diff options
Diffstat (limited to 'drivers/gpu/drm/mediatek/mtk_gem.c')
-rw-r--r-- | drivers/gpu/drm/mediatek/mtk_gem.c | 287 |
1 files changed, 287 insertions, 0 deletions
diff --git a/drivers/gpu/drm/mediatek/mtk_gem.c b/drivers/gpu/drm/mediatek/mtk_gem.c new file mode 100644 index 000000000000..5a82d7cf3ed0 --- /dev/null +++ b/drivers/gpu/drm/mediatek/mtk_gem.c @@ -0,0 +1,287 @@ +// 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_dma_helper.h> +#include <drm/drm_prime.h> + +#include "mtk_drm_drv.h" +#include "mtk_gem.h" + +static int mtk_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma); + +static const struct vm_operations_struct vm_ops = { + .open = drm_gem_vm_open, + .close = drm_gem_vm_close, +}; + +static const struct drm_gem_object_funcs mtk_gem_object_funcs = { + .free = mtk_gem_free_object, + .get_sg_table = mtk_gem_prime_get_sg_table, + .vmap = mtk_gem_prime_vmap, + .vunmap = mtk_gem_prime_vunmap, + .mmap = mtk_gem_object_mmap, + .vm_ops = &vm_ops, +}; + +static struct mtk_gem_obj *mtk_gem_init(struct drm_device *dev, + unsigned long size) +{ + struct mtk_gem_obj *mtk_gem_obj; + int ret; + + size = round_up(size, PAGE_SIZE); + + if (size == 0) + return ERR_PTR(-EINVAL); + + mtk_gem_obj = kzalloc(sizeof(*mtk_gem_obj), GFP_KERNEL); + if (!mtk_gem_obj) + return ERR_PTR(-ENOMEM); + + mtk_gem_obj->base.funcs = &mtk_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_gem_obj *mtk_gem_create(struct drm_device *dev, + size_t size, bool alloc_kmap) +{ + struct mtk_drm_private *priv = dev->dev_private; + struct mtk_gem_obj *mtk_gem; + struct drm_gem_object *obj; + int ret; + + mtk_gem = mtk_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_gem_free_object(struct drm_gem_object *obj) +{ + struct mtk_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_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev, + struct drm_mode_create_dumb *args) +{ + struct mtk_gem_obj *mtk_gem; + int ret; + + args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8); + + /* + * Multiply 2 variables of different types, + * for example: args->size = args->spacing * args->height; + * may cause coverity issue with unintentional overflow. + */ + args->size = args->pitch; + args->size *= args->height; + + mtk_gem = mtk_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_gem_free_object(&mtk_gem->base); + return ret; +} + +static int mtk_gem_object_mmap(struct drm_gem_object *obj, + struct vm_area_struct *vma) + +{ + int ret; + struct mtk_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(). + */ + vm_flags_set(vma, 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); + + 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_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_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_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_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map) +{ + struct mtk_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) { + sg_free_table(sgt); + 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)); + if (!mtk_gem->kvaddr) { + sg_free_table(sgt); + kfree(sgt); + kfree(mtk_gem->pages); + return -ENOMEM; + } + sg_free_table(sgt); + kfree(sgt); + +out: + iosys_map_set_vaddr(map, mtk_gem->kvaddr); + + return 0; +} + +void mtk_gem_prime_vunmap(struct drm_gem_object *obj, struct iosys_map *map) +{ + struct mtk_gem_obj *mtk_gem = to_mtk_gem_obj(obj); + void *vaddr = map->vaddr; + + if (!mtk_gem->pages) + return; + + vunmap(vaddr); + mtk_gem->kvaddr = NULL; + kfree(mtk_gem->pages); +} |