/* exynos_drm_dmabuf.c * * Copyright (c) 2012 Samsung Electronics Co., Ltd. * Author: Inki Dae * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. */ #include #include #include "exynos_drm_drv.h" #include "exynos_drm_gem.h" #include struct exynos_drm_dmabuf_attachment { struct sg_table sgt; enum dma_data_direction dir; }; static int exynos_gem_attach_dma_buf(struct dma_buf *dmabuf, struct device *dev, struct dma_buf_attachment *attach) { struct exynos_drm_dmabuf_attachment *exynos_attach; exynos_attach = kzalloc(sizeof(*exynos_attach), GFP_KERNEL); if (!exynos_attach) return -ENOMEM; exynos_attach->dir = DMA_NONE; attach->priv = exynos_attach; return 0; } static void exynos_gem_detach_dma_buf(struct dma_buf *dmabuf, struct dma_buf_attachment *attach) { struct exynos_drm_dmabuf_attachment *exynos_attach = attach->priv; struct sg_table *sgt; if (!exynos_attach) return; sgt = &exynos_attach->sgt; if (exynos_attach->dir != DMA_NONE) dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, exynos_attach->dir); sg_free_table(sgt); kfree(exynos_attach); attach->priv = NULL; } static struct sg_table * exynos_gem_map_dma_buf(struct dma_buf_attachment *attach, enum dma_data_direction dir) { struct exynos_drm_dmabuf_attachment *exynos_attach = attach->priv; struct exynos_drm_gem_obj *gem_obj = attach->dmabuf->priv; struct drm_device *dev = gem_obj->base.dev; struct exynos_drm_gem_buf *buf; struct scatterlist *rd, *wr; struct sg_table *sgt = NULL; unsigned int i; int nents, ret; DRM_DEBUG_PRIME("%s\n", __FILE__); if (WARN_ON(dir == DMA_NONE)) return ERR_PTR(-EINVAL); /* just return current sgt if already requested. */ if (exynos_attach->dir == dir) return &exynos_attach->sgt; /* reattaching is not allowed. */ if (WARN_ON(exynos_attach->dir != DMA_NONE)) return ERR_PTR(-EBUSY); buf = gem_obj->buffer; if (!buf) { DRM_ERROR("buffer is null.\n"); return ERR_PTR(-ENOMEM); } sgt = &exynos_attach->sgt; ret = sg_alloc_table(sgt, buf->sgt->orig_nents, GFP_KERNEL); if (ret) { DRM_ERROR("failed to alloc sgt.\n"); return ERR_PTR(-ENOMEM); } mutex_lock(&dev->struct_mutex); rd = buf->sgt->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); } nents = dma_map_sg(attach->dev, sgt->sgl, sgt->orig_nents, dir); if (!nents) { DRM_ERROR("failed to map sgl with iommu.\n"); sgt = ERR_PTR(-EIO); goto err_unlock; } exynos_attach->dir = dir; attach->priv = exynos_attach; DRM_DEBUG_PRIME("buffer size = 0x%lx\n", buf->size); err_unlock: mutex_unlock(&dev->struct_mutex); return sgt; } static void exynos_gem_unmap_dma_buf(struct dma_buf_attachment *attach, struct sg_table *sgt, enum dma_data_direction dir) { /* Nothing to do. */ } static void exynos_dmabuf_release(struct dma_buf *dmabuf) { struct exynos_drm_gem_obj *exynos_gem_obj = dmabuf->priv; DRM_DEBUG_PRIME("%s\n", __FILE__); /* * exynos_dmabuf_release() call means that file object's * f_count is 0 and it calls drm_gem_object_handle_unreference() * to drop the references that these values had been increased * at drm_prime_handle_to_fd() */ if (exynos_gem_obj->base.export_dma_buf == dmabuf) { exynos_gem_obj->base.export_dma_buf = NULL; /* * drop this gem object refcount to release allocated buffer * and resources. */ drm_gem_object_unreference_unlocked(&exynos_gem_obj->base); } } static void *exynos_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num) { /* TODO */ return NULL; } static void exynos_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr) { /* TODO */ } static void *exynos_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num) { /* TODO */ return NULL; } static void exynos_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr) { /* TODO */ } static int exynos_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma) { return -ENOTTY; } static struct dma_buf_ops exynos_dmabuf_ops = { .attach = exynos_gem_attach_dma_buf, .detach = exynos_gem_detach_dma_buf, .map_dma_buf = exynos_gem_map_dma_buf, .unmap_dma_buf = exynos_gem_unmap_dma_buf, .kmap = exynos_gem_dmabuf_kmap, .kmap_atomic = exynos_gem_dmabuf_kmap_atomic, .kunmap = exynos_gem_dmabuf_kunmap, .kunmap_atomic = exynos_gem_dmabuf_kunmap_atomic, .mmap = exynos_gem_dmabuf_mmap, .release = exynos_dmabuf_release, }; struct dma_buf *exynos_dmabuf_prime_export(struct drm_device *drm_dev, struct drm_gem_object *obj, int flags) { struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj); return dma_buf_export(exynos_gem_obj, &exynos_dmabuf_ops, exynos_gem_obj->base.size, 0600); } struct drm_gem_object *exynos_dmabuf_prime_import(struct drm_device *drm_dev, struct dma_buf *dma_buf) { struct dma_buf_attachment *attach; struct sg_table *sgt; struct scatterlist *sgl; struct exynos_drm_gem_obj *exynos_gem_obj; struct exynos_drm_gem_buf *buffer; int ret; DRM_DEBUG_PRIME("%s\n", __FILE__); /* is this one of own objects? */ if (dma_buf->ops == &exynos_dmabuf_ops) { struct drm_gem_object *obj; exynos_gem_obj = dma_buf->priv; obj = &exynos_gem_obj->base; /* is it from our device? */ if (obj->dev == drm_dev) { drm_gem_object_reference(obj); return obj; } } attach = dma_buf_attach(dma_buf, drm_dev->dev); if (IS_ERR(attach)) return ERR_PTR(-EINVAL); sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); if (IS_ERR_OR_NULL(sgt)) { ret = PTR_ERR(sgt); goto err_buf_detach; } buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); if (!buffer) { DRM_ERROR("failed to allocate exynos_drm_gem_buf.\n"); ret = -ENOMEM; goto err_unmap_attach; } exynos_gem_obj = exynos_drm_gem_init(drm_dev, dma_buf->size); if (!exynos_gem_obj) { ret = -ENOMEM; goto err_free_buffer; } sgl = sgt->sgl; buffer->size = dma_buf->size; buffer->dma_addr = sg_dma_address(sgl); if (sgt->nents == 1) { /* always physically continuous memory if sgt->nents is 1. */ exynos_gem_obj->flags |= EXYNOS_BO_CONTIG; } else { /* * this case could be CONTIG or NONCONTIG type but for now * sets NONCONTIG. * TODO. we have to find a way that exporter can notify * the type of its own buffer to importer. */ exynos_gem_obj->flags |= EXYNOS_BO_NONCONTIG; } exynos_gem_obj->buffer = buffer; buffer->sgt = sgt; exynos_gem_obj->base.import_attach = attach; DRM_DEBUG_PRIME("dma_addr = 0x%x, size = 0x%lx\n", buffer->dma_addr, buffer->size); return &exynos_gem_obj->base; err_free_buffer: kfree(buffer); buffer = NULL; err_unmap_attach: dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL); err_buf_detach: dma_buf_detach(dma_buf, attach); return ERR_PTR(ret); } MODULE_AUTHOR("Inki Dae "); MODULE_DESCRIPTION("Samsung SoC DRM DMABUF Module"); MODULE_LICENSE("GPL");