diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/gpu/drm/udl/udl_dmabuf.c | 255 |
1 files changed, 0 insertions, 255 deletions
diff --git a/drivers/gpu/drm/udl/udl_dmabuf.c b/drivers/gpu/drm/udl/udl_dmabuf.c deleted file mode 100644 index 3108e9a9234b..000000000000 --- a/drivers/gpu/drm/udl/udl_dmabuf.c +++ /dev/null @@ -1,255 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * udl_dmabuf.c - * - * Copyright (c) 2014 The Chromium OS Authors - */ - -#include <linux/shmem_fs.h> -#include <linux/dma-buf.h> - -#include <drm/drm_prime.h> - -#include "udl_drv.h" - -struct udl_drm_dmabuf_attachment { - struct sg_table sgt; - enum dma_data_direction dir; - bool is_mapped; -}; - -static int udl_attach_dma_buf(struct dma_buf *dmabuf, - struct dma_buf_attachment *attach) -{ - struct udl_drm_dmabuf_attachment *udl_attach; - - DRM_DEBUG_PRIME("[DEV:%s] size:%zd\n", dev_name(attach->dev), - attach->dmabuf->size); - - udl_attach = kzalloc(sizeof(*udl_attach), GFP_KERNEL); - if (!udl_attach) - return -ENOMEM; - - udl_attach->dir = DMA_NONE; - attach->priv = udl_attach; - - return 0; -} - -static void udl_detach_dma_buf(struct dma_buf *dmabuf, - struct dma_buf_attachment *attach) -{ - struct udl_drm_dmabuf_attachment *udl_attach = attach->priv; - struct sg_table *sgt; - - if (!udl_attach) - return; - - DRM_DEBUG_PRIME("[DEV:%s] size:%zd\n", dev_name(attach->dev), - attach->dmabuf->size); - - sgt = &udl_attach->sgt; - - if (udl_attach->dir != DMA_NONE) - dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, - udl_attach->dir); - - sg_free_table(sgt); - kfree(udl_attach); - attach->priv = NULL; -} - -static struct sg_table *udl_map_dma_buf(struct dma_buf_attachment *attach, - enum dma_data_direction dir) -{ - struct udl_drm_dmabuf_attachment *udl_attach = attach->priv; - struct udl_gem_object *obj = to_udl_bo(attach->dmabuf->priv); - struct drm_device *dev = obj->base.dev; - struct udl_device *udl = dev->dev_private; - struct scatterlist *rd, *wr; - struct sg_table *sgt = NULL; - unsigned int i; - int page_count; - int nents, ret; - - DRM_DEBUG_PRIME("[DEV:%s] size:%zd dir=%d\n", dev_name(attach->dev), - attach->dmabuf->size, dir); - - /* just return current sgt if already requested. */ - if (udl_attach->dir == dir && udl_attach->is_mapped) - return &udl_attach->sgt; - - if (!obj->pages) { - ret = udl_gem_get_pages(obj); - if (ret) { - DRM_ERROR("failed to map pages.\n"); - return ERR_PTR(ret); - } - } - - page_count = obj->base.size / PAGE_SIZE; - obj->sg = drm_prime_pages_to_sg(obj->pages, page_count); - if (IS_ERR(obj->sg)) { - DRM_ERROR("failed to allocate sgt.\n"); - return ERR_CAST(obj->sg); - } - - sgt = &udl_attach->sgt; - - ret = sg_alloc_table(sgt, obj->sg->orig_nents, GFP_KERNEL); - if (ret) { - DRM_ERROR("failed to alloc sgt.\n"); - return ERR_PTR(-ENOMEM); - } - - mutex_lock(&udl->gem_lock); - - rd = obj->sg->sgl; - wr = sgt->sgl; - for (i = 0; i < sgt->orig_nents; ++i) { - sg_set_page(wr, sg_page(rd), rd->length, rd->offset); - rd = sg_next(rd); - wr = sg_next(wr); - } - - if (dir != DMA_NONE) { - nents = dma_map_sg(attach->dev, sgt->sgl, sgt->orig_nents, dir); - if (!nents) { - DRM_ERROR("failed to map sgl with iommu.\n"); - sg_free_table(sgt); - sgt = ERR_PTR(-EIO); - goto err_unlock; - } - } - - udl_attach->is_mapped = true; - udl_attach->dir = dir; - attach->priv = udl_attach; - -err_unlock: - mutex_unlock(&udl->gem_lock); - return sgt; -} - -static void udl_unmap_dma_buf(struct dma_buf_attachment *attach, - struct sg_table *sgt, - enum dma_data_direction dir) -{ - /* Nothing to do. */ - DRM_DEBUG_PRIME("[DEV:%s] size:%zd dir:%d\n", dev_name(attach->dev), - attach->dmabuf->size, dir); -} - -static void *udl_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num) -{ - /* TODO */ - - return NULL; -} - -static void udl_dmabuf_kunmap(struct dma_buf *dma_buf, - unsigned long page_num, void *addr) -{ - /* TODO */ -} - -static int udl_dmabuf_mmap(struct dma_buf *dma_buf, - struct vm_area_struct *vma) -{ - /* TODO */ - - return -EINVAL; -} - -static const struct dma_buf_ops udl_dmabuf_ops = { - .attach = udl_attach_dma_buf, - .detach = udl_detach_dma_buf, - .map_dma_buf = udl_map_dma_buf, - .unmap_dma_buf = udl_unmap_dma_buf, - .map = udl_dmabuf_kmap, - .unmap = udl_dmabuf_kunmap, - .mmap = udl_dmabuf_mmap, - .release = drm_gem_dmabuf_release, -}; - -struct dma_buf *udl_gem_prime_export(struct drm_gem_object *obj, int flags) -{ - DEFINE_DMA_BUF_EXPORT_INFO(exp_info); - - exp_info.ops = &udl_dmabuf_ops; - exp_info.size = obj->size; - exp_info.flags = flags; - exp_info.priv = obj; - - return drm_gem_dmabuf_export(obj->dev, &exp_info); -} - -static int udl_prime_create(struct drm_device *dev, - size_t size, - struct sg_table *sg, - struct udl_gem_object **obj_p) -{ - struct udl_gem_object *obj; - int npages; - - npages = size / PAGE_SIZE; - - *obj_p = NULL; - obj = udl_gem_alloc_object(dev, npages * PAGE_SIZE); - if (!obj) - return -ENOMEM; - - obj->sg = sg; - obj->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); - if (obj->pages == NULL) { - DRM_ERROR("obj pages is NULL %d\n", npages); - return -ENOMEM; - } - - drm_prime_sg_to_page_addr_arrays(sg, obj->pages, NULL, npages); - - *obj_p = obj; - return 0; -} - -struct drm_gem_object *udl_gem_prime_import(struct drm_device *dev, - struct dma_buf *dma_buf) -{ - struct dma_buf_attachment *attach; - struct sg_table *sg; - struct udl_gem_object *uobj; - int ret; - - /* need to attach */ - get_device(dev->dev); - attach = dma_buf_attach(dma_buf, dev->dev); - if (IS_ERR(attach)) { - put_device(dev->dev); - return ERR_CAST(attach); - } - - get_dma_buf(dma_buf); - - sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); - if (IS_ERR(sg)) { - ret = PTR_ERR(sg); - goto fail_detach; - } - - ret = udl_prime_create(dev, dma_buf->size, sg, &uobj); - if (ret) - goto fail_unmap; - - uobj->base.import_attach = attach; - uobj->flags = UDL_BO_WC; - - return &uobj->base; - -fail_unmap: - dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL); -fail_detach: - dma_buf_detach(dma_buf, attach); - dma_buf_put(dma_buf); - put_device(dev->dev); - return ERR_PTR(ret); -} |