diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_prime.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_prime.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_prime.c b/drivers/gpu/drm/nouveau/nouveau_prime.c new file mode 100644 index 00000000000..c58aab7370c --- /dev/null +++ b/drivers/gpu/drm/nouveau/nouveau_prime.c @@ -0,0 +1,163 @@ + +#include "drmP.h" +#include "drm.h" + +#include "nouveau_drv.h" +#include "nouveau_drm.h" +#include "nouveau_dma.h" + +#include <linux/dma-buf.h> + +static struct sg_table *nouveau_gem_map_dma_buf(struct dma_buf_attachment *attachment, + enum dma_data_direction dir) +{ + struct nouveau_bo *nvbo = attachment->dmabuf->priv; + struct drm_device *dev = nvbo->gem->dev; + int npages = nvbo->bo.num_pages; + struct sg_table *sg; + int nents; + + mutex_lock(&dev->struct_mutex); + sg = drm_prime_pages_to_sg(nvbo->bo.ttm->pages, npages); + nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir); + mutex_unlock(&dev->struct_mutex); + return sg; +} + +static void nouveau_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 nouveau_gem_dmabuf_release(struct dma_buf *dma_buf) +{ + struct nouveau_bo *nvbo = dma_buf->priv; + + if (nvbo->gem->export_dma_buf == dma_buf) { + nvbo->gem->export_dma_buf = NULL; + drm_gem_object_unreference_unlocked(nvbo->gem); + } +} + +static void *nouveau_gem_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num) +{ + return NULL; +} + +static void nouveau_gem_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr) +{ + +} +static void *nouveau_gem_kmap(struct dma_buf *dma_buf, unsigned long page_num) +{ + return NULL; +} + +static void nouveau_gem_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr) +{ + +} + +static const struct dma_buf_ops nouveau_dmabuf_ops = { + .map_dma_buf = nouveau_gem_map_dma_buf, + .unmap_dma_buf = nouveau_gem_unmap_dma_buf, + .release = nouveau_gem_dmabuf_release, + .kmap = nouveau_gem_kmap, + .kmap_atomic = nouveau_gem_kmap_atomic, + .kunmap = nouveau_gem_kunmap, + .kunmap_atomic = nouveau_gem_kunmap_atomic, +}; + +static int +nouveau_prime_new(struct drm_device *dev, + size_t size, + struct sg_table *sg, + struct nouveau_bo **pnvbo) +{ + struct nouveau_bo *nvbo; + u32 flags = 0; + int ret; + + flags = TTM_PL_FLAG_TT; + + ret = nouveau_bo_new(dev, size, 0, flags, 0, 0, + sg, pnvbo); + if (ret) + return ret; + nvbo = *pnvbo; + + /* we restrict allowed domains on nv50+ to only the types + * that were requested at creation time. not possibly on + * earlier chips without busting the ABI. + */ + nvbo->valid_domains = NOUVEAU_GEM_DOMAIN_GART; + nvbo->gem = drm_gem_object_alloc(dev, nvbo->bo.mem.size); + if (!nvbo->gem) { + nouveau_bo_ref(NULL, pnvbo); + return -ENOMEM; + } + + nvbo->gem->driver_private = nvbo; + return 0; +} + +struct dma_buf *nouveau_gem_prime_export(struct drm_device *dev, + struct drm_gem_object *obj, int flags) +{ + struct nouveau_bo *nvbo = nouveau_gem_object(obj); + int ret = 0; + + /* pin buffer into GTT */ + ret = nouveau_bo_pin(nvbo, TTM_PL_FLAG_TT); + if (ret) + return ERR_PTR(-EINVAL); + + return dma_buf_export(nvbo, &nouveau_dmabuf_ops, obj->size, flags); +} + +struct drm_gem_object *nouveau_gem_prime_import(struct drm_device *dev, + struct dma_buf *dma_buf) +{ + struct dma_buf_attachment *attach; + struct sg_table *sg; + struct nouveau_bo *nvbo; + int ret; + + if (dma_buf->ops == &nouveau_dmabuf_ops) { + nvbo = dma_buf->priv; + if (nvbo->gem) { + if (nvbo->gem->dev == dev) { + drm_gem_object_reference(nvbo->gem); + return nvbo->gem; + } + } + } + /* need to attach */ + attach = dma_buf_attach(dma_buf, dev->dev); + if (IS_ERR(attach)) + return ERR_PTR(PTR_ERR(attach)); + + sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); + if (IS_ERR(sg)) { + ret = PTR_ERR(sg); + goto fail_detach; + } + + ret = nouveau_prime_new(dev, dma_buf->size, sg, &nvbo); + if (ret) + goto fail_unmap; + + nvbo->gem->import_attach = attach; + + return nvbo->gem; + +fail_unmap: + dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL); +fail_detach: + dma_buf_detach(dma_buf, attach); + return ERR_PTR(ret); +} + |