/* * Copyright (c) 2015 MediaTek Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include #include #include #include "mtk_drm_drv.h" #include "mtk_drm_gem.h" 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); 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_unlocked(&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; /* * 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_PFNMAP; vma->vm_pgoff = 0; ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie, mtk_gem->dma_addr, obj->size, mtk_gem->dma_attrs); return ret; } int mtk_drm_gem_mmap_buf(struct drm_gem_object *obj, struct vm_area_struct *vma) { int ret; ret = drm_gem_mmap_obj(obj, obj->size, vma); if (ret) return ret; return mtk_drm_gem_object_mmap(obj, vma); } int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma) { struct drm_gem_object *obj; int ret; ret = drm_gem_mmap(filp, vma); if (ret) return ret; obj = vma->vm_private_data; return mtk_drm_gem_object_mmap(obj, vma); } /* * 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; int ret; struct scatterlist *s; unsigned int i; dma_addr_t expected; mtk_gem = mtk_drm_gem_init(dev, attach->dmabuf->size); if (IS_ERR(mtk_gem)) return ERR_CAST(mtk_gem); expected = sg_dma_address(sg->sgl); for_each_sg(sg->sgl, s, sg->nents, i) { if (sg_dma_address(s) != expected) { DRM_ERROR("sg_table is not contiguous"); ret = -EINVAL; goto err_gem_free; } expected = sg_dma_address(s) + sg_dma_len(s); } mtk_gem->dma_addr = sg_dma_address(sg->sgl); mtk_gem->sg = sg; return &mtk_gem->base; err_gem_free: kfree(mtk_gem); return ERR_PTR(ret); }