diff options
Diffstat (limited to 'drivers/staging/omapdrm/omap_gem_dmabuf.c')
-rw-r--r-- | drivers/staging/omapdrm/omap_gem_dmabuf.c | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/drivers/staging/omapdrm/omap_gem_dmabuf.c b/drivers/staging/omapdrm/omap_gem_dmabuf.c new file mode 100644 index 000000000000..2fa39e8496db --- /dev/null +++ b/drivers/staging/omapdrm/omap_gem_dmabuf.c @@ -0,0 +1,150 @@ +/* + * drivers/staging/omapdrm/omap_gem_dmabuf.c + * + * Copyright (C) 2011 Texas Instruments + * Author: Rob Clark <rob.clark@linaro.org> + * + * 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. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include "omap_drv.h" + +#include <linux/dma-buf.h> + +static struct sg_table *omap_gem_map_dma_buf( + struct dma_buf_attachment *attachment, + enum dma_data_direction dir) +{ + struct drm_gem_object *obj = attachment->dmabuf->priv; + struct sg_table *sg; + dma_addr_t paddr; + int ret; + + sg = kzalloc(sizeof(*sg), GFP_KERNEL); + if (!sg) + return ERR_PTR(-ENOMEM); + + /* camera, etc, need physically contiguous.. but we need a + * better way to know this.. + */ + ret = omap_gem_get_paddr(obj, &paddr, true); + if (ret) + goto out; + + ret = sg_alloc_table(sg, 1, GFP_KERNEL); + if (ret) + goto out; + + sg_init_table(sg->sgl, 1); + sg_dma_len(sg->sgl) = obj->size; + sg_set_page(sg->sgl, pfn_to_page(PFN_DOWN(paddr)), obj->size, 0); + sg_dma_address(sg->sgl) = paddr; + +out: + if (ret) + return ERR_PTR(ret); + return sg; +} + +static void omap_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, + struct sg_table *sg, enum dma_data_direction dir) +{ + struct drm_gem_object *obj = attachment->dmabuf->priv; + omap_gem_put_paddr(obj); + sg_free_table(sg); + kfree(sg); +} + +static void omap_gem_dmabuf_release(struct dma_buf *buffer) +{ + struct drm_gem_object *obj = buffer->priv; + /* release reference that was taken when dmabuf was exported + * in omap_gem_prime_set().. + */ + drm_gem_object_unreference_unlocked(obj); +} + + +static int omap_gem_dmabuf_begin_cpu_access(struct dma_buf *buffer, + size_t start, size_t len, enum dma_data_direction dir) +{ + struct drm_gem_object *obj = buffer->priv; + struct page **pages; + if (omap_gem_flags(obj) & OMAP_BO_TILED) { + /* TODO we would need to pin at least part of the buffer to + * get de-tiled view. For now just reject it. + */ + return -ENOMEM; + } + /* make sure we have the pages: */ + return omap_gem_get_pages(obj, &pages, true); +} + +static void omap_gem_dmabuf_end_cpu_access(struct dma_buf *buffer, + size_t start, size_t len, enum dma_data_direction dir) +{ + struct drm_gem_object *obj = buffer->priv; + omap_gem_put_pages(obj); +} + + +static void *omap_gem_dmabuf_kmap_atomic(struct dma_buf *buffer, + unsigned long page_num) +{ + struct drm_gem_object *obj = buffer->priv; + struct page **pages; + omap_gem_get_pages(obj, &pages, false); + return kmap_atomic(pages[page_num]); +} + +static void omap_gem_dmabuf_kunmap_atomic(struct dma_buf *buffer, + unsigned long page_num, void *addr) +{ + kunmap_atomic(addr); +} + +static void *omap_gem_dmabuf_kmap(struct dma_buf *buffer, + unsigned long page_num) +{ + struct drm_gem_object *obj = buffer->priv; + struct page **pages; + omap_gem_get_pages(obj, &pages, false); + return kmap(pages[page_num]); +} + +static void omap_gem_dmabuf_kunmap(struct dma_buf *buffer, + unsigned long page_num, void *addr) +{ + struct drm_gem_object *obj = buffer->priv; + struct page **pages; + omap_gem_get_pages(obj, &pages, false); + kunmap(pages[page_num]); +} + +struct dma_buf_ops omap_dmabuf_ops = { + .map_dma_buf = omap_gem_map_dma_buf, + .unmap_dma_buf = omap_gem_unmap_dma_buf, + .release = omap_gem_dmabuf_release, + .begin_cpu_access = omap_gem_dmabuf_begin_cpu_access, + .end_cpu_access = omap_gem_dmabuf_end_cpu_access, + .kmap_atomic = omap_gem_dmabuf_kmap_atomic, + .kunmap_atomic = omap_gem_dmabuf_kunmap_atomic, + .kmap = omap_gem_dmabuf_kmap, + .kunmap = omap_gem_dmabuf_kunmap, +}; + +struct dma_buf * omap_gem_prime_export(struct drm_device *dev, + struct drm_gem_object *obj, int flags) +{ + return dma_buf_export(obj, &omap_dmabuf_ops, obj->size, 0600); +} |