |
| DRM_DEBUG_DRIVER("cookie = %p dma_addr = %pad size = %zu\n", |
| mtk_gem->cookie, &mtk_gem->dma_addr, |
| size); |
| |
| return mtk_gem; |
| |
| err_gem_free: |
| drm_gem_object_release(obj); |
| kfree(mtk_gem); |
| return ERR_PTR(ret); |
| } |
| |
| void mtk_drm_gem_free_object(struct drm_gem_object *obj) |
| { |
| struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj); |
| struct mtk_drm_private *priv = obj->dev->dev_private; |
| |
| if (mtk_gem->sg) |
| drm_prime_gem_destroy(obj, mtk_gem->sg); |
| else |
| dma_free_attrs(priv->dma_dev, obj->size, mtk_gem->cookie, |
| mtk_gem->dma_addr, mtk_gem->dma_attrs); |
| |
| /* release file pointer to gem object. */ |
| drm_gem_object_release(obj); |
| |
| kfree(mtk_gem); |
| } |
| |
| int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev, |
| struct drm_mode_create_dumb *args) |
| { |
| struct mtk_drm_gem_obj *mtk_gem; |
| int ret; |
| |
| args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8); |
| args->size = args->pitch * args->height; |
| |
| mtk_gem = mtk_drm_gem_create(dev, args->size, false); |
| if (IS_ERR(mtk_gem)) |
| return PTR_ERR(mtk_gem); |
| |
| /* |
| * allocate a id of idr table where the obj is registered |
| * and handle has the id what user can see. |
| */ |
| ret = drm_gem_handle_create(file_priv, &mtk_gem->base, &args->handle); |
| if (ret) |
| goto err_handle_create; |
| |
| /* drop reference from allocate - handle holds it now. */ |
| drm_gem_object_put(&mtk_gem->base); |
| |
| return 0; |
| |
| err_handle_create: |
| mtk_drm_gem_free_object(&mtk_gem->base); |
| return ret; |
| } |
| |
| static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj, |
| struct vm_area_struct *vma) |
| |
| { |
| int ret; |
| struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj); |
| struct mtk_drm_private *priv = obj->dev->dev_private; |
| |
| /* |
| * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the |
| * whole buffer from the start. |
| */ |
| vma->vm_pgoff = 0; |
| |
| /* |
| * dma_alloc_attrs() allocated a struct page table for mtk_gem, so clear |
| * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap(). |
| */ |
| vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; |
| vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); |
| vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); |
| |
| ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie, |
| mtk_gem->dma_addr, obj->size, mtk_gem->dma_attrs); |
| if (ret) |
| drm_gem_vm_close(vma); |
| |
| return ret; |
| } |
| |
| /* |
| * Allocate a sg_table for this GEM object. |
| * Note: Both the table's contents, and the sg_table itself must be freed by |
| * the caller. |
| * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error. |
| */ |
| struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj) |
| { |
| struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj); |
| struct mtk_drm_private *priv = obj->dev->dev_private; |
| struct sg_table *sgt; |
| int ret; |
| |
| sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); |
| if (!sgt) |
| return ERR_PTR(-ENOMEM); |
| |
| ret = dma_get_sgtable_attrs(priv->dma_dev, sgt, mtk_gem->cookie, |
| mtk_gem->dma_addr, obj->size, |
| mtk_gem->dma_attrs); |
| if (ret) { |
| DRM_ERROR("failed to allocate sgt, %d\n", ret); |
| kfree(sgt); |
| return ERR_PTR(ret); |
| } |
| |
| return sgt; |
| } |
| |
| struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev, |
| struct dma_buf_attachment *attach, struct sg_table *sg) |
| { |
| struct mtk_drm_gem_obj *mtk_gem; |
| |
| /* check if the entries in the sg_table are contiguous */ |
| if (drm_prime_get_contiguous_size(sg) < attach->dmabuf->size) { |
| DRM_ERROR("sg_table is not contiguous"); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| mtk_gem = mtk_drm_gem_init(dev, attach->dmabuf->size); |
| if (IS_ERR(mtk_gem)) |
| return ERR_CAST(mtk_gem); |
| |
| mtk_gem->dma_addr = sg_dma_address(sg->sgl); |
| mtk_gem->sg = sg; |
| |
| return &mtk_gem->base; |
| } |
| |
| int mtk_drm_gem_prime_vmap(struct drm_gem_object *obj, struct dma_buf_map *map) |
| { |
| struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj); |
| struct sg_table *sgt = NULL; |
| unsigned int npages; |
| |
| if (mtk_gem->kvaddr) |
| goto out; |
| |
| sgt = mtk_gem_prime_get_sg_table(obj); |
| if (IS_ERR(sgt)) |
| return PTR_ERR(sgt); |
| |
| npages = obj->size >> PAGE_SHIFT; |
| mtk_gem->pages = kcalloc(npages, sizeof(*mtk_gem->pages), GFP_KERNEL); |
| if (!mtk_gem->pages) { |
| kfree(sgt); |
| return -ENOMEM; |
| } |
| |
| drm_prime_sg_to_page_array(sgt, mtk_gem->pages, npages); |
| |
| mtk_gem->kvaddr = vmap(mtk_gem->pages, npages, VM_MAP, |
| pgprot_writecombine(PAGE_KERNEL)); |
| |
| out: |
| kfree(sgt); |
| dma_buf_map_set_vaddr(map, mtk_gem->kvaddr); |
| |
| return 0; |
| } |
| |
| void mtk_drm_gem_prime_vunmap(struct drm_gem_object *obj, struct dma_buf_map *map) |
| { |
| struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj); |
| void *vaddr = map->vaddr; |
| |
| if (!mtk_gem->pages) |
| return; |
| |
| vunmap(vaddr); |
| mtk_gem->kvaddr = 0; |
| kfree(mtk_gem->pages); |
| } |