diff options
Diffstat (limited to 'drivers/gpu/drm/drm_prime.c')
| -rw-r--r-- | drivers/gpu/drm/drm_prime.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index 1bdf2b54eaf6..f546ff98a114 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -68,6 +68,7 @@ int drm_gem_prime_handle_to_fd(struct drm_device *dev, { struct drm_gem_object *obj; void *buf; + int ret; obj = drm_gem_object_lookup(dev, file_priv, handle); if (!obj) @@ -100,6 +101,17 @@ int drm_gem_prime_handle_to_fd(struct drm_device *dev, obj->export_dma_buf = buf; *prime_fd = dma_buf_fd(buf, flags); } + /* if we've exported this buffer the cheat and add it to the import list + * so we get the correct handle back + */ + ret = drm_prime_add_imported_buf_handle(&file_priv->prime, + obj->export_dma_buf, handle); + if (ret) { + drm_gem_object_unreference_unlocked(obj); + mutex_unlock(&file_priv->prime.lock); + return ret; + } + mutex_unlock(&file_priv->prime.lock); return 0; } @@ -227,6 +239,42 @@ out: } EXPORT_SYMBOL(drm_prime_pages_to_sg); +/* export an sg table into an array of pages and addresses + this is currently required by the TTM driver in order to do correct fault + handling */ +int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages, + dma_addr_t *addrs, int max_pages) +{ + unsigned count; + struct scatterlist *sg; + struct page *page; + u32 len, offset; + int pg_index; + dma_addr_t addr; + + pg_index = 0; + for_each_sg(sgt->sgl, sg, sgt->nents, count) { + len = sg->length; + offset = sg->offset; + page = sg_page(sg); + addr = sg_dma_address(sg); + + while (len > 0) { + if (WARN_ON(pg_index >= max_pages)) + return -1; + pages[pg_index] = page; + if (addrs) + addrs[pg_index] = addr; + + page++; + addr += PAGE_SIZE; + len -= PAGE_SIZE; + pg_index++; + } + } + return 0; +} +EXPORT_SYMBOL(drm_prime_sg_to_page_addr_arrays); /* helper function to cleanup a GEM/prime object */ void drm_prime_gem_destroy(struct drm_gem_object *obj, struct sg_table *sg) { |