diff options
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_prime.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_prime.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_prime.c b/drivers/gpu/drm/radeon/radeon_prime.c new file mode 100644 index 00000000000..b8f835d8ecb --- /dev/null +++ b/drivers/gpu/drm/radeon/radeon_prime.c @@ -0,0 +1,176 @@ +/* + * Copyright 2012 Advanced Micro Devices, Inc. + * + * 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 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 + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) 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. + * + * based on nouveau_prime.c + * + * Authors: Alex Deucher + */ +#include "drmP.h" +#include "drm.h" + +#include "radeon.h" +#include "radeon_drm.h" + +#include <linux/dma-buf.h> + +static struct sg_table *radeon_gem_map_dma_buf(struct dma_buf_attachment *attachment, + enum dma_data_direction dir) +{ + struct radeon_bo *bo = attachment->dmabuf->priv; + struct drm_device *dev = bo->rdev->ddev; + int npages = bo->tbo.num_pages; + struct sg_table *sg; + int nents; + + mutex_lock(&dev->struct_mutex); + sg = drm_prime_pages_to_sg(bo->tbo.ttm->pages, npages); + nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir); + mutex_unlock(&dev->struct_mutex); + return sg; +} + +static void radeon_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, + struct sg_table *sg, enum dma_data_direction dir) +{ + dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir); + sg_free_table(sg); + kfree(sg); +} + +static void radeon_gem_dmabuf_release(struct dma_buf *dma_buf) +{ + struct radeon_bo *bo = dma_buf->priv; + + if (bo->gem_base.export_dma_buf == dma_buf) { + DRM_ERROR("unreference dmabuf %p\n", &bo->gem_base); + bo->gem_base.export_dma_buf = NULL; + drm_gem_object_unreference_unlocked(&bo->gem_base); + } +} + +static void *radeon_gem_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num) +{ + return NULL; +} + +static void radeon_gem_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr) +{ + +} +static void *radeon_gem_kmap(struct dma_buf *dma_buf, unsigned long page_num) +{ + return NULL; +} + +static void radeon_gem_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr) +{ + +} + +const static struct dma_buf_ops radeon_dmabuf_ops = { + .map_dma_buf = radeon_gem_map_dma_buf, + .unmap_dma_buf = radeon_gem_unmap_dma_buf, + .release = radeon_gem_dmabuf_release, + .kmap = radeon_gem_kmap, + .kmap_atomic = radeon_gem_kmap_atomic, + .kunmap = radeon_gem_kunmap, + .kunmap_atomic = radeon_gem_kunmap_atomic, +}; + +static int radeon_prime_create(struct drm_device *dev, + size_t size, + struct sg_table *sg, + struct radeon_bo **pbo) +{ + struct radeon_device *rdev = dev->dev_private; + struct radeon_bo *bo; + int ret; + + ret = radeon_bo_create(rdev, size, PAGE_SIZE, false, + RADEON_GEM_DOMAIN_GTT, sg, pbo); + if (ret) + return ret; + bo = *pbo; + bo->gem_base.driver_private = bo; + + mutex_lock(&rdev->gem.mutex); + list_add_tail(&bo->list, &rdev->gem.objects); + mutex_unlock(&rdev->gem.mutex); + + return 0; +} + +struct dma_buf *radeon_gem_prime_export(struct drm_device *dev, + struct drm_gem_object *obj, + int flags) +{ + struct radeon_bo *bo = gem_to_radeon_bo(obj); + int ret = 0; + + /* pin buffer into GTT */ + ret = radeon_bo_pin(bo, RADEON_GEM_DOMAIN_GTT, NULL); + if (ret) + return ERR_PTR(ret); + + return dma_buf_export(bo, &radeon_dmabuf_ops, obj->size, flags); +} + +struct drm_gem_object *radeon_gem_prime_import(struct drm_device *dev, + struct dma_buf *dma_buf) +{ + struct dma_buf_attachment *attach; + struct sg_table *sg; + struct radeon_bo *bo; + int ret; + + if (dma_buf->ops == &radeon_dmabuf_ops) { + bo = dma_buf->priv; + if (bo->gem_base.dev == dev) { + drm_gem_object_reference(&bo->gem_base); + return &bo->gem_base; + } + } + + /* need to attach */ + attach = dma_buf_attach(dma_buf, dev->dev); + if (IS_ERR(attach)) + return ERR_CAST(attach); + + sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); + if (IS_ERR(sg)) { + ret = PTR_ERR(sg); + goto fail_detach; + } + + ret = radeon_prime_create(dev, dma_buf->size, sg, &bo); + if (ret) + goto fail_unmap; + + bo->gem_base.import_attach = attach; + + return &bo->gem_base; + +fail_unmap: + dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL); +fail_detach: + dma_buf_detach(dma_buf, attach); + return ERR_PTR(ret); +} |